CN104731305B - Shutdown control circuit and the electronic product with the shutdown control circuit - Google Patents
Shutdown control circuit and the electronic product with the shutdown control circuit Download PDFInfo
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- CN104731305B CN104731305B CN201510156733.9A CN201510156733A CN104731305B CN 104731305 B CN104731305 B CN 104731305B CN 201510156733 A CN201510156733 A CN 201510156733A CN 104731305 B CN104731305 B CN 104731305B
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Abstract
The invention discloses a kind of shutdown control circuit and the electronic product with the shutdown control circuit, it is provided with electric power management circuit, system main circuit and uses the specific function circuit and starting key and complete closedown button that continuous service is required when shutting down in electronic product, one end of the starting key connects the positive pole of battery, the other end connects the Enable Pin of the first power conversion chip, when starting key is pressed, control the first power conversion chip to enable, be that system main circuit is powered；System voltage described in one end connection of the complete closedown button, other end connected system main circuit, the system main circuit is when detecting complete closedown button and pressing, export complete closedown signal control second source conversion chip out of service, the power supply of the specific function circuit is cut off, and control system main circuit shuts down.By designing total system shutdown mode, the electric quantity consumption of electronic product internal cell can be reduced to greatest extent, in the resting period of storehouse after extension electronic product charging.
Description
Technical field
It is to be related to one kind specifically the present invention relates to a kind of circuit structure design for being used to control electronic product to shut down
The shutdown control circuit of main system shutdown and total system shutdown both of which can be supported and set using this shutdown control circuit
The electronic product of meter.
Background technology
With the development of science and technology wearing electronic product is favored and widely used by increasing consumer, its institute
The function that can be realized is also increasing.Due to current wearing electronic product, universal smaller, the very light in weight of its size, this is just
The battery that this suitable electronic product is used is determined, it is all universal smaller in volume and battery capacity.
In order that consumer can directly boot up experience when taking the electronic product for the first time, production firm is in production
Product dispatch from the factory before all can give interiors of products battery preliminary filling small part electricity.Show because present many wearing electronic products have
Show the function of time, in order to ensure the accuracy of timing, current production firm, when carrying out circuit design, is all in deisgn product
The real-time timepiece chip in portion remains electric operational mode, even being in off-mode still continuous firing in electronic product,
Thus it just result in the lasting consumption of product electricity.
Because electronic product is after dispatching from the factory, get to consumer's after a very long time may be deposited in storehouse
In hand, if the overlong time of storehouse storage, it may appear that the battery power consumption of electronic product is totally, it is impossible to the problem of starting shooting, from
And cause consumer in purchase because the wish of its purchase can not be reduced normal boot-strap experience.
Therefore, the shutdown loss of wearing electronic product how is reduced as far as possible, it is ensured that at it from dispatching from the factory into consumer's hand
This period in battery electric quantity consumption it is minimum, even saved in storehouse for a long time, taken for the first time in consumer
When also can guarantee that it can complete time experience with normal boot-strap, be much generally to be faced using battery powered electronic product at present
A problem.
The content of the invention
Main system shutdown and the shutdown control of total system shutdown both of which are supported it is an object of the invention to provide a kind of
Circuit, by controlling electronic product whole system when dispatching from the factory all to shut down, it is possible thereby to reduce electronic product to greatest extent
The electric quantity consumption of internal cell, the storehouse resting period after extension electronic product charging.
In order to solve the above technical problems, the present invention is achieved using following technical scheme：
A kind of shutdown control circuit, is applied in battery powered electronic product, and electricity is provided with the electronic product
Power management circuits, system main circuit and the specific function circuit that continuous service is required when electronic product is using shutdown；Described
The first power conversion chip and supplied for the specific function circuit that promising system main circuit is powered are set in electric power management circuit
The second source conversion chip of electricity；Starting key and complete closedown button, the starting key are provided with the electronic product
One end connect battery positive pole, the other end connect the first power conversion chip Enable Pin, when starting key is pressed, control
First power conversion chip is enabled, and cell voltage is converted into system voltage, is that system main circuit is powered；The complete closedown button
The described system voltage of one end connection, other end connected system main circuit, the system main circuit detect complete closedown by
When key is pressed, output complete closedown signal control second source conversion chip is out of service, cuts off the confession of the specific function circuit
Electricity, and the shutdown of control system main circuit.
Further, main control chip and connected peripheral function circuit, institute are provided with the system main circuit
Complete closedown button is stated to be connected between battery and the main control chip；When electronic product is in start running status, if master control
Chip detects the complete closedown button and is pressed, then output complete closedown signal first controls the specific function circuit to close,
Peripheral function circuit shutdown described in its secondary control, finally controls the first power conversion chip out of service, the main electricity of cutting system
The power supply on road, realizes that total system shuts down；When electronic product is in using off-mode, if desired electronic product is controlled to be transferred to entirely
System closedown pattern, then can press described starting key and complete closedown button simultaneously, and first power conversion chip exists
Operation is enabled when starting key is pressed, is master control chip power supply；The main control chip detects complete closedown first after upper electricity operation
Whether button is pressed, if not being pressed, and judgement enters power on mode, and output control signal maintains the first power conversion chip to make
It can run, and the start operation of control system main circuit；If complete closedown button is pressed, judges to enter complete closedown pattern, do not open
Described peripheral function circuit is moved, but directly output complete closedown signal controls described second source conversion chip and specific work(
Energy circuit is out of service, realizes that total system shuts down.
In order to ensure that main control chip will not be powered off before necessary work is completed, the present invention is in the first Power convert core
The Enable Pin of piece and systematically between be connected with storage capacitor and discharge resistance, starting key and complete closedown button are pressed at the same time
Control electronic product when using complete closedown under off-mode, the storage capacitor receives electricity in a period of starting key is pressed
The electric energy of pond output is simultaneously stored, and when starting key disconnects, is discharged by discharge resistance, to postpone the first Power convert core
The time that piece is closed, so that enough run times are reserved for main control chip, to ensure that main control chip can complete complete closedown
The related work such as the output of signal and data preservation.
In order to ensure that, even if starting key disconnects, system main circuit can also be held when controlling electronic product start operation
Continuous supply of electric power, the present invention connects the Enable Pin of first power conversion chip on the negative electrode of a pair of diode component, institute
The negative electrode docking of double diode device is stated, two anodes connect one to one with described starting key and main control chip respectively；
The main control chip need control complete machine start operation when, output starting-up signal by described double diode device transmission extremely
The Enable Pin of first power conversion chip, the first power conversion chip of control persistently enables operation, to be continuously system main circuit
Power supply.
As controlling the electronic product to enter a kind of preferred design using shutdown mode, the present invention is in the electricity
Touch-screen is set on sub- product, when electronic product is in start running status, shutdown interface is transferred by operation touch-screen, led to
Crossing operation shutdown interface only controls described system main circuit to shut down, and realizes the use shutdown of electronic product.
Efficiently controlled to be realized to the operation of second source conversion chip, in making for the second source conversion chip
Energy end connects an on-off circuit, and the on-off circuit is acted when receiving the complete closedown signal of system main circuit output,
The current potential of the Enable Pin of second source conversion chip is dragged down, control second source conversion chip is out of service, cuts off specific function
The power supply of circuit and enter total system off-mode；The system main circuit is being transferred to open state from total system off-mode
When, output high level effectively enables signal to the Enable Pin of the second source conversion chip, control second source conversion core
Piece enables operation, and cell voltage is converted into the operating voltage needed for the specific function circuit, is the specific function circuit
Power, and the operating voltage of output is fed back into the Enable Pin of second source conversion chip, maintain second source conversion core
Piece continuous service, control the specific function circuit continues upper electricity operation.
It is preferred that, it is provided with a N-channel MOS pipe in the on-off circuit, the grid of the metal-oxide-semiconductor receives described complete
Off signal, the Enable Pin of drain electrode connection second source conversion chip, source ground；The institute exported by the system main circuit
Enable signal is stated to transmit to the Enable Pin of the second source conversion chip by an anti-back biased diode.
It is preferred that, the specific function circuit can be real time clock circuit, for generating clock signal and transmitting to institute
The system main circuit stated, it is possible thereby to realize the function of showing real-time clock on electronic product.
It is preferred that, starting key and the complete closedown button is preferred to use without the mechanical key for keeping function, described
Complete closedown button is preferably mounted in the shell of electronic product, is only operated with for technical staff before electronic product dispatches from the factory；And
Described starting key can be used with the shell of exposed electronic product for technical staff and domestic consumer.
Based on the structure design of above-mentioned shutdown control circuit, the invention also provides one kind uses the shutdown control circuit
The electronic product of design, the electronic product is powered using battery；Electric power management circuit is provided with the electronic product, is
System main circuit and the specific function circuit that continuous service is required when electronic product is using shutdown；In the electric power management circuit
The first power conversion chip that promising system main circuit is powered and the second source powered for the specific function circuit is set to turn
Change chip；Starting key and complete closedown button, one end connection battery of the starting key are provided with the electronic product
Positive pole, the other end connect the first power conversion chip Enable Pin, when starting key is pressed, control the first Power convert core
Piece is enabled, and cell voltage is converted into system voltage, is that system main circuit is powered；One end connection of the complete closedown button is described
System voltage, other end connected system main circuit, the system main circuit is when detecting complete closedown button and pressing, and output is complete
Off signal control second source conversion chip is out of service, cuts off the power supply of the specific function circuit, and control system master
Circuit shuts down.
Compared with prior art, advantages and positive effects of the present invention are：The present invention is complete by being designed in electronic product
System closedown function, when electronic product dispatches from the factory, can control electronic product to enter total system shutdown mode, with to greatest extent
Reduce the consumption of battery electric quantity, it is ensured that electronic product housed after charging is dispatched from the factory, even in storehouse for a long time, to
It start can also be run as usual during up in consumer's hand, complete the time experience of consumer, thereby eliminating because cannot be started up problem
The influence caused to consumer's purchase intention.Shutdown control technology proposed by the invention be especially suitable for applying battery capacity compared with
In small wearing electronic product, to extend the inventory time of the electronic product as much as possible.
It is read in conjunction with the figure after the detailed description of embodiment of the present invention, the other features and advantages of the invention will become more
Plus it is clear.
Brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of embodiment of system main circuit in shutdown control circuit proposed by the invention；
Fig. 2 is a kind of system main power circuit principle for embodiment that power supply supply is provided for system shown in Figure 1 main circuit
Figure；
Fig. 3 is the control circuit theory diagrams for controlling a kind of embodiment of system shown in Figure 2 main power circuit；
Fig. 4 is a kind of circuit theory of embodiment of specific function circuit in shutdown control circuit proposed by the invention
Figure；
Fig. 5 is a kind of power circuit principle figure for embodiment that the specific function circuit shown in Fig. 4 provides power supply supply.
Embodiment
The embodiment to the present invention is described in more detail below in conjunction with the accompanying drawings.
The present embodiment, which is directed to, uses battery powered design of electronic products power circuit, in order to reduce battery to greatest extent
The consumption of electricity, extends the storehouse resting period of the electronic product as much as possible, it is ensured that consumer is buying electron-like production
During product can normal boot-strap complete time experience, the present embodiment designs brand-new shutdown control circuit in the electronic product,
On the basis of traditional use shutdown tupe is retained, total system shutdown control model is added, by controlling electronics to produce
Circuit system Close All inside product, so as to farthest save electric energy.
Below exemplified by dressing electronic product, the particular circuit configurations of the shutdown control circuit proposed to the present embodiment
And its operation principle is described in detail.
In current most wearing electronic products, its internal system main circuit part is usually designed to can be with
Switching on and shutting down control is carried out to it by user, and for some of system specific function circuit, such as real time clock circuit, is
Ensure the accuracy of timing time, even if user performs power-off operation, this partial function circuit will not also shut down, and still hold
Reforwarding row, has thereby resulted in the lasting consumption to battery electric quantity.
The function of being realized by this part specific function circuit is in electronic product from dispatching from the factory to taking in consumer's hand
During this section may it is not necessary to, therefore in order to extend the resting period after electronic product dispatches from the factory in storehouse, the present embodiment
Propose it is a kind of control this part specific function circuit to be closed in a period of electronic product stock, and after user's use not between
The design philosophy of disconnected operation, then on the premise of ensureing that electronic product existing capability is constant, reduces product during stock
Electric quantity consumption, extend the inventory time of product.
In order to realize above-mentioned purpose of design, the present embodiment devised on electronic product starting key SW1 and complete closedown by
Key SW2, with reference to shown in Fig. 1-Fig. 3, starting key SW1 and complete closedown the button SW2, which is preferred to use, conventional at present not to be had
The mechanical key of function is kept to realize.Wherein, starting key SW1 is used to boot up electronic product control, is connected to electronics
Between the battery and system main power circuit of interiors of products.Specifically, starting key SW1 one end can be connected battery
The Enable Pin CE of the first power conversion chip U5 in positive pole VBAT, other end connected system main power circuit.First electricity
Source conversion chip U5 is used to being converted into cell voltage into the operating voltage needed for system main circuit（Hereinafter referred to as system voltage
VSYS_3V0）, it is that system main circuit is powered, specifically optional low pressure difference linear voltage regulator LDO or dc-dc realize electricity
Conversion of the cell voltage to system voltage VSYS_3V0.
The positive pole VBAT of first power conversion chip U5 input VDD connection batteries is passed through electric capacity by the present embodiment
C3 is grounded, and processing is filtered using the electric capacity C3 voltages exported to battery, to ensure to be input to the first power conversion chip U5
Voltage stabilization.By the first power conversion chip U5 output end VOUT connection system main circuits, and by designing filter capacitor
C5 ensures to be supplied to the system voltage VSYS_3V0 of system main circuit stable.
Main control chip U2 and connected peripheral function circuit are designed with system main circuit（Not shown in figure）.
In the present embodiment, the main control chip U2 can select single-chip microprocessor MCU or CPU as the control core of whole system.Due to
Starting key SW1 looses one's grip, starting key SW1 can disconnect immediately, then cause first without function is kept after user presses
Power conversion chip U5 stops enabling.In order to ensure user when pressing starting key SW1 control electronic product starts, the first electricity
Source conversion chip U5 can continue output system voltage VSYS_3V0, it is ensured that system main circuit continues upper electricity operation, the present embodiment
Design main control chip U2 enter start operational mode after, export the effective starting-up signal PWR_ON_CTL of high level, transmit to
First power conversion chip U5 Enable Pin CE, the first power conversion chip U5 of control continues to enable operation.
As a kind of decision design mode of the present embodiment, the present embodiment is devised in the control circuit of system main power source
One double diode device D2, as shown in Figure 3.Two negative electrodes docking of the double diode device D2, and turn with the first power supply
The Enable Pin CE for changing chip U5 is connected, the starting key SW1 described in double diode device D2 two anodes, one connection, separately
One connection main control chip U2 output starting-up signal PWR_ON_CTL pin, such as main control chip U2 wherein all the way
GPIO mouthfuls of P0.10.Utilize the reverse cut-off characteristics of diode component, it is ensured that believe by the enable for pressing starting key SW1 generations
Number and the starting-up signal PWR_ON_CTL that is exported by main control chip U2 the first power supply can be sent to correct flow direction and turned
Chip U5 Enable Pin CE is changed, the first power conversion chip U5 of control is lasting in a period of electronic product start operation to enable fortune
OK.
The first power conversion chip U5 Enable Pin CE and systematically between be also respectively connected with storage capacitor C4 and put
Resistance R8, as shown in Fig. 2 for the sequential of delay the first power conversion chip U5 shut-offs.The work of this partial circuit is former
Reason will be specifically described in follow-up description.
Complete closedown button SW2 is used for the whole system circuit Close All for controlling electronic product, and the present embodiment is connected
Between the first power conversion chip U5 output end VOUT and main control chip U2 wherein all the way GPIO mouthfuls of P0.28, such as Fig. 1 institutes
Show.When main control chip U2, which detects the complete closedown button SW2, to be pressed, i.e., its GPIO mouthfuls P0.28 is by low transition into height
During level, complete closedown signal RTC_LDO_SHUT is exported（Can be by main control chip U3 GPIO mouthfuls of P0.09 outputs all the way in addition）Extremely
Specific function circuit in electronic product, controls the specific function circuit to close.
In the present embodiment, the specific function circuit is preferably illustrated by taking real time clock circuit as an example, including second
The chief component such as power conversion chip U1 and real-time timepiece chip U4, with reference to shown in Fig. 4, Fig. 5.The second source conversion
Chip U1 can equally select low pressure difference linear voltage regulator LDO or dc-dc, described for cell voltage to be converted into
Operating voltage RTC_3V0 needed for real-time timepiece chip U4, is that real-time timepiece chip U4 powers.
Specifically, can be by the positive pole VBAT of second source conversion chip U1 input VDD connection batteries, and pass through
Filter capacitor C2 is grounded；By second source conversion chip U1 output end VOUT connection real-time timepiece chips U4 feeder ear VDD,
And processing is filtered to the second source conversion chip U1 operating voltage RTC_3V0 for changing output by filter capacitor C1, C7.
The second source conversion chip U1 tunnels of Enable Pin CE mono- are connected to its output end VOUT by current-limiting resistance R3, another road passes through
The switch ways ground connection of one on-off circuit, the main control chip U2 described in the control end connection of the on-off circuit, receives master control core
The complete closedown signal RTC_LDO_SHUT of piece U2 outputs.
In the present embodiment, the on-off circuit is preferred to use a simple peripheral circuit of N-channel MOS pipe Q1 cooperations and set
Meter is formed, as shown in Figure 5.N-channel MOS pipe Q1 grid is connected to main control chip U2 P0.09 pins, main control chip is received
The complete closedown signal RTC_LDO_SHUT of U2 outputs, and by configuring resistance R4 ground connection.By the source electrode of the N-channel MOS pipe Q1
Ground connection, drain electrode connection second source conversion chip U1 Enable Pin CE, or be connected to by the less resistance R5 of a resistance
Second source conversion chip U1 Enable Pin CE.When needing control real-time timepiece chip U4 to close, main control chip can be passed through
U2 exports the effective complete closedown signal RTC_LDO_SHUT of high level, then controls N-channel MOS pipe Q1 saturation conductions, drags down the
Two power conversion chip U1 Enable Pin CE current potential, control second source conversion chip U1 is out of service, and then cuts off to reality
When clock chip U4 power supply, to reach the purpose of design of control real-time timepiece chip U4 power-off shutdowns.
Certainly, the on-off circuit other can also have the component of on-off action to enter using triode, controllable silicon etc.
The specific design of row circuit, the present embodiment is not limited in above citing.
In addition, in order to which operation, the present embodiment design main control chip after real-time timepiece chip U4 closings, can be restarted
U2 is when needing the U4 starts of control real-time timepiece chip, and output enables signal RTC_LDO_EN（For example pass through main control chip U2's
GPIO mouthfuls of P0.08 outputs）, making to second source conversion chip U1 is transmitted by anti-back biased diode D105 and current-limiting resistance R1
Energy end CE, control second source conversion chip U1 enables operation, and then cell voltage is converted into needed for real-time timepiece chip U4
Operating voltage RTC_3V0, be that real-time timepiece chip U4 powers.On real-time timepiece chip U4 after electricity operation, clock signal is generated,
Via I2C buses SDA, SCL are transmitted to main control chip U2, generate present clock via main control chip U2, and pass through electronic product
On display screen output display.
With reference to the circuit structure shown in Fig. 1-Fig. 5, the operation principle to the present embodiment is specifically addressed.
Before electronic product dispatches from the factory, in order to extend the inventory time of electronic product, technical staff can operate electronic product
Into total system shutdown mode.The state being presently in for electronic product：Use off-mode or open state, this implementation
Example proposes that two kinds of control electronic products enter the mode of operation of total system shutdown mode.
If electronic product is currently in and uses off-mode（I.e. system main circuit is closed, and specific function circuit is transported
OK）, at this point it is possible to control electronic product to enter complete by the way of starting key SW1 and complete closedown button SW2 is pressed simultaneously
System closedown pattern.When starting key SW1 is pressed, after the filtered electric capacity C8 filtering of cell voltage VBAT, double diode is controlled
One of diode forward conducting in device D2, the cut-off of another diode reverse, and transmitted by the diode of conducting
To the first power conversion chip U5 Enable Pin CE, the first power conversion chip U5 of control enables operation, and is simultaneously energy storage electricity
Hold C4 chargings.First power conversion chip U5 is enabled after operation, and cell voltage VBAT is converted into system voltage VSYS_3V0 is
Main control chip U2 powers, and makes main control chip U2 start operations.After main control chip U2 starts, detect that complete closedown button SW2 is first
It is no to be pressed, if complete closedown button SW2 is not pressed, judge that requirement enters power on mode, specific control process will be follow-up
Part is described in detail.If complete closedown button SW2 is pressed, judge to require to enter total system shutdown mode.Now, master control
Chip U2 exports the effective complete closedown signal RTC_LDO_SHUT of high level, controls N-channel MOS pipe Q1 saturation conductions, drags down the
Two power conversion chip U1 Enable Pin CE current potentials, control second source conversion chip U1 is out of service.Now, due to the second electricity
Source conversion chip U1 no longer exports the operating voltage RTC_3V0 needed for real-time timepiece chip U4, therefore, and real-time timepiece chip U4 breaks
Electricity is out of service.Then, main control chip U2 enters off-mode, and the data to register, memory are preserved.Due to start
Button SW1 can disconnect after pressing and holding a period of time because technical staff looses one's grip, in order to reserve foot to main control chip U2
The enough time for being used to perform the work such as startup, output complete closedown signal RTC_LDO_SHUT and progress data preservation, this reality
Master control core can be met by the way of suitably adjustment storage capacitor C4 capacitance and discharge resistance R8 resistance by applying example
The requirement of piece U2 working times.That is, after starting key SW1 disconnects, storage capacitor C4 is discharged by discharge resistance R8.In energy storage
In a period of electric capacity C4 discharges, the first power conversion chip U5 Enable Pin CE can still keep high level effective status, so that
Maintain the first power conversion chip U5 to continue to enable operation, be that main control chip U2 powers.At the end of storage capacitor C4 discharges, the
One power conversion chip U5 Enable Pin CE current potential step-downs, the first power conversion chip U5 is out of service, cuts off to main control chip
U2 power supply, and then main control chip shutdown is controlled, thus just realize total system shut-off function.
, now can be using the side for pressing complete closedown button SW2 if electronic product is currently in start running status
Formula come control electronic product enter total system shutdown mode.When complete closedown button SW2 is pressed, pass through the first Power convert core
The system voltage VSYS_3V0 of piece U5 conversion outputs is transmitted to main control chip U2 P0.28 via the complete closedown button SW2 of closure
Pin.Main control chip U2 judges to require to enter total system shutdown mode when the current potential for detecting its P0.28 pin is uprised.This
When, main control chip U2 exports complete closedown signal RTC_LDO_SHUT, control second source conversion chip U1 and real-time clock first
Chip U4 is out of service；Secondly, connected peripheral function circuit shutdown is controlled；Then, main control chip U2 is output it
Starting-up signal PWR_ON_CTL is set to low level, and now storage capacitor C4 is discharged by discharge resistance R8, and the first power supply of control turns
Chip U5 is changed to close after the RC times are maintained.In a period of storage capacitor C4 discharges, main control chip U2 is to register, memory
Data preserved, when the first power conversion chip U5 is closed, total system enters shutdown mode.
After electronic product enters total system shutdown mode, due to not any electric quantity consumption, therefore electronics can be ensured
Product is deposited for a long time in storehouse.
When electronic product is sold into consumer's hand for the first time, starting key SW1 control electronic products can be pressed and opened
Machine is run.When starting key SW1 is pressed, control the first power conversion chip U5 to enable first with cell voltage VBAT and transport
OK, it is that system main circuit is powered.After after electricity operation on main control chip U2, the starting-up signal PWR_ON_CTL of high level is exported, is led to
Cross double diode device D2 to transmit to the first power conversion chip U5 Enable Pin CE, even if making the first power conversion chip U5 exist
Starting key SW1 can also continue to enable operation after disconnecting, and powered always for system main circuit, realize auto-lock function.Then, master control
Chip U2 exports the enable signal RTC_LDO_EN of high level, and the is acted on by anti-back biased diode D106 and current-limiting resistance R1
Two power conversion chip U1 Enable Pin CE, control second source conversion chip U1 enable operation, output real-time timepiece chip U4
Electricity operation on required operating voltage RTC_3V0, control real-time timepiece chip U4.Enable and run in second source conversion chip U1
Afterwards, the operating voltage RTC_3V0 exported by second source conversion chip U1 is acted on second via current-limiting resistance R3 simultaneously
Power conversion chip U1 Enable Pin CE, thus one, even powered off in main control chip U2 and no longer export the enable of high level
During signal RTC_LDO_EN, the operating voltage RTC_3V0 that can be also exported using second source conversion chip U1 itself maintains second
Power conversion chip U1 enables operation always, and then ensures that real-time timepiece chip U4 can be protected under start and using off-mode
Hold running status, it is ensured that the accuracy of timing.
It is real after once adjusting when consumer starts the electronic product for the first time, it is necessary to be adjusted to system clock
When clock chip U4 can add up timing time automatically, it is ensured that the accurate display of system clock in the future.Main control chip U2 is special in control
Determine after functional circuit startup optimization, output control signal controls connected peripheral function circuit start operation, completes product
Start.
After consumer performs a starting up to the electronic product, if consumer, which is not desired to use, needs shutdown,
It can be made by operating the touch-screen of electronic product to transfer out shutdown interface by operating shutdown Interface Control electronic product to enter
Use off-mode.Off-mode is used when electronic product needs to enter because user operates, or because of the not enough automatic pass of battery electric quantity
During machine, main control chip U2 controls connected peripheral function circuit to shut down first, and then putting starting-up signal PWR_ON_CTL is
Low level, stops providing effective enable signal to the first power conversion chip U5.Then, main control chip U2 enters shutdown shape
State, the data to register, memory are preserved, and after storage capacitor C4 electric discharges terminate, the first power conversion chip U5 stops
Only run, the power supply of cutting system main circuit, system main circuit is out of service, electronic product, which enters, uses off-mode.Now,
Because second source conversion chip U1 and real-time timepiece chip U4 are still in operation, therefore when can ensure to start shooting again, clock shows
The accuracy shown, is required for resetting the time without start every time.
When needing to turn back on after consumer shuts down, starting key SW1 need to be only pressed, the first power conversion chip is controlled
U5 enables operation, is that system main circuit is powered.After main control chip U2 starts, starting-up signal PWR_ON_CTL is drawn high, the is completed
One power conversion chip U5 self-locking, then controls connected peripheral function circuit start operation, completes electronic product
Starting up.
The crowd being applicable in view of different shutdown modes is different, and control function is shut down simultaneously for the total system of electronic product
Unsuitable ordinary consumer is used, therefore, and complete closedown button SW2 is preferably arranged on the inside of electronic product, example by the present embodiment
The inside of product casing is such as built in, to avoid consumer from touching operation.And starting key SW1 is then preferably provided at electronic product
Shell on, or using on shell perforate it is exposed by the way of, to facilitate consumer to operate.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the those of ordinary skill in domain is made in the essential scope of the present invention, should also belong to this hair
Bright protection domain.
Claims (10)
1. a kind of shutdown control circuit, is applied in battery powered electronic product, power supply is provided with the electronic product
Manage circuit, system main circuit and use the specific function circuit that continuous service is required when shutting down in electronic product；Its feature exists
In：The first power conversion chip and be the specific work(that promising system main circuit is powered are set in the electric power management circuit
The second source conversion chip that energy circuit is powered；Starting key and complete closedown button are provided with the electronic product, it is described
One end of starting key connects the positive pole of battery, and the other end connects the Enable Pin of the first power conversion chip, pressed in starting key
When lower, the first power conversion chip of control is enabled, and cell voltage is converted into system voltage, is that system main circuit is powered；It is described
System voltage described in one end connection of complete closedown button, other end connected system main circuit, the system main circuit is in detection
When being pressed to complete closedown button, output complete closedown signal control second source conversion chip is out of service, cuts off the specific work(
The power supply of energy circuit, and the shutdown of control system main circuit；
When electronic product is in using off-mode, if desired electronic product is controlled to be transferred to total system shutdown mode, then simultaneously
Described starting key and complete closedown button is pressed, first power conversion chip enables operation when starting key is pressed,
Powered for system main circuit；The system main circuit it is upper electricity operation after detect whether complete closedown button is pressed first, if not by
Press, then judge to enter power on mode, output control signal maintains the first power conversion chip to enable operation, and control system master
Circuit start operation；If complete closedown button is pressed, judge to enter complete closedown pattern, directly export complete closedown signal control institute
The second source conversion chip and specific function circuit stated are out of service.
2. shutdown control circuit according to claim 1, it is characterised in that：Master control is provided with the system main circuit
Chip and connected peripheral function circuit, the complete closedown button are connected to output end and the institute of the first power conversion chip
State between main control chip；
When electronic product is in start running status, if main control chip detects the complete closedown button and is pressed, first
Exporting complete closedown signal controls the specific function circuit to close, the peripheral function circuit shutdown described in its secondary control, finally controls
Make the first power conversion chip is out of service, the power supply of cutting system main circuit realizes that total system shuts down.
3. shutdown control circuit according to claim 2, it is characterised in that：In the enable of first power conversion chip
End and systematically between be connected with storage capacitor and discharge resistance, starting key and complete closedown are pressed at the same time by key control electronics
Product is when using complete closedown under off-mode, and the storage capacitor is received and energy-storage battery in a period of starting key is pressed
Electric energy, when starting key disconnects, is discharged by discharge resistance, and the time that the first power conversion chip of delay is closed, is master control
Chip provides the run time needed for the output and data preservation work of its completion complete closedown signal.
4. shutdown control circuit according to claim 3, it is characterised in that：The Enable Pin of first power conversion chip
Connect a pair of diode component negative electrode, the double diode device negative electrode docking, two anodes respectively with described start
Button and main control chip connect one to one；The main control chip exports starting-up signal when needing control complete machine start operation
By the Enable Pin of described double diode device transmission to the first power conversion chip, the first power conversion chip of control continues
Enable operation.
5. shutdown control circuit according to claim 1, it is characterised in that：Touch is provided with the electronic product
Screen, when electronic product is in start running status, transfers shutdown interface, by operating shutdown interface only by operation touch-screen
The described system main circuit shutdown of control, control electronic product, which enters, uses off-mode.
6. shutdown control circuit according to any one of claim 1 to 5, it is characterised in that：The second source conversion
The Enable Pin of chip connects an on-off circuit, and the on-off circuit is receiving the complete closedown signal of system main circuit output
When act, drag down the current potential of the Enable Pin of second source conversion chip, control second source conversion chip is out of service；The system
Main circuit unite when being transferred to open state from total system off-mode, output high level effectively enables signal to the described second electricity
The Enable Pin of source conversion chip, control second source conversion chip enables operation, and cell voltage is converted into the specific function
Operating voltage needed for circuit, is that the specific function circuit is powered, and the operating voltage of output is fed back into the second electricity
The Enable Pin of source conversion chip, maintains second source conversion chip continuous service.
7. shutdown control circuit according to claim 6, it is characterised in that：A N ditches are provided with the on-off circuit
Road metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor receives described complete closedown signal, and drain electrode connects the Enable Pin of second source conversion chip,
Source ground；The enable signal exported by the system main circuit is transmitted to described second by an anti-back biased diode
The Enable Pin of power conversion chip.
8. shutdown control circuit according to any one of claim 1 to 5, it is characterised in that：The specific function circuit
For real time clock circuit, generation clock signal transmission to described system main circuit.
9. shutdown control circuit according to any one of claim 1 to 5, it is characterised in that：The starting key and complete
The button that shuts down is that the complete closedown button is arranged in the shell of electronic product, described without the mechanical key for keeping function
The shell of the exposed electronic product of starting key.
10. a kind of electronic product, it is characterised in that：It is provided with shutdown control electricity as claimed in any one of claims 1-9 wherein
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510156733.9A CN104731305B (en) | 2015-04-03 | 2015-04-03 | Shutdown control circuit and the electronic product with the shutdown control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510156733.9A CN104731305B (en) | 2015-04-03 | 2015-04-03 | Shutdown control circuit and the electronic product with the shutdown control circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN104731305A CN104731305A (en) | 2015-06-24 |
| CN104731305B true CN104731305B (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105045169B (en) * | 2015-06-18 | 2017-09-29 | 江苏辰汉电子科技有限公司 | A kind of Multifunction open shutdown circuit and method for start-up and shutdown |
| CN106610714A (en) * | 2015-10-21 | 2017-05-03 | 中兴通讯股份有限公司 | Switch control circuit and method for terminal |
| CN107887937B (en) * | 2016-09-30 | 2021-03-09 | 环旭电子股份有限公司 | Intelligent circuit and method for controlling power failure |
| CN106339066B (en) * | 2016-11-15 | 2023-10-20 | 歌尔科技有限公司 | Power consumption control method, circuit and wearable electronic product |
| CN108153189B (en) * | 2017-12-20 | 2020-07-10 | 中国航空工业集团公司洛阳电光设备研究所 | Power supply control circuit and method for civil aircraft display controller |
| CN109901430B (en) * | 2019-03-21 | 2022-03-04 | 青岛海信电子设备股份有限公司 | Control system capable of automatically configuring host functions |
| CN110196628A (en) * | 2019-06-04 | 2019-09-03 | 山东浪潮人工智能研究院有限公司 | It is a kind of for extend tablet computer shutdown after service time of battery method and system |
| CN113110156B (en) * | 2021-04-07 | 2023-03-21 | 深圳形天半导体有限公司 | LDO chip and intelligent wearable device |
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| CN201732337U (en) * | 2010-09-01 | 2011-02-02 | 福建三元达软件有限公司 | Switching circuit of handheld device |
| CN103246342A (en) * | 2012-02-10 | 2013-08-14 | 联想(北京)有限公司 | Electronic device and power management method thereof |
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| US7310697B2 (en) * | 2004-11-01 | 2007-12-18 | Hewlett-Packard Development Company, L.P. | System and method for dynamic USB power source |
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| CN201732337U (en) * | 2010-09-01 | 2011-02-02 | 福建三元达软件有限公司 | Switching circuit of handheld device |
| CN103246342A (en) * | 2012-02-10 | 2013-08-14 | 联想(北京)有限公司 | Electronic device and power management method thereof |
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| CN104731305A (en) | 2015-06-24 |
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