CN104731305A - Shutdown control circuit and electronic product with same - Google Patents

Shutdown control circuit and electronic product with same Download PDF

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Publication number
CN104731305A
CN104731305A CN201510156733.9A CN201510156733A CN104731305A CN 104731305 A CN104731305 A CN 104731305A CN 201510156733 A CN201510156733 A CN 201510156733A CN 104731305 A CN104731305 A CN 104731305A
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China
Prior art keywords
circuit
conversion chip
electronic product
shutdown
control
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Granted
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CN201510156733.9A
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CN104731305B (en
Inventor
林大鹏
杜洋
宋超
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Qingdao Goertek Co Ltd
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Qingdao Goertek Co Ltd
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Publication of CN104731305B publication Critical patent/CN104731305B/en
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Abstract

The invention discloses a shutdown control circuit and an electronic product with the same. The shutdown control circuit is provided with a power source management circuit, a system main circuit, a specific function circuit, a startup key and a complete shutdown key. The specific function circuit needs to run continuously when the electronic product is shut down. One end of the startup key is communicated with the positive electrode of a battery, and the other end of the startup key is communicated with the enabled end of a first power source conversion chip. When the startup key is pressed down, the first power source conversion chip is controlled to be enabled to supply power to the system main circuit. One end of the complete shutdown key is communicated with system voltage, and the other end of the complete shutdown key is communicated with the system main circuit. When detecting that the complete shutdown key is pressed down, the system main circuit outputs a complete shutdown signal to control a second power source conversion chip to stop running, the power supplied to the specific function circuit is cut off, and the system main circuit is controlled to be shut down. By designing the whole system shutdown mode, electric quantity consumption of a battery in the electronic product is reduced to the maximum limit, and the storage time of the charged electronic product in a storeroom is prolonged.

Description

Shutdown control circuit and there is the electronic product of described shutdown control circuit
Technical field
The present invention relates to a kind of circuit structure design for controlling electronic product shutdown, specifically, relating to a kind ofly support main system to shut down and total system shuts down the shutdown control circuit of two kinds of patterns and the electronic product that adopts this shutdown control circuit to design.
Background technology
Along with the progress of science and technology, dress electronic product favor by increasing consumer and widely use, the function achieved by it is also increasing.Due to current wearing electronic product, its size is general less, very light in weight, and this just determines the battery that this electronic product applicable uses, and it is all general less on volume and battery capacity.
Directly carry out start when taking this electronic product for the first time in order to enable consumer to experience, production firm all can give the battery preliminary filling small part electricity of interiors of products before product export.Because present a lot of wearing electronic product have the function of displaying time, in order to ensure the accuracy of timing, current production firm is when carrying out circuit design, all that the real-time timepiece chip of deisgn product inside remains the operational mode that powers on, even be in off-mode still continuous firing at electronic product, just result in the lasting consumption of product electricity thus.
Because electronic product is after dispatching from the factory, could arrive in the hand of consumer after may depositing a very long time in storehouse, if the overlong time that storehouse is deposited, there will be the battery power consumption of electronic product totally, the problem that cannot start shooting, thus cause consumer buy time because of cannot normal boot-strap experience and reduce its buy wish.
Therefore, how to reduce the shutdown loss of dressing electronic product as far as possible, guarantee its from dispatch from the factory consumer's hand during this period of time in the electric quantity consumption of battery minimum, even if save for a long time in storehouse, also can ensure that when consumer takes for the first time it can complete time experience by normal boot-strap, be the problem much adopting battery powered electronic product generally to face at present.
Summary of the invention
The object of the present invention is to provide and a kind ofly support main system to shut down and total system shuts down the shutdown control circuit of two kinds of patterns, all shut down by controlling electronic product whole system when dispatching from the factory, the electric quantity consumption of electronic product internal cell can be reduced thus to greatest extent, extend the storehouse resting period after electronic product charging.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of shutdown control circuit, is applied in battery powered electronic product, is provided with electric power management circuit, system main circuit and requires the specific function circuit of continuous service when electronic product uses shutdown in described electronic product; The first power conversion chip that promising system main circuit is powered and the second source conversion chip of powering for described specific function circuit are set in described electric power management circuit; Described electronic product is provided with starting key and complete closedown button, one end of described starting key is communicated with the positive pole of battery, the other end is communicated with the Enable Pin of the first power conversion chip, when starting key is pressed, control the first power conversion chip enable, convert cell voltage to system voltage, for system main circuit is powered; The system voltage described in the connection of one end of described complete closedown button, other end connected system main circuit, described system main circuit is when detecting that complete closedown button is pressed, export complete closedown signal control second source conversion chip out of service, cut off the power supply of described specific function circuit, and the shutdown of control system main circuit.
Further, in described system main circuit, be provided with main control chip and connected peripheral function circuit, described complete closedown button is connected between battery and described main control chip; When electronic product is in start running status, if main control chip detects that described complete closedown button is pressed, then first export complete closedown signal and control the closedown of described specific function circuit, secondly the peripheral function circuit shutdown described in controlling, finally control the first power conversion chip out of service, the power supply of cutting system main circuit, realizes total system shutdown; When electronic product is in use off-mode, if desired control electronic product and proceed to total system shutdown mode, then can press described starting key and complete closedown button, the enable operation when starting key is pressed of described first power conversion chip, for main control chip is powered simultaneously; First whether described main control chip detect complete closedown button and press after the operation that powers on, if be not pressed, then judge to enter power on mode, export control signal and maintain the enable operation of the first power conversion chip, and the start of control system main circuit run; If complete closedown button is pressed, then judges to enter complete closedown pattern, do not start described peripheral function circuit, but directly export complete closedown signal control described in second source conversion chip and specific function circuit out of service, realize total system and shut down.
In order to ensure that main control chip can not power-off before completing necessary work, the present invention described first power conversion chip Enable Pin and systematically between be connected with storage capacitor and discharge resistance, press starting key and complete closedown at the same time by key control electronic product when using complete closedown under off-mode, described storage capacitor during starting key is pressed in receive battery export electric energy and store, when starting key disconnects, discharged by discharge resistance, to postpone the time that the first power conversion chip is closed, thus reserve enough working times for main control chip, to ensure that main control chip can complete the related work such as output and data preservation of complete closedown signal.
In order to ensure when controlling electronic product start and running, even if starting key disconnects, system main circuit also can have lasting electric power supply, the Enable Pin of described first power conversion chip is connected the negative electrode of a pair of diode component by the present invention, the negative electrode docking of described duodiode device, two anodes connect one to one with described starting key and main control chip respectively; Described main control chip, when needs control complete machine start operation, exports starting-up signal by the Enable Pin of described duodiode device transmission to the first power conversion chip, controls the first power conversion chip and continue enable operation, power to be continuously system main circuit.
A kind of preferred design using shutdown mode is entered as controlling described electronic product, the present invention arranges touch-screen on described electronic product, when electronic product is in start running status, shutdown interface is transferred by operation touch-screen, only control described system main circuit shutdown by operation shutdown interface, realize the use shutdown of electronic product.
In order to realize effectively controlling to the operation of second source conversion chip, an on-off circuit is connected in the Enable Pin of described second source conversion chip, the action when receiving the described complete closedown signal that system main circuit exports of described on-off circuit, drag down the current potential of the Enable Pin of second source conversion chip, control second source conversion chip out of service, cut off the power supply of specific function circuit and enter total system off-mode; Described system main circuit is when proceeding to open state from total system off-mode, export the Enable Pin of the effective enable signal of high level to described second source conversion chip, control the enable operation of second source conversion chip, cell voltage is converted to the operating voltage needed for described specific function circuit, for described specific function circuit is powered, and the described operating voltage exported is fed back to the Enable Pin of second source conversion chip, maintain second source conversion chip continuous service, what control described specific function circuit continues the operation that powers on.
Preferably, be provided with a N-channel MOS pipe in described on-off circuit, the complete closedown signal described in grid reception of described metal-oxide-semiconductor, drain electrode connects the Enable Pin of second source conversion chip, source ground; The described enable signal exported by described system main circuit transfers to the Enable Pin of described second source conversion chip by an anti-back biased diode.
Preferably, described specific function circuit can be real time clock circuit, transfers to described system main circuit for generated clock signal, can to realize the function showing real-time clock thus on electronic product.
Preferably, described starting key and complete closedown button preferably adopt the mechanical key not having and keep function, and described complete closedown button is preferably mounted in the shell of electronic product, only operates before electronic product dispatches from the factory for technician; And described starting key can expose the shell of electronic product, for technician and domestic consumer.
Based on the structural design of above-mentioned shutdown control circuit, the invention allows for a kind of electronic product adopting described shutdown control circuit to design, described electronic product adopts powered battery; In described electronic product, be provided with electric power management circuit, system main circuit and require the specific function circuit of continuous service when electronic product uses shutdown; The first power conversion chip that promising system main circuit is powered and the second source conversion chip of powering for described specific function circuit are set in described electric power management circuit; Described electronic product is provided with starting key and complete closedown button, one end of described starting key is communicated with the positive pole of battery, the other end is communicated with the Enable Pin of the first power conversion chip, when starting key is pressed, control the first power conversion chip enable, convert cell voltage to system voltage, for system main circuit is powered; The system voltage described in the connection of one end of described complete closedown button, other end connected system main circuit, described system main circuit is when detecting that complete closedown button is pressed, export complete closedown signal control second source conversion chip out of service, cut off the power supply of described specific function circuit, and the shutdown of control system main circuit.
Compared with prior art, advantage of the present invention and good effect are: the present invention by designing total system shut-off function in electronic product, when electronic product dispatches from the factory, electronic product can be controlled and enter total system shutdown mode, to reduce the consumption of battery electric quantity to greatest extent, ensure that electronic product is after charging is dispatched from the factory, even if house for a long time in storehouse, also as usual to start shooting when arriving in consumer hand operation, complete the time experience of consumer, thereby eliminate because of cannot the impact that causes consumer's purchase intention of problem of start-up.Shutdown control technology proposed by the invention is especially applicable to being applied in the less wearing electronic product of battery capacity, to extend the inventory time of this electronic product as much as possible.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of embodiment of system main circuit in shutdown control circuit proposed by the invention;
Fig. 2 is the system main power circuit schematic diagram of a kind of embodiment providing power supply to supply for system shown in Figure 1 main circuit;
Fig. 3 is the control circuit schematic diagram of a kind of embodiment for controlling system shown in Figure 2 main power circuit;
Fig. 4 is the circuit theory diagrams of a kind of embodiment of specific function circuit in shutdown control circuit proposed by the invention;
Fig. 5 is the power circuit principle figure of a kind of embodiment providing power supply to supply for the circuit of specific function shown in Fig. 4.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
The present embodiment is for the battery powered design of electronic products power circuit of employing, in order to reduce the consumption of battery electric quantity to greatest extent, extend the storehouse resting period of this electronic product as much as possible, ensure that consumer can complete time experience by normal boot-strap when buying this electronic product, the present embodiment designs brand-new shutdown control circuit in described electronic product, on the basis retaining traditional use shutdown tupe, add total system shutdown control model, by controlling the circuit system Close All of electronic product inside, thus farthest save electric energy.
Below to dress electronic product, the particular circuit configurations of the shutdown control circuit that the present embodiment proposes and principle of work thereof are described in detail.
Dress in electronic product in the current overwhelming majority, the system main circuit part of its inside is usually designed to can carry out switching on and shutting down by user to it and control, and for some the specific function circuit in system, such as real time clock circuit etc., in order to ensure the accuracy of timing time, even if user performs power-off operation, this part functional circuit also can not shut down, still at continuous service, cause the lasting consumption to battery electric quantity thus.
The function realized due to this part specific function circuit may not be necessary to take this section in consumer's hand from dispatching from the factory at electronic product during, therefore in order to extend electronic product dispatch from the factory after in resting period of storehouse, the present embodiment propose a kind of control this part specific function circuit during electronic product stock in close, and the design philosophy run without interruption after user uses, then ensureing under the prerequisite that electronic product existing capability is constant, decrease the electric quantity consumption of product during stock, extend the inventory time of product.
In order to realize above-mentioned purpose of design, the present embodiment devises starting key SW1 and complete closedown button SW2 on electronic product, shown in composition graphs 1-Fig. 3, described starting key SW1 and complete closedown button SW2 preferably adopts the mechanical key without maintenance function conventional at present to realize.Wherein, starting key SW1 is used for carrying out start to electronic product and controls, and is connected between the battery of electronic product inside and system main power circuit.Specifically, one end of starting key SW1 can be connected the positive pole VBAT of battery, the Enable Pin CE of the first power conversion chip U5 in other end connected system main power circuit.Described first power conversion chip U5 is used for the operating voltage (hereinafter referred to as system voltage VSYS_3V0) converted to by cell voltage needed for system main circuit, for system main circuit is powered, low pressure difference linear voltage regulator LDO or dc-dc specifically can be selected to realize the conversion of cell voltage to system voltage VSYS_3V0.
The input end VDD of the first power conversion chip U5 is connected the positive pole VBAT of battery by the present embodiment, and by electric capacity C3 ground connection, utilizes electric capacity C3 to carry out filtering process to the voltage that battery exports, to ensure the voltage stabilization being input to the first power conversion chip U5.By the output terminal VOUT connected system main circuit of the first power conversion chip U5, and ensure that the system voltage VSYS_3V0 being supplied to system main circuit stablizes by design filter capacitor C5.
Main control chip U2 and connected peripheral function circuit (not shown) is designed with in system main circuit.In the present embodiment, described main control chip U2, as the control core of whole system, can select single-chip microprocessor MCU or CPU.Because starting key SW1 does not have maintenance function, loose one's grip after user presses, starting key SW1 can disconnect immediately, then causes the first power conversion chip U5 to stop enable.In order to ensure that user is when pressing starting key SW1 and controlling electronic product start, first power conversion chip U5 can continue output system voltage VSYS_3V0, guarantee system main circuit continues the operation that powers on, the present embodiment design main control chip U2 is after entering start operational mode, export the effective starting-up signal PWR_ON_CTL of high level, transfer to the Enable Pin CE of the first power conversion chip U5, control the first power conversion chip U5 and continue enable operation.
As a kind of decision design mode of the present embodiment, the present embodiment devises a duodiode device D2 in the control circuit of system primary power, as shown in Figure 3.Two negative electrode docking of described duodiode device D2, and be connected with the Enable Pin CE of the first power conversion chip U5, the starting key SW1 described in the connection of one, two anodes of duodiode device D2, another connects the pin that described main control chip U2 exports starting-up signal PWR_ON_CTL, a wherein road GPIO mouth P0.10 of such as main control chip U2.Utilize the reverse cut-off characteristics of diode component, ensure the enable signal produced by pressing starting key SW1 and the Enable Pin CE that can be sent to the first power conversion chip U5 by the starting-up signal PWR_ON_CTL that main control chip U2 exports with the correct flow direction, control the first power conversion chip U5 during electronic product start runs in continue enable operation.
The first power conversion chip U5 Enable Pin CE and systematically between be also connected to storage capacitor C4 and discharge resistance R8, as shown in Figure 2, for delay first power conversion chip U5 turn off sequential.The principle of work of this partial circuit is specifically set forth in follow-up description.
Complete closedown button SW2 is for controlling the whole system circuit Close All of electronic product, and the present embodiment connects at the output terminal VOUT of the first power conversion chip U5 and wherein between a road GPIO mouth P0.28 of main control chip U2, as shown in Figure 1.When main control chip U2 detects that described complete closedown button SW2 presses, namely when its GPIO mouth P0.28 becomes high level by low transition, export complete closedown signal RTC_LDO_SHUT(to be exported by the other road GPIO mouth P0.09 of main control chip U3) to the specific function circuit in electronic product, control described specific function circuit and close.
In the present embodiment, described specific function circuit is preferably described for real time clock circuit, comprises the chief component such as second source conversion chip U1 and real-time timepiece chip U4, shown in composition graphs 4, Fig. 5.Described second source conversion chip U1 can select low pressure difference linear voltage regulator LDO or dc-dc equally, for cell voltage being converted to the operating voltage RTC_3V0 needed for described real-time timepiece chip U4, for real-time timepiece chip U4 powers.
Specifically, the input end VDD of second source conversion chip U1 can be connected the positive pole VBAT of battery, and by filter capacitor C2 ground connection; The output terminal VOUT of second source conversion chip U1 is connected the feeder ear VDD of real-time timepiece chip U4, and by filter capacitor C1, C7, filtering process is carried out to the operating voltage RTC_3V0 that second source conversion chip U1 changes output.Current-limiting resistance R3 of being leaded up to by the Enable Pin CE of second source conversion chip U1 is connected to its output terminal VOUT, separately lead up to the switch ways ground connection of an on-off circuit, the main control chip U2 described in control end connection of described on-off circuit, receives the complete closedown signal RTC_LDO_SHUT that main control chip U2 exports.
In the present embodiment, described on-off circuit preferably adopts a N-channel MOS pipe Q1 to coordinate simple periphery circuit design to form, as shown in Figure 5.The grid of N-channel MOS pipe Q1 is connected to the P0.09 pin of main control chip U2, receives the complete closedown signal RTC_LDO_SHUT that main control chip U2 exports, and by configuration resistance R4 ground connection.By the source ground of described N-channel MOS pipe Q1, drain electrode connects the Enable Pin CE of second source conversion chip U1, or is connected to the Enable Pin CE of second source conversion chip U1 by the resistance R5 that resistance is less.When needs control real-time timepiece chip U4 closedown, high level effective complete closedown signal RTC_LDO_SHUT can be exported by main control chip U2, then N-channel MOS pipe Q1 saturation conduction is controlled, drag down the current potential of the Enable Pin CE of second source conversion chip U1, control second source conversion chip U1 out of service, and then the power supply cut off to real-time timepiece chip U4, to reach the purpose of design controlling real-time timepiece chip U4 power-off shutdown.
Certainly, described on-off circuit also can adopt other components and parts with on-off action such as triode, controllable silicon to carry out the specific design of circuit, and the present embodiment is not limited in above citing.
In addition, in order to after real-time timepiece chip U4 closes, operation can be restarted, the present embodiment design main control chip U2 is when needs control real-time timepiece chip U4 start, output enable signal RTC_LDO_EN(is such as exported by the GPIO mouth P0.08 of main control chip U2), the Enable Pin CE of second source conversion chip U1 is transferred to by anti-back biased diode D105 and current-limiting resistance R1, control the enable operation of second source conversion chip U1, and then operating voltage RTC_3V0 cell voltage converted to needed for real-time timepiece chip U4, for real-time timepiece chip U4 powers.After real-time timepiece chip U4 powers on and runs, generated clock signal, via I 2c bus SDA, SCL transfer to main control chip U2, generate present clock via main control chip U2, and by the display screen output display on electronic product.
Below in conjunction with the circuit structure shown in Fig. 1-Fig. 5, the principle of work of the present embodiment is specifically addressed.
Before electronic product dispatches from the factory, in order to extend the inventory time of electronic product, technician can operate electronic product and enter total system shutdown mode.For the current residing state of electronic product: use off-mode or open state, the present embodiment proposes two kinds and controls the mode of operation that electronic product enters total system shutdown mode.
If current being in of electronic product uses off-mode (namely system main circuit is closed, and specific function circuit runs), now, the mode simultaneously pressing starting key SW1 and complete closedown button SW2 can be adopted to enter total system shutdown mode to control electronic product.When starting key SW1 presses, cell voltage VBAT is after filter capacitor C8 filtering, control one of them the diode forward conducting in duodiode device D2, another diode reverse is ended, and the Enable Pin CE of the first power conversion chip U5 is transferred to by the diode of conducting, control the enable operation of the first power conversion chip U5, and simultaneously for storage capacitor C4 charges.After the enable operation of first power conversion chip U5, cell voltage VBAT being converted to system voltage VSYS_3V0 is that main control chip U2 powers, and main control chip U2 is started shooting and runs.Whether, after main control chip U2 starts shooting, first detect complete closedown button SW2 and be pressed, if complete closedown button SW2 is not pressed, then judge that requirement enters power on mode, concrete control procedure will be described in detail at further part.If complete closedown button SW2 is pressed, then judge that requirement enters total system shutdown mode.Now, main control chip U2 exports high level effective complete closedown signal RTC_LDO_SHUT, controls N-channel MOS pipe Q1 saturation conduction, drags down the Enable Pin CE current potential of second source conversion chip U1, control second source conversion chip U1 out of service.Now, because second source conversion chip U1 no longer exports the operating voltage RTC_3V0 needed for real-time timepiece chip U4, therefore, real-time timepiece chip U4 power-off is out of service.Then, main control chip U2 enters off-mode, preserves the data of register, storer.Because starting key SW1 is pressing and can disconnect because technician looses one's grip after keeping a period of time, enough for performing startups, exporting complete closedown signal RTC_LDO_SHUT and carrying out the time of the work such as data preservation in order to reserve to main control chip U2, the present embodiment can adopt the mode suitably adjusting the capacitance of storage capacitor C4 and the resistance of discharge resistance R8 to meet the requirement of main control chip U2 working time.That is, after starting key SW1 disconnects, storage capacitor C4 is discharged by discharge resistance R8.During storage capacitor C4 discharges, the Enable Pin CE of the first power conversion chip U5 still can keep high level effective status, thus maintenance the first power conversion chip U5 continues enable operation, for main control chip U2 powers.At the end of storage capacitor C4 discharges, the Enable Pin CE current potential step-down of the first power conversion chip U5, the first power conversion chip U5 is out of service, cuts off the power supply to main control chip U2, and then controls main control chip shutdown, just achieves total system shut-off function thus.
If electronic product is current be in start running status, then the mode pressing complete closedown button SW2 now can be adopted to enter total system shutdown mode to control electronic product.When complete closedown button SW2 is pressed, changed the system voltage VSYS_3V0 exported transfers to main control chip U2 P0.28 pin via closed complete closedown button SW2 by the first power conversion chip U5.Main control chip U2, when detecting that the current potential of its P0.28 pin uprises, judges that requirement enters total system shutdown mode.Now, first main control chip U2 exports complete closedown signal RTC_LDO_SHUT, controls second source conversion chip U1 and real-time timepiece chip U4 out of service; Secondly, the shutdown of connected peripheral function circuit is controlled; Then, the starting-up signal PWR_ON_CTL that main control chip U2 is exported is set to low level, and now storage capacitor C4 is discharged by discharge resistance R8, controls the first power conversion chip U5 and closes after the maintenance RC time.During storage capacitor C4 discharges, the data of main control chip U2 to register, storer are preserved, and when the first power conversion chip U5 closes, total system enters shutdown mode.
After electronic product enters total system shutdown mode, due to without any electric quantity consumption, therefore can ensure that electronic product is deposited for a long time in storehouse.
When electronic product first time sells in consumer's hand, starting key SW1 can be pressed and control electronic product start operation.When starting key SW1 presses, cell voltage VBAT is first utilized to control the enable operation of the first power conversion chip U5, for system main circuit is powered.After main control chip U2 powers on operation, export the starting-up signal PWR_ON_CTL of high level, the Enable Pin CE of the first power conversion chip U5 is transferred to by duodiode device D2, even if make the first power conversion chip U5 also can continue enable operation after starting key SW1 disconnects, always for system main circuit is powered, realize auto-lock function.Then, main control chip U2 exports the enable signal RTC_LDO_EN of high level, the Enable Pin CE of second source conversion chip U1 is acted on by anti-back biased diode D106 and current-limiting resistance R1, control the enable operation of second source conversion chip U1, export the operating voltage RTC_3V0 needed for real-time timepiece chip U4, control real-time timepiece chip U4 and to power on operation.After the enable operation of second source conversion chip U1, the operating voltage RTC_3V0 exported by second source conversion chip U1 is acted on simultaneously the Enable Pin CE of second source conversion chip U1 via current-limiting resistance R3, thus one, even if when main control chip U2 power-off no longer exports the enable signal RTC_LDO_EN of high level, the operating voltage RTC_3V0 that second source conversion chip U1 self also can be utilized to export maintains second source conversion chip U1 enable operation always, and then ensure that real-time timepiece chip U4 can keep running status in start with under using off-mode, guarantee the accuracy of timing.
When consumer starts described electronic product first time, need to adjust system clock, once after adjustment, real-time timepiece chip U4 can add up timing time automatically, ensures the accurate display of system clock in the future.Main control chip U2, after control specific function circuit start runs, exports control signal and controls the operation of connected peripheral function circuit start, complete product start.
After consumer performs a starting up to described electronic product, if consumer does not think that use needs shutdown, shutdown interface can be transferred out by the touch-screen operating electronic product, enter use off-mode by operation shutdown interface control electronic product.When electronic product because user operation needs to enter use off-mode, or during automatic shutdown not enough in battery electric quantity, first main control chip U2 controls the shutdown of connected peripheral function circuit, then putting starting-up signal PWR_ON_CTL is low level, and stopping provides effective enable signal to the first power conversion chip U5.Then, main control chip U2 enters off-mode, preserves the data of register, storer, after storage capacitor C4 electric discharge terminates, the first power conversion chip U5 is out of service, the power supply of cutting system main circuit, system main circuit is out of service, and electronic product enters use off-mode.Now, because second source conversion chip U1 and real-time timepiece chip U4 is still in operation, when therefore can ensure again to start shooting, the accuracy of clock display, need not start shooting at every turn all need to reset the time.
When needing again to start shooting after consumer's shutdown, only need press starting key SW1, controlling the enable operation of the first power conversion chip U5, for system main circuit is powered.Starting-up signal PWR_ON_CTL draws high, completes the self-locking of the first power conversion chip U5 after starting by main control chip U2, then controls the start of connected peripheral function circuit and runs, complete the starting up of electronic product.
Consider that the crowd that different shutdown modes is suitable for is different, for electronic product total system shutdown controlling functions and be not suitable for ordinary consumer use, therefore, complete closedown button SW2 is preferably arranged on the inside of electronic product by the present embodiment, such as be built in the inside of product casing, touch operation to avoid consumer.Starting key SW1 is then preferably arranged on the shell of electronic product, or adopts the mode that perforate exposes on shell, operates to facilitate consumer.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.

Claims (10)

1. a shutdown control circuit, is applied in battery powered electronic product, is provided with electric power management circuit, system main circuit and requires the specific function circuit of continuous service when electronic product uses shutdown in described electronic product; It is characterized in that: the first power conversion chip that promising system main circuit is powered and the second source conversion chip of powering for described specific function circuit are set in described electric power management circuit; Described electronic product is provided with starting key and complete closedown button, one end of described starting key is communicated with the positive pole of battery, the other end is communicated with the Enable Pin of the first power conversion chip, when starting key is pressed, control the first power conversion chip enable, convert cell voltage to system voltage, for system main circuit is powered; The system voltage described in the connection of one end of described complete closedown button, other end connected system main circuit, described system main circuit is when detecting that complete closedown button is pressed, export complete closedown signal control second source conversion chip out of service, cut off the power supply of described specific function circuit, and the shutdown of control system main circuit.
2. shutdown control circuit according to claim 1, is characterized in that: in described system main circuit, be provided with main control chip and connected peripheral function circuit, described complete closedown button is connected between battery and described main control chip;
When electronic product is in start running status, if main control chip detects that described complete closedown button is pressed, then first export complete closedown signal and control the closedown of described specific function circuit, secondly the peripheral function circuit shutdown described in controlling, finally control the first power conversion chip out of service, the power supply of cutting system main circuit, realizes total system shutdown;
When electronic product is in use off-mode, if desired control electronic product and proceed to total system shutdown mode, then press described starting key and complete closedown button, the enable operation when starting key is pressed of described first power conversion chip, for main control chip is powered simultaneously; First whether described main control chip detect complete closedown button and press after the operation that powers on, if be not pressed, then judge to enter power on mode, export control signal and maintain the enable operation of the first power conversion chip, and the start of control system main circuit run; If complete closedown button is pressed, then judge to enter complete closedown pattern, directly export second source conversion chip described in the control of complete closedown signal and specific function circuit out of service.
3. shutdown control circuit according to claim 2, it is characterized in that: described first power conversion chip Enable Pin and systematically between be connected with storage capacitor and discharge resistance, press starting key and complete closedown at the same time by key control electronic product when using complete closedown under off-mode, described storage capacitor during starting key is pressed in receive and energy-storage battery electric energy, when starting key disconnects, discharged by discharge resistance, postpone the time that the first power conversion chip is closed, for main control chip provides the working time needed for its output completing complete closedown signal and data preservation work.
4. shutdown control circuit according to claim 3, it is characterized in that: the Enable Pin of described first power conversion chip connects the negative electrode of a pair of diode component, the negative electrode docking of described duodiode device, two anodes connect one to one with described starting key and main control chip respectively; Described main control chip, when needs control complete machine start operation, exports starting-up signal by the Enable Pin of described duodiode device transmission to the first power conversion chip, controls the first power conversion chip and continue enable operation.
5. shutdown control circuit according to claim 1, it is characterized in that: on described electronic product, be provided with touch-screen, when electronic product is in start running status, shutdown interface is transferred by operation touch-screen, only control described system main circuit shutdown by operation shutdown interface, control electronic product and enter use off-mode.
6. shutdown control circuit according to any one of claim 1 to 5, it is characterized in that: the Enable Pin of described second source conversion chip connects an on-off circuit, the action when receiving the described complete closedown signal that system main circuit exports of described on-off circuit, drag down the current potential of the Enable Pin of second source conversion chip, control second source conversion chip out of service; Described system main circuit is when proceeding to open state from total system off-mode, export the Enable Pin of the effective enable signal of high level to described second source conversion chip, control the enable operation of second source conversion chip, cell voltage is converted to the operating voltage needed for described specific function circuit, for described specific function circuit is powered, and the described operating voltage exported is fed back to the Enable Pin of second source conversion chip, maintain second source conversion chip continuous service.
7. shutdown control circuit according to claim 6, it is characterized in that: in described on-off circuit, be provided with a N-channel MOS pipe, the complete closedown signal described in grid reception of described metal-oxide-semiconductor, drain electrode connects the Enable Pin of second source conversion chip, source ground; The described enable signal exported by described system main circuit transfers to the Enable Pin of described second source conversion chip by an anti-back biased diode.
8. shutdown control circuit according to any one of claim 1 to 5, is characterized in that: described specific function circuit is real time clock circuit, and generated clock Signal transmissions is to described system main circuit.
9. shutdown control circuit according to any one of claim 1 to 5, it is characterized in that: described starting key and complete closedown button are do not have the mechanical key keeping function, described complete closedown button is arranged in the shell of electronic product, and described starting key exposes the shell of electronic product.
10. an electronic product, is characterized in that: be provided with shutdown control circuit as claimed in any one of claims 1-9 wherein.
CN201510156733.9A 2015-04-03 2015-04-03 Shutdown control circuit and the electronic product with the shutdown control circuit Active CN104731305B (en)

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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
CN105045169A (en) * 2015-06-18 2015-11-11 江苏辰汉电子科技有限公司 Multifunctional startup and shutdown circuit and startup and shutdown method
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
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CN108153189A (en) * 2017-12-20 2018-06-12 中国航空工业集团公司洛阳电光设备研究所 A kind of power control circuit and method of civil aircraft display controller
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
CN109901430A (en) * 2019-03-21 2019-06-18 青岛海信电子设备股份有限公司 A kind of control system automatically configuring host function
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
CN113110156A (en) * 2021-04-07 2021-07-13 深圳形天半导体有限公司 LDO chip and intelligent wearable device

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