CN103869722B - A kind of controlling hard switch machine system - Google Patents

A kind of controlling hard switch machine system Download PDF

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Publication number
CN103869722B
CN103869722B CN201410139119.7A CN201410139119A CN103869722B CN 103869722 B CN103869722 B CN 103869722B CN 201410139119 A CN201410139119 A CN 201410139119A CN 103869722 B CN103869722 B CN 103869722B
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resistance
circuit
hardware
ground
audion
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CN103869722A (en
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关晓丽
关贤光
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Guangdong Biolight Meditech Co Ltd
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Guangdong Biolight Meditech Co Ltd
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Abstract

The open a kind of controlling hard switch machine system of the present invention, including power supply and current foldback circuit, switching on and shutting down button, hardware boot-strap circuit, software shutdown circuit, hardware circuit for forced shutdown, hardware forced shutdown time adjustment circuit and key press detecting circuit.Compared with prior art, the controlling hard switch machine system that the present invention provides, the hardware unused time is controlled, and off-mode can detect, standby almost zero-power simple, safe and reliable.

Description

A kind of controlling hard switch machine system
Technical field
The present invention relates to field of medical device, exactly refer to a kind of controlling hard switch machine system.
Background technology
At present, in the on/off circuit of armarium, design one is hardware switch machine, another kind of Being software switch machine mode, the third is hardware switch machine+software shutdown mode.The first is to pass through power supply Pressing and the control system power supply disconnecting machinery of button, control mode is simple and standby current is up to zero power Consumption.The second carrys out the open and close of control system power supply by microcontroller, can enter after closing system power supply Entering holding state, still can consume mA rank or hundreds of uA level currents, more serious problem is micro-control Device processed crashes or in the case of paralysis, could recover in the case of only disconnecting battery and external power source, for Product maintenance brings very big inconvenience.The third is the combination of first two, and this circuit also passes through many improvement, Wherein there is the control mode hardware switch machine machinery to change circuit control into, such as utilize good the taking of trigger Reflexive reaches to substitute the purpose that Machinery Control System opens and closes, and stability is higher, but triggers Device obtains moment power consumption.
Along with the lifting of modern medical equipment technology, also on/off circuit is had higher requirement: 1, Some users configure data and the critical data that processing obtains and can close after being preserved in time again Motor-driven work, now shut down the immediately mode of power-off of mechanical type is inadvisable;2, the feelings that soft-off is malfunctioning are being encountered Under condition, must have hardware forced shutdown, now the mode of MCU control system power supply is inadvisable;3, accomplish Low-power consumption, battery uses more longlasting, and now the static power consumption of mA rank or hundreds of uA level currents obtains in addition Improve.
Summary of the invention
For drawbacks described above, present invention solves the technical problem that and be to provide a kind of controlling hard switch machine system, hardware Unused time is controlled, and off-mode can detect, standby almost zero-power simple, safe and reliable.
In order to solve above technical problem, the controlling hard switch machine system that the present invention provides, including power supply and mistake Stream protection circuit, switching on and shutting down button, hardware boot-strap circuit, software shutdown circuit, hardware circuit for forced shutdown, Hardware forced shutdown time adjustment circuit and key press detecting circuit, wherein:
Described power supply and current foldback circuit: realize short circuit or power consumption that late-class circuit operation irregularity is occurred During excessive phenomenon, reach the effect of power cutoff protection late-class circuit;
Described switching on and shutting down button: realize manually triggering hardware starting-up signal and triggering soft-off signal and hardware Forced shutdown;
Described hardware boot-strap circuit: transmit the process of starting-up signal after realizing manual trigger switch machine button;
Described hardware forced shutdown time adjustment circuit: the time realizing forced shutdown controls;
Described key press detecting circuit: realize soft-off for controller and triggering signal is provided;
Described software shutdown circuit: provide function realizing circuit for controller output off signal;
Described hardware circuit for forced shutdown: when soft-off lost efficacy, reaches the purpose of accurately shutdown at any time.
Preferably, described power supply and current foldback circuit are particularly as follows: power supply is adapter and battery, adaptive The outfan of device and battery connects self-recoverage by diode (D20) and diode (D18) respectively and insures Silk (F1), the outfan of described resettable fuse (F1) is connected with the source electrode of power MOS pipe (U28);Institute The source electrode stating power MOS pipe (U28) is connected with its grid by resistance (R150), described power MOS pipe (U28) outfan, i.e. drain electrode are connected to filter capacitor (C75) and filter capacitor (C77), then with load phase Even.
Preferably, described switching on and shutting down button (K1) is particularly as follows: its one end connecting pin (1,4) is with described The source electrode of power MOS pipe (U28) connects, and starts shooting with hardware in other end connecting pin (2,3) point three tunnels Circuit, hardware circuit for forced shutdown, the input parallel join of key press detecting circuit.
Preferably, described hardware boot-strap circuit is particularly as follows: by the connection of described switching on and shutting down button (K1) Foot (2,3) is connected with the positive pole of diode (D2), and described diode (D2) negative pole passes through electric capacity (C158) Being connected to the ground, described diode (D2) negative pole is also by resistance (R96) and power MOS pipe (U16) Grid be connected, described power MOS pipe (U16) grid is connected to the ground by resistance (R90);Described Power MOS pipe (U16) source ground, the drain electrode of described power MOS pipe (U16) and described power The grid of metal-oxide-semiconductor (U28) connects.
Preferably, described software shutdown circuit is particularly as follows: its one end is connected with master control I/O port, and the other end is straight Connecing and be connected with audion (Q1) base stage, the base stage of described audion (Q1) is connected by electric capacity (C9) To ground, the emitter stage of described audion (Q1) is directly grounded, and the colelctor electrode of described audion (Q1) leads to Cross resistance (R7) to be connected with diode (D1) negative pole, the positive pole of described diode (D1) and VCC Being connected, the colelctor electrode of described audion (Q1) is also by resistance (R151) and described power MOS pipe (U16) Grid connect;The drain electrode of described power MOS pipe (U16) and the grid of power MOS pipe (U28) Connect, the source ground of described power MOS pipe (U16).
Preferably, described hardware circuit for forced shutdown particularly as follows: its input by resistance (R155) with The connecting pin (2,3) of switching on and shutting down button (K1) connects, described resistance (R155) also with stabilivolt (U31) Crus secunda connect, described resistance (R155) is also by the of resistance (R154) and stabilivolt (U31) One foot connects;The first of described stabilivolt (U31) passes through resistance (R145) ground connection, described stabilivolt (U31) The 3rd foot be directly grounded, the crus secunda of described stabilivolt (U31) pass through electric capacity (C168) ground connection, institute The crus secunda stating stabilivolt (U31) is connected to ground, described stabilivolt (U31) also by resistance (R208) Crus secunda be connected with diode (D15) also by resistance (R207);Described diode (D15) Positive pole is connected with electric capacity (C170) positive pole;Described electric capacity (C170) minus earth, described electric capacity (C170) Positive pole be connected with the 3rd foot of amplifier (U9) by resistance (R209), described electric capacity (C170) Positive pole is connected to ground also by electric capacity (C106);3rd foot of described amplifier (U9) is also by resistance (R210) It is connected to the ground, the 4th foot ground connection of described amplifier (U9), the octal of described amplifier (U9) and two poles Pipe (D15) negative pole connect, the octal of described amplifier (U9) also with diode (D8) and two poles The negative pole of pipe (D9) connects;The positive pole of described diode (D8) and the connection of switching on and shutting down button (K1) Foot (2,3) is connected, and the positive pole of described diode (D9) is connected with VCC;Described amplifier (U9) First foot is connected with audion (Q12) base stage by resistance (R158);Described audion (Q12) Base stage is connected to the ground by resistance (R211), the grounded emitter of described audion (Q12), and described three The colelctor electrode of pole pipe (Q12) is connected with the grid of described power MOS pipe (U16);Described amplifier (U9) Crus secunda be connected with the crus secunda of stabilivolt (U43) by resistance (R213);Described stabilivolt (U43) Crus secunda be connected with the crus secunda of self, the first foot of described stabilivolt (U43) is also by resistance (R212) It is connected with the connecting pin (2,3) of switching on and shutting down button (K1);
Preferably, described hardware forced shutdown time adjustment circuit is particularly as follows: belong to hardware circuit for forced shutdown A part, its unused time t=RC, i.e. t=R207*C170.
Preferably, described key press detecting circuit is particularly as follows: its input connects three by resistance (R124) The base stage of pole pipe (Q9), the base stage of described audion (Q9) is connected to ground, institute by electric capacity (C109) The colelctor electrode stating audion (Q9) meets VCC, and the emitter stage of described audion (Q9) passes through resistance (R125) Ground connection, the emitter stage of described audion (Q9) connects micro-control unit (MCU) also by resistance (R132) I/O port, the I/O port of described micro-control unit (MCU) is pulled down to ground by resistance (R131).
Compared with prior art, the controlling hard switch machine system that the present invention provides, the hardware unused time is controlled, shutdown State can detect, standby almost zero-power simple, safe and reliable.
Accompanying drawing explanation
Fig. 1 is the theory diagram of controlling hard switch machine system in the embodiment of the present invention;
Fig. 2 is the circuit structure diagram of controlling hard switch machine system in the embodiment of the present invention.
Detailed description of the invention
In order to those skilled in the art better understood when technical scheme provided by the present invention, below knot Conjunction specific embodiment is illustrated.
Referring to Fig. 1 and Fig. 2, Fig. 1 is the theory diagram of controlling hard switch machine system in the embodiment of the present invention;Figure 2 is the circuit structure diagram of controlling hard switch machine system in the embodiment of the present invention.
The controlling hard switch machine system that the embodiment of the present invention provides, including power supply and current foldback circuit, switching on and shutting down Button, hardware boot-strap circuit, software shutdown circuit, hardware circuit for forced shutdown, hardware forced shutdown time Regulation circuit and key press detecting circuit, wherein:
Power supply and current foldback circuit: realize short circuit that late-class circuit operation irregularity occurred or power consumption is excessive During phenomenon, reach the effect of power cutoff protection late-class circuit;Switching on and shutting down button: realize manually triggering hardware Starting-up signal and triggering soft-off signal and hardware forced shutdown;Hardware boot-strap circuit: realize manually triggering The process of starting-up signal is transmitted after switching on and shutting down button;Hardware forced shutdown time adjustment circuit: realize forcing to close The time of machine controls;Key press detecting circuit: realize soft-off for controller and triggering signal is provided;Software shuts down Circuit: provide function realizing circuit for controller output off signal;Hardware circuit for forced shutdown: when soft pass When machine lost efficacy, reach the purpose of accurately shutdown at any time.
Power supply and current foldback circuit: power supply is that the outfan of adapter and battery, adapter and battery divides Tong Guo not connect resettable fuse F1 by diode D20 and diode D18, resettable fuse F1's Outfan is connected with the source electrode of power MOS pipe U28;The source electrode of power MOS pipe U28 passes through resistance R150 is connected with its grid, the outfan of power MOS pipe U28, i.e. drain electrode is connected to filter capacitor C75 And filter capacitor C77, then it is connected with load;
Switching on and shutting down button K1: its one end connecting pin 1,4 is connected, separately with the source electrode of power MOS pipe U28 2,3 points of three tunnels of one end connecting pin and hardware boot-strap circuit, hardware circuit for forced shutdown, key press detecting circuit Input parallel join;
Hardware boot-strap circuit: connected by the positive pole of the connecting pin 2,3 of switching on and shutting down button K1 with diode D2 Connecing, diode D2 negative pole is connected to the ground by electric capacity C158, and diode D2 negative pole is also by resistance R96 Being connected with the grid of power MOS pipe U16, power MOS pipe U16 grid is connected to by resistance R90 Ground;Power MOS pipe U16 source ground, the drain electrode of power MOS pipe U16 and power MOS pipe U28 Grid connect;
Software shutdown circuit: its one end is connected with master control I/O port, the other end is directly and audion Q1 base stage Connecting, the base stage of audion Q1 is connected to the ground by electric capacity C9, and the emitter stage of audion Q1 is directly grounded, The colelctor electrode of audion Q1 is connected with diode D1 negative pole by resistance R7, the positive pole of diode D1 and VCC is connected, and the colelctor electrode of audion Q1 is also by the grid of resistance R151 Yu power MOS pipe U16 Connect;The drain electrode of power MOS pipe U16 is connected with the grid of power MOS pipe U28, power MOS The source ground of pipe U16;
Hardware circuit for forced shutdown: its input is by the connecting pin of resistance R155 and switching on and shutting down button K1 2,3 connect, and resistance R155 also crus secunda with stabilivolt U31 is connected, and resistance R155 is also by resistance First foot of R154 and stabilivolt U31 is connected;The first of stabilivolt U31 passes through resistance R145 ground connection, 3rd foot of stabilivolt U31 is directly grounded, and the crus secunda of stabilivolt U31 passes through electric capacity C168 ground connection, surely The crus secunda of pressure pipe U31 is connected to ground also by resistance R208, and the crus secunda of stabilivolt U31 is also by resistance R207 is connected with diode D15;The positive pole of diode D15 is connected with electric capacity C170 positive pole;Electric capacity C170 Minus earth, the positive pole of electric capacity C170 is connected with the 3rd foot of amplifier U9 by resistance R209, electric capacity The positive pole of C170 is connected to ground also by electric capacity C106;3rd foot of amplifier U9 is also by resistance R210 even Being connected to ground, the 4th foot ground connection of amplifier U9, the octal of amplifier U9 is connected with the negative pole of diode D15, The octal of amplifier U9 also negative pole with diode D8 and diode D9 is connected;The positive pole of diode D8 Being connected with the connecting pin 2,3 of switching on and shutting down button K1, the positive pole of diode D9 is connected with VCC;Amplifier First foot of U9 is connected with audion Q12 base stage by resistance R158;The base stage of audion Q12 is passed through Resistance R211 is connected to the ground, the grounded emitter of audion Q12, the colelctor electrode of audion Q12 and power The grid of metal-oxide-semiconductor U16 connects;The crus secunda of amplifier U9 is by resistance R213 and stabilivolt U43's Crus secunda connects;The crus secunda of stabilivolt U43 be connected with the crus secunda of self, the of stabilivolt U43 One foot is connected also by the connecting pin 2,3 of resistance R212 and switching on and shutting down button K1;
Hardware forced shutdown time adjustment circuit: belong to a part for hardware circuit for forced shutdown, during its shutdown Between t=RC, i.e. t=resistance R207* electric capacity C170;
Key press detecting circuit: its input base stage by resistance R124 connecting triode Q9, audion The base stage of Q9 is connected to ground by electric capacity C109, and the colelctor electrode of audion Q9 meets VCC, audion Q9's Emitter stage passes through resistance R125 ground connection, and the emitter stage of audion Q9 connects microcontroller also by resistance R132 The I/O port of unit MCU, the I/O port of micro-control unit MCU is pulled down to ground by resistance R131.
In the present embodiment, the course of action of the controlling hard switch machine system that the present invention provides is as follows:
1), hardware start:
When being not keyed up, when switching on and shutting down button K1 presses, the connecting pin 2,3 of switching on and shutting down button K1 connects electricity Source adapter or battery, now high level guides power MOS pipe by diode D2 and resistance R96 The grid of U16, now the grid of power MOS pipe U16 sets high so that power MOS pipe U16 turns on, Its drain electrode level sets low and causes power MOS pipe U28 to turn on, and VCC is powered subsequently, and VCC is again Set high the grid of power MOS pipe through diode D1 and resistance R7, resistance R151, maintain merit Metal-oxide-semiconductor U16 is in the conduction state for rate, finally realizes start.
2), button detection:
After start, when switching on and shutting down button K1 presses, produce high level, open audion by R124 Q9, after VCC carries out dividing potential drop by resistance R131 and resistance R132 subsequently, micro-control unit MCU is arrived in output It is acquired, detects that high level is switching on and shutting down button K1 and presses;After switching on and shutting down button K1 unclamps, What micro-control unit MCU collected is low level.
3), software shutdown:
After start, MCU, according to oneself requirement, can export high level to make audion Q1 turn on, so Post-tensioning low-power metal-oxide-semiconductor U16, causes power MOS pipe U16 cut-off to reach to close power MOS Pipe U28, it is achieved software shuts down.
4), hardware forced shutdown:
After start, if soft-off lost efficacy or micro-control unit MCU crashes, can grow by switching on and shutting down button K1, level reduction of fractions to a common denominator two-way flows to crus secunda and the 3rd foot of amplifier U9, flows to the crus secunda electricity of amplifier U9 Flat by exporting a fixed level 2.5V after resistance R212 and stabilivolt U43 process, this fixed level is made On the basis of voltage source export the crus secunda of amplifier U9;The 3rd foot level flowing to amplifier U9 passes through resistance R155, resistance R154, resistance R145 and stabilivolt U31 export 6.25V level after processing, with after warp Crossing resistance R207 to charge to electric capacity C170, charging level is through resistance R207, resistance R209 and resistance The 3rd foot to amplifier U9 is exported, when level exceedes the crus secunda reference voltage of amplifier U9 after R210 dividing potential drop During 2.5V, the first foot of amplifier U9 is become high level from original low level, and high level passes through resistance R158 Open audion Q12, audion Q12 drag down the grid of power MOS pipe U16, now power MOS Pipe U16 ends, thus reaches to close power MOS pipe U28, it is achieved hardware forced shutdown.
Supplementary notes about RC delay circuit:
The calculating of RC delay circuit time, simple method is exactly t=RC, i.e. the time constant in RC loop, When charging, often spending the time of a t, on capacitor, voltage just rising (1-1/e) approximates 0.632 times Input source voltage (voltage on resistance R208 in circuit the most of the present invention) and the condenser voltage (present invention Voltage on circuit capacitance C170) difference;For the hardware unused time is controlled in circuit of the present invention T=RC=R208*C170=100*10^3* (33/10^6)=3.3 second, then the 3rd foot input electricity of amplifier U9 Pressure must exceed the input voltage of crus secunda within the time of 3.3 seconds.Theoretical according to this, electricity is rationally set Resistance R207, resistance R209, the resistance of resistance R210, when can design the hardware shutdown of controllable precise Between.
Supplementary notes about standby current:
In the power-offstate, actual measurement has the static power consumption less than 20uA to this circuit, mainly comes from power MOS Pipe, size being taken from pull-up resistor R150, if also needing to reduce static power consumption size, can be taked to increase resistance Mode, but its turn-off capacity decreases, so can be adjusted according to actual, and the circuit of the present embodiment Take its representative value 10K.
Compared with prior art, the controlling hard switch machine system that the present invention provides, the hardware unused time is controlled, shutdown State can detect, standby almost zero-power simple, safe and reliable, specifically, has the advantage that
1, all using discrete device composition, circuit is simple, safe and reliable to operation, should than present congenerous Having lower power consumption for the treatment of with circuit, actual measurement is less than 20uA;
2, the present invention is the situation preventing software shutdown malfunctioning, adds hardware forced shutdown so that product Safety is greatly promoted, and safeguards and obtains bigger convenience;
3, the hardware unused time of the present invention is controlled, and t=RC is more suitable for modern medical equipment and joins user Put data and the critical data that processing obtains the particular/special requirement that can be preserved in time.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses this Invention.Multiple amendment to these embodiments will be apparent for those skilled in the art , generic principles defined herein can without departing from the spirit or scope of the present invention, Other embodiments realizes.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and It is to fit to the widest scope consistent with principles disclosed herein and features of novelty.

Claims (5)

1. a controlling hard switch machine system, it is characterised in that include power supply and current foldback circuit, switch When machine button, hardware boot-strap circuit, software shutdown circuit, hardware circuit for forced shutdown, hardware forced shutdown Between regulate circuit and key press detecting circuit, wherein:
Described power supply and current foldback circuit: realize short circuit or power consumption that late-class circuit operation irregularity is occurred During excessive phenomenon, reach the effect of power cutoff protection late-class circuit;
Described switching on and shutting down button: realize manually triggering hardware starting-up signal and manually trigger software off signal with And manual hardware forced shutdown;
Described hardware boot-strap circuit: transmit the process of starting-up signal after realizing manual trigger switch machine button;
Described hardware forced shutdown time adjustment circuit: the time realizing forced shutdown controls;
Described key press detecting circuit: realize software shutdown for controller and triggering signal is provided;
Described software shutdown circuit: provide function realizing circuit for controller output off signal;
Described hardware circuit for forced shutdown: when software shutdown was lost efficacy, reach the purpose of accurately shutdown at any time;
Described power supply and current foldback circuit are particularly as follows: power supply is adapter and battery, adapter and battery Outfan connect resettable fuse F1 by diode D20 and diode D18 respectively, described from extensive The outfan of double insurance silk F1 is connected with the source electrode of power MOS pipe U28;Described power MOS pipe U28 Source electrode be connected with its grid by resistance R150, the outfan of described power MOS pipe U28, i.e. leak Pole is connected to filter capacitor C75 and filter capacitor C77, is then connected with load;
Described switching on and shutting down button K1 is particularly as follows: its one end connecting pin 1,4 and described power MOS pipe U28 Source electrode connect, 2,3 points of three tunnels of other end connecting pin and hardware boot-strap circuit, hardware circuit for forced shutdown, The input parallel join of key press detecting circuit;
Described hardware boot-strap circuit is particularly as follows: by the connecting pin 2,3 and two of described switching on and shutting down button K1 The positive pole of pole pipe D2 connects, and described diode D2 negative pole is connected to the ground by electric capacity C158, described two poles Pipe D2 negative pole is connected also by the grid of resistance R96 with power MOS pipe U16, described power MOS Pipe U16 grid is connected to the ground by resistance R90;Described power MOS pipe U16 source ground, described The drain electrode of power MOS pipe U16 is connected with the grid of described power MOS pipe U28.
Controlling hard switch machine system the most according to claim 1, it is characterised in that described software closes electromechanics Road is particularly as follows: its one end is connected with controller I/O port, and the other end is directly connected with audion Q1 base stage, The base stage of described audion Q1 is connected to the ground by electric capacity C9, and the emitter stage of described audion Q1 directly connects Ground, the colelctor electrode of described audion Q1 is connected with diode D1 negative pole by resistance R7, described diode The positive pole of D1 is connected with VCC, and the colelctor electrode of described audion Q1 is also by resistance R151 and described merit The grid of rate metal-oxide-semiconductor U16 connects;The drain electrode of described power MOS pipe U16 and power MOS pipe U28 Grid connect, the source ground of described power MOS pipe U16.
Controlling hard switch machine system the most according to claim 2, it is characterised in that described hardware is forced to close Dynamo-electric road particularly as follows: its input is connected by the connecting pin 2,3 of resistance R155 and switching on and shutting down button K1, Described resistance R155 also crus secunda with stabilivolt U31 is connected, and described resistance R155 is also by resistance R154 It is connected with first foot of stabilivolt U31;The first of described stabilivolt U31 passes through resistance R145 ground connection, institute The 3rd foot stating stabilivolt U31 is directly grounded, and the crus secunda of described stabilivolt U31 passes through electric capacity C168 Ground connection, the crus secunda of described stabilivolt U31 is connected to ground, described stabilivolt U31 also by resistance R208 Crus secunda be connected with diode D15 also by resistance R207;The positive pole of described diode D15 and electric capacity C170 positive pole connects;Described electric capacity C170 minus earth, the positive pole of described electric capacity C170 passes through resistance R209 is connected with the 3rd foot of amplifier U9, and the positive pole of described electric capacity C170 is connected to also by electric capacity C106 Ground;3rd foot of described amplifier U9 is connected to the ground also by resistance R210, the 4th foot of described amplifier U9 Ground connection, the octal of described amplifier U9 is connected with the negative pole of diode D15, the 8th of described amplifier U9 Foot also negative pole with diode D8 and diode D9 is connected;The positive pole of described diode D8 and switching on and shutting down The connecting pin 2,3 of button K1 is connected, and the positive pole of described diode D9 is connected with VCC;Described amplifier First foot of U9 is connected with audion Q12 base stage by resistance R158;The base stage of described audion Q12 It is connected to the ground by resistance R211, the grounded emitter of described audion Q12, described audion Q12 Colelctor electrode be connected with the grid of described power MOS pipe U16;The crus secunda of described amplifier U9 is by electricity The crus secunda of resistance R213 and stabilivolt U43 is connected;The crus secunda of described stabilivolt U43 and self the Two feet are connected, and first foot of described stabilivolt U43 is also by the company of resistance R212 Yu switching on and shutting down button K1 Pin 2,3 connects;
Controlling hard switch machine system the most according to claim 3, it is characterised in that described hardware is forced to close Machine time adjustment circuit particularly as follows: belong to a part for hardware circuit for forced shutdown, its unused time t=RC, I.e. t=R207*C170.
Controlling hard switch machine system the most according to claim 4, it is characterised in that described button detection electricity Road is particularly as follows: its input passes through the base stage of resistance R124 connecting triode Q9, described audion Q9 Base stage by electric capacity C109 be connected to ground, the colelctor electrode of described audion Q9 connects VCC, described audion The emitter stage of Q9 passes through resistance R125 ground connection, and the emitter stage of described audion Q9 is also by resistance R132 Connecting the I/O port of micro-control unit MCU, the I/O port of described micro-control unit MCU passes through resistance R131 It is pulled down to ground.
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CN203965830U (en) * 2014-04-08 2014-11-26 广东宝莱特医用科技股份有限公司 A kind of controlling hard switch machine system

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