CN208752571U

CN208752571U - A kind of on/off circuit with forced shutdown function

Info

Publication number: CN208752571U
Application number: CN201821525588.2U
Authority: CN
Inventors: 陈亮
Original assignee: Shenzhen Rongpin Electronic Technology Co Ltd
Current assignee: Shenzhen Rongpin Electronic Technology Co Ltd
Priority date: 2018-09-18
Filing date: 2018-09-18
Publication date: 2019-04-16
Anticipated expiration: 2028-09-18

Abstract

The utility model discloses a kind of on/off circuits with forced shutdown function, comprising: key, on/off circuit and pressure power-down circuit；On/off circuit is respectively with key, and power module, CPU module and force switch machine circuit connection, the control foot of power module connect with circuit for forced shutdown and CPU module；Power module operates normally after key is pressed and output voltage is to CPU module, and CPU module persistently exports high level signal and operates normally；CPU module detects that key triggers again, and prior notice is closed after the program of operation, persistently exports low level and normal shutdown；Circuit for forced shutdown is used for after long-pressing key, and the level of power module is dragged down, and forces power module shutdown, system is made to return to off-mode.Technical solutions of the utility model are simple and practical, with operation power module powers off again after the application program of operation in closing system in advance, damage device and system file avoided to lose.

Description

A kind of on/off circuit with forced shutdown function

Technical field

It is the utility model relates to the switching on and shutting down technical field of electronic equipment, in particular to a kind of with forced shutdown function On/off circuit.

Background technique

Mainly for the electronic equipment for having Android system, 12V~36V voltage model state applies in the majority, the higher output of voltage Power is bigger, and line loss is smaller, and the cutting type switch or rocker type switch that major applications scenes uses force equipment Shutdown is realized in power-off, and such mode of operation is bound to bring the plank with operating system many unpredictable problems, peace Tall and erect system just in high-speed cruising and biography data, forces to power off, is easy to cause loss of data and device failure to it.

Utility model content

Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide one kind to have forced shutdown function The on/off circuit of energy avoids damaging so that operation power module powers off again after the application program of operation in closing system in advance Device and system file are lost.

To achieve the above object, a kind of on/off circuit with forced shutdown function, for controlling power module to CPU Module for power supply, comprising: key, on/off circuit and pressure power-down circuit；The on/off circuit is described respectively with the key Power module, the CPU module and the force switch machine circuit connection, the control foot of the power module and the pressure are closed Electromechanical road is connected with the CPU module；The power module operates normally after the key is pressed and output voltage is to institute CPU module is stated, the CPU module persistently exports high level signal and operates normally；The CPU module detects the key again Secondary triggering, prior notice are closed after the program of operation, and low level and normal shutdown are persistently exported；The circuit for forced shutdown is used After the key described in long-pressing, the level of the power module is dragged down, forces the power module to shut down, is restored to system Originate off-mode.

Preferably, the on/off circuit include: first diode, the first field-effect tube, first resistor, second resistance, 3rd resistor, the 4th resistance and the first triode；The cathode of the first diode and the key and the CPU module The connection of INT foot, the key other end are connected to ground, the positive collection with first triode respectively of the first diode Electrode is connected with the grid of first field-effect tube, the base stage of first triode by the 3rd resistor with it is described The LOCK foot of CPU module connects, the emitter ground connection of first triode；The anode of the first diode is by described the Two resistance are connect with the source electrode of the first field-effect tube, and the drain electrode of first field-effect tube connects with one end of the first resistor It connects, the other end of the first resistor is connect with one end of the power module and the 4th resistance respectively, the 4th electricity The other end of resistance is grounded.

Preferably, the circuit for forced shutdown includes: the second field-effect tube, the second diode, the 5th resistance, the 6th resistance And capacitor；The drain electrode of second field-effect tube is connected to ground, and the source electrode and the power module of second field-effect tube connect Connect, the grid of second field-effect tube respectively with the cathode of second diode, one end of the capacitor and the described 5th Resistance connection, positive one end with the 5th resistance respectively of second diode, one end of the 6th electronics and institute State the cathode connection of first diode, the other end of the 5th resistance connect with one end of the capacitor, the capacitor it is another Respectively with the second resistance, the 6th resistance connects with the source electrode of first field-effect tube for one end.

Compared with prior art, the utility model by by trigger-type key realize startup and shutdown, in system in case of system halt When, it can be discharged by long-pressing key, capacitor by the 5th resistance (current-limiting resistance), make the low electricity of the grid of the second field-effect tube Flat, the conducting of the second field-effect tube drags down the level of the control foot of power module, power module power-off shutdown；When unclamping key, Input current can quickly be charged to circuit by the 6th resistance and the second diode, and the second field-effect tube is allowed to keep closing rapidly Closed state.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the electrical block diagram of the utility model；

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

Specific embodiment

As shown in Figure 1；A kind of on/off circuit with forced shutdown function that the present embodiment proposes, for controlling power supply Module is powered to CPU module, comprising: key K1, on/off circuit and pressure power-down circuit；On/off circuit respectively with key K1, power module, CPU module and force switch machine circuit connection, the control foot and circuit for forced shutdown and CPU mould of power module Block connection；Power module operates normally after key K1 is pressed and output voltage is to CPU module, and CPU module persistently exports height Level signal simultaneously operates normally；CPU module detects that key K1 is triggered again, and prior notice is closed after the program of operation, holds Continuous output low level and normal shutdown；Circuit for forced shutdown is used for after long-pressing key K1, the level of power module is dragged down, by force Power module shutdown processed, makes system return to off-mode.

The utility model provides a kind of on/off circuit with forced shutdown function, in closing system in advance Operation power module powers off again after the application program of operation, and damage device and system file is avoided to lose.

In the utility model embodiment, on/off circuit includes: first diode D1, the first field-effect tube Q1, first Resistance R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and the first triode Q3；The cathode of first diode D1 with press Key K1 is connected with the INT foot of CPU module, and the key K1 other end is connected to ground, and the anode of first diode D1 is respectively with the one or three The connection of the grid of the collector of pole pipe Q3 and the first field-effect tube Q1, the base stage of the first triode Q3 by 3rd resistor R3 with The LOCK foot of CPU module connects, the emitter ground connection of the first triode Q3；The anode of first diode D1 passes through second resistance R2 It is connect with the source electrode of the first field-effect tube Q1, the drain electrode of the first field-effect tube Q1 is connect with one end of first resistor R1, the first electricity The other end of resistance R1 is connect with one end of power module and the 4th resistance R4 respectively, the other end ground connection of the 4th resistance R4.

In the utility model embodiment, circuit for forced shutdown includes: the second field-effect tube Q2, the second diode D2, Five resistance R5, the 6th resistance R6 and capacitor C1；The drain electrode of second field-effect tube Q2 is connected to ground, the source electrode of the second field-effect tube Q2 Connect with power module, the grid of the second field-effect tube Q2 respectively with the cathode of the second diode D2, one end of capacitor C1 and Five resistance R5 connections, positive one end with the 5th resistance R5 respectively of the second diode D2, one end and the one or two of the 6th electronics The cathode of pole pipe D1 connects, the other end of capacitor C1 respectively with second resistance R2, the 6th resistance R6 and the first field-effect tube Q1 Source electrode connection.

On/off circuit working principle:

When equipment needs to be switched on, the first field-effect tube Q1 is off state, and power module in a dormant state, works as key When K1 is pressed, first diode D1 has a unilateral conduction, and electric current, which by first diode D1 flows to key K1 and directly arrives, to be connect Ground, the grid of the first field-effect tube Q1 is low level at this time, and the first field-effect tube Q1 conducting, source current, which flows to, to drain, and Obtain two by the partial pressure of first resistor R1 and the 4th resistance R4/ voltage (6V) flow to the control foot of power module, at this time Power module is normally-open and output voltage is powered to CPU module, holds preset GPIO all the way mouthfuls of output after CPU operation Continuous high level signal, is connected to the base stage of the first triode Q3 by 3rd resistor R3, the current direction emitter-base bandgap grading of collector, and The grid of one field-effect tube Q1 still remains low level, and system has operated normally at this time.When equipment needs to shut down, press by Key K1, the foot of detection all the way of CPU module pass through the detection trigger of key K1, and prior notice system closes the program being currently running Afterwards, low level being set by software by the IO foot of LOCK, the first triode Q3 and the first field-effect tube Q1 are off state, The control foot of power module is low level, at this time system normal shutdown

The working principle of circuit for forced shutdown:

The electronic equipment with operating system is bound to have probabilistic appearance to crash as existing in the process of running in the market (stuck), when machine crash after, length press & hold K17 seconds or more, the 5th resistance R5 in circuit for forced shutdown to capacitor C1 into Row electric discharge (resistance value of the 5th resistance R5 is bigger, hinders the time of capacitor C1 electric discharge longer), capacitor C1 can pass through the 5th resistance R5 Electric discharge is completed over the ground, second suburb should the grid of pipe be 0 volt of low level, the second field-effect tube Q2 conducting, by the control of power module The level of foot processed drags down, and power module power-off, system returns to off-mode, when unclamping key K1, input current meeting By the 6th resistance R6, the second diode D2 quickly charges to capacitor C1, and the second field-effect tube Q2 is allowed to remain turned-off rapidly State.

The utility model can lead to and realize booting, shutdown by trigger-type key K1；System in case of system halt, can be elongated Key K1, forced shutdown；The forced shutdown time can be set by modifying the resistance value of capacitor C1.

Above therefore it does not limit the scope of the patent of the utility model, all using in the utility model specification and attached drawing Equivalent structure or equivalent flow shift made by holding, is applied directly or indirectly in other relevant technical fields, and similarly wraps It includes in the scope of patent protection of the utility model.

Claims

1. a kind of on/off circuit with forced shutdown function is powered for controlling power module to CPU module, feature exists In, comprising: key, on/off circuit and pressure power-down circuit；The on/off circuit respectively with the key, the power supply mould Block, the CPU module and the force switch machine circuit connection, the control foot and the circuit for forced shutdown of the power module It is connected with the CPU module；The power module operates normally after the key is pressed and output voltage is to the CPU mould Block, the CPU module persistently export high level signal and operate normally；The CPU module detects that the key triggers again, Prior notice is closed after the program of operation, and low level and normal shutdown are persistently exported；The circuit for forced shutdown is used in length After the key, the level of the power module is dragged down, forces the power module to shut down, system is made to return to close Machine state.

2. as described in claim 1 with the on/off circuit of forced shutdown function, which is characterized in that the on/off circuit It include: first diode, the first field-effect tube, first resistor, second resistance, 3rd resistor, the 4th resistance and the first triode； The cathode of the first diode is connect with the INT foot of the key and the CPU module, and the key other end and ground are even It connects, the anode of the first diode connects with the collector of first triode and the grid of first field-effect tube respectively It connects, the base stage of first triode is connect by the 3rd resistor with the LOCK foot of the CPU module, the one or three pole The emitter of pipe is grounded；The anode of the first diode is connect by the second resistance with the source electrode of the first field-effect tube, The drain electrode of first field-effect tube is connect with one end of the first resistor, the other end of the first resistor respectively with it is described Power module is connected with one end of the 4th resistance, the other end ground connection of the 4th resistance.

3. as claimed in claim 2 with the on/off circuit of forced shutdown function, which is characterized in that the forced shutdown electricity Road includes: the second field-effect tube, the second diode, the 5th resistance, the 6th resistance and capacitor；The drain electrode of second field-effect tube It is connected to ground, the source electrode of second field-effect tube is connect with the power module, the grid difference of second field-effect tube It is connect with the cathode of second diode, one end of the capacitor and the 5th resistance, the anode of second diode Respectively with one end of the 5th resistance, one end of the 6th resistance connects with the cathode of the first diode, the electricity Respectively with the second resistance, the 6th resistance connects the other end of appearance with the source electrode of first field-effect tube.