CN207182219U - It is light-operated to restart circuit - Google Patents

Abstract

The utility model discloses it is a kind of it is light-operated restart circuit, it includes the lighting detecting circuit, Time delay circuit, power switch circuit being sequentially connected；The lighting detecting circuit is used to detect outdoor illuminance, and when entering night from daytime daily, illumination is by dying down by force, when reaching trigger value, exports a high level signal；The Time delay circuit is used for the output signal for detecting lighting detecting circuit, when detecting that lighting detecting circuit exports high level signal, produces a high level pulse signal for continuing some seconds；The power switch circuit be used for after the high level pulse signal of Time delay circuit is received, will be re-closed again after power remove certain time, realization is restarted, and the power remove time held time with the high level of pulse signal it is equal.The utility model can once be automatically powered off restarted daily, without manual intervention in particular point in time according to outdoor light conditions to system.

Description

It is light-operated to restart circuit

Technical field

The utility model belongs to electronic technology field, and in particular to one kind is light-operated to restart circuit.

Background technology

In available circuit design, the anti-deadlock for CPU typically uses watchdog circuit, and watchdog circuit can sent out During raw software fault, reset signal is sent, restarts cpu reset.But for some complicated embedded system circuits, because having Substantial amounts of memory cell and peripheral circuit, when external circuit gets muddled because of external interference, only result in the feature of system Failure, and can not restart cpu reset, CPU continue to work, system can not integral reset to restart recovery normal.For one The electronic apparatus system of a little outdoor operations, multiple CPU elements be present inside it, and working environment is complicated, electromagnetic interference is serious, When multiple equipment cooperates, there is failure in one of equipment, causes system overall work abnormal, can not be automatically right System integrally carries out power-off restoration, it is necessary to artificial to go to scene to carry out power-off restarting.Therefore, we there is an urgent need to a kind of new to restart Circuit, system can be restarted automatically, to ensure the normal work of system.

Utility model content

The purpose of this utility model is to provide one kind can be according to outdoor light conditions, daily in particular point in time to being System is once automatically powered off restart light-operated and restarts circuit, to ensure system worked well.

Technical scheme is used by the utility model：

One kind is light-operated to restart circuit, system can be carried out once in particular point in time daily according to outdoor light conditions Automatically power off and restart, without manual intervention, it includes the lighting detecting circuit, Time delay circuit, power switch being sequentially connected Circuit；The lighting detecting circuit be used for detect outdoor illuminance, when entering night from daytime daily, illumination by dying down by force, When reaching trigger value, a high level signal is exported；The Time delay circuit is used for the output letter for detecting lighting detecting circuit Number, when detecting that lighting detecting circuit exports high level signal, produce a high level pulse signal for continuing some seconds；Institute State power switch circuit to be used for after the high level pulse signal of Time delay circuit is received, after power remove certain time Re-close again, realization is restarted, and the power remove time held time with the high level of pulse signal it is equal.

By such scheme, the lighting detecting circuit includes photo resistance R2, resistance R1, voltage comparator U1A, feedback electricity R6, resistance R3, resistance R4, resistance R7, photo resistance R2 one end ground connection are hindered, the photo resistance R2 other end is connected with resistance R1 Power supply VCC is followed by, the photo resistance R2 other end is connected with voltage comparator U1A in-phase input end, voltage comparator U1A's In-phase input end is connected by feedback resistance R6 with voltage comparator U1A output end, voltage comparator U1A inverting input It is grounded after being connected with resistance R3, voltage comparator U1A inverting input is connected with resistance R4 one end, the resistance R4 other end One end with power supply VCC and resistance R7 is connected respectively, and the resistance R7 other end is connected with voltage comparator U1A output end.Light Quick resistance R2 and resistance R1 form bleeder circuit, and intensity of illumination is converted into the same phase that magnitude of voltage is input to voltage comparator U1A Input；Resistance R3 and R4 form bleeder circuit, are input to voltage comparator U1A inverting input, there is provided reference voltage.

By such scheme, the Time delay circuit includes monostable flipflop U3, electric capacity C1, resistance R8, and monostable is touched Hair device U3 IB pins are connected with voltage comparator U1A output end, and monostable flipflop U3 1CEXT pins pass through electric capacity C1 It is connected with monostable flipflop U3 1REXT pins, and monostable flipflop U3 1CEXT pins ground connection；Monostable flipflop U3 1/CD pins are connected by resistance R8 with monostable flipflop U3 1REXT pins, and monostable flipflop U3 1/CD Pin meets power supply VCC；Monostable flipflop U3 1Q pins are connected with power switch circuit.Monostable flipflop U3 model Monostable flipflop CD4528, rising edge signal is converted into high level pulse signal output.Electric capacity C1 and resistance R8 is used to adjust Section output high-level pulse width, generally 3 ~ 10 seconds.

By such scheme, the power switch circuit includes current-limiting resistance R5, optocoupler U2, transistor Q1, triode Q2, steady Press diode D1；Current-limiting resistance R5 one end is connected with Time delay circuit, and the current-limiting resistance R5 other end is defeated with optocoupler U2's Enter end connection, optocoupler U2 output end is connected by pull-up resistor R9 with transistor Q1 source electrode, and optocoupler U2 output end passes through Resistance R10 is connected with triode Q2 base stage, and transistor Q1 source electrode is connected with power supply, and transistor Q1 source electrode passes through voltage stabilizing two Pole pipe D1 is connected with transistor Q1 grid, and voltage-regulator diode D1 is in parallel with resistance R11, and transistor Q1 drain electrode and load connect After be grounded, transistor Q1 grid is connected by resistance R12 with triode Q2 colelctor electrode, triode Q2 grounded emitter. Transistor Q1 is pmos type transistor, controls cut-offfing for power supply；Pull-up resistor R9, resistance R10, resistance R11, resistance R12 and Triode Q2 composition transistors Q1 drive circuit, voltage-regulator diode D1 are transistor Q1 protection element；Current-limiting resistance R5 and Optocoupler U2 realizes signal transmission and buffer action.

The utility model is converted to when illuminance is by dying down by force by detecting outdoor illuminance and restarts trigger signal, can Restarted once with daily disconnecting the power supply of load, the hot restart than existing watchdog circuit is more secure, resets more reliable； Light-operated mode causes load to enter the time completion power-off restarting at night on daytime daily, and the time restarted has regularity；This The electronic equipment and timing power-off restarting that utility model can ensure that some requirement of real-time are not high, easily be disturbed, realize Automatically restoring fault, without manual intervention.

Brief description of the drawings

Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：

Fig. 1 is the light-operated circuit diagram for restarting circuit of the utility model.

Embodiment

In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this Utility model, it is not used to limit the utility model.

Referring to Fig. 1, one kind is light-operated to restart circuit, can be according to outdoor light conditions, daily in particular point in time to system Once automatically powered off and restarted, without manual intervention, it includes lighting detecting circuit 100, the Time delay electricity being sequentially connected Road 200, power switch circuit 300；Lighting detecting circuit 100 is used to detect outdoor illuminance, enters night from daytime when daily When, illumination is by dying down by force, when reaching trigger value, exports a high level signal；Time delay circuit 200 is used for detection light according to inspection The output signal of slowdown monitoring circuit, when detecting that lighting detecting circuit exports high level signal, produce a height for continuing some seconds Level pulse signal；Power switch circuit 300 is used for after the high level pulse signal of Time delay circuit is received, by power supply Re-closed again after shut-off certain time, realization is restarted, and the high level of the power remove time and pulse signal is held time It is equal.

In lighting detecting circuit 100, a resistance R1 termination power VCC, the resistance R1 other end and photo resistance R2's One end is connected, and photo resistance R2 other ends ground connection GND, forms bleeder circuit, its series connection point connects the same mutually defeated of voltage comparator U1A Enter end（Pin 3）, height of voltage changes with illumination is strong and weak at this；After resistance R3 and resistance R4 series connection, one termination power VCC, its other end ground connection GND, its series connection point connect voltage comparator U1A inverting input（Pin 2）, one is provided surely for it Fixed reference voltage；Feedback resistance R6 one end and voltage comparator U1A in-phase input end（Pin 3）Connection, feedback resistance The R6 other end and voltage comparator U1A output end（Pin 1）Connection, plays Anti-Jamming；Resistance R7 be voltage ratio compared with Device U1A output end（Pin 1）Pull-up resistor between power supply VCC so that the output of voltage comparator possesses certain driving Ability；Under daylight environment, illumination is stronger, and photo resistance R2 resistance is smaller, and partial pressure is relatively low so that voltage comparator U1A's Homophase input terminal voltage is less than inverting input, exports low level；When entering night, illumination dies down, photo resistance R2 on daytime Resistance increase therewith, partial pressure uprises so that voltage comparator U1A homophase input terminal voltage gradually higher than inverting input electricity Pressure, output switching activity is high level, produces a rising edge signal, is output to Time delay circuit 200；Enter daytime when night When, illumination becomes by force again, and photo resistance R2 resistances reduce, and voltage comparator U1A in-phase input end voltage reduces, until less than anti- Phase input, recover low level output, be now trailing edge signal, the action of Time delay circuit 200 will not be caused.

In Time delay circuit 200, monostable flipflop U3 model monostable flipflop CD4528, by power supply VCC Power supply is provided；Electric capacity C1 one end order steady state trigger U3 1CEXT pins（Pin 1）, electric capacity C1 other end order is steady State trigger U3 1REXT pins（Pin 2）, resistance R8 one end order steady state trigger U3 1/CD pins（Pin 3）, electricity Hinder R8 another termination 1REXT pins（Pin 2）, pass through discharge and recharge, the pulse of regulation monostable flipflop U3 output high level Width；During actual use, typically high-level pulse width was adjusted to 3 ~ 10 seconds；Monostable flipflop U3 1B pins（Pin 4）Connect signal input（That is the output end of monostable flipflop U3 1B pins and the voltage comparator U1A of lighting detecting circuit 100 （Pin 1）Connection）, monostable flipflop U3 1Q pins（Pin 6）For signal output, only when detecting a rising edge letter Number when, its 1Q pin（Pin 6）Output high level is changed into from low level, after being kept for a period of time, then recover low level；High electricity The flat retention time is determined by above-mentioned electric capacity C1 and resistance R8.

After power switch circuit 300 receives the high level pulse of Time delay circuit 200, by current-limiting resistance R5, enter Enter optocoupler U2 input, signal isolation is produced a same high level pulse signal by optocoupler U2 in output end；Transistor Q1 is PMOS transistor, is responsible for cut-offfing for control load power source, and its source class connects input power, and drain electrode connects load；Transistor Q1's Grid is pulled to input power by resistance R11, while voltage-regulator diode D1 is in parallel with resistance R11, shields, and limits grid It is no more than device parameters with the pressure difference of source electrode；Triode Q2 grounded emitter, colelctor electrode connect transistor Q1's by resistance R12 Grid, base stage connect optocoupler U2 output end by current-limiting resistance R10, and are connected to pull-up resistor R9；When optocoupler U2 input signals are During low level, optocoupler U2 output pins 4 are floating state, and now power supply drives triode by pull-up resistor R9 and resistance R10 Q2 is turned on, and transistor Q1 grid voltage is pulled low, and causes grid and source electrode voltage difference to be present so that transistor Q1 is turned on, and is born Carry and obtain power input, normal work；After optocoupler U2 receives the high level signal of Time delay circuit 200, optocoupler U2's Pin 4 is pulled to low level, and triode Q2 shut-offs, transistor Q1 grid is pulled up by resistance R11, equal with source voltage, does not have There is voltage difference so that transistor Q1 is turned off, and load is unplugged；When the high level signal of Time delay circuit 200 continues one Low level is returned to after the section time again, optocoupler U2 pin 4 recovers floating state, triode Q2 conductings, transistor Q1 conductings, born Load regains power supply, is successfully made and once restarts.

It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted, And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.

Claims (4)

1. one kind is light-operated to restart circuit, it is characterised in that：Including

For detecting outdoor illuminance, when entering night from daytime daily, illumination is by dying down by force, when reaching trigger value, output The lighting detecting circuit of one high level signal；

For detecting the output signal of lighting detecting circuit, when detecting that lighting detecting circuit exports high level signal, produce The Time delay circuit of one high level pulse signal for continuing some seconds；

For after the high level pulse signal of Time delay circuit is received, will be re-closed again after power remove certain time Power switch circuit, the power remove time holds time equal with the high level of pulse signal.

Light-operated restart circuit 2. according to claim 1, it is characterised in that：The lighting detecting circuit includes photo resistance R2, resistance R1, voltage comparator U1A, feedback resistance R6, resistance R3, resistance R4, resistance R7, photo resistance R2 one end ground connection, The photo resistance R2 other end is connected with resistance R1 is followed by power supply VCC, and the photo resistance R2 other end is with voltage comparator U1A's In-phase input end connects, and voltage comparator U1A in-phase input end passes through feedback resistance R6 and voltage comparator U1A output end Connection, voltage comparator U1A inverting input are grounded after being connected with resistance R3, voltage comparator U1A inverting input and Resistance R4 one end connection, the one end of the resistance R4 other end respectively with power supply VCC and resistance R7 are connected, the resistance R7 other end It is connected with voltage comparator U1A output end.

Light-operated restart circuit 3. according to claim 1, it is characterised in that：The Time delay circuit touches including monostable Hair device U3, electric capacity C1, resistance R8, monostable flipflop U3 IB pins are connected with voltage comparator U1A output end, monostable Trigger U3 1CEXT pins are connected by electric capacity C1 with monostable flipflop U3 1REXT pins, and monostable flipflop U3 1CEXT pins ground connection；The 1REXT pins that monostable flipflop U3 1/CD pins pass through resistance R8 and monostable flipflop U3 Connection, and monostable flipflop U3 1/CD pins meet power supply VCC；Monostable flipflop U3 1Q pins and power switch circuit Connection.

4. described light-operated restart circuit according to any in claim 1-3, it is characterised in that：The power switch circuit includes Current-limiting resistance R5, optocoupler U2, transistor Q1, triode Q2, voltage-regulator diode D1；Current-limiting resistance R5 one end and Time delay electricity Road connects, and the current-limiting resistance R5 other end is connected with optocoupler U2 input, optocoupler U2 output end by pull-up resistor R9 and Transistor Q1 source electrode connection, optocoupler U2 output end are connected by resistance R10 with triode Q2 base stage, transistor Q1 source Pole is connected with power supply, and transistor Q1 source electrode is connected by voltage-regulator diode D1 with transistor Q1 grid, voltage-regulator diode D1 In parallel with resistance R11, with being grounded after load connection, transistor Q1 grid passes through resistance R12 and three poles for transistor Q1 drain electrode Pipe Q2 colelctor electrode connection, triode Q2 grounded emitter.