CN110224372A - A kind of overvoltage crowbar being adapted to twin voltage - Google Patents
A kind of overvoltage crowbar being adapted to twin voltage Download PDFInfo
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- CN110224372A CN110224372A CN201910486699.XA CN201910486699A CN110224372A CN 110224372 A CN110224372 A CN 110224372A CN 201910486699 A CN201910486699 A CN 201910486699A CN 110224372 A CN110224372 A CN 110224372A
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- 238000005070 sampling Methods 0.000 claims abstract description 33
- 230000033228 biological regulation Effects 0.000 claims abstract description 29
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- 239000003990 capacitor Substances 0.000 claims description 37
- 239000003381 stabilizer Substances 0.000 claims description 23
- 230000005611 electricity Effects 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000005283 ground state Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
Abstract
The invention discloses the overvoltage crowbars that one kind can be adapted to twin voltage; including direct current regulation circuit, reference voltage circuit, pressure sampling circuit, comparison circuit and relay protection circuit; pressure sampling circuit includes toggle switch; relay protection circuit includes relay, switching tube Q2, switching tube Q3, switching tube Q4 and MCU; the on-off for the control Signal-controlled switch pipe Q4 that MCU is exported according to comparison circuit, and then the on-off of relay is controlled to control the on-off of load circuit；The on-off for the control Signal-controlled switch pipe Q3 that switching tube Q2 is exported according to comparison circuit, and then the on-off of relay is controlled to control the on-off of load circuit.Compared with prior art, the soft protection of over-voltage can be achieved at the same time in the present invention and over-voltage is protected firmly；And the resistance value of resistor network in pressure sampling circuit can be changed by toggle switch to change the sampled voltage of pressure sampling circuit output, overvoltage protection purpose is carried out to reach circuit and can be adapted to twin voltage.
Description
Technical field
The present invention relates to applications of electronic circuitry technical fields, more particularly to a kind of overvoltage protection electricity that can be adapted to twin voltage
Road.
Background technique
In electronic application field, in order to meet safety and reinforce electronic equipment protection, more and more electrical equipments are needed
Increased overvoltage crowbar.For electric main appliance field, current most design schemes all use tradition
A series of signal processing such as alternating voltage partial pressure sampling-inversion-signal processing-software-driven protection to realize to high current
The overvoltage protection of load.
Program comparative maturity, but this system schema belongs to soft protection, is carried out by signal of the chip MCU to acquisition
Driving operation is carried out to driving circuit after reason, judgement, belongs to soft protection in technological layer, can not pass through American-European some big customers'
High-end safety requirement, system will often increase pure hard protection circuit and reach security level this when.Still further aspect is based on MCU
Soft protection can face a problem be in rugged environment software systems have it is unstable in addition crash risk.
Summary of the invention
Technical problem to be solved by the present invention lies in a kind of overvoltage crowbar that can be adapted to twin voltage is provided, this can be fitted
The soft protection of over-voltage can be achieved at the same time in overvoltage crowbar with twin voltage and over-voltage is protected firmly, and can be changed by toggle switch
The size of divider resistance in pressure sampling circuit, so that changing input threshold values reaches the optional overvoltage protection purpose of twin voltage.
In order to solve the above technical problems, the present invention uses technical solution as described below:
A kind of overvoltage crowbar being adapted to twin voltage comprising have a direct current regulation circuit, a reference voltage circuit,
One pressure sampling circuit, a comparison circuit and a relay protection circuit.The direct current regulation circuit, be used for alternating current into
Row decompression, rectification, steady pressure treatment, and a stable DC is exported in output end；The reference voltage circuit is used for from institute
The output end for stating direct current regulation circuit takes electricity, and mentions after dividing to the output end voltage of direct current regulation circuit for comparison circuit
For a reference voltage；The pressure sampling circuit is used to take electricity from external ac power source, and carries out to collected alternating current
A sampled voltage is provided for comparison circuit after rectification, partial pressure, which is connected with a toggle switch, the toggle switch
For the resistance value by changing the pressure sampling circuit internal resistance network to change adopting for the pressure sampling circuit output
Sample voltage；The comparison circuit is used for the sampled voltage compared with reference voltage carries out voltage, and defeated according to comparison result
Control signal accordingly out；The relay protection circuit comprising have relay, switching tube Q2, switching tube Q3, switching tube Q4
And the control signal that MCU, the MCU are exported according to the comparison circuit controls the on-off of the switching tube Q4, and then controls institute
The on-off of relay is stated to control the on-off of load circuit；The control signal that the switching tube Q2 is exported according to the comparison circuit
The on-off of the switching tube Q3 is controlled, and then controls the on-off of the relay to control the on-off of load circuit.
Preferably, an isolation circuit is also connected between the comparison circuit and the relay protection circuit.
Preferably, the isolation circuit includes optocoupler U2, NPN triode Q1, resistance R11, resistance R12 and resistance R13,
One end of the resistance R11 is connect with the output end of the direct current regulation circuit, the other end simultaneously with the output end of comparison circuit,
One end of resistance R12 connects, and the other end of resistance R12 is connect with the base stage of triode Q1, one end of the resistance R13 with it is described
The output end of direct current regulation circuit connects, and the other end is connect with the anode of the luminous tube of the optocoupler U2, the luminous tube of optocoupler U2
Cathode connect with the collector of triode Q1, the photosensitive pipe collector of the emitter of triode Q1 ground connection, optocoupler U2 passes through one
Resistance R14 is connect with VCC power supply, the emitter ground connection of the photosensitive tube of optocoupler U2.
Preferably, the switching tube Q2, switching tube Q4 are NPN triode, and switching tube Q3 is PNP triode；The relay
It further includes having diode D4, resistance R15, resistance R16, resistance R17, resistance R18 and MCU that device, which protects circuit,；The detection of the MCU
Foot is connect by resistance R15 with the collector of the photosensitive tube of optocoupler U2, and the control foot of MCU passes through resistance R18's and triode Q4
Base stage connection；The base stage of triode Q2 is connect with the collector of the photosensitive tube of optocoupler U2, emitter ground connection, collector respectively with electricity
Hinder one end connection of R16, resistance R17；The other end of resistance R17 and the base stage of triode Q3, the other end of resistance R16, three poles
The collector of pipe Q3 is connect with 12V power supply, the emitter of triode Q3 simultaneously with the cathode of diode D4, the coil of relay
One end connection, the anode of diode D4, the other end of the coil of relay RL1 are connect with the collector of triode Q4 simultaneously, and three
The emitter of pole pipe Q4 is grounded, and the fixed contact of relay and the power supply positive input of load connect, the activity touching of relay
Point is connect with exchange firewire.
Preferably, a delay Anti-shaking circuit is also connected between the comparison circuit and isolation circuit, the delay stabilization electricity
Road exports the control signal of the comparison circuit for being delayed.
Preferably, the delay Anti-shaking circuit includes amplifier U3B, resistance R8, resistance R9, resistance R10 and capacitor EC2,
One end of resistance R8 is connect with the output end of the direct current regulation circuit, the other end while anode, amplifier U3B with capacitor EC2
Normal phase input end connected with the output end of comparison circuit, the cathode of capacitor EC2 ground connection, one end of resistance R9 and the direct current are steady
The output end of volt circuit connects, and the other end is connect with one end of the inverting input terminal of amplifier U3B, resistance R10 simultaneously, resistance R10
The other end ground connection.
Preferably, the direct current regulation circuit includes resistance R1, capacitor CX1, capacitor EC1, diode D1, diode
D2, voltage-stabiliser tube Z1 and voltage-stabiliser tube U1, the input terminal of the voltage-stabiliser tube U1 yin with the cathode of diode D1, diode D2 respectively
The cathode connection of pole, voltage-stabiliser tube Z1, the anode of diode D1 are connected by capacitor CX1 and the firewire of external ac power source, resistance
R1 is in parallel with the capacitor CX1, capacitor EC1 anode connect with the output end of the voltage-stabiliser tube U1, the anode of diode D2, surely
The cathode of the anode of pressure pipe Z1, the ground terminal of voltage-stabiliser tube U1 and capacitor EC1 is grounded.
Preferably, the reference voltage circuit includes resistance R6 and resistance R7, and one end of resistance R6 and the direct current are steady
The output end of volt circuit connects, and the other end is grounded by resistance R7, connecting node and institute between the resistance R6 and resistance R7
State the input terminal connection of comparison circuit.
Preferably, the pressure sampling circuit includes diode D3, resistance R2, resistance R3, resistance R4, the diode
The anode of D3 and the firewire of external ac power source connect, after the cathode of triode D3 is sequentially connected in series resistance R2, resistance R3, resistance R4
Ground connection, the toggle switch is in parallel with the resistance R3, and the connecting node between the resistance R3 and resistance R4 is compared with described
Circuit connection.
Preferably, the comparison circuit include include amplifier U3A, the normal phase input end of amplifier U3A is connected to institute
The output end of pressure sampling circuit is stated, inverting input terminal is connected to the output end of the reference voltage circuit.
The beneficial technical effect of the present invention lies in: the present invention includes a direct current regulation circuit, a reference voltage circuit, one
Pressure sampling circuit, a comparison circuit and a relay protection circuit, the pressure sampling circuit are connected with a toggle switch, should
Toggle switch is used for the resistance value by changing the pressure sampling circuit internal resistance network to change the pressure sampling circuit
The sampled voltage of output；The relay protection circuit include relay, switching tube Q2, switching tube Q3, switching tube Q4 and
The control signal that MCU, the MCU are exported according to the comparison circuit controls the on-off of the switching tube Q4, and then described in control
The on-off of relay is to control the on-off of load circuit；The control signal control that the switching tube Q2 is exported according to the comparison circuit
The on-off of the switching tube Q3 is made, and then controls the on-off of the relay to control the on-off of load circuit.With the prior art
It compares, the soft protection of over-voltage can be achieved at the same time in the present invention and over-voltage is protected firmly；And partial pressure sampling can be changed by toggle switch
The resistance value size of circuit internal resistance network is to change the sampled voltage that the pressure sampling circuit exports, to reach circuit energy
Enough adaptation twin voltages carry out overvoltage protection purpose, and when accessing the AC power source of two different voltages, circuit may be implemented
Overvoltage protection, it can the AC power source of two different voltages of adaptation.
Detailed description of the invention
Fig. 1 is the circuit diagram for the overvoltage crowbar that the present invention can be adapted to twin voltage.
Specific embodiment
To make those skilled in the art that the object, technical solutions and advantages of the present invention be more clearly understood, with
Under the present invention is further elaborated in conjunction with the accompanying drawings and embodiments.
As shown in Figure 1, in an embodiment of the invention, the overvoltage crowbar of twin voltage can be adapted to comprising have one
Direct current regulation circuit 10, a reference voltage circuit 20, a pressure sampling circuit 30, a comparison circuit 40 and relay protection electricity
Road 50.The direct current regulation circuit 10, is used to be depressured alternating current, rectify, steady pressure treatment, and exports one in output end
Stable DC.The reference voltage circuit 20 is used to take electricity from the output end of the direct current regulation circuit 10, and to straight
The output end voltage of stream voltage regulator circuit 10 is that comparison circuit 40 provides a reference voltage after being divided.The pressure sampling circuit
30, it is used to take electricity from external ac power source, and provide after collected alternating current is rectified, divided for comparison circuit 40
One sampled voltage；The pressure sampling circuit is connected with a toggle switch, which is used for by changing the partial pressure sampling
The resistance value of 30 internal resistance network of circuit is to change the sampled voltage that the pressure sampling circuit 30 exports.The comparison circuit
40, for exporting corresponding control signal compared with reference voltage carries out voltage, and according to comparison result to the sampled voltage.
The relay protection circuit 50 comprising there are relay RL1, switching tube Q2, switching tube Q3, switching tube Q4 and MCU, it is described
The control signal that MCU is exported according to the comparison circuit 40 controls the on-off of the switching tube Q4, and then controls the relay
The on-off of RL1 is to control the on-off of load circuit；The control signal control that the switching tube Q2 is exported according to the comparison circuit 40
The on-off of the switching tube Q3 is made, and then controls the on-off of the relay RL1 to control the on-off of load circuit.
Preferably, the overvoltage crowbar that can be adapted to twin voltage further includes having an isolation circuit 60 and a delay Anti-shaking circuit
70。
The direct current regulation circuit 10 includes resistance R1, capacitor CX1, capacitor EC1, diode D1, diode D2, pressure stabilizing
Pipe Z1 and voltage-stabiliser tube U1, the input terminal of the voltage-stabiliser tube U1 respectively with the cathode of diode D1, the cathode of diode D2, voltage-stabiliser tube
The cathode of Z1 connects, and the anode of diode D1 is connected by capacitor CX1 and the firewire of external ac power source, resistance R1 and the electricity
Hold that CX1 is in parallel, the anode of capacitor EC1 is connect with the output end of the voltage-stabiliser tube U1, the sun of the anode of diode D2, voltage-stabiliser tube Z1
The cathode of pole, the ground terminal of voltage-stabiliser tube U1 and capacitor EC1 is grounded.
The reference voltage circuit 20 includes resistance R6 and resistance R7, one end of resistance R6 and the direct current regulation circuit
10 output end connection, the other end are grounded by resistance R7, the connecting node between the resistance R6 and resistance R7 and the ratio
It is connected compared with circuit 40,40 outputting reference voltage of Xiang Suoshu comparison circuit.
The pressure sampling circuit 30 includes diode D3, resistance R2, resistance R3, resistance R4 and toggle switch SW1, institute
State diode D3 anode and external ac power source firewire connect, the cathode of triode D3 be sequentially connected in series resistance R2, resistance R3,
It is grounded after resistance R4, the toggle switch SW1 is in parallel with the resistance R3, the connecting node between the resistance R3 and resistance R4
It is connect with the comparison circuit 40, Xiang Suoshu comparison circuit 40 exports sampled voltage.The pressure sampling circuit 30 further includes having
Capacitor C1, resistance R5 and capacitor C2, the capacitor C1, resistance R5 and capacitor C2 constitute π type filter circuit, guarantee the sampling of input
The smooth steady of voltage.
The comparison circuit 40 includes amplifier U3A, and the normal phase input end (3 foot) of amplifier U3A is connected to the partial pressure
The output end of sample circuit 30, inverting input terminal (2 foot) are connected to the output end of the reference voltage circuit 20.
The delay Anti-shaking circuit 70 includes amplifier U3B, resistance R8, resistance R9, resistance R10 and capacitor EC2, resistance R8
One end connect with the output end of the direct current regulation circuit 10, the other end simultaneously with the anode of capacitor EC2, amplifier U3B just
The output end (1 foot) of phase input terminal (5 foot) and amplifier U3A connection, capacitor EC2 cathode ground connection, one end of resistance R9 with it is described
The output end of direct current regulation circuit 10 connects, the other end while one end with the inverting input terminal (6 foot) of amplifier U3B, resistance R10
Connection, the other end ground connection of resistance R10.
The isolation circuit 60 includes optocoupler U2, NPN triode Q1, resistance R11, resistance R12 and resistance R13, described
One end of resistance R11 is connect with the output end of the direct current regulation circuit 10, the other end while the output end (7 with amplifier U3B
Foot), the connection of one end of resistance R12, the other end of resistance R12 connect with the base stage of triode Q1, one end of the resistance R13 and
The output end of the direct current regulation circuit 10 connects, and the other end is connect with the anode of the luminous tube of the optocoupler U2, optocoupler U2's
The cathode of luminous tube is connect with the collector of triode Q1, the emitter ground connection of triode Q1, the photosensitive pipe collector of optocoupler U2
It is connect by a resistance R14 with VCC power supply, the emitter ground connection of the photosensitive tube of optocoupler U2.
The relay protection circuit 50 includes relay RL1, NPN triode Q2, PNP triode Q3, NPN triode
Q4, diode D4, resistance R15, resistance R16, resistance R17, resistance R18 and MCU.The detection foot (V-CHECK) of the MCU passes through
Resistance R15 is connect with the collector of the photosensitive tube of optocoupler U2, and the control foot (MCU-R) of MCU passes through resistance R18's and triode Q4
Base stage connection.The base stage of triode Q2 is connect with the collector of the photosensitive tube of optocoupler U2, emitter ground connection, collector respectively with electricity
Hinder one end connection of R16, resistance R17, the other end of resistance R17 and the base stage of triode Q3, the other end of resistance R16, three poles
The collector of pipe Q3 is connect with 12V power supply, the emitter of triode Q3 while the line with the cathode of diode D4, relay RL1
One end of circle connects, and the anode of diode D4, the other end of the coil of relay RL1 connect with the collector of triode Q4 simultaneously
It connects, the emitter ground connection of triode Q4, the fixed contact of relay and the power supply positive input of load connect, the work of relay
Movable contact is connect with exchange firewire.
The course of work of the overvoltage crowbar provided by the invention for being adapted to twin voltage is as follows:
Resistance R1, the capacitor CX1 of the direct current regulation circuit 10 form capacitance-resistance voltage reduction circuit, diode D1, diode D2
Form full-wave rectifying circuit, voltage-stabiliser tube Z1 and voltage-stabiliser tube U1 form voltage regulator circuit, external ac power source (alternating current) by resistance R1,
The decompression of capacitor CX1 is rectified using diode D1, diode D2, after finally will being after voltage-stabiliser tube Z1 and voltage-stabiliser tube U1 pressure stabilizing
End provides reliable and stable 5V DC voltage source.The 5V DC voltage that direct current regulation circuit 10 exports, by resistance R6 (140K)
Stable reference voltage source is provided to amplifier U3A with resistance R7 (120K) partial pressure, is the inverting input terminal (the 2nd foot) of amplifier U3A
Stable reference voltage (reference voltage) V2=5V × R7/ (the R6+R7)=2.3V of offer.
The diode D3 of the pressure sampling circuit 30 constitutes half-wave rectifying circuit, when accessing 220V AC power source, dials
Dynamic toggle switch SW1 disconnects toggle switch SW1, and 220V voltage is divided by resistance R2, resistance R3, resistance R4 and mentioned to amplifier U3A
It is offer sampled voltage V3=Vin × R4/ (R2+R3+R4) of the normal phase input end (the 3rd foot) of amplifier U3A for sampled voltage；
It is more than that voltage rating 20% is considered as over-voltage according to design principle, i.e. the high pressure limit of 220V AC power source is 265VAC, through more than half
Wave rectification, voltage V3=265 × 0.5 × R4/ (R2+R3+R4)=2.3V of the 3rd foot of amplifier U3A, therefore, 220V AC power source
When over-voltage, alternating voltage is more than 265VAC, i.e. V3 is greater than 2.3V.
When accessing 110V AC power source, stirring toggle switch SW1 is combined toggle switch SW1, and 110V voltage is by resistance
R2, resistance R3, resistance R4, which are divided, provides sampled voltage to amplifier U3A, is the offer of the normal phase input end (the 3rd foot) of amplifier U3A
Sampled voltage V3=Vin × R4/ (R2+R4)；It is more than that voltage rating 20% is considered as over-voltage, i.e. 110V alternating current according to design principle
The high pressure limit in source is 133VAC, by halfwave rectifier, voltage V3=133 × 0.5 × R4/ (R2+R4) of the 3rd foot of amplifier U3A
=2.3V, therefore, when 110V AC power source over-voltage, alternating voltage is more than 133VAC, i.e. V3 is greater than 2.3V.
When amplifier U3A normal phase input end (the 3rd foot) voltage V3=Vin × R4/ (R2+R3+R4) or V3=Vin ×
Once being greater than V2 (V2=2.3V) this reference voltage, the output end (the 1st foot) of amplifier U3A just occurs dynamic R4/ (R2+R4)
Make --- become hanging from ground state.At this point, circuit is filled by resistance R8 (10K) to electrolytic capacitor EC2 (CD110-100UF)
Electricity, after continuing for some time, filled on electrolytic capacitor EC2 reference voltage of the voltage greater than amplifier U3B (by resistance R9 and R10 point
Press to obtain 2.5V) when, the output end (the 7th foot) of amplifier U3B just becomes hanging from ground state.At this point, triode Q1 is connected, optocoupler
U2 becomes being connected from cut-off, and V-CHECK becomes low level 0V from high level VCC, and V-CHECK is connect in the detection port of MCU use
Make level detection, after MCU detects low level, output control signal disconnects triode Q4, thus block system relay LR1 line
The driving voltage for enclosing end, starts soft protection；Simultaneously because optocoupler U2 conducting disconnects triode Q2, and then triode Q3 is disconnected,
The driving voltage of relay LR1 coil-end is cut off, relay LR1 is forced directly to disconnect, and system enters hard guard mode.
The overvoltage crowbar for being adapted to twin voltage of the invention has the advantage that
The soft protection of over-voltage can be achieved at the same time in one, and over-voltage is protected firmly；
Two, can change the resistance value size of pressure sampling circuit internal resistance network by toggle switch to change described point
The sampled voltage of sample circuit output is pressed, overvoltage protection purpose is carried out to reach circuit and can be adapted to twin voltage, in access two
When the AC power source of a different voltages, the overvoltage protection of circuit may be implemented, it can the exchange of two different voltages of adaptation
Power supply.
Three, are also connected with an isolation circuit between the comparison circuit and the relay protection circuit, by sampling electricity
Road and protection circuit are completely isolated, so that system has deeper time safety and derivative characteristic.
Four, are connected with a delay Anti-shaking circuit after the comparison circuit, and the resistance R8 being delayed in Anti-shaking circuit is being transported
It puts the output end of U3A and charges when becoming hanging from ground state to capacitor EC2, after continuing for some time, fill electric on capacitor EC2
When pressure is greater than the reference voltage of amplifier U3B, the output end of amplifier U3B just becomes hanging from ground state.Increase by resistance R8 and
The delay Anti-shaking circuit of capacitor EC2 composition can be avoided load and tremble since voltage instantaneous fluctuation causes false triggering to be protected
It is dynamic, only when true over-voltage and over-current occurs and maintains that for a period of time, cutting load could be triggered.
The above description is only a preferred embodiment of the present invention, rather than does limitation in any form to the present invention.This field
Technical staff can impose various equivalent changes and improvement, all institutes within the scope of the claims on the basis of the above embodiments
The equivalent variations or modification done, should all fall under the scope of the present invention.
Claims (10)
1. the overvoltage crowbar that one kind can be adapted to twin voltage, which is characterized in that the overvoltage crowbar includes:
One direct current regulation circuit is used to be depressured alternating current, rectify, steady pressure treatment, and stablizes in output end output one
Direct current；
One reference voltage circuit is used to take electricity from the output end of the direct current regulation circuit, and to the defeated of direct current regulation circuit
Outlet voltage for comparison circuit provides a reference voltage after being divided；
One pressure sampling circuit is used to take electricity from external ac power source, and after collected alternating current is rectified, divided
A sampled voltage is provided for comparison circuit, which is connected with a toggle switch, which is used for by changing
Become the resistance value of the pressure sampling circuit internal resistance network to change the sampled voltage of the pressure sampling circuit output；
One comparison circuit is used for the sampled voltage compared with reference voltage carries out voltage, and according to comparison result output phase
The control signal answered；
One relay protection circuit comprising have relay, switching tube Q2, switching tube Q3, switching tube Q4 and MCU, the MCU root
Control the on-off of the switching tube Q4 according to the control signal that the comparison circuit exports, so the on-off of the control relay with
Control the on-off of load circuit；The switching tube Q2 controls the switching tube Q3 according to the control signal that the comparison circuit exports
On-off, and then control the on-off of the relay to control the on-off of load circuit.
2. the overvoltage crowbar of twin voltage can be adapted to as described in claim 1, which is characterized in that the comparison circuit and institute
It states and is also connected with an isolation circuit between relay protection circuit.
3. the overvoltage crowbar of twin voltage can be adapted to as claimed in claim 2, which is characterized in that the isolation circuit includes
There are one end of optocoupler U2, NPN triode Q1, resistance R11, resistance R12 and resistance R13, the resistance R11 and the DC voltage-stabilizing
The output end of circuit connects, and the other end is connect with one end of the output end of comparison circuit, resistance R12 simultaneously, and resistance R12's is another
End is connect with the base stage of triode Q1, and one end of the resistance R13 is connect with the output end of the direct current regulation circuit, the other end
It being connect with the anode of the luminous tube of the optocoupler U2, the cathode of the luminous tube of optocoupler U2 is connect with the collector of triode Q1, and three
The emitter of pole pipe Q1 is grounded, and the photosensitive pipe collector of optocoupler U2 is connect by a resistance R14 with VCC power supply, the light of optocoupler U2
The emitter of quick pipe is grounded.
4. the overvoltage crowbar of twin voltage can be adapted to as claimed in claim 3, which is characterized in that the switching tube Q2, open
Pass pipe Q4 is NPN triode, and switching tube Q3 is PNP triode；The relay protection circuit further includes having diode D4, resistance
R15, resistance R16, resistance R17, resistance R18 and MCU；The detection foot of the MCU passes through the photosensitive tube of resistance R15 and optocoupler U2
The control foot of collector connection, MCU is connect by resistance R18 with the base stage of triode Q4；The base stage and optocoupler U2 of triode Q2
Photosensitive tube collector connection, emitter ground connection, collector connect with one end of resistance R16, resistance R17 respectively；Resistance R17
The other end and triode Q3 base stage, the other end of resistance R16, the collector of triode Q3 connect with 12V power supply, triode
The emitter of Q3 is connect with one end of the cathode of diode D4, the coil of relay simultaneously, the anode of diode D4, relay
The other end of coil is connect with the collector of triode Q4 simultaneously, the emitter ground connection of triode Q4, the fixed contact of relay
It is connect with the power supply positive input of load, the armature contact of relay is connect with exchange firewire.
5. the overvoltage crowbar of twin voltage can be adapted to as claimed in claim 2, which is characterized in that the comparison circuit with every
From a delay Anti-shaking circuit is also connected between circuit, which exports the control of the comparison circuit for being delayed
Signal.
6. the overvoltage crowbar of twin voltage can be adapted to as claimed in claim 5, which is characterized in that the delay Anti-shaking circuit
It include amplifier U3B, resistance R8, resistance R9, resistance R10 and capacitor EC2, one end of resistance R8 and the direct current regulation circuit
Output end connection, the other end connect with the output end of the anode of capacitor EC2, the normal phase input end of amplifier U3B and comparison circuit simultaneously
Connect, the cathode of capacitor EC2 ground connection, one end of resistance R9 is connect with the output end of the direct current regulation circuit, the other end at the same with
One end connection of the inverting input terminal, resistance R10 of amplifier U3B, the other end ground connection of resistance R10.
7. the overvoltage crowbar of twin voltage can be adapted to as described in claim 1, which is characterized in that the direct current regulation circuit
It include resistance R1, capacitor CX1, capacitor EC1, diode D1, diode D2, voltage-stabiliser tube Z1 and voltage-stabiliser tube U1, the voltage-stabiliser tube
The input terminal of U1 is connect with the cathode of the cathode of diode D1, the cathode of diode D2, voltage-stabiliser tube Z1 respectively, the sun of diode D1
Pole is connected by the firewire of capacitor CX1 and external ac power source, and resistance R1 is in parallel with the capacitor CX1, capacitor EC1 positive and
The output end of the voltage-stabiliser tube U1 connects, the anode of diode D2, the anode of voltage-stabiliser tube Z1, voltage-stabiliser tube U1 ground terminal and capacitor
The cathode of EC1 is grounded.
8. the overvoltage crowbar of twin voltage can be adapted to as described in claim 1, which is characterized in that the reference voltage circuit
It include resistance R6 and resistance R7, one end of resistance R6 is connect with the output end of the direct current regulation circuit, and the other end passes through electricity
R7 ground connection is hindered, the connecting node between the resistance R6 and resistance R7 is connect with the input terminal of the comparison circuit.
9. the overvoltage crowbar of twin voltage can be adapted to as described in claim 1, which is characterized in that the pressure sampling circuit
It include the firewire company of diode D3, resistance R2, resistance R3, the anode of resistance R4, the diode D3 and external ac power source
It connects, the cathode of triode D3 is grounded after being sequentially connected in series resistance R2, resistance R3, resistance R4, the toggle switch and the resistance R3
Parallel connection, the connecting node between the resistance R3 and resistance R4 are connect with the comparison circuit.
10. the overvoltage crowbar of twin voltage can be adapted to as described in claim 1, which is characterized in that the comparison circuit packet
Having included includes amplifier U3A, and the normal phase input end of amplifier U3A is connected to the output end of the pressure sampling circuit, and reverse phase is defeated
Enter the output end that end is connected to the reference voltage circuit.
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