CN207117156U - A kind of voltage protection circuit - Google Patents
A kind of voltage protection circuit Download PDFInfo
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- CN207117156U CN207117156U CN201720652427.9U CN201720652427U CN207117156U CN 207117156 U CN207117156 U CN 207117156U CN 201720652427 U CN201720652427 U CN 201720652427U CN 207117156 U CN207117156 U CN 207117156U
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Abstract
The utility model discloses a kind of voltage protection circuit, including the rectification circuit being connected with AC power, the voltage signal acquisition circuit that input is connected with rectification circuit；The voltage follower that input is connected with voltage signal acquisition circuit；Optocoupler, the anode of the light emitting diode in optocoupler and the output end of voltage follower connect, and the negative electrode of light emitting diode and the output negative pole line of rectification circuit connect；The colelctor electrode of photosensitive semiconductor pipe in optocoupler connects power supply, the grounded emitter of photosensitive semiconductor pipe by resistance；Input is connected with the colelctor electrode of photosensitive semiconductor pipe, the control module of the control terminal of output end and gate-controlled switch connection, rectification circuit output DC voltage not within a preset range when control gate-controlled switch shut-off；Gate-controlled switch is arranged on the output cathode line between AC power and load.The application realizes the electrical isolation between the input of voltage follower and the output end of photoelectrical coupler, and output signal is on input without influence, strong antijamming capability.
Description
Technical field
Voltage protection technical field is the utility model is related to, more particularly to a kind of voltage protection circuit.
Background technology
Voltage protection circuit is in power system in occupation of very important effect.Voltage protection circuit includes overvoltage protection
Circuit and under-voltage protecting circuit, its operation principle are：When power input exceedes predetermined threshold value to the voltage loaded, voltage is protected
Protection circuit acts, with protection power source and load.Occur many voltage protection circuits in the prior art, but these voltages are protected
Protection circuit is there is being easily disturbed, the shortcomings that poor anti jamming capability.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art need to solve at present
Problem.
Utility model content
The purpose of this utility model is to provide a kind of voltage protection circuit, realizes the one-way transmission of electric signal, realizes
Electrical isolation between the input of voltage follower and the output end of photoelectrical coupler, output signal on input without influence,
Strong antijamming capability.
In order to solve the above technical problems, the utility model provides a kind of voltage protection circuit, it is defeated applied to AC power
Enter system, the AC power input system includes AC power, and the AC power connects with load, and the circuit includes：
The rectification circuit being connected with the AC power；
The voltage signal acquisition circuit that input is connected with the rectification circuit；
The voltage follower that input is connected with the voltage signal acquisition circuit；
Optocoupler, the anode of the light emitting diode in the optocoupler are connected with the output end of the voltage follower, the hair
The negative electrode of optical diode is connected with the output negative pole line of the rectification circuit；The colelctor electrode of photosensitive semiconductor pipe in the optocoupler
Power supply, the grounded emitter of the photosensitive semiconductor pipe are connect by resistance；
Input is connected with the colelctor electrode of the photosensitive semiconductor pipe, the control of the control terminal of output end and gate-controlled switch connection
Molding block, for the DC voltage that is exported in the rectification circuit not within a preset range when control the gate-controlled switch to turn off；
The gate-controlled switch is arranged on the live wire between the AC power and load.
Preferably, the voltage signal acquisition circuit includes first voltage signal acquisition circuit, the first voltage signal
The input of Acquisition Circuit is connected with the rectification circuit；
The voltage follower includes first voltage follower, the input of the first voltage follower and described first
The output end connection of voltage signal acquisition circuit；
The optocoupler includes the first optocoupler, the anode of the first light emitting diode in first optocoupler and the described first electricity
Press the output end connection of signal acquisition circuit, the negative electrode of first light emitting diode and the output negative pole line of the rectification circuit
Connection；The colelctor electrode of the first photosensitive semiconductor pipe in first optocoupler connects power supply by resistance, and described first photosensitive partly leads
The grounded emitter of body pipe, first light emitting diode turn on when the DC voltage exceedes overvoltage threshold；
The control module includes the first control module, the input of first control module and described first photosensitive half
The control terminal contiguous block of the colelctor electrode connection of conductor tube, output end and gate-controlled switch, for being led in first light emitting diode
The gate-controlled switch is controlled to turn off when logical.
Preferably, the first voltage signal acquisition circuit includes first resistor and second resistance, the first resistor
Input of the first end as the voltage signal acquisition circuit, is connected with the output cathode line of the rectification circuit, and described
Second end of one resistance is connected with the first end of the second resistance, and its common port is as the first voltage signal acquisition circuit
Output end, the second end of the second resistance is connected with the output negative pole line of the rectification circuit.
Preferably, the voltage signal acquisition circuit also includes second voltage signal acquisition circuit, the second voltage letter
The input of number Acquisition Circuit is connected with the rectification circuit；
The voltage follower also includes second voltage follower, the input of the second voltage follower and described the
The output end connection of two voltage signal acquisition circuits；
The optocoupler also includes the second optocoupler, the anode and described second of the second light emitting diode in second optocoupler
The output end connection of voltage signal acquisition circuit, the negative electrode of second light emitting diode and the output negative pole of the rectification circuit
Line connects；The colelctor electrode of the second photosensitive semiconductor pipe in second optocoupler connects power supply by resistance, and described second photosensitive half
The grounded emitter of conductor tube, second light emitting diode end when the DC voltage is less than brownout threshold；
The control module also includes the second control module, the input of second control module and described second photosensitive
The control terminal contiguous block of the colelctor electrode connection of transistor, output end and gate-controlled switch, in second light emitting diode
The gate-controlled switch is controlled to turn off during cut-off.
Preferably, the second voltage signal acquisition circuit includes 3rd resistor and the 4th resistance, the 3rd resistor
Input of the first end as the voltage signal acquisition circuit, is connected with the output cathode line of the rectification circuit, and described
Second end of three resistance is connected with the first end of the 4th resistance, and its common port is as the second voltage signal acquisition circuit
Output end, the second end of the 4th resistance is connected with the output negative pole line of the rectification circuit.
Preferably, the gate-controlled switch is relay, the normally-closed contact of the relay be arranged on the AC power with
On live wire between load, the normally opened contact of the relay is hanging, can described in the first end conduct of the coil of the relay
The control terminal of switch is controlled, the second end of the coil of the relay is connected with power supply.
Preferably, first control module includes the first control chip, the first current-limiting resistance, the first NPN type triodes
And first diode, the input of the input of first control chip as first control module, first control
The output end of coremaking piece is connected by first current-limiting resistance with the base stage of the first NPN type triodes, and described first
The colelctor electrode of NPN type triode is connected with the negative electrode of first diode, and the anode of first diode is as described
The output end of one control module, the grounded emitter of first NPN type triode；First control chip is described
High level is exported during one LEDs ON.
Preferably, first control module includes the first PNP type triode, the first current-limiting resistance, the pole of the first NPN type three
Pipe and the first diode, the input of the base stage of first PNP type triode as first control module, described first
The colelctor electrode of PNP type triode is connected by first current-limiting resistance with the base stage of first NPN type triode, and described
The emitter stage of one PNP type triode connects power supply, the negative electrode of the colelctor electrode of first NPN type triode and first diode
Connection, the output end of the anode of first diode as first control module, the hair of first NPN type triode
Emitter grounding.
Preferably, second control module includes the second control chip, the second current-limiting resistance, the 2nd NPN type triodes
And second diode, the input of the input of second control chip as second control module, second control
The output end of coremaking piece is connected by second current-limiting resistance with the base stage of the 2nd NPN type triodes, and described second
The colelctor electrode of NPN type triode is connected with the negative electrode of second diode, and the anode of second diode is as described
The output end of two control modules, the grounded emitter of second NPN type triode；Second control chip is described
Two light emitting diodes export high level when ending.
Preferably, second control module includes the second current-limiting resistance, the second NPN type triode and the second diode,
Input of the first end of second current-limiting resistance as second control module, the second end of second current-limiting resistance
It is connected with the base stage of second NPN type triode, the colelctor electrodes of the 2nd NPN type triodes connects power supply, and described second
The colelctor electrode of NPN type triode is connected with the negative electrode of second diode, and the anode of second diode is as described
The output end of two control modules, the grounded emitter of second NPN type triode.
The utility model provides a kind of voltage protection circuit, applied to AC power input system, AC power input
System includes AC power, and AC power connects with load, and the circuit includes：The rectification circuit being connected with AC power, input
Hold the voltage signal acquisition circuit being connected with rectification circuit；The voltage follower that input is connected with voltage signal acquisition circuit；
Optocoupler, the anode of the light emitting diode in optocoupler and the output end of voltage follower connect, the negative electrode of light emitting diode and rectification
The output negative pole line connection of circuit；The colelctor electrode of photosensitive semiconductor pipe in optocoupler connects power supply, photosensitive semiconductor pipe by resistance
Grounded emitter；Input is connected with the colelctor electrode of photosensitive semiconductor pipe, the control terminal of output end and gate-controlled switch connection
Control module, for the DC voltage that is exported in rectification circuit not within a preset range when control gate-controlled switch shut-off；It is controllable to open
Close on the output cathode line being arranged between AC power and load.
It can be seen that the utility model is provided with voltage follower and photoelectrical coupler between rectification circuit and control module,
It is achieved thereby that the one-way transmission of electric signal, is realized between the input of voltage follower and the output end of photoelectrical coupler
Electrical isolation, output signal is on input without influence, strong antijamming capability.
Brief description of the drawings
, below will be to prior art and embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description are only of the present utility model
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of structural representation of voltage protection circuit provided by the utility model；
Fig. 2 is a kind of concrete structure schematic diagram of voltage protection circuit provided by the utility model；
Fig. 3 is the concrete structure schematic diagram of another voltage protection circuit provided by the utility model.
Embodiment
Core of the present utility model is to provide a kind of voltage protection circuit, realizes the one-way transmission of electric signal, realizes
Electrical isolation between the input of voltage follower and the output end of photoelectrical coupler, output signal on input without influence,
Strong antijamming capability.
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to
The scope of the utility model protection.
Fig. 1 is refer to, Fig. 1 is a kind of structural representation of voltage protection circuit provided by the utility model, and the circuit should
For AC power input system, AC power input system includes AC power, and AC power connects with load, the circuit bag
Include：
The rectification circuit 1 being connected with AC power；
The voltage signal acquisition circuit 2 that input is connected with rectification circuit 1；
The voltage follower that input is connected with voltage signal acquisition circuit 2；
Optocoupler, the anode of the light emitting diode in optocoupler and the output end of voltage follower connect, the moon of light emitting diode
Pole is connected with the output negative pole line of rectification circuit 1；The colelctor electrode of photosensitive semiconductor pipe in optocoupler connects power supply by resistance, photosensitive
The grounded emitter of transistor；
Input is connected with the colelctor electrode of photosensitive semiconductor pipe, the control of the control terminal of output end and gate-controlled switch 5 connection
Module 4, for the DC voltage that is exported in rectification circuit 1 not within a preset range when control gate-controlled switch 5 turn off；Gate-controlled switch
5 are arranged on the live wire between AC power and load.
Firstly the need of explanation, the application directly judge alternating current that AC power exports either with or without over-pressed or
Person is under-voltage, but alternating current first is converted into DC voltage by rectification circuit 1, indirectly by judge DC voltage whether
In preset range, and then judge the alternating current of AC power output either with or without over-pressed or under-voltage.
Specifically, voltage signal acquisition circuit 2 gathers the DC voltage that rectification circuit 1 exports, and DC voltage is changed
Voltage follower is sent to for low voltage signal, and voltage follower is sent to optocoupler, low electricity by the low voltage signal is loss-free
Pressure signal can control the photosensitive semiconductor pipe in optocoupler by controlling LEDs ON in optocoupler or cut-off
The level of colelctor electrode be low level or high level, finally control module 4 is controlled according to the low and high level of colelctor electrode
Gate-controlled switch 5 when shut-off.Wherein, the control of control module 4 is based on a condition：In DC voltage not in default model
Gate-controlled switch 5 is controlled to turn off when enclosing interior, this condition specifically includes controls gate-controlled switch when DC voltage is more than overvoltage threshold
5 turn off and control gate-controlled switch 5 to turn off when DC voltage is less than low pressure threshold, so as to protect AC power and load.
In the application, isolation module 3 is provided between rectification circuit 1 and control module, isolation module 3 here includes
Voltage follower and optocoupler, wherein, voltage follower is in high-impedance state to front stage circuits, special in low resistive state to late-class circuit
Point, it is achieved thereby that playing " isolation " effect to front stage circuit.And it is the specific small volume of optocoupler, long lifespan, contactless, it is anti-interference
Ability is strong, is insulated between output and input, the advantages of one-way transmission signal, further increases the anti-interference of voltage protection circuit
Property.
The utility model provides a kind of voltage protection circuit, applied to AC power input system, AC power input
System includes AC power, and AC power connects with load, and the circuit includes：The rectification circuit being connected with AC power, input
Hold the voltage signal acquisition circuit being connected with rectification circuit；The voltage follower that input is connected with voltage signal acquisition circuit；
Optocoupler, the anode of the light emitting diode in optocoupler and the output end of voltage follower connect, the negative electrode of light emitting diode and rectification
The output negative pole line connection of circuit；The colelctor electrode of photosensitive semiconductor pipe in optocoupler connects power supply, photosensitive semiconductor pipe by resistance
Grounded emitter；Input is connected with the colelctor electrode of photosensitive semiconductor pipe, the control terminal of output end and gate-controlled switch connection
Control module, for the DC voltage that is exported in rectification circuit not within a preset range when control gate-controlled switch shut-off；It is controllable to open
Close on the output cathode line being arranged between AC power and load.
It can be seen that the utility model is provided with voltage follower and photoelectrical coupler between rectification circuit and control module,
It is achieved thereby that the one-way transmission of electric signal, is realized between the input of voltage follower and the output end of photoelectrical coupler
Electrical isolation, output signal is on input without influence, strong antijamming capability.
Fig. 2 and Fig. 3 are refer to, wherein, Fig. 2 is that a kind of concrete structure of voltage protection circuit provided by the utility model shows
It is intended to, Fig. 3 is the concrete structure schematic diagram of another voltage protection circuit provided by the utility model, and the circuit is in above-mentioned implementation
On the basis of example：
As a kind of preferred embodiment, voltage signal acquisition circuit 2 includes first voltage signal acquisition circuit 21, the
The input of one voltage signal acquisition circuit 21 is connected with rectification circuit 1；
Voltage follower includes first voltage follower U1, first voltage follower U1 input and first voltage signal
The output end connection of Acquisition Circuit 21；
The anode that optocoupler includes the first light emitting diode in the first optocoupler B1, the first optocoupler B1 is adopted with first voltage signal
The output end connection of collector 21, the negative electrode of the first light emitting diode are connected with the output negative pole line of rectification circuit 1；First optocoupler
The colelctor electrode of the first photosensitive semiconductor pipe in B1 connects power supply by resistance, the grounded emitter of the first photosensitive semiconductor pipe, and
One light emitting diode turns on when DC voltage exceedes overvoltage threshold；
Control module 4 includes the first control module 41, the input of the first control module 41 and the first photosensitive semiconductor pipe
Colelctor electrode connection, the control terminal contiguous block of output end and gate-controlled switch 5 can for the control in the first LEDs ON
The shut-off of control switch 5.
Specifically, the voltage protection circuit that the application provides includes overvoltage crowbar, and overvoltage crowbar specifically includes
First voltage signal acquisition circuit 21, the first isolation module 31 (including first voltage follower U1 and the first optocoupler B1) and
One control module 41, when DC voltage is over-pressed namely DC voltage exceedes overvoltage threshold, overvoltage crowbar action, so as to protect
Power supply and load are protected.
As a kind of preferred embodiment, first voltage signal acquisition circuit 21 includes first resistor R1 and second resistance
Input of R2, first resistor the R1 first end as voltage signal acquisition circuit 2, connect with the output cathode line of rectification circuit 1
Connect, first resistor R1 the second end is connected with second resistance R2 first end, and its common port is as first voltage signal acquisition electricity
The output end on road 21, second resistance R2 the second end are connected with the output negative pole line of rectification circuit 1.
Specifically, in the application, first voltage signal acquisition circuit 21 can be by first resistor R1 and second resistance R2 structures
Into bleeder circuit form, the bleeder circuit is to DC voltage partial pressure, branch pressure voltageV+
For voltage on output cathode line, in specific set, can set when V+ is more than or equal to overvoltage threshold, the first diode
D1 is turned on, so as to realize when DC voltage exceedes overvoltage threshold, overvoltage crowbar action.
In addition, it is necessary to explanation, generally use voltage transformer carrys out collection voltages signal in the prior art, but voltage
The operating temperature of transformer is narrower, is usually -25 ° -70 °, is not suitable for the situation high to environment temperature calling hierarchy, and electricity
Press the volume of transformer larger, be not suitable for using in size-constrained occasion.
And voltage acquisition is carried out using the bleeder circuit of two divider resistances compositions in the application, on the one hand, resistance
Operating temperature is higher, and general model can meet -55 ° -110 ° of operating temperature, on the other hand, the device that the bleeder circuit uses
Part is few, and circuit structure is simple, small volume and cost is low.
As a kind of preferred embodiment, voltage signal acquisition circuit 2 also includes second voltage signal acquisition circuit 22, the
The input of two voltage signal acquisition circuits 22 is connected with rectification circuit 1；
Voltage follower also includes second voltage follower U2, and second voltage follower U2 input and second voltage are believed
The output end connection of number Acquisition Circuit 22；
Optocoupler also includes the anode and second voltage signal of the second light emitting diode in the second optocoupler B2, the second optocoupler B2
The output end connection of Acquisition Circuit 22, the negative electrode of the second light emitting diode are connected with the output negative pole line of rectification circuit 1；Second light
The colelctor electrode of the second photosensitive semiconductor pipe in coupling B2 connects power supply by resistance, the grounded emitter of the second photosensitive semiconductor pipe,
Second light emitting diode ends when DC voltage is less than brownout threshold；
Control module 4 also includes the second control module 42, the input and the second photosensitive semiconductor of the second control module 42
The colelctor electrode connection of pipe, output end and the control terminal contiguous block of gate-controlled switch 5, for being controlled when the second light emitting diode ends
Gate-controlled switch 5 turns off.
Specifically, the voltage protection circuit that the application provides also includes under-voltage protecting circuit, and under-voltage protecting circuit specifically wraps
Include second voltage signal acquisition circuit 22, the second isolation module 32 (including second voltage follower U2 and the second optocoupler B2) and
Second control module 42, when DC voltage is under-voltage namely DC voltage is less than brownout threshold, under-voltage protecting circuit action, so as to
Protect power supply and load.
As a kind of preferred embodiment, second voltage signal acquisition circuit 22 includes 3rd resistor R3 and the 4th resistance
Input of R4,3rd resistor the R3 first end as voltage signal acquisition circuit 2, connect with the output cathode line of rectification circuit 1
Connect, 3rd resistor R3 the second end is connected with the 4th resistance R4 first end, and its common port is as second voltage signal acquisition electricity
The output end on road 22, the 4th resistance R4 the second end are connected with the output negative pole line of rectification circuit 1.
Specifically, in the application, second voltage signal acquisition circuit 22 is made up of 3rd resistor R3 and the 4th resistance R4
Bleeder circuit is formed, and the bleeder circuit is to DC voltage partial pressure, branch pressure voltageSpecific
It during setting, can set when V+ is less than or equal to overvoltage threshold, the second diode D2D2 cut-offs, work as direct current so as to realize
Force down when brownout threshold, under-voltage protecting circuit action.
As a kind of preferred embodiment, gate-controlled switch 5 is relay K, and relay K normally-closed contact is arranged on alternating current
On live wire between source and load, relay K normally opened contact is hanging, and the first end of relay K coil is as gate-controlled switch
5 control terminal, the second end of relay K coil are connected with power supply.
Specifically, gate-controlled switch 5 here be except that can use relay K, can also use other kinds of controllable open
Close, the utility model is not particularly limited, determined according to actual conditions herein.
As a kind of preferred embodiment, the first control module 41 includes the first control chip, the first current-limiting resistance R5, the
One NPN type triode Q1 and the first diode D1, the input of the input of the first control chip as the first control module 41,
The output end of first control chip is connected by the first current-limiting resistance R5 with the first NPN type triode Q1 base stage, the first NPN
Type triode Q1 colelctor electrode is connected with the first diode D1 negative electrode, and the first diode D1 anode is as the first control module
41 output end, the first NPN type triode Q1 grounded emitter；First control chip is defeated in the first LEDs ON
Go out high level.
Specifically, in overvoltage, the first light emitting diode is switched to conducting state, the first photosensitive semiconductor by cut-off state
The colelctor electrode of pipe turns on emitter stage, and colelctor electrode is launched pole and drags down that (pull-up resistor is when input voltage is non-over-pressed by the first light
Coupling B1 colelctor electrode is pulled to high level), will when the first control chip detects that input pin INA is changed into low level from high level
Output pin OUTA is arranged to high level, and the first NPN type triode Q1, the first NPN type three are driven by the first current-limiting resistance R5
Pole pipe Q1 is turned on, the first diode D1 conductings, relay K work, and relay K switch becomes normally open by normally off, electricity
Source circuit disconnects, and plays a part of protecting follow-up work circuit.
As a kind of preferred embodiment, the first control module 41 includes the first PNP type triode Q3, the first current-limiting resistance
R5, the first NPN type triode Q1 and the first diode D1, the first PNP type triode Q3 base stage are as the first control module 41
Input, the base stage that the first PNP type triode Q3 colelctor electrode passes through the first current-limiting resistance R5 and the first NPN type triode Q1
Connection, the first PNP type triodes Q3 emitter stage connect power supply, the first NPN type triode Q1 colelctor electrode and the first diode
D1 negative electrode connection, the output end of the first diode D1 anode as the first control module 41, the first NPN type triode Q1
Grounded emitter.
Specifically, input of the embodiment using the first PNP type triode Q3 base stage as the first control chip, first
Output end of the PNP type triode Q3 colelctor electrode as the first control chip, when the voltage of the first PNP type triode Q3 base stage
When being changed into low level from high level, the first PNP type triode Q3 is changed into turning on from turning off, the first PNP type triode Q3 current collection
The voltage of pole is changed into high voltage, the first NPN type triode Q1 conductings, the first diode D1 conductings, relay K work, relay K
Switch becomes normally open by normally off, and power circuit disconnects, and plays a part of protecting follow-up work circuit.
As a kind of preferred embodiment, the second control module 42 includes the second control chip, the second current-limiting resistance R6, the
Two NPN type triode Q2 and the second diode D2, the input of the input of the second control chip as the second control module 42,
The output end of second control chip is connected by the second current-limiting resistance R6 with the second NPN type triode Q2 base stage, the 2nd NPN
Type triode Q2 colelctor electrode is connected with the second diode D2 negative electrode, and the second diode D2 anode is as the second control module
42 output end, the second NPN type triode Q2 grounded emitter；Second control chip is defeated when the second light emitting diode ends
Go out high level.
Specifically, when under-voltage, the second light emitting diode in the second optocoupler B2 is switched to by state by conducting state,
The colelctor electrode of first photosensitive semiconductor pipe is switched to off-state with emitter stage by conducting state, and colelctor electrode exports because of pull-up resistor
High level, after the second control chip detects changes of the input pin INB by low level to high level, output pin OUTB is set
High level is set to, is turned on by the second current-limiting resistance R6 the second NPN type triodes of driving Q2, the second NPN type triode Q2, the
Two diode D2 are turned on, relay K work, and relay K switch becomes normally open by normally off, and power circuit disconnects,
Play a part of protecting follow-up work circuit.
As a kind of preferred embodiment, the second control module 42 includes the second current-limiting resistance R6, the pole of the second NPN type three
Input of pipe Q2 and the second diode D2, the second current-limiting resistance R6 first end as the second control module 42, the second current limliting
Resistance R6 the second end is connected with the second NPN type triode Q2 base stage, and the second NPN type triode Q2 colelctor electrode connects power supply,
Second NPN type triode Q2 colelctor electrode is connected with the second diode D2 negative electrode, and the second diode D2 anode is as second
The output end of control module 42, the second NPN type triode Q2 grounded emitter.
Specifically, input of the embodiment using the second current-limiting resistance R6 first end as the second control chip, when
When the voltage of two NPN type triode Q2 base stage is changed into high level from low level, the 2nd NPN type triodes Q2 is changed into from turning off
Conducting, the second NPN type triode Q2 emitter stage are changed into high voltage, the second NPN type triode Q2 conductings, and the second diode D2 is led
Logical, relay K work, relay K switches become normally open by normally off, and power circuit disconnects, and play the follow-up work of protection
Make the effect of circuit.
In addition, it is necessary to explanation, the above-mentioned control module 42 of first control module 41 and second can also patrol for other
Structure is collected, the utility model is not particularly limited herein.
To sum up, the voltage protection circuit that the application provides is on the basis of strong antijamming capability, and cost is low, small volume, and
The ambient temperature range used is wider.
It should be noted that in this manual, such as first and second or the like relational terms are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of elements not only include those
Key element, but also the other element including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element in the process including the key element, method, article or equipment also be present.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (10)
1. a kind of voltage protection circuit, applied to AC power input system, the AC power input system includes alternating current
Source, the AC power connect with load, it is characterised in that the circuit includes：
The rectification circuit being connected with the AC power；
The voltage signal acquisition circuit that input is connected with the rectification circuit；
The voltage follower that input is connected with the voltage signal acquisition circuit；
Optocoupler, the anode of the light emitting diode in the optocoupler are connected with the output end of the voltage follower, and described luminous two
The negative electrode of pole pipe is connected with the output negative pole line of the rectification circuit；The colelctor electrode of photosensitive semiconductor pipe in the optocoupler passes through
Resistance connects power supply, the grounded emitter of the photosensitive semiconductor pipe；
Input is connected with the colelctor electrode of the photosensitive semiconductor pipe, the control mould of the control terminal of output end and gate-controlled switch connection
Block, for the DC voltage that is exported in the rectification circuit not within a preset range when control the gate-controlled switch to turn off；It is described
Gate-controlled switch is arranged on the live wire between the AC power and load.
2. voltage protection circuit as claimed in claim 1, it is characterised in that the voltage signal acquisition circuit includes the first electricity
Signal acquisition circuit is pressed, the input of the first voltage signal acquisition circuit is connected with the rectification circuit；
The voltage follower includes first voltage follower, input and the first voltage of the first voltage follower
The output end connection of signal acquisition circuit；
The optocoupler includes the first optocoupler, and anode and the first voltage of the first light emitting diode in first optocoupler are believed
The output end connection of number Acquisition Circuit, the negative electrode of first light emitting diode connect with the output negative pole line of the rectification circuit
Connect；The colelctor electrode of the first photosensitive semiconductor pipe in first optocoupler connects power supply, first photosensitive semiconductor by resistance
The grounded emitter of pipe, first light emitting diode turn on when the DC voltage exceedes overvoltage threshold；
The control module includes the first control module, the input of first control module and first photosensitive semiconductor
The control terminal contiguous block of the colelctor electrode connection of pipe, output end and gate-controlled switch, in first LEDs ON
The gate-controlled switch is controlled to turn off.
3. voltage protection circuit as claimed in claim 2, it is characterised in that the first voltage signal acquisition circuit includes the
One resistance and second resistance, the input of the first end of the first resistor as the voltage signal acquisition circuit are and described
The output cathode line connection of rectification circuit, the second end of the first resistor are connected with the first end of the second resistance, and it is public
Output end of the end as the first voltage signal acquisition circuit altogether, the second end and the rectification circuit of the second resistance
Output negative pole line connects.
4. voltage protection circuit as claimed in claim 2, it is characterised in that the voltage signal acquisition circuit also includes second
Voltage signal acquisition circuit, the input of the second voltage signal acquisition circuit are connected with the rectification circuit；
The voltage follower also includes second voltage follower, the input of the second voltage follower and the described second electricity
Press the output end connection of signal acquisition circuit；
The optocoupler also includes the second optocoupler, anode and the second voltage of the second light emitting diode in second optocoupler
The output end connection of signal acquisition circuit, the negative electrode of second light emitting diode connect with the output negative pole line of the rectification circuit
Connect；The colelctor electrode of the second photosensitive semiconductor pipe in second optocoupler connects power supply, second photosensitive semiconductor by resistance
The grounded emitter of pipe, second light emitting diode end when the DC voltage is less than brownout threshold；
The control module also includes the second control module, and the input of second control module photosensitive is partly led with described second
The control terminal contiguous block of the colelctor electrode connection of body pipe, output end and gate-controlled switch, for ending in second light emitting diode
When control the gate-controlled switch to turn off.
5. voltage protection circuit as claimed in claim 4, it is characterised in that the second voltage signal acquisition circuit includes the
Three resistance and the 4th resistance, the input of the first end of the 3rd resistor as the voltage signal acquisition circuit are and described
The output cathode line connection of rectification circuit, the second end of the 3rd resistor are connected with the first end of the 4th resistance, and it is public
Output end of the end as the second voltage signal acquisition circuit altogether, the second end and the rectification circuit of the 4th resistance
Output negative pole line connects.
6. voltage protection circuit as claimed in claim 4, it is characterised in that the gate-controlled switch is relay, the relay
The normally-closed contact of device is arranged on the live wire between the AC power and load, and the normally opened contact of the relay is hanging, institute
State control terminal of the first end of the coil of relay as the gate-controlled switch, the second end of the coil of the relay and power supply
Connection.
7. voltage protection circuit as claimed in claim 6, it is characterised in that first control module includes the first control core
Piece, the first current-limiting resistance, the first NPN type triode and the first diode, described in the input of first control chip is used as
The input of first control module, the output end of first control chip pass through first current-limiting resistance and described first
The base stage connection of NPN type triode, the colelctor electrode of first NPN type triode are connected with the negative electrode of first diode,
Output end of the anode of first diode as first control module, the emitter stage of first NPN type triode
Ground connection；First control chip exports high level in first LEDs ON.
8. voltage protection circuit as claimed in claim 6, it is characterised in that first control module includes the first positive-negative-positive
Triode, the first current-limiting resistance, the first NPN type triode and the first diode, the base stage conduct of first PNP type triode
The input of first control module, the colelctor electrode of first PNP type triode pass through first current-limiting resistance and institute
The base stage connection of the first NPN type triode is stated, the emitter stage of first PNP type triode connects power supply, first NPN type three
The colelctor electrode of pole pipe is connected with the negative electrode of first diode, and the anode of first diode is as the described first control mould
The output end of block, the grounded emitter of first NPN type triode.
9. voltage protection circuit as claimed in claim 6, it is characterised in that second control module includes the second control core
Piece, the second current-limiting resistance, the second NPN type triode and the second diode, described in the input of second control chip is used as
The input of second control module, the output end of second control chip pass through second current-limiting resistance and described second
The base stage connection of NPN type triode, the colelctor electrode of second NPN type triode are connected with the negative electrode of second diode,
Output end of the anode of second diode as second control module, the emitter stage of second NPN type triode
Ground connection；Second control chip exports high level when second light emitting diode ends.
10. voltage protection circuit as claimed in claim 6, it is characterised in that second control module includes the second current limliting
Resistance, the second NPN type triode and the second diode, the first end of second current-limiting resistance is as second control module
Input, the second end of second current-limiting resistance is connected with the base stage of second NPN type triode, the 2nd NPN
The colelctor electrode of type triode connects power supply, and the colelctor electrode of second NPN type triode is connected with the negative electrode of second diode,
Output end of the anode of second diode as second control module, the emitter stage of second NPN type triode
Ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720652427.9U CN207117156U (en) | 2017-06-06 | 2017-06-06 | A kind of voltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720652427.9U CN207117156U (en) | 2017-06-06 | 2017-06-06 | A kind of voltage protection circuit |
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| CN207117156U true CN207117156U (en) | 2018-03-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069655A (en) * | 2017-06-06 | 2017-08-18 | 吉林省中赢高科技有限公司 | A kind of voltage protection circuit |
| CN108900104A (en) * | 2018-09-10 | 2018-11-27 | 深圳市德利和能源技术有限公司 | IGBT analog device, level analog circuit and three level emulation platforms |
| CN109387296A (en) * | 2018-10-29 | 2019-02-26 | 许继集团有限公司 | A kind of temperature sensing circuit |
| CN110077275A (en) * | 2019-04-23 | 2019-08-02 | 上海电气集团股份有限公司 | A kind of slave control circuit of energy storage battery management system |
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2017
- 2017-06-06 CN CN201720652427.9U patent/CN207117156U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069655A (en) * | 2017-06-06 | 2017-08-18 | 吉林省中赢高科技有限公司 | A kind of voltage protection circuit |
| CN107069655B (en) * | 2017-06-06 | 2020-11-27 | 吉林省中赢高科技有限公司 | Voltage protection circuit |
| CN108900104A (en) * | 2018-09-10 | 2018-11-27 | 深圳市德利和能源技术有限公司 | IGBT analog device, level analog circuit and three level emulation platforms |
| CN108900104B (en) * | 2018-09-10 | 2024-04-16 | 深圳市德利和能源技术有限公司 | IGBT analog device, level analog circuit and three-level simulation platform |
| CN109387296A (en) * | 2018-10-29 | 2019-02-26 | 许继集团有限公司 | A kind of temperature sensing circuit |
| CN110077275A (en) * | 2019-04-23 | 2019-08-02 | 上海电气集团股份有限公司 | A kind of slave control circuit of energy storage battery management system |
| CN110077275B (en) * | 2019-04-23 | 2022-11-01 | 上海电气集团股份有限公司 | Slave control circuit of energy storage battery management system |
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