CN107069655A - A kind of voltage protection circuit - Google Patents
A kind of voltage protection circuit Download PDFInfo
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- CN107069655A CN107069655A CN201710418303.9A CN201710418303A CN107069655A CN 107069655 A CN107069655 A CN 107069655A CN 201710418303 A CN201710418303 A CN 201710418303A CN 107069655 A CN107069655 A CN 107069655A
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- voltage
- input
- circuit
- type triode
- signal acquisition
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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
- H02H3/207—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 also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- Electromagnetism (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention 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；The anode of light emitting diode in optocoupler, optocoupler and the output end of voltage follower are connected, and the negative electrode of light emitting diode and the output negative pole line of rectification circuit are connected；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 end of output end and gate-controlled switch connection, the DC voltage that rectification circuit is exported 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
The present invention relates to voltage protection technical field, 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 is：When power input exceedes predetermined threshold value to the voltage loaded, voltage is protected
Protection circuit is acted, to protect power supply and load.Many voltage protection circuits have been occurred in that in the prior art, but these voltages are protected
Protection circuit, which is existed, to be easily disturbed, the shortcoming of 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 solution at present
Problem.
The content of the invention
It is an object of the invention to provide a kind of voltage protection circuit, the one-way transmission of electric signal is realized, voltage is realized
Electrical isolation between the input of follower and the output end of photoelectrical coupler, output signal, without influence, resists dry on input
Disturb ability strong.
In order to solve the above technical problems, the invention provides a kind of voltage protection circuit, system is inputted applied to AC power
System, the AC power input system includes AC power, and the AC power is connected 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；
The anode of light emitting diode in optocoupler, the optocoupler is 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 end 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 anode and the described first electricity of the first light emitting diode in the first optocoupler, first optocoupler
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 is turned 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 end 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
First end is connected as the input of the voltage signal acquisition circuit 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 used 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 anode and described second of the second light emitting diode in the second optocoupler, 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 is connected；The colelctor electrode of the second photosensitive semiconductor pipe in second optocoupler connects power supply, described second photosensitive half by resistance
The grounded emitter of conductor tube, second light emitting diode ends 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 end 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
First end is connected as the input of the voltage signal acquisition circuit 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 used 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, the first end of the coil of the relay as it is described can
The control end 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 triode
And first diode, the input of first control chip is used as the input of first control module, first control
The output end of coremaking piece is connected by first current-limiting resistance with the base stage of first NPN type triode, the first NPN
The colelctor electrode of type triode is connected with the negative electrode of first diode, and the anode of first diode is used as the described first control
The output end of molding block, the grounded emitter of first NPN type triode；First control chip is luminous described first
High level is exported during diode current flow.
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 base stage of first PNP type triode as first control module input, 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 anode of first diode is used as the output end of 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 second NPN type triode
And second diode, the input of second control chip is used as the input of second control module, second control
The output end of coremaking piece is connected by second current-limiting resistance with the base stage of second NPN type triode, the 2nd NPN
The colelctor electrode of type triode is connected with the negative electrode of second diode, and the anode of second diode is used as the described second control
The output end of molding block, the grounded emitter of second NPN type triode；Second control chip is luminous described second
Diode exports high level when ending.
Preferably, second control module includes the second current-limiting resistance, the second NPN type triode and the second diode,
The first end of second current-limiting resistance is used as the input of second control module, the second end of second current-limiting resistance
It is connected with the base stage of first NPN type triode, the colelctor electrode of second NPN type triode connects power supply, the 2nd NPN
The colelctor electrode of type triode is connected with the negative electrode of second diode, and the anode of second diode is used as the described second control
The output end of molding block, the grounded emitter of second NPN type triode.
The invention provides a kind of voltage protection circuit, applied to AC power input system, AC power input system
Including AC power, AC power is connected with load, and the circuit includes：The rectification circuit being connected with AC power, input with
The voltage signal acquisition circuit of rectification circuit connection；The voltage follower that input is connected with voltage signal acquisition circuit；Optocoupler,
The output end of the anode of light emitting diode in optocoupler and voltage follower is connected, the negative electrode of light emitting diode and rectification circuit
Output negative pole line is connected；The colelctor electrode of photosensitive semiconductor pipe in optocoupler connects power supply, the transmitting of photosensitive semiconductor pipe by resistance
Pole is grounded；Input is connected with the colelctor electrode of photosensitive semiconductor pipe, the control mould of the control end of output end and gate-controlled switch connection
Block, for the DC voltage that is exported in rectification circuit not within a preset range when control gate-controlled switch shut-off；Gate-controlled switch is set
On output cathode line between AC power and load.
It can be seen that, the present invention is provided with voltage follower and photoelectrical coupler between rectification circuit and control module, so that
The one-way transmission of electric signal is realized, is realized electric between the input of voltage follower and the output end of photoelectrical coupler
Isolation, output signal is on input without influence, strong antijamming capability.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
A kind of structural representation for voltage protection circuit that Fig. 1 provides for the present invention；
A kind of concrete structure schematic diagram for voltage protection circuit that Fig. 2 provides for the present invention；
The concrete structure schematic diagram for another voltage protection circuit that Fig. 3 provides for the present invention.
Embodiment
The core of the present invention is to provide a kind of voltage protection circuit, realizes the one-way transmission of electric signal, realizes voltage
Electrical isolation between the input of follower and the output end of photoelectrical coupler, output signal, without influence, resists dry on input
Disturb ability strong.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is refer to, a kind of structural representation for voltage protection circuit that Fig. 1 provides for the present invention, the circuit is applied to
AC power input system, AC power input system includes AC power, and AC power is connected with load, and the circuit includes：
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；
The anode of light emitting diode in optocoupler, optocoupler and the output end of voltage follower are connected, 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 end 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 do not have directly judge the alternating current of AC power output 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, the DC voltage that the collection of voltage signal acquisition circuit 2 rectification circuit 1 is exported, 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 be by controlling the photosensitive semiconductor pipe in the LEDs ON or cut-off and then control optocoupler in optocoupler
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 is specifically included controls gate-controlled switch 5 when DC voltage is more than overvoltage threshold
Turn off and control gate-controlled switch 5 is turned 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, and the advantage of one-way transmission signal further increases the anti-interference of voltage protection circuit
Property.
The invention provides a kind of voltage protection circuit, applied to AC power input system, AC power input system
Including AC power, AC power is connected with load, and the circuit includes：The rectification circuit being connected with AC power, input with
The voltage signal acquisition circuit of rectification circuit connection；The voltage follower that input is connected with voltage signal acquisition circuit；Optocoupler,
The output end of the anode of light emitting diode in optocoupler and voltage follower is connected, the negative electrode of light emitting diode and rectification circuit
Output negative pole line is connected；The colelctor electrode of photosensitive semiconductor pipe in optocoupler connects power supply, the transmitting of photosensitive semiconductor pipe by resistance
Pole is grounded；Input is connected with the colelctor electrode of photosensitive semiconductor pipe, the control mould of the control end of output end and gate-controlled switch connection
Block, for the DC voltage that is exported in rectification circuit not within a preset range when control gate-controlled switch shut-off；Gate-controlled switch is set
On output cathode line between AC power and load.
It can be seen that, the present invention is provided with voltage follower and photoelectrical coupler between rectification circuit and control module, so that
The one-way transmission of electric signal is realized, is realized electric between the input of voltage follower and the output end of photoelectrical coupler
Isolation, output signal is on input without influence, strong antijamming capability.
Fig. 2 and Fig. 3 are refer to, wherein, a kind of concrete structure signal for voltage protection circuit that Fig. 2 provides for the present invention
Figure, the concrete structure schematic diagram for another voltage protection circuit that Fig. 3 provides for the present invention, base of the circuit in above-described embodiment
On plinth：
As a kind of preferred embodiment, voltage signal acquisition circuit 2 includes first voltage signal acquisition circuit 21, first
The input of 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 is 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, the grounded emitter of the first photosensitive semiconductor pipe, by resistance
One light emitting diode is turned 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 end contiguous block of output end and gate-controlled switch 5 can for the control in the first LEDs ON
Control switch 5 is turned off.
Specifically, the voltage protection circuit that the application is provided includes overvoltage crowbar, and overvoltage crowbar is specifically included
First voltage signal acquisition circuit 21, the first isolation module 31 (including first voltage follower U1 and the first optocoupler B1) and first
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.
As a kind of preferred embodiment, first voltage signal acquisition circuit 21 includes first resistor R1 and second resistance
R2, first resistor R1 first end connect as the input of voltage signal acquisition circuit 2 with the output cathode line of rectification circuit 1
Connect, first resistor R1 the second end is connected with second resistance R2 first end, its common port is used as first voltage signal acquisition electricity
The output end on road 21, second resistance R2 the second end is 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 constitute, the bleeder circuit is to DC voltage partial pressure, branch pressure voltageV+
For voltage on output cathode line, in specific set, it 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, in the prior art generally using voltage transformer come collection voltages signal, 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 is used
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 is 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 end contiguous block of gate-controlled switch 5, for being controlled when the second light emitting diode ends
Gate-controlled switch 5 is turned off.
Specifically, the voltage protection circuit that the application is provided also includes under-voltage protecting circuit, and under-voltage protecting circuit is specifically wrapped
Include second voltage signal acquisition circuit 22, the second isolation module 32 (including second voltage follower U2 and the second optocoupler B2) and
Two control modules 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 are protected.
As a kind of preferred embodiment, second voltage signal acquisition circuit 22 includes 3rd resistor R3 and the 4th resistance
R4,3rd resistor R3 first end connect as the input of voltage signal acquisition circuit 2 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, its common port is used as second voltage signal acquisition electricity
The output end on road 22, the 4th resistance R4 the second end is 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 constituted, and the bleeder circuit is to DC voltage partial pressure, branch pressure voltageSpecific
During setting, it 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 used as gate-controlled switch 5
Control end, the second end of relay K coil is connected with power supply.
Specifically, gate-controlled switch 5 here controllable can also be opened except that can use relay K using other kinds of
Close, the present invention is not particularly limited herein, is determined according to actual conditions.
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 first control chip as the first control module 41 input,
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 used as the first control module 41
Output end, the first NPN type triode Q1 grounded emitter；First control chip is exported in the first LEDs ON
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 is turned 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), it is changed into low level when the first control chip detects input pin INA from high level, will
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, and the first diode D1 conductings, relay K work, 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 used 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 triode Q3 emitter stage meets power supply, the first NPN type triode Q1 colelctor electrode and the first diode D1
Negative electrode connection, the first diode D1 anode is used as the output end of the first control module 41, the first NPN type triode Q1 hair
Emitter grounding.
Specifically, the embodiment using the first PNP type triode Q3 base stage as the first control chip input, first
PNP type triode Q3 colelctor electrode as the first control chip output end, 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 conducting, the first PNP type triode Q3 current collection from turning off
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 second control chip as the second control module 42 input,
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 second NPN type
Triode Q2 colelctor electrode is connected with the second diode D2 negative electrode, and the second diode D2 anode is used as the second control module 42
Output end, the second NPN type triode Q2 grounded emitter；Second control chip is exported when the second light emitting diode ends
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 is exported because of pull-up resistor
High level, the second control chip detects input pin INB after the change of low level to high level, and output pin OUTB is set
High level is set to, passes through the second current-limiting resistance R6 driving the second NPN type triode Q2, the second NPN type triode Q2 conductings, second
Diode D2 is turned on, relay K work, and relay K switch becomes normally open by normally off, and power circuit disconnects, and rises
To the effect of protection follow-up work circuit.
As a kind of preferred embodiment, the second control module 42 includes the second current-limiting resistance R6, the second NPN type triode
Q2 and the second diode D2, the second current-limiting resistance R6 first end are used as the input of the second control module 42, the second current limliting electricity
Resistance R6 the second end is connected with the first NPN type triode Q1 base stage, and the second NPN type triode Q2 colelctor electrode connects power supply, the
Two NPN type triode Q2 colelctor electrode is connected with the second diode D2 negative electrode, and the second diode D2 anode is used as the second control
The output end of molding block 42, the second NPN type triode Q2 grounded emitter.
Specifically, the embodiment using the second current-limiting resistance R6 first end as the second control chip input, when
When the voltage of two NPN type triode Q2 base stage is changed into high level from low level, the second NPN type triode Q2 is changed into leading from turning off
Logical, the second NPN type triode Q2 emitter stage is changed into high voltage, and the second NPN type triode Q2 conductings, the second diode D2 is led
Logical, relay K work, relay K switch becomes normally open by normally off, and power circuit disconnects, and plays the follow-up work of protection
Make the effect of circuit.
In addition, it is necessary to which explanation, the above-mentioned control module 42 of first control module 41 and second can also patrol for other
Structure is collected, the present invention is not particularly limited herein.
To sum up, the voltage protection circuit that the application is provided 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 there is any this actual relation or order.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 key elements not only include those
Key element, but also other key elements 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
Also there is other identical element in the process including the key element, method, article or equipment.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
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 is connected 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；
The anode of light emitting diode in optocoupler, the optocoupler is 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 end 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 anode of the first light emitting diode in the first optocoupler, first optocoupler and the first voltage is believed
The output end connection of number Acquisition Circuit, the negative electrode of first light emitting diode connects 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 is turned 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 end 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 first end of the first resistor as the voltage signal acquisition circuit input, it is and described
The output cathode line connection of rectification circuit, the second end of the first resistor is connected with the first end of the second resistance, and it is public
End is used as the output end of the first voltage signal acquisition circuit, the second end and the rectification circuit of the second resistance altogether
Output negative pole line is connected.
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 is 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 anode and the second voltage of the second light emitting diode in the second optocoupler, second optocoupler
The output end connection of signal acquisition circuit, the negative electrode of second light emitting diode connects 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 ends 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 end contiguous block of the colelctor electrode connection of body pipe, output end and gate-controlled switch, in second light emitting diode cut-off
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 first end of the 3rd resistor as the voltage signal acquisition circuit input, it is and described
The output cathode line connection of rectification circuit, the second end of the 3rd resistor is connected with the first end of the 4th resistance, and it is public
End is used as the output end of the second voltage signal acquisition circuit, the second end and the rectification circuit of the 4th resistance altogether
Output negative pole line is connected.
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
The first end of coil of relay is stated as the control end of 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, the input of first control chip is as described
The input of first control module, the output end of first control chip passes through first current-limiting resistance and described first
The base stage connection of NPN type triode, the colelctor electrode of first NPN type triode is connected with the negative electrode of first diode,
The anode of first diode is used as the output end of 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 passes 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 used 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, the input of second control chip is as described
The input of second control module, the output end of second control chip passes through second current-limiting resistance and described second
The base stage connection of NPN type triode, the colelctor electrode of second NPN type triode is connected with the negative electrode of second diode,
The anode of second diode is used as the output end of 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 are used as second control module
Input, the second end of second current-limiting resistance is connected with the base stage of first 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,
The anode of second diode is used as the output end of second control module, the emitter stage of second NPN type triode
Ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710418303.9A CN107069655B (en) | 2017-06-06 | 2017-06-06 | Voltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710418303.9A CN107069655B (en) | 2017-06-06 | 2017-06-06 | Voltage protection circuit |
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| CN107069655B CN107069655B (en) | 2020-11-27 |
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| CN107911059A (en) * | 2017-12-08 | 2018-04-13 | 成都互聚科技有限公司 | A kind of motor-drive circuit with driving tube defencive function |
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| CN110556373A (en) * | 2018-06-01 | 2019-12-10 | 英飞凌科技股份有限公司 | Rectifier device |
| CN111174390A (en) * | 2020-02-17 | 2020-05-19 | 珠海格力电器股份有限公司 | Power taking circuit, wire controller, air conditioner and resistance control method |
| CN111464169A (en) * | 2020-04-13 | 2020-07-28 | 厦门厦华科技有限公司 | Logic power supply switch control circuit |
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| CN107069655B (en) | 2020-11-27 |
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