CN206323125U - A kind of AC overvoltage crowbars with auto-lock function - Google Patents
A kind of AC overvoltage crowbars with auto-lock function Download PDFInfo
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- CN206323125U CN206323125U CN201621455381.3U CN201621455381U CN206323125U CN 206323125 U CN206323125 U CN 206323125U CN 201621455381 U CN201621455381 U CN 201621455381U CN 206323125 U CN206323125 U CN 206323125U
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Abstract
The utility model is related to electric power network technique field, disclose a kind of AC overvoltage crowbars with auto-lock function, including the over-pressed detection modules of AC, first switch pipe and self-locking control module, when input ac voltage exceedes the scope allowed, AC overvoltage detection modules detect the alternating voltage overvoltage of input, and high level is exported by the first output end of the over-pressed detection modules of AC, so that first switch pipe is turned on, so that voltage output end exports a low level, turned off using low level control power supply IC, cut-out is connected to the power network of electric equipment, so that it is guaranteed that the safety of power network and electric equipment；Simultaneously, due to the conducting of first switch pipe, so that the 3rd output end output high level of self-locking control module, and then make it that first switch pipe maintains conducting always, so that voltage output end exports low level always, power supply IC off state is locked, until whole circuit could be unlocked after re-powering.
Description
Technical field
The utility model is related to electric power network technique field, more particularly to a kind of AC overvoltage protections electricity with auto-lock function
Road.
Background technology
Often there is fluctuation in power network, when the fluctuation of power network has exceeded the scope allowed in use, Jiu Huizao
Run into power network and the electric equipment of user under conditions of voltage is higher, i.e., it is uneconomical, it is also dangerous.
At present, it is general to go to detect the input state of power network using voltage transformer, when power network occurs abnormal, pass through voltage
The break-make of transformer control relay, and then control to be connected to the break-make of the power network of electric equipment, so as to protect power network and electrical equipment
The safety of equipment.But, because the appliance life of relay is shorter, and the volume of voltage transformer and relay is larger, unfavorable
In the layout of power-supply system, so as to cause circuit complexity, reliability is relatively low and cost is higher；Simultaneously as prior art does not have
Standby self-lock protection function, when power network fluctuation is more frequent, electric equipment meeting frequent starting, so as to cause the use of electric equipment
Service life reduction.
Utility model content
The purpose of this utility model is to provide a kind of AC overvoltage crowbars with auto-lock function, is solving due to power network
Extremely power network and electric equipment are caused while the technical problem run under conditions of voltage is higher so that there should be self-locking
The AC overvoltage crowbars of function are simple in construction, reliability is higher and possesses self-lock protection function, so as to ensure power network and electrical equipment
The safety of equipment simultaneously reduces cost.
In order to solve the above-mentioned technical problem, the utility model provides a kind of AC overvoltage crowbars with auto-lock function,
The AC overvoltage crowbars with auto-lock function have live wire input, zero line input, the first power end and voltage
Output end；The AC overvoltage crowbars with auto-lock function include the over-pressed detection modules of AC, first switch pipe and self-locking
Control module；The over-pressed detection module of the AC have first input end, the second input, second source end, the first common port with
And first output end；The first switch pipe has the first control end, the second common port and the second output end；It is described from lock control
Molding block has the 3rd power end, the 3rd input and the 3rd output end；
The first input end of the over-pressed detection modules of the AC is connected with the live wire input, the over-pressed detection modules of the AC
The second input be connected with the zero line input, the second source end of the over-pressed detection module of the AC and first power supply
End connection, the first common end grounding of the over-pressed detection modules of the AC, the first output end of the over-pressed detection modules of the AC and institute
State the first control end connection of first switch pipe；
Second common end grounding of the first switch pipe, the second output end of the first switch pipe connects the voltage
Output end；
3rd power end of the self-locking control module is connected with first power end, and the of the self-locking control module
Three inputs are connected with the second output end of the first switch pipe, the 3rd output end of the self-locking control module and described the
The first control end connection of one switching tube.
Preferably, the first switch pipe is NPN triode；First control end of the first switch pipe is institute
The base stage of NPN triode is stated, the second common port of the first switch pipe is the emitter stage of the NPN triode, described first
Second output end of switching tube is the colelctor electrode of the NPN triode.
Preferably, the self-locking control module includes first resistor, second resistance, second switch pipe and the 3rd
Resistance；The second switch pipe has the second control end, the 3rd common port and the 4th output end；
Second control end of the second switch pipe is connected with the 3rd power end of the self-locking control module, and described second
Second control end of switching tube is also connected by the first resistor with the 3rd common port of the second switch pipe, and described second
3rd common port of switching tube is connected by the second resistance with the 3rd input of the self-locking control module, and described second
4th output end of switching tube is connected by the 3rd resistor with the 3rd output end of the self-locking control module.
Preferably, the over-pressed detection modules of the AC include rectification module, the first division module, controllable accurate voltage stabilizing
Source, the second division module, the 3rd switching tube and the 3rd division module；3rd switching tube has the 3rd control end, the 4th
Common port and the 5th output end；The controllable accurate source of stable pressure has the 4th control end, the 5th common port and the 6th output
End；The rectification module has the 4th input, the 5th input and the 7th output end；First division module has the
Six inputs, the 8th output end and the 5th control end；Second division module have the 7th input, the 9th output end with
And for controlling the 6th control end of the 3rd switching tube conducting；3rd division module has the 8th input, the tenth
Output end and the 7th control end for controlling the first switch pipe conducting；
4th input of the rectification module is connected with the first input end of the over-pressed detection modules of the AC, the rectification
5th input of module is connected with the second input of the over-pressed detection modules of the AC, the 7th output end of the rectification module
It is connected with the 6th input of first division module；8th output end of first division module is examined with AC overvoltages
Survey the first common port connection of module, the 5th control end of first division module and the 4th control of the controllable source of stable pressure
End connection；First common port of the over-pressed detection module of the 5th common port of the controllable source of stable pressure and the AC is connected, it is described can
6th output end of control source of stable pressure is connected with the 9th output end of second division module；
7th input of second division module is connected with the second source end of the over-pressed detection modules of the AC, described
6th control end of the second division module is connected with the 3rd control end of the 3rd switching tube；The 4th of 3rd switching tube
The second source end of the over-pressed detection module of common port and the AC be connected, the 5th output end of the 3rd switching tube and described the
The 8th input connection of three division modules；Tenth output end of the 3rd division module and the over-pressed detection modules of the AC
First common port is connected, and the 7th control end and the first output end of the over-pressed detection modules of the AC of the 3rd division module connect
Connect.
Preferably, the controllable accurate source of stable pressure is TL431；4th control end of the controllable accurate source of stable pressure
For the reference pole of the TL431, the 5th common port of the controllable accurate source of stable pressure is the anode of the TL431, described controllable
6th output end of precision voltage regulator is the negative electrode of the TL431.
Preferably, the rectification module includes the first diode and the second diode；First diode
Positive pole is connected with the 4th input of the rectification module, the negative pole of first diode and the 7th of the rectification module the defeated
Go out end connection；The positive pole of second diode is connected with the 5th input of the rectification module, second diode
Negative pole is connected with the 7th output end of the rectification module.
Preferably, first division module includes the 4th resistance and the 5th resistance；The of 4th resistance
One end is connected with the 6th input of first division module, the second end of the 4th resistance by the 5th resistance with
The 8th output end connection of first division module, the second end of the 4th resistance and the 5th of first division module the
Control end is connected.
Preferably, second division module includes the 6th resistance and the 7th resistance；The of 6th resistance
One end is connected with the 7th input of second division module, the second end of the 6th resistance by the 7th resistance with
The 9th output end connection of second division module, the second end of the 6th resistance and the 6th of second division module the
Control end is connected.
Preferably, the 3rd division module includes the 8th resistance and the 9th resistance；The of 8th resistance
One end is connected with the 8th input of the 3rd division module, the second end of the 8th resistance by the 9th resistance with
The tenth output end connection of 3rd division module, the second end of the 8th resistance and the 7th of the 3rd division module the
Control end is connected.
Preferably, the AC overvoltage crowbars with auto-lock function also include the 3rd diode；
Second output end of the first switch pipe connects the voltage output end：The of the first switch pipe
Two output ends are connected with the negative pole of the 3rd diode, and the positive pole of the 3rd diode connects the voltage output end.
The AC overvoltage crowbars with auto-lock function that the utility model is provided, the AC overvoltage protections with auto-lock function
Circuit has live wire input, zero line input, the first power end and voltage output end；AC overvoltages with auto-lock function are protected
Protection circuit includes the over-pressed detection modules of AC, first switch pipe and self-locking control module；AC overvoltage detection modules are defeated with first
Enter end, the second input, second source end, the first common port and the first output end；First switch pipe have the first control end,
Second common port and the second output end；Self-locking control module has the 3rd power end, the 3rd input and the 3rd output end；
The first input end of AC overvoltage detection modules is connected with the live wire input, the second input of AC overvoltage detection modules and institute
The connection of zero line input is stated, the second source end of AC overvoltage detection modules is connected with first power end, AC overvoltage detection moulds
First common end grounding of block, the first output end and the first control end of the first switch pipe of AC overvoltage detection modules connect
Connect；Second common end grounding of first switch pipe, the second output end connection voltage output end of first switch pipe；From lock control mould
3rd power end of block is connected with the first power end, the 3rd input of self-locking control module and the second output of first switch pipe
End connection, the 3rd output end of self-locking control module is connected with the first control end of first switch pipe.When input ac voltage is super
When crossing the scope allowed, AC overvoltage detection modules detect the alternating voltage overvoltage of input, and pass through the over-pressed detection modules of AC
First output end exports high level so that first switch pipe is turned on, so that voltage output end exports a low level, utilizes
Low level control power supply IC is turned off, and cut-out is connected to the power network of electric equipment, so that it is guaranteed that the safety of power network and electric equipment；
Simultaneously as first switch pipe is turned on so that the 3rd output end output high level of self-locking control module, and then make it that first opens
Close pipe and maintain conducting always, so that voltage output end exports low level always, lock power supply IC off state, until
Whole circuit could be unlocked after re-powering, it is to avoid because power network fluctuation is relatively more frequent cause electric equipment frequent starting,
So as to improve the service life of electric equipment.Further, since should have the AC overvoltage crowbars of auto-lock function simple in construction
And reliability is higher, therefore cost is relatively low.
Brief description of the drawings
Fig. 1 is the circuit diagram of the AC overvoltage crowbars with auto-lock function in the utility model embodiment.
Embodiment
With reference to the accompanying drawings and examples, embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to scope of the present utility model.
As shown in figure 1, a kind of AC overvoltage crowbars with auto-lock function of the utility model preferred embodiment, described
AC overvoltage crowbars with auto-lock function have live wire input L, zero line input N, the first power end V1 and voltage
Output end IC-PIN；The AC overvoltage crowbars with auto-lock function include the over-pressed detection modules 1 of AC, first switch pipe Q1
And self-locking control module 2；The over-pressed detection module 1 of the AC has first input end, the second input, second source end, the
One common port and the first output end；The first switch pipe Q1 has the first control end, the second common port and the second output
End；The self-locking control module 2 has the 3rd power end, the 3rd input and the 3rd output end；The AC overvoltages detection mould
The first input end of block 1 is connected with the live wire input L, the second input and described zero of the over-pressed detection modules 1 of the AC
Line input N connections, the second source end of the over-pressed detection modules 1 of the AC is connected with the first power end V1, the AC mistakes
Press the first common end grounding of detection module 1, the first output end and the first switch pipe Q1 of the over-pressed detection modules 1 of the AC
The first control end connection；The second common end grounding of the first switch pipe Q1, the second output of the first switch pipe Q1
The end connection voltage output end IC-PIN；3rd power end of the self-locking control module 1 connects with the first power end V1
Connect, the 3rd input of the self-locking control module 2 is connected with the second output end of the first switch pipe Q1, it is described from lock control
3rd output end of molding block 2 is connected with the first control end of the first switch pipe Q1.
The AC overvoltage crowbars with auto-lock function that the utility model is provided, when input ac voltage exceedes what is allowed
During scope, the over-pressed detection modules 1 of the AC detect the alternating voltage overvoltage of input, and pass through the over-pressed detection modules 1 of the AC
The first output end output high level so that first switch pipe Q1 conducting so that the voltage output end IC-PIN
A low level is exported, is turned off using low level control power supply IC, cut-out is connected to the power network of electric equipment, so that it is guaranteed that electric
The safety of net and electric equipment；Simultaneously as the first switch pipe Q1 conductings so that the 3rd of the self-locking control module 2
Output end exports high level, and then make it that the first switch pipe Q1 maintains conducting always, so that the voltage output end
IC-PIN exports low level always, locks power supply IC off state, until whole circuit could be unlocked after re-powering, keeps away
Exempt from because power network fluctuation relatively frequently causes electric equipment frequent starting, so as to improve the service life of electric equipment.
Further, since should have, the AC overvoltage crowbars of auto-lock function were simple in construction and reliability is higher, therefore cost is relatively low.
In the utility model embodiment, in order that the design of the AC overvoltage crowbars with auto-lock function is simple
Change, to reduce cost, it is preferable that the first switch pipe Q1 in the present embodiment is NPN triode；The first switch pipe Q1
The first control end be the NPN triode base stage, the second common port of the first switch pipe Q1 is the NPN triode
Emitter stage, the second output end of the first switch pipe Q1 is the colelctor electrode of the NPN triode.
As shown in figure 1, in order to realize that the first switch pipe Q1 maintains conducting always using the self-locking control module 2,
So that the self-locking control module 2 that the voltage output end IC-PIN is exported in low level, the present embodiment always includes
First resistor R1, second resistance R2, second switch pipe Q2 and 3rd resistor R3；The second switch pipe Q2 has the second control
End, the 3rd common port and the 4th output end；The second control end of the second switch pipe Q2 and the self-locking control module 2
3rd power end is connected, and the second control end of the second switch pipe Q2 also passes through the first resistor R1 and the second switch
Pipe Q2 the 3rd common port connection, the 3rd common port of the second switch pipe Q2 passes through the second resistance R2 and the self-locking
The 3rd input connection of control module 2, the 4th output end of the second switch pipe Q2 passes through the 3rd resistor R3 and institute
State the 3rd output end connection of self-locking control module 2.Because the first output end of the first switch pipe Q1 exports low level, make
Second switch pipe Q2 conducting, the 4th output end output high level of the second switch pipe Q2, and then cause described the
One switching tube Q1 maintains conducting always, so that the voltage output end IC-PIN exports low level always, locks the power supply
IC off state.
In the utility model embodiment, in order that the design of the AC overvoltage crowbars with auto-lock function is simple
Change, to reduce cost, it is preferable that the Q2 of second switch pipe described in the present embodiment is the first PNP triode；The second switch pipe
Q2 the second control end is the emitter stage of first PNP triode, and the 3rd common port of the second switch pipe Q2 is described
The base stage of first PNP triode, the 4th output end of the second switch pipe Q2 is the colelctor electrode of first PNP triode
As shown in figure 1, the alternating voltage overvoltage in order to detect input using the over-pressed detection modules 1 of the AC so that institute
First switch pipe Q1 conductings are stated, so that the voltage output end IC-PIN exports the institute in a low level, the present embodiment
Stating the over-pressed detection modules 1 of AC includes rectification module 11, the first division module 12, controllable accurate source of stable pressure U1, the second division module
13rd, the 3rd switching tube Q3 and the 3rd division module 14；The 3rd switching tube Q3 have the 3rd control end, the 4th common port with
And the 5th output end；The controllable accurate source of stable pressure U1 has the 4th control end, the 5th common port and the 6th output end；It is described
Rectification module 11 has the 4th input, the 5th input and the 7th output end；First division module 12 has the 6th
Input, the 8th output end and the 5th control end；Second division module 13 have the 7th input, the 9th output end with
And for controlling the 6th control end of the 3rd switching tube conducting；3rd division module 14 has the 8th input, the
Ten output ends and the 7th control end for controlling the first switch pipe conducting；4th input of the rectification module 11
It is connected with the first input end of the over-pressed detection modules 1 of the AC, the 5th input and the AC overvoltages of the rectification module 11
The second input connection of detection module 1, the of the 7th output end of the rectification module 11 and first division module 12
Six inputs are connected；8th output end of first division module 12 and the first common port of the over-pressed detection modules 1 of the AC
Connection, the 5th control end of first division module 12 is connected with the 4th control end of the controllable source of stable pressure U1；It is described can
Control source of stable pressure U1 the 5th common port is connected with the first common port of the over-pressed detection modules 1 of the AC, the controllable source of stable pressure U1
The 6th output end be connected with the 9th output end of second division module 13；7th input of second division module 13
End with the AC overvoltage detection module 1 second source end be connected, the 6th control end of second division module 13 with it is described
3rd switching tube Q3 the 3rd control end connection；The 4th common port of the 3rd switching tube Q3 and the over-pressed detection modules of the AC
1 second source end connection, the 5th output end of the 3rd switching tube Q3 and the 8th input of the 3rd division module 14
End connection；Tenth output end of the 3rd division module 14 is connected with the first common port of the over-pressed detection modules 1 of the AC, institute
The 7th control end for stating the 3rd division module 14 is connected with the first output end of the over-pressed detection modules 1 of the AC.Work as input AC
When voltage exceedes the scope allowed, pass through the rectification mould from the live wire input L and zero line input N alternating currents inputted
After the rectification of block 11, voltage is divided to the 4th control of the controllable accurate source of stable pressure U1 by first division module 12
End, and the voltage of the 4th control end of the controllable accurate source of stable pressure U1 is reached that 2.5V, the controllable accurate source of stable pressure U1 are led
It is logical so that the 3rd switching tube Q3 conductings, and then cause the first switch pipe Q1 conductings, so that the voltage output
IC-PIN is held to export a low level.
In the utility model embodiment, in order that the design of the AC overvoltage crowbars with auto-lock function is simple
Change, to reduce cost, it is preferable that the U1 of controllable accurate source of stable pressure described in the present embodiment is TL431；The controllable accurate source of stable pressure
U1 the 4th control end is the reference pole of the TL431, and the 5th common port of the controllable accurate source of stable pressure U1 is the TL431
Anode, the 6th output end of the controllable accurate source of stable pressure U1 is the negative electrode of the TL431.
In the utility model embodiment, in order that the design of the AC overvoltage crowbars with auto-lock function is simple
Change, to reduce cost, it is preferable that the 3rd switching tube Q3 described in the present embodiment is the second PNP triode；3rd switching tube
Q3 the 3rd control end is the emitter stage of second PNP triode, and the 4th common port of the 3rd switching tube Q3 is described
The base stage of second PNP triode, the 6th output end of the 3rd switching tube Q3 is the colelctor electrode of second PNP triode.
As shown in figure 1, in order to which the alternating current using 11 pairs of inputs of rectification module carries out rectification, to realize input
AC conversion is that the rectification module 11 in direct current, the present embodiment includes the first diode D1 and the second diode D2；
The positive pole of the first diode D1 is connected with the 4th input of the rectification module 11, the negative pole of the first diode D1
It is connected with the 7th output end of the rectification module 11；The positive pole of the second diode D2 and the 5th of the rectification module 11 the
Input is connected, and the negative pole of the second diode D2 is connected with the 7th output end of the rectification module 11.
As shown in figure 1, the conducting in order to realize the accurate controllable source of stable pressure U1 using first division module 12, this
First division module 12 in embodiment includes the 4th resistance R4 and the 5th resistance R5；The first end of the 4th resistance R4
It is connected with the 6th input of first division module 12, the second end of the 4th resistance R4 passes through the 5th resistance R5
It is connected with the 8th output end of first division module 12, the second end and first division module of the 4th resistance R4
12 the 5th control end connection.
As shown in figure 1, the conducting in order to realize the 3rd switching tube Q3 using second division module 13, this implementation
Second division module 13 in example includes the 6th resistance R6 and the 7th resistance R7；The first end of the 6th resistance R6 and institute
The 7th input connection of the second division module 13 is stated, the second end of the 6th resistance R6 passes through the 7th resistance R7 and institute
State the 9th output end connection of the second division module 13, the second end and second division module 13 of the 6th resistance R6
6th control end is connected.
As shown in figure 1, the conducting in order to realize the second switch pipe Q2 using the 3rd division module 14, this implementation
The 3rd division module 14 in example includes the 8th resistance R8 and the 9th resistance R9；The first end of the 8th resistance R8 and institute
The 8th input connection of the 3rd division module 14 is stated, the second end of the 8th resistance R8 passes through the 9th resistance R9 and institute
State the tenth output end connection of the 3rd division module 14, the second end and the 3rd division module 14 of the 8th resistance R8
7th control end is connected.
As shown in figure 1, in order to prevent the voltage superposition of the power end V1 to the voltage output end IC-PIN, this implementation
The AC overvoltage crowbars with auto-lock function in example also include the 3rd diode D3；The of the second switch pipe Q2
Two output ends connect the voltage output end IC-PIN：The second output end and the described 3rd of the second switch pipe Q2
Diode D3 negative pole connection, the positive pole of the 3rd diode D3 connects the voltage output end IC-PIN, passes through described the
Three diode D3 buffer action, prevents the voltage superposition of the power end V1 to the voltage output end IC-PIN, to ensure
The voltage output end IC-PIN exports low level.
In the utility model embodiment, in order to be filtered to the AC overvoltage crowbars with auto-lock function,
Preferably, the AC overvoltage crowbars with auto-lock function also include the first electric capacity, first electric capacity and the described 9th
Resistance R9 is in parallel.
In the utility model embodiment, for working as the situation for needing high level that the power supply IC could be controlled to turn off, this
The AC overvoltage crowbars with auto-lock function also include phase inverter described in embodiment；The positive pole of the 3rd diode D3 connects
Meeting the voltage output end IC-PIN is specifically：The positive pole of the 3rd diode D3 connects the voltage by the phase inverter
Output end IC-PIN, the low transition for being exported the second switch pipe Q2 by the phase inverter is high level, and is passed through
The voltage output end IC-PIN exports a high level to control the shut-off of the power supply IC.
In order to solve identical technical problem, the utility model also provides a kind of AC circuits, and the AC circuits have live wire
Output end and zero line output end；The AC circuits include power supply IC and the above-mentioned electricity of the AC overvoltage protections with auto-lock function
Road；The live wire input L is connected with the fire wire output end, and the zero line input N is connected with the zero line output end；Institute
The control end that voltage output end IC-PIN is stated with the power supply IC is connected.
The operation principle of the AC overvoltage crowbars with auto-lock function in the utility model embodiment is as follows：When
When input ac voltage exceedes the scope allowed, pass through institute from the live wire input L and zero line input N alternating currents inputted
State after the first diode D1 and the second diode D2 rectifications, voltage is passed through into the 4th resistance R4 and the 5th resistance
R5 is divided to the reference pole of the TL431U1, and the voltage of the reference pole of the TL431U1 is reached 2.5V, the TL431U1
Conducting so that the voltage of the power end V1 is divided to described second by the 6th resistance R6 and the 7th resistance R7
PNP triode Q3 base stage, the second PNP triode Q3 conducting, and then cause the power end V1 voltage pass through it is described
8th resistance R8 and the 9th resistance R9 are divided to the base stage of the NPN triode Q1, the NPN triode Q1 conducting, institute
The colelctor electrode output low level of NPN triode Q1 is stated, so that the voltage output end IC-PIN exports a low level, profit
Turned off with low level control power supply IC, cut-out is connected to the power network of electric equipment；Simultaneously as the NPN triode Q1 is led
It is logical so that the voltage of the power end V1 is divided to the first PNP by the first resistor R1 and the second resistance R2
Triode Q2 base stage, the first PNP triode Q2 conductings, and then ensure that the NPN triode Q1 maintains conducting always, from
And make it that the voltage output end IC-PIN exports low level always, locks power supply IC off state, until whole circuit
It could be unlocked after re-powering.
To sum up, the AC overvoltage crowbars with auto-lock function that the utility model is provided, the AC mistakes with auto-lock function
Voltage protection circuit has live wire input L, zero line input N, the first power end V1 and voltage output end IC-PIN；With certainly
The AC overvoltage crowbars of lock function include the over-pressed detection modules 1 of AC, first switch pipe Q1 and self-locking control module 2；AC mistakes
Pressing detection module 1 has first input end, the second input, second source end, the first common port and the first output end；First
Switching tube Q1 has the first control end, the second common port and the second output end；Self-locking control module 2 have the 3rd power end,
3rd input and the 3rd output end；The first input end of AC overvoltage detection modules 1 is connected with the live wire input L, AC
Second input of over-pressed detection module 1 is connected with the zero line input N, AC overvoltage detection module 1 second source end with
The first power end V1 connections, the first common end grounding of AC overvoltage detection modules 1, the first of AC overvoltage detection modules 1 is defeated
Go out end to be connected with the first control end of the first switch pipe Q1；First switch pipe Q1 the second common end grounding, first switch
Pipe Q1 the second output end connection voltage output end IC-PIN；The 3rd power end and the first power end V1 of self-locking control module 2
Connection, the 3rd input of self-locking control module 2 is connected with first switch pipe Q1 the second output end, self-locking control module 2
3rd output end is connected with first switch pipe Q1 the first control end.When input ac voltage exceedes the scope allowed, AC mistakes
Pressure detection module 1 detects the alternating voltage overvoltage of input, and exports high electricity by the first output end of the over-pressed detection modules 1 of AC
It is flat so that first switch pipe Q1 is turned on, so that voltage output end IC-PIN exports a low level, utilize the low level control
Power supply IC shut-offs processed, cut-out is connected to the power network of electric equipment, so that it is guaranteed that the safety of power network and electric equipment；Simultaneously as
First switch pipe Q1 is turned on so that the 3rd output end output high level of self-locking control module 2, and then ensures first switch pipe Q1
Conducting is maintained always, so that voltage output end IC-PIN exports low level always, locks power supply IC off state, directly
It could unlock after being re-powered to whole circuit, it is to avoid because power network fluctuation relatively frequently causes electric equipment frequently to open
It is dynamic, so as to improve the service life of electric equipment.Further, since AC overvoltage crowbars structure letter that should be with auto-lock function
List and reliability is higher, therefore cost is relatively low.
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model know-why is not departed from, some improvement and replacement can also be made, these change
Enter and replace and also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of AC overvoltage crowbars with auto-lock function, it is characterised in that the AC overvoltages with auto-lock function are protected
Protection circuit has live wire input, zero line input, the first power end and voltage output end；The AC with auto-lock function
Overvoltage crowbar includes the over-pressed detection modules of AC, first switch pipe and self-locking control module；The over-pressed detection modules of the AC
With first input end, the second input, second source end, the first common port and the first output end；The first switch pipe
With the first control end, the second common port and the second output end；The self-locking control module has the 3rd power end, the 3rd defeated
Enter end and the 3rd output end；
The first input end of the over-pressed detection module of the AC is connected with the live wire input, and the of the AC overvoltages detection module
Two inputs are connected with the zero line input, and the second source end of the over-pressed detection modules of the AC connects with first power end
Connect, the first common end grounding of the over-pressed detection module of the AC, the first output end of the over-pressed detection modules of the AC and described the
The first control end connection of one switching tube；
Second common end grounding of the first switch pipe, the second output end of the first switch pipe connects the voltage output
End；
3rd power end of the self-locking control module is connected with first power end, and the 3rd of the self-locking control module is defeated
Enter end to be connected with the second output end of the first switch pipe, the 3rd output end of the self-locking control module is opened with described first
Close the first control end connection of pipe.
2. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 1, it is characterised in that the first switch pipe
For NPN triode；First control end of the first switch pipe is the base stage of the NPN triode, the first switch pipe
Second common port is the emitter stage of the NPN triode, and the second output end of the first switch pipe is the NPN triode
Colelctor electrode.
3. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 1, it is characterised in that described from lock control mould
Block includes first resistor, second resistance, second switch pipe and 3rd resistor；The second switch pipe have the second control end,
3rd common port and the 4th output end；
Second control end of the second switch pipe is connected with the 3rd power end of the self-locking control module, the second switch
Second control end of pipe is also connected by the first resistor with the 3rd common port of the second switch pipe, the second switch
3rd common port of pipe is connected by the second resistance with the 3rd input of the self-locking control module, the second switch
4th output end of pipe is connected by the 3rd resistor with the 3rd output end of the self-locking control module.
4. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 1, it is characterised in that the AC overvoltages detection
Module includes rectification module, the first division module, controllable accurate source of stable pressure, the second division module, the 3rd switching tube and the 3rd
Division module；3rd switching tube has the 3rd control end, the 4th common port and the 5th output end；The controllable accurate is steady
Potential source has the 4th control end, the 5th common port and the 6th output end；The rectification module has the 4th input, the 5th defeated
Enter end and the 7th output end；First division module has the 6th input, the 8th output end and the 5th control end；Institute
The second division module is stated with the 7th input, the 9th output end and the 6th control for controlling the 3rd switching tube conducting
End processed；3rd division module has the 8th input, the tenth output end and for controlling the first switch pipe to turn on
The 7th control end；
4th input of the rectification module is connected with the first input end of the over-pressed detection modules of the AC, the rectification module
The second input of the over-pressed detection module of the 5th input and the AC be connected, the 7th output end of the rectification module and institute
State the 6th input connection of the first division module；8th output end of first division module and AC overvoltage detection moulds
The first common port connection of block, the 5th control end of first division module connects with the 4th control end of the controllable source of stable pressure
Connect；5th common port of the controllable source of stable pressure is connected with the first common port of the over-pressed detection modules of the AC, described controllable steady
6th output end of potential source is connected with the 9th output end of second division module；
7th input of second division module is connected with the second source end of the over-pressed detection modules of the AC, and described second
6th control end of division module is connected with the 3rd control end of the 3rd switching tube；The 4th of 3rd switching tube is public
End is connected with the second source end of the over-pressed detection modules of the AC, the 5th output end of the 3rd switching tube and described 3rd point
The 8th input connection of die block；Tenth output end of the 3rd division module and the first of the over-pressed detection modules of the AC
Common port is connected, and the 7th control end of the 3rd division module is connected with the first output end of the over-pressed detection modules of the AC.
5. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 4, it is characterised in that the controllable accurate is steady
Potential source is TL431；4th control end of the controllable accurate source of stable pressure is the reference pole of the TL431, and the controllable accurate is steady
5th common port of potential source is the anode of the TL431, and the 6th output end of the controllable accurate source of stable pressure is the TL431's
Negative electrode.
6. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 4, it is characterised in that the rectification module bag
Include the first diode and the second diode；The positive pole of first diode is connected with the 4th input of the rectification module,
The negative pole of first diode is connected with the 7th output end of the rectification module；The positive pole of second diode with it is described
The 5th input connection of rectification module, the negative pole of second diode is connected with the 7th output end of the rectification module.
7. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 4, it is characterised in that the first partial pressure mould
Block includes the 4th resistance and the 5th resistance；The first end of 4th resistance connects with the 6th input of first division module
Connect, the second end of the 4th resistance is connected by the 5th resistance with the 8th output end of first division module, institute
The second end for stating the 4th resistance is connected with the 5th control end of first division module.
8. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 4, it is characterised in that the second partial pressure mould
Block includes the 6th resistance and the 7th resistance；The first end of 6th resistance connects with the 7th input of second division module
Connect, the second end of the 6th resistance is connected by the 7th resistance with the 9th output end of second division module, institute
The second end for stating the 6th resistance is connected with the 6th control end of second division module.
9. there is the AC overvoltage crowbars of auto-lock function as claimed in claim 4, it is characterised in that the 3rd partial pressure mould
Block includes the 8th resistance and the 9th resistance；The first end of 8th resistance connects with the 8th input of the 3rd division module
Connect, the second end of the 8th resistance is connected by the 9th resistance with the tenth output end of the 3rd division module, institute
The second end for stating the 8th resistance is connected with the 7th control end of the 3rd division module.
10. the AC overvoltage crowbars with auto-lock function as described in claim any one of 1-9, it is characterised in that described
AC overvoltage crowbars with auto-lock function also include the 3rd diode；
Second output end of the first switch pipe connects the voltage output end：The second of the first switch pipe is defeated
Go out end to be connected with the negative pole of the 3rd diode, the positive pole of the 3rd diode connects the voltage output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621455381.3U CN206323125U (en) | 2016-12-28 | 2016-12-28 | A kind of AC overvoltage crowbars with auto-lock function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621455381.3U CN206323125U (en) | 2016-12-28 | 2016-12-28 | A kind of AC overvoltage crowbars with auto-lock function |
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| CN206323125U true CN206323125U (en) | 2017-07-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937738A (en) * | 2021-10-14 | 2022-01-14 | 珠海拓芯科技有限公司 | Overvoltage protection unit and overvoltage protection method for input alternating-current power supply and air conditioner |
-
2016
- 2016-12-28 CN CN201621455381.3U patent/CN206323125U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937738A (en) * | 2021-10-14 | 2022-01-14 | 珠海拓芯科技有限公司 | Overvoltage protection unit and overvoltage protection method for input alternating-current power supply and air conditioner |
| CN113937738B (en) * | 2021-10-14 | 2023-11-28 | 宁波奥克斯电气股份有限公司 | Overvoltage protection unit for input alternating current power supply, overvoltage protection method and air conditioner |
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