CN106602533A - Overvoltage protection circuit used for power distribution cabinet - Google Patents
Overvoltage protection circuit used for power distribution cabinet Download PDFInfo
- Publication number
- CN106602533A CN106602533A CN201611149361.8A CN201611149361A CN106602533A CN 106602533 A CN106602533 A CN 106602533A CN 201611149361 A CN201611149361 A CN 201611149361A CN 106602533 A CN106602533 A CN 106602533A
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- Prior art keywords
- voltage
- circuit
- input
- detection circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention belongs to the technical field of protection circuits, particularly relates to an overvoltage protection circuit used for a power distribution circuit, and includes a power supply voltage sampling circuit, a reference voltage circuit, an overvoltage detection circuit, an execution circuit and an electronic element. The power supply voltage sampling circuit is used for converting an alternating voltage into a direct supply voltage, the direct supply voltage is input to the overvoltage detection circuit, the reference voltage circuit is used for converting a supply voltage into a reference voltage, the reference voltage is input to the overvoltage detection circuit, the output end of the overvoltage detection circuit is electrically connected with the input end of the execution circuit, and the output end of the execution circuit is electrically connected with the input end of the electronic element. According to the overvoltage protection circuit used for the power distribution cabinet, when the overvoltage detection circuit detects that the power supply voltage is higher than the reference voltage, the overvoltage detection circuit controls the execution circuit cut-off, thereby realizing protection of the electronic element when an abnormal phenomenon of overvoltage occurs in the power distribution cabinet, and preventing the electronic element from being damaged.
Description
Technical field
The present invention relates to overvoltage crowbar technical field, specially a kind of overvoltage crowbar for power distribution cabinet.
Background technology
Power distribution cabinet (case) sub-power power distribution cabinet (case) and light distribution cabinet (case), metering cabinet (case), are the ends of distribution system
Level equipment.Power distribution cabinet is the general designation of motor control center.Power distribution cabinet is used in the occasion that duty ratio is relatively decentralized, loop is less；
Motor control center is used for the occasion that load is concentrated, loop is more.Their electric energy a certain circuit of upper level controller switching equipment
Distribute to load nearby.This grade of equipment reply load provides protection, monitoring and controls.But when power distribution cabinet operationally, if
The supply voltage of a certain circuit of upper level controller switching equipment is unstable, and when particularly supply voltage is raised suddenly, possible punch through damage is matched somebody with somebody
Electronic component in electric cabinet to user so that bring loss.
The content of the invention
It is an object of the invention to provide a kind of overvoltage crowbar for power distribution cabinet, to solve above-mentioned background technology in
The problem of proposition.
For achieving the above object, the present invention provides following technical scheme：
A kind of overvoltage crowbar for power distribution cabinet, including supply voltage sample circuit, reference voltage circuit, overvoltage inspection
Slowdown monitoring circuit, execution circuit and electronic component, the supply voltage sample circuit is used to for alternating voltage to be converted to direct current supply electricity
Pressure, and direct current supply control source is to over-voltage detection circuit, the supply voltage sample circuit includes two terminals B1 and B2, bridge
Formula rectification circuit and current regulator diode D1, two terminals B1 and B2 are connected to alternating current power supply, and bridge rectifier includes two inputs
End 100, cathode output end 101 and cathode output end 102, two inputs 100 are connected to two terminals B1 and B2, cathode output end
Resistance R1, potentiometer RP1 and current regulator diode D1, potentiometer RP1 and constant current two are connected between 101 and cathode output end 102
Detecting voltage end Vi is provided between pole pipe D1, the reference voltage circuit is used to for supply voltage to be converted to reference voltage V 0, and
Reference voltage V 0 is input to over-voltage detection circuit, and the reference voltage circuit includes resistance R2, three-terminal voltage-stabilizing pipe U0, resistance R2 mono-
Termination power voltage, the input of another termination three-terminal voltage-stabilizing pipe U0, the earth terminal ground connection of three-terminal voltage-stabilizing pipe U0, three-terminal voltage-stabilizing pipe
The outfan output reference voltage V0 of U0, the outfan of the over-voltage detection circuit is electrically connected with execution circuit input, described
Over-voltage detection circuit includes divider resistance R3 and operational amplifier U, and divider resistance R3 one end electrically connects with detecting voltage end Vi, separately
One end electrically connects with the normal phase input end of operational amplifier U, and the inverting input input reference voltage V0 of operational amplifier U,
The outfan of the execution circuit is electrically connected with electronic component input.
Preferably, the over-voltage detection circuit also includes diode D2, and the positive pole of diode D2 connects operational amplifier U's
Outfan, negative pole connects the input of execution circuit.
Preferably, the divider resistance R3 connects the first input end of the one end for over-voltage detection circuit of detecting voltage end Vi,
The inverting input of operational amplifier U is the second input of over-voltage detection circuit, and the outfan of operational amplifier U is overvoltage inspection
The outfan of slowdown monitoring circuit.
Preferably, the execution circuit includes that resistance R4 and audion Q1, resistance R4 mono- terminate base stage b of audion Q1,
Resistance R4 connects the outfan of over-voltage detection circuit, and the emitter e ground connection of audion Q1, audion away from one end of audion Q1
The colelctor electrode c of Q1 connects electronic component input.
Compared with prior art, the invention has the beneficial effects as follows：The present invention, when using, in over-voltage detection circuit base is input into
Quasi- voltage, while the supply voltage at over-voltage detection circuit monitoring voltage sense terminal Vi, when the inverting input of operational amplifier U
Supply voltage be higher than reference voltage when, operational amplifier U output high level, high level Jing diodes D1 and divider resistance R4 pass
After defeated, export to base stage b of audion Q1, audion Q1 conductings, the electronic component being connected with audion Q1 colelctor electrode c stops work
Make, so as to realize protection of the power distribution cabinet when there is the abnormal phenomena of overvoltage to electronic component, it is to avoid electronic component is damaged.
Description of the drawings
Fig. 1 is the concrete schematic diagram of overvoltage crowbar of the present invention；
Fig. 2 is the theory diagram of overvoltage crowbar of the present invention.
In figure：1 supply voltage sample circuit, 11 bridge rectifiers, 2 reference voltage circuits, 3 over-voltage detection circuits, 4 are held
Row circuit, 5 electronic components.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1-2 is referred to, the present invention provides a kind of technical scheme：
A kind of overvoltage crowbar for power distribution cabinet, including supply voltage sample circuit 1, reference voltage circuit 2, overvoltage
Detection circuit 3, execution circuit 4 and electronic component 5, supply voltage sample circuit 1 includes two terminals B1 and B2, bridge rectifier electricity
Road 11 and current regulator diode D1, two terminals B1 and B2 are connected to alternating current power supply, and bridge rectifier 11 includes two inputs
100th, cathode output end 101 and cathode output end 102, two inputs 100 are connected to two terminals B1 and B2, cathode output end
Resistance R1, potentiometer RP1 and current regulator diode D1 are connected between 101 and cathode output end 102.
Wherein, bridge rectifier 11 can adopt bridge rectifier, and its rectification efficiency is high, good stability, maximal integer mass flow electricity
From 0.5A to 50A, highest peak-inverse voltage is from 50V to 1000V for stream；Potentiometer RP1 concrete operations are：Regulator potentiometer RP1
Turning handle or during sliding handle, movable contact slides on resistive element, and now the outfan in potentiometer RP1 can be obtained and potentiometer RP1
The output voltage of applied voltage and moveable arm corner or stroke into certain relation；Current regulator diode D1 constant currents performance is good, price compared with
It is low, easy to use, and with very high motional impedance, detecting voltage end is provided between potentiometer RP1 and current regulator diode D1
Vi, is used to for alternating voltage to be converted to direct current supply voltage by supply voltage sample circuit 1, and direct current supply control source is arrived
Over-voltage detection circuit 3.
Reference voltage circuit 2 includes resistance R2, three-terminal voltage-stabilizing pipe U0, the termination supply voltages of resistance R2 mono-, another termination three
The input of end stabilivolt U0, the earth terminal ground connection of three-terminal voltage-stabilizing pipe U0, the outfan output reference voltage of three-terminal voltage-stabilizing pipe U0
V0, wherein, three-terminal voltage-stabilizing pipe U0 is that one kind all has very high-resistance semiconductor device before critical breakdown reverse voltage, surely
, in reverse breakdown, in certain current range (in other words in the range of certain power attenuation), terminal voltage is hardly for pressure pipe
Become, voltage regulation performance is good, be used to for supply voltage to be converted to reference voltage V 0 by reference voltage circuit 2, and reference voltage V 0 is defeated
Enter to over-voltage detection circuit 3.
Over-voltage detection circuit 3 includes divider resistance R3 and operational amplifier U, divider resistance R3 one end and detecting voltage end Vi
Electrical connection, the other end is electrically connected with the normal phase input end of operational amplifier U, and the inverting input input base of operational amplifier U
Quasi- voltage V0, over-voltage detection circuit 3 also includes diode D2, and the positive pole of diode D2 connects the outfan of operational amplifier U, bears
Pole connects the input of execution circuit 4, and divider resistance R3 connects first input of the one end for over-voltage detection circuit 3 of detecting voltage end Vi
End, the inverting input of operational amplifier U is the second input of over-voltage detection circuit 3, and the outfan of operational amplifier U was
The outfan of pressure detection circuit 3, the outfan of over-voltage detection circuit 3 is electrically connected with the input of execution circuit 4, and execution circuit 4 is wrapped
Resistance R4 and audion Q1 is included, resistance R4 mono- terminates base stage b of audion Q1, and resistance R4 takes over pressure away from one end of audion Q1
The outfan of detection circuit 3, and the emitter e ground connection of audion Q1, the colelctor electrode c of audion Q1 connects the input of electronic component 5.
Wherein, over-voltage detection circuit 3 controls the conducting of execution circuit 4 and cuts according to the reference voltage and supply voltage of input
Only, specially：When the supply voltage of the inverting input of operational amplifier U is higher than reference voltage, operational amplifier U outputs are high
Level, high level is exported to base stage b of audion Q1 Jing after diode D1 and divider resistance R4 transmission, and audion Q1 is turned on, with
Audion Q1 colelctor electrodes c connection electronic component 5 quit work, so as to realize power distribution cabinet occur overvoltage abnormal phenomena when pair
The protection of electronic component 5, it is to avoid electronic component 5 is damaged.The outfan of execution circuit 4 is electrically connected with the input of electronic component 5
Connect.
The present invention specific workflow be：When using, in the input reference voltage of over-voltage detection circuit 3, while overvoltage inspection
Supply voltage at the monitoring voltage sense terminal Vi of slowdown monitoring circuit 3, when the supply voltage of the inverting input of operational amplifier U is higher than base
During quasi- voltage, operational amplifier U output high level, high level is exported to three poles Jing after diode D1 and divider resistance R4 transmission
Base stage b of pipe Q1, audion Q1 conductings, the electronic component 5 being connected with audion Q1 colelctor electrode c quits work, so as to realize matching somebody with somebody
Protection of the electric cabinet when the abnormal phenomena of overvoltage occur to electronic component 5, it is to avoid electronic component 5 is damaged.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention be defined by the appended.
Claims (4)
1. a kind of overvoltage crowbar for power distribution cabinet, including supply voltage sample circuit (1), reference voltage circuit (2), mistake
Pressure detection circuit (3), execution circuit (4) and electronic component (5), it is characterised in that：The supply voltage sample circuit (1) is used for
Alternating voltage is converted to into direct current supply voltage, and direct current supply control source to over-voltage detection circuit (3), the supply voltage
Sample circuit (1) includes two terminals B1 and B2, bridge rectifier (11) and current regulator diode D1, and two terminals B1 and B2 connect
It is connected to alternating current power supply, bridge rectifier (11) includes two inputs 100, cathode output end 101 and cathode output end 102, two
Input 100 is connected to two terminals B1 and B2, and resistance R1, electricity are connected between cathode output end 101 and cathode output end 102
Position device RP1 and current regulator diode D1, is provided with detecting voltage end Vi, the benchmark electricity between potentiometer RP1 and current regulator diode D1
Volt circuit (2) by supply voltage for being converted to reference voltage V 0, and reference voltage V 0 is input to over-voltage detection circuit (3), institute
Reference voltage circuit (2) is stated including resistance R2, three-terminal voltage-stabilizing pipe U0, the termination supply voltages of resistance R2 mono-, the end of another termination three is steady
The input of pressure pipe U0, the earth terminal ground connection of three-terminal voltage-stabilizing pipe U0, the outfan output reference voltage V0 of three-terminal voltage-stabilizing pipe U0, institute
The outfan for stating over-voltage detection circuit (3) is electrically connected with execution circuit (4) input, the over-voltage detection circuit (3) including point
Piezoresistance R3 and operational amplifier U, divider resistance R3 one end electrically connects with detecting voltage end Vi, the other end and operational amplifier U
Normal phase input end electrical connection, and the inverting input input reference voltage V0 of operational amplifier U, the execution circuit (4)
Outfan is electrically connected with electronic component (5) input.
2. a kind of overvoltage crowbar for power distribution cabinet according to claim 1, it is characterised in that：The overvoltage detection
Circuit (3) also includes diode D2, and the positive pole of diode D2 connects the outfan of operational amplifier U, and negative pole connects execution circuit (4)
Input.
3. a kind of overvoltage crowbar for power distribution cabinet according to claim 1, it is characterised in that：The divider resistance
R3 connects the first input end of the one end for over-voltage detection circuit (3) of detecting voltage end Vi, and the inverting input of operational amplifier U is
Second input of over-voltage detection circuit (3), the outfan of operational amplifier U is the outfan of over-voltage detection circuit (3).
4. a kind of overvoltage crowbar for power distribution cabinet according to claim 1, it is characterised in that：The execution circuit
(4) including resistance R4 and audion Q1, resistance R4 mono- terminates base stage b of audion Q1, the one end of resistance R4 away from audion Q1
The outfan of over-voltage detection circuit (3), and the emitter e ground connection of audion Q1 are connect, the colelctor electrode c of audion Q1 connects electronic component
(5) input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611149361.8A CN106602533A (en) | 2016-12-14 | 2016-12-14 | Overvoltage protection circuit used for power distribution cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611149361.8A CN106602533A (en) | 2016-12-14 | 2016-12-14 | Overvoltage protection circuit used for power distribution cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106602533A true CN106602533A (en) | 2017-04-26 |
Family
ID=58801163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611149361.8A Pending CN106602533A (en) | 2016-12-14 | 2016-12-14 | Overvoltage protection circuit used for power distribution cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106602533A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382944A (en) * | 2020-10-28 | 2021-02-19 | 深圳易通技术股份有限公司 | 5GAAU intelligent logic operation power supply system |
| CN112865027A (en) * | 2020-12-31 | 2021-05-28 | 国家电网有限公司 | Direct current power supply system for power monitoring |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2170594Y (en) * | 1993-10-19 | 1994-06-29 | 赵冰 | Distributing box for residential building |
| CN101968459A (en) * | 2010-08-23 | 2011-02-09 | 上海市电力公司超高压输变电公司 | Detection method and detection device of internal faults of switch cabinet |
| CN103872658A (en) * | 2014-04-03 | 2014-06-18 | 湖南星球智能电气科技开发有限公司 | Multifunctional self-recovery over-voltage and under-voltage protector |
| CN105633905A (en) * | 2014-10-27 | 2016-06-01 | 深圳市兰丁科技有限公司 | Overvoltage and under-voltage protection circuit |
| CN205622200U (en) * | 2016-04-20 | 2016-10-05 | 北京泛华新兴体育产业股份有限公司 | Circuit and switch board with overvoltage protection |
-
2016
- 2016-12-14 CN CN201611149361.8A patent/CN106602533A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2170594Y (en) * | 1993-10-19 | 1994-06-29 | 赵冰 | Distributing box for residential building |
| CN101968459A (en) * | 2010-08-23 | 2011-02-09 | 上海市电力公司超高压输变电公司 | Detection method and detection device of internal faults of switch cabinet |
| CN103872658A (en) * | 2014-04-03 | 2014-06-18 | 湖南星球智能电气科技开发有限公司 | Multifunctional self-recovery over-voltage and under-voltage protector |
| CN105633905A (en) * | 2014-10-27 | 2016-06-01 | 深圳市兰丁科技有限公司 | Overvoltage and under-voltage protection circuit |
| CN205622200U (en) * | 2016-04-20 | 2016-10-05 | 北京泛华新兴体育产业股份有限公司 | Circuit and switch board with overvoltage protection |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382944A (en) * | 2020-10-28 | 2021-02-19 | 深圳易通技术股份有限公司 | 5GAAU intelligent logic operation power supply system |
| CN112865027A (en) * | 2020-12-31 | 2021-05-28 | 国家电网有限公司 | Direct current power supply system for power monitoring |
| CN112865027B (en) * | 2020-12-31 | 2023-02-24 | 国家电网有限公司 | Direct current power supply system for power monitoring |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170426 |