CN104426122A - Power grid overvoltage protection circuit - Google Patents
Power grid overvoltage protection circuit Download PDFInfo
- Publication number
- CN104426122A CN104426122A CN201310363038.0A CN201310363038A CN104426122A CN 104426122 A CN104426122 A CN 104426122A CN 201310363038 A CN201310363038 A CN 201310363038A CN 104426122 A CN104426122 A CN 104426122A
- Authority
- CN
- China
- Prior art keywords
- voltage
- input
- module
- input power
- ring body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Disclosed is a grid power overvoltage protection circuit which is used for disconnecting an input power supply during overvoltage of a power grid. The circuit includes a release and a magnetic ring body, and also includes a voltage detection module, a voltage triggering module and an on-off control module. Through the voltage detection module, a voltage which is output by the power grid to a user, that is, an input power supply of the user is detected. If the input voltage detected by the voltage detection module exceeds a voltage threshold, trigger signals are sent to the voltage triggering module. The voltage triggering module switches on after receiving the trigger signals. The on-off control module connected with the voltage triggering module is also switched on. Therefore, current passes through the magnetic ring body and magnetic flux is generated in the magnetic ring body and the release connected with the magnetic ring body executes a motion which disconnects the input power supply. Therefore, during overvoltage of the input power supply of the user, voltage output of the power grid to the user is disconnected so as to prevent damages of overvoltage on the user.
Description
Technical field
The present invention relates to overvoltage crowbar, particularly relate to a kind of simple, reliable electrical network overvoltage crowbar.
Background technology
Electrical network is in electric power system, the general designation of the facilities and equipment of contact generating and electricity consumption.Belong to the intermediate link of conveying and distribution electric energy, it is primarily of connection power transmission sequence into the net, electric substation, distribution substation and distribution line composition.Usually the Unified Global of the contact generating be made up of transmission of electricity, power transformation, controller switching equipment and corresponding auxiliary system and electricity consumption is called power network.In electric power transfer process, generally adopt high pressure, and then adopt transformer that high pressure is converted to low pressure to be supplied to user.At user's power input, when there is overvoltage, Electrical Safety problem can be caused.Such as, when the light fixture input power supply power voltage of user is too high, light fixture can be caused to burn, spill electric spark and cause the phenomenons such as fire.Therefore, irremediable infringement can be caused to user when electrical network output voltage is too high.
Summary of the invention
Based on this, be necessary to provide a kind of simple, reliable electrical network overvoltage crowbar.
A kind of electrical network overvoltage crowbar, for disconnecting input power when electrical network overvoltage, comprising release and magnetic ring body, also comprising voltage detection module, voltage triggered module and switch control module;
Described magnetic ring body two link is connected on the positive-negative power line of input power, the power input of described release connects the both positive and negative polarity of input power, the secondary output end of magnetic ring body described in the input termination of described release, described voltage detection module input termination input power supply, the input of voltage triggered module described in the output termination of described voltage detection module, the control end of switch control module described in the output termination of described voltage triggered module, the input of described switch control module and output connect the positive power line of input power respectively, wherein, the input of described switch control module and output in parallel with the primary input terminal end of described magnetic ring body,
The input power of described voltage detection module detection of grid, when the input voltage that described voltage detection module detects exceeds voltage threshold, described voltage detection module sends triggering signal to described voltage triggered module, described voltage triggered module receives triggering signal conducting, after the conducting of described voltage triggered module, described switch control module conducting, produce magnetic flux in described magnetic ring body, the release be connected with described magnetic ring body disconnects input power;
When the input voltage that described voltage detection module detects does not exceed voltage threshold, described voltage detection module does not export triggering signal, described voltage triggered module cut-off, described switch control module cut-off, do not produce magnetic flux in described magnetic ring body, the release be connected with described magnetic ring body closes.
Wherein in an embodiment, described voltage detection module comprises slide rheostat R4, charging capacitor C1 and divider resistance R3;
Described slide rheostat R4 and described divider resistance R3 is series between the both positive and negative polarity of input power, described charging capacitor C1 is parallel to the two ends of described slide rheostat R4, wherein, described slide rheostat R4 connects the positive pole of input power, and described divider resistance R3 connects the negative pole of described input power.
Wherein in an embodiment, described voltage detection module also comprises diode D1, and the positive pole of described diode D1 connects the negative pole of described input power, and the negative pole of described diode D1 meets described divider resistance R3.
Wherein in an embodiment, described voltage triggered module comprises diac D2, and the two ends of described diac D2 correspond to input and the output of described voltage triggered module.
Wherein in an embodiment, described voltage triggered module also comprises divider resistance R2, the output of voltage detection module described in a termination of described divider resistance R2, diac D2 described in another termination.
Wherein in an embodiment, described switch control module comprises bidirectional triode thyristor Q1, and the control pole of described bidirectional triode thyristor Q1, the first anode and second plate correspond to the control end of described switch control module, input and output.
Wherein in an embodiment, described switch control module also comprises divider resistance R1, and one end of described divider resistance R1 is connected with the second plate of described bidirectional triode thyristor Q1, the cathode power supply line of another termination input power.
Wherein in an embodiment, the resistance of described divider resistance R1 is 10K Ω.
Wherein in an embodiment, also comprise switch S 1, described switch S 1 is connected to the input of input power.
Above-mentioned electrical network overvoltage crowbar outputs to the voltage of user by voltage detection module detection of grid, i.e. the input power of user.If when the input voltage that voltage detection module detects exceeds voltage threshold, just send triggering signal to voltage triggered module.Conducting after voltage triggered module reception triggering signal, the switch control module also conducting with voltage triggered model calling, therefore, has electric current process in magnetic ring body, magnetic ring body produces magnetic flux, and the release be connected with magnetic ring body performs the action disconnecting input power.Thus when the overvoltage of user's input power, electrical network can be disconnected the voltage of user exported, avoid overvoltage to cause damage to user.
Accompanying drawing explanation
Fig. 1 is the module map of electrical network overvoltage crowbar;
Fig. 2 is the schematic diagram of electrical network overvoltage crowbar.
Embodiment
As shown in Figure 1, be the module map of electrical network overvoltage crowbar.
A kind of electrical network overvoltage crowbar, for disconnecting input power when electrical network overvoltage, comprises release 109, magnetic ring body 107, voltage detection module 101, voltage triggered module 103 and switch control module 105.
Described magnetic ring body 107 liang of links are connected on the positive-negative power line of input power, the power input of described release 109 connects the both positive and negative polarity of input power, the secondary output end of magnetic ring body 107 described in the input termination of described release 109, described voltage detection module 101 inputs termination input power supply, the input of voltage triggered module 103 described in the output termination of described voltage detection module 101, the control end of switch control module 105 described in the output termination of described voltage triggered module 103, the input of described switch control module 105 and output connect the positive power line of input power respectively, wherein, the input of described switch control module 105 and output in parallel with the primary input terminal of described magnetic ring body 107.
The input power of described voltage detection module 101 detection of grid, when the input voltage that described voltage detection module 101 detects exceeds voltage threshold, described voltage detection module 101 sends triggering signal to described voltage triggered module 103, described voltage triggered module 103 receives triggering signal conducting, after the conducting of described voltage triggered module 103, the conducting of described switch control module 105, produce magnetic flux in described magnetic ring body 107, the release 109 be connected with described magnetic ring body 107 disconnects input power.
When the input voltage that described voltage detection module 101 detects does not exceed voltage threshold, described voltage detection module 101 does not export triggering signal, described voltage triggered module 103 is ended, described switch control module 105 ends, do not produce magnetic flux in described magnetic ring body 107, the release 109 be connected with described magnetic ring body 107 closes.
Whether voltage detection module 101 exceedes voltage threshold for the pressure drop detecting input power.Concrete, when the pressure drop of the input power that voltage detection module 101 detects exceedes voltage threshold, voltage detection module 101 sends triggering signal to voltage triggered module 103.When the pressure drop of the input power that voltage detection module 101 detects does not exceed voltage threshold, voltage detection module 101 does not export triggering signal.
Voltage triggered module 103 controls conducting and the cut-off of self for the triggering signal that exports according to voltage detection module 101, and then the conducting of control switch control module and cut-off.Concrete, conducting when voltage triggered module 103 receives triggering signal, thus control switch control module 105 conducting.End when voltage triggered module 103 does not receive triggering signal, thus control switch control module 105 is ended.
Whether the primary input terminal that switch control module 105 controls magnetic ring body 107 by self conducting and cut-off has electric current input.Particularly, during switch control module 105 conducting, the primary input terminal of magnetic ring body 107 and the input of switch control module 105, output form complete loops, and have electric current process in magnetic ring body 107, magnetic ring body 107 produces magnetic flux.When switch control module 105 ends, the primary input terminal of magnetic ring body 107 does not have electric current to input, and magnetic ring body 107 does not produce magnetic flux.
Magnetic ring body 107 is for controlling the closed of release 109 and disconnecting, concrete, has electric current through out-of-date in magnetic ring body 107, controls release 109 and disconnects.There is no electric current in magnetic ring body 107 through out-of-date, control release 109 and close.
Whether release 109 is for controlling electrical network to user's out-put supply.
Incorporated by reference to Fig. 2.
Voltage detection module 101 comprises slide rheostat R4, charging capacitor C1 and divider resistance R3.
Described slide rheostat R4 and described divider resistance R3 is series between the both positive and negative polarity of input power, described charging capacitor C1 is parallel to the two ends of described slide rheostat R4, wherein, described slide rheostat R4 connects the positive pole of input power, and described divider resistance R3 connects the negative pole of described input power.
Voltage detection module 101 also comprises diode D1, and the positive pole of described diode D1 connects the negative pole of described input power, and the negative pole of described diode D1 meets described divider resistance R3.
Voltage triggered module 103 comprises diac D2, and the two ends of described diac D2 correspond to input and the output of described voltage triggered module 103.
Voltage triggered module 103 also comprises divider resistance R2, the output of voltage detection module 101 described in a termination of described divider resistance R2, diac D2 described in another termination.
Switch control module 105 comprises bidirectional triode thyristor Q1, and the control pole of described bidirectional triode thyristor Q1, the first anode and second plate correspond to the control end of described switch control module 105, input and output.
Switch control module 105 also comprises divider resistance R1, and one end of described divider resistance R1 is connected with the second plate of described bidirectional triode thyristor Q1, the cathode power supply line of another termination input power.
The resistance of divider resistance R1 is 10K Ω.
Electrical network overvoltage crowbar also comprises switch S 1, and described switch S 1 is connected to the input of input power.
Based on above-mentioned all embodiments, the operation principle of electrical network overvoltage crowbar is as follows:
At the power input of user, generally air switch is installed.Close air switch, internal switch S1 conducting, and electric current, is charged to charging capacitor C1 by divider resistance R3 from zero line N via diode D1 rectification.When the voltage of input power is normal, the undertension at charging capacitor C1 two ends is to make diac D2 conducting.Thus diac D2 ends, and then bidirectional triode thyristor Q1 is ended, magnetic ring body 107 no current process, can not produce magnetic flux in magnetic ring body 107, and thus release 109 closes.
When the voltage of input power exceedes voltage threshold, the voltage that charging capacitor C1 holds raises, be DB3 to reaching diac D2(model) breakover voltage VBO (representative value is 32V), enter the negative differential resistance region of diac D2 volt-ampere characteristic, diac D2 conducting, its terminal voltage declines about 5-7V immediately.Because charging capacitor C1 voltage initial value is 32V, this voltage can not suddenly change, and makes the spike voltage obtaining 5 to 7V between the control pole G of bidirectional triode thyristor Q1 and first anode T1, triggers bidirectional triode thyristor Q1 conducting.The electric current of bidirectional triode thyristor Q1 is from contact 1-divider resistance R1-bidirectional triode thyristor Q1-contact 4-switch S 1-contact 2 of input power, thus magnetic flux is produced in magnetic ring body 107, make release 109 perform disconnection action so secondary winding PQ two ends produce induced voltage.
Above-mentioned electrical network overvoltage crowbar outputs to the voltage of user by voltage detection module detection of grid, i.e. the input power of user.If when the input voltage that voltage detection module 101 detects exceeds voltage threshold, just send triggering signal to voltage triggered module 103.Voltage triggered module 103 receives conducting after triggering signal, the switch control module 105 also conducting be connected with voltage triggered module 103, therefore, has electric current to pass through in magnetic ring body 107, magnetic ring body 107 produces magnetic flux, and the release 109 be connected with magnetic ring body 107 performs the action disconnecting input power.Thus when the overvoltage of user's input power, electrical network can be disconnected the voltage of user exported, avoid overvoltage to cause damage to user.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. an electrical network overvoltage crowbar, for disconnecting input power when electrical network overvoltage, comprising release and magnetic ring body, it is characterized in that, also comprising voltage detection module, voltage triggered module and switch control module;
Described magnetic ring body two link is connected on the positive-negative power line of input power, the power input of described release connects the both positive and negative polarity of input power, the secondary output end of magnetic ring body described in the input termination of described release, described voltage detection module input termination input power supply, the input of voltage triggered module described in the output termination of described voltage detection module, the control end of switch control module described in the output termination of described voltage triggered module, the input of described switch control module and output connect the positive power line of input power respectively, wherein, the input of described switch control module and output in parallel with the primary input terminal end of described magnetic ring body,
The input power of described voltage detection module detection of grid, when the input voltage that described voltage detection module detects exceeds voltage threshold, described voltage detection module sends triggering signal to described voltage triggered module, described voltage triggered module receives triggering signal conducting, after the conducting of described voltage triggered module, described switch control module conducting, produce magnetic flux in described magnetic ring body, the release be connected with described magnetic ring body disconnects input power;
When the input voltage that described voltage detection module detects does not exceed voltage threshold, described voltage detection module does not export triggering signal, described voltage triggered module cut-off, described switch control module cut-off, do not produce magnetic flux in described magnetic ring body, the release be connected with described magnetic ring body closes.
2. electrical network overvoltage crowbar according to claim 1, is characterized in that, described voltage detection module comprises slide rheostat R4, charging capacitor C1 and divider resistance R3;
Described slide rheostat R4 and described divider resistance R3 is series between the both positive and negative polarity of input power, described charging capacitor C1 is parallel to the two ends of described slide rheostat R4, wherein, described slide rheostat R4 connects the positive pole of input power, and described divider resistance R3 connects the negative pole of described input power.
3. electrical network overvoltage crowbar according to claim 2, is characterized in that, described voltage detection module also comprises diode D1, and the positive pole of described diode D1 connects the negative pole of described input power, and the negative pole of described diode D1 meets described divider resistance R3.
4. electrical network overvoltage crowbar according to claim 1, is characterized in that, described voltage triggered module comprises diac D2, and the two ends of described diac D2 correspond to input and the output of described voltage triggered module.
5. electrical network overvoltage crowbar according to claim 4, is characterized in that, described voltage triggered module also comprises divider resistance R2, the output of voltage detection module described in a termination of described divider resistance R2, diac D2 described in another termination.
6. electrical network overvoltage crowbar according to claim 1; it is characterized in that; described switch control module comprises bidirectional triode thyristor Q1, and the control pole of described bidirectional triode thyristor Q1, the first anode and second plate correspond to the control end of described switch control module, input and output.
7. electrical network overvoltage crowbar according to claim 6; it is characterized in that; described switch control module also comprises divider resistance R1, and one end of described divider resistance R1 is connected with the second plate of described bidirectional triode thyristor Q1, the cathode power supply line of another termination input power.
8. electrical network overvoltage crowbar according to claim 7, is characterized in that, the resistance of described divider resistance R1 is 10K Ω.
9. electrical network overvoltage crowbar according to claim 1, is characterized in that, also comprises switch S 1, and described switch S 1 is connected to the input of input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310363038.0A CN104426122B (en) | 2013-08-19 | 2013-08-19 | Power network overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310363038.0A CN104426122B (en) | 2013-08-19 | 2013-08-19 | Power network overvoltage crowbar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104426122A true CN104426122A (en) | 2015-03-18 |
| CN104426122B CN104426122B (en) | 2018-02-02 |
Family
ID=52974398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310363038.0A Active CN104426122B (en) | 2013-08-19 | 2013-08-19 | Power network overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104426122B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877954A (en) * | 2017-03-03 | 2017-06-20 | 山东浪潮商用系统有限公司 | The supervising device and system of a kind of medium wave transmitter |
| CN107583823A (en) * | 2017-10-11 | 2018-01-16 | 合肥精显电子科技有限公司 | A kind of LCD liquid crystal display screen automatic dispensing device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2821982Y (en) * | 2005-09-27 | 2006-09-27 | 徐海洪 | Anti-lightning and anti-over voltage new household leak breaker |
| CN201260066Y (en) * | 2008-07-21 | 2009-06-17 | 汲怀利 | Control circuit for multifunctional protection socket |
| EP2180569A2 (en) * | 2008-10-23 | 2010-04-28 | Siemens Aktiengesellschaft | Method for protecting from excess voltage in a system attached to an electricity supply network, excess voltage protection device and assembly with such a system |
| US20100128404A1 (en) * | 2008-11-24 | 2010-05-27 | Square D Company-Schneider Electric | Improper Voltage Detection for Electronic Circuit Breaker |
| CN201813141U (en) * | 2010-09-29 | 2011-04-27 | 厦门振泰成科技有限公司 | Overvoltage protection circuit |
| CN202872329U (en) * | 2012-11-13 | 2013-04-10 | 湖南科技学院 | Circuit breaker with overvoltage protection function |
| CN202930903U (en) * | 2012-11-21 | 2013-05-08 | 重庆西南集成电路设计有限责任公司 | Overvoltage and overcurrent protection circuit |
-
2013
- 2013-08-19 CN CN201310363038.0A patent/CN104426122B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2821982Y (en) * | 2005-09-27 | 2006-09-27 | 徐海洪 | Anti-lightning and anti-over voltage new household leak breaker |
| CN201260066Y (en) * | 2008-07-21 | 2009-06-17 | 汲怀利 | Control circuit for multifunctional protection socket |
| EP2180569A2 (en) * | 2008-10-23 | 2010-04-28 | Siemens Aktiengesellschaft | Method for protecting from excess voltage in a system attached to an electricity supply network, excess voltage protection device and assembly with such a system |
| US20100128404A1 (en) * | 2008-11-24 | 2010-05-27 | Square D Company-Schneider Electric | Improper Voltage Detection for Electronic Circuit Breaker |
| CN201813141U (en) * | 2010-09-29 | 2011-04-27 | 厦门振泰成科技有限公司 | Overvoltage protection circuit |
| CN202872329U (en) * | 2012-11-13 | 2013-04-10 | 湖南科技学院 | Circuit breaker with overvoltage protection function |
| CN202930903U (en) * | 2012-11-21 | 2013-05-08 | 重庆西南集成电路设计有限责任公司 | Overvoltage and overcurrent protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877954A (en) * | 2017-03-03 | 2017-06-20 | 山东浪潮商用系统有限公司 | The supervising device and system of a kind of medium wave transmitter |
| CN107583823A (en) * | 2017-10-11 | 2018-01-16 | 合肥精显电子科技有限公司 | A kind of LCD liquid crystal display screen automatic dispensing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104426122B (en) | 2018-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202260378U (en) | Leakage protector | |
| CN105226611B (en) | Short circuit/overload protecting circuit of single-phase transformer | |
| CN212781125U (en) | Adhesion fault detection system and alternating-current charging stake of relay | |
| CN107635343B (en) | Input detection protection circuit and alternating current electronic ballast for HID lamp | |
| CN205610295U (en) | Charging circuit of lithium cell group | |
| CN202917763U (en) | Electric leakage detection protection plug | |
| CN203536652U (en) | Electric leakage protection plug with overtemperature detection | |
| CN103762557B (en) | The anti-open-circuit-protection method of current transformer | |
| CN104426122A (en) | Power grid overvoltage protection circuit | |
| CN205265230U (en) | Voltage controller is owed in outage time delay | |
| CN104953537A (en) | Overload protection switching device | |
| CN107834695B (en) | Fire-fighting equipment power supply with relay protection circuit | |
| CN203826922U (en) | An intelligent air switch device | |
| CN205882733U (en) | Automatic outage cell -phone charger | |
| CN204633617U (en) | The surge-prevention soft starting circuit of Switching Power Supply | |
| CN104901090A (en) | Voltage conversion type earth leakage protection plug | |
| CN205508744U (en) | Circuit breaker control system | |
| CN201252392Y (en) | Earth-leakage protector | |
| CN104979817B (en) | A kind of anti-error protection circuit of domestic air conditioning indoor and outdoor communication | |
| CN103474955A (en) | Earth leakage protection plug | |
| CN202503262U (en) | Electric leakage protection device | |
| CN208028564U (en) | Earth leakage protective device with over-voltage protection function | |
| CN201985508U (en) | Zero line break protector and connecting structure thereof | |
| CN204886124U (en) | Prevent overload protection switching device | |
| CN203339651U (en) | Multifunctional air switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |