CN202872328U - Power supply input voltage overvoltage protection circuit used for single-phase inverter type welder - Google Patents
Power supply input voltage overvoltage protection circuit used for single-phase inverter type welder Download PDFInfo
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- CN202872328U CN202872328U CN 201220560523 CN201220560523U CN202872328U CN 202872328 U CN202872328 U CN 202872328U CN 201220560523 CN201220560523 CN 201220560523 CN 201220560523 U CN201220560523 U CN 201220560523U CN 202872328 U CN202872328 U CN 202872328U
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Abstract
The utility model provides a power supply input voltage overvoltage protection circuit used for a single-phase inverter type welder, comprising a thyristor, wherein a power supply input voltage passes through a rectifier and a filtering capacitor and then is connected with the thyristor; when the power supply input voltage is lower than or equal to a set value, the thyristor is triggered and switched on; and when the power supply input voltage is higher than the set value, the thyristor is switched off.
Description
Technical field
The utility model belongs to power input voltage excess voltage protection technical field, is particularly useful for the power input voltage overvoltage protection of single-phase inversion electric welding machine.
Background technology
The power input voltage of single-phase inversion electric welding machine is generally about 220V, but in the more abominable countries and regions of some power grid qualities, voltage has often surpassed 220V, even reaches more than the 300V.Also have some users can use generator to power to electric welding machine, this supply voltage is more unstable, usually surpasses the normal range of operation of electric welding machine.And in use often there is the problem of wrong voltage easily in electric welding machine, and 220V voltage is received 380V voltage.Under this environment, if electric welding machine does not have overvoltage protection, that just is easy to occur leakage even the blast of electrochemical capacitor, also may cause the damage of device for power switching.In order to solve this technical problem, common employed way is in a power input piezo-resistance in parallel in the prior art, but that this way can cause detecting the precision of voltage is lower, can not play the repeatedly effect of protection simultaneously.
In view of this, be badly in need of in the prior art wanting a kind of new power input voltage over-voltage protection technique scheme, effectively protect electric welding machine in the environment of too high voltages, can use safely, prevent the circuit element damage that it causes because of overtension.
Summary of the invention
In order to overcome the technological deficiency that exists in the prior art, the utility model provides a kind of power supply for the single-phase inversion electric welding machine
The input voltage excess voltage protection can protect electric welding machine can not damage under overpressure situation.
In order to realize the foregoing invention purpose; the utility model provides a kind of power input voltage excess voltage protection for the single-phase inversion electric welding machine; this power input voltage excess voltage protection comprises a controllable silicon; this power input voltage is connected with this controllable silicon after through a rectifier and a filter capacitor; when this power input voltage is less than or equal to a set point; this controllable silicon triggering and conducting, when this power input voltage is higher than this set point, this controllable silicon cut-off.
Further, this controllable silicon is connected with a thermistor RT1 and a capacitor C 2, and during this controllable silicon triggering and conducting, this thermistor RT1 is these capacitor C 2 chargings.
Further, this controllable silicon and this thermistor RT1 are in parallel with a relay, this controllable silicon when this relay disconnects
Cut-off.
Further; this power input voltage excess voltage protection also comprises a triode Q1; one optocoupler U1; one capacitor C 3; one triode Q2; the collector electrode of this triode Q1 is connected with the input of optocoupler U1; the output of this optocoupler U1 is in parallel with capacitor C 3; these capacitor C 3 one end ground connection; the other end is connected with the base stage of this triode Q2; the collector electrode of this triode Q2 is connected with this relay; when this power input voltage is higher than this set point; this triode Q1 conducting, this optocoupler U1 starts working, the lower voltage of this capacitor C 3; this triode Q2 cut-off, this relay disconnects.
Further, the base stage of this triode Q1 is connected with divider resistance R1, R2, the emitter of this triode Q1 is connected with a voltage-stabiliser tube Z1, when this power input voltage is higher than this set point, when this power input voltage passes through divider resistance R1, R2 and punctures voltage-stabiliser tube Z1, cause this triode Q1 conducting.
Further, this silicon controlled anode is connected with a resistance R 4, and this silicon controlled negative electrode is connected with a diode D2 with controlled stage, and this silicon controlled controlled stage also is connected with a resistance R 8, and this capacitor C 2 is in parallel with a resistance R 5.
Further, the collector electrode of this triode Q1 is connected with the input of this optocoupler U1 by a piezo-resistance.
Further, this capacitor C 3 is connected with the base stage of this triode Q2 by a voltage-stabiliser tube Z2, and this relay is in parallel with a diode D3, and an end of relay is connected with power Vcc.
Further, the output of this optocoupler U1 connects a resistance R 7, and the other end of this resistance R 7 is connected with power Vcc.
Compared with prior art, the power input voltage excess voltage protection for the single-phase inversion electric welding machine provided by the utility model can protect electric welding machine can not damage under overpressure situation.This excess voltage protection has utilized the soft start relay of electric welding machine itself, increases subelement in the importation, the input voltage of the power end of restriction electric welding machine.This excess voltage protection simple in structure, cost is low, and reliability is high, and is respond well through practical proof.
Description of drawings
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Fig. 1 is the schematic diagram of the shown power input voltage overvoltage protection of the utility model.
Embodiment
Describe specific embodiments of the invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, Fig. 1 is the schematic diagram of this overvoltage crowbar.Input voltage AC220-A, the AC220-B of AC power is connected with rectifier bridge BR1.Become direct current after the alternating current process rectifier bridge BR1 rectification, again through being connected with a controllable silicon T1 after capacitor C 1 filtering.When the input voltage of AC power is voltage in the normal amplitude, during such as 220 volts, controllable silicon T1 triggering and conducting, by thermistor RT1 to capacitor C 2 chargings.When the input voltage of AC power is higher than set point, controllable silicon T1 cut-off, capacitor C 2 both end voltage remain on before the overvoltage protection, and overvoltage just can not occur for electric capacity and electric welding machine main circuit damages.When the input voltage of AC power is higher than set point, can puncture voltage-stabiliser tube Z1 through the voltage after resistance R 1 and the R2 dividing potential drop so, triode Q1 begins conducting, this moment, optocoupler U1 started working, the voltage at capacitor C 3 two ends is dragged down, triode Q2 cut-off, and relay J 1 disconnects, the voltage of controllable silicon T1 trigger electrode is dragged down by Q1, the controllable silicon cut-off.
As shown in fig. 1, the collector electrode of this triode Q1 is connected with the input of optocoupler U1, and the output of this optocoupler U1 is in parallel with capacitor C 3, these capacitor C 3 one end ground connection, the other end is connected with the base stage of this triode Q2, the collector electrode of this triode Q2 is connected with this relay, when this power input voltage is higher than this set point, and this triode Q1 conducting, this optocoupler U1 starts working, the lower voltage of this capacitor C 3, this triode Q2 cut-off, this relay disconnects.The base stage of this triode Q1 is connected with divider resistance R1, R2, the emitter of this triode Q1 is connected with a voltage-stabiliser tube Z1, when this power input voltage is higher than this set point, when this power input voltage passes through divider resistance R1, R2 and punctures voltage-stabiliser tube Z1, cause this triode Q1 conducting.This silicon controlled anode is connected with a resistance R 4, and this silicon controlled negative electrode is connected with a diode D2 with controlled stage, and this silicon controlled controlled stage also is connected with a resistance R 8, and this capacitor C 2 is in parallel with a resistance R 5.The collector electrode of this triode Q1 is connected with the input of this optocoupler U1 by a piezo-resistance.This capacitor C 3 is connected with the base stage of this triode Q2 by a voltage-stabiliser tube Z2, and this relay is in parallel with a diode D3, and an end of relay is connected with power Vcc.The output of this optocoupler U1 connects a resistance R 7, and the other end of this resistance R 7 is connected with power Vcc.
The power input voltage excess voltage protection that is used for the single-phase inversion electric welding machine that the technical program provides can protect electric welding machine can not damage under overpressure situation.This excess voltage protection has utilized the soft start relay of electric welding machine itself, increases subelement in the importation, the input voltage of the power end of restriction electric welding machine.This excess voltage protection simple in structure, cost is low, and reliability is high, and is respond well through practical proof.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to illustrate technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. power input voltage excess voltage protection that is used for the single-phase inversion electric welding machine; it is characterized in that; described power input voltage excess voltage protection comprises a controllable silicon; described power input voltage is connected with described controllable silicon after through a rectifier and a filter capacitor; when described power input voltage is less than or equal to a set point; described controllable silicon triggering and conducting, when described power input voltage is higher than described set point, described controllable silicon cut-off.
2. power input voltage excess voltage protection as claimed in claim 1 is characterized in that, described controllable silicon is connected with a thermistor RT1 and a capacitor C 2, and during described controllable silicon triggering and conducting, described thermistor RT1 is described capacitor C 2 chargings.
3. power input voltage excess voltage protection as claimed in claim 2 is characterized in that, described controllable silicon and described thermistor RT1 are in parallel with a relay, described controllable silicon cut-off when described relay disconnects.
4. power input voltage excess voltage protection as claimed in claim 3; it is characterized in that; described power input voltage excess voltage protection also comprises a triode Q1; one optocoupler U1; one capacitor C 3; one triode Q2; the collector electrode of described triode Q1 is connected with the input of optocoupler U1; the output of described optocoupler U1 is in parallel with capacitor C 3; described capacitor C 3 one end ground connection; the other end is connected with the base stage of described triode Q2; the collector electrode of described triode Q2 is connected with described relay; when described power input voltage is higher than described set point; described triode Q1 conducting; described optocoupler U1 starts working; the lower voltage of described capacitor C 3, described triode Q2 cut-off, described relay disconnects.
5. power input voltage excess voltage protection as claimed in claim 4; it is characterized in that; the base stage of described triode Q1 is connected with divider resistance R1, R2; the emitter of described triode Q1 is connected with a voltage-stabiliser tube Z1; when described power input voltage is higher than described set point; when described power input voltage passes through divider resistance R1, R2 and punctures voltage-stabiliser tube Z1, cause described triode Q1 conducting.
6. power input voltage excess voltage protection as claimed in claim 2; it is characterized in that; described silicon controlled anode is connected with a resistance R 4; described silicon controlled negative electrode is connected with a diode D2 with controlled stage; described silicon controlled controlled stage also is connected with a resistance R 8, and described capacitor C 2 is in parallel with a resistance R 5.
7. power input voltage excess voltage protection as claimed in claim 3 is characterized in that, the collector electrode of described triode Q1 is connected with the input of described optocoupler U1 by a piezo-resistance.
8. power input voltage excess voltage protection as claimed in claim 4; it is characterized in that; described capacitor C 3 is connected with the base stage of described triode Q2 by a voltage-stabiliser tube Z2, and described relay is in parallel with a diode D3, and an end of relay is connected with power Vcc.
9. power input voltage excess voltage protection as claimed in claim 4 is characterized in that, the output of described optocoupler U1 connects a resistance R 7, and the other end of described resistance R 7 is connected with power Vcc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220560523 CN202872328U (en) | 2012-10-30 | 2012-10-30 | Power supply input voltage overvoltage protection circuit used for single-phase inverter type welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220560523 CN202872328U (en) | 2012-10-30 | 2012-10-30 | Power supply input voltage overvoltage protection circuit used for single-phase inverter type welder |
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| Publication Number | Publication Date |
|---|---|
| CN202872328U true CN202872328U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220560523 Expired - Fee Related CN202872328U (en) | 2012-10-30 | 2012-10-30 | Power supply input voltage overvoltage protection circuit used for single-phase inverter type welder |
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| CN (1) | CN202872328U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401410A (en) * | 2013-06-24 | 2013-11-20 | 华为技术有限公司 | Power supply combining slow-start circuit, router and double-input-end equipment |
| CN108110729A (en) * | 2017-12-19 | 2018-06-01 | 浙江劳士顿焊接设备有限公司 | A kind of high-low pressure for electric welding machine protects detection circuit |
| CN110635457A (en) * | 2019-11-12 | 2019-12-31 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
-
2012
- 2012-10-30 CN CN 201220560523 patent/CN202872328U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401410A (en) * | 2013-06-24 | 2013-11-20 | 华为技术有限公司 | Power supply combining slow-start circuit, router and double-input-end equipment |
| CN108110729A (en) * | 2017-12-19 | 2018-06-01 | 浙江劳士顿焊接设备有限公司 | A kind of high-low pressure for electric welding machine protects detection circuit |
| CN110635457A (en) * | 2019-11-12 | 2019-12-31 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
| CN110635457B (en) * | 2019-11-12 | 2022-03-29 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Power supply input voltage overvoltage protection circuit used for single-phase inverter type welder Effective date of registration: 20131211 Granted publication date: 20130410 Pledgee: Bank of Shanghai Limited by Share Ltd Pudong branch Pledgor: Shanghai Weiteli Welding Equipment Manufacturing Co., Ltd. Registration number: 2013310000084 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20171201 Granted publication date: 20130410 Pledgee: Bank of Shanghai Limited by Share Ltd Pudong branch Pledgor: Shanghai Weiteli Welding Equipment Manufacturing Co., Ltd. Registration number: 2013310000084 |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20171229 Address after: Shen Mei Road Pudong District Shanghai 201318 Lane 99, No. 3 A District 2 floor Patentee after: SHANGHAI HEZONG WELDING EQUIPMENT MANUFACTURING CO., LTD. Address before: 201204 Shanghai City, Pudong New Area Lianlinlu No. 33 Patentee before: Shanghai Weiteli Welding Equipment Manufacturing Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20201030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |