CN201231370Y - Input terminal power-supply protection device of electric welding device - Google Patents
Input terminal power-supply protection device of electric welding device Download PDFInfo
- Publication number
- CN201231370Y CN201231370Y CNU2008200230431U CN200820023043U CN201231370Y CN 201231370 Y CN201231370 Y CN 201231370Y CN U2008200230431 U CNU2008200230431 U CN U2008200230431U CN 200820023043 U CN200820023043 U CN 200820023043U CN 201231370 Y CN201231370 Y CN 201231370Y
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- welding machine
- optocoupler
- input
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- resistance
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Abstract
The utility model discloses power supply protection equipment of a welding machine input end, which adopts a protection circuit composed of a voltage dependent resistor, a leakage circuit-breaker, an optical coupler and a resistor. When a welding machine is supplied with overvoltage because of the some reasons, the utility model ensures that the optical coupler is conducted after the voltage dependent resistor acts to produce leakage current leading the leakage circuit-breaker to act, the power supply is immediately cut off so as to cause the welding machine to be effectively protected, the utility model fills the gap that the welding machine is protected by adopting the voltage dependent resistor only, causes the welding machine to be more reliable, and lowers the failure ratio.
Description
Technical field
The utility model relates to the power supply protection circuit of the electric welding machine (it is extremely unstable particularly to be applied to mains supply) that is used to weld, relate in particular to a kind of protective equipment for supplying power for input end of electric welding machine.
Background technology
In the prior art, most of welding machines generally adopt input piezo-resistance in parallel that electric welding machine is carried out overvoltage protection.Piezo-resistance is the protecting component with transient voltage inhibit feature; can prevent because of static; surge and other transient current and the device failure that causes; though piezo-resistance can absorb very big electric flux; but it can't bear milliampere above follow current of level; can only protect the moment overvoltage of burst pulse; the welding machine of single employing piezo-resistance can't adapt to the situation that supply voltage causes broad pulse or sustained overvoltage for various reasons at all; not only can cause the permanent damages of piezo-resistance own in this case and be easy to cause the welding machine internal components to damage; cause welder fault, this is the deficiencies in the prior art parts.
The utility model content
The purpose of this utility model is exactly at the existing in prior technology deficiency, and provide a kind of electric welding machine adapt to overvoltage power supply occasion protective equipment for supplying power for input end of electric welding machine.This scheme employing piezo-resistance cooperation RCCB and optocoupler, resistance are formed holding circuit; when welding machine causes under the power supply overpressure situation for a certain reason; can guarantee that piezo-resistance action back in time cuts off power supply, thereby protect piezo-resistance and welding machine internal components not fragile.
For achieving the above object, the utility model adopts following technical scheme:
A kind of protective equipment for supplying power for input end of electric welding machine, it comprises power supply and welding machine major loop, described power supply is connected with the earth leakage protective device input, and the earth leakage protective device output is connected with rectification circuit D1 input, and the both positive and negative polarity output of rectification circuit D1 is connected with the welding machine major loop; An output of earth leakage protective device is connected with optocoupler U1 secondary one end simultaneously, and the secondary other end is connected with one of all the other phase lines of earth leakage protective device input by the resistance R 1 of series connection; The cathode output end of rectification circuit D1 is connected with the former limit of optocoupler U1 one end with resistance R 3 backs by the piezoresistance R4 of series connection simultaneously, and the former limit of the optocoupler U1 other end is connected with the cathode output end of rectification circuit D1.
Described earth leakage protective device is RCCB RCD, and each phase line of its input is provided with K switch 1, and each phase line of output is provided with anti-common mode inductance L1.
Series resistor R2, capacitor C 1 between described optocoupler U1 secondary two inputs are provided with resistance R 1 between capacitor C 1 and earth leakage protective device input simultaneously.
Described power supply is three-phase four-wire system or three-phase three-wire system or single-phase 220V; Wherein, during single-phase 220V, optocoupler U1 secondary one termination RCCB voltage input phase, the other end of optocoupler U1 secondary is through resistance R 1 earth connection.
Described photoelectrical coupler U1 can also be relay or solid-state relay or the control device that isolation features is arranged.
One of output phase line of RCCB is connected (being connected with the zero line of the input of RCCB during single-phase 220V) by resistance of polyphone through one of other two phase lines of the secondary of optocoupler and the input of RCCB in the utility model; Alternating current links to each other with negative pole after the rectification with the former limit of a metalfilmresistor through optocoupler through piezo-resistance of output cathode series connection behind the over commutation.Cause piezo-resistance when action when overvoltage appears in the welding machine supply voltage, the control end of optocoupler has had the control electric current and conducting, and secondary is open-minded simultaneously, and two phase voltages produce leakage current on resistance, makes the RCCB action and cuts off the electricity supply.The characteristics of this programme are to have increased RCCB and optocoupler on the original holding circuit of welding machine basis; piezo-resistance action drives optocoupler is in time opened and is made the enough big leakage current of optical coupling secondary edges generation impel the RCCB action when surpassing a certain set point value by the DC voltage in each parameter assurance circuit of choose reasonable, finally reaches the purpose of protection electric welding machine.
The beneficial effect of this programme can be learnt according to the narration to such scheme; owing to adopted earth leakage protective device; by detecting input voltage; when input voltage is higher than a certain value, can impel optocoupler to open the leakage current that produces the earth leakage protective device action, the assurance welding machine can in time be cut off the electricity supply; piezo-resistance and welding machine are effectively protected; remedy the defective that only single employing piezo-resistance is protected, made welding machine more reliable, reduced fault rate.This shows that the utility model has outstanding substantive distinguishing features and obvious improvement compared with prior art, its essence effect also is conspicuous.
Description of drawings
Circuit theory diagrams when Fig. 1 is three-phase four-wire system;
Circuit theory diagrams when Fig. 2 is three-phase three-wire system;
Circuit theory diagrams when Fig. 3 is single-phase 220V.
Concrete embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Embodiment 1:
Among Fig. 1, power supply is a three-phase four-wire system, power supply each phase L1, L2, L3 and N pass through K switch 1 and are connected to RCCB RCD, one of the output phase line of RCCB RCD L3 connects No. 4 pin of secondary of optocoupler U1, No. 3 pin connecting resistances of the secondary R1 of U1, one of input phase line of another termination RCCB of R1 RCD L2; No. 4 pin connecting resistance R2 of optocoupler U1 secondary, another termination capacitor C 4 of R2, the C4 other end connects No. 3 pin of U1 secondary again; Each alternating current of exporting mutually of RCCB RCD output enters rectification circuit D1 rectification, the D1 output cathode connects piezo-resistance R4 one end, piezo-resistance R4 other end connecting resistance R3, the R3 other end connect No. 1 pin on the former limit of optocoupler U1 again, and No. 2 pin on the former limit of U1 connect the output negative pole of rectification circuit D1.The characteristics of this programme are to have increased earth leakage protective device RCD and optocoupler U1 on the original holding circuit of welding machine basis; guaranteeing by each component parameters of choose reasonable that DC voltage optocoupler U1 when surpassing a certain value in circuit can in time open makes secondary produce enough big leakage current to impel earth leakage protective device to move, finally reach the purpose of protecting electric welding machine.
Embodiment 2:
Among Fig. 2, power supply is a three-phase three-wire system, power supply each phase L1, L2, L3 pass through K switch 1 and are connected to RCCB RCD, one of the output phase line of RCCB RCD L3 connects No. 4 pin of secondary of optocoupler U1, No. 3 pin connecting resistances of the secondary R1 of U1, one of input phase line of another termination RCCB of R1 RCD L2; No. 4 pin connecting resistance R2 of optocoupler U1 secondary, another termination capacitor C 4 of R2, the C4 other end connects No. 3 pin of U1 secondary again; Each alternating current of exporting mutually of RCCB RCD output enters rectification circuit D1 rectification, the D1 output cathode connects piezo-resistance R4 one end, piezo-resistance R4 other end connecting resistance R3, the R3 other end connect No. 1 pin on the former limit of optocoupler U1 again, and No. 2 pin on the former limit of U1 connect the output negative pole of rectification circuit D1.The characteristics of this programme are to have increased earth leakage protective device RCD and optocoupler U1 on the original holding circuit of welding machine basis; guaranteeing by each component parameters of choose reasonable that DC voltage optocoupler U1 when surpassing a certain value in circuit can in time open makes secondary produce enough big leakage current to impel earth leakage protective device to move, finally reach the purpose of protecting electric welding machine.
Embodiment 3:
Among Fig. 3, power supply is single-phase 220V, and its L end is connected with RCCB RCD input by K switch 1, and the N end directly is connected with RCCB RCD input.The output L of RCCB RCD connects No. 4 pin of optocoupler U1 secondary, No. 3 pin connecting resistance R1 of U1 secondary, the input zero line N of another termination RCCB of R1 RCD; No. 4 pin connecting resistance R2 of optocoupler U1 secondary, another termination capacitor C 4 of R2, the C4 other end connects No. 3 pin of U1 secondary again; The alternating current of RCCB RCD output L output enters rectification circuit D1 rectification, output cathode connects piezo-resistance R4 one end, piezo-resistance R4 other end connecting resistance R3, the R3 other end connect No. 1 pin on the former limit of optocoupler U1 again, and No. 2 pin on the former limit of U1 connect the output negative pole of rectification circuit D1.The characteristics of this programme are to have increased earth leakage protective device RCD and optocoupler U1 on the original holding circuit of welding machine basis; guaranteeing by each component parameters of choose reasonable that DC voltage optocoupler U1 when surpassing a certain value in circuit can in time open makes secondary produce enough big leakage current to impel earth leakage protective device to move, finally reach the purpose of protecting electric welding machine.
Claims (5)
1. protective equipment for supplying power for input end of electric welding machine, it comprises power supply and welding machine major loop, it is characterized in that, described power supply is connected with the earth leakage protective device input, the earth leakage protective device output is connected with rectification circuit D1 input, and the both positive and negative polarity output of rectification circuit D1 is connected with the welding machine major loop; An output of earth leakage protective device is connected with optocoupler U1 secondary one end simultaneously, and the secondary other end is connected with one of all the other phase lines of earth leakage protective device input by the resistance R 1 of series connection; The cathode output end of rectification circuit D1 is connected with the former limit of optocoupler U1 one end with resistance R 3 backs by the piezoresistance R4 of series connection simultaneously, and the former limit of the optocoupler U1 other end is connected with the cathode output end of rectification circuit D1.
2. protective equipment for supplying power for input end of electric welding machine as claimed in claim 1 is characterized in that, described earth leakage protective device is RCCB RCD, and each phase line of its input is provided with K switch 1, and each phase line of output is provided with anti-common mode inductance L1.
3. protective equipment for supplying power for input end of electric welding machine as claimed in claim 1 is characterized in that, series resistor R2, capacitor C 1 between described optocoupler U1 secondary two inputs are provided with resistance R 1 between capacitor C 1 and earth leakage protective device input simultaneously.
4. protective equipment for supplying power for input end of electric welding machine as claimed in claim 1 is characterized in that, described power supply is three-phase four-wire system or three-phase three-wire system or single-phase 220V; Wherein, during single-phase 220V, optocoupler U1 secondary one termination RCCB voltage input phase, the other end of optocoupler U1 secondary is through resistance R 1 earth connection.
5. protective equipment for supplying power for input end of electric welding machine as claimed in claim 1 is characterized in that, described photoelectrical coupler U1 can also be relay or solid-state relay or the control device that isolation features is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200230431U CN201231370Y (en) | 2008-05-29 | 2008-05-29 | Input terminal power-supply protection device of electric welding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200230431U CN201231370Y (en) | 2008-05-29 | 2008-05-29 | Input terminal power-supply protection device of electric welding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201231370Y true CN201231370Y (en) | 2009-05-06 |
Family
ID=40617745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200230431U Expired - Lifetime CN201231370Y (en) | 2008-05-29 | 2008-05-29 | Input terminal power-supply protection device of electric welding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201231370Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282034B (en) * | 2008-05-29 | 2010-09-15 | 山东山大奥太电气有限公司 | Protective equipment for supplying power for input end of electric welding machine |
| WO2011100348A1 (en) * | 2010-02-15 | 2011-08-18 | Illinois Tool Works Inc. | Welding power source with circuit breaker and controller; method of controlling such welding power source; control circuit for a welding power source with locl out operation of the power source |
-
2008
- 2008-05-29 CN CNU2008200230431U patent/CN201231370Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282034B (en) * | 2008-05-29 | 2010-09-15 | 山东山大奥太电气有限公司 | Protective equipment for supplying power for input end of electric welding machine |
| WO2011100348A1 (en) * | 2010-02-15 | 2011-08-18 | Illinois Tool Works Inc. | Welding power source with circuit breaker and controller; method of controlling such welding power source; control circuit for a welding power source with locl out operation of the power source |
| US8796585B2 (en) | 2010-02-15 | 2014-08-05 | Illinois Tool Works Inc. | Methods and devices for responding to high primary supply voltages of welding systems |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090506 Effective date of abandoning: 20080529 |