CN101282034A - Protective equipment for supplying power for input end of electric welding machine - Google Patents
Protective equipment for supplying power for input end of electric welding machine Download PDFInfo
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- CN101282034A CN101282034A CNA2008100164222A CN200810016422A CN101282034A CN 101282034 A CN101282034 A CN 101282034A CN A2008100164222 A CNA2008100164222 A CN A2008100164222A CN 200810016422 A CN200810016422 A CN 200810016422A CN 101282034 A CN101282034 A CN 101282034A
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- welding machine
- optocoupler
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Abstract
The invention discloses an electric welding machine input end power supply protection device which adopts a piezoresistor matching with a residual current circuit breaker and a protection circuit composed of an optical couple and a resistance, when the welding machine results in power supply overvaltage condition because of some reasons, after ensuring the piezoresistor to operate, the optical couple is opened to generate leakage current promoting the residual current circuit breaker to operate, the feeding power supply is cutted off in time to make the welding machine obetain effective protection and make up the defect using only one piezoresistor to protect, the welding machine is more reliable and reduces failure rate.
Description
Technical field
What the present invention relates to is the power supply protection circuit of the electric welding machine that is used to weld (it is extremely unstable particularly to be applied to mains supply), relates 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 protection 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 continuous 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 power 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.
Summary of the invention
Purpose of the present invention 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 residual current circuit breaker and optocoupler, resistance are formed protective 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 present invention 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 residual current circuit breaker 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 residual current circuit breaker 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 residual current circuit breaker is connected (being connected with the zero line of the input of residual current circuit breaker during single-phase 220V) by resistance of polyphone through one of other two phase lines of the secondary of optocoupler and the input of residual current circuit breaker among the present invention; 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 power voltage, the control end of optocoupler has had Control current and conducting, and secondary is open-minded simultaneously, and two phase voltages produce leakage current on resistance, makes the residual current circuit breaker action and cuts off the electricity supply.The characteristics of this programme are to have increased residual current circuit breaker and optocoupler on the original protective 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 residual current circuit breaker action when surpassing a certain set point value by the direct 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 failure rate.This shows that the present invention 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 execution mode
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
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 residual current circuit breaker RCD, one of the output phase line of residual current circuit breaker 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 residual current circuit breaker 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 residual current circuit breaker 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 protective circuit of welding machine basis; guaranteeing by each component parameters of choose reasonable that direct 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 residual current circuit breaker RCD, one of the output phase line of residual current circuit breaker 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 residual current circuit breaker 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 residual current circuit breaker 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 protective circuit of welding machine basis; guaranteeing by each component parameters of choose reasonable that direct 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 residual current circuit breaker RCD input by K switch 1, and the N end directly is connected with residual current circuit breaker RCD input.The output L of residual current circuit breaker 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 residual current circuit breaker 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 residual current circuit breaker 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 protective circuit of welding machine basis; guaranteeing by each component parameters of choose reasonable that direct 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 residual current circuit breaker 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 residual current circuit breaker 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 |
|---|---|---|---|
| CN2008100164222A CN101282034B (en) | 2008-05-29 | 2008-05-29 | Protective equipment for supplying power for input end of electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100164222A CN101282034B (en) | 2008-05-29 | 2008-05-29 | Protective equipment for supplying power for input end of electric welding machine |
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| Publication Number | Publication Date |
|---|---|
| CN101282034A true CN101282034A (en) | 2008-10-08 |
| CN101282034B CN101282034B (en) | 2010-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100164222A Active CN101282034B (en) | 2008-05-29 | 2008-05-29 | Protective equipment for supplying power for input end of electric welding machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001473A (en) * | 2012-12-19 | 2013-03-27 | 深圳市南岛机电有限公司 | Power adapter with residual current protection |
| CN103972856A (en) * | 2013-01-24 | 2014-08-06 | 昆达电脑科技(昆山)有限公司 | Electric vehicle power supply device and control method of electric vehicle power supply device |
| CN113257638A (en) * | 2021-06-23 | 2021-08-13 | 江苏能电科技有限公司 | Universal type plastic shell circuit breaker |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201231370Y (en) * | 2008-05-29 | 2009-05-06 | 山东山大奥太电气有限公司 | Input terminal power-supply protection device of electric welding device |
-
2008
- 2008-05-29 CN CN2008100164222A patent/CN101282034B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001473A (en) * | 2012-12-19 | 2013-03-27 | 深圳市南岛机电有限公司 | Power adapter with residual current protection |
| CN103972856A (en) * | 2013-01-24 | 2014-08-06 | 昆达电脑科技(昆山)有限公司 | Electric vehicle power supply device and control method of electric vehicle power supply device |
| CN103972856B (en) * | 2013-01-24 | 2017-05-10 | 昆达电脑科技(昆山)有限公司 | Electric vehicle power supply device and control method of electric vehicle power supply device |
| CN113257638A (en) * | 2021-06-23 | 2021-08-13 | 江苏能电科技有限公司 | Universal type plastic shell circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101282034B (en) | 2010-09-15 |
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Owner name: SHANDONG AOTAI ELECTRIC CO., LTD. Free format text: FORMER NAME: SHANDONG SHANDA AOTAI ELECTRIC CO., LTD. |
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Address after: 250100 No. 282 Bole Road, hi tech Development Zone, Shandong, Ji'nan Patentee after: Shandong Aotai Electric Co., Ltd. Address before: 250100 Shandong city of Ji'nan province Ying Xiu Lu Mountain high tech Zone Technology Park Hill electrical Austria too Patentee before: Shandong Sdu Aotai Electric Co., Ltd. |