CN101738531A - Method for detecting output current of inverting welding machine - Google Patents
Method for detecting output current of inverting welding machine Download PDFInfo
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- CN101738531A CN101738531A CN200910216856A CN200910216856A CN101738531A CN 101738531 A CN101738531 A CN 101738531A CN 200910216856 A CN200910216856 A CN 200910216856A CN 200910216856 A CN200910216856 A CN 200910216856A CN 101738531 A CN101738531 A CN 101738531A
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Abstract
The invention relates to a method for detecting the output current of an inverting welding machine, which mainly comprises the current sampling step and the single processing step. A current transformer L1 is arranged in the primary or secondary grade of a main transformer, a bridge-type rectifying circuit which is formed by a diode D1, a diode D2, a diode D3 and a diode D4 is used for rectifying the current sampled by the current transformer L1, a resistor R1 is used for sampling, and a resistor R2 and a resistor R3 are used for dividing the voltage. The in-phase input end of a voltage comparator U1A is connected with the resistor R3, and the inverted-phase input end is connected with an output resistor R6. When the voltage of the resistor R3 is higher than the voltage of the output resistor R6, the output end of the voltage comparator U1A is in the low level to energize a P-type or N-type switching pipe Q1 to enable a voltage source VCC to charge a filter capacitor C1. When the voltage of the resistor R3 is lower than the voltage of the output resistor R6, the output end of the voltage comparator U1A is in the high level to deenergize the P-type or N-type switching pipe Q1 to enable a voltage source VCC to stop charging the filter capacitor C1 so that the voltage of the output resistor R6 is kept to be the peak voltage of the resistor R3. Because the peak voltage of the resistor R3 is in direct proportion to the output current of the inverting welding machine, the voltage of the output resistor R6 is in direct proportion to the output current of the inverting welding machine. The method for detecting the output current of the inverting welding machine is characterized in that the current is sampled in the primary or secondary grade of the main transformer rather than on the output end of the main transformer.
Description
Affiliated technical field:
What the present invention relates to is the detection method of a kind of electric welding machine, especially output current of inverting welding machine.
Background technology:
Inversion welding machine needs to detect in real time the electric welding machine output current for welding current is accurately controlled, and adopts devices such as Hall current sensor or shunt to detect the electric welding machine output current at the output terminal of welding machine at present.The advantage of Hall current sensor is to realize testing circuit and main circuit isolation, but the cost height of Hall current sensor, especially big current Hall sensor; And Hall current sensor needs power supply power supply, testing circuit complexity.Adopt the scheme cost of shunt low, but can not realize testing circuit and main circuit isolation, poor anti jamming capability.This is the weak point that present method for detecting output current of inverting welding machine exists.
Summary of the invention:
The objective of the invention is deficiency, a kind of isolated form method for detecting output current of inverting welding machine cheaply is provided at the prior art existence.This method adopts current transformer with low cost to realize the isolation sampling of testing circuit and main circuit, detects the output current of welding machine again by signal processing circuit.
This method realizes by following circuit, mainly comprises current sample link and signal Processing link.Current transformer L1, commutation diode D1, D2, D3 and D4, sampling resistor R1 forms the current sample link, divider resistance R2, R3, voltage comparator U1 and pull-up resistor R7, switching tube Q1 and driving resistor R4 thereof, current-limiting resistance R5, output resistance R6 and filter capacitor C1 form the signal Processing link.It is characterized in that the current sample link on main circuit transformer elementary or secondary, rather than on the output terminal of electric welding machine.
This method utilizes current transformer L1 to place main-transformer elementary (or secondary), detect elementary (or secondary) electric current of transformer, the bridge rectifier circuit of forming by commutation diode D1, D2, D3 and D4 carries out rectification to the electric current that L1 samples, carry out dividing potential drop by resistance R 2 and R3 after resistance R 1 is sampled, then the magnitude of voltage of R3 is proportional to the electric current of main-transformer elementary (or secondary).The in-phase input end of voltage comparator U1A (4 pin) meets R3, and end of oppisite phase input end (5 pin) meets output resistance R6.When the voltage of R3 was higher than the voltage of resistance R 6, low level will appear in the output terminal of voltage comparator U1A (2 pin) made the Q1 conducting, thereby voltage source V CC charges to filter capacitor C1 by R5, Q1.When the voltage of R3 is lower than the voltage of resistance R 6, the output terminal of voltage comparator U1A (2 pin) will occur high level make Q1 by, end voltage source VCC is to the charging of C1, thereby the voltage that makes R6 (or C1) can remain on the crest voltage of R3, because the crest voltage of R3 is proportional to the output current of electric welding machine, so the voltage of R6 (or C1) is proportional to the output current of electric welding machine.
Description of drawings:
Fig. 1 is the synoptic diagram of the specific embodiment of the invention.
Fig. 2 is a kind of deformation type circuit diagram of current sample link of the present invention.
Fig. 3 is a kind of deformation type circuit diagram of signal Processing link of the present invention.
Embodiment:
1 explanation circuit of the present invention is formed with reference to the accompanying drawings.Current transformer L1 places elementary (or secondary) of main-transformer, detect elementary (or secondary) electric current of transformer, the bridge rectifier circuit of forming by commutation diode D1, D2, D3 and D4 carries out rectification to the electric current that L1 samples, carry out dividing potential drop by resistance R 2 and R3 after resistance R 1 is sampled, then the magnitude of voltage of R3 is proportional to the elementary electric current of main-transformer.The in-phase input end of voltage comparator U1A (4 pin) meets R3, and end of oppisite phase input end (5 pin) meets output resistance R6.When the voltage of R3 was higher than the voltage of resistance R 6, low level will appear in the output terminal of voltage comparator U1A (2 pin) made the Q1 conducting, thereby voltage source V CC charges to filter capacitor C1 by R5, Q1.When the voltage of R3 is lower than the voltage of resistance R 6, the output terminal of voltage comparator U1A (2 pin) will occur high level make Q1 by, end voltage source VCC is to the charging of C1, thereby the voltage that makes R6 (or C1) can remain on the crest voltage of R3, because the crest voltage of R3 is proportional to the output current of electric welding machine, therefore the voltage of R6 (or C1) is proportional to the output current of electric welding machine, thereby has realized the detection of butt welding machine output current.
Figure 2 shows that primary (or secondary) current sampling circuit that adopts full-wave rectification, this circuit can replace the circuit in Fig. 1 frame of broken lines.Current transformer L2 places elementary (or secondary) of main-transformer, carries out full-wave rectification after resistance R 1 is sampled by commutation diode D5, D6.
Figure 3 shows that a kind of deformation type circuit of signal Processing link of the present invention, be of in-phase end (4 pin) input of the voltage of R3 with the difference of Fig. 1 from comparer U1A, the voltage of R6 is from end of oppisite phase (5 pin) input of comparer U1A, and employing N type switching tube Q2 is to capacitor C 1 charging.Because the roll over condition of the output terminal (2 pin) of U1A is opposite with Fig. 1, and among the condition of opening of Q2 and Fig. 1 Q1 to open condition also opposite, thereby the voltage of R6 (or C1) still can remain on the crest voltage of R3, realizes the signal processing function identical with Fig. 1.
Claims (4)
1. method for detecting output current of inverting welding machine, this method mainly comprises current sample link and signal Processing link, utilize current transformer L1 to place main-transformer elementary (or secondary), detect elementary (or secondary) electric current of transformer, the bridge rectifier circuit of forming by commutation diode D1, D2, D3 and D4 carries out rectification to the electric current that L1 samples, carry out dividing potential drop by resistance R 2 and R3 after resistance R 1 is sampled, then the magnitude of voltage of R3 is proportional to the electric current of main-transformer elementary (or secondary); The in-phase input end of voltage comparator U1A (4 pin) meets R3, and end of oppisite phase input end (5 pin) meets output resistance R6; When the voltage of R3 was higher than the voltage of resistance R 6, low level will appear in the output terminal of voltage comparator U1A (2 pin) made the Q1 conducting, thereby voltage source V CC charges to filter capacitor C1 by R5, Q1; When the voltage of R3 is lower than the voltage of resistance R 6, the output terminal of voltage comparator U1A (2 pin) will occur high level make Q1 by, end voltage source VCC is to the charging of C1, thereby the voltage that makes R6 (or C1) can remain on the crest voltage of R3, because the crest voltage of R3 is proportional to the output current of electric welding machine, so the voltage of R6 (or C1) is proportional to the output current of electric welding machine.
2. detection method according to claim 1 is the elementary or secondary current sample that carries out at the main circuit transformer, rather than samples at the output terminal of electric welding machine.
3. be a current transformer according to the described L1 of claim 1, can place power transformer elementary or secondary, it is formed primary or secondary current sample with commutation diode D1, D2, D3 and D4 and sampling resistor R1.
4. current sample link according to claim 1 can adopt the mode of full-wave rectification to carry out current sample.5. be P type switching tube or N type switching tube according to the described Q1 of claim 1, when adopting N type switching tube two input ends of voltage comparator U1A can be exchanged and get final product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910216856A CN101738531B (en) | 2009-12-31 | 2009-12-31 | Method for detecting output current of inverting welding machine |
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| CN200910216856A CN101738531B (en) | 2009-12-31 | 2009-12-31 | Method for detecting output current of inverting welding machine |
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| CN101738531A true CN101738531A (en) | 2010-06-16 |
| CN101738531B CN101738531B (en) | 2012-09-05 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457187A (en) * | 2010-10-26 | 2012-05-16 | 台达电子工业股份有限公司 | Electric current detection device and method thereof as well as electric current detection signal comparing unit and method thereof |
| CN102636676A (en) * | 2011-02-12 | 2012-08-15 | 中兴通讯股份有限公司 | Bridge-type current detecting circuit |
| CN102981042A (en) * | 2012-12-07 | 2013-03-20 | 深圳市安邦信电子有限公司 | Three-phase current detection circuit for frequency converter |
| CN103616548A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit and detecting method based on direct current signals |
| CN104062639A (en) * | 2014-07-07 | 2014-09-24 | 中国船舶重工集团公司第七二四研究所 | T/R module transmitting state current sampling and monitoring circuit |
| CN110456232A (en) * | 2019-09-02 | 2019-11-15 | 北京智芯微电子科技有限公司 | The low-power current detection circuit of the independent powering mode of fault detector battery |
| CN111879994A (en) * | 2020-08-24 | 2020-11-03 | 长沙智汇芯智能科技有限公司 | Bidirectional current detection circuit and detection method thereof |
| CN113848399A (en) * | 2020-06-28 | 2021-12-28 | 广东威特真空电子制造有限公司 | Microwave oven and magnetron detection device |
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| CN2781388Y (en) * | 2005-03-13 | 2006-05-17 | 吴云龙 | Welding current detecting device of electronic mash welder |
| CN2829964Y (en) * | 2005-03-20 | 2006-10-25 | 吴云龙 | Welding current detector of electronic mash welder |
| CN200996974Y (en) * | 2007-01-17 | 2007-12-26 | 梁柏青 | Welding current and voltage inspecter for electronic spot welder |
| CN201220316Y (en) * | 2008-01-10 | 2009-04-15 | 杭州凯尔达电焊机有限公司 | Protective circuit of contravariant welding machine |
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2009
- 2009-12-31 CN CN200910216856A patent/CN101738531B/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457187A (en) * | 2010-10-26 | 2012-05-16 | 台达电子工业股份有限公司 | Electric current detection device and method thereof as well as electric current detection signal comparing unit and method thereof |
| CN102457187B (en) * | 2010-10-26 | 2015-04-15 | 台达电子工业股份有限公司 | Electric current detection device and method thereof as well as electric current detection signal comparing unit and method thereof |
| CN102636676A (en) * | 2011-02-12 | 2012-08-15 | 中兴通讯股份有限公司 | Bridge-type current detecting circuit |
| CN102636676B (en) * | 2011-02-12 | 2014-09-10 | 中兴通讯股份有限公司 | Bridge-type current detecting circuit |
| CN102981042A (en) * | 2012-12-07 | 2013-03-20 | 深圳市安邦信电子有限公司 | Three-phase current detection circuit for frequency converter |
| CN103616548A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit and detecting method based on direct current signals |
| CN103616548B (en) * | 2013-11-26 | 2015-12-30 | 上海通用重工集团有限公司 | A kind of output current of inverting welding machine testing circuit based on direct current signal and detection method |
| CN104062639A (en) * | 2014-07-07 | 2014-09-24 | 中国船舶重工集团公司第七二四研究所 | T/R module transmitting state current sampling and monitoring circuit |
| CN110456232A (en) * | 2019-09-02 | 2019-11-15 | 北京智芯微电子科技有限公司 | The low-power current detection circuit of the independent powering mode of fault detector battery |
| CN110456232B (en) * | 2019-09-02 | 2021-07-27 | 北京智芯微电子科技有限公司 | Low-power-consumption current detection circuit of fault indicator battery independent power supply mode |
| CN113848399A (en) * | 2020-06-28 | 2021-12-28 | 广东威特真空电子制造有限公司 | Microwave oven and magnetron detection device |
| CN111879994A (en) * | 2020-08-24 | 2020-11-03 | 长沙智汇芯智能科技有限公司 | Bidirectional current detection circuit and detection method thereof |
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|---|---|
| CN101738531B (en) | 2012-09-05 |
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