CN101738531B - Method for detecting output current of inverting welding machine - Google Patents
Method for detecting output current of inverting welding machine Download PDFInfo
- Publication number
- CN101738531B CN101738531B CN200910216856A CN200910216856A CN101738531B CN 101738531 B CN101738531 B CN 101738531B CN 200910216856 A CN200910216856 A CN 200910216856A CN 200910216856 A CN200910216856 A CN 200910216856A CN 101738531 B CN101738531 B CN 101738531B
- Authority
- CN
- China
- Prior art keywords
- voltage
- current
- resistance
- welding machine
- transformer
- 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.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
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 of Hall current sensor is high, especially big current Hall sensor; And Hall current sensor needs the power supply power supply, the testing circuit complicacy.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 to 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 through signal processing circuit.
This method realizes through 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 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 through commutation diode D1, D2, D3 and D4 carries out rectification to the electric current that L1 samples; After resistance R 1 is sampled, carry out dividing potential drop by resistance R 2 with R3, 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 through 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 PV of R3, because the PV 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:
Form according to accompanying drawing 1 explanation circuit of the present invention.Current transformer L1 places elementary (or secondary) of main-transformer; Detect elementary (or secondary) electric current of transformer; The bridge rectifier circuit of forming through commutation diode D1, D2, D3 and D4 carries out rectification to the electric current that L1 samples; After resistance R 1 is sampled, carry out dividing potential drop by resistance R 2 with R3, 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 through 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 makes the voltage of R6 (or C1) can remain on the PV of R3, because the PV 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.
Shown in Figure 2 for adopting primary (or secondary) current sampling circuit of 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 through commutation diode D5, D6.
Shown in Figure 3 for 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 roll over condition and Fig. 1 of the output terminal (2 pin) of U1A are opposite, 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 PV of R3, realizes the signal processing function identical with Fig. 1.
Claims (5)
1. method for detecting output current of inverting welding machine; This method mainly comprises current sample link and signal Processing link; It is characterized in that: utilize current transformer L1 to place the elementary or secondary of main-transformer; Detect the elementary or secondary current of main-transformer; The bridge rectifier circuit of forming through commutation diode D1, D2, D3 and D4 carries out rectification to the electric current that current transformer L1 samples, and after resistance R 1 is sampled, carries out dividing potential drop by resistance R 2 and resistance R 3, and then the magnitude of voltage of resistance R 3 is proportional to the elementary or secondary electric current of main-transformer; The in-phase input end connecting resistance R6 of voltage comparator U1A, inverting input connecting resistance R3; When the voltage of resistance R 3 was higher than the voltage of resistance R 6, low level will appear in the output terminal of voltage comparator U1A made switching tube Q1 conducting, thereby voltage source V CC charges to filter capacitor C1 through resistance R 5, switching tube Q1; When the voltage of resistance R 3 is lower than the voltage of resistance R 6; The output terminal of voltage comparator U1A will occur high level make switching tube Q1 by; End voltage source VCC is to the charging of filter capacitor C1; Thereby the voltage that makes resistance R 6 or filter capacitor C1 can remain on the PV of resistance R 3, because the PV of resistance R 3 is proportional to the output current of inversion welding machine, so the voltage of resistance R 6 or filter capacitor C1 is proportional to the output current of inversion welding machine.
2. a kind of method for detecting output current of inverting welding machine according to claim 1 is characterized in that: at the elementary or secondary current sample that carries out of main-transformer, rather than sample at the output terminal of inversion welding machine.
3. according to claim 1 or the described a kind of method for detecting output current of inverting welding machine of claim 2, it is characterized in that: described current sample link adopts the mode of full-wave rectification to carry out current sample.
4. a kind of method for detecting output current of inverting welding machine according to claim 1; It is characterized in that: described current transformer L1 places main-transformer elementary or secondary, and it and commutation diode D1, D2, D3 and D4 and resistance R 1 are formed the current sample elementary or secondary to main-transformer.
5. a kind of method for detecting output current of inverting welding machine according to claim 1 is characterized in that: described switching tube Q1 is P type switching tube or N type switching tube.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101738531A CN101738531A (en) | 2010-06-16 |
| CN101738531B true CN101738531B (en) | 2012-09-05 |
Family
ID=42462264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910216856A Active CN101738531B (en) | 2009-12-31 | 2009-12-31 | Method for detecting output current of inverting welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101738531B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102636676B (en) * | 2011-02-12 | 2014-09-10 | 中兴通讯股份有限公司 | Bridge-type current detecting circuit |
| CN102981042B (en) * | 2012-12-07 | 2014-12-10 | 深圳市安邦信电子有限公司 | Three-phase current detection circuit for frequency converter |
| 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 |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2009
- 2009-12-31 CN CN200910216856A patent/CN101738531B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101738531A (en) | 2010-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101738531B (en) | Method for detecting output current of inverting welding machine | |
| CN103063979A (en) | Load open-circuit detection circuit | |
| CN104198794A (en) | Zero sequence current transformer wire-break detection and residual current detection circuit | |
| CN203884058U (en) | LED constant-current driving circuit capable of increasing demagnetizing detection precision | |
| CN102005795A (en) | Electric quantity detecting device for rechargeable battery | |
| CN106645893A (en) | Charge pump and voltage detection circuit thereof | |
| CN101609116B (en) | New method for detecting input phase failure | |
| CN104267273A (en) | Quick detection circuit and method for mains fluctuation | |
| CN101696996A (en) | Pulse width signal duty factor detector | |
| CN102998505B (en) | Battery undervoltage detection circuit | |
| CN203056577U (en) | Universal type switching value acquisition circuit | |
| CN103913626A (en) | Alternating current power down alarm circuit capable of avoiding direct current input false alarm | |
| CN201773133U (en) | Output current detection device of inverter welder | |
| CN103612039B (en) | Inverter welder output current detecting circuit based on AC signal and detecting method | |
| CN102967788B (en) | Line broken detection circuit of battery and detection method thereof | |
| CN204166058U (en) | A kind of city electro-mechanical wave quick detection circuit | |
| CN204347110U (en) | A kind of alternating current sample circuit | |
| CN203595790U (en) | Passive switch isolation detection apparatus | |
| CN204832315U (en) | Two -way current detection circuit | |
| CN211790729U (en) | High-low voltage protection circuit | |
| CN203929854U (en) | Voltage magnitude testing circuit | |
| CN202903862U (en) | Power supply voltage detection circuit for reclosing device | |
| CN104237616B (en) | Electric moter voltage current zero-crossing point detects circuit | |
| CN103292646B (en) | Method for detecting on-off state of bridge wire of electronic password detonator | |
| CN204374277U (en) | UPS charging current detecting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |