CN201773133U - Output current detection device of inverter welder - Google Patents
Output current detection device of inverter welder Download PDFInfo
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- CN201773133U CN201773133U CN2009203514622U CN200920351462U CN201773133U CN 201773133 U CN201773133 U CN 201773133U CN 2009203514622 U CN2009203514622 U CN 2009203514622U CN 200920351462 U CN200920351462 U CN 200920351462U CN 201773133 U CN201773133 U CN 201773133U
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Abstract
An output current detection device of an inverter welder comprises a current sampling link and a signal processing link, and is characterized in that a current transformer L1 is put on the primary winding or secondary winding of a main transformer, the signal sampled by the L1 is rectified by a bridge rectifier circuit formed by diodes D1 to D4, sampled by a resistor R1 and voltage-divided by resistors R2 and R3. The same-phase input end of a voltage comparator U1A is connected with the R3, and the reverse-phase input end is connected with an input resistor R6. When the voltage value of the R3 is larger than that of the resistor R6, the output end of the voltage comparator U1A is in a low-level state to communicate a Q1, thus leading a voltage source VCC to charge a capacitor C1 by the R5 and the Q1. When the voltage value of the R3 is lower than that of the resistor R6, the input end of the voltage comparator U1A is in a high-level state to stop the Q1 and stop the voltage source VCC from charging the C1, therefore, the voltage of the R6 is kept at the peak value voltage of the R3, the peak value voltage of the R3 is proportional to the output current of the welder, so that the voltage is proportional to the output current of the welder. The output current detection device has the characteristic of carrying out current sampling at the primary or secondary winding instead of the output end.
Description
Technical field:
What the present invention relates to is the pick-up unit 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 output current of inverting welding machine detection mode exists.
Summary of the invention:
The objective of the invention is deficiency, a kind of isolated form output current of inverting welding machine pick-up unit cheaply is provided at the prior art existence.This device 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 device is realized by following circuit, mainly comprises sampling element 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 device utilizes current transformer L1 to place the elementary or secondary of main-transformer, detect the elementary or secondary 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 or secondary 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, 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 the primary or the secondary current sample circuit that adopt full-wave rectification, this circuit can replace the circuit in Fig. 1 frame of broken lines.Current transformer L2 places the 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 (2)
1. output current of inverting welding machine pick-up unit, this device comprises sampling element and signal Processing link, it is characterized in that sampling element is made up of current transformer, rectification diode and resistance, at the elementary or secondary current sample that carries out of main circuit transformer; The signal Processing link is made of switching tube, voltage comparator, resistance and electric capacity.
2. a kind of output current of inverting welding machine pick-up unit according to claim 1 is characterized in that sampling element can adopt the full-bridge rectification mode also can adopt the mode of full-wave rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203514622U CN201773133U (en) | 2009-12-31 | 2009-12-31 | Output current detection device of inverter welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203514622U CN201773133U (en) | 2009-12-31 | 2009-12-31 | Output current detection device of inverter welder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201773133U true CN201773133U (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203514622U Expired - Lifetime CN201773133U (en) | 2009-12-31 | 2009-12-31 | Output current detection device of inverter welder |
Country Status (1)
| Country | Link |
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| CN (1) | CN201773133U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103612039A (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 based on AC signal and detecting method |
| 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 |
| CN110389248A (en) * | 2018-04-16 | 2019-10-29 | 广东美的生活电器制造有限公司 | A kind of ac voltage detection circuit, equipment, method and storage medium |
-
2009
- 2009-12-31 CN CN2009203514622U patent/CN201773133U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103612039A (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 based on AC signal and detecting method |
| 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 |
| CN103612039B (en) * | 2013-11-26 | 2017-01-11 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit based on AC signal and detecting method |
| CN110389248A (en) * | 2018-04-16 | 2019-10-29 | 广东美的生活电器制造有限公司 | A kind of ac voltage detection circuit, equipment, method and storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110323 |