JPS55141389A - Electric current controlling device for resistance welding - Google Patents
Electric current controlling device for resistance weldingInfo
- Publication number
- JPS55141389A JPS55141389A JP4951779A JP4951779A JPS55141389A JP S55141389 A JPS55141389 A JP S55141389A JP 4951779 A JP4951779 A JP 4951779A JP 4951779 A JP4951779 A JP 4951779A JP S55141389 A JPS55141389 A JP S55141389A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- detected
- conduction
- angle
- 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.)
- Granted
Links
Landscapes
- Arc Welding Control (AREA)
Abstract
PURPOSE: To stabilize feedback control and realize welding of high quality easily, by converting the AC welding current into a DC feedback quantity small in ripple content, and operating the angle of conduction of three-terminal control element.
CONSTITUTION: A differential waveform of a welding current detected by a troidal coil 3 is detected as a voltage in a waveform restoring circuit A, and the output of the circuit A is delayed by about 1/6 cycle by means of circuits B1, B2. The AC voltage detected in the circuit A and the waveforms delayed in the circuits B1, B2 are respectively full-wave rectified in full wave rectifying circuits C1, C2, C3. These voltages are added in an adding circuit D, and the added voltage is converted into an effective value voltage having a small ripple content in an effective value converting circuit E. The difference between the output from a circuit F to apply a reference voltage to set the angle of conduction of a thyristor and the feedback quantity of the effective value voltage proportional to the welding current determined in the circuit E is detected in a circuit G and amplified. On the basis of the output voltage of the circuit G, the angle of conduction of thyristor L is set through a circuit H.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4951779A JPS55141389A (en) | 1979-04-20 | 1979-04-20 | Electric current controlling device for resistance welding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4951779A JPS55141389A (en) | 1979-04-20 | 1979-04-20 | Electric current controlling device for resistance welding |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55141389A true JPS55141389A (en) | 1980-11-05 |
JPS5722672B2 JPS5722672B2 (en) | 1982-05-14 |
Family
ID=12833325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4951779A Granted JPS55141389A (en) | 1979-04-20 | 1979-04-20 | Electric current controlling device for resistance welding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55141389A (en) |
-
1979
- 1979-04-20 JP JP4951779A patent/JPS55141389A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5722672B2 (en) | 1982-05-14 |
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