Apparatus for controlling inverter resistance welding

Details Apparatus for controlling inverter resistance welding Apparatus for controlling inverter resistance welding

1996-07-31

1998-05-05

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 17, 363134, 219110, B23K 910, H02M 3335, H02M 324, H02M 736

Patent

active

057484627

ABSTRACT:
An inverter resistance welding control or power supply apparatus includes a clock generator which generates a clock signal defining a switching cycle of an inverter in a resistance welding machine, a device for preselecting a predetermined reference value corresponding to a desired current peak, a current sensor for detecting primary or secondary current of the welding machine, and an inverter control for controlling the inverter on a switching cycle-by-cycle basis. Specifically, the apparatus turns on the inverter in response to a leading edge of the clock signal, and turns the inverter off either when the current detected signal has reached the reference value or when the clock signal has reached a trailing edge. The control apparatus further includes a magnitude evaluator for measuring a magnitude of the current from the detected signal, which magnitude is expressed in root mean square, arithmetic mean or averaged peak value. The control apparatus further includes a reporter monitor which reports, based on the measured results of the current, information useful to determine normal or defective operation. There may further be provided a lack-of-secondary current detector for operatively and reliably detecting a lack of secondary current by monitoring the primary current.

REFERENCES:
patent: 3916282 (1975-10-01), Rothermel
patent: 5229567 (1993-07-01), Kobayashi et al.
patent: 5349157 (1994-09-01), Blankenship
patent: 5351175 (1994-09-01), Blankenship
patent: 5386096 (1995-01-01), Buda et al.
patent: 5449877 (1995-09-01), Buda et al.

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