Pulse width modulator used for a power converter with a transfor

Details Pulse width modulator used for a power converter with a transfor Pulse width modulator used for a power converter with a transfor

1987-03-05

1988-05-31

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 17, 363 41, H02M 744

Patent

active

047485507

ABSTRACT:
This apparatus is a power converter which delivers a pulse produced based on a dc voltage to the primary side of a transformer with its polarity being changed per half cycle to take out an ac power from the secondary side thereof. By modulating the pulse width of a pulse delivered, the output power becomes adjustable. By detecting a current on the primary side of the transformer, current change rates at positive and negative half cycles are calculated. By comparing these change rates at the both cycles, magnetic deviation of the transformer can be detected. With the pulse width correcting means, pulse widths of pulse delivered at positive and negative cycles are adjusting so as to cancel such a magnetic deviation. The control for preventing magnetic deviation described above is realized as a control having a very fast response. In addition, such a control enables the transformer to be operative in a range extremely close to the range where the transformer is saturated.

REFERENCES:
patent: 4071812 (1978-01-01), Walker
patent: 4390940 (1983-06-01), Corbefin et al.
patent: 4541041 (1985-09-01), Park et al.
patent: 4586119 (1986-04-01), Sutton
Gijutsu, Y., "Inverter Controlled Electric Resistance Welder", Welding Technology, p. 30, Mar., 1985, Japan.

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