Control circuit used for a power conversion apparatus

Details Control circuit used for a power conversion apparatus Control circuit used for a power conversion apparatus

1987-04-21

1988-07-12

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 98, 363132, H02M 75395

Patent

active

047574348

ABSTRACT:
A control circuit for a power conversion apparatus, e.g., inverter and cycloconverter, which produces sinusoidal alternating current (AC) power through multiple switching operations of switching devices within a cycle and supplies the power to a load. The control circuit includes a current control minor loop for controlling the instantaneous value of the output current of the power conversion apparatus in compliance with a current reference value which is determined as the sum of the load current component determined basing on the detected value of load current, and the modification current component produced by a voltage controller to current error of output line voltage of said power conversion apparatus with respect of a sinusoidal voltage reference, whereby the output voltage of the power conversion apparatus is controlled accurately to have less distortion against harmonics of the load.

REFERENCES:
patent: 3781634 (1973-12-01), Jessee
patent: 3958171 (1976-05-01), Sekino
patent: 4377779 (1983-03-01), Plunkett
patent: 4541041 (1985-09-01), Park et al.
patent: 4546422 (1985-10-01), Okado
Y. Sekino et al., Sinano Electric Co., Ltd., "Inverter Output Voltage Waveform Closed-Loop Control Technique", Oct. 1983, pp. 205-212.

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