H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/120, 321/23
H02P 7/628 (1985.01)
Patent
CA 1273988
POWER CONVERTER FOR AN AC LOAD ABSTRACT OF THE DISCLOSURE A power converter for driving an AC motor includes a main circuit and a control circuit such that: the main circuit includes a forward conversion circuit that forwardly converts AC power from an input AC power source into DC power, and an inverter circuit that inversely converts the thus forwardly converted and smoothed DC power into AC power of a specified voltage and frequency; the control circuit includes a calculation device that calculates a torque current component of the AC motor, a detection device that detects occurrence of an instantaneous interruption in the AC power source, a command device that commands a frequency to be fed into the AC motor, a control device the receives a signal relative to an output signal of the command device so as to control a terminal voltage of the AC motor, and a compensation device that adjusts the output signal of the command device so that the output signal of the calculation device is caused to be substantialloy zero in response to the output signal of the detection device.
483693
Goudreau Gage Dubuc
Kabushiki Kaisha Toshiba
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