PWM inverter control apparatus

Details PWM inverter control apparatus PWM inverter control apparatus

1996-06-07

1997-12-16

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318811, 363 41, H02M 324

Patent

active

056992408

ABSTRACT:
An inverter control apparatus which employs a two-phase modulation without current waveform distortion and controllability deterioration. The inverter control apparatus includes a fixing interval decision circuit for deciding intervals of fixing respective PWM phase voltages to respective certain levels, a fixing signal generating circuit for generating a fixing signal which fixes the respective PWM phase voltages to respective certain levels during the intervals decided by the fixing interval decision circuit, a PWM signal generating circuit for generating a three-phase PWM signal based on the fixing signal and a voltage instruction value, and a fixing signal modifying circuit for modifying the fixing signal to prevent the three-phase PWM signal from exceeding capacity of the power supply.

REFERENCES:
patent: 4629959 (1986-12-01), Okuyama et al.
patent: 4641075 (1987-02-01), Asano et al.
patent: 4719400 (1988-01-01), Kurakake et al.
patent: 4847743 (1989-07-01), Kamiyama

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