Method and apparatus for controlling PWM inverters

Details Method and apparatus for controlling PWM inverters Method and apparatus for controlling PWM inverters

1985-04-16

1986-07-08

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318811, H02P 540

Patent

active

045995494

ABSTRACT:
An AC motor such as an induction motor or a synchronous motor is driven by a PWM inverter circuit. Power switching elements of the inverter circuit are ignited by PWM pulses resulting from comparison of a carrier wave signal with a sine wave modulation signal at a frequency proportional to a frequency setting signal so as to control the inverter circuit. A current polarity detector detects positive and negative components of a DC current flowing in the input side of the inverter circuit. The frequency setting signal is so corrected as to be decreased when only the positive current component flows in excess of one period of the carrier wave signal or increased when only the negative current component flows in excess of the one period.

REFERENCES:
patent: 3753063 (1973-08-01), Graf
patent: 3800199 (1974-03-01), Weigand
patent: 3935518 (1976-06-01), Yatsuk et al.
patent: 4186334 (1980-01-01), Harata
patent: 4322671 (1982-03-01), Kawada et al.
patent: 4420718 (1983-12-01), Sakai et al.
patent: 4437050 (1984-03-01), Overzet

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