Control for variable frequency drive

Details Control for variable frequency drive Control for variable frequency drive

1989-04-18

1990-02-20

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 37, 363 98, H02M 544

Patent

active

049031872

ABSTRACT:
A star-connected sensing resistor at the A.C. output side of a PWM inverter detects an output voltage across the resistor, a PWM control according to the invention then amplifies the detected voltage, compares the amplified voltage with a sine wave voltage command signal, amplifies the compared output in a P-I amplifier having a definite gain for a D.C. current, compares the P-I amplified output to a carrier and thus provides a PWM output for controlling the inverter.

REFERENCES:
patent: 4546422 (1985-10-01), Okado
patent: 4597037 (1986-06-01), Okado
patent: 4675802 (1987-06-01), Sugimoto
patent: 4772996 (1988-09-01), Hanei et al.

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