Power converter for AC load

Details Power converter for AC load Power converter for AC load

1988-11-14

1990-02-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, H02P 540, H02P 130

Patent

active

049010018

ABSTRACT:
A power converter for starting an AC induction motor includes a frequency detector which compares the frequency of an AC output of the converter with a predetermined frequency and generates a detection signal if the AC output frequency is lower than the predetermined frequency, a current controller which controls the power converter such that an AC output current supplied to the motor is determined in accordance with a given current reference if the detection signal is generated, and a voltage controller which controls the power converter so that an AC output voltage applied to the motor is regulated in accordance with a given voltage reference if the detection signal disappears.

REFERENCES:
patent: 3696278 (1972-10-01), Kunyoshi et al.
patent: 3787724 (1974-01-01), Pedersen et al.
patent: 3939387 (1976-02-01), Maeda
patent: 3971972 (1976-07-01), Stich
patent: 4238821 (1980-12-01), Walker
patent: 4334182 (1982-06-01), Landino

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