Method and apparatus for controlling refrigerator cycle

Details Method and apparatus for controlling refrigerator cycle Method and apparatus for controlling refrigerator cycle

1993-12-02

1996-01-09

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

388811, 318599, H02P 528

Patent

active

054831415

ABSTRACT:
In case an instantaneous over-current flowing through switching elements is detected between a predetermined rise time point and a predetermined fall time point of each of the PWM control pulses, the output of the duty control circuit is stopped immediately. In other words, the duty factor of the PWM pulse signal to be outputted as it is under the normal conditions is reduced so as to be cut off after the over-current has been detected. Therefore, it is possible to protect the switching elements of the inverter from breakdown due to over-current, without stopping the operation of the compressor and the compressor motor.

REFERENCES:
patent: 4584636 (1986-04-01), Ando et al.
patent: 5017855 (1991-05-01), Byers et al.
patent: 5210684 (1993-05-01), Nam
patent: 5304913 (1994-04-01), Anticole

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