Apparatus and method for controlling the operating frequency of

Details Apparatus and method for controlling the operating frequency of Apparatus and method for controlling the operating frequency of

1991-12-18

1993-05-11

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 39, 363 95, 318801, 318805, 318811, H02P 736, H02M 112

Patent

active

052106845

ABSTRACT:
Line voltage of any two phases of a three phase AC power supply is detected through a high pass filter. The line voltage is amplified by an amplifier. A microprocessor receives the amplified line voltage via an input terminal. The microprocessor determines whether the line voltage is below a first set value, between the first set value and a second set value or above the second set value. When the line voltage is below the first set value, the compressor operates in the previous operation state. When the line voltage is between the first set value and the second set value, the compressor operates in the operation state 1 step lower than the previous speed. When the line voltage is above the second set value, the compressor operates in the lowest operation state. Whereby the noise and vibrations generated in the compressor are suppressed.

REFERENCES:
patent: 4024444 (1977-05-01), Dewan et al.
patent: 4186334 (1980-01-01), Hirata

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