Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1997-12-09
2000-01-11
Berhane, Adolf Deneke
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 70, 363125, 323908, 62150, 62158, 62178, H02M 700, F25D 2100, F25D 1700, G05D 2332
Patent
active
060143258
ABSTRACT:
A controlled DC power supply for a refrigeration appliance is disclosed for reducing heat dissipation and power loss. The refrigeration appliance has AC-powered components, such as compressors and fans, and DC-powered components, such as relays and solenoids. The relays operate to supply AC power from an AC input to the AC-powered components. The relays are selectively activated or deactivated by the controller through enable signals in response to factors such as time and/or temperature. The power supply has an AC-to-DC power conversion circuit for converting AC power at an AC input to one or more DC power outputs for powering DC-powered components. When a group of DC-powered components powered by the same DC power output, such as a group of relays, do not require DC power, the controller selectively disables or reduces a portion of the AC-to-DC power conversion circuit to reduce power consumption and heat dissipation therein. The AC-to-DC power conversion circuit also may utilize a transformerless (reactive) input stage and a dual-output, dual-polarity DC output stage.
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Berhane Adolf Deneke
Paragon Electric Company, Inc.
Vu Bao Q.
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