H - Electricity – 02 – H
Patent
H - Electricity
02
H
321/76, 323/9
H02H 7/125 (2006.01) H02H 9/00 (2006.01)
Patent
CA 1141822
Abstract of the Disclosure The invention relates to a dual DC voltage power supply providing positive and negative DC vol- tages including soft turn-on circuitry to limit in- rush current to substantially uncharge capacitive loads. The power supply includes a plurality of rectifier cir- cuits providing at least one positive DC voltage level and at least one negative DC voltage level from at least one AC input voltage. A plurality of power ter- minals receive the rectified voltage, and an output terminal is provided for each DC voltage level. A reference terminal is provided for connection to a point of reference potential. A control for each DC voltage level is coupled in parallel relationship with the capacitive load and is responsive to the voltage developed across the load attaining a predetermined value whereupon the control provides a firing signal. A turn-on current suppressor is provided for each DC voltage level, the suppressor having a relatively high impedance connected between one of the power terminals and the output terminal wherein the impedance limits the magnitude of current supplied to the load in the absence of the control firing signal. A switch, having a main current conduction path coupled in parallel with each suppressor impedance, is responsive to the control firing signal to provide a low impedance by- pass across the suppression impedance.
346145
Exxon Research And Engineering Company
Swabey Ogilvy Renault
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