Patent ID: 8933641
Filing Date: 2015-01-13
Classification: H02M

Abstract:
1. An electrical supply device, comprising: a transformer with a secondary winding configured to feed a current to a load; a control circuitry for the device; at least one electronic switch adapted to be alternately switched on and off on the basis of a control signal supplied by said control circuit; an auxiliary supply source configured for generating a stable supply voltage for said control circuit and comprising: at least one output capacitor configured to supply said stable supply voltage for said control circuit; at least one charge accumulation capacitor; a comparator sensitive to the voltage on said at least one charge accumulation capacitor; and a switch interposed between said at least one charge accumulation capacitor and said output capacitor, said switch coupled to said comparator, whereby when the voltage on said at least one charge accumulation capacitor is below a reference level; the current through said load traverses said at least one charge accumulation capacitor; and when the voltage on said at least one charge accumulation capacitor reaches a reference level, said switch couples said at least one charge accumulation capacitor to said output capacitor by transferring onto said output capacitor the charge on said at least one charge accumulation capacitor.