Patent ID: 6121756
Filing Date: 2000-09-19
Classification: H02J

Abstract:
An uninterruptible power supply (UPS), comprising:(a) a transformer having a primary winding and a secondary winding;(b) a low voltage converter (02) comprising a battery providing a DC voltage operatively coupled to a primary winding of said transformer, whereby a first AC voltage differential is generated across the secondary winding of said transformer;(c) a high voltage inverter (01) comprising first and second load terminals adapted to be coupled across a load in an emergency situation; a transistor Q1 and another transistor Q2, wherein said transistors Q1 and Q2 are switchable from conducting to non-conducting states and vice versa so as to produce an output voltage waveform across said load terminals when a load is coupled thereto, said output voltage being characterized by an amplitude that varies between a positive peak (V) and a negative peak (-V); and(d) coupled inductor means (60) comprising a first winding (63) operatively coupled to said battery, and at least a second winding (61, 62) operatively coupled to said high voltage inverter, wherein said first and second windings are wound around a common core.