Patent ID: 6115267
Filing Date: 2000-09-05
Classification: H02M,Y02B

Abstract:
An AC-to-DC power converter characterized by having no input rectifiers, comprising:a source of AC powera transformer havingat least a transformer core,at least a first primary winding anda at least a first secondary winding,primary switching means connecting the at least a firstprimary winding to the source of AC power the primary switching means characterized by a capacity to conduct current of positive, negative, and alternating polarity current when ""on"" and a capacity to block current of positive, negative, and alternating polarity current when ""off"",a primary control means to control the primary switching means in a pulse width modulation mode so as to excite the primary winding of the transformer for power conversion as a buck-derived power converter, at least a first secondary rectifying means connected to the at least a first secondary winding of the transformer,the at least a first secondary rectifying means further being connected to an output filtering means, and an output means connected to the output filtering means for providing power to an external load, whereby an input power of positive, negative and alternating polarity may be converted to a controlled DC output power.