Patent ID: 7656687
Filing Date: 2010-02-02
Classification: H02M,H03K

Abstract:
1. A circuit, comprising: a switching power stage for producing a switched power output at a switching rate and having at least one power switching transistor; a switching control circuit for determining a turn-on time and a turn-off time of the at least one power switching transistor at the switching rate, and having an output generated at a modulated rate that is greater than the switching rate; a transformer for coupling the output of the switching control circuit to the at least one power switching transistor, whereby the at least one transistor has a gate that is DC isolated from the switching control circuit, wherein a first winding of the transformer is connected to the switching control circuit; and a demodulator circuit connected to at least one second winding of the transformer and having an output coupled to the gate of the at least one power switching transistor, wherein the output of the demodulator is at least one gate control signal generated at the switching rate from a control signal received from the at least one second winding at the modulated rate, and wherein a single period of the at least one gate control signal is generated in conformity with redundant or differing information contained in multiple periods of the output of the switching control circuit.