Patent ID: 7911081
Filing Date: 2011-03-22
Classification: H02M,Y02B

Abstract:
1. A method of forming a power supply system comprising: configuring the power supply system with a transformer having a primary winding, a first secondary winding having a first terminal, and a second secondary winding; coupling the first secondary winding to a secondary output of the power supply system; coupling the second secondary winding to an auxiliary output of the power supply system; configuring a first voltage regulator to control the primary winding to regulate a value of a secondary voltage formed at the secondary output and to form a first output voltage at the first terminal of the first secondary winding; configuring the power supply system for coupling a second voltage regulator having a diode and a transistor coupled in series between the first secondary winding and the auxiliary output in order to receive the first output voltage from the first terminal of the first secondary winding and to form a first regulated output voltage on an output of the second voltage regulator and on the auxiliary output; and configuring a third voltage regulator to receive the first regulated output voltage and to form a second regulated output voltage on an output of the third voltage regulator wherein the second regulated output voltage is less than the first regulated output voltage.