Patent ID: 6515457
Filing Date: 2003-02-04
Classification: H02M

Abstract:
A power supply for receiving an input voltage and providing a main output voltage and an auxiliary output voltage, wherein the main output voltage is provided at a main output node, and wherein the auxiliary voltage is provided at an auxiliary output node, comprising:a continuous mode master converter that is configured to provide the main output voltage, wherein the master converter comprises a controller that is configured to produce a modulated control signal at a controller output node for regulating the main output voltage, and wherein the main output voltage is determined by a product of the input voltage and a duty ratio of the modulated control signal; and a discontinuous mode slave converter that is configured to provide the auxiliary output voltage, wherein the slave converter is coupled to the controller output node, and wherein the auxiliary output voltage is determined by a product of the input voltage and a ratio of the time period in which the modulated control signal is in an â€œonâ€  state to the time period in which the modulated control signal is in an â€œoffâ€  state.