Patent ID: 8008898
Filing Date: 2011-08-30
Classification: H02M,Y10S

Abstract:
1. A switched-power circuit, comprising: an inductive storage element for coupling an input of the switched-power circuit to an output of the switched-power circuit and having a primary winding and an auxiliary winding; a switching circuit for controlling charging of the inductive storage element from an input voltage source connected to the input of the switched-power circuit to the primary winding of the inductive storage element; a control circuit coupled to the switching circuit for generating control signals for operating the switching circuit in response to a feedback signal provided from the output of the switched-power circuit; and a boost circuit having a boost input coupled to the auxiliary winding of the inductive storage element for supplying power to the control circuit from a boost output, wherein the boost circuit provides a boost output voltage at the boost output that is boosted to a voltage substantially greater than a voltage across the auxiliary winding at least during start-up of the switched-power circuit by storing energy provided from the auxiliary winding in a storage inductance at a voltage substantially equal to the voltage across the auxiliary winding and releasing energy from the storage inductance at the substantially greater voltage of the boost output.