Patent ID: 7586762
Filing Date: 2009-09-08
Classification: G09G,H05B

Abstract:
1. A power supply comprising: a power bus for providing voltage to a load; a boost converter coupled to the power bus, wherein the boost converter converts an input voltage to a greater output voltage; a capacitor coupled to the boost converter, wherein the greater output voltage from the boost converter is stored across the capacitor; a buck converter coupled to the capacitor, wherein the greater output voltage stored across the capacitor is reduced and provided to the power bus; and a controller coupled to the boost converter and the buck converter, wherein the boost converter and the buck converter are enabled and disabled according to a pulse width modulation signal to balance an input energy into the power supply with an output energy from the power supply, wherein the pulse width modulation signal has two states, wherein further the boost converter is enabled and the buck converter is disabled when the pulse width modulation signal is in one of its two states, and the boost converter is disabled and the buck converter is enabled when the pulse width modulation signal is in the other of its two states.