Patent ID: 7453247
Filing Date: 2008-11-18
Classification: H02M,Y02B

Abstract:
1. A DC to DC converter comprising an inductor, first and second electronically controllable switches and a controller, wherein the first electronically controlled switch is interposed between an input node and a first terminal of the inductor and the second electronically controllable switch extends between a second terminal of the inductor and a ground, and where one of a first rectifier and a third electronically controlled switch extends between the ground and the first terminal of the inductor, and one of a second rectifier and a fourth electronically controlled switch connects the second terminal of the inductor to an output node, wherein the controller controls the operation of the first and second switches to perform voltage step down or voltage step up, as appropriate, to achieve a desired output voltage; and wherein the controller is responsive to measurements of current through the inductor and output voltage, and wherein an error voltage representative of an output voltage error and a measurement of current in the inductor are combined in an integrator to form a control signal, and the control signal is compared with a first time varying sawtooth signal to control operation of the first switch, and the control signal is compared with a second time varying sawtooth signal to control operation of the second switch.