Patent ID: 7254044
Filing Date: 2007-08-07
Classification: H02M

Abstract:
1. A power supply comprising: at least one converter, the converter comprising at least one primary switch controlled by a pulse width modulated control signal such that the primary switch is on for a D time period of each switching cycle of the converter and is off for a 1-D time period of each switching cycle; a current sensing element connected in series with the primary switch; a current limit circuit connected to the current sensing element, wherein the current limit circuit includes a functional circuit having a first input responsive to a first signal whose voltage is proportional to the output current of the converter during the D time period of the switching cycle of the converter and having a second input responsive to a second signal whose voltage is proportional to the output current of the converter during the1-D time period of the switching cycle of the converter; and a control circuit connected to the current limit circuit and having an output terminal connected to the control terminal of the primary switch of the converter.