Patent ID: 6175225
Filing Date: 2001-01-16
Classification: H02M,Y02B

Abstract:
A switching arrangement for a dc--dc converter, for connecting one end of an inductor, which is included in the converter and the other end of which is connected to a dc output, alternately to a dc input for receiving a dc input voltage of a given polarity and to a common point, said arrangement having a switching signal input and a switch output for connection to the one end of the inductor, said arrangement comprising first and second controllable semiconductor switches connected in series between the dc input and the common point with the first switch connected to the dc input and the second switch connected to the common point, and first and second couplings from the switching signal input to control inputs of the first and second switches respectively for controlling the switches to operate in antiphase in response to the application of a switching signal to the switching signal input, the second coupling being provided with a threshold-responsive disable signal input for disabling control of the second switch to its closed state when the voltage on the disable signal input has said given polarity relative to a predetermined threshold value, the connection between the first and second switches being connected to the switch output and the disable signal input, characterized in that said predetermined threshold value is substantially equal to the voltage at said common point.