Patent ID: 9041363
Filing Date: 2015-05-26
Classification: H02M

Abstract:
1. A windowless H-bridge switching converter, comprising: primary high and low side switching elements; secondary high and low side switching elements; an inductor, said primary and secondary high and low side switching elements and said inductor arranged in an H-bridge configuration, the top of said primary high side switching element being the input node for said converter and the top of said secondary high side switching element being the output node for said converter; a regulation circuit arranged to operate said primary or secondary high and low side switching elements to produce a desired output voltage at said output node, said regulation circuit comprising: a ramp signal generation circuit, comprising: a second comparison circuit which compares said ‘comp’ signal with a ‘ramp#’ signal and toggles an output when said ‘ramp#’ signal increases above or falls below said ‘comp’ signal, said switching circuit further arranged to provide said voltage ‘rampl’ to said second comparison circuit as said signal ‘ramp#’ when said mode control signal indicates boost mode operation and to provide said voltage ‘ramph’ to said second comparison circuit as said signal ‘ramp#’ when said mode control signal indicates buck mode operation; and second logic circuitry arranged to receive the output of said second comparison circuit and to provide said mode control signal in response.