Patent ID: 7342385
Filing Date: 2008-03-11
Classification: H02M

Abstract:
1. A drive circuit for providing two pulse width-modulated drive signals for switching converter stages in a voltage converter, the drive circuit comprising: a first feedback circuit configured to generate a first feedback signal from a first voltage to be controlled and from a first reference voltage; a signal generator configured to provide a periodic signal with an amplitude varying between a first amplitude value and a second amplitude value; a signal converter configured to generate a second feedback signal from the first feedback signal in such a way that the difference between the first feedback signal and the first amplitude value of the periodic signal at least approximately matches the difference between the second feedback signal and the second amplitude value of the periodic signal; a first pulse width modulator configured to receive the first feedback signal and the periodic signal and generate a first pulse width-modulated signal; and a second pulse width modulator configured to receive the second feedback signal and the periodic signal and generate a second pulse width-modulated signal.