Patent ID: 8737092
Filing Date: 2014-05-27
Classification: H02M,Y02B,Y02P

Abstract:
1. A control device for controlling a switching circuit, including a bridge, of a resonant converter having a resonant circuit, said control device comprising: a square wave generator configured to generate a periodic square-wave signal for controlling said bridge; a phase-shift detector configured to detect a phase-shift between said periodic square-wave signal and a current flowing through the resonant circuit and configured to output a halt signal in response to detecting that said phase-shift exceeds a first phase-shift value; a controller configured to receive the halt signal and temporarily halt the bridge by temporarily preventing the periodic square-wave signal from reaching the bridge, in response to receiving the halt signal, wherein the controller is configured to make said bridge operative again after the bridge is temporarily halted under control of the halt signal from the phase-shift detector; a sampler configured to receive a first signal representative of a difference between an output voltage from the resonant converter and a reference voltage and configured to provide a second signal based on a sampling of the first signal; and a comparator configured to compare said first and second signals and to send an activation signal when the first signal exceeds the second signal by a prefixed quantity, wherein the controller is configured to activate the bridge in response to the activation signal.