Half-bridge CLL resonant rectifier with quantum mode control

A quantum mode controller for the operation of the half-bridge CLL resonant converter as a high power-factor rectifier is introduced. The controller uses zero-crossing detection on the resonant current that flows through the switches to ensure operation at both resonant frequency and zero-current switching conditions. In contrast to conventional regulators, this architecture adapts itself automatically to the deviations of the power stage parameter values and is robust against wide load variations. The theoretical contributions of the paper include a control-oriented dynamic model that describes the low-frequency large-signal transient behaviour of the resonant rectifier and a systematic control design procedure based on the sliding mode control theory. Experimental tests and results validate the expected features of the quantum mode controller, such as low-harmonic content, stability and robustness.