A lossless commutation pulse width modulated converter by using a resonant disconnecting circuit

The authors describe a lossless commutation buck pulse-width-modulated converter that uses a resonant disconnecting circuit (buck-LC-PWM-RDC). The operation principle, design-oriented analysis, numerical simulation, and experimental results are presented. The topology presents a novel working mode. This is obtained by using a resonant commutation cell composed of three switches, two capacitors, and two inductors. The three switches commutate under zero current, zero voltage, and zero current, respectively. The most important property of the circuit is the ability to regulate output power and voltage by pulse-width-modulation, with constant operating frequency, without load limitation, and without sacrificing the lossless commutation. As a consequence, the time response is improved, and the design procedure and implementation are facilitated