I. Introduction
Pulse width (PWM) converters can be obtained from the PWM cell illustrated in Fig. 1(a). In the PWM converters, the commutations occur from the switch to the diode, or from the diode to the switch, producing losses and generating electromagnetic interference (EMI), mainly due to the physical features of the semiconductors. To minimize these problems, several types of non-dissipative switching techniques, which also control di/dt and/or dv/dt, have been presented, such as passive [1] and active [2] snubbers, ZVS [3], ZCS [3], ZVT [4], ZCT [5] and ZCZVT [6] auxiliary commutation circuits (ACC).