High efficiency telecom rectifier using a novel soft-switched boost-based input current shaper

A family of improved ZVT PWM converters using an auxiliary resonant source

“…The ZCS con-ditions achieved to auxiliary switch permit the use of minority carrier devices which are more appropriate for these conditions. As a result, the turn-on capacitive losses presented by the ZVT converters proposed in Hua (1992), Streit (1991) and Menegáz (1999) are considerably reduced. Fig.…”

“…Although ZVT is a well-accepted technique, several ZVT commutation cells proposed in the literature suffer drawbacks such as: Hua (1992), Streit (1991);…”

Solar Based Stand Alone High Performance Interleaved Boost Converter with Zvs and Zcs

“…This circuit provides reactive current during the transition times of the MOSFETs [13]- [17] to charge and discharge the output capacitors of the MOSFETs. In addition, the control system effectively optimizes the amount of reactive current required to achieve ZVS for the power MOSFETs.…”

A classification methodology for zero-voltage transition PWM converters

“…These techniques are based on the snubber action of a capacitive element (Kim et alii, 1998;Menegáz et alii, 1999;Kim et alii, 2001;Streit and Tollik, 1991;Yaakov et alii, 1995;Liu et alii, 2000;Kim et alii, 2000;Bodur and Bakan, 2002), Fig. 7, termed ZVT PWM converters with switched AVS snubber assisted, or in the action of a resonant tank added to the auxiliary circuit (Martins et alii, 2001;Martins et alii, 2002;Gurunathan and Bhat, 2001) Although ZVT PWM converters with switched AVS snubber assisted alleviate the turn-off losses, it cannot avoid the turn-on capacitive losses and the commutation conditions still being ZCS turn-on and ZVS turn-off, which keeps the switching losses quite dependent on the device technology used as auxiliary switch.…”

“…Some topologies can further improve the efficiency by reducing the conduction losses of auxiliary circuit. This characteristic is obtained by choosing the location of the snubber capacitor of auxiliary switch in such a way that it can also limit the voltage rise rate across main switch during its turn-off process (Streit and Tollik, 1991;Yaakov et alii, 1995;Liu et alii, 2000;Kim et alii, 2000;Bodur and Bakan, 2002), Fig. 7(c) and 7(d).…”