Implementation of parallel zero‐voltage switching converter with series‐connected transformers

Abstract

SUMMARYThis paper presents a parallel zero-voltage switching (ZVS) DC-DC converter with series-connected transformers. In order to increase output power, two transformers connected in series are used in the proposed converter. Two buck-type converters connected in parallel have the same switching devices. The primary windings of series-connected transformers can achieve the balanced secondary winding currents. The current doubler rectifiers with ripple current cancellation are connected in parallel at the output side to reduce the current stress of the secondary winding. Thus, the current ripple on the output capacitor is reduced, and the size of the output choke and output capacitor are reduced. Only two switches are used in the proposed circuit instead of four switches in the conventional parallel ZVS converter to achieve ZVS and output current sharing. Therefore, the proposed converter has less power switches. The ZVS turn-on is implemented during the commutation stage of two complementary switches such that the switching losses and thermal stresses on the semiconductors are reduced. Experimental results for a 528-W (48 V/11 A) prototype are presented to prove the theoretical analysis and circuit performance.

Design of a ZVS PWM DC–DC converter for high gain applications

“…The zero‐voltage‐switching (ZVS) approaches are desirable for the majority of carrier semiconductor devices such as metal‐oxide semiconductor field‐effect transistors (MOSFETs), because the turn‐on loss caused by the output capacitor is large. In recent years, a number of ZVS and zero‐current‐switching (ZCS) pulse width modulation (PWM) converters have been proposed by adding resonant active snubber to conventional PWM converter to combine the desirable features of both resonance and normal PWM techniques . In these converters, the turn on and/or off process takes place under ZVS and/or ZCS during very short period of time; while the converter acts as a normal PWM converter during most of the time.…”

Soft switching DC/DC converter with high voltage gain and less current ripple

“…At t 3 , the voltage across of C r3 is decreased to zero voltage. The time duration of stage 3 is given in (14).…”

“…However, low inductor ratio between the magnetizing inductance and the series resonant inductance will increase the circulating current and increase conduction losses at the primary side. The current doubler rectifier by using two filter inductors have been developed to reduce the output ripple current for high current output applications.…”

Implementation and design of high‐power fast charger for lithium‐ion battery pack

“…A DC-DC full-bridge phase-shifted (FBPS) converter with the current-doubler rectifier features the low switching losses of power switches, and it has a low ripple current at the output side [5][6][7][8][9]. In the capacious systems, the applied Li-ion battery pack should be charged by a high-power fast charger (HPFC) due to it is hoped that the battery pack can be fully charged within 1 h. Therefore, HPFC with a power factor correction (PFC) rectifies the grid voltage into a moderately regulated DC voltage of near 400 V and reshapes the source current to follow a sinusoidal command.…”

“…In the capacious systems, the applied Li-ion battery pack should be charged by a high-power fast charger (HPFC) due to it is hoped that the battery pack can be fully charged within 1 h. Therefore, HPFC with a power factor correction (PFC) rectifies the grid voltage into a moderately regulated DC voltage of near 400 V and reshapes the source current to follow a sinusoidal command. A DC-DC full-bridge phase-shifted (FBPS) converter with the current-doubler rectifier features the low switching losses of power switches, and it has a low ripple current at the output side [5][6][7][8][9]. Although the HPFC's topology has been mentioned in literatures [10][11][12][13][14], the designing procedure in practice is not clarified.…”