Parallel ZVS converter with series connected transformers

Abstract

This 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 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 zero voltage switching 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 528W (48V/11A) prototype are presented to prove the theoretical analysis and circuit performance.

FPGA-Based Multi-Wave Pulse High Power Factor Power Supply

“…The three-phase SPWM wave generating schematic diagram is shown in Figure 5, figure cnt8, cnt10 is frequency module, through frequency system clock into the needed frequency; data_sin and data_edlta is generated sine wave and triangular wave module; the compare module is used to compare the triangle and sine wave amplitude, but also the key module to generate the Simulation waveform of three-phase SPWM is shown in figure 6. [12] VI. CONCLUSION This paper presents an FPGA-based multi-pulse waveform with high power factor power supply.…”