ZVT DC-DC PWM converters with magneticallycoupled auxiliary voltage source: a unifying analysis

A generalised circuit diagram for ZVT PWM converters with magnetically-coupled auxiliary voltage source is proposed. The generalised circuit is presented and analysed; its operation modes and constraints are defined. By means of the proposed generalised topology, published ZVT PWM converters with magnetically coupled auxiliary voltage source can be systematised and better evaluated. Based on the approach presented, the transformer (or coupled inductor) turns ratio N is determined for each topology analysed, guaranteeing a more realistic soft-switching boundary. In addition, a comparative analysis concerning the volume of magnetic ferrite cores is carried out. The comparative analysis addresses some of the most important ZVT converters with magnetically-coupled auxiliary voltage sources. The efficiency performance of these converters is evaluated and experimental results given, obtained from 1 kW–100 kHz laboratory prototypes, which confirm the value of the proposal and theoretical analysis.

[1]  L.C. de Freitas,et al.  A new ZCS-ZVS-PWM boost converter with unity power factor operation , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[2]  E. W. Beans,et al.  A study of volume versus frequency for soft switching IGBT converters , 1995 .

[3]  L.C. de Freitas,et al.  A novel ZCS-ZVS-PWM DC-DC buck converter for high power and high switching frequency: analysis, simulation and experimental results , 1993, Proceedings Eighth Annual Applied Power Electronics Conference and Exposition,.

[4]  I. Barbi,et al.  A family of DC-to-DC PWM converters using a new ZVS commutation cell , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[5]  Marian K. Kazimierczuk,et al.  State-plane analysis of zero-current-switching resonant DC/DC power converters , 1989 .

[6]  Jose Renes Pinheiro,et al.  An active auxiliary commutation circuit for inverters , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[7]  Fred C. Lee,et al.  Soft-switching techniques in PWM converters , 1995, IEEE Trans. Ind. Electron..

[8]  C. Q. Lee,et al.  Analysis and design of boost zero-voltage-transition PWM converter , 1993, Proceedings Eighth Annual Applied Power Electronics Conference and Exposition,.