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New integration concept of auxiliary commutation circuits: ZVT case study | IEEE Conference Publication | IEEE Xplore

New integration concept of auxiliary commutation circuits: ZVT case study


Abstract:

This paper proposes the concept of integrated ZVT auxiliary commutation circuits applied to systems with power conversion multi-stages. With this concept, it is possible ...Show More

Abstract:

This paper proposes the concept of integrated ZVT auxiliary commutation circuits applied to systems with power conversion multi-stages. With this concept, it is possible to reduce the number of additional elements as well as to minimize the circulating reactive energy. A new integrated ZVT auxiliary commutation circuit is applied to a double-conversion UPS to demonstrate the functionality of this new concept. By using this new circuit, the main switches operate under soft-commutation of ZVT type, and the auxiliary switches are turned-on and turned-off under ZCS or ZVS. Experimental results of a 1 kW@100 kHz prototype are presented the feasibility of the proposed concept.
Date of Conference: 20-25 June 2004
Date Added to IEEE Xplore: 15 November 2004
Print ISBN:0-7803-8399-0
Print ISSN: 0275-9306
Conference Location: Aachen, Germany

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).

References

References is not available for this document.