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A high-frequency high-efficiency three-level LCC converter for high-voltage charging applications | IEEE Conference Publication | IEEE Xplore

A high-frequency high-efficiency three-level LCC converter for high-voltage charging applications


Abstract:

For high-voltage charging applications, this paper introduces a variable-frequency zero-voltage-switching three-level LCC resonant converter, which is able to utilize the...Show More

Abstract:

For high-voltage charging applications, this paper introduces a variable-frequency zero-voltage-switching three-level LCC resonant converter, which is able to utilize the parasitic components of the high-turns-ratio transformer. By applying the three-level structure in the primary side, low-voltage MOSFETs can be used to minimize the conduction loss. Therefore, the switching frequency can be increased to shrink the size of passive components. In addition, a simulation-based process is presented for designing the resonant-tank parameters as a trade-off among the efficiency, power density and component stresses. The principle of operation for the converter is analyzed and verified on a 3 kW, 200 kHz, 10 kV charger prototype.
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

Compact high-voltage converters will be widely used in applications such as portable medical imaging, aerospace and military electronics. Pulse-width modulated (PWM) converters are not suitable for these applications because the leakage inductance and the winding capacitance of the high-turns-ratio transformer in the converter result in undesired voltage and current stresses. Therefore, resonant converters, especially the LCC-type of series-parallel resonant converter, are preferred because of their ability to effectively utilize these parasitic components [1]. A number of designs based on the full-bridge structure with LCC resonant tank have been implemented for the high-voltage applications [2]~[6]. In order to shrink the volume of passive components, thus achieving high power density, high switching frequency is desired for the converters.

References

References is not available for this document.