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Analysis and implementation of a full-bridge constant-frequency LCC-type parallel resonant converter

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1 Author(s)
Tsai, M.-C. ; Dept. of Electr. Eng., Tatung Inst. of Technol., Taipei, Taiwan

A comprehensive analysis of the full-bridge constant-frequency LCC-type parallel resonant converter (LCC-PRC) is presented. Owing to operation under constant frequency, the filter designs are simplified and utilisation of magnetic components are improved. The LCC-PRC takes on the desirable characteristics of the pure series and the pure parallel converter, thus removing the main disadvantages. A useful analytic technique, based on classical AC complex analysis, is introduced for designing the LCC-PRC. By using a proper transformation on the state variable, the converter is analysed by means of a two-dimensional state-plane diagram, which shows that the converter possesses three operation modes (I, II, III). It is shown that operating the converter in mode II provides the desirable higher efficiency for a wide load range. A CPU (8031) is used to control the phase-shift time. Its control characteristic is very accurate and the cost is low. Finally, a constant-frequency controlled full-bridge LCC-type parallel resonant converter (LCC-PRC) using the CPU (8031) control is implemented

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:141 ,  Issue: 3 )

Date of Publication:

May 1994

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