期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 68, 期 11, 页码 10750-10760出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3038071
关键词
Switches; Capacitors; Bridge circuits; Zero voltage switching; Synchronization; Soft switching; Equivalent circuits; Half bridge class-D audio amplifier (HB-CDAA); LLC converter; soft switching
资金
- National Natural Science Foundation of China [61771405]
- Sichuan Science and Technology Program [2019JDTD0003]
- Fundamental Research Funds for the Central Universities [2682019YQ02]
This article proposes and studies a front-end bidirectional symmetric bipolar outputs LLC dc-transformer for a half bridge class-D audio amplifier system, which achieves soft switching in both positive and negative audio frequency cycles to improve system efficiency.
A front-end bidirectional symmetric bipolar outputs (SBOs) LLC dc-transformer (DCX) for half bridge class-D audio amplifier (HB-CDAA) system is proposed and studied in this article. The bidirectional SBO LLC DCX provides SBOs for the HB-CDAA without producing voltage pumping on the outputs of the SBO LLC DCX. The operation of the proposed bidirectional SBO LLC DCX is analyzed, and the effects of the HB-CDAA on the operation of its front-end bidirectional SBO LLC DCX are studied. Soft switching of the proposed bidirectional SBO LLC DCX can be realized both in the positive and negative audio frequency cycles, which improves efficiency of the proposed HB-CDAA system. A 100-W prototype is built up to verify the analysis results. The experimental results show that SBOs are obtained and soft switching of all switches are achieved.
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