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Design of a bi-directional full bridge LLC resonant converter with a higher normalized voltage gain under backward mode
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| Author(s) |
Junping HE |
| Abstract |
A step-up control method is proposed to solve the problem of the normalized voltage gain less than 1 when the bi-directional LLC resonant converter works in backward mode. This step-up control method turns on rectifier switches to help resonant components recover their energy and improves the normalized voltage gain to 2. Working principle of the bidirectional LLC resonant converter is introduced firstly. The working procedures under continuous mode and discontinuous mode are analyzed and deduced in detail too. In the end, a 3kW prototype is built up for UPS battery charger application. The MATLAB simulation and experiment results show that this proposed bidirectional LLC resonant circuit works with a high efficiency and the normalized voltage gain can be greater than 1 in the backward operation. Certainly, most of the switching devices can still achieve soft switching at the same time. |
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| Filename: | 0089-epe2017-full-04274247.pdf |
| Filesize: | 1.167 MB |
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| Type |
Members Only |
| Date |
Last modified 2018-04-17 by System |
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