An LLC Converter Family With Auxiliary Switch for Hold-Up Mode Operation
| Autor: | Zhihua Yang, Yan-Fei Liu, Yang Chen, Jahangir Afsharian, Peng Fang, Hongliang Wang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Engineering
business.industry 020208 electrical & electronic engineering Mode (statistics) 020302 automobile design & engineering 02 engineering and technology Converters Inductor 6. Clean water law.invention Capacitor 0203 mechanical engineering Hardware_GENERAL law 0202 electrical engineering electronic engineering information engineering Electronic engineering Equivalent circuit Electrical and Electronic Engineering business Frequency modulation Pulse-width modulation Voltage |
| Zdroj: | IEEE Transactions on Power Electronics. 32:4291-4306 |
| ISSN: | 1941-0107 0885-8993 |
| DOI: | 10.1109/tpel.2016.2604368 |
| Popis: | This paper proposed a new half-bridge (HB) LLC resonant converter family with pulse-width modulated (PWM) auxiliary switch (sLLC converter) for hold-up mode operation. The proposed sLLC converters could operate with synchronous rectifier, which is suitable for low-output voltage applications. In the proposed converters, an auxiliary switch is added at the primary side to provide charging path for the series resonant inductor. For nominal 400-V input, sLLC achieves same performance as conventional LLC converter, and all the good features such as soft switching are naturally retained. For slight input voltage fluctuation, frequency modulation is used to regulate the output voltage. When the input voltage reduces further, HB switches will operate at constant minimum frequency, and the auxiliary switch will operate in the PWM mode to energize the resonant inductor with the bus voltage directly during hold-up period. Thus, the converter achieves higher voltage gain, and the output voltage can be maintained at desired level. To verify the effectiveness of the proposed sLLC converter, operational principle and equivalent circuits will be carefully explained and analyzed in this paper. A 300-W prototype is built for 250–400-V input 12-V output application. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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