| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 106 === This thesis aims to develop a Three-Level Bi-Directional Half-Bridge Series-series Resonant Converter for DC micro-grid. Using dual resonant tanks, all components at the primary and secondary sides are the same. The clamped diode and capacitor with three-level circuit architecture can provide an appropriate current path to achieve zero-voltage switching on power switches. By using digital control method, both voltage across the primary side and the secondary side of the resonant tanks approach three-step square wave. In other words, the voltage stress of transformers, resonant tanks, power switches, and other components can be equalized to half of the input voltage and half of the output voltage.
The dual resonant tanks designed according to the specifications of Three-Level Bi-Directional Half-Bridge Series-series Resonant Converter, that can operate in Region-1 and Region-2, ranges up to 380V input voltage, can adjust output voltage from 300V to 400V and can output at a constant 5A current. In order to verify that this architecture can reduce voltage stress, the voltage rating of the power switches is selected only 300V. This thesis also discusses about the voltage equalization capability of the three-level architectures. A digital signal processor (DSP) chip is used as the digital controller of this converter. The measured efficiency can be up to 95% under different load conditions.
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