| Summary: | 碩士 === 國立嘉義大學 === 電機工程學系研究所 === 103 === The focus of this study is to develop a full-bridge bi-directional DC/DC power converter, which serves as an important platform between a DC bus and an energy storage tank, in buck mode and boost mode for regulating the dc level of the DC bus by energy-pump in either charging to or discharging from the energy storage tank. The storage tank is composed of lead-acid batteries, and the DC bus as a hybrid area that collects all kinds of energy. When the energy in DC bus is excess over the reference level, the converter works in buck mode to charge excess energy to batteries by constant-voltage method; conversely, when that is lack, the converter is in the boost-mode to provide energy for the load by discharging the battery. The bi-directional converter is implemented by using the UC3879 phase-shifted PWM controller with phase shift to modulate the drive signals for the converters so as to achieve zero-voltage-switching(ZVS) applications to improve system efficiency. The specifications of the proposed full-bridge bi-directional DC/DC power converter: the storage tank is in the level of 54V, DC bus of 380V, and the maximum output power of 1 kW. Experimental results show that: the highest conversion efficiency in buck mode is 90.3%; that in boost mode is 88%.
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