Renewable energy systems such as energy storage system and EV charger have widely researched because of environmental issue. Isolated bidirectional DC-DC converter is critical circuit for the systems. Especially, dual-active-bridge (DAB) converter is the most popular topology owing to its simple str...
Renewable energy systems such as energy storage system and EV charger have widely researched because of environmental issue. Isolated bidirectional DC-DC converter is critical circuit for the systems. Especially, dual-active-bridge (DAB) converter is the most popular topology owing to its simple structure, simple control, and high efficiency. This paper presents DAB converters using a split-capacitor (SC) configuration. The SC configuration is derived from improved series-capacitor buck converter to reduce switch voltage. To compare between the SC and conventional DAB converters, a single-phase-shift scheme is used on both converters. Main benefits of the SC DAB converter are low switch voltage and switching loss. As a result of this, the SC DAB converter can achieve higher efficiency than the conventional DAB converter at high switching frequency. Besides, the SC configuration can be readily connected to neutral-point-clamped (NPC) converters without extra capacitor. A 3-kW hardware prototypes of the SC and conventional DAB converters were fabricated and tested to verify its performances. In addition, this paper also presents a dual output SC DAB converter for a bipolar distribution system. It is induced by applying the SC configuration to a dual output NPC DAB converter. Through two phase-shift controls, the dual output SC DAB converter regulates output power and balance two output voltages. Characteristics of the magnetic components in both converters are the same. The conventional converters for the bipolar distribution, such as triple-active-bridge converter, modular DAB converter, and NPC DAB converter, and so on, need more components than dual output SC DAB converter. As a result, the dual output SC DAB converter has higher power density than the conventional converters. A 3-kW hardware prototype of the dual output SC DAB converter was fabricated and tested under the various load conditions to verify its performances. At the end of this paper, other application schemes of SC configuration are introduced. Since SC configuration can be replaced to full-bridge and NPC configuration, it can be applied at various power converters, such as solid-state-transformer, dc-dc converter with LC voltage balancer, and so on.
Renewable energy systems such as energy storage system and EV charger have widely researched because of environmental issue. Isolated bidirectional DC-DC converter is critical circuit for the systems. Especially, dual-active-bridge (DAB) converter is the most popular topology owing to its simple structure, simple control, and high efficiency. This paper presents DAB converters using a split-capacitor (SC) configuration. The SC configuration is derived from improved series-capacitor buck converter to reduce switch voltage. To compare between the SC and conventional DAB converters, a single-phase-shift scheme is used on both converters. Main benefits of the SC DAB converter are low switch voltage and switching loss. As a result of this, the SC DAB converter can achieve higher efficiency than the conventional DAB converter at high switching frequency. Besides, the SC configuration can be readily connected to neutral-point-clamped (NPC) converters without extra capacitor. A 3-kW hardware prototypes of the SC and conventional DAB converters were fabricated and tested to verify its performances. In addition, this paper also presents a dual output SC DAB converter for a bipolar distribution system. It is induced by applying the SC configuration to a dual output NPC DAB converter. Through two phase-shift controls, the dual output SC DAB converter regulates output power and balance two output voltages. Characteristics of the magnetic components in both converters are the same. The conventional converters for the bipolar distribution, such as triple-active-bridge converter, modular DAB converter, and NPC DAB converter, and so on, need more components than dual output SC DAB converter. As a result, the dual output SC DAB converter has higher power density than the conventional converters. A 3-kW hardware prototype of the dual output SC DAB converter was fabricated and tested under the various load conditions to verify its performances. At the end of this paper, other application schemes of SC configuration are introduced. Since SC configuration can be replaced to full-bridge and NPC configuration, it can be applied at various power converters, such as solid-state-transformer, dc-dc converter with LC voltage balancer, and so on.
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