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In household applications, the power router is a cost‐effective device for AC/DC power conversion. To make it compatible with various types of DC loads without introducing extra power conversion stages, it is important that the power router can work in an extremely wide DC voltage range. However, this poses great challenges for the controller design. To address this concern, a double mode control scheme is proposed. The high frequency resonant DC/DC converter is employed together with a DC/AC converter to form the power router. Its circuit features on voltage gain and active power ratio are presented to guide the accurate controller design. Mode I is designed to ensure the high efficiency DC/DC conversion while the desired output DC voltage of power router is tracked by a DC/AC converter. For mode II, the phase shift scheme is triggered to eliminate the loss induced by the reactive power, and the desired output DC voltage is adjusted by DC/DC converter. Mode I and II cooperate to guarantee the wide DC voltage range to satisfy different load requirements. The experimental validation in a lab‐scale power router prototype shows that the proposed scheme not only provides extremely wide voltage range, but also guarantees high efficiency by effectively tracking the resonant frequency.
In the hybrid AC/DC nano‐grid, the LLC‐type DC transformer (DCT) is widely utilized in the DC and AC bus connection system (BCS) with high frequency to improve the system power density. However, it always employs the simple open‐loop scheme for not increasing the control complexity of the nano‐grid system, which creates a big challenge on the inherent features of the DCT circuit for the energy efficiency and conversion ability. Therefore, a robust and low‐cost design approach of the LLC‐type DCT is put forward in this paper based on the specific requirements of hybrid AC/DC nano‐grid. First of all, the design challenges of the LLC‐type DCT are discussed by analyzing the functions of BCS in nano‐grid application. Then, the detailed parameter design approach is presented step‐by‐step to meet the energy efficiency and conversion requirements in the full power range. Finally, a 6 kW nano‐grid prototype is established to verify the effectiveness of the proposed design method. The results show that the designed DCT can enjoy good energy efficiency and conversion ability with simple control and hence accommodate the high‐frequency nano‐grid application.
This thesis contains materials from 5 papers published or under review in the following peer-reviewed journals where I was the first author.Chapter 3 is published as X.
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