Comparative Analysis and Optimization of Power Loss Based on the Isolated Series/Multi Resonant Three-Port Bidirectional DC-DC Converter

Abstract

Based on the loss distribution and efficiency analysis, a comparative study between a series resonant three-port bidirectional DC-DC converter (SR-TBC) and a multi-resonant three-port bi-directional DC-DC converter (MR-TBC) is reported here. By using the Fourier equivalent analysis method in hand, the resonant current, switching current expressions, zero voltage soft switching (ZVS) conditions of MR-TBC and SR-TBC are deduced. Besides, in consideration of efficiency and soft switching aspects, the loss models of main power components and resonant elements are integrated and optimized for both topologies. Their loss distributions are established, and the different effects derived from the adoption of SiC MOSFET and Si MOSFET on the converter efficiency are discussed. Finally, to verify the theoretical analyses, comparative experiments under diverse load states are conducted based on the prototypes of the MR-TBC and SR-TBC. The obtained results demonstrate that the MR-TBC successfully broadens the ZVS range and thus achieves higher efficiency along the entire load range.

Model-Based Optimization of an LLC-Resonant DC-DC Converter

“…A number of approaches have been developed to optimize power electronic devices [5][6][7][8]. Typically, these devices are based on sophisticated mathematical methods employed by engineers and designers, who actually design the devices, and that are difficult to reproduce.…”

“…Typically, these devices are based on sophisticated mathematical methods employed by engineers and designers, who actually design the devices, and that are difficult to reproduce. Optimizations are focused primarily on loss reduction and efficiency gain [7,8], and not applied to improve dynamics or guarantee a device's performance. The necessary dynamical characteristics are achieved mainly with the controller and the use of more complex control methods [9,10] instead of the optimization of other parameters of the circuit.…”

“…To determine the intervals of conduction for the transistors and their respective built-in reverse diodes, the following logic is used: If the direction of the current in the resonant circuit coincides with the polarity of the supply source, conduct the transistors-otherwise, the inverse diodes conduct the current. It is known from the operating principle of these circuits that energy is consumed when the transistors carry the energy from the power supply, and the return diodes return energy [7,8]. In the circuit diagram shown in Figure 1 there are three reactive elements, from which it follows that the system of linear differential equations is of the third order, having for each one of these reactive elements one equation of the state.…”

A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications

“…While when the switching frequency is higher than the resonant frequency, the efficiency circumstances of these two converters are quite different. As stated in [26], the LLC converter loses the zero-current switch (ZCS) characteristic under this condition. The turn-off current also increases.…”

Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

“…With advantage of ZVS + ZCS, the bidirectional resonant DC-DC converter (BRDC) is gaining more attention in DC distribution system or DC microgrid applications [1][2][3][4][5][6][7][8]. All the power switching devices, including metal oxide semiconductor field effect transistor (MOSFET) switches and diodes have the desirable soft-switching features, and the switching loss is greatly decreased.…”