A High-Efficiency Isolated LCLC Multi-Resonant Three-Port Bidirectional DC-DC Converter

Abstract

Abstract:In this paper, an isolated multi-resonant three-port bidirectional direct current-direct current (DC-DC) converter is proposed, which is composed of three full bridges, two inductor-capacitorinductor-capacitor (LCLC) multi-resonant tanks and a three-winding transformer. The phase shift control method is employed to manage the power transmission among three ports. Relying on the appropriate parameter selection, both of the fundamental and the third order power can be delivered through the multi-element LCLC resonant tanks, and consequently, it contributes to restrained circulating energy and the desirable promoted efficiency. Besides, by adjusting the driving frequency under different load conditions, zero-voltage-switching (ZVS) characteristics of all the switches of three ports are guaranteed. Therefore, lower switching loss and higher efficiency are achieved in full load range. In order to verify the feasibility of the proposed topology, a 1.5 kW prototype is established, of which the maximum efficiencies under forward and reverse operating conditions are 96.7% and 96.9% respectively. In addition, both of the bidirectional efficiencies maintain higher than 95.5% when the power level is above 0.5 kW.

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

“…In addition, the electromagnetic interference (EMI) is restricted as well. Related to the above discussions, the resonant converter characterizes high efficiency, high power density and low EMI, and fits well with the high frequency applications [1][2][3][4][5].…”

“…Then we substitute s = j·ω s into (2), and M pgain is modified as in Equations (4) and (5), where ω = 2πf op is the angular frequency of the corresponding operating frequency f op . A ω , B ω , C ω are intermediate variables:…”

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.…”

A New Control Method for a Bi-Directional Phase-Shift-Controlled DC-DC Converter with an Extended Load Range

“…Figure 1a presents a circuit topology of the proposed bi-directional phase-shift-controlled DC-DC converter which adopts ZCS in the left leg and ZVS in the right leg of the inverter-bridge so as to extend its load range to light load. The improved converter retains the bi-directional power flow capability with synchronous rectification [7,8,36] and offers linear output voltage control.…”

“…A dual active bridge DC-DC converter with ZVS capacitors [6] was provided and tested in railway systems with a power level of 80 kW whose efficiency is quite high. Similarly, a proposed multi-resonant three-port bi-directional converter [7] could guarantee the ZVS of all switches by adjusting the driving frequency under different load conditions. A new bidirectional single stage full bridge topology with a high power factor and better dynamic characteristic is introduced which leads to small harmonics [8].…”