Bidirectional Resonant Converter Research Articles

High‐power bidirectional resonant DC–DC converter with equivalent switching frequency doubler

A high-power double frequency bidirectional symmetrical DC–DC resonant converter is proposed to reduce the sizes of the passive components and increase the cost-effectiveness. Inspired by the bipolar and unipolar modulations for the single-phase inverter, an asymmetrical duty cycle double frequency modulation is originated for high-power bidirectional resonant converters whose switching frequency and power density are significantly limited by the high-power devices. The equivalent operating frequency of the resonant tank becomes twice of the switching frequency, which effectively reduces the volumes and costs of the passive components, especially for high-power high-voltage applications. Moreover, the proposed converter has the same output characteristics for the two power flow directions, which not only symmetrises the bidirectional frequency control, but also simplifies the design of the resonant components. The converter operation principle is illustrated and the converter performances are analysed including the principle of the double frequency modulation, output characteristics and soft switching condition. Finally, a 5 kW prototype is built to verify the analysis, and the resonant components for the conventional bidirectional resonant converter are also designed and compared to illustrate the advantages of the proposed converter.

A Resonant Dual Full-Bridge Class-E Bidirectional DC-DC Converter for Fuel Cell Electric Vehicle

The interests on energy storage schemes, bidirectional dc-dc converter and uninterruptible power supplies have been increasing nowadays as there wide researches are undertaken in the area of electric vehicles. A modified bi directional class-E resonant dc-dc converter is introduced here in this proposed topology for the application in electric vehicles. The advantages of soft switching techniques have been utilized for making analysis simple. The main advantage here in this system is that it can operate in a wide range of frequencies with minimal switching loss in transistors. This paper elaborates a detailed analysis on converter design and the same has been simulated and verified in Matlab/Simulink.

High Frequency Isolated Series Parallel Resonant Converter

Objective: Due to small size and high power density, the DC / DC converter is gaining more attention in renewable energy systems. In this paper, Bi-Directional Series-Parallel Resonant Converter (SPRC) are simulated at high frequency and the results are presented. Method/Analysis: The converter is analyzed using MATLAB Simulink for the different values of input voltage with switching frequency remains same. Results/Findings: The efficiency of the SPRC has linear behavior with the input voltage. Conclusion/Application: Zero Voltage Switching (ZVS) High frequency bidirectional resonant converter suitable for low voltage DC applications.

12V, 1000A 절연형 양방향 공진형 DC-DC 컨버터 개발

12V, 1000A 절연형 양방향 공진형 DC-DC 컨버터 개발

고효율 특성을 갖는 양방향 공진컨버터

In this paper, For achieving the high gain and resonant characteristics in both of the power flow directions, a bidirectional resonant dc-dc converter with auxiliary switches is proposed. Auxiliary switches are connected in the primary and secondary side of the bidirectional resonant dc-dc converter, respectively. A 800W prototype bidirectional resonant dc-dc converter for interfacing the 400V DC buses in the energy storage system is built and tested to verify the validity and applicability of this proposed converter.

A 10-kW Two-Stage Isolated/Bidirectional DC/DC Converter With Hybrid-Switching Technique

This paper suggests a two-stage isolated/bidirectional dc/dc converter with hybrid-switching technique. High-frequency bidirectional resonant converter with a fixed gain can reduce the bulky transformer size by minimizing Insulated Gate Bipolar Junction Transistor (IGBT) turn-off loss due to tail current, and it forms bidirectional power flow without any control operation. Pulsewidth-modulation nonisolated converter takes in charge of bidirectional control, and its serious turn-off switching loss is alleviated using MOSFET-assisted hybrid-switching structure. The proposed scheme provides low switching loss and removes snubber circuitry so a high efficiency and a high power density can be obtained in high-voltage/high-power bidirectional applications.