High Efficiency Bidirectional Dual Active Bridge DC/DC Converter for Level 3 Electric Vehicle Charging

In the current scenario, slowly but surely we are getting familiar with the concept of “electric vehicles” or “charging stations”. It’s only been a brief period of time since the notion of “electric vehicles” or EVs has been taken up in society. Many different types of “electric vehicles” are there like hybrid, plug-in hybrid, or battery-powered “electric vehicle”, one thing is clear that “electric vehicles” are intended to stay. Advancement in battery technology has allowed for lighter vehicles, longer battery “efficiency”, and cost “efficiency” as well. With these developments, the public's acceptance of an alternative fueled vehicle has also grown.

In this review paper design of “Dual Active Bridge (DAB) bidirectional DC/DC converter” for level 3 “electric vehicle (EV) charging” application is presented. To support battery charging and discharging applications, DAB topology is preferred due to its modular and symmetrical structure which facilitates high power throughput and bidirectional mode of operation. Simulation done using PLECS (Piecewise Linear Electrical Circuit Simulation) and MATLAB software. We have : “Single Phase Shift Control (SPS)” and “Extended Phase Shift Control (EPS)”, 97% peak “efficiency” and 96% full load “efficiency”, secondary “voltage”: “700V-800V DC” and primary voltage: 300 V-500V DC. This design is preferred where power density, cost, weight, “galvanic isolation”, high voltage conversion ratio, and reliability are critical factors.