A Soft-Switched Bi-directional DC-DC Converter for a BLDC motor based Electric Vehicle
K. Sundararaman
Abstract
In an Electric vehicle or Hybrid electric vehicle, the bi-directional DC-DC Converter (BDC) is an essential component for the control of the energy flow between the battery and the motor. A uni-directional dc-dc converter present inside the electric vehicle can allow energy flow only from battery to the motor. As many electric vehicles have a concept of regenerative braking, it has become necessary to have a BDC, allowing bi-directional energy flow. The main objective of this paper is to design, simulate and implement a soft-switched BDC with reduced number of components along with resonant inductor and a coupled inductor added to improve the gain of the BDC. Soft switching is applied to the BDC to minimize the switching losses though ZVS technique. There is no need of additional circuit to regulate the direction of power flow. This converter is integrated with a BLDC motor with the help of a voltage source inverter (VSI) and a battery.