Design and Implementation of Multiple-Output Power Supply for Electric Vehicle

The drive circuit of an electric vehicle requires a lot of different isolation voltage. In this paper, a multi-output power supply is designed to supply the drive circuit of an electric vehicle. The power supply system uses a flyback converter to achieve the isolated multi-output sources that contain fourteen sets of output voltage. In order to reduce noise interference, six sets of isolated sources are provided to drive insulated gate bipolar transistor (IGBT). Five sets of isolated sources are supplied for 485 cards, speed detector, and controller circuit of the flyback power supply. Three sets of common ground sources are supplied for status interface, the center processing unit, and the operation amplifier. In addition, a discontinuous conduction mode (DCM) small-signal model, with a peak current mode control, is built, and the feedback controller is designed for stabilizing the desired power supply. Finally, a 20W multiple-output power supply is built to provide the drive sources of the electric vehicle.