Battery Charging-discharging Device Based on Pulse Width Modulation

Most traditional charging-discharging device of storage battery using thyristors has many disadvantages.Such as low power factor and high harmonics.A novel battery charging and discharging device base on PWM is researched and developed,which can operate with unit power factor and low harmonics,and feed the discharged energy back to the u-tility AC line.The hardware and software design of charging and discharging device is introduce in detail.The experimen-tal results indicate that good trace performance of input current is realized,the power factor is approaching unity,charge current has small ripple,the system designed satisfies the expect demands.