Design Method of DC Power Supply for Superposing 20kHz/100A Peak to Peak Sinusoidal Current with Several Hundred DC Current to Analyze Battery AC Impedance

摘要

In this paper, for improving battery performance and exactly analyzing the characteristics of battery pack, a bidirectional DC power supply for superposing high frequency sinusoidal current with several hundred DC current is developed. In this product, the design method of output inductance and high speed control is proposed. The output inductance is determined by the output current ripple and the AC voltage drop on inductor. The high speed current control method is designed for generating and regulating a 20kHz sinusoidal current superposed with maximum DC 350A. The validity of proposed method is verified by experiment. Using this method, a 20kHz/100App (pp: peak to peak) sinusoidal current superposed with several hundred DC current can be regulated instantaneously at 600kHz control frequency to charge and discharge the battery pack.