Research on the Matched DC Filter Design in the Power Accumulator Battery Testing System

When testing the power accumulator battery, it is necessary to set DC filter to reduce the DC current ripples. The power accumulator battery is usually series-parallel connected by hundreds of single batteries and the inner resistance of a power accumulator battery is very small. If the DC filter is designed by the type of traditional matched filter, the flat-fading would inevitably occur. This would reduce the power transmission efficiency. This paper discussed the design philosophy of the non-matched filter and proposed a non-matched Chebyshev DC filter design method aimed at the special resistive-capacitive property of the power accumulator battery. The method is proved to be correct and feasible by simulation.