| Abstract |
Electric vehicles (EVs) are needed in densely populated metropolitan areas to
reduce air pollution. Efficient, low-distortion, safe battery chargers are needed to supply dc voltage to charge the high energy battery packs used in EV's. The power delivery section of the
charger is a ferroresonant transformer. Because of its inherent characteristics, the ferroresonant transformer is well suited for battery charging applications. The control section of the battery
charger periodically places a resistive load across the battery under charge that allows this change in resistance to be detected. A microprocessor controls the timing and executes the gating of the
needed switches in the circuit, and then gathers and analyzes data from battery charge monitor circuit. The charger monitor circuit measures the voltage drop across the battery, which is
proportional to the battery internal resistance, when the load is introduced. Test results indicate that a ferroresonant transformer makes an excellent base for the power delivery section of a high
voltage battery charger. |
