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An online method of measuring battery AC impedance spectrum is presented in this paper. By adding a square wave perturbation to the steady-state value of the duty cycle of a boost power converter, AC impendence values can be devised from the responses of the battery voltage and current at the odd harmonics of the perturbation frequency. FFT analysis is applied to battery voltage and current to obtain...
Two switching patterns are described for a non-dissipating modular battery voltage balancing topology. Each balancing bridge or cell consists of an asymmetrical half-bridge and a high frequency transformer connected across two batteries rated at around 4V each. This topology has the advantage of having one switch and one diode per a battery. There are two charge transfer paths, Intra-bridge charge...
To filter the 120Hz output current ripple in our previously designed 7.2kW single-phase EV charger, this paper proposes to equip the charger with a buck-type active filter. 650V/60A enhancement mode GaN HEMTs provided by GaN Systems Inc are adopted to work at hard-switching mode. Experimental results indicated that four such switches could be paralleled to hard switch on/off ∼240A, which is the key...
For automotive applications, accurate torque production capability and high efficiency of the traction motor is very important. However, the performance of widely used interior permanent magnet (IPM) machines is influenced by temperature variations. In this paper, a control algorithm is proposed to compensate the performance variations in IPM machines due to temperature change based on online parameters...
This paper presents a simple and upgradable autonomous battery aging evaluation and test system. This system can age the battery autonomously while performing measurements of several parameters of interest based on specifications entered by user. These parameters include but are not limited to capacity fading, AC impedance spectrum, temperature, State-Of-Charge (SOC), and State-Of-Health (SOH). The...
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