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This paper proposes an improved cell balancing circuit for fast equalization among the lithium ion (Li-ion) batteries. Usually, the battery cell balancing circuit uses the sensor to estimate the accurate SOC (state of charge) of each battery cell and to operate the switch selectively [1], but it makes the system bulky and expensive. A simple voltage sensorless charge balancing circuit has been proposed...
This paper proposes a novel soft-switched auxiliary resonant circuit to provide a zero-voltage transition at turn on for a conventional pulsewidth-modulated boost converter in a power factor correction (PFC) application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero-voltage switching condition and simultaneously achieves both soft-switched turn...
The paper presents a high efficient charge equalizing circuit for series connected battery cells using the inductor voltage second balance and the transformer coupling principle. The proposed circuit is motivated from a general buck-boost converter with a multi-winding transformer coupling, and operates under zero voltage switching (ZVS) and zero current switching (ZCS) condition, which is achieved...
This paper proposes a novel soft-switched auxiliary resonant circuit to provide a Zero-Voltage-Transition turn-on switching for a conventional PWM boost converter in a PFC application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero voltage switching conduction and simultaneously achieves both soft switched turn-on and turn-off. Moreover, for the...
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