San Diego State University Research Foundation

Other

Hefei Gotion High-Tech Power Energy Co., Ltd.

Chunting C Mi

Fei Lu

Yunlong Shang

Dingguo Wu

Xiaohong Hu

Yuhong Fu

Hua Zhang

Bing Han

Bing Xia

Panpan Hu

Embodiments of the present disclosure provide an active equalizer circuit, a battery management system, and a power supply system. The active equalizer circuit comprises a plurality of switching transistors, a driving transformer, a multi-port converter, a buck converter, and a microcontroller. Each of the switching transistors is coupled to a battery cell in the series battery pack on a one-to-one basis. The multi-port converter comprises an equalizing transformer and a bridge converter. The microcontroller is configured to output a first control signal to the buck converter, to facilitate the buck converter to transform an output voltage of the series battery pack and output the transformed output voltage to the bridge converter, and output a second control signal to the bridge converter, to control an operation state of the bridge converter.

Active equalizer circuit, battery management system, and power supply system

Embodiments described herein are directed to wireless power transfer systems, which can include a vertical pair of an inner and an outer coupling capacitors. According to certain embodiments, one plate from each of the outer coupling capacitor at least in part overlaps one plate of the inner coupling capacitor on a primary side and another plate from the outer coupling capacitor at least partially overlaps another plate of the inner coupling capacitor on a secondary side. Each plate of the outer coupling capacitor has a larger area than each plate of the inner coupling capacitor. Further, a power transfer unit is included and configured to transfer power capacitively through the vertical pair of coupling capacitors, where the power transfer unit can include first and second inductors coupled to each plate of the outer coupling capacitor, respectively.

Wireless capacitive power transfer designs and systems

The present disclosure is directed to method of automatic circuit fault detection. The method includes inputting a common periodic wave voltage to each of a plurality of battery cells of a battery pack. Recursively calculated correlation coefficients for each neighboring pair of the battery cells are used to determine whether a common battery cell of two neighboring pairs is faulty. The disclosure further describes equalizers for multi-cell battery packs and series-connected battery strings. The equalizers can include a coupling capacitor comprising a plurality of small plates coupled between the two series-connected metal-oxide-semiconductor field-effect transistors (MOSFETs) connected to each battery cell, and a larger plate, wherein the larger plate is commonly coupled to all of the small plates. A plurality of battery string groups can be equalized, where each cell includes one transformer winding and a MOSFET. The MOSFETs are driven using one pair of complementary pulse width modulation signals.

Methods and circuitry for fault detection and automatic equalizers for battery packs

Growing community of inventors

San Diego, CA, United States of America

Chunting C Mi