Mitsubishi Electric Corporation

Takashi Shindoi

Kenji Inomata

Shoichi Kobayashi

Hiroshi Araki

Tomohito Mori

Toshihiro Wada

Shoji Yoshioka

Daigo Matsumoto

Aya Yamamoto

A target pole-close timing determining unit corrects a breaker characteristic correction signal of a preceding turn-on phase by using a correction amount which is proportional to an absolute value of the interpolar voltage upon turn-on of the proceeding turn-on phase, and a correction amount which is proportional to an elapsed time after a target pole-close timing of the preceding turn-on phase, to generate a subsequent phase interpolar voltage signal, and determines a target pole-close timing of the subsequent turn-on phase at a timing when the subsequent phase interpolar voltage signal is equal to or smaller than a threshold value.

Power switching control apparatus for switching timings of breaker to suppress transit voltage and current upon turning on the breaker

A storage battery equalization device is provided with: a battery pack including a plurality of storage battery modules; a plurality of equalization circuits corresponding to the respective storage battery modules, each including a DC/AC mutual converter circuit, a variable capacitor, and a transformer; external wirings interconnecting secondary windings of the transformers; voltage monitors each being connected across both electrodes of a corresponding storage battery module; and an equalization control unit. The equalization control unit determines equalization groups, each including one or more storage battery modules for discharging and one or more storage battery modules for charging, sets one of electrostatic capacitance values to the variable capacitors for each equalization group, the electrostatic capacitances corresponding to resonance frequencies of the equalization circuits, and controls a frequency of an alternating current outputted from the DC/AC mutual converter circuit of each equalization circuit, to be the resonance frequency of the equalization circuit.

Storage battery equalization device capable of charging battery pack including storage battery modules having different output voltages in short time

Growing community of inventors

Chiyoda-ku, Japan

Takashi Shindoi