Komatsu Corporation

Kenichiro Maeda

Daisuke Yoshida

Yasushi Kawaji

Koichi Kato

Masao Hagiwara

Tetsuya Nakayama

Masakazu Moritoki

In a circuit that controls the mean current flowing to a load,by turning ON or OFF in predetermined ratio the power source voltage VB applied to load,using for this purpose a switch means Sw,a capacitor C,is charged with the potential difference generated between the load,and power source whilst switch means Sw,is OFF, and a voltage for control purposes which exceeds power source voltage VB is applied to drive circuit,using this stored voltage. A high side switch can thereby be implemented using N type semiconductor elements in a simple circuit.

Load drive device

An inductive load drive device using a DC--DC converter circuit with which a high voltage is obtained by the discharge of electromagnetic energy stored in a coil to a capacitor, in which a bias is applied to the magnetic core of a coil (L) with the use of a permanent magnet (Mg) in the direction opposite to the magnetic flux induced by a current so as to increase the electromagnetic energy stored in the coil (L) and make it possible to perform efficient discharge with a small coil.

DC-DC converter circuit and inductive load drive device using DC-DC

Growing community of inventors

Kanagawa, Japan

Kenichiro Maeda