Omron Corporation

Seiji Oka

Masao Mabuchi

Nobuyuki Toyoura

Kenichi Inoue

Yasuhiro Tsubota

Kotaro Nakamura

Shinichi Hosomi

Katsutaka Tanabe

Tatsuo Ogaki

Kazuyoshi Imamura

Yuji Tsurukawa

Kenji Komatsubara

Masaya Kato

This power supply unit of a control system outputs a notification signal to a calculation unit when a time in which an input voltage becomes smaller than a threshold voltage exceeds a prescribed first measurement time. When detecting that a predetermined second measurement time has elapsed after the notification signal has been received, the calculation unit outputs an instruction signal instructing the execution of a process before a stop in preparation for a prescribed stop of power supply, and executes the process before the stop in place of the current process. Settings of the threshold voltage and the second measurement time are configured to be changeable by means of an external operation.

Control system and power supply unit

An isolated operation detecting method according to the present invention includes: a first step that injects a power fluctuation into the power system; a second step that measures a system cycle; a third step that adjusts the injection of the power fluctuation so that the system cycle increases when the system cycle is found increased than the previous system cycle as a result of the measuring, and decreases when the system cycle is found decreased than the previous system cycle; a fourth step that produces a change pattern of a latest system cycle on the basis of a deviation of the latest system cycle from a fixed number of cycle-passed previous system cycle; and a fifth step that determines an isolated operation on the basis of the change pattern.

Isolated operation detecting method, control apparatus for detecting isolated operation for distributed power supply

An electric power conversion device comprises switching elements making up a push-pull converter, a pulse transformer T, a rectification diode D , a rectification diode D , a choke coil L, a smoothing capacitor C, a DC magnetic deviation prevention means , and an inverter . The DC magnetic deviation prevention means detects the coil currents I , I flowing in the primary windings M , M of the pulse transformer T. By controlling (shortening) the on time of the switching element having a greater amount of current, the coil currents I , I are balanced (I &equals;I ), thereby preventing the magnetic deviation phenomena of the pulse transformer T.

Electric power conversion device with push-pull circuitry

Growing community of inventors

Ibaraki, Japan

Seiji Oka