Kabushiki Kaisha Toshiba

Teruo Nakagawa

Akio Hirata

Suzuo Saito

Tadao Mose

Akihiko Kuroiwa

Kazuto Kawakami

Osamu Tanaka

Kohsaku Ichikawa

Tsugunori Kuga

Mitsuhiro Shibata

A power supply for negative impedance discharge loads such as discharge tubes used in gas laser systems, in which the discharge power is supplied not from the voltage source but from the current source through the current transformer so that stabilized and well balanced discharge currents can be supplied to a plurality of discharge loads.

Power supply system for negative impedance discharge load

A helper drive apparatus for a turbine drive system in which a load is mainly driven by a turbine and a helper motor is used for assisting the drive for the load, comprising: a turbine control circuit, coupled to the turbine, for controlling output power of the turbine in accordance with a turbine power reference signal; a motor control circuit, coupled to the helper motor, for controlling output power of the helper motor in accordance with a motor power reference signal; a speed control means, coupled to the turbine, for detecting a difference between a given speed reference signal and a speed signal indicating an operation speed of the turbine, and providing a master power reference signal representing the difference; and a power sharing ratio control circuit, coupled to the speed control circuit, turbine control circuit, and motor control circuit, and being responsive to a given power sharing instruction signal, for sharing the master power reference signal to the turbine power reference signal and the motor power reference signal such that a ratio between the turbine power reference signal and the motor power reference signal depends on a value of the given power sharing instruction signal.

Helper drive apparatus for turbine drive system

A turbine helper drive apparatus has an induction motor coupled to a turbine, and a power converter for power-controlling the motor. Part of the load of the turbine is shared by the motor in accordance with preset power for power control, so that auxiliary drive to compensate for the insufficient capacity of the turbine is performed and cheaper, late-night electric power is effectively utilized.

Turbine helper drive apparatus

Growing community of inventors

Tokyo, Japan

Teruo Nakagawa