Nishimu Electronics Industries Co., Ltd.

Omron Corporation

Nippon Steel Corporation

Tokyo Shibaura Denki Kabushiki Kaisha

Nippon Electric Industry Co., Ltd.

Mishima Kosan Co., Ltd.

Koosuke Harada

Hiroshi Sakamoto

Shuichi Misumi

Ichiro Sasada

Nobutomo Matsunaga

Katsuaki Murata

Shinjiro Takeuchi

Katsunori Sugimori

Yoshihiro Fujii

Masahito Shoyama

Fumitaka Koga

Tosiro Kikuchi

Tokuji Shokyu

A magnetic-coupling multivibrator has a rectification circuit including first and second smoothing capacitors connected at a capacitor common junction, the first smoothing capacitor providing a high potential output, the second smoothing capacitor providing a low potential output. A switching series circuit has first and second switching elements connected in series at a common switching junction, the switching series circuit being connected in parallel to the smoothing capacitors. A first saturable transformer has a first saturation coil, a first control coil and a first gate drive coil, and a second saturable transformer has a second saturation coil, a second control coil and a second gate drive coil. A first gate control circuit interfaces the first gate drive coil with the first switching element to effect turn on and off and a second gate control circuit for interfacing the second gate drive coil with the second switching element to effect turn on and off alternately with turn on and turn off of the first switching element to effect continuous oscillation. A current source for driving the first and second control coils to control saturation of the first saturable transformer and the second saturable transformer to effect control of a frequency of the continuous oscillation.

Magnetic-coupling multivibrator

Magnetostrictive stress sensor and apparatus applying same

A switching power source device provides a desired AC/DC output by producing a pulse width-modulated waveform through ON-OFF control of a pair or pairs of switching elements connected in series with an input power source, eliminating high-frequency components of the pulse width-modulated waveform with a smoothing choke. The switching power source device is configured so that the input power source will not be short-circuited and consequently suffer a voltage and/or current surge, even when both switching elements in the pair assume the ON status at the same time by dividing the smoothing choke into two portions. The two portions of the smoothing choke are connected in series with the input power source when the switching elements in the pair assume the ON status at the same time.

Switching power source device

A PWM inverter including a saturable core and a main circuit comprising a series circuit of a main winding and a resistor in which switching means applies a DC voltage across the main circuit by time ratio control with the polarity inverted alternately, and the on-off control of the switching means is accomplished by using a saturable transformer with a saturable core.

PWM inverter with a saturable core

A power source using high-frequency phase control possessing an ability to cause the transfer of electric power between a power source side and a load side to be made through a high-frequency transformer and to effect control of the output voltage by subjecting the power source side and the load side circuits to on-off control with a certain phase difference. This power source can be used as an uninterruptible power source, a device for controlled drive of a motor, a DC constant-voltage power source, or a constant-current device, for example.

Power source using high-frequency phase control

A high frequency power supply device has an inverter circuit and an output circuit connected thereto. The inverter circuit includes a diode and a capacitor being connected in parallel to an output side of a switching transistor. A drive input voltage of the switching transistor has a dead time during which a collector voltage thereof is inverted by resonance between the capacitor and a circuit inductance of the device. The switching transistor is turned on when the diode is turned on, thereby reducing the switching loss of the switching transistor. The output circuit includes a ferroresonant circuit or a magnetic amplifier circuit which has a saturable inductor.

High frequency power supply device

A system of detecting a change in the charge put in a metallurgical furnace or the like wherein an magnetic field generator and a magnetic sensing section of a magnetometer arranged along the central axis of the exciting magnetic field of the said magnetic field generator are fitted in place on and/or inserted into a hole of the wall of such a vessel, including a metallurgical furnace or the like, as is enclosed with the said wall, such a change in the exciting magnetic flux passing through the said magnetic sensing section as is given birth by the movement of the charge is picked up in the form of electrical signals, and, the movement, the velocity, the rate of travel, the thickness of the layer, fluctuations in the shape of the layer, the circumferential distribution, the classification, and so forth, of the said charge are enabled to be properly detected in an optional manner through corresponding changes in the said electrical signals.

System of detecting a change in the charge put in a metallurgical

Growing community of inventors

Fukuoka, Japan

Koosuke Harada