Inventor

MATSUDA YASUO

69 patents

⚠️ This page may combine multiple inventors who share the name “MATSUDA YASUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

MATSUDA YASUO

HITACHI LTD

Power supply control system

Drive circuit for an insulated gate transistor having overcurrent detecting and adjusting circuits

Solid state current sensing circuit and protection circuit

Monolithic integrated circuit device

Parallel circuit module including a diode and an IGBT

Switching power supply

Reactive power compensator for electric power system

Control circuit for power converter apparatus

Method of controlling the output voltage of a pulse width modulation inverter

Method and apparatus for controlling induction motor

Method of controlling pulse width modulated inverter for use in induction motor drive

Twelve-step current source inverter

Power conversion apparatus

Voltage resonance type switching power source apparatus

Circuit for controlling an electric power supply apparatus, a method therefor and an uninterruptible power supply

DC-DC converter and a computer using the converter

Pulse width modulated inverter with high-to-low frequency output converter

Method and apparatus for controlling PWM inverter

Method and apparatus for detecting shortcircuit in arm of GTO inverter

Level shift circuit for controlling a driving circuit

Current and frequency converter having means to reduce switching losses

Capacitive voltage lowering circuit with dual outputs

Apparatus for repeatedly applying short-circuit pulses to a current type inverter for output current control

Variable speed control apparatus for induction motor

Inverter device using gate turn-off thyristors

SUMITOMO ELECTRIC INDUSTRIES

Coated optical fiber and its manufacturing method

Optical fiber

Plastic optical fiber preform, and process and apparatus for producing the same

Plastic optical fiber preform, and process and apparatus for producing the same

Plastic optical fiber preform, and process and apparatus for producing the same

Plastic optical fiber preform, and process and apparatus for producing the same

Optical switch

Method for screening optical fiber and apparatus for carrying out method

Optical switch for use with optical fibers

Method for controlling fiber diameter during optical fiber drawing process

Optical fiber drawing furnace with a zig zag heating element

Slitted winding wheel for optical fiber

Resin coating device for optical fiber

Coupler-type optical switch and process for producing the same

Optical fiber and process for producing the same

Coated optical fiber and method of making the same

Plastic optical fiber preform having a jacket layer

Polymer clad optical fiber

Optical glass fiber

Coated optical fiber

Coated optical fiber and fabrication process therefor

Physical property evaluation method for optical fiber coating, and coated optical fiber

JAPAN SERVO

Stepping motor driver

Motor control system

MATSUDA YASUO

Method and apparatus for forming profiled plastic products involving extrusion, roller shaping and cutting