Rohm Co., Ltd.

Shimadzu Corporation

Fumihiko Ito

Kenji Otani

Motoyasu Yoshino

Taketo Kishi

Yuji Maeda

An X-ray tube billing system for a fluoroscopic apparatus for non-destructive inspection configured to perform X-ray fluoroscopy on a subject using an X-ray tube includes a fluoroscopy time detector configured to detect a length of time during which the X-ray fluoroscopy has been performed using the X-ray tube, and a billing amount calculator configured to calculate a billing amount related to use of the X-ray tube based on the length of time during which the X-ray fluoroscopy has been performed, which is detected by the fluoroscopy time detector.

X-ray tube billing system

A motor control circuit includes a driver which amplifies a drive signal and outputs a drive current to a coil of a motor ; a detection circuit which detects a drive waveform of the drive current and outputs a detection pulse representing a rotating condition of the motor as a detection signal ; and a drive signal generating circuit which generates in response to the detection pulse a trapezoidal wave having a linear inclination at front and rear parts thereof as the drive signal.

Motor control circuit and motor drive system using the same

A motor control apparatus for rotating a motor smoothly. A sine wave form which is an ideal wave form of a signal is stored, and the motor is driven by a signal having the ideal wave form obtained by correcting the period and the phase of the stored sine wave form. A comparator receives a detection signal which indicates the rotating state of the motor through an A/D converter, and obtains the correction values of the current period and phase. A wave form setting means corrects the set period and phase, generates a sine wave having the corrected period and phase on the basis of the sine wave data stored in a sine wave data region, and outputs a driving signal having the sine wave form through a D/A converter.

Motor control apparatus

A motor control circuit and a motor drive system using the same, in which a first transistor between the collector-emitter of which a first current in response to a drive signal for driving a motor is flown and a second transistor the base of which is connected to the base of the first transistor and between the collector-emitter of which a second current in response to the first current is flown are included, and the second current or a current dependent upon the second current is outputted to the coil of the motor as a motor drive current and the second transistor is turned to the saturation condition when the voltage at the coil rises more than a predetermined value, comprising a detection circuit of the saturation condition which is connected to the base of the second transistor and generates a detection signal in response to a voltage variation of the base of the second transistor when the second transistor operates under the saturation condition; and a feed-back circuit which decreases the second current by decreasing the first current flowing through the first transistor in response to the detection signal.

Growing community of inventors

Kyoto, Japan

Fumihiko Ito