Hitachi Medical Corporation

Fujifilm Healthcare Corporation

Takayuki Masaki

Yuki Kawaguchi

Takuya Domoto

Hirokazu Iijima

Mina Ogawa

Syoutarou Shindou

A power conversion device comprising: a three-phase conversion circuit in which each of upper arm elements which are switching elements in an upper arm and each of lower arm elements which are switching elements in a lower arm are provided for each of three phases; and a switching control unit which alternately switches between an upper arm period of holding one of the upper arm elements ON and a lower arm period of holding one of the lower arm elements ON, wherein the switching control unit switches between the upper arm period and the lower arm period, based on an integrated value of power which is calculated by integrating a power pattern which is set beforehand.

Power conversion device, X-ray image capturing apparatus, and motor drive device

There is provided an inverter device that can detect short-circuit of a switching element of an inverter circuit even under a load condition that a PWM driving signal is very small. The inverter device is provided with means for independently supplying a short-circuit detecting PWM driving signal to respective switching elements Sto Sat different timings before the inverter circuitsupplies a PWM driving signal for supplying power to a high voltage generating device, successively turning on the respective switching elements Sto Swith the short-circuit detecting PWM driving signal, detecting on-voltages of the switching elements Sto Swhich are connected to the turned-on switching elements Sto Sin series, and detecting overcurrent or short-circuit states of the switching elements Sto S

Inverter device and X-ray high-voltage device using the inverter device

Growing community of inventors

Tokyo, Japan

Takayuki Masaki