Tamura Corporation

Tomohiko Yoshino

Kiyotaka Yoshida

Hirotoshi Aoki

Hiroo Ogawa

Hisashi Shibata

A drive circuit is provided. When the switching element is in turn-on state and a collector-emitter voltage of the switching element is equal to or higher than a first predetermined voltage value, the first diode is turned on; the first transistor and the second transistor are turned on; and, after a mask time in which a first capacitor is started to be charged with a current from a current source and a voltage value at two ends becomes equal to or higher than a second predetermined voltage value higher than the first predetermined voltage value, an abnormality detection signal is output to the control unit. The control unit stops an output of the pulse signal to the switching element in response to the abnormality detection signal.

Drive circuit

A gate driver includes: driver boards mountable on an IGBT module which is a driving-target external device; gate driver circuits which are formed on the driver boards and each apply a drive signal generated using power and a signal which are externally input through an input connector, to semiconductor elements of the IGBT module; and an insulating surrounding member disposed to surround a peripheral edge of the input-side driver board.

Driver circuit device for driving external device having semiconductor element

An electronic componentincludes: a circuit board modulewhich is composed of a plurality of layers, and in which a primary circuitand secondary circuitsare each formed using wring patterns of a first layer Lto an eighth layer L; and a magnetic corewhich magnetically couples the primary circuitand the secondary circuits. The circuit board moduleincludes: a primary windingand secondary windingswhich are formed spirally around the magnetic core; and a third layer Land a sixth layer Linterposed between a fourth layer Lof the primary windingand a second layer Lof the secondary windingand between a fifth layer Lof the primary windingand a seventh layer Lof the secondary winding

Electronic component including planar transformer

Semiconductor driving circuit module

Semiconductor element

An electronic componentincludes: a circuit board modulewhich is composed of a plurality of layers, and in which a primary circuitand secondary circuitsare each formed using wring patterns of a first layer Lto an eighth layer L; and a magnetic corewhich magnetically couples the primary circuitand the secondary circuits. The circuit board moduleincludes: cutout portionswhich are formed in a cutout shape from side edge portions toward an inner side and which position the magnetic coreat a predetermined attachment position in a state of housing the magnetic core; and widened portionswhich continue from the cutout portionsand are formed in a cutout shape from the side edge portions toward the inner side of the circuit board module, and which are formed on sides of the magnetic coreso as to be larger than a width Wfor housing of the cutout portions

Growing community of inventors

Saitama, Japan

Tomohiko Yoshino