Shindengen Electric Manufacturing Company Limited

Yoshihiko Kikuchi

Yuji Morinaga

Atsushi Kyutoku

Hiroyuki Haga

Masanori Hayashi

Kenichi Suzuki

Kenichi Kubota

Haruo Watanabe

Yutaka Sekine

Yukihiro Nozaki

Masaki Oshima

Kenichi Zenta

A semiconductor deviceof an embodiment is provided, including an insulating substrate, conductive pattern parts, andformed on the insulating substrate, semiconductor switching partsand, and a bypass capacitor, the semiconductor switching partprovided on the conductive pattern part, the semiconductor switching partprovided on the conductive pattern part, the semiconductor switching parthaving a side Sand a side S, the semiconductor switching parthaving a side Sand a side S, an imaginary line Lextending along the side Sand an imaginary line Lextending along the side Sintersecting each other.

Semiconductor device having a bypass capacitor

A semiconductor deviceof an embodiment is provided, including an insulating substrate, conductive pattern parts, andformed on the insulating substrate, a GaN-HEMIdisposed on the conductive pattern part, and a GaN-HEMTdisposed on the conductive pattern part, wherein an imaginary line Lof the GaN-HEMTand an imaginary line Lof the GaN-HEMTintersect each other, a GaN gate electrodeof the GaN-HEMTis electrically connected to the conductive pattern partvia a metal wire, and the metal wireis perpendicular to a sideof the GaN-HEMTand a conductive pattern sideS of the conductive pattern part

Semiconductor device

A switching power supply; wherein a voltage detector is provided at the output of a power supply circuit and connected to the negative input of an error amplifier to amplify the error between detected voltage and reference voltage, the output of said amplifier is connected to the negative input of a first comparator and to the negative input of a second comparator through split resistors, a filter circuit is connected between a control switch and synchronous switch and the output of said filter circuit is connected to a first comparator and a second comparator, wherein said configuration constitues a control means to control the amplitude of the triangular waveform obtained through said filter circuit to be between an input level of said first comparator and an input of said second comparator, whereby the stability of the switching power supply is ensured without lowering the frequency band of said amplified error signal and stable output ripple characteristics can be materialized.

Switching power supply

A polyphase rectifying apparatus is disclosed, which substantially solves the instability of the single-phase rectifiers without adding a special circuit element, thereby balancing the input voltages of the single-phase rectifiers. The polyphase rectifying apparatus, used in a two or more-phase system, comprises a single-phase rectifier assigned to each phase, and having first and second input terminals, wherein the single-phase rectifiers of each phase are star-connected and the first input terminal of each single-phase rectifier is connected to the corresponding phase and the second input terminals of each of the single-phase rectifiers are connected to each other; and a converter assigned to each phase, wherein the output from the single-phase rectifier of the relevant phase is input into the corresponding converter. The single-phase rectifiers for all the phases are controlled by a common control signal. Preferably, the converters of all the phases are also controlled by a common control signal.

Polyphase rectifying apparatus having single-phase rectifiers controlled by common control signal

Growing community of inventors

Hanno, Japan

Yoshihiko Kikuchi