Hitachi, Ltd.

Hitachi Haramachi Semi-conductor, Ltd.

Hitachi Haramachi Electronics Co., Ltd.

Other

Shoichi Ozeki

Koichi Suda

Koji Kawamoto

Hitoshi Ohura

Masahiro Iwamura

Noboru Akiyama

Nobuaki Miyakawa

Yoshiaki Yazawa

Kinya Mitsumoto

Minehiro Nemoto

Masayuki Wada

Masato Miura

Hitoshi Matsuzaki

Tomoyuki Utsumi

Kazuhiro Shiina

Kunihoro Nunomura

An insulated gate transistor comprising a first semiconductor region, a second semiconductor region includes plural portions, a third semiconductor region, a fourth semiconductor region, a first insulation layer, control electrodes, a first main electrode, and a second main electrode, wherein a metallic wiring layer is provided on the first main surface plane via an insulating layer, plural regions insulated from the first main electrode are provided through said first main electrode, and the metallic wiring layer is connected electrically to the control electrode through the insulating layer via the region insulated from the main electrode.

Insulated gate bipolar transistor decreasing the gate resistance

A driver circuit wherein a first switching element and a second switching element are totem-pole-connected, wherein the totem pole connection is connected at its one end, node and other end with a power source, an output to a load and a reference potential, respectively, wherein the first switching element is connected between the one end and the node, wherein the second switching element is connected between the node and the other end, and wherein a third switching element is connected between the one end of the totem pole connection and the control terminal of the first switching element.

Driver circuit, driver integrated circuit, and display device and

For a semiconductor circuit having one or more semiconductor devices, such as an IGBT, a turn-ON prevention circuit is provided for each device which prevents the device from turning ON during OFF times thereof, due to the presence of a transient voltage (dV/dt) across the main terminals of the device. In accordance with such a scheme, a MOSFET is connected between the insulated-gate electrode and emitter of the IGBT, and a capacitor, for example, is connected between the gate of the MOSFET and a sufficient electric potential to thereby effect a temporary turn-ON of the MOSFET to remove parasitic charge build-up in the IGBT before such charge build-up has reached a potential of the turn-ON threshold of the IGBT during OFF times of the IGBT. The capacitance element can be constituted by a MOSFET, namely, the capacitance across the gate-to-drain of an additional MOSFET. As a result, therefore, power consumption can be kept sufficiently small and the chip area required for implementing the circuit, such as, in a monolithic construction can be reduced. Further, the turn-ON prevention scheme can be applied to MOSFET devices rather than IGBTs.

Semiconductor circuit having turn-on prevention capability of switching

A switching circuit providing detection circuit for detecting a current which flows through a main P-channel MOSFET detection of a floating voltage dependent upon a power supply potential, a reference-voltage generating circuit for generating a reference voltage which is a floating voltage dependent upon the power supply potential and has a constant value independently of variations in power supply potential, a comparator circuit operated on a supply voltage which is a floating voltage dependent upon the power supply potential, for comparing a detected voltage from the detection circuit with the reference voltage from the reference-voltage generating means, to convert the detected voltage into a logic voltage signal (i.e., a bi-level voltage signal and a conversion circuit for converting the logic voltage outputted by the comparator circuit into a voltage measured from a ground potential.

High-side switch with overcurrent protecting circuit

A write circuit for a semiconductor storage device which comprises a data output stage constructed by a composite circuit including at least one MOS transistor logic circuit and bipolar transistor. The Mos transistor circuit operates in response to an input signal to control the on-off states of at least one of the bipolar transistors. The write circuit implements less power consumption.

Write circuit for use in semiconductor storage device

Growing community of inventors

Hitachi, Japan

Shoichi Ozeki