Hitachi Power Semiconductor Device, Ltd.

Kohhei Onda

Tetsuya Ishimaru

Mutsuhiro Mori

Junichi Sakano

Shinichi Kurita

Shigeru Sugayama

The semiconductor device has a first external electrode having an outer peripheral section, which has a circular shape in top plan view and which is to be attached to an alternator. On the first external electrode there mounted: a MOSFET chip; a control circuitry to which voltages at or a current flowing between a first main terminal and a second main terminal of the MOSFET chip is inputted and which generates, on the basis of the voltages or the current, a control signal applied to a gate of the MOSFET chip; and a capacitor for providing a power supply to the control circuitry. The semiconductor device further has a second external electrode disposed opposite to the first external electrode with respect to the MOSFET chip. An electrical connection is made between the first main terminal of the MOSFET chip and the first external electrode, and between the second main terminal of the MOSFET chip and the second external electrode.

Semiconductor device, and alternator and power conversion device which use same

A rectifier () includes a rectifying MOSFET () that performs synchronous rectification, a control circuit () that inputs a voltage across a pair of a positive-side main terminal TK and a negative-side main terminal TA of the rectifying MOSFET () to determine an ON or OFF state of the rectifying MOSFET () based on the inputted voltage, and a capacitor () that supplies power to the control circuit (). The control circuit () includes a blocking circuit () that inputs the voltage across the pair of main terminals of the rectifying MOSFET (), to block power supply to the control circuit () when the inputted voltage across the pair of main terminals is higher than or equal to a first voltage, and to unblock power supply to the control circuit () when the inputted voltage across the pair of main terminals is lower than the first voltage.

Synchronous rectifier and alternator using the same

A rectifier including an autonomous type synchronous-rectification MOSFET is provided, which prevents chattering and through-current caused by a malfunction when a noise is applied. The rectifier includes: a rectification MOSFET for performing synchronous rectification; a determination circuit configured to input a voltage between a pair of main terminals of the rectification MOSFET, and to determine whether the rectification MOSFET is in on or off state on the basis of the inputted voltage; and a gate drive circuit configured such that a gate of the rectification MOSFET is turned on and off by a comparison signal from the determination circuit, and such that a time required to boost a gate voltage when the rectification MOSFET is turned on is longer than a time required to lower the gate voltage when the rectification MOSFET is turned off.

Rectification device, alternator, and power conversion device

Provided is a semiconductor device including: a first external electrode which includes a circular outer peripheral portion; a MOSFET chip; a control circuit chip which receives voltages of a drain electrode and a source electrode of the MOSFET and supplies a signal to a gate electrode to control the MOSFET on the basis of the voltage; a second external electrode which is disposed on an opposite side of the first external electrode with respect to the MOSFET chip and includes an external terminal on a center axis of the circular outer peripheral portion of the first external electrode; and an isolation substrate which isolates the control circuit chip from the external electrode. The first external electrode, the drain electrode and the source electrode of the MOSFET chip, and the second external electrode are disposed to be overlapped in a direction of the center axis. The drain electrode of the MOSFET chip and the first external electrode are connected. The source electrode of the MOSFET chip and the second external electrode are connected.

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Tokyo, Japan

Kohhei Onda