Hitachi Power Semiconductor Device, Ltd.

Tomoya Taniguchi

Kenji Sakurai

Satoshi Iesaka

The upper arm drive circuit for controlling drive of the upper arm switching element of the power conversion device includes: a capacitor disposed between a gate of the upper switching element and the output terminal of the power conversion device; a reverse current prevention circuit that is disposed between a power supply of the power conversion device and the capacitor, and that makes a current flow from a first terminal side of the reverse current prevention circuit connected to the power supply side to a second terminal side of the reverse current prevention circuit connected to the capacitor side and prevents a reverse current from flowing from the second terminal side to the first terminal side; and a switching element for capacitor charging that is turned ON in synchronization with a command signal that turns the upper arm switching element ON.

Upper arm drive circuit having a reverse current prevention circuit disposed between a power supply of a power conversion device and a first capacitor and control method thereof

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Hitachi, Japan

Tomoya Taniguchi