Hitachi Power Semiconductor Device, Ltd.

Satoshi Iesaka

Kenji Sakurai

Tomoya Taniguchi

The upper arm drive circuit for controlling the drive of an upper arm switching element of the power conversion device includes: an upper arm gate voltage output wiring connected to a gate of the upper arm switching element; a first upper arm drive circuit reference potential wiring; an upper arm gate voltage reference potential wiring connected to an inverter output of the power conversion device; and a control circuit of upper arm drive circuit reference potential wiring potential for controlling the potential of the first upper arm drive circuit reference potential wiring to a potential lower than a reference potential when a potential of the inverter output is equal to a predefined potential that is lower than the reference potential or lower. The first upper arm drive circuit reference potential wiring is connected to the reference potential via the control circuit of upper arm drive circuit reference potential wiring potential.

Upper arm drive circuit, drive circuit of power conversion device, and power conversion device

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

Satoshi Iesaka