Omron Corporation

Takayoshi Tawaragi

Takeo Nishikawa

Wataru Okada

Takanori Ishii

Aya Murata

Kenji Kobayashi

Satoshi Iwai

Kazumi Tsuchimichi

Eiichi Omura

Gun Eto

Mamoru Yoshida

Koji Fujita

A controller in a power conversion unit increases or decreases, based on a detected voltage value of a first flying capacitor, a value of a gate voltage to be applied to a gate terminal of a target switch to be controlled selectively from first to fourth switches in a first capacitor circuit to cause conduction between a drain terminal and a source terminal of the target switch, or changes a gradient of the gate voltage value. The controller increases or decreases, based on a detected voltage value of the second flying capacitor, a value of a gate voltage to be applied to a gate terminal of a target switch to be controlled selectively from fifth to eighth switches in a second capacitor circuit to cause conduction between a drain terminal and a source terminal of the target switch, or changes a gradient of the gate voltage value.

Power conversion device and control method

A power converter includes a DC capacitor circuit, a first capacitor circuit including a first flying capacitor, and a second capacitor circuit including a second flying capacitor. A controller increases or decreases a period for charging and discharging a first DC capacitor and a second DC capacitor based on a deviation of a detected voltage value of the first flying capacitor from a voltage command value and a deviation of a detected voltage value of the second flying capacitor from a voltage command value, and outputs AC power from a second output terminal connected to a node between a source terminal of a second switch and a drain terminal of a third switch in the first capacitor circuit and from a first output terminal connected to a node between a source terminal of a sixth switch and a drain terminal of a seventh switch in the second capacitor circuit.

Power conversion device, and control method

The disclosure reduces the size and cost of a power conditioner. A power conditioner including a DC/DC converter connected to a power supply device and an inverter connected to the DC/DC converter includes: a plus side wiring connecting the DC/DC converter and the inverter; a minus side wiring connecting the DC/DC converter and the inverter; a capacitor having one end connected to the plus side wiring and an other end connected to the minus side wiring; and a fuse provided on the minus side wiring, wherein the DC/DC converter has at least one switching element; the other end of the capacitor is connected to a first connection point provided on the minus side wiring on the DC/DC converter side with respect to the fuse; and the switching element is connected to a second connection point provided on the minus side wiring on the inverter side with respect to the fuse.

Power conditioner and power system

A heat dissipation structure of a semiconductor device is provided, the semiconductor device including: an electrical bonding surface electrically connected to a substrate; and a heat dissipation surface as an opposite side of the electrical bonding surface. The heat dissipation surface makes contact with a heat spreader via a conductive TIM while the heat spreader makes contact with a heat sink via an insulating TIM. A surface of the heat spreader facing the semiconductor device includes a recess part formed in at least one part in a vicinity of an outer periphery of the semiconductor device.

Heat dissipation structure of semiconductor device

An inverter circuit provided in a power conversion device includes a full-bridge inverter, and a short circuit part. The short circuit part includes switching elements and clamp elements connected to the switching elements. The clamp elements suppress application of an excessive voltage such as a surge voltage to the switching elements.

Growing community of inventors

Kitakatsuragi-gun, Japan

Takayoshi Tawaragi