Omron Corporation

Fuji Electric Co., Ltd.

Kesanobu Kuwabara

Makoto Ohashi

Yoshihiko Yamaguchi

Masayuki Suetomi

Isao Fujihata

Katsuji Mitsui

A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter () constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs a specific state transition of the DC/DC converter () after a change rate of a magnitude of a current flowing through a winding of a primary or secondary side of a transformer (TR) with respect to time reaches a value within a predetermined change rate range.

Bidirectional DC/DC converter

A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter () constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device in which a direction of a current flowing through a winding of a transformer (TR) is switched after a magnitude of the current flowing through the winding of the transformer (TR) reaches '0.'

Power conversion device

A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter () constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs a predetermined state transition of the DC/DC converter () after waiting for a load current value of a primary or secondary side of a transformer (TR) becomes a value within a predetermined current value range.

A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter () constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs predetermined state transition of the DC/DC converter () after waiting for a load current value of a secondary side of a transformer (TR) to be a value within a predetermined current value range.

A drive circuit drives LED groups each of which has a plurality of LEDs connected in series. The drive circuit includes nMOSFETs which drive the LED groups, current regulating circuits which determine drain currents of the nMOSFETs, and subtracters which control the current regulating circuits to keep the sum of the current values of adjacent two nMOSFETs constant. The LEDs can be switched on/off efficiently even when there are differences between forward voltages of the LEDs.

Growing community of inventors

Azumino, Japan

Kesanobu Kuwabara