Omron Corporation

Advanced Power Technology Corporation

Kikusui Electronics Corporation

Masayuki Suetomi

Makoto Ohashi

Yoshihiko Yamaguchi

Isao Fujihata

Kesanobu Kuwabara

Katsuji Mitsui

Takeo Nishikawa

Masaaki Shimizu

Takashi Hyodo

Tatsumi Yamamoto

Noriyoshi Kikuchi

A technology capable of setting a leakage inductance to a predetermined value and enabling miniaturization is provided. In a transformer including a primary coil and a secondary coil which are coaxially provided, the primary coil includes a first primary coil portion and a second primary coil portion in series, the secondary coil includes a first secondary coil portion and a second secondary coil portion in series, the second primary coil portion and the second secondary coil portion are provided outside the first primary coil portion and the first secondary coil portion, and a degree of coupling between the second primary coil portion and the second secondary coil portion is set to be lower than a degree of coupling between the first primary coil portion and the first secondary coil portion.

Transformer and DC-DC converter

A low-voltage circuit in a bidirectional DC-DC converter converts output AC power from a high-voltage circuit to DC power to charge a smoothing reactor and discharge the smoothing reactor, and includes an active snubber circuit including switching elements and each having a backward diode and a snubber capacitor. The snubber capacitor of the active snubber circuit has its one end connected to a drain end of the switching elements, and has its other end connected to a node between a center tap of a high-frequency transformer and a smoothing reactor.

Bidirectional DC-DC converter, power conditioner, and distributed power system

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.

An AC power supply apparatus for obtaining sampled data required for the FFT (Fast Fourier Transformation) by an A/D converter. Since a clock pulse train for forming an output voltage (power supply output) is used as sample clock pulses, sampled data associated with exactly one period can be obtained. This eliminates the need for the window processing. This makes it possible to provide a low cost, error-free apparatus.

Growing community of inventors

Yokohama, Japan

Masayuki Suetomi