Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Daisuke Fukuda

Keiji Akamatsu

Takaaki Norisada

Sohei Okamoto

Goh Yamada

Takehiro Yano

Tetsu Nagano

A control unit controls the amplitude of at least either an output voltage or an output current by shifting at least either a first on time or a second on time.

Power conversion apparatus including a transformer, an invertor circuit and a plurality of switching devices controlled by a controller

A power conversion apparatus that switches, with a relay unit, from a disconnected state to a connected state between a connector and at least one of a commercial power system and a load while a switching device is in an off state.

Power conversion apparatus

A power conversion apparatus includes an inductor inserted between a secondary winding and a switching device, and an auxiliary switching device inserted between the secondary winding and the switching device in parallel to the inductor. The auxiliary switching device is in an off state in a power supply mode in which an output voltage and an output current of a connector have the same polarity. The auxiliary switching device is in an on state in a power regeneration mode in which the output voltage and the output current of the connector have different polarities.

Power conversion apparatus having a switching circuit unit that includes a switching device and an auxiliary switching device

An electric power converter includes a bridge circuit, a transformer, a rectifier circuit, and a smoothing circuit. The rectifier circuit includes a first secondary-side diode disposed in a first current path extending between one end of a secondary winding and a first terminal of the smoothing circuit, a second secondary-side diode disposed in a second current path extending between the other end of the secondary winding and the first terminal of the smoothing circuit, a third secondary-side diode, a fourth secondary-side diode, a first secondary-side switching element, and a second secondary-side switching element. The first secondary-side switching element and the second secondary-side switching element are connected in common to a first node at which the first current path and the second current path are connected to each other.

Switching power supply including a rectifier circuit having switching elements, and electric power converter

There are provided upper and lower switching elementsU toW andU toW for energizing motor drive windingsU toW, a control circuitthat starts outputting a control signal for energization based on an energization instruction, pre-drive circuitsU toW andU toW for controlling ON/OFF of the upper and lower switching elements based on the control signal, and short circuit detection circuitsU toW for detecting short circuits in a nodebetween the upper and lower switching elements to higher-potential and lower-potential power sources based on the control signal and a voltage of the node. The short circuit detection circuits are controlled to detect a short circuit in the node to the lower-potential power source with all the upper switching elements turned ON and all the lower switching elements turned OFF and to detect a short circuit in the node to the higher-potential power source with all the upper switching elements turned OFF and all the lower switching elements turned ON, in a state where the motor drive windings are not energized. It is possible to prevent a situation in which a short circuit cannot be detected depending on a resistance component of a drive target.

Growing community of inventors

Hyogo, Japan

Daisuke Fukuda