Daikin Industries, Ltd.

Masaki Kouno

Masahiro Yamamoto

Reiji Kawashima

Hirotaka Doi

Hiroshi Hibino

Tomoisa Taniguchi

Masahide Fujiwara

Keisuke Ohta

Takayuki Fujita

Nobuki Kitano

Naoto Kobayashi

Nobuyasu Hiraoka

Keito Kotera

Ryou Matsuyama

Yukihide Yamane

Michihiro Nakagawa

Takeshi Ashida

Taku Itou

Hiroki Kojima

Akihiko Oguri

[Problem to be solved] To achieve adjustment of an electric line based on indexes set separately for harmonic components having different orders in a current in the electric line. [Solution] A power control system causes a device to adjust apparent power in an electric line, and the power control system includes a setting unit that sets an index regarding each adjustment for a harmonic component of a first order group in a current in the electric line, a harmonic component of a second order group higher in order than the first order group in the current in the electric line, and a fundamental component in the current in the electric line, and a control unit that controls each adjustment by the device based on the index set by the setting unit.

Power control system and device

A technology that can reduce the influence of variations in the reference potential of each current output device on the operation of multiple current output devices, when using the multiple current output devices to reduce the distortion of the load current, is provided. A plurality of active filterstoare configured to reduce distortion of a load current supplied from the AC power supplyto the load device, based on a detection signal output from the load current sensor, the detection signal relating to the distortion of the load current; and the signal transmitting unitconfigured to cause the plurality of active filterstoto acquire a signal relating to the distortion of the load current, to reduce influence due to variation of a standard potential of the plurality of active filtersto, based on the detection signal output from the load current sensor

Current distortion reduction apparatus

To achieve high density integration of components while securing an insulation distance between a bootstrap capacitor and an intelligent power module. In a printed wiring board, a region where a capacitor is mounted is located in a region where an intelligent power module is mounted. Therefore, the capacitor mounted on the printed wiring board is placed between the printed wiring board and the intelligent power module.

Inverter device including a bootstrap circuit

In a power converter, an inductance L of a reactor and a capacitance C of a capacitor satisfy a condition of the expression (1) below. In the power converter, a current-limiting circuit between an AC power source and the capacitor is unnecessary. Herein, &#x3b1;m ([A&#xb7;s]) is a value of a ratio of a maximum rated current squared time product to a maximum rated output current of diodes of a rectifier circuit, Pmax is a maximum power consumption of the motor, Vac is a voltage value of a three-phase AC voltage, and a value of a constant a is 4.3 

Power converter and air conditioner

A power conversion apparatus includes a rectifier circuit, an inverse conversion circuit, and a capacitor. The rectifier circuit rectifies alternating current power of the alternating current power supply. The inverse conversion circuit inversely converts a voltage Vdc rectified by the rectifier circuit into an alternating current voltage having a certain frequency and applies the alternating current voltage to a motor whose maximum power consumption Pmax is 2 kW or larger. The capacitor is provided between the rectifier circuit and the inverse conversion circuit and has a capacitance C that satisfies a condition of a following expression in relation to an alternating current voltage Vac of the alternating current power supply and the maximum power consumption Pmax. 

Power conversion apparatus and air-conditioning apparatus

A current source capable of generating a current of a first compensation portion for either or both reducing a harmonic current in an air conditioner or improving a fundamental power factor in the air conditioner is provided. If an excess of the current source is larger than a second compensation portion for either or both reducing a harmonic current in a power receiving path of a distribution board or improving a fundamental power factor in the power receiving path of the distribution board, a current obtained through superimposition of a current of a second compensation component and a current of the first compensation component is generated in the current source.

Active filter device, air conditioning device, and air conditioning system

A carrier generating unit applies a carrier that monotonically decreases to a switching control unit during either one of a first period that is a period immediately following a period in which a voltage command value is a value not more than a minimum value of the carrier, the voltage command value taking a first predetermined value larger than the minimum value of the carrier in the first period, and a second period that is a period immediately preceding a period in which the voltage command value is not less than a maximum value of the carrier, the voltage command value taking a second predetermined value smaller than the maximum value in the second period.

Power conversion apparatus

Growing community of inventors

Osaka, Japan

Masaki Kouno