Daikin Industries, Ltd.

Panasonic Corporation

Hirotaka Doi

Hiroshi Doumae

Sumio Kagimura

Nobuyasu Hiraoka

Keito Kotera

Michiya Takezoe

Yoshitsugu Koyama

Takuji Koyama

Satoshi Yagi

Masaki Kouno

Masahiro Yamamoto

Reiji Kawashima

Shigeki Kamitani

Shinichi Ishizeki

Motonobu Ikeda

Tomoisa Taniguchi

Masaki Kono

Hirohito Maeda

Keisuke Shimatani

Hiroshi Dohmae

Masafumi Hashimoto

Toshiaki Sato

Hirotaka Saruwatari

Taichi Koshiji

Takahiro Matsui

Hiroshi Fuchikami

Yukihide Yamane

Yuuko Nakashita

Shougo Ohta

Miho Kurokawa

Shuuji Genda

Makoto Takayanagi

Hiroyuki Kondou

Yukio Akita

Kodai Okuzono

A noise reduction circuit includes: noise canceler circuitry configured to inject a compensation current into a power line and ground to reduce a common mode noise current that flows through the power line and the ground into a commercial power supply from a power converter with a switching element connected to the commercial power supply; and overcurrent inhibitor circuitry provided on a compensation current path through which the compensation current flows, the overcurrent inhibitor circuitry being configured to inhibit application of an overcurrent to the noise canceler circuitry.

Noise reduction circuit, power conversion device, and refrigeration apparatus

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 heat exchange unit includes a heat exchanger, a structure supporting the heat exchanger, an insulating member electrically insulating the heat exchanger from the structure, a compressor electrically connected to the heat exchanger and the structure, and a connection member attached to the heat exchanger. The connection member electrically connects the heat exchanger and the structure. The connection member is provided separately from a first conductive path that electrically connects the compressor and the heat exchanger, and a second conductive path that electrically connects the compressor and the structure.

Heat exchange unit

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

An inverter driver of an air conditioner drives an inverter of an actuator that actuates the air conditioner. The inverter driver includes a drive circuit outputting a drive signal to the inverter, a microcomputer controlling the drive circuit, a first mechanical relay connected to the drive circuit, and an inverter control power supply continually supplying power to the microcomputer. The first mechanical relay is capable of cutting off an inverter drive power supply of the drive circuit or cutting off the drive signal of the drive circuit. The first mechanical relay cuts off the inverter drive power supply of the drive circuit or the drive signal of the drive circuit when an abnormality in the air conditioner has been sensed and stopping the driving of the actuator has been requested.

Inverter driver of air conditioner

An inverter apparatus variably controls an operation frequency of an electric motor provided in a refrigerating device, and includes: a printed wiring board; a power device attached to one surface of the printed wiring board, the power device including a converter circuit and an inverter circuit; a reactor arranged on a side of the one surface of the printed wiring board, at least a part of the reactor being arranged within a plane projection area of the printed wiring board; and a cooler for cooling the power device and the reactor, the cooler being arranged such that the power device and the reactor are interposed between the cooler and the printed wiring board.

Inverter apparatus

An inverter device uses an inverter to convert DC voltage supplied from a rectifying component to AC voltage and applies the AC voltage to an inductive load. The inverter device includes a shunt resistor provided on a direct-current link interconnecting the rectifying component and the inverter, a first terminal passing current to the shunt resistor, a second terminal to which the current from the shunt resistor flows, and a printed board having a conductive pattern with first and second conductive pattern components joining the shunt resistor and the first and second terminals, respectively. The first conductive pattern component includes a first central region connecting right and left side ends of the shunt resistor to right and left side ends of the first terminal, and first right and left side protruding regions. A ratio of areas of the first left and right side protruding regions is 0.6 to 1.6.

Inverter device having shunt resistor and printed board with conductive pattern component joining shunt resistor and terminal

A module-terminal block connection structure includes: a printed wiring board; a terminal block which is disposed on one surface of the printed wiring board and is formed into a three-dimensional shape by a conductive material, the terminal block being fixed to the printed wiring board; a power module which is disposed on the other surface (rear surface) of the printed wiring board and includes an electric circuit and a press-fit type lead pin used as a circuit terminal; and a conductive portion which is electrically connected to the terminal block, includes a hole (through-hole) for press-inserting the lead pin thereinto, and is electrically connected to the power module while the lead pin is press-inserted into the hole.

Module-terminal block connection structure and connection method

A connecting member such as a terminal base is used in connection with a printed circuit board unit in which circuit elements such as a power module are mounted on a printed circuit board. The connecting member connects the circuit element of an electrical circuit including the printed circuit board, to an electrical wire. The connecting member includes a terminal connecting section to be directly connected to terminal pins of the circuit element; a wire connecting section to be connected to the electrical wire; and attachment sections for attaching the connecting member to the printed circuit board.

Connecting member of electrical circuit

A voltage smoothing circuit is configured to smooth a voltage outputted from a power supply portion. The voltage smoothing circuit includes first and second smoothing capacitors, a first balancing resistor, and a second conduction regulating portion. The first smoothing capacitor and the second smoothing capacitor are connected in series to each other and are connected in parallel to the power supply portion. The first balancing resistor is connected in parallel to the first smoothing capacitor. The second conduction regulating portion is connected on a current path in parallel with the second smoothing capacitor and conducts current in one direction on the current path in a case where a voltage equal to or greater than a second predetermined voltage has been applied.

Voltage smoothing circuit for smoothing voltage from power supply

When an abnormality occurs in a refrigeration cycle, the inverter motor provided in the air conditioner is stopped reliably and contacts of the main relay are prevented from degradation and fusion. A power circuitof the air conditioner includes a rectifier circuit RC, a capacitor C (smoothing unit), a main relayprovided on a current path between the rectifier circuit RC and the capacitor C, an inverter circuit, a microcomputer, and a delay circuit. The microcomputerhas an inverter circuit control unit, a main relay opening/closing control unit, a waveform forced cut-off unit, and a cut-off signal output unit. Where a high-pressure switch(abnormality detection unit) detects a high-pressure abnormality and outputs a high-pressure abnormality signal to the waveform forced cut-off unitwhen the main relayis in a closed state, the waveform forced cut-off unitelectrically cuts off the inverter circuit control unit, and the cut-off signal output unitoutputs a cut-off signal, which sets the main relayto the open state, to the main relayvia the delay circuit

Power circuit, and computer-readable recording medium storing a control program for power circuits

A solid-state imaging device includes a plurality of AD conversion units respectively provided in a plurality of columns and each configured to convert a pixel signal converted by unit pixels provided in an associated column into digital data of N bits, and a plurality of data storage units respectively provided in the columns. The data storage units each include N flip-flop circuits. The solid-state imaging device further includes data switching units each configured to switch between a first state in which the digital data converted by the AD conversion unit is stored in the data storage unit of the associated column, and a second state in which the N flip-flop circuits in each of the data storage units are serially connected.

Solid-state imaging device and imaging device

Two current threshold values are adopted, which are larger than the upper limit of current of an operating region. When a rotating speed is smaller than a speed threshold value, the current threshold value is adopted as a criterion to judge whether an input current to an inverter is abnormal, and when the rotating speed Rot is larger than that, the other current threshold value is adopted as the criterion.

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Osaka, Japan

Hirotaka Doi