Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hiroki Funato

Takashi Suga

Keisuke Fukumasu

Isao Hoda

Masayoshi Takahashi

Takayoshi Nakamura

Kinya Nakatsu

Ryuichi Saito

Makoto Torigoe

Hitoshi Taniguchi

Masahiro Toyama

Yoshiyuki Tsuchie

Aya Ohmae

Liang Shao

Jia Li

Isao Houda

Yuki Nakamura

Yutaka Uematsu

Hideyuki Sakamoto

Hideki Osaka

Yusaku Katsube

George Saikalis

Kouichi Uesaka

Yuji Sobu

Yutaka Okubo

Hua Zeng

Makato Torigoe

Taesung Kim

Satoshi Nakamura

Hitoshi Akiyama

Tsutomu Hara

Kohji Maki

Masaki Noda

Fusanori Nishikimi

Ayumu Hatanaka

Kenichiro Nakajima

Hitoshi Yokota

Mitsuhiro Masuda

Shinya Kawakita

Yuki Fujita

Umberto Paoletti

Yuta Numakura

Takeshi Kato

Hiroyuki Yamai

Yoichiro Furuta

Ryuji Kurihara

Kiyoto Matsushima

Kazushige Nakahara

A signal transmission circuit includes: a circuit board stored in a housing; a connector which is mounted on the circuit board and includes a first signal terminal and a first ground terminal; and an integrated circuit which is mounted on the circuit board and includes a second signal terminal and a second ground terminal. The first signal terminal and the second signal terminal are connected to each other by a signal wiring arranged on the circuit board. The first around terminal and the second ground terminal are connected to each other by a ground wiring arranged in a predetermined range including a portion immediately above or immediately below the signal wiring in the circuit board. At least a part of the ground wiring immediately above or immediately below the signal wiring has a high impedance structure formed to be wider than the signal wiring and narrower than a combined width of the first signal terminal and the first ground terminal.

Signal transmission circuit and electronic control device

A power conversion device including: a circuit board including a first ground constituting a ground of a first circuit and a second ground formed to be electrically separated from the first ground; a second circuit in which a joining portion is formed; a metal base plate provided between the second circuit and the circuit board and provided with an opening portion corresponding to the joining portion; and a housing that stores the circuit board, the second circuit, and the metal base plate and is electrically connected to the second ground of the circuit board and the metal base plate, in which the joining portion of the second circuit is disposed corresponding to the second ground via the opening portion of the metal base plate.

Power conversion device

An electronic control device including a circuit substrate having a signal wiring and a ground wiring; at least one connector having a signal conductor and a ground conductor respectively connected to the signal wiring and the ground wiring of the circuit substrate on one end side and extending on the other end side; a housing including an accommodating portion that accommodates the circuit substrate and the at least one connector, in which a radio wave path through which a leakage electromagnetic wave propagates from one end on the circuit substrate side toward the other end on the side opposite to the circuit substrate side of the at least one connector is formed in an internal space at the periphery of the at least one connector; and a leakage electromagnetic wave attenuating structure provided between the housing and the at least one connector; where the leakage electromagnetic wave attenuating structure includes a plurality of conductors that are arrayed along a direction in which the leakage electromagnetic wave propagates from the one end of the at least one connector, and attenuate the leakage electromagnetic wave propagating through the radio wave path.

Electronic control device

An object of the present invention is to provide a power conversion device capable of reducing an influence of electromagnetic noise propagating from a circuit body toward a drive circuit board. A power conversion deviceof the present invention includes a circuit bodythat converts a direct current into an alternating current, a drive circuit boardthat drives the circuit body, a base memberprovided between the circuit bodyand the drive circuit board, and a casethat houses the circuit bodyand the base member. The base memberincludes a first flow channel forming portionA that forms a flow channel spaceCbetween the circuit bodyand the base member, and a first extending portionBextending from the flow channel forming portionA and connected to an inner surface of the case

Electromagnetic shielding power conversion device

A filter circuit device includes: first and second core members forming first and second through holes, respectively; a first conductor passing through the first and second through holes; a second conductor passing through the first and second through holes; a capacitor; a first terminal configured to electrically connect the first conductor with the capacitor; and a second terminal configured to electrically connect the second conductor with the capacitor. The first conductor from the first through hole to the second through hole and the second conductor from the first through hole to the second through hole have an opposing part between the first conductor and the second conductor. The first terminal presses an opposite surface of the first conductor, so as to be in contact with the first conductor. The second terminal presses an opposite surface of the second conductor, so as to be in contact with the second conductor.

Power converter including filter circuit device to improve a noise suppression function

Since inductance due to wiring to a Y capacitor is large, it is necessary to arrange the Y capacitor near a bus bar, and there is no degree of freedom in arranging the Y capacitor. Directions of currents flowing through a positive electrode side wiringand a negative electrode side wiringin a multi-core cableare a directionfrom a bus bar positive electrode terminaltoward the Y capacitor positive electrode terminal, and a directionfrom a bus bar negative electrode terminaltoward the Y capacitor negative electrode terminal, respectively. On the other hand, a direction of a current flowing through a ground wiringis a directionfrom a Y capacitor ground terminaltoward a ground terminal. A magnetic flux generated by the currents flowing through the positive electrode side wiringand the negative electrode side wiringin the multi-core cableand a magnetic flux generated by the current flowing through the ground wiringin the multi-core cablecancel each other out, and the inductance can be kept small.

Filter device and power converter

A high voltage filter includes an anode bus bar, a cathode bus bar, a first capacitive element connected between the anode bus bar and a ground connector connected to a ground, a second capacitive element connected between the cathode bus bar and the ground connector, and a third capacitive element connected between the anode bus bar and the cathode bus bar. An anode terminal of the first capacitive element and a cathode terminal of the third capacitive element are arranged adjacent to each other, and a cathode terminal of the second capacitive element and an anode terminal of the third capacitive element are arranged adjacent to each other.

High voltage filter and power conversion device

Provided is a detector. The detector includes: one or more detection diodes configured to detect a change in an environment of a detection target; a Y capacitor including a plurality of capacitors separately disposed between one end of the detection diodes and a GND and between the other end of the detection diodes and the GND; and a rectifier circuit disposed at least between one end of the detection diodes and the GND or between the other end of the detection diodes and the GND, connected in series with the Y capacitor, and configured to transmit a common-mode current accompanying noise induced in the detection diodes to the GND and cut off a normal-mode loop current that flows between the plurality of capacitors and the detection diodes.

Detector and power conversion apparatus

A high-voltage noise filter of a power conversion device includes: a metal housing; an anode bus bar connecting anodes of a power source and a power module; a cathode bus bar connecting cathodes thereof; a first magnetic core having a through hole where the anode bus bar and the cathode bus bar pass through; an X capacitor having one end connected to the anode bus bar, and the other end connected to the cathode bus bar; a first Y capacitor having one end connected to the anode bus bar, and the other end grounded; a second Y capacitor having one end connected to the cathode bus bar, and the other end grounded; and a first cooling unit connected to the first magnetic core and the metal housing. The anode bus bar partly faces the first cooling unit, and the cathode bus bar partly faces the first cooling unit.

Power conversion device and high-voltage noise filter

To improve the performance of the voltage filter. Rather than reducing an area of a region surrounded by a closed loop formed in a voltage filterA, an induced electromotive force generated in the voltage filterA itself is reduced by forming a pair of a closed loop CA and a closed loop CB in which the directions of the generated induced electromotive forces are opposite to each other by making a wiring(anode wiring) intersect a wiring(cathode wiring).

Voltage filter and power conversion device

Provided is an electronic control unit, which includes a printed wiring board on which a semiconductor element is mounted, including a power supply pattern and a ground pattern which are formed on the printed wiring board and connected to the semiconductor element, at least one capacitance adjustment pattern which is formed on the printed wiring board, and a connection portion which is provided for each capacitance adjustment pattern and able to switch electrical connection between either the power supply pattern or the ground pattern and the capacitance adjustment pattern.

Electronic control device, vehicle, and method for manufacturing electronic control device

In some examples, an apparatus includes an inverter with a switching circuit. Furthermore, a first circuit has a first circuit ground and a second circuit has a second circuit ground. For example, the second circuit may be electrically connected to the switching circuit, and the second circuit ground may be electrically connected to the first circuit ground. A first capacitor may be electrically connected between the first circuit ground and a main ground. In addition, a second capacitor may be electrically connected between the second circuit ground and the main ground. Additionally, a first impedance of a first conductive path to the main ground may be greater than a second impedance of a second conductive path to the main ground. The first conductive path may include the first circuit ground and the first capacitor, and the second conductive path may include the second circuit ground and the second capacitor.

Electromagnetic interference suppression for vehicle inverter

An electric circuit device includes a noise generating circuit unit which generates noises, a housing which stores the noise generating circuit unit thereinside, is electrically earthed, and includes an opening, a control board which is provided with a connector to connect a wiring to an outside, a base plate which is disposed between the noise generating circuit unit and the control board to cover the opening of the housing, and a high impedance component which has impedance higher than the base plate against the noises. The base plate includes a first base plate which supports the control board, and a second base plate which is separated from the first base plate. The first base plate and the second base plate are disposed to interpose the high impedance component therebetween.

Electrical circuit device

Provided is a power conversion device capable of selectively suppressing harmonic noise in a frequency band and a machine equipped with the power conversion device. The power conversion device includes a switching element (), a switching signal generation unit () for generating a switching control signal for controlling the turning on/off of the switching element (), and a control unit (), and is characterized in that the switching control signal generation unit () generates the switching control signal including a combination of a pair of symmetrical pulse waveforms having on and off periods that are interchanged with respect to a repeated cycle.

Power conversion device and machine equipped with power conversion device

An electric power conversion device includes: an active circuit section emitting noises; an output-side filter circuit section; a chassis including a first space and a second space for housing the active circuit section and the filter circuit section respectively; and a base plate that is installed so as to cover at least the first space and is electrically connected to the chassis. Here, the chassis includes a first partition wall for partitioning the first space and the second space, the base plate is disposed so as to cover the first space, and includes a second partition wall along the first partition wall, and the second partition wall is disposed between the filter circuit section and the first partition wall in the first space.

Electric power conversion device

Growing community of inventors

Yokohama, Japan

Hiroki Funato