Hitachi, Ltd.

Hitachi Astemo Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Consumer Electronics Co., Ltd.

Isao Hoda

Hiroki Funato

Hitoshi Akiyama

Masahiro Toyama

Jia Li

Yuki Nakamura

Hideyuki Sakamoto

Hitoshi Taniguchi

Takatoshi Shirosugi

Umberto Paoletti

Yutaka Uematsu

Masayoshi Takahashi

Masaki Noda

Yusaku Katsube

Fusanori Nishikimi

Shinichi Murakami

Aya Ohmae

Yuji Sobu

Yutaka Okubo

Hua Zeng

Eiji Ichikawa

Ryuji Kurihara

Tetsuya Ishida

An electronic control device includes a circuit board having a plurality of connectors for connection to an external apparatus, and a housing made of a conductive material and adapted to accommodate the circuit board therein. The housing has an opening corresponding to the connectors, and at least one of a first housing component and a second housing component which constitute the housing has a comb-blade-shaped portion for partitioning the opening for each of the connectors.

Electronic control device

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

An electronic control device includes: a housing accommodating a board on which an electronic component is mounted; and a guard pattern formed on an outer peripheral portion of the board. The guard pattern and a ground pattern of a circuit in the circuit board are connected to each other in a vicinity of an intermediate point of fixed positions where an upper portion of the housing and a lower portion of the housing are fixed to each other.

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

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

A power conversion apparatus PWCS includes a smoothing capacitance element Cxp connected between a positive terminal and a negative terminal of a power source and configured to smooth a voltage change superimposed on a DC voltage, a switching circuit SWC converting the DC voltage into an AC voltage, a first bus bar BSBconfigured to electrically connect between the positive terminal of the power source and a terminal TCxof the smoothing capacitance element Cxp, a second bus bar BSBconfigured to electrically connect between the negative terminal of the power source and a terminal TCxof the smoothing capacitance element Cxp, and a filtering capacitance elements Cand Celectrically connected between the first bus bar BSBand the second bus bar BSB. The first bus bar BSBand the second bus bar BSBinclude opposing portions and are disposed to allow the current to flow through the opposing portions in the same direction.

Bus bar structure and power conversion apparatus using the same

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

The present disclosure generally relates to a signal transmission path evaluation device and method for evaluating EMC resistance of a signal transmission path using a computer system. An operating device of the computer system is input with signal transmission line shape data, signal transmission line path data, signal transmission line shape dispersion data, and margin information for noise input of a communication device connected to the signal transmission line. Calculations are performed including an electric field or a magnetic field in a vicinity of the signal transmission line path from the signal transmission line path data, dispersion of the signal line transmission line shape via a random number, noise waveform at a communication device input from the electric field or the magnetic field in the vicinity of the signal transmission path, error occurrence determination, and error rate from plural time trial results. Information concerning the calculated error rate is output.

Signal line noise resistance evaluating method and its device

It is an object of the present invention to provide a power supplying apparatus, a power receiving apparatus, an electrical vehicle, a charging system, and a charging method, the power feeding apparatus improving reliability by suppressing any decrease in charging efficiency and making charging control communication more resistant to high-frequency noise of a switching element. A power supplying apparatus for feeding power to an external apparatus, wherein the power supplying apparatus is characterized in having a power conversion unit, a power supplying unit, a control unit, and a communication unit. The power conversion unit includes a power conversion switching element capable of changing the a switching waveform of the switching element. The power supplying unit supplies power to the external apparatus, the power being generated in the power conversion unit. The communication unit communicates with the external apparatus. The control unit conducts a control so as to adjust the switching waveform of the switching element in the power conversion unit during a period in which the communication unit communicates with the external apparatus.

Power supplying apparatus, power receiving apparatus, electrical vehicle, charging system, and charging method

An apparatus and method for inspecting the quality of a weld under test in a structure having a plurality of spaced apart welds. Two probes are placed on opposite sides of the structure so that a current path is formed through the weld under test. The probes are energized with alternating current at a known frequency. The magnetic flux generated from the current flow through the probes and at least one of the spaced apart welds is then measured and subsequently compared with magnetic flux data previously determined and representing weld quality.

Method and apparatus for inspecting weld quality

The present invention provides a method for providing an optimal wireless communication method according to a change in a wireless communication environment. When the reception status is degraded while an HD stream signal, which uses a first wireless method, is transmitted and received, the method scans channels for which radar wave monitoring is not required and switches the transmission/reception to a second wireless method using free channel A. The method further scans channels for which radar wave monitoring is required and, if free channel B has a bandwidth wider than that of channel A is found, monitors channel B and if channel B is not used by a radar wave, switches the channel from channel A to channel B.

Transceiver

In a receiving apparatus and a method for setting a receiving antenna thereof, for dissolving a problem of necessity of a large amount of time for channel search, since it needs a time for setting up the receiving antenna at each physical channel, in the channel search operation, including searching of receivable channels and also memorization of an optimal setup for each of the receiving channels, receiving conditions are obtained for all of the physical channels in each of the setups of receiving antenna, and this obtaining of the receiving condition is conducted on all of the setups of the receiving antenna. In that instance, a number of times of controlling the setup of receiving antenna is determined to be a number of combinations of the setups of receiving antenna, and thereby shortening the time necessary for the setup of the receiving antenna and the time necessary for channel preset.

Receiving apparatus and a method for setting a receiving antenna thereof

In a receiving apparatus equipped with a plurality of tuners, if a reception antenna is controlled in such a manner that a reception condition of a channel tuned by one tuner may become suitable, then a reception condition of the channel tuned by another tuner does not always become suitable. The receiving apparatus is provided with an antenna control unit which controls a reception antenna whose reception condition can be set, a first receiving unit, a second receiving unit, and a storage unit which stores thereinto tuning information such as a tuning channel, signal quality information, and a reception antenna setting condition. The receiving apparatus calculates a setting condition of the reception antenna capable of obtaining suitable receiving conditions in both the first and second receiving units by employing tuning information in a first channel and tuning information in a second channel.

Growing community of inventors

Tokyo, Japan

Isao Hoda