Hitachi Automotive Systems, Ltd.

Yuji Sobu

Hiroki Funato

Keisuke Fukumasu

Tatsuya Nakazawa

Jia Li

Hiroyuki Saito

Kenji Kubo

Hidenori Shinohara

Shintaro Tanaka

Yoshiharu Yamashita

Satoru Shigeta

Isao Hoda

Akira Ishii

Yutaka Okubo

Naoya Takahashi

Mikito Komatsu

Ryuji Kurihara

Atsushi Okabe

Takayuki Ouchi

A switching loss of a power conversion device is sufficiently reduced. A DC-DC converter includes a switching circuit that converts input first DC power into AC power, a transformer that performs voltage conversion of the AC power, and an output circuit that converts the AC power subjected to the voltage conversion by the transformer into second DC power. The control circuit that controls the DC-DC converter calculates a magnetic flux density value B of the transformer and controls a drive frequency of the switching circuit based on the calculated magnetic flux density value B.

Control device with magnetic flux density calculation

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

An object of the present invention is to improve the reliability of a power converter against electromagnetic noise. A power converter according to the present invention includes: a power semiconductor circuit unit; a DCDC converter circuit unit; a first drive circuit board that outputs a drive signal to the power semiconductor circuit unit; a second drive circuit board that outputs a drive signal to the DCDC converter circuit unit; and a control circuit board that outputs a first control signal for controlling the first drive circuit board and a second control signal for controlling the second drive circuit board, in which the control circuit board is arranged at a position facing the second drive circuit board with the power semiconductor circuit unit and the DCDC converter circuit unit interposed therebetween, the first drive circuit board is arranged to be substantially parallel to an array direction of the control circuit board and the second drive circuit board, and the first drive circuit board has a relay wiring that relays the second control signal output from the control circuit board to the second drive circuit board.

Power converter

To provide a further miniaturized and densified current detection device or a power conversion apparatus including the same. A current detection device or a power conversion apparatus according to the present invention includes: a plurality of conductors corresponding to currents of a plurality of phases; and a current sensor. The plurality of conductors is formed so as to have a conductor portion in which the currents flowing in the plurality of conductors, respectively, are substantially parallel. In a cross section in a direction perpendicular to a flow direction of the current of the conductor portion, the current sensor is arranged in a region sandwiched between the plurality of conductor portions, and outputs information on a current flowing in the conductor based on a combination of magnetic field vectors generated by the plurality of currents.

Current detection device including a current sensor to detect magnetic field vectors

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

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

To achieve reduction in size and reduction in cost of a DC-DC converter apparatus. Rectifier elements and are installed onto a metal base, and a drive circuit board is installed to an upper part of the rectifier element. Each terminal of the rectifier elements and is soldered to the drive circuit board. Three terminals of the rectifier elements are soldered, respectively, to a drive signal wiring pattern, a high-potential-side main current wiring pattern, and a low-potential-side main current wiring pattern of the board. A pair of output terminals of a transformer is connected to at least the pair of high-potential-side main current wiring patterns using high-potential-side metal conductors.

DC-DC converter apparatus including single drive circuit board arranged at predetermined interval from metal base

To effectively suppress radiation and mixture of noise superimposed on a power line into a connection detection line. A power conversion device includes a connector having a wiring line which transmits DC power; and a housing in which the connector is arranged. The connector has a connection detection wiring line which detects whether the connector is connected with an external circuit. An opening part which connects with the connector is formed in the housing. An annular core formed of a magnetic substance is inserted through the opening part. The annular core is an annular member formed with a through-hole. The wiring line and the connection detection wiring line are introduced into an inside of the housing through the through-hole of the annular core.

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Hitachinaka, Japan

Yuji Sobu