Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi, Ltd.

Youhei Nishizawa

Kaname Sasaki

Yutaka Okubo

Yuki Fujita

Yusaku Katsube

Toshiya Satoh

Fusanori Nishikimi

Hideyo Suzuki

Ayumu Hatanaka

Masashi Kosuga

Akihiro Goto

Takeshi Seki

Ryuichi Niisaka

Atsunari Hamaguchi

Masataka Nagata

Tomotaka Naoi

A power conversion device includes a direct-current bus bar that transmits a direct current, a capacitor element for filter connected to the direct-current bus bar, and a magnetic core that has a through hole into which the direct-current bus bar is inserted and is configured by a single member. The through hole is disposed in the magnetic core to have a first inner diameter along a width direction of the direct-current bus bar and a second inner diameter orthogonal to the first inner diameter, and the first inner diameter is larger than the second inner diameter.

Power conversion device

A power conversion device includes: a power conversion circuit that converts DC power into AC power; a positive electrode bus bar and a negative electrode bus bar connected to the power conversion circuit; a capacitor connected to at least one of the positive electrode bus bar and the negative electrode bus bar; a base plate made of metal on which the capacitor is placed; and a housing in which the power conversion circuit, the capacitor, the base plate, the positive electrode bus bar, and the negative electrode bus bar are accommodated, and a refrigerant passage is formed, in which the positive electrode bus bar and the negative electrode bus bar are installed in the housing via a resin member having insulating property, and in which the base plate on which the capacitor is placed is installed in the housing, and a thermal resistance from the capacitor to the refrigerant passage is larger than a thermal resistance from the positive electrode bus bar and the negative electrode bus bar to the refrigerant passage.

Provided is a power converter that allows a reduction in EMC noise current flowing through a control circuit board. A power converterincludes a semiconductor module, a capacitor, a control circuit board, positive and negative-side bus barsconnecting the semiconductor moduleand the capacitor, a baseelectrically connected to a ground of the control circuit board, the control circuit boardbeing placed on the base, and an electrical conductorelectrically connected to the baseand extending in a stacking direction in which the baseand the control circuit boardare stacked. The positive and negative-side bus barsextend around the electrical conductorand are connected to the semiconductor module

Power converter

The inductance of a noise filter circuit is reduced, and an output is increased, whereby positive and negative electrode power supply side conductors each include a first and second conductor portions having a side surface and a main surface having an area larger than an area of the side surface. The first conductor portions are arranged on one surface of a base portion with an insulating member interposed therebetween. The second conductor portions penetrate through a core member in a state in which the main surfaces face each other. A width of a portion of the first conductor portion which is in contact with the insulating member in a direction perpendicular to current flow direction is larger than a width of a portion of the second conductor portion which is disposed within the core member in the direction perpendicular to current flow direction.

An object of the present invention is to ensure the reliability of a capacitor element by appropriately securing a heat path around the capacitor element. A power converter according to the present invention includes: a power semiconductor circuit unit that converts DC power into AC power; a capacitor element that smooths the DC power; a DC-side bus bar that transmits the DC power; a capacitor terminal that is connected to an electrode surface of the capacitor element and to the DC-side bus bar; and a case that forms a capacitor housing portion for housing the capacitor element, in which the DC-side bus bar has: a power supply-side terminal; a main body portion that is arranged at a position facing a bottom of the capacitor housing portion with the capacitor element interposed therebetween; and an extending member that is formed between the case and the capacitor element and formed from the main body portion toward the bottom of the capacitor housing portion, and that does not contact the electrode surface.

There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit, a capacitorfor smoothing DC power, a capacitorfor removing noise, and conductorsand. The conductorsandare connected to the capacitorsandwhen power side terminalsandare connected to an inverter circuit, and power source side terminalsandare connected to a battery. In the conductorsand, a parasitic inductance Lbetween capacitor terminalsandand capacitor terminalsandis larger than a parasitic inductance Lbetween capacitor terminalsandand the power side terminalsand

To improve reliability of a power conversion device with an efficient cooling structure. A power conversion device according to the present invention includes a power semiconductor module configured to convert power, a first capacitor configured to smooth the power, a conductor section forming a first power path between a power terminal and the first capacitor and a second power path between the first capacitor and the power semiconductor module, a noise filter section including a second capacitor that smooths power having a higher frequency than a frequency of the power smoothed by the first capacitor, and a cooling section forming a cooling surface, and the noise filter section is connected to the conductor section forming the first power path, and the conductor section forming the first power path is arranged in a space between the cooling surface and the noise filter section.

Power conversion device with efficient cooling structure

In a power conversion device according to the present invention, a capacitor module, includes a first capacitor element; a second capacitor element; a positive pole-side bus bar; and a negative pole-side bus bar disposed in a laminated state, in which the positive pole-side bus bar and the negative pole-side bus bar are laminated via an insulating member. The first capacitor element includes a first body portion, a first positive pole-side electrode, and a first negative pole-side electrode. The second capacitor element includes a second body portion, a second positive pole-side electrode, and a second negative pole-side electrode. The first capacitor element is disposed so that the first positive pole-side electrode assumes a position closer to the second negative pole-side electrode than to the second positive pole-side electrode and faces the second negative pole-side electrode; and a laminate portion formed with the positive pole-side bus bar and the negative pole-side bus bar continues up to a point over a space where the first positive pole-side electrode and the second negative pole-side electrode face each other.

Growing community of inventors

Hitachinaka, Japan

Youhei Nishizawa