Power conversion device

• US 9,906,158 B2
• Filed: 06/17/2015
• Issued: 02/27/2018
• Est. Priority Date: 07/29/2014
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Fukumasu, Keisuke, Takahashi, Masayoshi, Sakamoto, Hideyuki
• Primary Examiner(s): Thompson, Timothy
• Assistant Examiner(s): EGOAVIL, GUILLERMO J
• Application Number:
  US15/321,238
• Publication Number:
  US 20170194872A1
• Time in Patent Office: 986 Days
• Field of Search: 3122231, 361699, 361715, 361752, 361818, 363141
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02M 7/537 using semiconductor devices only, e.g. single switched pulse inverters
• CPC Class Codes: H05K 5/0017 with operator interface units
• CPC Class Codes: H05K 5/0026 provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units
• CPC Class Codes: H05K 5/04 Metal casings
• CPC Class Codes: H05K 7/14322 wherein the control and power circuits of a power converter are arranged within the same casing
• CPC Class Codes: H05K 9/0022 of components mounted on printed circuit boards [PCB] shields integrated within component packages H01L23/552; shields integrated within PCB H05K1/0218

Abstract

A power conversion device possesses a capacitor module, a power module, a circuit board on which a control circuit is mounted and which has a ground layer formed in a control circuit mounting region, a noise shielding plate, and a metal housing. The circuit board is above the capacitor module, and the noise shielding plate faces the control circuit mounting region between the circuit board and the capacitor module, in which the noise shielding plate has a plurality of connection parts to be electrically connected to the metal housing. A first end part on the power module side of the noise shielding plate is on the power module side more than a second end part on the power module side of the ground layer, and the connection part which is the closest to the first end part is provided on the power module side more than the second end part.

Claims

1. A power conversion device comprising:

a capacitor module that smooths a DC current from a DC power source;

a power module that converts the DC current into an AC current based on a drive signal from a drive circuit;

a circuit board that extends up to above the power module and includes a ground layer in a control circuit mounting region of the circuit board, wherein the control circuit mounting region faces the power module;

a noise shielding plate that extends to the control circuit mounting region and includes an opening for wiring that connects together the power module and the drive circuit, wherein the noise shield plate shields noise from the power module; and

a metal housing in which the capacitor module and the power module are contained side by side, the circuit board is contained above the capacitor module, and the noise shielding plate is contained at a position which faces the control circuit mounting region between the circuit board and the capacitor module,

wherein the noise shielding plate has a plurality of connection parts that are electrically connected to the metal housing,

a first end part on a power module side of the noise shielding plate is provided on the power module more than a second end part on the power module side of the ground layer and a particular connection part from the plurality of connection parts that is closest to the first end part among the plurality of connection parts is provided on the power module more than the second end part, in planar view viewed from above a containing part of the metal housing, and

an edge on a capacitor modules side of the opening is the first end part.