Inverter

• US 9,099,906 B2
• Filed: 07/06/2010
• Issued: 08/04/2015
• Est. Priority Date: 07/06/2010
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Tamura, Shizuri, Kanda, Mitsuhiko
• Primary Examiner(s): Desai, Naishadh
• Application Number:
  US13/808,171
• Publication Number:
  US 20130106255A1
• Time in Patent Office: 1,855 Days
• Field of Search: 310/68.D, 310/68.R, 310/68.C, 310/71, 310/89
• US Class Current: 1/1
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 24/73 Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/10253 Silicon [Si]
• CPC Class Codes: H01L 2924/10272 Silicon Carbide [SiC]
• CPC Class Codes: H01L 2924/10329 Gallium arsenide [GaAs]
• CPC Class Codes: H01L 2924/1033 Gallium nitride [GaN]
• CPC Class Codes: H01L 2924/1305 Bipolar Junction Transistor [BJT]
• CPC Class Codes: H01L 2924/13055 Insulated gate bipolar transistor [IGBT]
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02M 1/123 Suppression of common mode voltage or current
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

An inverter that drives a motor and a noise filter are arranged on a surface of a motor housing, and the inverter and the noise filter are integrated with the motor housing. The noise filter reduces a common-mode current generated by a switching operation of the inverter to flow out to a side of a three-phase power supply through the motor housing.

Claims

1. A system, comprising,

an inverter;

and

a noise filter that reduces an amount of common-mode current, which is generated by a switching operation of the inverter, which flows out through a motor housing to a side of an alternating current power supply,

wherein the inverter and the noise filter are formed on the motor housing,

the motor housing is directly connected to ground without an impedance element between the motor housing and the ground, and a potential of the motor housing is equal to a ground potential, and

the noise filter includes a capacitor in a current path between the motor housing and the inverter,

one terminal of the capacitor is electrically connected to the motor housing, and

another terminal of the capacitor is, in the noise filter, electrically connected to a path formed between an input terminal of the noise filter on the side of the alternating current power supply and an output terminal of the noise filter on a side of the inverter.

2. The system according to claim 1, wherein a shortcut path that returns a common-mode current, which is transmitted to the motor housing, to an inverter side is formed in the noise filter.

3. The system according to claim 1, wherein the noise filter is an AC filter connected to an alternating-current potential side of the inverter.

4. The system according to claim 1, wherein the noise filter is a DC filter connected to a direct-current potential side of the inverter.

5. The system according to claim 1, wherein the noise filter is integrated with the motor housing and includes a reactor that suppresses a common-mode current, which is returned to the inverter side through the capacitor, from flowing out to a power-supply side.

6. The system according to claim 1, wherein a switching element of the inverter is constituted by a wide bandgap semiconductor.

7. The system according to claim 1, wherein a normal-mode noise filter that blocks flowing-out of a normal-mode current is mounted on the inverter.