Mounting structure of a switching element at a heat sink

• US 20040239278A1
• Filed: 05/28/2004
• Published: 12/02/2004
• Est. Priority Date: 05/28/2003
• Status: Abandoned Application

• Current Assignee: Toyoda Koki Kabushiki Kaisha
• Original Assignee: Toyoda Koki Kabushiki Kaisha
• Inventors: Watanabe, Yukihiro, Ushiroyama, Mitsuya, Kobayashi, Yukihiro
• Application Number:
  US10/855,638
• Publication Number:
  US 20040239278A1
• Time in Patent Office: Days
• US Class Current: 318/599
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H02P 6/04 Arrangements for controlling or regulating the speed or torque of more than one motor H02P6/10 takes precedence
• CPC Class Codes: H02P 6/08 Arrangements for controlling the speed or torque of a single motor H02P6/10, H02P6/28 take precedence

Abstract

An electronic control unit has a driving circuit for driving a motor by a PWM control, a heat sink provided at a substrate of the electronic control unit, at least one first switching element equipped to the driving circuit and switched on and off at a relatively high speed by the driving circuit, and at least one second switching element equipped to the driving circuit and switched on and off at a relatively low speed by the driving circuit. The at least one first switching element and the at least one second switching element are alternately arranged and fixed to the heat sink.

Claims

1. An electronic control unit comprising:

a driving circuit for driving a motor;

a heat sink provided at a substrate of the electronic control unit;

at least one first switch element equipped to the driving circuit and switched on and off at a relatively high speed by the driving circuit; and

at least one second switching element equipped to the driving circuit and switched on and off at a relatively low speed by the driving circuit,

wherein the at least one first switching element and the at least one second switching element are alternately arranged and fixed to the heat sinks.

2. An electronic control unit according to claim 1, wherein the heat sink has one surface near outside of the substrate and an other surface near a central portion of the substrate, the at least one it switching element is fixed to the one surface, and the at least one second switching element is fixed to the other surface.

3. An electronic control unit according to claim 1, wherein the heat sink has one surface near outside of the substrate and an other surface near a central portion of the substrate, the at least one first switching elements and the at least one second switching elements are alternately arranged at the one surface and the other surface of the heat sink.

4. An electronic control unit according to claim 1, wherein the at least one first switching element is fixed to the heat sink at a distant from other electrical components at the substrate of the electronic control unit.

5. An electronic control unit according to claim 1, wherein the driving circuit drives the motor by a PWM control.