Load drive circuit for an electric load

• US 6,417,652 B1
• Filed: 04/04/2001
• Issued: 07/09/2002
• Est. Priority Date: 04/28/2000
• Status: Expired due to Fees

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Kabune, Hideki, Hattori, Hiroshi
• Primary Examiner(s): BERHANE, ADOLF D
• Application Number:
  US09/824,710
• Publication Number:
  US 20020021113A1
• Time in Patent Office: 461 Days
• Field of Search: 323/265, 323/268, 323/271, 307/147, 257/691, 257/723
• US Class Current: 323/268
• CPC Class Codes: H01L 2224/48 of an individual wire connector
• CPC Class Codes: H01L 25/072 the devices being arranged next to each other
• 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 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01005 Boron [B]
• CPC Class Codes: H01L 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H03K 17/122 in field-effect transistor switches
• CPC Class Codes: H03K 17/6871 the output circuit comprising more than one controlled field-effect transistor

Abstract

A load drive circuit for an electric load comprises a plurality of switching circuits connected in parallel with each other, a first wiring conductor pattern connecting one sides of the switching circuits to an external power side through a first connecting portion, and a second wiring conductor pattern connecting another sides of the switching circuits to a load side through a second connecting portion. The first connecting portion and the second connecting portion are disposed in the vicinity of one end and the other end of a parallel arrangement of the switching circuits, respectively. Current paths from the first connecting portion to the second connecting portion through the switching circuits, respectively, have substantially same resistances.

Claims

1. A load drive circuit for an electric load comprising:

a plurality of switching circuits connected in parallel with each other to drive the load;

a first wiring conductor pattern having a first width and a first thickness connecting one sides of the switching circuits to an external power side; and

a second wiring conductor pattern having a second width and a second thickness connecting another sides of the switching circuits to a load side, the first width and the second width being substantially equal, the first thickness and the second thickness further being substantially equal,

wherein the first wiring conductor pattern has a first connecting portion connected to the external power side and disposed in the vicinity of one end of a parallel arrangement of the switching circuits, and

wherein the second wiring conductor pattern has a second connecting portion connected to the load side and disposed in the vicinity of another end of the parallel arrangement of the switching circuits.

2. A load drive circuit for an electric load as in claim 1,

wherein current paths starting from the first connecting portion and reaching the second connecting portion through the switching circuits, respectively, have substantially same path length.

3. A load drive circuit for an electric load as in claim 1,

wherein current paths starting from the first connecting portion and reaching the second connecting portion through the switching circuits, respectively, have substantially same resistances.

4. The load drive circuit as in claim 1, wherein the switching circuits include respective power MOS transistors and constructed as intelligent power devices, respectively.