Electronic circuit structure, power supply apparatus, power supply system, and electronic apparatus

• US 7,548,411 B2
• Filed: 10/28/2005
• Issued: 06/16/2009
• Est. Priority Date: 10/29/2004
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Nakajima, Kazunori, Yamamura, Hideho, Maru, Naoki, Nisisu, Koji, Oomae, Shigeo
• Primary Examiner(s): Norris; Jeremy C
• Assistant Examiner(s): NGUYEN, HOA CAO
• Application Number:
  US11/260,210
• Publication Number:
  US 20060092599A1
• Time in Patent Office: 1,327 Days
• Field of Search: 361/611, 361/775, 361/637, 361/719, 361/624, 361/639, 361/648, 361/650, 174/70.B, 174/99.B, 174/71.B, 174/72.B, 174/68.2 B, 174/88.B
• US Class Current: 361/611
• CPC Class Codes: H05K 1/0263 High current adaptations, e.g. printed high current conductors or using auxiliary non-printed means; Fine and coarse circuit patterns on one circuit board H05K1/0293 takes precedence
• CPC Class Codes: H05K 2201/10272 Busbars, i.e. thick metal bars mounted on the printed circuit board [PCB] as high-current conductors

Abstract

This invention prevents a deterioration of efficiency of a power supply apparatus due to a semiconductor power supply voltage drop, prevents an increase in wasted power, and prevents erroneous operations due to feeder wire voltage drop.

In the mounting structure of electronic circuits having a plurality of busbars as current paths on a printed circuit board, the plurality of busbars have almost parallel portions spaced a predetermined distance apart; a span of the parallel portions of the plurality of busbars is greater than the predetermined distance; and in the parallel portions of the plurality of busbars, the plurality of busbars are connected by a wiring pattern. In the switching power supply apparatus built on a printed circuit board, with its output voltage of less than 2 V and its output current of more than 100 A, a means is provided for making the power efficiency higher than 70%.

Claims

1. A mounting structure of electronic circuits having a plurality of busbars as current paths on a printed circuit board,

wherein the plurality of busbars have almost parallel portions spaced a predetermined distance apart;

wherein a span of the parallel portions of the plurality of busbars is greater than the predetermined distance;

wherein in the parallel portions of the plurality of busbars, the plurality of busbars are connected by a wide wiring pattern whose width is larger than its length with respect to a direction along which a current flows, and

wherein the wide wiring pattern, which connects a pair of first and second busbars that are adjacently located, is arranged such that its width is larger than its length with respect to a direction along which a current flows from the first busbar to the second busbar.

2. An electronic circuit mounting structure according to claim 1, wherein the wide wiring pattern is divided into a pair of first and second wiring patterns respectively located at the first and second busbars, and further comprising a semiconductor device connected to each of the first and second wiring patterns.

3. The mounting structure of electronic circuits according to claim 1, wherein each of the busbars includes a metal plate having a plurality of pin terminals, each of the pin terminal being arranged for inserting into a through-hole for connection with the printed circuit board.

4. A switching power supply apparatus built on a printed circuit board, comprising means for making a power efficiency higher than 70%, wherein said means comprising:

a plurality of busbars as current paths on the printed circuit board;

wherein the plurality of busbars have almost parallel portions spaced a predetermined distance apart;

wherein a span of the parallel portions of the plurality of busbars is greater than the predetermined distance;

wherein in the parallel portions of the plurality of busbars, the plurality of busbars are connected by a wide wiring pattern whose width is larger than its length with respect to a direction along which a current flows,

wherein the wide wiring pattern, which connects a pair of first and second busbars that are adjacently located, is arranged such that its width is larger than its length with respect to a direction along which a current flows from the first busbar to the second busbar,

wherein its output voltage is less than 2 V and its output current is more than 100 A.

5. A switching power supply apparatus according to 4, wherein the wide wiring pattern is divided into a pair of first, and second wiring patterns respectively located at the first and second busbars, and further comprising a semiconductor device connected to each of the first and second wiring patterns.

6. The switching power supply apparatus according to claim 4, wherein each of the busbars includes a metal plate having a plurality of pin terminals, each of the pin terminals being arranged for insertion into a through-hole for connection with the printed circuit board.