Electric Circuit Apparatus and Method for Producing Electric Circuit Apparatus

• US 20150189784A1
• Filed: 07/22/2013
• Published: 07/02/2015
• Est. Priority Date: 08/29/2012
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hirano, Satoshi, Namba, Akihiro, Ogata, Makoto, Tokuyama, Takeshi, Nakatsu, Kinya
• Application Number:
  US14/418,724
• Publication Number:
  US 20150189784A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23K 2101/38 Conductors
• CPC Class Codes: H01L 23/49562 for devices being provided for in H01L29/00
• CPC Class Codes: H01L 25/072 the devices being arranged next to each other
• CPC Class Codes: H01L 25/18 the devices being of types provided for in two or more different subgroups of the same main group of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N
• 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 2924/0001 Technical content checked by a classifier
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• 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 7/02 Arrangements of circuit components or wiring on supporting structure
• CPC Class Codes: H05K 7/1432 specially adapted for power drive units or power converters
• 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 7/14329 specially adapted for the configuration of power bus bars
• CPC Class Codes: Y10T 29/49149 by metal fusion bonding

Abstract

An electric circuit apparatus includes a power module (300) including a DC positive electrode branch terminal (315D) and a DC negative electrode branch terminal (319D), and a power board (700) which is configured to transfer a direct current and which includes a power board P bus bar and a power board N bus bar sealed by a resin member, which has an insulation property, in such a manner that a P terminal (701) and an N terminal (702) are exposed. The DC positive electrode branch terminal (315D) and the P terminal (701) are held by a flexion member (904) and are connected to each other via a metal joining member having a melting point lower than those of the both terminals. The DC negative electrode branch terminal (319D) and the N terminal (702) are connected to each other in a similar manner. Thus, a thermal influence on the resin member can be reduced and connection durability can be improved.

Claims

1. An electric circuit apparatus comprising:

an electric circuit component including a DC terminal;

a power board configured to transfer a direct current, the power board including a positive electrode plate and a negative electrode plate sealed by a resin sealing material, which has an insulation property, in such a manner that a connection terminal part is exposed; and

a flexion member which is connected via a metal joining member having a melting point lower than those of the DC terminal and the connection terminal part, and which holds the DC terminal and the connection terminal part.

2. The electric circuit apparatus according to claim 1, wherein

the electric circuit component is a power semiconductor module configured to convert a direct current into an alternating current,

the DC terminal includes a positive electrode-side terminal and a negative electrode-side terminal which is lined up with the positive electrode-side terminal,

the connection terminal part includes a first connection terminal part formed on the positive electrode plate and a second connection terminal part formed on the negative electrode plate,

the flexion member includes a first flexion member arranged over a leading end of each of the positive electrode terminal and the first connection terminal part connected to each other and a second flexion member arranged over a leading end of each of the negative electrode terminal and the second connection terminal part connected to each other, and

an insulating barrier provided between the positive electrode terminal and the negative electrode terminal in such a manner as to project compared to the first and second flexion members arranged at the leading ends thereof is further included.

3. The electric circuit apparatus according to claim 2, wherein

the insulating barrier is provided in such a manner as to be in contact with a side surface in a width direction of each of the positive electrode terminal and the negative electrode terminal,

a size in the width direction of the first flexion member is set smaller than a width of the positive electrode-side terminal, and

a size in the width direction of the second flexion member is set smaller than a width of the negative electrode-side terminal.

4. The electric circuit apparatus according to claim 1, wherein

the electric circuit component is first and second capacitors configured to smooth a direct voltage,

a positive electrode terminal of the first capacitor is lined up with a negative electrode terminal of the second capacitor,

the connection terminal part includes a first connection terminal part formed on the positive electrode plate and a second connection terminal part formed on the negative electrode plate,

the flexion member includes a first flexion member arranged over a leading end of each of the positive electrode terminal and the first connection terminal part connected to each other and a second flexion member arranged over a leading end of each of the negative electrode terminal and the second connection terminal part connected to each other, and

an insulating barrier provided between the positive electrode terminal and the negative electrode terminal in such a manner as to project compared to the first and second flexion members arranged at the leading ends thereof is further included.

5. The electric circuit apparatus according to claim 1, wherein a tapered surface is formed on a leading end of at least one of the DC terminal and the connection terminal part connected to each other.

6. The electric circuit apparatus according to claim 1, wherein

a recess part is formed on a surface, which faces the flexion member, of at least one of the DC terminal and the connection terminal part connected to each other, and

a protruded part to be engaged with the recess part is formed on a surface, which faces the recess part, of the flexion member.

7. A method for producing an electric circuit apparatus including an electric circuit component which includes a DC terminal, and a power board which is configured to transfer a direct current and which includes a positive electrode plate and a negative electrode plate sealed by a resin sealing material, which has an insulation property, in such a manner that a connection terminal part is exposed, the method comprising:

a first step in which a leading end part of the connection terminal part and a leading end part of the DC terminal are held integrally by a flexion member in a state in which a metal joining member having a melting point lower than those of the connection terminal part and the DC terminal is arranged therebetween; and

a second step in which the connection part and the terminal are connected to each other by melting the metal joining member and solidifying the metal joining member again.

8. The method for producing an electric circuit apparatus according to claim 7, wherein a plating layer including the metal joining member is formed on at least one of facing surfaces of the connection terminal part and the DC terminal.

9. The method for producing an electric circuit apparatus according to claim 7, wherein the metal joining member is a sheet-like metal joining member.

10. The method for producing an electric circuit apparatus according to claim 7, wherein the metal joining member is a paste-like metal joining member.