CN114566821A

CN114566821A - Lead terminal and electronic module

Info

Publication number: CN114566821A
Application number: CN202111362777.9A
Authority: CN
Inventors: 神山悦宏; 田中智大
Original assignee: Shindengen Electric Manufacturing Co Ltd
Current assignee: Shindengen Electric Manufacturing Co Ltd
Priority date: 2020-11-27
Filing date: 2021-11-17
Publication date: 2022-05-31

Abstract

The invention provides a lead terminal which can improve reliability and is easy to miniaturize. The lead terminal (GND) according to the present invention is characterized by comprising: a first connection part (21) connected to the first connection target part; a base portion (22) connected to the first connection portion (21); a plurality of arm sections (23U, 23V, 23W) that are connected to the base section (22) after branching; and a plurality of second connection parts 24U, 24V, 24W provided at the tip end parts of the plurality of arm parts 23U, 23V, 23W, respectively, and connected to the plurality of second connection target parts 10U, 10V, 10W, respectively, wherein the inductances from the first connection part 21 to the plurality of second connection parts 24U, 24V, 24W are equalized.

Description

Lead terminal and electronic module

Technical Field

The invention relates to a lead terminal and an electronic module.

Background

Conventionally, an electronic module is known which converts dc power input from a dc power supply into ac power and outputs the ac power (see, for example, patent document 1). In the electronic module described in patent document 1, a first phase region constituting a circuit connected to a first motor terminal, a second phase region constituting a circuit connected to a second motor terminal, and a third phase region constituting a circuit connected to a third motor terminal are formed on a substrate, respectively, and a wiring portion is provided on the substrate. One ground bus bar is provided on the substrate along the long side of the substrate. In each of the first phase region, the second phase region and the third phase region, there are provided a first switching element, a second switching element connected in series with the first switching element, and a third switching element connected to a connection point of the first switching element and the second switching element. The three third switching elements are connected to the ground bus via Clip leads (Clip-leads), wiring on the substrate, and shunt resistors, respectively. A ground terminal connected to the ground bus is provided at a central position in the longitudinal direction of the ground bus.

[ Prior Art document ]

[ patent document 1 ] Japanese patent laid-open No. 2016-197985

In the electronic module described in patent document 1, the three third switching elements are connected to the ground bus bar via the ground terminal (lead terminal), the wiring on the substrate, and the shunt resistor, respectively, and the ground terminal is provided at the center in the longitudinal direction of the ground bus bar. As a result, the wiring length from the external connection portion of the ground terminal to the connection portion with the shunt resistor in the ground bus varies from phase to phase, and the inductance varies from phase to phase, which makes it more susceptible to switching noise from other phases. In addition, in the electronic module described in patent document 1, it is necessary to reserve an area of the ground bus bar for a default value on the substrate, and therefore, there is also a problem that it is difficult to miniaturize the electronic module.

In view of the above problems, an object of the present invention is to provide a lead terminal which can improve reliability when applied to an electronic module and can downsize the electronic module. In addition, the invention also provides an electronic module using the lead terminal.

Disclosure of Invention

The lead terminal according to the present invention is characterized by comprising: a first connection portion (for example, the external connection portion 21 in the first embodiment) connected to the first connection target portion; a base portion connected to the first connection portion; a plurality of arm portions branched and connected from the base portion; and a plurality of second connection portions (for example,

inner connection portions

24U, 24V, 24W in the first embodiment) that are provided at the distal end portions of the plurality of arm portions, respectively, and are connected to a plurality of second connection target portions (10V, 10W), respectively, wherein inductances from the first connection portions to the plurality of second connection portions are equalized.

In addition, an electronic module according to the present invention includes: a substrate; and the lead terminals, wherein the plurality of second connection object portions are provided on the substrate.

Effects of the invention

According to the lead terminal and the electronic module of the present invention, since the inductances from the first connection portions to the plurality of second connection portions are equalized, when the lead terminal is mounted on the electronic module, the lead terminal is less likely to be affected by switching noise from the other second connection portions and the arm portions connected to the other second connection portions. This prevents a malfunction such as erroneous switching on at an unintended time point, thereby improving reliability.

Further, according to the lead terminal and the electronic module of the present invention, since they include: a first connection part connected to the first connection target part; a base portion connected to the first connection portion; a plurality of arm portions branched and connected from the base portion; and a plurality of second connection portions provided at the distal end portions of the plurality of arm portions, respectively, and connected to the plurality of second connection target portions, respectively, so that the lead terminals can be directly connected to the wiring on the board via the base portion, the arm portions, and the second connection portions by the first connection portions when the lead terminals are mounted on the electronic module. Thus, it is not necessary to provide wiring on a substrate such as a ground bus as in patent document 1, and the installation area is reduced to reduce the size of the electronic module.

Drawings

Fig. 1 is a perspective view of an electronic module 1 according to a first embodiment, in which (a) is an upper perspective view of the electronic module 1 and (b) is a perspective view of the electronic module 1 with its lower side facing upward.

Fig. 2 is a plan view for explaining the electronic module 1 according to the first embodiment.

Fig. 3 is a plan view showing the arrangement of the wiring, the switching elements, and the connection terminals on the circuit board of the electronic module 1 according to the first embodiment.

Fig. 4 is a plan view showing the relationship between the electronic module 1 and the ground terminal GND according to the first embodiment.

Fig. 5 is a diagram showing the ground terminal GND of the first embodiment, in which (a) is a plan view of the ground terminal GND and (b) is an upper perspective view of the ground terminal GND.

Fig. 6 is a circuit diagram showing a circuit configuration of the electronic module 1 according to the first embodiment.

Fig. 7 is a plan view illustrating the relationship between the electronic module 2 according to the second embodiment and the ground terminal GND 2.

Fig. 8 is a diagram showing the ground terminal GND2 of the second embodiment, in which (a) is a top view of the ground terminal GND2 and (b) is a top perspective view of the ground terminal GND 2.

Fig. 9 is a plan view for explaining the electronic module 3 according to the third embodiment.

Fig. 10 is a diagram showing the ground terminal GND3 of the third embodiment, in which (a) is a top view of the ground terminal GND3 and (b) is a top perspective view of the ground terminal GND 3.

Fig. 11 is a diagram showing the ground terminal GND4 of the first modification, in which (a) is a top view of the ground terminal GND4 and (b) is a lower perspective view of the ground terminal GND 4.

Fig. 12 is a diagram showing the ground terminal GND5 according to the second modification, and (a) is a top view of the ground terminal GND5, and (b) is a lower perspective view of the ground terminal GND 5.

Fig. 13 is a diagram showing the ground terminal GND6 of the third modification, and (a) is a plan view of the ground terminal GND6 and (b) is a lower perspective view of the ground terminal GND 6.

Fig. 14 is a diagram showing the ground terminal GND7 of the fourth modification, in which (a) is a top view of the ground terminal GND7 and (b) is a lower perspective view of the ground terminal GND 7.

Detailed Description

Hereinafter, the lead terminal and the electronic module according to the present invention will be described with reference to the drawings. The drawings are schematic drawings, and do not necessarily reflect actual dimensions. The embodiments described below do not limit the inventions described in the claims. All of the elements and combinations described in the embodiments are not essential to the solution of the present invention. In the respective embodiments, when the same configurations and elements (including not exactly the same configurations and elements) such as the basic configurations, features, and functions are described, the same reference numerals are used in the embodiments and the redundant description is omitted.

[ first embodiment ] to provide a liquid crystal display device

The electronic module 1 according to the first embodiment is an electronic module for controlling electric power supplied from a power supply to a three-phase motor. As shown in fig. 2 and 3, the electronic module 1 includes: the liquid crystal display device includes a substrate X, three first switching elements Q1 to Q3, three second switching elements Q4 to Q6, three third switching elements Q7 to Q9, three first connection terminals CL1 to CL3, three second connection terminals CL4 to CL6, three third connection terminals CL7 to CL9, three fourth connection terminals CL10 to CL12, three fifth connection terminals CL13 to CL15, three sixth connection terminals CL16 to CL18, three shunt resistors R1 to R3, a thermistor RT, a power supply terminal VCC, three motor terminals U, V, W, a ground terminal GND, a plurality of signal terminals 30, and a sealing member a. As shown in fig. 1, the electronic module 1 is sealed with a sealing member a except for a portion of each terminal on the side of the external connection portion connected to another substrate or the like, and a metal plate 11 on the back surface of the substrate X. In the first embodiment, a description will be given of a mode in which the present invention is applied to the ground terminal GND as an example of the lead terminal of the present invention.

The substrate X is an insulating substrate such as a ceramic substrate. The substrate X is a rectangular substrate having two long sides (hereinafter, referred to as a first side X1 and a second side X2) facing each other and two short sides (hereinafter, referred to as a third side X3 and a fourth side X4) facing each other. A plurality of wiring portions formed by attaching a metal plate are provided on one surface (hereinafter referred to as a front surface S) of the substrate X, and a metal plate 11 for heat dissipation is attached on the other surface (rear surface) of the substrate X. Specifically, on the surface S of the substrate X, at a position on the second side X2 side, a rectangular power supply wiring portion 12 is provided which extends from the vicinity of the third side X3 to the vicinity of the fourth side X4 along the second side X2. The power wiring portion 12 has an L-shaped portion extending to the first side X1 side and having an end portion side extending to the fourth side X4 side along the first side X1 at a position between the first gate wiring portion 16V and the output wiring portion 14W, which will be described later.

Three

central wiring portions

13U, 13V, and 13W, three first

gate wiring portions

16U, 16V, and 16W, and three

output wiring portions

14U, 14V, and 14W are provided on the surface S of the substrate X at positions on the first side X1 side adjacent to the power supply wiring portion 12. The central wiring portion 13U has an L-shape extending from the second side X2 side to the first side X1 side and from the end portion side to the third side X3 side, and is provided at a position adjacent to the third side X3. Each of the

central line portions

13V and 13W has an L-shape extending from the second side X2 to the first side X1 and extending from the end portion to the fourth side X4. The center wiring portion 13W is provided at a position adjacent to the fourth side X4. The central wiring portion 13V is provided at a substantially central position in the longitudinal direction of the substrate X.

The three first

gate wiring portions

16U, 16V, and 16W each have a rectangular shape extending from the second side X2 side to the first side X1 side. The first gate wiring portion 16U is provided at a position adjacent to the third side X3 and the central wiring portion 13U, and is formed in a rectangular shape as a whole in combination with the L-shaped central wiring portion 13U. The first gate wiring portion 16W is provided at a position adjacent to the fourth side X4 and the central wiring portion 13W, and has an overall rectangular shape when combined with the L-shaped central wiring portion 13W. The first gate wiring portion 16V is provided at a position adjacent to the center wiring portion 13V, and forms a rectangular shape as a whole when combined with the L-shaped center wiring portion 13V.

The three

output wiring portions

14U, 14V, and 14W each have a rectangular shape extending from the second side X2 side to the first side X1 side. The two

output wiring portions

14U, 14V are provided at positions between the two

central wiring portions

13U, 13V, and are adjacent to each other. The output wiring portion 14U is provided at a position adjacent to the center wiring portion 13U, and the output wiring portion 14V is provided at a position adjacent to the center wiring portion 13V. The output line portion 14W is provided adjacent to the center line portion 13W at a position between the two

center line portions

13V and 13W.

Three second

gate wiring portions

17U, 17V, 17W, three

source wiring portions

15U, 15V, 15W, three

gate wiring portions

18U, 18V, 18W, and three

ground wiring portions

10U, 10V, 10W are provided on the surface S of the substrate X at positions on the first side X1 side adjacent to the

center wiring portions

13U, 13V, 13W and the

output wiring portions

14U, 14V, 14W. The second gate wiring portion 17U is provided at a position adjacent to the third side X3, extends from the central wiring portion 13U side to the first side X1 side along the third side X3, and has an end portion side extending in an L shape along the first side X1 to the fourth side X4 side. The second gate wiring portion 17W is provided at a position adjacent to the fourth side X4, extends from the central wiring portion 13W toward the first side X1 along the fourth side X4, and has an end portion side extending in an L shape toward the third side X3 along the first side X1. The second gate wiring portion 17V is provided at a position adjacent to the central wiring portion 13V, and has a rectangular shape extending from the central wiring portion 13V side to the first side X1 side.

The two

source wiring portions

15U and 15W each have a rectangular shape extending from the second side X2 side to the first side X1 side. The source wiring portion 15U is provided at a position adjacent to the center wiring portion 13U and the second gate wiring portion 17U. The source wiring portion 15W is provided at a position adjacent to the central wiring portion 13W and the second gate wiring portion 17W. The source wiring portion 15V is provided at a position adjacent to the central wiring portion 13V and the second gate wiring portion 17V, extends from the central wiring portion 13V side to the first side X1 side, and has a substantially L-shape in which the width of the central wiring portion 13V side is larger than the width of the first side X1 side.

The third gate wiring portion 18U is provided at a position adjacent to the output wiring portion 14U, extends from the fourth side X4 side to the third side X3 side along the output wiring portion 14U, and has an end portion side extending to the first side X1 side along the source wiring portion 15U, and has a substantially L-shape. A notch is provided at an end portion (a corner portion of an L shape) of the third gate wiring portion 18U on the side of the third side X3 so as to avoid the central wiring portion 13U. The third gate wiring portion 18V is provided at a position adjacent to the output wiring portion 14V, extends from the third side X3 side to the fourth side X4 side along the output wiring portion 14V, and has an end portion side extending to the first side X1 side along the source wiring portion 15V and a substantially L-shape. A notch is provided at an end portion (a corner portion of an L shape) of the third gate wiring portion 18V on the fourth side X4 side so as to avoid the central wiring portion 13V. The third gate wiring portion 18W is provided adjacent to the output wiring portion 14W, extends from the third side X3 toward the fourth side X4 along the output wiring portion 14W, and has an end portion extending toward the first side X1 along the source wiring portion 15V, and has a substantially L-shape. A notch is provided at an end portion (a corner portion of an L shape) of the third gate wiring portion 18W on the fourth side X4 side so as to avoid the central wiring portion 13W.

The ground wiring portion 10U (first ground wiring portion) is provided at a position adjacent to the third gate wiring portion 18U, and has a substantially rectangular shape extending from the third gate wiring portion 18U side to the first side X1 side. The width of the ground wiring portion 10U on the third gate wiring portion 18U side is slightly larger than the width on the first side X1 side. The ground wiring portion 10V (second ground wiring portion) is provided at a position adjacent to the third gate wiring portion 18V and the ground wiring portion 10U, extends from the third gate wiring portion 18V side to the first side X1 side along the ground wiring portion 10U, and has a substantially rectangular shape. The width of the ground wiring portion 10V on the third gate wiring portion 18V side is slightly larger than the width on the first side X1 side. The ground wiring portion 10W (third ground wiring portion) is provided at a position adjacent to the third gate wiring portion 18W, and has a rectangular shape extending from the third gate wiring portion 18W side to the first side X1 side.

Three first current detection wiring portions LC1U, LC1V, LC1W, three second current detection wiring portions LC2U, LC2V, LC2W, one first thermistor wiring portion LT1, and one second thermistor wiring portion LT2 are provided on the surface S of the substrate X at positions on the first side X1 side. The first and second thermistor wiring portions LT1, LT2 are provided in line in the direction of the first side X1 at a position between the second gate wiring portion 17V and the first side X1. The first and second thermistor wiring portions LT1, LT2 extend from the second gate wiring portion 17V toward the first side X1, and are obliquely bent in a crank shape in the middle portion.

The first current detection wiring portion LC1U is provided adjacent to the source wiring portion 15U, extends along the source wiring portion 15U from the second side X2 side to the first side X1 side, and has an L-shape with its end portion side extending to the third side X3 side. The end of the first current detection wiring portion LC1U on the second side X2 side is connected to the source wiring portion 15U below the shunt resistor R1. The first current detection wiring portion LC1V is provided adjacent to the source wiring portion 15V, extends along the source wiring portion 15V from the second side X2 side toward the first side X1 side, and has an L-shape with its end portion side extending toward the fourth side X4 side. The second side X2 side end of the first current detection wiring portion LC1V is connected to the source wiring portion 15V below the shunt resistor R2. The first current detection wiring portion LC1W is provided adjacent to the source wiring portion 15W, extends along the source wiring portion 15W from the second side X2 side to the first side X1 side, and has an L-shape with its end portion side extending to the third side X3 side. The end of the first current detection wiring portion LC1W on the second side X2 side is connected to the source wiring portion 15V below the shunt resistor R3.

The second current detection wiring portion LC2U is provided at a position adjacent to the ground wiring portion 10U, extends from the second side X2 side toward the first side X1 side along the ground wiring portion 10U, and has an L-shape with its end portion side extending toward the fourth side X4 side. The second side X2-side end of the second current detection wiring portion LC2U is connected to the ground wiring portion 10U below the shunt resistor R1. The second current detection wiring portion LC2V is provided at a position adjacent to the ground wiring portion 10V, extends from the second side X2 side toward the first side X1 side along the ground wiring portion 10V, and has an L-shape with its end portion side extending toward the third side X3 side. The end of the second current detection wiring portion LC2V on the second side X2 side is connected to the ground wiring portion 10U below the shunt resistor R2. The second current detection wiring LC2W is provided adjacent to the ground wiring 10W, extends along the ground wiring 10W from the second side X2 side to the first side X1 side, and has an L-shape with its end portion side extending to the third side X3 side. The second side X2-side end of the second current detection wiring portion LC2W is connected to the ground wiring portion 10W below the shunt resistor R3.

The three first switching elements Q1 to Q3, the three second switching elements Q4 to Q6, and the three third switching elements Q7 to Q9 may be appropriate switching elements, and MOSFETs having the same shape may be used for the electronic module 1. The three first connection terminals CL1 to CL3, the three second connection terminals CL4 to CL6, the three third connection terminals CL7 to CL9, the three fourth connection terminals CL10 to CL12, the three fifth connection terminals CL13 to CL15, and the three sixth connection terminals CL16 to CL18 are formed by bending a plate-shaped conductive member, and each of the three first connection terminals, the three fourth connection terminals, the three fifth connection terminals, the three sixth connection terminals, the three first connection terminals, the three fourth connection terminals, the three fifth connection terminals, the three sixth connection terminals, the three fifth connection terminals, the three sixth connection terminals, the three connection terminals, the first connection terminals, the three connection terminals, the three connection terminals, the three connection terminals, the first connection terminals, the three connection terminals, the three connection terminals, the three connection terminals, the first connection terminals, the first connection terminals, the third connection terminals, the first connection terminals, the switching elements, the first connection terminals, the switching element, the connection terminals, the switching elements, the switching element. The connecting portion is formed in an arch shape having a substantially inverted C-shaped cross-sectional view so as not to short-circuit the two wiring portions connected by the connector. The three first connection terminals CL1 to CL3, the three second connection terminals CL4 to CL6, and the three third connection terminals CL7 to CL9 connect the source electrodes of the switching elements and the wiring portions on the surface S, and all have the same shape. The first connection portion of the connection terminals has a width corresponding to a width of the source electrode, and the second connection portion is narrower than the first connection portion. The three fourth connection terminals CL10 to CL12, the three fifth connection terminals CL13 to CL15, and the three sixth connection terminals CL16 to CL18 connect the gates of the switching elements and the wiring portions on the surface S, and all have the same shape. The first connection portion of the connection terminals has a width corresponding to a width of the gate electrode, and the second connection portion is wider than the first connection portion.

The three first switching elements Q1 to Q3 are arranged on the power wiring portion 12, respectively. The first switching element Q1 is provided on the power wiring portion 12 at a position close to the third side X3. The first switching element Q2 is provided at a substantially central position along the direction of the second side X2 on the power supply wiring portion 12. The first switching element Q3 is provided on the power supply wiring portion 12 at a position close to the fourth side X4. The three first switching elements Q1 to Q3 have a source and a gate arranged on the front surface side of each switching element, and a drain on the back surface side. The first switching element Q1 is provided such that the gate is located on the third side X3 side, and the drain is connected to the power supply wiring 12. The source of the first switching element Q1 is connected to the central wiring 13U through a first connection terminal CL1, and the gate of the first switching element Q1 is connected to the first gate wiring 16U through a fourth connection terminal CL 10. The first switching element Q2 is arranged such that the gate is directed toward the fourth side X4 side, and is disposed such that the drain is connected to the power wiring portion 12. The source of the first switching element Q2 is connected to the central wiring 13V through a first connection terminal CL2, and the gate of the first switching element Q2 is connected to the first gate wiring 16V through a fourth connection terminal CL 11. The first switching element Q3 is provided such that the gate is located on the fourth side X4 side, and the drain is connected to the power supply wiring 12. The source of the first switching element Q3 is connected to the center wiring 13W through a first connection terminal CL3, and the gate of the first switching element Q3 is connected to the first gate wiring 16W through a fourth connection terminal CL 12.

The three second switching elements Q4 to Q6 are provided at positions on the

central wiring portion

13U, 13V, 13W on the first side X1 side, respectively. The three second switching elements Q4 to Q6 have a source and a gate arranged on the front surface side of each switching element, and a drain on the back surface side. The second switching element Q4 is provided such that the gate is located on the third side X3 side, and the drain is connected to the central wiring portion 13U. The source of the second switching element Q4 is connected to the source wiring 15U through the second connection terminal CL4, and the gate of the second switching element Q4 is connected to the second gate wiring 17U through the fifth connection terminal CL 13. The second switching element Q5 is provided such that the gate is toward the fourth side X4 side, and the drain is connected to the central wiring portion 13V. The source of the second switching element Q5 is connected to the source wiring 15V through the second connection terminal CL5, and the gate of the second switching element Q5 is connected to the second gate wiring 17V through the fifth connection terminal CL 14. The second switching element Q6 is disposed such that the gate is located on the fourth side X4 side, and the drain is connected to the central wiring portion 13W. The source of the second switching element Q6 is connected to the source wiring portion 15W through the second connection terminal CL6, and the gate of the second switching element Q6 is connected to the second gate wiring portion 17W through the fifth connection terminal CL 15.

The three third switching elements Q7 to Q9 are provided at substantially the center of the

output wiring portions

14U, 14V, and 14W, respectively. The three third switching elements Q7 to Q9 have a source and a gate arranged on the front surface side of each switching element, and a drain on the back surface side. The third switching element Q7 is disposed such that the gate is toward the first side X1 side, and the drain is connected to the output wiring section 14U. The source of the third switching element Q7 is connected to the center wiring 13U through a third connection terminal CL7, and the gate of the third switching element Q7 is connected to the third gate wiring 18U through a sixth connection terminal CL 16. The third switching element Q8 is provided such that the gate is directed toward the first side X1 side, and the drain is connected to the output wiring section 14V. The source of the third switching element Q8 is connected to the center wiring 13V through a third connection terminal CL8, and the gate of the third switching element Q8 is connected to the third gate wiring 18V through a sixth connection terminal CL 17. The third switching element Q9 is provided such that the gate is toward the first side X1 side, and the drain is connected to the output wiring section 14W. The source of the third switching element Q9 is connected to the center wiring 13W via a third connection terminal CL9, and the gate of the third switching element Q9 is connected to the third gate wiring 18W via a sixth connection terminal CL 18.

The three shunt resistors R1 to R3 are provided at positions on the first side X1 side of the

source wiring portions

15U, 15V, and 15W and the

ground wiring portions

10U, 10V, and 10W, respectively, and straddle the

source wiring portions

15U, 15V, and 15W and the

ground wiring portions

10U, 10V, and 10W. The shunt resistor R1 is provided across the source wiring portion 15U and the ground wiring portion 10U so as to be connected. The shunt resistor R2 is provided across the source wiring portion 15V and the ground wiring portion 10V so as to be connected. The shunt resistor R3 is provided across the source wiring portion 15W and the ground wiring portion 10W so as to be connected.

The thermistor RT spans the end portion side on the second side X2 side of the first thermistor wiring portion LT1 and the end portion side on the second side X2 side of the second thermistor wiring portion LT 2.

The power supply terminal VCC, the three motor terminals U, V, W, the ground terminal GND, and the plurality of signal terminals 30 are each formed by machining a conductive plate-like member. The power supply terminal VCC, the three motor terminals U, V, W, and the ground terminal GND are all set to: the external connection portions of the terminals connected to the boards other than the board X are arranged at positions outside the second side X2 along the second side X2, and include a motor terminal U, a motor terminal V, a ground terminal GND, a power supply terminal VCC, and a motor terminal W in this order from the third side X3. Hereinafter, the three motor terminals U, V, W will be also referred to as a first motor terminal U, a second motor terminal V, and a third motor terminal W. The power supply terminal VCC has an external connection portion disposed outside the sealing member a, a base portion connected to the external connection portion, and an internal connection portion provided at a leading end portion extending from the base portion. The internal connection portion of the power supply terminal VCC is connected to the power wiring portion 12 at a position lateral to the first switching element Q2 mounted on the power wiring portion 12. The external connection portion of the power supply terminal VCC is disposed at a position extending from the internal connection portion toward the second side X2 and protruding outside the sealing member a.

The first motor terminal U includes an external connection portion disposed outside the sealing member a, a base portion connected to the external connection portion, an arm portion extending from the base portion, and an internal connection portion provided at a distal end portion of the arm portion. The internal connection portion of the first motor terminal U is connected to the output wiring portion 14U. The external connection portion of the first motor terminal U is disposed at a position closest to the third side X3 side at a position outside the second side X2 of the substrate X. The arm portion of the first motor terminal U is bent in a crank shape so as to dispose the inner and outer connecting portions, as described above.

The second motor terminal V has an external connection portion disposed outside the sealing member a, a base portion connected to the external connection portion, an arm portion extending from the base portion, and an internal connection portion provided at a tip end portion of the arm portion. The internal connection portion of the second motor terminal V is connected to the output wiring portion 14V. The external connection portion of the second motor terminal V is disposed at a position lateral to the first motor terminal U at a position outside the second side X2 of the substrate X. The arm portion of the second motor terminal V is bent in a crank shape so as to dispose the inner and outer connecting portions.

The third motor terminal W has an external connection portion disposed outside the sealing member a, a base portion connected to the external connection portion, an arm portion extending from the base portion, and an internal connection portion provided at a tip end portion of the arm portion. The internal connection portion of the third motor terminal W is connected to the output wiring portion 14W. The external connection portion of the third motor terminal W is disposed at a position closest to the fourth side X4 side at a position outside the second side X2 of the substrate X. The arm portion of the third motor terminal W is bent in a crank shape so as to dispose the inner and outer connecting portions, as described above.

The plurality of signal terminals 30 include: three first gate signal terminals GTU, GTV, GTW connected to the three first

gate wiring portions

16U, 16V, 16W, respectively; three central signal terminals STU, STV, STW connected to the three

central wiring portions

13U, 13V, 13W, respectively; three second gate signal terminals GBU, GBV, GBW connected to the three second

gate wiring portions

17U, 17V, 17W, respectively; three third gate signal terminals GTU1, GTV1, GTW1 connected to the three third

gate wiring portions

18U, 18V, 18W, respectively; a power supply signal terminal VLNKS connected to a portion extending to the first side X1 side of the power supply wiring portion 12; first and second thermistor terminals RTP and RTN connected to the first and second thermistor wiring portions LT1 and LT2, respectively; three first current detection terminals CP1, CP2, and CP3 connected to the three first current detection wiring portions LC1U, LC1V, and LC1W, respectively; and three second current detection terminals CN1, CN2, and CN3 connected to the three second current detection wiring portions LC2U, LC2V, and LC2W, respectively. The external connection portions of the signal terminals 30 connected to the terminals on the substrate or the like other than the substrate X are arranged along the first side X1 at positions outside the first side X1.

As shown in fig. 2 and 3, on the front surface S of the substrate X, there are arranged from the third side X3 side toward the fourth side X4 side in the following order: a U-phase region UA (first-phase region) constituting a circuit for controlling electric power supplied to the three-phase motor via a motor terminal U; a V-phase region VA (second phase region) constituting a circuit for controlling electric power supplied to the three-phase motor via the motor terminal V; and a W-phase area WA (third phase area) constituting a circuit for controlling electric power supplied to the three-phase motor via the motor terminal W.

U phase area UA disposes: the first switching element Q1, the first connection terminal CL1, the center wiring portion 13U, the second switching element Q4, the second connection terminal CL4, the source wiring portion 15U, the shunt resistor R1, the ground wiring portion 10U, the third connection element CL7, the third switching element Q7, the output wiring portion 14U, the fourth connection terminal CL10, the fifth connection terminal CL13, and the sixth connection terminal CL 16. In the U-phase region UA, as shown in fig. 2, 3, and 6, the power supply terminal VCC is electrically connected to the ground terminal GND via the power supply wiring portion 12, the first connection terminal CL1, the first switching element Q1, the central wiring portion 13U, the second switching element Q4, the second connection terminal CL4, the source wiring portion 15U, the shunt resistor R1, and the ground wiring portion 10U. The power supply terminal VCC is electrically connected to the motor terminal U from the central wiring unit 13U via the third connection terminal CL7, the third switching element Q7, and the output wiring unit 14U, and constitutes a control circuit for the power supplied from the motor terminal U to the three-phase motor.

In the V-phase region VA, a first switching element Q2, a first connection terminal CL2, a center wiring portion 13V, a second switching element Q5, a second connection terminal CL5, a source wiring portion 15V, a shunt resistor R2, a ground wiring portion 10V, a third switching element CL8, an output wiring portion 14V, a fourth connection terminal CL11, a fifth connection terminal CL14, and a sixth connection terminal CL17 are arranged. In the V-phase region VA, the power supply terminal VCC is electrically connected to the ground terminal GND via the power supply wiring portion 12, the first connection terminal CL2, the first switching element Q2, the center wiring portion 13V, the second switching element Q5, the second connection terminal CL5, the source wiring portion 15V, the shunt resistor R2, and the ground wiring portion 10V. The power supply terminal VCC is electrically connected to the motor terminal V from the central wiring portion 13V via the third connection terminal CL8, the third switching element Q8, and the output wiring portion 14V, and constitutes a control circuit for the power supplied from the motor terminal V to the three-phase motor.

In W-phase area WA, there are arranged: the first switching element Q3, the first connection terminal CL3, the center wiring portion 13W, the second switching element Q6, the second connection terminal CL6, the source wiring portion 15W, the shunt resistor R3, the ground wiring portion 10W, the third switching element CL9, the output wiring portion 14W, the fourth connection terminal CL12, the fifth connection terminal CL15, and the sixth connection terminal CL 18. In the W-phase area WA, the power supply terminal VCC is electrically connected to the ground terminal GND via the power supply wiring portion 12, the first connection terminal CL3, the first switching element Q3, the center wiring portion 13W, the second switching element Q6, the second connection terminal CL6, the source wiring portion 15W, the shunt resistance R3, and the ground wiring portion 10W. The power supply terminal VCC is connected to the motor terminal W from the central wiring portion 13W via the third connection terminal CL9, the third switching element Q9, and the output wiring portion 14W, and constitutes a control circuit for power supplied from the motor terminal W to the three-phase motor.

As shown in fig. 3, the circuit configuration in the region indicated by the broken line BL1 in the U-phase region UA and the circuit configuration in the region indicated by the broken line BL2 in the V-phase region VA are arranged in line symmetry with respect to the boundary line AX 1. The circuit configuration shown by the broken line BL1 in the U-phase region UA and the circuit configuration in the region shown by the broken line BL3 in the W-phase region WA are arranged in line symmetry with respect to a straight line AX2 passing through the center of the substrate X in the longitudinal direction. The circuit configuration in the region indicated by broken line BL2 in V-phase region VA is the same as the circuit configuration in the region indicated by broken line BL3 in W-phase region WA.

Next, the structure of the ground terminal GND will be explained. In the following description, directions indicated by arrows in the front-back, left-right, and up-down directions shown in fig. 5 will be referred to as a front-back direction, a left-right direction, and an up-down direction. As shown in fig. 4 and 5, the ground terminal GND has: an external connection portion 21 (corresponding to a "first connection portion" described in claims) disposed outside the seal member a; a base portion 22 bent and connected from the external connection portion 21 in a substantially vertical direction; three

arm portions

23U, 23V, 23W branched and connected in three directions from the base portion 22; and three

internal connection portions

24U, 24V, and 24W (corresponding to "the plurality of second connection portions" described in the claims) respectively arranged at the distal ends of the three

arm portions

23U, 23V, and 23W. The external connection portion 21 is connected to a substrate or the like other than the substrate X (corresponding to the "first connection target portion" described in claims). The three

internal connection portions

24U, 24V, and 24W are connected to the

ground wiring portions

10U, 10V, and 10W (corresponding to "a plurality of second connection target portions" in the claims) on the substrate X, respectively. Hereinafter, the three

arm portions

23U, 23V, and 23W are also referred to as a first arm portion 23U, a second arm portion 23V, and a third arm portion 23W. The three

internal connection portions

24U, 24V, and 24W are also referred to as a first internal connection portion 24U, a second internal connection portion 24V, and a third internal connection portion 24W.

The external connection portion 21 is a plate-shaped member extending in the vertical direction. The base portion 22 is a plate-like member connected to the lower end portion of the external connection portion 21 and extending forward, and the front end portion side thereof is formed in a T-shape in plan view widening in the left-right direction.

The three

arm portions

23U, 23V, and 23W are long plate-like members connected to the wide front end portion of the base portion 22 and extending forward. The circumferential lengths (widths and thicknesses) of the cross sections of the three

arm portions

23U, 23V, 23W are equal, respectively. The first arm portion 23U is connected to a position on the left end side of the distal end portion of the base portion 22. The first arm portion 23U includes a rear arm portion extending forward from the base portion 22, a middle arm portion extending diagonally leftward and forward from a front end of the rear arm portion, and a front arm portion extending forward from a front end of the middle arm portion. The front end side of the front arm portion of the first arm portion 23U is bent obliquely downward, and a flat first inner connecting portion 24U is provided that extends forward and is connected to the front end portion thereof.

The second arm portion 23V is connected to the center of the distal end of the base portion 22. The second arm portion 23V includes a rear arm portion extending forward from the base portion 22, a middle arm portion extending obliquely leftward and forward from the front end of the rear arm portion, and a front arm portion extending forward from the front end of the middle arm portion, as well as the first arm portion 23U. The second arm portion 23V is bent obliquely downward at the distal end side of the front arm portion, and is provided with a flat second inner connecting portion 24V connected to the distal end portion thereof and extending forward. The second arm portion 23V extends in parallel with the entire first arm portion 23U from the rear arm portion to the front arm portion at a position adjacent to the right side of the first arm portion 23U. The second inner link 24V provided at the tip of the second arm portion 23V is arranged in parallel with the first inner link 24U at a position adjacent to the right side of the first inner link 24U provided at the tip of the first arm portion 23U.

The third arm portion 23W is connected to a position on the right end side of the distal end portion of the base portion 22. The third arm portion 23W has: a rear arm portion extending forward from the base portion 22, a first middle arm portion extending diagonally forward to the right from a front end of the rear arm portion, a second middle arm portion extending forward from a front end of the first middle arm portion, a first front arm portion extending diagonally forward to the right from a front end of the second middle arm portion, and a second front arm portion extending forward from a front end of the first front arm portion. The front end side of the second front arm portion is bent obliquely downward, and a flat-plate-shaped third inner connecting portion 24W that extends forward is provided in connection with the front end portion of the second front arm portion. The rear arm portion of the third arm portion 23W extends in parallel with the rear arm portion of the second arm portion 23V at a position adjacent to the right side of the rear arm portion of the second arm portion 23V. Third inner connecting portion 24W provided at the tip of third arm portion 23W is arranged in parallel with second inner connecting portion 24V at a position spaced rightward from second inner connecting portion 24V provided at the tip of second arm portion 23V.

At the ground terminal GND, a first wiring length L1 from the external connection portion 21 to the first internal connection portion 24U, a second wiring length L2 from the external connection portion 21 to the second internal connection portion 24V, and a third wiring length L3 from the external connection portion 21 to the third internal connection portion 24W are all the same length. At the ground terminal GND, the current paths from the respective

inner connection portions

24U, 24V, and 24W to the outer connection portion 21 meet at the base portion 22, and therefore the paths from the meeting point 26 to the outer connection portion 21 are common. Therefore, in the ground terminal GND, it can be said that the wiring lengths from the intersection point 26 to the three

internal connection portions

24U, 24V, and 24W are the same length.

At the ground terminal GND, the circumferential lengths (widths and thicknesses) of the cross sections of the three

arm portions

23U, 23V, and 23W are equal to each other, and as described above, the first to third wiring lengths L1 to L3 are equal to each other, whereby the inductances from the external connection portion 21 to the three

internal connection portions

24U, 24V, and 24W are set to the same value (the inductances are equalized). When the wiring length of each arm portion is L, the width of each arm portion is W, and the thickness is H, the inductance Ls of each arm portion can be calculated by the following equation.

[ EQUATION 1 ]

As shown in fig. 2 and 4, the lower surface of the first inner connection portion 24U of the ground terminal GND is connected to the ground wiring portion 10U of the U-phase region UA, the lower surface of the second inner connection portion 24V is connected to the ground wiring portion 10V of the V-phase region VA, and the lower surface of the third inner connection portion 24W is connected to the ground wiring portion 10W of the W-phase region WA. In a state where the electronic module 1 is sealed by the sealing member a, most of the base portion 22 of the ground terminal GND (a portion other than a portion on the side of the portion connected to the external connection portion 21) and the three

arm portions

23U, 23V, 23W are disposed inside the sealing member a.

According to the lead terminals GND and the electronic module 1 of the first embodiment, since the inductances from the external connection portion 21 to the plurality of

internal connection portions

24U, 24V, and 24W are equalized, the external connection portion is less likely to be affected by switching noise from another second connection portion and the arm portion connected to the other second connection portion, and it is possible to prevent a malfunction such as erroneous switching on at an unexpected point in time, thereby improving reliability.

In addition, according to the lead terminals GND and the electronic module 1 according to the first embodiment, since the lead terminals GND and the electronic module include: an external connection portion 21 connected to a substrate or the like other than the substrate X; a base portion 22 connected to the external connection portion 21; a plurality of

arm portions

23U, 23V, 23W branched and connected from the base portion 22; and a plurality of

internal connection portions

24U, 24V, and 24W provided at the tip end portions of the plurality of

arm portions

23U, 23V, and 23W, respectively, and connected to the plurality of internal connection target portions, respectively. Therefore, the external connection portion 21 can be directly connected to the

ground wiring portions

10U, 10V, and 10W on the substrate X via the base portion 22, the

arm portions

23U, 23V, and 23W, and the

internal connection portions

24U, 24V, and 24W. Thus, wiring on the substrate such as the ground bus bar of patent document 1 is not required, and the installation area can be reduced, thereby making the electronic module compact.

Further, according to the lead terminal GND and the electronic module 1 according to the first embodiment, since the circumferential lengths of the cross sections of the

arm portions

23U, 23V, and 23W are equal to each other, the inductances of the

arm portions

23U, 23V, and 23W can be equalized with high accuracy, and the reliability can be further improved.

Further, according to the lead terminals GND and the electronic module 1 according to the first embodiment, since the plurality of arm portions are constituted by the three

arm portions

23U, 23V, and 23W and the three

internal connection portions

24U and 24V provided at the distal end portions of the three

arm portions

23U, 23V, and 23W, respectively, the lead terminals GND are suitable for connection to wiring portions (the

ground wiring portions

10U, 10V, and 10W) in the U-phase region UA, the V-phase region VA, and the W-phase region WA constituting a circuit for controlling electric power supplied to the three-phase motor, and a substrate other than the substrate X, and the like.

[ second embodiment ]

The electronic module according to the second embodiment differs from the electronic module 1 according to the first embodiment in that the ground terminal GND2 is used instead of the ground terminal GND, and the other configuration is the same as that of the electronic module 1. Therefore, in the second embodiment, only the configuration of the ground terminal GND2 will be described, and the other configurations will be omitted. In the description of the second embodiment, the directions of arrows in the front-back direction, the left-right direction, and the up-down direction shown in fig. 8 will be referred to as the front-back direction, the left-right direction, and the up-down direction.

As shown in fig. 7 and 8, the ground terminal GND2 includes: an external connection portion 21 disposed outside the sealing member a; a base portion 22a bent and connected from the external connection portion 21 in a substantially vertical direction; two arm portions 23UV, 23W branched and connected in two directions from the base portion 22 a; and two internal

connection wiring portions

24U, 24W provided at the tip end portions of the two arm portions 23UV, 23W, respectively. The internal connection portion 24UV is connected across the two

ground wiring portions

10U, 10V on the substrate X. The internal connection portion 24W is connected to the ground wiring portion 10W on the substrate X. Hereinafter, the two arm portions 23UV and 23W are also referred to as a first arm portion 23UV and a second arm portion 23W. The two internal connections 24UV and 24W are also referred to as a first internal connection 24UV and a second internal connection 24W.

The external connection portion 21 is a plate-shaped member extending in the vertical direction. The base portion 22a is a plate-like member connected to the lower end portion of the external connection portion 21 and extending forward, and the front end portion side thereof has a T-shape in plan view widening in the left-right direction.

The two arm portions 23UV, 23W are each a long plate-like member connected to the wide front end portion of the base portion 22a and extending forward. The circumferential lengths (widths and thicknesses) of the cross sections of the two arm portions 23UV and 23W are equal to each other. The first arm portion 23UV is connected to the left end side of the distal end portion of the base portion 22 a. The first arm portion 23UV has a rear arm portion extending forward from the base portion 22a, a middle arm portion extending diagonally left and forward from a front end of the rear arm portion, and a front arm portion extending forward from a front end of the middle arm portion. The front end side of the front arm portion of the first arm portion 23UV is bent obliquely downward, and a flat first internal connection portion 24UV is provided that extends forward and is connected to the front end portion thereof.

The second arm portion 23W is connected to a position on the right end side of the distal end portion of the base portion 22. The second arm portion 23W has a rear arm portion extending forward from the base portion 22a, a first middle arm portion extending diagonally forward to the right from the front end of the rear arm portion, a second middle arm portion extending forward from the front end of the first middle arm portion, a first front arm portion extending diagonally forward to the right from the front end of the second middle arm portion, and a second front arm portion extending forward from the front end of the first front arm portion. The second front arm portion has a front end side bent obliquely downward, and a second inner connecting portion 24W in a flat plate shape connected to the front end portion of the second front arm portion and extending forward is provided. The rear arm portion of the second arm portion 23W extends in parallel with the rear arm portion of the first arm portion 23UV at a position adjacent to the right side of the rear arm portion of the first arm portion 23 UV. Second inner joint portion 24W provided at the tip of second arm portion 23W is arranged in parallel with first inner joint portion 24UV at a position spaced rightward from first inner joint portion 24UV provided at the tip of first arm portion 23 UV.

At the ground terminal GND2, a first wiring length L4 from the external connection portion 21 to the first internal connection portion 24UV and a second wiring length L5 from the external connection portion 21 to the second internal connection portion 24W are the same length. At the ground terminal GND2, the paths of the currents from the respective inner connecting portions 24UV, 24W to the outer connecting portion 21 meet at the base portion 22a, and therefore the paths from the meeting point 27 to the outer connecting portion 21 are common. Therefore, it can be said that the wiring lengths from the junction 27 to the two internal connection portions 24UV and 24W at the ground terminal GND2 are the same.

In the ground terminal GND2, the circumferential lengths (width and thickness) of the cross sections of the two arm portions 23UV and 23W are equal to each other, and the first wiring length L4 and the second wiring length L5 are made to be the same length, whereby the inductances from the external connection portion 21 to the two internal connection portions 24UV and 24W are set to be the same (the inductances are equalized).

As described above, the configuration of the ground terminal GND2 and the lead terminals of the electronic module 2 according to the second embodiment is different from the configuration of the ground terminal GND and the electronic module 1 according to the first embodiment, but since the inductances from the external connection portion 21 to the plurality of internal connection portions 24UV through the plurality of internal connection portions 24UV and 24W are equalized as in the electronic module 1 according to the first embodiment, the influence of switching noise from other internal connection portions and arm portions connected to other phases is less likely to be received. Thus, it is possible to prevent a failure such as erroneous switching-on at an unexpected point in time, and to improve reliability.

In addition, the electronic module and the ground terminal GND2 according to the second embodiment have the same configurations as the electronic module 1 and the ground terminal GND according to the first embodiment except for the configuration of the ground terminal GND, and therefore the electronic module 1 and the ground terminal GND according to the first embodiment also have the corresponding effects.

[ third embodiment ]

The electronic module according to the third embodiment is different from the electronic module 1 according to the first embodiment in that the ground terminal GND3 is used instead of the ground terminal GND, and the other configuration is the same as that of the electronic module 1. Therefore, in the third embodiment, only the configuration of the ground terminal GND3 will be described, and descriptions of other configurations will be omitted. In the description of the third embodiment, the directions indicated by the arrows in fig. 10, i.e., the front-back direction, the left-right direction, and the up-down direction, will be referred to as the front-back direction, the left-right direction, and the up-down direction.

As shown in fig. 9 and 10, the ground terminal GND3 includes: an external connection portion 21 disposed outside the sealing member a; a base portion 22 bent and connected from the external connection portion 21 in a substantially vertical direction; a common lead frame 25 extending in the front direction, connected to the base portion 22 and extending in the left-right direction; three

arm portions

23U, 23V, and 23W branched and connected from the base portion 22 via the common lead frame 25; and three inner connecting

portions

24U, 24V, 24W provided at the front end portions of the three

arm portions

23U, 23V, 23W, respectively.

The external connection portion 21 is a plate-shaped member extending in the vertical direction. The base portion 22 is a plate-like member connected to the lower end portion of the external connection portion 21 and extending forward, and has a T-shape in plan view with its front end portion side widened in the lateral direction.

The common lead frame 25 is a plate-like member that is connected to the front end portion side of the base portion 22, and then extends forward while spreading in the left-right direction. The common lead frame 25 includes: a rear frame portion extending forward from the base portion 22; a first middle frame part extending forward with the right side extending in a tapered shape from the front end of the rear frame part; a second middle frame, the right side of which extends in a tapered shape from the front end of the first middle frame part and the left side of which also extends in a tapered shape and extends forwards; and a front frame portion extending forward from a front end of the second middle frame portion. The common lead frame 25 can be said to have a shape that fills the space between the mutually adjacent arm portions of the three

arm portions

23U, 23V, 23W in the first embodiment. The common lead frame 25 covers: most of the switching elements except for the vicinity of the gate of the first switching element Q2, most of the switching elements except for a part of the corner of the third switching element Q8, the entire second switching element Q5, 4 on the fourth side X4 side of the third switching element Q7, and 4 on the third side X3 side of the third switching element Q9.

The three

arm portions

23U, 23V, and 23W are elongated plate-like members connected to the widened front end portion of the common lead frame 25 and extending forward. The circumferential lengths (widths and thicknesses) of the cross sections of the three

arm portions

23U, 23V, 23W are equal, respectively. The first arm portion 23U is connected to a position on the left end side of the front end portion of the common lead frame 25. The first arm portion 23U includes a rear arm portion extending forward from the front end portion of the common lead frame 25, and a front arm portion extending forward from the front end of the rear arm portion. The front end side of the front arm portion of the first arm portion 23U is bent obliquely downward, and a first inner connecting portion 24U in a flat plate shape is provided which is connected to the front end portion and extends forward.

The second arm portion 23V is connected to a position adjacent to the right side of the first arm portion 23U in the front end portion of the common lead frame 25. The second arm portion 23V has a rear arm portion extending forward from the front end portion of the common lead frame 25, and a front arm portion extending forward from the front end of the rear arm portion. The front end side of the front arm portion of the first arm portion 23U is bent obliquely downward, and a flat second inner connecting portion 24V is provided that extends forward and is connected to the front end portion thereof. The entire portion from the rear arm portion to the front arm portion of the second arm portion 23V extends in parallel with the entire first arm portion 23U.

The third arm portion 23W is connected to a position on the right end side of the front end portion of the common lead frame 25. The third arm portion 23W has a rear arm portion extending forward from the front end portion of the common lead frame 25, and a front arm portion extending forward from the front end of the rear arm portion. The front end side of the front arm portion of the third arm portion 23W is bent obliquely downward, and a flat-plate-shaped third inner connecting portion 24W extending forward is provided in connection with the front end portion thereof.

Common lead frames are provided between the base portion 22 and the three

arm portions

23U, 23V, 23W on the ground terminal GND3 between the external connection portion 21 and the first internal connection portion 24U, between the external connection portion 21 and the second internal connection portion 24V, and between the external connection portion 21 and the third internal connection portion 24W. Therefore, in the ground terminal GND3, since the current paths from the

internal connection portions

24U, 24V, and 24W to the external connection portion 21 are shared by the common lead frame 25, the paths from the three

arm portions

23U, 23V, and 23W to the external connection portion 21 are also shared. Therefore, in the ground terminal GND3, it can be said that the wiring lengths from the three

arm portions

23U, 23V, 23W to the three

internal connection portions

24U, 24V, 24W are the same.

In the ground terminal GND3, the circumferential lengths (widths and thicknesses) of the cross sections of the three

arm portions

23U, 23V, and 23W are equal to each other, and as described above, the lengths from the three

arm portions

23U, 23V, and 23W to the external connection portion 21 are equal to each other, whereby the inductances from the external connection portion 21 to the three

internal connection portions

24U, 24V, and 24W are set to the same inductances (that is, the inductances are equalized to each other).

As described above, the ground terminal GND3 and the electronic module 3 according to the third embodiment are different from the ground terminal GND and the electronic module 1 according to the first embodiment in that the ground terminal GND3 is used instead of the ground terminal GND, but the inductances of the external connection unit 21 and the plurality of

internal connection units

24U, 24V, and 24W are equalized similarly to the ground terminal GND and the electronic module 1 according to the first embodiment, and therefore, the external connection unit 21 and the plurality of

internal connection units

24U, 24V, and 24W are less likely to be affected by switching noise from other internal connection units and arm units connected to the other internal connection units. Thus, it is possible to prevent a malfunction such as erroneous switching-on at an unexpected point in time, thereby improving reliability.

In addition, according to the electronic module and the ground terminal GND3 of the third embodiment, since the three

arm portions

23U, 23V, and 23W include the common lead frame 25 formed between the base portion 22, the electronic components (the first switching element Q2, the third switching element Q8, the second switching element Q5, the third switching element Q7, and the third switching element Q9) can be covered with the common lead frame 25, and electromagnetic noise emitted from the electronic components can be blocked.

Further, according to the electronic module and the ground terminal GND3 of the third embodiment, since the common lead frame 25 formed between the three

arm portions

23U, 23V, and 23W and the base portion 22 is provided, the resistance component and the inductance can be reduced as compared with the long arm portion branched from the base portion 22.

The electronic module and the ground terminal GND3 according to the third embodiment have the same configuration as the electronic module 1 and the ground terminal GND according to the first embodiment except that the ground terminal GND3 is used instead of the ground terminal GND, and therefore the electronic module 1 and the ground terminal GND according to the first embodiment have the related effects.

The present invention has been described above based on the above embodiments, but the present invention is not limited to the above embodiments. The present invention can be implemented in various forms without departing from the scope of the present invention, and for example, the following modifications can be made.

The shapes, positions, sizes, and the like described in the above embodiments are merely examples, and may be changed within a range not impairing the effects of the present invention.

In each of the above embodiments, the ground terminal has equal circumferential lengths (widths and thicknesses) of the cross sections of the arm portions and equal wiring lengths from the external connection portion to the internal connection portions, thereby equalizing inductances from the external connection portion to the internal connection portions. However, the respective inductances may be equalized by appropriately adjusting the circumferential lengths of the cross sections of the arm portions and the respective wiring lengths from the external connection portions to the plurality of internal connection portions. That is, the respective wiring lengths from the external connection portion to the plurality of internal connection portions and the circumferential lengths (widths and thicknesses) of the arm portion cross sections may not be equal.

For example, as shown in fig. 11, the first to third wiring lengths L1 to L3 of the three

arm portions

23U, 23V, 23W are the same length, but when the width of the third arm portion 23W is smaller than the widths of the first and

second arm portions

23U, 23V, the inductance may be equalized by making the thickness of the third arm portion 23W larger than the thicknesses of the first and

second arm portions

23U, 23V. As shown in fig. 12, the first to third wiring lengths L1 to L3 of the three

arm portions

23U, 23V, and 23W are the same length, but when the width of the third arm portion 23W is larger than the widths of the first and

second arm portions

23U and 23V, the inductance may be equalized by making the thickness of the third arm portion 23W smaller than the thicknesses of the first and

second arm portions

23U and 23V. In addition, the values of the width and the thickness can be calculated by the aforementioned formulas.

As shown in fig. 13, when the third wiring length L3 of the third arm portion 23W is shorter than the first and second wiring lengths L1, L2 of the first and

second arm portions

23U, 23V, the inductance is equalized by making the width of the third arm portion 23W smaller than the widths of the first and

second arm portions

23U, 23V. In this case, the inductance may not be equalized by making the width of the third arm portion 23W smaller than the thickness of the first and

second arm portions

23U, 23V. In addition, the inductance can be equalized by reducing both the width and the thickness. As shown in fig. 14, when the third wiring length L3 of the third arm portion 23W is longer than the first and second wiring lengths L1, L2 of the first and

second arm portions

23U, 23V, the inductance is equalized by making the thickness of the third arm portion 23W larger than the thickness of the first and

second arm portions

23U, 23V. In this case, the inductance may be equalized by making the width of the third arm portion 23W larger than the widths of the first and

second arm portions

23U and 23V, instead of making the thickness larger. In addition, the inductance may be equalized by increasing both the width and the thickness. The values of width and thickness can be calculated by the aforementioned formulas. The inductance is equalized by adjusting at least one of the width, thickness, and wiring length of the arm portion in this manner.

In the above embodiments, the example in which the lead terminal of the present invention is applied to the ground terminal has been described, but the lead terminal of the present invention may be applied to a terminal other than the ground terminal.

[ notation ] to show

1 … electronic module; a 10U, 10V, 10W, 10VW … grounding wiring part; 21 … external connection (first connection); 22. 22a … base portion;

arm parts

23U, 23V, 23W, 23UV …; 24U, 24V, 24W, 24UV … internal connections (second connections); 25 … common lead frame; GND, GND2, GND3, GND4, GND5, GND6, and GND7 … lead terminals (ground terminals).

Claims

1. A lead terminal, characterized by comprising:

a first connection unit connected to the first connection target unit;

a base portion connected to the first connection portion;

a plurality of arm portions branched and connected from the base portion; and

a plurality of second connection parts respectively provided at the tip parts of the plurality of arm parts and respectively connected to the plurality of second connection target parts,

wherein respective inductances from the first connection portion to the plurality of second connection portions are equalized.

2. A lead terminal according to claim 1, characterized in that:

wherein the inductance is uniformized based on respective wiring lengths from the first connection portion to the plurality of second connection portions and a circumferential length of a cross section of the plurality of arm portions.

3. A lead terminal according to claim 1 or 2, characterized in that:

wherein the plurality of arm portions are constituted by three arm portions,

the lead terminals include three second connection portions provided at front end portions of the three arm portions, respectively.

4. A lead terminal according to any one of claims 1 through 3, further comprising:

a common lead frame formed between the plurality of arm portions and the base portion.

5. An electronic module, comprising:

a substrate; and

the lead terminal according to any one of claims 1 to 4,

wherein the plurality of second connection object parts are provided on the substrate.