CN114566821B

CN114566821B - Lead terminal and electronic module

Info

Publication number: CN114566821B
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: 2024-06-28
Anticipated expiration: 2041-11-17
Also published as: CN114566821A

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 unit (21) connected to the first connection target unit; a base body part (22) connected to the first connection part (21); a plurality of arm sections (23U, 23V, 23W) which branch from the base section (22) and are connected; and a plurality of second connection portions 24U, 24V, 24W which are provided at the tip portions of the plurality of arm portions (23U, 23V, 23W) and are connected to the plurality of second connection target portions 10U, 10V, 10W, respectively, wherein the inductances of the first connection portion (21) to the plurality of second connection portions (24U, 24V, 24W) are equalized.

Description

Lead terminal and electronic module

Technical Field

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

Background

Conventionally, an electronic module that converts dc power input from a dc power supply into ac power and outputs the ac power is known (for example, refer to 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. In addition, a ground bus is provided on the substrate along the long side of the substrate. 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 are provided in the first phase region, the second phase region, and the third phase region, respectively. The three third switching elements are connected to the ground bus bar via Clip leads (Clip-lead), wiring on the substrate, and shunt resistors, respectively. A ground terminal connected to the ground bus bar is provided at a central position in the longitudinal direction of the ground bus bar.

[ Prior Art literature ]

Japanese patent application laid-open No. 2016-197985

In the electronic module described in patent document 1, three third switching elements are connected to a ground bus bar via ground terminals (lead terminals), wiring on a substrate, and shunt resistors, respectively, and the ground terminals are provided at the center positions in the longitudinal direction of the ground bus bar. In this way, the length of the wiring from the external connection portion of the ground terminal to the connection portion with the shunt resistor in the ground bus is different from each other, and the inductance is different from each other, so that the wiring is susceptible to switching noise from other phases. In addition, in the electronic module described in patent document 1, since it is necessary to reserve an area of the ground bus bar for a predetermined value on the substrate, there is also a problem that it is difficult to miniaturize the electronic module.

In view of the above-described problems, an object of the present invention is to provide a lead terminal that can improve reliability and miniaturize an electronic module when applied to 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 from the base portion and connected to each other; and a plurality of second connection portions (for example, the internal connection portions 24U, 24V, 24W in the first embodiment) which are provided at the distal end portions of the plurality of arm portions and are connected to the plurality of second connection target portions (10V, 10W), respectively, wherein the respective inductances from the first connection portions to the plurality of second connection portions are equalized.

The electronic module according to the present invention is characterized by comprising: a substrate; and the lead terminal, wherein the plurality of second connection target 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 portion to the plurality of second connection portions are equalized, the lead terminal is not easily affected by switching noise from the other second connection portions and the arm portion connected to the other after the electronic module is mounted thereon. Thus, it is possible to prevent a malfunction such as erroneous conduction of the switch at an unintended point in time, and to improve reliability.

Also, the lead terminal and the electronic module according to the present invention, since they include: a first connection section connected to the first connection target section; a base portion connected to the first connection portion; a plurality of arm portions branched from the base portion; and a plurality of second connection portions provided at the distal ends of the plurality of arm portions and connected to the plurality of second connection target portions, respectively, so that when the lead terminal is mounted on the electronic module, the lead terminal can be directly connected to the wiring on the substrate via the base portion, the arm portion, and the second connection portions through the first connection portions. As described above, wiring on a substrate such as a ground bus bar is not required as in patent document 1, and the installation area is reduced to miniaturize 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 wiring, switching elements, and connection terminals on the circuit board of the electronic module 1 according to the first embodiment.

Fig. 4 is a plan view showing a 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 showing a relationship between the electronic module 2 and the ground terminal GND2 according to the second embodiment.

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 an upper 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 an upper 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 plan 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 a ground terminal GND5 according to a second modification, in which (a) is a plan 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 a ground terminal GND6 according to a third modification, in which (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 a ground terminal GND7 of a fourth modification, in which (a) is a plan view of the ground terminal GND7 and (b) is a lower perspective view of the ground terminal GND 7.

Detailed Description

The lead terminal and the electronic module according to the present invention will be described below with reference to the drawings. The drawings are schematic and do not necessarily strictly reflect actual dimensions. The embodiments described below do not limit the invention according to the claims. In addition, not all the elements and combinations thereof described in the embodiments are necessary for the solving means of the present invention. In each embodiment, the same reference numerals are used in the embodiment to explain the same components and elements (including the components whose shapes and the like are not exactly the same) such as basic structures, features, functions, and the like, and overlapping descriptions are omitted.

[ First embodiment ]

The electronic module 1 according to the first embodiment is an electronic module for controlling electric power supplied from a power source to a three-phase motor. As shown in fig. 2 and 3, the electronic module 1 includes: the three-phase switching element comprises 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 by a sealing member a except for a portion of each terminal on the side of an 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 adhering a metal plate are provided on one surface (hereinafter referred to as surface S) of the substrate X, and a metal plate 11 for heat radiation is adhered to the other surface (back surface) of the substrate X. Specifically, on the surface S of the substrate X, a rectangular power supply wiring portion 12 extending from the vicinity of the third side X3 to the vicinity of the fourth side X4 along the second side X2 is provided at a position on the second side X2 side. The power supply wiring portion 12 has an L-shaped portion extending to the first side X1 and having an end portion extending along the first side X1 toward the fourth side X4 at a position between a first gate wiring portion 16V and an output wiring portion 14W described later.

Three central wiring portions 13U, 13V, 13W, three first gate wiring portions 16U, 16V, 16W, and three output wiring portions 14U, 14V, 14W are provided on the surface S of the substrate X at a position on the first side X1 adjacent to the power wiring portion 12. The central wiring portion 13U has an L-shape extending from the second side X2 to the first side X1 and the end portion to the third side X3, and is provided adjacent to the third side X3. The central wiring portions 13V and 13W each have an L-shape extending from the second side X2 to the first side X1 and 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, 16W each have a rectangular shape extending from the second side X2 to the first side X1. The first gate wiring portion 16U is provided adjacent to the third side X3 and the central wiring portion 13U, and is formed in an overall rectangular shape in combination with the L-shaped central wiring portion 13U. The first gate wiring portion 16W is provided adjacent to the fourth side X4 and the central wiring portion 13W, and is formed in an overall rectangular shape in combination with the L-shaped central wiring portion 13W. The first gate wiring portion 16V is provided at a position adjacent to the central wiring portion 13V, and is formed in an overall rectangular shape in combination with the L-shaped central wiring portion 13V.

The three output wiring portions 14U, 14V, 14W each have a rectangular shape extending from the second side X2 to the first side X1. 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 central wiring portion 13U, and the output wiring portion 14V is provided at a position adjacent to the central wiring portion 13V. The output wiring portion 14W is provided adjacent to the central wiring portion 13W at a position between the two central wiring portions 13V, 13W.

On the surface S of the substrate X, 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 at positions on the first side X1 side adjacent to the central wiring portions 13U, 13V, 13W and the output wiring portions 14U, 14V, 14W. The second gate wiring portion 17U is provided adjacent to the third side X3, extends along the third side X3 from the central wiring portion 13U toward the first side X1, and has an end portion extending along the first side X1 toward the fourth side X4 in an L-shape. The second gate wiring portion 17W is provided at a position adjacent to the fourth side X4, and extends from the central wiring portion 13W to the first side X1 along the fourth side X4, and its end portion side extends along the first side X1 to the third side X3 side in an L-shape. The second gate wiring portion 17V is provided 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 have a rectangular shape extending from the second side X2 to the first side X1. The source wiring portion 15U is provided adjacent to the central wiring portion 13U and the second gate wiring portion 17U. The source wiring portion 15W is provided adjacent to the central wiring portion 13W and the second gate wiring portion 17W. The source wiring portion 15V is provided adjacent to the central wiring portion 13V and the second gate wiring portion 17V, extends from the central wiring portion 13V to the first side X1, and has a substantially L-shape with a width on the central wiring portion 13V side larger than a width on the first side X1.

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

The ground wiring portion 10U (first ground wiring portion) is provided 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, and extends along the ground wiring portion 10U from the third gate wiring portion 18V side to the first side X1 side, 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 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, LC W, three second current detection wiring portions LC2U, LC2V, LC W, one first thermistor wiring portion LT1, and one second thermistor wiring portion LT2 are provided on the substrate X surface S at positions on the first side X1. The first and second thermistor wiring portions LT1, LT2 are arranged in the direction of the first side X1 at positions 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 bent obliquely into a crank-like shape at the intermediate 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 to the first side X1, and has an L-shape extending toward the third side X3 at its end. The second side X2 side end of the first current detection wiring portion LC1U 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 to the first side X1, and has an L-shape extending toward the fourth side X4 at its end portion. 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 to the first side X1, and has an L-shape extending toward the third side X3 at its end. The second side X2 side end of the first current detection wiring portion LC1W 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 along the ground wiring portion 10U from the second side X2 to the first side X1, and has an L-shape with its end portion extending toward the fourth side X4. The second current detection wiring portion LC2U is connected to the ground wiring portion 10U at an end portion on the second side X2 side below the shunt resistor R1. The second current detection wiring portion LC2V is provided adjacent to the ground wiring portion 10V, extends along the ground wiring portion 10V from the second side X2 to the first side X1, and has an L-shape extending toward the third side X3 at its end. The second side X2 side end of the second current detection wiring portion LC2V is connected to the ground wiring portion 10U below the shunt resistor R2. The second current detection wiring portion LC2W is provided adjacent to the ground wiring portion 10W, extends along the ground wiring portion 10W from the second side X2 to the first side X1, and has an L-shape with its end portion extending toward the third side X3. 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 respectively suitable switching elements, and MOSFETs having the same shape may be used in 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 each formed by bending a plate-like conductive member, and each has a first connection portion connected to an electrode on the upper surface of the switching element, a second connection portion connected to a wiring portion on the surface S, and a connection portion for connecting the first connection portion and the second connection portion. The connecting portion has a substantially inverted C-shaped cross-sectional view so as not to short-circuit 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 electrode of each switching element and the wiring portion on the surface S, and are all the same shape. The first connection portions of the connection terminals have a width corresponding to the width of the source electrode, and the second connection portions are narrower than the first connection portions. 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 switching element gates and the wiring portions on the surface S, and are all the same shape. The first connection portions of the connection terminals have a width corresponding to the width of the gate electrode, and the second connection portions are wider than the first connection portions.

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

The three second switching elements Q4 to Q6 are provided at positions on the first side X1 side of the central wiring portions 13U, 13V, 13W, respectively. The three second switching elements Q4 to Q6 are arranged on the front surface side of each switching element to form a source electrode and a gate electrode, and on the rear surface side thereof to form a drain electrode. The second switching element Q4 is disposed 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 disposed such that the gate is directed to the fourth side X4, 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, 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 are arranged on the front surface side of each switching element to form a source electrode and a gate electrode, and on the rear surface side thereof to form a drain electrode. The third switching element Q7 is disposed such that the gate is directed to 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 central wiring 13U through the third connection terminal CL7, and the gate of the third switching element Q7 is connected to the third gate wiring 18U through the sixth connection terminal CL 16. The third switching element Q8 is disposed such that the gate is directed to 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 the third connection terminal CL8, and the gate of the third switching element Q8 is connected to the third gate wiring 18V through the sixth connection terminal CL 17. The third switching element Q9 is disposed such that the gate is directed to 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 central wiring 13W through the third connection terminal CL9, and the gate of the third switching element Q9 is connected to the third gate wiring 18W through the 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, 15W and the ground wiring portions 10U, 10V, 10W, respectively, and cross the source wiring portions 15U, 15V, 15W and the ground wiring portions 10U, 10V, 10W. The shunt resistor R1 is provided so as to cross the source wiring portion 15U and the ground wiring portion 10U. The shunt resistor R2 is provided so as to cross the source wiring portion 15V and the ground wiring portion 10V. The shunt resistor R3 is provided so as to cross the source wiring portion 15W and the ground wiring portion 10W.

The thermistor RT spans the end side of the second side X2 side of the first thermistor wiring portion LT1 and the end side of 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 processing 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 substrate or the like other than the substrate X are arranged at positions outside the second side X2 along the second side X2, and are the motor terminal U, the motor terminal V, the ground terminal GND, the power supply terminal VCC, and the motor terminal W in this order from the third side X3 side. Hereinafter, three motor terminals U, V, W are 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 front end portion extending from the base portion. The internal connection portion of the power supply terminal VCC is connected to the power supply wiring portion 12 at a side position of the first switching element Q2 mounted to the power supply wiring portion 12. The external connection portion of the power supply terminal VCC is disposed at a position extending from the internal connection portion in the second side X2 direction and protruding to the outside of the sealing member a.

The first motor terminal U 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 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 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 in such a manner that the inner and outer connection portions are arranged 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 connection 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 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 in such a manner that the inner and outer connection portions are arranged 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 sections 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 sections 17U, 17V, 17W, respectively; three third gate signal terminals GTU1, GTV1, GTW1 connected to the three third gate wiring sections 18U, 18V, 18W, respectively; a power signal terminal VLNKS connected to a portion extending to the first side X1 of the power wiring portion 12; first and second thermistor terminals RTP, RTN connected to the first and second thermistor wiring portions LT1, LT2, respectively; three first current detection terminals CP1, CP2, CP3 connected to the three first current detection wiring portions LC1U, LC1V, LC W, respectively; and three second current detection terminals CN1, CN2, CN3 connected to the three second current detection wiring portions LC2U, LC2V, LC W, respectively. The external connection portions of the plurality of signal terminals 30, each connected to a terminal on a 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 surface S of the substrate X, from the third side X3 side toward the fourth side X4 side, there are arranged 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 the 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 region WA (third phase region) constituting a circuit for controlling electric power supplied to the three-phase motor via the motor terminal W.

The U-phase area UA is provided with: 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 CL16. 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 portion 13U via the third connection terminal CL7, the third switching element Q7, and the output wiring portion 14U, and constitutes a control circuit for supplying electric power from the motor terminal U to the three-phase motor.

In the V-phase region VA, the first switching element Q2, the first connection terminal CL2, the central wiring portion 13V, the second switching element Q5, the second connection terminal CL5, the source wiring portion 15V, the shunt resistor R2, the ground wiring portion 10V, the third switching element CL8, the output wiring portion 14V, the fourth connection terminal CL11, the fifth connection terminal CL14, and the 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 central 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 supplying electric power from the motor terminal V to the three-phase motor.

In the W-phase region WA, there are disposed: 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 CL18. In the W-phase region 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 central wiring portion 13W, the second switching element Q6, the second connection terminal CL6, the source wiring portion 15W, the shunt resistor 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 supplying electric power from the motor terminal W to the three-phase motor.

As shown in fig. 3, the circuit structure in the region indicated by the broken line BL1 in the U-phase region UA and the circuit structure 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 structure shown by the broken line BL1 in the U-phase region UA and the circuit structure 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 structure in the region indicated by the broken line BL2 in the V-phase region VA is in the same configuration as the circuit structure in the region indicated by the broken line BL3 in the W-phase region WA.

Next, the structure of the ground terminal GND will be described. In the following description, the directions of the front-back, left-right, and up-down arrows shown in fig. 5 are 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 the claims) disposed outside the sealing member a; a base portion 22 connected by bending in a substantially vertical direction from the external connection portion 21; three arm portions 23U, 23V, 23W branched and connected in three directions from the base portion 22; and three internal connection portions 24U, 24V, 24W (corresponding to "a plurality of second connection portions" described in the claims) disposed at the distal ends of the three arm portions 23U, 23V, 23W, respectively. The external connection portion 21 is connected to a substrate or the like (corresponding to a "first connection target portion" described in the claims) other than the substrate X. The three internal connection portions 24U, 24V, 24W are connected to the ground wiring portions 10U, 10V, 10W (corresponding to "a plurality of second connection target portions" described in the claims) on the substrate X, respectively. Hereinafter, the three arm portions 23U, 23V, 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, 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-like member extending in the up-down 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 has a T-shape in plan view widening in the left-right direction.

The three arm portions 23U, 23V, 23W are elongated plate-like members connected to the widened distal end portion of the base portion 22 and extending forward. The circumferences (width and thickness) of the cross sections of the three arm portions 23U, 23V, 23W are equal, respectively. The first arm 23U is connected to the base 22 at a position on the left end side of the front end. The first arm portion 23U includes a rear arm portion extending forward from the base portion 22, a middle arm portion extending obliquely forward to the left 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. The front end of the front arm portion of the first arm portion 23U is bent obliquely downward, and a flat plate-shaped first internal connection portion 24U connected to the front end portion thereof and extending forward is provided.

The second arm 23V is connected to the center of the front end of the base 22. The second arm portion 23V includes, as with the first arm portion 23U, a rear arm portion extending forward from the base portion 22, a middle arm portion extending obliquely forward to the left 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. The front end of the front arm portion of the second arm portion 23V is bent obliquely downward, and a flat second internal connection portion 24V is provided, which is connected to the front end portion thereof and extends forward. The second arm 23V extends from the rear arm to the front arm in parallel with the first arm 23U at a position adjacent to the right side of the first arm 23U. The second internal connection portion 24V provided at the front end of the second arm portion 23V is arranged in parallel with the first internal connection portion 24U at a position adjacent to the right side of the first internal connection portion 24U provided at the front end of the first arm portion 23U.

The third arm 23W is connected to the right end side of the distal end portion of the base 22. The third arm portion 23W has: a rear arm portion extending forward from the base portion 22, a first middle arm portion extending obliquely 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 obliquely 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 is bent obliquely downward at its front end side, and a flat third internal connection portion 24W is provided, which is connected to the front end portion of the second front arm portion and extends forward. 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. The third internal connection portion 24W provided at the front end of the third arm portion 23W is arranged in parallel with the second internal connection portion 24V at a position apart from the right of the second internal connection portion 24V provided at the front end of the second arm portion 23V.

The ground terminal GND has the same length as the first wiring length L1 from the external connection portion 21 to the first internal connection portion 24U, the second wiring length L2 from the external connection portion 21 to the second internal connection portion 24V, and the third wiring length L3 from the external connection portion 21 to the third internal connection portion 24W. At the ground terminal GND, the current paths from the respective internal connection portions 24U, 24V, 24W to the external connection portion 21 meet at the base portion 22, and thus the paths from the intersection points 26 thereof to the external connection portion 21 are common. Therefore, the ground terminal GND can also be said to have the same wiring length from the junction 26 to the three internal connection portions 24U, 24V, 24W.

At the ground terminal GND, the circumferences (widths and thicknesses) of the cross sections of the three arm portions 23U, 23V, 23W are equal to each other, and as described above, the respective inductances from the external connection portion 21 to the three internal connection portions 24U, 24V, 24W are set to the same value (the inductances are equalized) by setting the first to third wiring lengths L1 to L3 to the same length, respectively. When the wiring length of each arm is L, the width of each arm is W, and the thickness of each arm is H, the inductance Ls of each arm can be calculated by the following formula.

[ Formula 1]

As shown in fig. 2 and 4, the lower surface of the first internal 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 internal connection portion 24V is connected to the ground wiring portion 10V of the V-phase region VA, and the lower surface of the third internal 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 (a portion other than a portion on the portion side connected to the external connection portion 21) of the ground terminal GND and the three arm portions 23U, 23V, 23W are arranged inside the sealing member a.

According to the lead terminal GND and the electronic module 1 of the first embodiment, since the respective inductances from the external connection portion 21 to the plurality of internal connection portions 24U, 24V, 24W are equalized, the respective inductances are less susceptible to switching noise from the other second connection portion and the arm portion connected to the other, and it is possible to prevent occurrence of a malfunction such as erroneous on of the switch at an unexpected timing, thereby improving reliability.

In addition, according to the lead terminal GND and the electronic module 1 according to the first embodiment, since it includes: an external connection portion 21 connected to a substrate other than the substrate X or the like; a base portion 22 connected to the external connection portion 21; a plurality of arm portions 23U, 23V, 23W branched from the base portion 22 and connected thereto; and a plurality of internal connection portions 24U, 24V, 24W provided at the distal ends of the plurality of arm portions 23U, 23V, 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. As described above, wiring on the substrate such as the ground bus bar of patent document 1 is not required, and the installation area can be reduced, so that the electronic module can be miniaturized.

Further, according to the lead terminal GND and the electronic module 1 according to the first embodiment, the circumferences of the cross sections of the arm portions 23U, 23V, and 23W are equal, so that the inductance of each arm portion 23U, 23V, and 23W can be equalized with high accuracy, and the reliability can be further improved.

Further, according to the lead terminal 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, 23W and the three internal connection portions 24U, 24V provided at the tip ends of the three arm portions 23U, 23V, 23W, respectively, the lead terminal GND is suitable for connection to the wiring portions (the ground wiring portions 10U, 10V, 10W) of the U-phase region UA, the V-phase region VA, the W-phase region WA, respectively, constituting the circuit for controlling the power supplied to the three-phase motor, the substrate X, and the like.

[ Second embodiment ]

The electronic module according to the second embodiment differs in that the ground terminal GND2 is used instead of the ground terminal GND in the electronic module 1 according to the first embodiment, and the other configuration is the same as that of the electronic module 1 described above. Therefore, in the second embodiment, only the structure of the ground terminal GND2 is described, and other structures are omitted. In the description of the second embodiment, the directions of the front-back, left-right, and up-down arrows shown in fig. 8 are 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 connected to the external connection portion 21 by bending in a substantially vertical direction; two arm portions 23UV, 23W branched from the base portion 22a and connected to each other in two directions; and two internal connection wiring portions 24U, 24W provided at the distal ends 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, 23W will also be referred to as a first arm portion 23UV, a second arm portion 23W. The two internal connection portions 24UV, 24W are also referred to as a first internal connection portion 24UV, a second internal connection portion 24W.

The external connection portion 21 is a plate-like member extending in the up-down 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 and 23W are elongated plate-like members connected to the wide distal end portion of the base portion 22a and extending forward. The perimeter (width and thickness) of the cross section of the two arm portions 23UV, 23W are equal. The first arm portion 23UV is connected to the left end side of the front 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 obliquely forward to the left 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. The front end of the front arm portion of the first arm portion 23UV is bent obliquely downward, and a flat plate-shaped first internal connection portion 24UV connected to the front end thereof and extending forward is provided.

The second arm 23W is connected to the right end side of the distal end portion of the base 22. The second arm portion 23W has a rear arm portion extending forward from the base portion 22a, a first intermediate arm portion extending obliquely forward to the right from the front end of the rear arm portion, a second intermediate arm portion extending forward from the front end of the first intermediate arm portion, a first front arm portion extending obliquely forward to the right from the front end of the second intermediate arm portion, and a second front arm portion extending forward from the front end of the first front arm portion. The front end of the second front arm portion is bent obliquely downward, and a flat plate-shaped second internal connection portion 24W is provided, which is connected to the front end of the second front arm portion and extends forward. 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. The second internal connection portion 24W provided at the front end of the second arm portion 23W is arranged in parallel with the first internal connection portion 24UV at a position apart from the right of the first internal connection portion 24UV provided at the front end of the first arm portion 23 UV.

At the ground terminal GND2, the first wiring length L4 from the external connection portion 21 to the first internal connection portion 24UV and the 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 current paths from the respective internal connection portions 24UV, 24W to the external connection portion 21 meet at the base portion 22a, and thus the paths from the intersection points 27 thereof to the external connection portion 21 are common. Therefore, at the ground terminal GND2, the length of the wiring from the junction 27 to the two internal connection portions 24UV, 24W is the same.

In the ground terminal GND2, the circumferences (widths and thicknesses) 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 set 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 inductance (the inductances are equalized).

As described above, the structure of the ground terminal GND2 and the lead terminal of the electronic module 2 according to the second embodiment is different from that of the ground terminal GND and the electronic module 1 according to the first embodiment, but the respective inductances from the external connection portion 21 to the plurality of internal connection portions 24UV, 24W are equalized as in the electronic module 1 according to the first embodiment, and therefore are less susceptible to switching noise from other internal connection portions and arm portions connected to other phases. Thus, it is possible to prevent occurrence of a malfunction such as erroneous on of the switch at an unexpected timing, thereby improving reliability.

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

[ Third embodiment ]

The electronic module according to the third embodiment is similar to the electronic module 1 described above, except that the ground terminal GND3 is used instead of the ground terminal GND of the electronic module 1 according to the first embodiment. Therefore, in the third embodiment, only the structure of the ground terminal GND3 is described, and the description of other structures is omitted. In the description of the third embodiment, the directions of the front-back, left-right, and up-down arrows shown in fig. 10 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 connected by bending in a substantially vertical direction from the external connection portion 21; a common lead frame 25 connected to the base portion 22 and extending in a front direction extending in the left-right direction; three arm portions 23U, 23V, 23W branched from the base portion 22 via the common lead frame 25 and connected thereto; and three internal connection portions 24U, 24V, 24W provided at the tip ends of the three arm portions 23U, 23V, 23W, respectively.

The common lead frame 25 is a plate-like member that extends in the left-right direction and extends forward after being connected to the front end portion side of the base portion 22. The common lead frame 25 includes: a rear frame portion extending forward from the base portion 22; a first middle frame part extending forward from the front end of the rear frame part on the right side; a second middle frame which is extended from the front end of the first middle frame part in a cone shape on the right side and is extended in a cone shape on the left side 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 has 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 first switching element Q2 except the vicinity of the gate, most of the third switching element Q8 except a part of the corners, the entire second switching element Q5, 4 on the fourth side X4 of the third switching element Q7, and 4 on the third side X3 of the third switching element Q9.

The three arm portions 23U, 23V, 23W are elongated plate-like members connected to the widened distal end portions of the common lead frame 25 and extending forward. The circumferences (width and thickness) of the cross sections of the three arm portions 23U, 23V, 23W are equal, respectively. The first arm 23U is connected to the position on the left end side of the front end portion of the common lead frame 25. The first arm portion 23U 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 of the front arm portion of the first arm portion 23U is bent obliquely downward, and a flat plate-shaped first internal connection portion 24U connected to the front end portion thereof and extending forward is provided.

The second arm 23V is connected to a position adjacent to the right side of the first arm 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 of the front arm portion of the first arm portion 23U is bent obliquely downward, and a flat second internal connection portion 24V connected to the front end portion thereof and extending forward is provided. The entire portion from the rear arm portion to the front arm portion of the second arm portion 23V is juxtaposed with the entire first arm portion 23U.

The third arm 23W is connected to the 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 of the front arm portion of the third arm portion 23W is bent obliquely downward, and a flat plate-shaped third internal connection portion 24W is provided, which is connected to the front end portion thereof and extends forward.

A common lead frame is provided between the base portion 22 and the three arm portions 23U, 23V, and 23W of the ground terminal GND3 from the external connection portion 21 to the first internal connection portion 24U, from the external connection portion 21 to the second internal connection portion 24V, and from the external connection portion 21 to the third internal connection portion 24W. Therefore, in the ground terminal GND3, since the current paths from the respective internal connection portions 24U, 24V, 24W to the external connection portion 21 are shared in the shared lead frame 25, the paths from the three arm portions 23U, 23V, 23W to the external connection portion 21 are also shared. Therefore, the ground terminal GND3 can be said to have the same wiring length from the three arm portions 23U, 23V, 23W to the three internal connection portions 24U, 24V, 24W.

In the ground terminal GND3, the circumferences (widths and thicknesses) of the cross sections of the three arm portions 23U, 23V, 23W are equal to each other, and as described above, by making the lengths from the three arm portions 23U, 23V, 23W to the external connection portion 21 equal to each other, it is achieved that the inductances from the external connection portion 21 to the three internal connection portions 24U, 24V, 24W are set to be the same inductance (i.e., the inductances are equalized).

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 respective inductances from the external connection portion 21 to the plurality of internal connection portions 24U, 24V, 24W are equalized as in the ground terminal GND and the electronic module 1 according to the first embodiment, and are therefore less susceptible to switching noise from other internal connection portions and arm portions connected to other. Thus, it is possible to prevent occurrence of a malfunction such as erroneous on of the switch at an unexpected timing, thereby improving reliability.

In addition, according to the electronic module and the ground terminal GND 3 of the third embodiment, since the three arm portions 23U, 23V, 23W have the common lead frame 25 formed between them and the base body 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 by the common lead frame 25, thereby blocking electromagnetic noise emitted from the electronic components.

In addition, according to the electronic module and the ground terminal GND3 according to the third embodiment, since the common lead frame 25 formed between the three arm portions 23U, 23V, 23W and the base portion 22 is provided, the resistance component and the inductance can be reduced as compared with the elongated arm portions 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 have the effects associated with the electronic module 1 and the ground terminal GND according to the first embodiment.

The present invention has been described based on the above embodiments, but the present invention is not limited to the above embodiments. The present invention can be implemented in various ways within a range not departing from the gist of the present invention, and for example, the following modifications can be made.

The shape, position, size, and the like described in the above embodiments are merely examples, and may be changed within a range that does not impair the effects of the present invention.

In each of the above embodiments, in the ground terminal, the peripheral length (width and thickness) of each arm section is set to be equal, and the wiring lengths from the external connection portion to the plurality of internal connection portions are set to be equal, so that the inductances from the external connection portion to the plurality of internal connection portions are equalized. However, the inductance may be equalized by appropriately adjusting the perimeter of the arm section and the length of each of the wires from the external connection portion 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 perimeter (width and thickness) of the arm section may also be unequal.

For example, as shown in fig. 11, although the first to third wiring lengths L1 to L3 of the three arm portions 23U, 23V, 23W are the same length, 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 foregoing 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 width of the first and second arm portions 23U, 23V. At this time, the inductance may not be equalized by making the width of the third arm portion 23W smaller than the thicknesses 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 the thickness. In addition, the inductance may be equalized by increasing the width and the thickness at the same time. 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 terminals other than the ground terminal.

[ Symbolic description ]

1 … Electronic modules; 10U, 10V, 10W, 10VW … ground wiring sections; 21 … external connection parts (first connection parts); 22. 22a … base portion; 23U, 23V, 23W, 23UV … arm; 24U, 24V, 24W, 24UV … internal connections (second connections); 25 … share a leadframe; GND, GND2, GND3, GND4, GND5, GND6, GND7 … lead terminals (ground terminals).

Claims

1. An electronic module, comprising:

A substrate;

A sealing member; and

The lead terminal is provided with a plurality of lead terminals,

Wherein, the lead terminal includes:

a first connection part connected to the first connection object part;

A base portion connected to the first connection portion;

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

A plurality of second connection parts respectively arranged at the front end parts of the plurality of arm parts and respectively connected with a plurality of second connection object parts,

Wherein respective inductances from the first connection portion to the plurality of second connection portions are equalized,

The first connection portion is exposed to the outside of the sealing member,

The arm portion and the second connection portion are both disposed inside the sealing member, the plurality of second connection target portions are provided on the substrate,

The substrate is provided with a U-phase region, a V-phase region and a W-phase region,

The U-phase region, the V-phase region, and the W-phase region on the substrate are each provided with a wiring portion as the second connection target portion,

The plurality of second connection portions of the lead terminal are connected to the wiring portions as the second connection target portions of the U-phase region, the V-phase region, and the W-phase region on the substrate, respectively.