Lead terminal and electronic module

Abstract

To provide a lead terminal that can be highly reliable and can be easily miniaturized.SOLUTION: A lead terminal GND includes a first connection unit 21 connected to a first connection target unit, a base unit 22 connected to the first connection unit 21, a plurality of arms 23U, 23V, and 23W that is branched and connected from the base unit 22, a plurality of second connection units 24U, 24V, and 24W provided at the tips of the plurality of arms 23U, 23V, and 23W, respectively, and connected to a plurality of second connection target units 10U, 10V, and 10W, respectively, and the inductances from the first connection unit 21 to the plurality of second connection units 24U, 24V, and 24W are equalized.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a lead terminal and an electronic module. [Background technology]

[0002] Conventionally, an electronic module that converts DC power input from a DC power source into AC power and outputs the AC power is known (see, for example, Patent Document 1). In the electronic module described in Patent Document 1, a first phase region in which a circuit connected to a first motor terminal is configured, a second phase region in which a circuit connected to a second motor terminal is configured, and a third phase region in which a circuit connected to a third motor terminal is configured are respectively formed on a substrate, and a wiring portion is provided on the substrate. In addition, one ground bus bar is provided on the substrate along the long side of the substrate. The first phase region, the second phase region, and the third phase region each include a first switch element, a second switch element connected in series with the first switch element, and a third switch element connected to the connection point of the first switch element and the second switch element. The three third switch elements are each connected to the ground bus bar via a clip lead, wiring on the substrate, and a shunt resistor. A ground terminal connected to the ground bus bar is provided at the center of the long side of the ground bus bar. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-197985 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electronic module described in Patent Document 1, the three third switch elements are each connected to a ground bus bar via a ground terminal (lead terminal), wiring on the circuit board, and a shunt resistor, and the ground terminal is provided at the center of the long side of the ground bus bar. Therefore, the wiring length from the external connection part of the ground terminal to the connection part of the ground bus bar with the shunt resistor differs for each phase, and the inductance differs for each phase, making the electronic module susceptible to switching noise from other phases. Another problem with the electronic module described in Patent Document 1 is that an area is required on the circuit board to install the ground bus bar, making it difficult to miniaturize the electronic module.

[0005] The present invention has been made to solve the above problems, and has an object to provide a lead terminal that, when applied to an electronic module, can increase reliability and enable the electronic module to be miniaturized, and also to provide an electronic module using such a lead terminal. [Means for solving the problem]

[0006] The lead terminal of the present invention includes a first connection portion (e.g., external connection portion 21 in the first embodiment) connected to a first connection object portion, a base portion connected to the first connection portion, a plurality of arm portions branching off and connecting from the base portion, and a plurality of second connection portions (e.g., internal connection portions 24U, 24V, 24W in the first embodiment) respectively provided at the tip portions of the plurality of arm portions and connected to a plurality of second connection object portions (e.g., ground wiring portions 10U, 10V, 10W in the first embodiment).The lead terminal is characterized in that the inductances from the first connection portion to the plurality of second connection portions are equalized.

[0007] The electronic module of the present invention includes a substrate and the lead terminal having the above-described configuration, and the plurality of second connection target portions are provided on the substrate. [Effects of the Invention]

[0008] According to the lead terminal and electronic module of the present invention, the inductance from the first connection portion to the plurality of second connection portions is equalized, so that when the lead terminal is mounted on an electronic module, it is less susceptible to the effects of switching noise from other second connection portions and arm portions connected to other phases. This makes it possible to prevent malfunctions such as switching on at unintended times, thereby improving reliability.

[0009] Furthermore, the lead terminal and electronic module of the present invention include a first connection portion connected to a first connection target portion, a base portion connected to the first connection portion, a plurality of arms branching off and connecting from the base portion, and a plurality of second connection portions provided at the tips of the arms, respectively, and connected to a plurality of second connection target portions, so that when the lead terminal is mounted on the electronic module, the first connection portion can be directly connected to wiring on the board via the base portion, the arms, and the second connection portions. Therefore, wiring on the board such as the ground bus bar of Patent Document 1 is not required, and the installation area can be reduced, allowing the electronic module to be made smaller. [Brief explanation of the drawings]

[0010] [Figure 1] 1A and 1B are perspective views of an electronic module 1 according to a first embodiment, in which (a) is a perspective view from above the electronic module 1, and (b) is a perspective view of the electronic module 1 with the bottom side facing up. [Figure 2] FIG. 1 is a plan view shown for explaining an electronic module 1 according to a first embodiment. [Figure 3] 1 is a plan view showing the arrangement of wiring, switch elements, and connectors on a substrate in an electronic module 1 according to a first embodiment. [Figure 4] 1 is a plan view showing the relationship between the electronic module 1 according to the first embodiment and the ground terminal GND. [Figure 5] 1A and 1B are diagrams showing a ground terminal GND according to the first embodiment, in which (a) is a plan view of the ground terminal GND and (b) is a perspective view from above of the ground terminal GND. [Figure 6]1 is a circuit diagram showing a circuit configuration of an electronic module 1 according to a first embodiment. [Figure 7] 10 is a plan view showing the relationship between an electronic module 2 according to a second embodiment and a ground terminal GND2. FIG. [Figure 8] 10A and 10B are diagrams showing a ground terminal GND2 according to a second embodiment, in which (a) is a plan view of the ground terminal GND2 and (b) is a perspective view from above of the ground terminal GND2. [Figure 9] FIG. 10 is a plan view shown for explaining an electronic module 3 according to a third embodiment. [Figure 10] 10A and 10B are diagrams showing a ground terminal GND3 according to a third embodiment, in which (a) is a plan view of the ground terminal GND3 and (b) is a perspective view from above of the ground terminal GND3. [Figure 11] 10A and 10B are diagrams showing a ground terminal GND4 according to a first modified example, in which (a) is a plan view of the ground terminal GND4 and (b) is a perspective view from below of the ground terminal GND4. [Figure 12] 10A and 10B are diagrams showing a ground terminal GND5 according to a second modified example, in which (a) is a plan view of the ground terminal GND5 and (b) is a perspective view from below of the ground terminal GND5. [Figure 13] 10A and 10B are diagrams showing a ground terminal GND6 according to a third modified example, in which (a) is a plan view of the ground terminal GND6 and (b) is a perspective view from below of the ground terminal GND6. [Figure 14] 10A and 10B are diagrams showing a ground terminal GND7 according to a fourth modified example, where FIG. 10A is a plan view of the ground terminal GND7 and FIG. 10B is a perspective view of the bottom of the ground terminal GND7. DETAILED DESCRIPTION OF THE INVENTION

[0011] The lead terminal and electronic module of the present invention will be described below with reference to the drawings. Note that the drawings are schematic diagrams and do not necessarily reflect the actual dimensions. The embodiments described below do not limit the invention according to the claims. Furthermore, not all of the elements and combinations thereof described in each embodiment are necessarily essential to the solution of the present invention. In each embodiment, the same reference numerals are used across embodiments for configurations and elements that have the same basic configuration, features, functions, etc. (including components that are not completely identical in shape, etc.), and repeated description may be omitted.

[0012] [First embodiment] 2 and 3, the electronic module 1 according to the first embodiment is an electronic module for controlling power supplied from a power supply to a three-phase motor. The electronic module 1 includes a substrate X, three first switch elements Q1 to Q3, three second switch elements Q4 to Q6, three third switch elements Q7 to Q9, three first connectors CL1 to CL3, three second connectors CL4 to CL6, three third connectors CL7 to CL9, three fourth connectors CL10 to CL12, three fifth connectors CL13 to CL15, three sixth connectors CL16 to CL18, three shunt resistors R1 to R3, a thermistor RT, a power supply terminal VCC, three motor terminals U, V, and W, a ground terminal GND, a plurality of signal terminals 30, and a sealing member A. 1, the electronic module 1 is sealed with a sealing member A except for the external connection portion of each terminal that is connected to another substrate or the like, and a metal plate 11 on the back surface of the substrate X. In the first embodiment, an embodiment in which the present invention is applied to a ground terminal GND as an example of a lead terminal according to the present invention will be described.

[0013] The substrate X is, for example, an insulating substrate such as a ceramic substrate. The substrate X has a rectangular shape having two opposing long sides (hereinafter referred to as a first side X1 and a second side X2) and two opposing short sides (hereinafter referred to as a third side X3 and a fourth side X4). One surface (hereinafter referred to as the front surface S) of the substrate X is provided with a plurality of wiring sections formed by attaching metal plates, and the other surface (rear surface) of the substrate X has a metal plate 11 for heat dissipation attached thereto. Specifically, on the front surface S of the substrate X, a rectangular power supply wiring section 12 is provided at a position on the second side X2 side, extending along the second side X2 from the vicinity of the third side X3 to the vicinity of the fourth side X4. The power supply wiring section 12 has an L-shaped portion that extends to the first side X1 at a position between the first gate wiring section 16V and the output wiring section 14W described later, and its end side extends along the first side X1 to the fourth side X4.

[0014] On the surface S of the substrate X, 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 at positions on the first side X1 adjacent to the power supply wiring portion 12. The central wiring portion 13U extends from the second side X2 toward the first side X1, with its end portion extending toward the third side X3, forming an L-shape, and is provided at a position adjacent to the third side X3. The central wiring portions 13V and 13W each extend from the second side X2 toward the first side X1, with its end portion extending toward the fourth side X4, forming an L-shape. The central wiring portion 13W is provided at a position adjacent to the fourth side X4. The central wiring portion 13V is provided at approximately the center of the long side of the substrate X.

[0015] Each of the three first gate wiring portions 16U, 16V, and 16W has a rectangular shape extending from the second side X2 to the first side X1. 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 arranged so that the overall shape combined with the L-shaped central wiring portion 13U is rectangular. The first gate wiring portion 16W is provided at a position adjacent to the fourth side X4 and the central wiring portion 13W, and is arranged so that the overall shape combined with the L-shaped central wiring portion 13W is rectangular. The first gate wiring portion 16V is provided at a position adjacent to the central wiring portion 13V, and is arranged so that the overall shape combined with the L-shaped central wiring portion 13V is rectangular.

[0016] Each of the three output wiring sections 14U, 14V, and 14W has a rectangular shape extending from the second side X2 to the first side X1. The two output wiring sections 14U and 14V are provided adjacent to each other between the two central wiring sections 13U and 13V. The output wiring section 14U is provided adjacent to the central wiring section 13U, and the output wiring section 14V is provided adjacent to the central wiring section 13V. The output wiring section 14W is provided adjacent to the central wiring section 13W between the two central wiring sections 13V and 13W.

[0017] On the surface S of the substrate X, three second gate wiring portions 17U, 17V, 17W, three source wiring portions 15U, 15V, 15W, three third gate wiring portions 18U, 18V, 18W, and three ground wiring portions 10U, 10V, 10W are provided at positions on the first side X1 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 at a position adjacent to the third side X3 and extends from the central wiring portion 13U side toward the first side X1 along the third side X3, with its end portion extending along the first side X1 toward the fourth side X4, forming 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 along the fourth side X4 toward the first side X1, with its end portion extending along the first side X1 toward the third side X3, forming an L shape. 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 toward the first side X1.

[0018] The two source wiring portions 15U, 15W have a rectangular shape extending from the second side X2 to the first side X1. The source wiring portion 15U is provided at a position adjacent to the central 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, and has a substantially L-shape with the width on the central wiring portion 13V side being larger than the width on the first side X1 side.

[0019] The third gate wiring portion 18U is provided adjacent to the output wiring portion 14U and extends from the fourth side X4 to the third side X3 along the output wiring portion 14U, with its end portion extending toward the first side X1 along the source wiring portion 15U, forming a substantially L-shape. A notch is provided at the end portion (corner of the L-shape) of the third gate wiring portion 18U on the third side X3 side so as to avoid the central wiring portion 13U. The third gate wiring portion 18V is provided adjacent to the output wiring portion 14V and extends from the third side X3 to the fourth side X4 along the output wiring portion 14V, with its end portion extending toward the first side X1 along the source wiring portion 15V, forming a substantially L-shape. A notch is provided at the end portion (corner of the 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 at a position adjacent to the output wiring portion 14W, and extends from the third side X3 to the fourth side X4 along the output wiring portion 14W, with its end portion extending toward the first side X1 along the source wiring portion 15V, forming a substantially L-shape. A notch is provided at the end portion (corner of the L-shape) of the third gate wiring portion 18W on the fourth side X4 side so as to avoid the central wiring portion 13W.

[0020] The ground wiring section 10U (first ground wiring section) is provided adjacent to the third gate wiring section 18U and has a substantially rectangular shape extending from the third gate wiring section 18U side toward the first side X1. The width of the ground wiring section 10U on the third gate wiring section 18U side is slightly larger than the width on the first side X1 side. The ground wiring section 10V (second ground wiring section) is provided adjacent to the third gate wiring section 18V and the ground wiring section 10U and has a substantially rectangular shape extending from the third gate wiring section 18V side toward the first side X1 along the ground wiring section 10U. The width of the ground wiring section 10V on the third gate wiring section 18V side is slightly larger than the width on the first side X1 side. The ground wiring section 10W (third ground wiring section) is provided adjacent to the third gate wiring section 18W and has a rectangular shape extending from the third gate wiring section 18W side toward the first side X1.

[0021] On the front surface S of the substrate X, three first current detection wiring portions LC1U, LC1V, and LC1W, three second current detection wiring portions LC2U, LC2V, and LC2W, one first thermistor wiring portion LT1, and one second thermistor wiring portion LT2 are provided on the first side X1 side. The first and second thermistor wiring portions LT1 and LT2 are provided side by side in a direction along 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 and LT2 extend from the second gate wiring portion 17V toward the first side X1 and are bent obliquely in a crank shape at their middle portions.

[0022] The first current detection wiring portion LC1U is provided adjacent to the source wiring portion 15U and extends from the second side X2 to the first side X1 along the source wiring portion 15U, with its end portion extending toward the third side X3, forming an L-shape. The end portion of the first current detection wiring portion LC1U on the second side X2 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 and extends from the second side X2 to the first side X1 along the source wiring portion 15V, with its end portion extending toward the fourth side X4, forming an L-shape. The end portion of the first current detection wiring portion LC1V on the second side X2 is connected to the source wiring portion 15V below the shunt resistor R2. The first current detection wiring portion LC1W is provided at a position adjacent to the source wiring portion 15W, and extends along the source wiring portion 15W from the second side X2 to the first side X1, with its end portion extending to the third side X3, forming an L shape. The end portion of the first current detection wiring portion LC1W on the second side X2 is connected to the source wiring portion 15V below the shunt resistor R3.

[0023] The second current detection wiring portion LC2U is provided adjacent to the ground wiring portion 10U and extends from the second side X2 to the first side X1 along the ground wiring portion 10U, with its end portion extending toward the fourth side X4, forming an L-shape. The end portion of the second current detection wiring portion LC2U on the second side X2 is connected to the ground wiring portion 10U below the shunt resistor R1. The second current detection wiring portion LC2V is provided adjacent to the ground wiring portion 10V and extends from the second side X2 to the first side X1 along the ground wiring portion 10V, with its end portion extending toward the third side X3, forming an L-shape. The end portion of the second current detection wiring portion LC2V on the second side X2 is connected to the ground wiring portion 10U below the shunt resistor R2. The second current detection wiring portion LC2W is provided at a position adjacent to the ground wiring portion 10W, and extends along the ground wiring portion 10W from the second side X2 to the first side X1, with its end portion extending toward the third side X3, forming an L shape. The end of the second current detection wiring portion LC2W on the second side X2 is connected to the ground wiring portion 10W below the shunt resistor R3.

[0024] The three first switch elements Q1 to Q3, the three second switch elements Q4 to Q6, and the three third switch elements Q7 to Q9 can each be any suitable switching element, but MOSFETs of the same shape are used in the electronic module 1. The three first connectors CL1 to CL3, the three second connectors CL4 to CL6, the three third connectors CL7 to CL9, the three fourth connectors CL10 to CL12, the three fifth connectors CL13 to CL15, and the three sixth connectors CL16 to CL18 are each formed by bending a plate-shaped conductive member, and have a first connector connected to an electrode on the top surface of each switch element, a second connector connected to a wiring portion on the surface S, and a linking portion connecting the first and second connectors. The linking portion has a generally U-shaped arch shape in cross section to prevent a short circuit between the two wiring portions connected by the connector. The three first connectors CL1 to CL3, the three second connectors CL4 to CL6, and the three third connectors CL7 to CL9 connect the source electrodes of the respective switch elements to the wiring portions on the surface S, and all have the same shape. The first connection portions of these connectors have a width corresponding to the width of the source electrodes, and the second connection portions are narrower than the first connection portions. The three fourth connectors CL10 to CL12, the three fifth connectors CL13 to CL15, and the three sixth connectors CL16 to CL18 connect the gate electrodes of the respective switch elements to the wiring portions on the surface S, and all have the same shape. The first connection portions of these connectors have a width corresponding to the width of the gate electrodes, and the second connection portions are wider than the first connection portions.

[0025] The three first switch elements Q1 to Q3 are each disposed on the power supply wiring section 12. The first switch element Q1 is provided at a position close to the third side X3 on the power supply wiring section 12. The first switch element Q2 is provided at a position approximately in the center of the power supply wiring section 12 in the direction along the second side X2. The first switch element Q3 is provided at a position close to the fourth side X4 on the power supply wiring section 12. Each of the three first switch elements Q1 to Q3 has a source electrode and a gate electrode formed side by side on the front surface side of the switch element, and a drain electrode formed on the back surface side. The first switch element Q1 is provided so that its gate electrode is disposed on the third side X3 side and its drain electrode is connected to the power supply wiring section 12. The source electrode of the first switch element Q1 is connected to the central wiring section 13U via a first connector CL1, and the gate electrode of the first switch element Q1 is connected to the first gate wiring section 16U via a fourth connector CL10. The first switch element Q2 is disposed so that its gate electrode faces the fourth side X4 and its drain electrode is connected to the power supply wiring unit 12. The source electrode of the first switch element Q2 is connected to the central wiring unit 13V via the first connector CL2, and its gate electrode is connected to the first gate wiring unit 16V via the fourth connector CL11. The first switch element Q3 is disposed so that its gate electrode faces the fourth side X4 and its drain electrode is connected to the power supply wiring unit 12. The source electrode of the first switch element Q3 is connected to the central wiring unit 13W via the first connector CL3, and its gate electrode is connected to the first gate wiring unit 16W via the fourth connector CL12.

[0026] The three second switch elements Q4 to Q6 are respectively provided on the central wiring portions 13U, 13V, and 13W at positions on the first side X1. Each of the three second switch elements Q4 to Q6 has a source electrode and a gate electrode formed side by side on the front surface side of the switch element, and a drain electrode formed on the back surface side. The second switch element Q4 is provided so that its gate electrode is located on the third side X3 side and its drain electrode is connected to the central wiring portion 13U. The source electrode of the second switch element Q4 is connected to the source wiring portion 15U via the second connector CL4, and the gate electrode of the second switch element Q4 is connected to the second gate wiring portion 17U via the fifth connector CL13. The second switch element Q5 is provided so that its gate electrode faces the fourth side X4 side and its drain electrode is connected to the central wiring portion 13V. The source electrode of the second switch element Q5 is connected to the source wiring portion 15V via the second connector CL5, and the gate electrode of the second switch element Q5 is connected to the second gate wiring portion 17V via the fifth connector CL14. The second switch element Q6 is provided so that its gate electrode is disposed on the fourth side X4 side and its drain electrode is connected to the central wiring portion 13W. The source electrode of the second switch element Q6 is connected to the source wiring portion 15W via the second connector CL6, and the gate electrode of the second switch element Q6 is connected to the second gate wiring portion 17W via the fifth connector CL15.

[0027] The three third switch elements Q7 to Q9 are respectively provided at approximately the center of the output wiring portions 14U, 14V, and 14W. Each of the three third switch elements Q7 to Q9 has a source electrode and a gate electrode formed side by side on the front surface side of the switch element, and a drain electrode formed on the back surface side. The third switch element Q7 is provided so that its gate electrode faces the first side X1 and its drain electrode is connected to the output wiring portion 14U. The source electrode of the third switch element Q7 is connected to the central wiring portion 13U via the third connector CL7, and its gate electrode is connected to the third gate wiring portion 18U via the sixth connector CL16. The third switch element Q8 is provided so that its gate electrode faces the first side X1 and its drain electrode is connected to the output wiring portion 14V. The source electrode of the third switch element Q8 is connected to the central wiring portion 13V via the third connector CL8, and the gate electrode of the third switch element Q8 is connected to the third gate wiring portion 18V via the sixth connector CL17. The third switch element Q9 is disposed so that its gate electrode faces the first side X1, and its drain electrode is connected to the output wiring portion 14W. The source electrode of the third switch element Q9 is connected to the central wiring portion 13W via the third connector CL9, and the gate electrode of the third switch element Q9 is connected to the third gate wiring portion 18W via the sixth connector CL18.

[0028] The three shunt resistors R1 to R3 are provided at positions on the first side X1 of the source wiring portions 15U, 15V, and 15W and the ground wiring portions 10U, 10V, and 10W, respectively, straddling the source wiring portions 15U, 15V, and 15W and the ground wiring portions 10U, 10V, and 10W. The shunt resistor R1 is provided straddling so as to connect the source wiring portion 15U and the ground wiring portion 10U. The shunt resistor R2 is provided straddling so as to connect the source wiring portion 15V and the ground wiring portion 10V. The shunt resistor R3 is provided straddling so as to connect the source wiring portion 15W and the ground wiring portion 10W.

[0029] The thermistor RT is provided across the end of the first thermistor wiring portion LT1 on the second side X2 side and the end of the second thermistor wiring portion LT2 on the second side X2 side.

[0030] The power supply terminal VCC, the three motor terminals U, V, and W, the ground terminal GND, and the signal terminals 30 are all formed by processing conductive plate-like members. The power supply terminal VCC, the three motor terminals U, V, and W, and the ground terminal GND are arranged so that their external connection portions, which are connected to a substrate other than the substrate X, are aligned along the second side X2 at positions outside the second side X2. Starting from the third side X3, the motor terminals U, V, and W are arranged in this order: motor terminal U, motor terminal V, ground terminal GND, power supply terminal VCC, and motor terminal W. In the following description, the three motor terminals U, V, and W are also referred to as the first motor terminal U, second motor terminal V, and third motor terminal W. The power supply terminal VCC has an external connection portion located outside the sealing member A, a base portion connected to the external connection portion, and an internal connection portion provided at the tip extending from the base portion. The internal connection portion of the power supply terminal VCC is connected to the power supply wiring unit 12 at a position to the side of the first switch element Q2 mounted on the power supply wiring unit 12. The external connection portion of the power supply terminal VCC is disposed at a position that extends from the internal connection portion in the direction of the second side X2 and protrudes to the outside of the sealing member A.

[0031] 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 the tip 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 on the outer side of the second side X2 of the substrate X, closest to the third side X3. The arm portion of the first motor terminal U is bent in a crank shape so that the internal and external connection portions can be positioned as described above.

[0032] 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 the tip 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 outside the second side X2 of the substrate X, to the side of the first motor terminal U. The arm portion of the second motor terminal V is bent in a crank shape so that the internal and external connection portions can be disposed as described above.

[0033] 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 the tip 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 on the outer side of the second side X2 of the substrate X, closest to the fourth side X4. The arm portion of the third motor terminal W is bent in a crank shape so that the internal and external connection portions can be positioned as described above.

[0034] 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; and three third gate signal terminals GTU1, GTU2 connected to the three third gate wiring portions 18U, 18V, 18W, respectively. The circuit board 10 includes TV1, GTW1, a power supply signal terminal VLNKS connected to a portion of the power supply wiring section 12 extending to the first side X1, first and second thermistor terminals RTP, RTN connected to the first and second thermistor wiring sections LT1, LT2, respectively, three first current detection terminals CP1, CP2, CP3 connected to the three first current detection wiring sections LC1U, LC1V, LC1W, respectively, and three second current detection terminals CN1, CN2, CN3 connected to the three second current detection wiring sections LC2U, LC2V, LC2W, respectively. The signal terminals 30 are arranged such that external connection portions of each terminal connected to a substrate or the like other than the substrate X are aligned along the first side X1 at positions outside the first side X1.

[0035] As shown in Figures 2 and 3, on the surface S of the substrate X, a U-phase area UA (first phase area) in which a circuit for controlling the power supplied to the three-phase motor via the motor terminal U is configured, a V-phase area VA (second phase area) in which a circuit for controlling the power supplied to the three-phase motor via the motor terminal V is configured, and a W-phase area WA (third phase area) in which a circuit for controlling the power supplied to the three-phase motor via the motor terminal W is configured are formed side by side in this order from the third side X3 side to the fourth side X4 side.

[0036] Arranged in the U-phase region UA ​​are a first switch element Q1, a first connector CL1, a central wiring portion 13U, a second switch element Q4, a second connector CL4, a source wiring portion 15U, a shunt resistor R1, a ground wiring portion 10U, a third connector CL7, the third switch element Q7, an output wiring portion 14U, a fourth connector CL10, a fifth connector CL13, and a sixth connector CL16. In the U-phase region UA, the power supply terminal VCC is electrically connected to the ground terminal GND via the power supply wiring portion 12, the first connector CL1, the first switch element Q1, the central wiring portion 13U, the second switch element Q4, the second connector CL4, the source wiring portion 15U, the shunt resistor R1, and the ground wiring portion 10U, as shown in FIGS. In addition, the power supply terminal VCC is electrically connected to the motor terminal U from the central wiring section 13U via the third connector CL7, the third switch element Q7, and the output wiring section 14U, thereby forming a control circuit for power supplied from the motor terminal U to the three-phase motor.

[0037] Arranged in the V-phase area VA are a first switch element Q2, a first connector CL2, a central wiring section 13V, a second switch element Q5, a second connector CL5, a source wiring section 15V, a shunt resistor R2, a ground wiring section 10V, a third connector CL8, the third switch element Q8, an output wiring section 14V, a fourth connector CL11, a fifth connector CL14, and a sixth connector CL17. In the V-phase area VA, the power supply terminal VCC is electrically connected to the ground terminal GND via the power supply wiring section 12, the first connector CL2, the first switch element Q2, the central wiring section 13V, the second switch element Q5, the second connector CL5, the source wiring section 15V, the shunt resistor R2, and the ground wiring section 10V. In addition, the power supply terminal VCC is electrically connected to the motor terminal V via the central wiring section 13V, the third connector CL8, the third switch element Q8, and the output wiring section 14V, thereby forming a control circuit for power supplied from the motor terminal V to the three-phase motor.

[0038] Arranged in the W-phase region WA are a first switch element Q3, a first connector CL3, a central wiring portion 13W, a second switch element Q6, a second connector CL6, a source wiring portion 15W, a shunt resistor R3, a ground wiring portion 10W, a third connector CL9, the third switch element Q9, an output wiring portion 14W, a fourth connector CL12, a fifth connector CL15, and a sixth connector 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 connector CL3, the first switch element Q3, the central wiring portion 13W, the second switch element Q6, the second connector CL6, the source wiring portion 15W, the shunt resistor R3, and the ground wiring portion 10W. In addition, the power supply terminal VCC is connected to the motor terminal W via the central wiring section 13W, the third connector CL9, the third switch element Q9, and the output wiring section 14W, thereby forming a control circuit for power supplied from the motor terminal W to the three-phase motor.

[0039] As shown in Figure 3, the circuit configuration within the region indicated by dashed line BL1 in the U-phase region UA ​​and the circuit configuration within the region indicated by dashed line BL2 in the V-phase region VA are arranged symmetrically with respect to the boundary line AX1. Furthermore, the circuit configuration within the region indicated by dashed line BL1 in the U-phase region UA ​​and the circuit configuration within the region indicated by dashed line BL3 in the W-phase region WA are arranged symmetrically with respect to the line AX2 passing through the center of the long side of the substrate X. Furthermore, the circuit configuration within the region indicated by dashed line BL2 in the V-phase region VA and the circuit configuration within the region indicated by dashed line BL3 in the W-phase region WA have the same arrangement.

[0040] Next, the configuration of the ground terminal GND will be described. In the following description, the directions of the front-rear, left-right, and up-down arrows shown in FIG. 5 will be referred to as the front-rear direction, left-right direction, and up-down direction. As shown in FIGS. 4 and 5, the ground terminal GND has an external connection portion 21 (corresponding to the "first connection portion" in the claims) disposed outside the sealing member A, a base portion 22 bent in a direction substantially perpendicular to the external connection portion 21 and connected thereto, three arm portions 23U, 23V, and 23W branching out in three directions from the base portion 22 and connected thereto, and three internal connection portions 24U, 24V, and 24W (corresponding to the "plurality of second connection portions" in the claims) provided at the tips of the three arm portions 23U, 23V, and 23W, respectively. The external connection portion 21 is connected to a substrate or the like (corresponding to the "first connection target portion" in the claims) separate from the substrate X. The three internal connection portions 24U, 24V, and 24W are respectively connected to ground wiring portions 10U, 10V, and 10W (corresponding to "plurality of second connection target portions" in the claims) on the substrate X. Note that, hereinafter, the three arm portions 23U, 23V, and 23W are also referred to as the first arm portion 23U, the second arm portion 23V, and the third arm portion 23W. The three internal connection portions 24U, 24V, and 24W are also referred to as the first internal connection portion 24U, the second internal connection portion 24V, and the third internal connection portion 24W.

[0041] The external connection part 21 is a plate-like member extending in the vertical direction. The base part 22 is a plate-like member that is connected to the lower end of the external connection part 21 and extends forward, and its front end side is T-shaped in plan view, with its width widening in the left-right direction.

[0042] Each of the three arms 23U, 23V, and 23W is a long, plate-like member that is connected to the widened front end of the base 22 and extends forward. The three arms 23U, 23V, and 23W have the same cross-sectional perimeter (width and thickness). The first arm 23U is connected to the left end of the front end of the base 22. The first arm 23U has a rear arm that extends forward from the base 22, a middle arm that extends diagonally forward and left from the front end of the rear arm, and a forearm that extends forward from the front end of the middle arm. The front end side of the forearm of the first arm 23U is bent diagonally downward, and a flat, plate-like first internal connection part 24U is provided that is connected to the front end and extends forward.

[0043] The second arm 23V is connected to the center of the front end of the base unit 22. Similar to the first arm 23U, the second arm 23V has a rear arm extending forward from the base unit 22, a middle arm extending diagonally forward and left from the front end of the rear arm, and a forearm extending forward from the front end of the middle arm. The front end side of the forearm of the second arm 23V is bent diagonally downward, and a flat second internal connection part 24V is provided that is connected to the front end and extends forward. The second arm 23V is located adjacent to the right side of the first arm 23U, and extends entirely parallel to the entire first arm 23U from the rear arm to the forearm. The second internal connection portion 24V provided at the front end of the second arm portion 23V is positioned adjacent to the right side of the first internal connection portion 24U provided at the front end of the first arm portion 23U, and is arranged side by side with the first internal connection portion 24U.

[0044] The third arm 23W is connected to the right end of the front end of the base 22. The third arm 23W includes a rear arm extending forward from the base 22, a first middle arm extending diagonally forward and to the right from the front end of the rear arm, a second middle arm extending forward from the front end of the first middle arm, a first forearm extending diagonally forward and to the right from the front end of the second middle arm, and a second forearm extending forward from the front end of the first forearm. The front end of the second forearm is bent diagonally downward, and a flat third internal connection part 24W is provided that is connected to the front end and extends forward. The rear arm of the third arm 23W extends parallel to the rear arm of the second arm 23V, adjacent to the right side of the rear arm of the second arm 23V. The third internal connection portion 24W provided at the front end of the third arm portion 23W is positioned next to the second internal connection portion 24V at a position spaced apart to the right of the second internal connection portion 24V provided at the front end of the second arm portion 23V.

[0045] In the ground terminal GND, 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 are all the same length. In the ground terminal GND, the current paths from the internal connection portions 24U, 24V, and 24W to the external connection portion 21 merge at the base portion 22, and therefore the path from the junction 26 to the external connection portion 21 is common. Therefore, in other words, in the ground terminal GND, the wiring lengths from the junction 26 to the three internal connection portions 24U, 24V, and 24W are all the same length.

[0046] In the ground terminal GND, the cross-sectional perimeters (width and thickness) of the three arms 23U, 23V, and 23W are all equal, and by making the first to third wiring lengths L1 to L3 the same as described above, the inductances from external connection portion 21 to the three internal connection portions 24U, 24V, and 24W are all set to be the same (each inductance is equalized). Note that the inductance Ls of each arm is calculated using the following formula, where L is the wiring length of each arm, W is the width of the arm, and H is the thickness.

number

[0047] 2 and 4, the ground terminal GND configured in this manner has the lower surface of the first internal connection portion 24U connected to the ground wiring portion 10U of the U-phase area UA, the lower surface of the second internal connection portion 24V connected to the ground wiring portion 10V of the V-phase area VA, and the lower surface of the third internal connection portion 24W connected to the ground wiring portion 10W of the W-phase area WA. When the electronic module 1 is sealed with the sealing member A, the ground terminal GND has most of the base portion 22 (excluding a portion connected to the external connection portion 21) and the three arms 23U, 23V, 23W arranged inside the sealing member A.

[0048] According to the lead terminal GND and electronic module 1 of the first embodiment, the inductances from the external connection portion 21 to the multiple internal connection portions 24U, 24V, and 24W are equalized, making them less susceptible to switching noise from other second connection portions and arm portions connected to other phases. This makes it possible to prevent malfunctions such as switching on at unintended times, thereby improving reliability.

[0049] Furthermore, the lead terminal GND and electronic module 1 according to the first embodiment include an external connection portion 21 connected to a substrate other than the substrate X, a base portion 22 connected to the external connection portion 21, a plurality of arm portions 23U, 23V, 23W branching off and connecting from the base portion 22, and a plurality of internal connection portions 24U, 24V, 24W provided at the tips of the plurality of arm portions 23U, 23V, 23W and connected to a plurality of internal connection target portions, respectively. This allows direct connection from the external connection portion 21 to the ground wiring portions 10U, 10V, 10W on the substrate X via the base portion 22, the arm portions 23U, 23V, 23W, and the internal connection portions 24U, 24V, 24W. This eliminates the need for wiring on the substrate such as the ground bus bar in Patent Document 1, thereby reducing the installation area and enabling the electronic module to be miniaturized.

[0050] Furthermore, according to the lead terminal GND and electronic module 1 of the first embodiment, the cross-sectional perimeters of the arms 23U, 23V, and 23W are all equal, so that the inductance of each arm 23U, 23V, and 23W can be equalized with high precision, thereby achieving higher reliability.

[0051] Furthermore, according to the lead terminal GND and electronic module 1 of the first embodiment, the multiple arms are made up of three arms 23U, 23V, and 23W, and have three internal connection parts 24U, 24V, and 24W provided at the tips of the three arms 23U, 23V, and 23W, respectively. Therefore, the lead terminal GND is suitable for connecting the respective wiring parts (ground wiring parts 10U, 10V, and 10W) ​​of the U-phase area UA, V-phase area VA, and W-phase area WA, which constitute a circuit for controlling the power supplied to the three-phase motor, to a substrate other than the substrate X, etc.

[0052] [Second embodiment] The electronic module according to the second embodiment differs from the electronic module 1 according to the first embodiment only in that it includes a ground terminal GND2 instead of the ground terminal GND of the electronic module 1 according to the first embodiment, and the other configurations are the same as those of the electronic module 1. Therefore, in the second embodiment, 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 the front-rear, left-right, and up-down arrows shown in FIG. 8 will be referred to as the front-rear direction, left-right direction, and up-down direction.

[0053] As shown in FIGS. 7 and 8 , the ground terminal GND2 includes an external connection portion 21 disposed outside the sealing member A, a base portion 22a bent in a direction substantially perpendicular to the external connection portion 21 and connected thereto, two arm portions 23UV and 23W branching in two directions from the base portion 22a and connected thereto, and two internal connection portions 24UV and 24W provided at the tips of the two arm portions 23UV and 23W, respectively. The internal connection portion 24UV is connected across two ground wiring portions 10U and 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 will also be referred to as a first arm portion 23UV and a second arm portion 23W. The two internal connection portions 24UV and 24W will also be referred to as a first internal connection portion 24UV and a second internal connection portion 24W.

[0054] The external connection part 21 is a plate-like member extending in the vertical direction. The base part 22a is a plate-like member that is connected to the lower end of the external connection part 21 and extends forward, and its front end side is T-shaped in plan view, with its width widening in the left-right direction.

[0055] The two arms 23UV, 23W are each a long, plate-like member that is connected to the widened front end of the base portion 22a and extends forward. The two arms 23UV, 23W have the same cross-sectional perimeter (width and thickness). The first arm 23UV is connected to the left end of the front end of the base portion 22a. The first arm 23UV has a rear arm that extends forward from the base portion 22a, a middle arm that extends diagonally forward and left from the front end of the rear arm, and a forearm that extends forward from the front end of the middle arm. The front end side of the forearm of the first arm 23UV is bent diagonally downward, and a flat, plate-like first internal connection portion 24UV is provided that is connected to the front end and extends forward.

[0056] The second arm 23W is connected to the right end of the front end of the base 22a. The second arm 23W includes a rear arm extending forward from the base 22a, a first middle arm extending diagonally forward and to the right from the front end of the rear arm, a second middle arm extending forward from the front end of the first middle arm, a first forearm extending diagonally forward and to the right from the front end of the second middle arm, and a second forearm extending forward from the front end of the first forearm. The front end of the second forearm is bent diagonally downward, and a flat second internal connector 24W is provided that is connected to the front end and extends forward. The rear arm of the second arm 23W extends parallel to the rear arm of the first arm 23UV, adjacent to the right side of the rear arm of the first arm 23UV. The second internal connection portion 24W provided at the front end of the second arm portion 23W is positioned next to the first internal connection portion 24UV, spaced apart to the right of the first internal connection portion 24UV provided at the front end of the first arm portion 23UV.

[0057] In the ground terminal GND2, the first wiring length L4 from the external connection portion 21 to the first internal connection portion 24UV is the same as the second wiring length L5 from the external connection portion 21 to the second internal connection portion 24W. In the ground terminal GND2, the current paths from the internal connection portions 24UV, 24W to the external connection portion 21 merge at the base portion 22a, and therefore the path from the junction 27 to the external connection portion 21 is common. Therefore, in other words, in the ground terminal GND2, the wiring lengths from the junction 27 to the two internal connection portions 24UV, 24W are the same.

[0058] In the ground terminal GND2, the cross-sectional perimeters (width and thickness) of the two arm portions 23UV, 23W are equal, and by making the first and second wiring lengths L4, L5 the same as described above, the inductances from the external connection portion 21 to the two internal connection portions 24UV, 24W are set to be the same (each inductance is equalized).

[0059] As described above, the ground terminal GND2 and electronic module 2 according to the second embodiment have a different lead terminal configuration from the ground terminal GND and electronic module 1 according to the first embodiment, but as with the electronic module 1 according to the first embodiment, the inductances from the external connection part 21 to the multiple internal connection parts 24UV, 24W are equalized, making the electronic module 2 less susceptible to switching noise from other internal connection parts and arm parts connected to other phases. This makes it possible to prevent malfunctions such as switching on at unintended times, thereby improving reliability.

[0060] In addition, the electronic module and ground terminal GND2 of the second embodiment have the same configuration as the electronic module 1 and ground terminal GND of the first embodiment except for the configuration of the ground terminal GND, and therefore have the relevant effects of the electronic module 1 and ground terminal GND of the first embodiment.

[0061] [Third embodiment] The electronic module according to the third embodiment differs from the electronic module 1 according to the first embodiment only in that it includes a ground terminal GND3 instead of the ground terminal GND of the electronic module 1 according to the first embodiment, and the other configurations are the same as those of the electronic module 1. Therefore, in the third embodiment, the configuration of the ground terminal GND3 will be described, and the other configurations will be omitted. In the description of the third embodiment, the directions of the front-rear, left-right, and up-down arrows shown in FIG. 10 will be referred to as the front-rear direction, left-right direction, and up-down direction.

[0062] As shown in Figures 9 and 10, the ground terminal GND3 has an external connection portion 21 arranged outside the sealing member A, a base portion 22 bent in a direction approximately perpendicular to the external connection portion 21 and connected to it, a common lead frame 25 connected to the base portion 22 and extending forward and widening in the left-right direction, three arm portions 23U, 23V, and 23W branching off and connected to the base portion 22 via the common lead frame 25, and three internal connection portions 24U, 24V, and 24W provided at the tips of the three arm portions 23U, 23V, and 23W, respectively.

[0063] The external connection part 21 is a plate-like member extending in the vertical direction. The base part 22 is a plate-like member that is connected to the lower end of the external connection part 21 and extends forward, and its front end side is T-shaped in plan view, with its width widening in the left-right direction.

[0064] The common lead frame 25 is a plate-like member that is connected to the front end of the base portion 22 and extends forward in the left-right direction. The common lead frame 25 includes a rear frame portion that extends forward from the base portion 22, a first intermediate frame portion that extends forward from the front end of the rear frame portion while tapering on the right side, a second intermediate frame portion that extends forward from the front end of the first intermediate frame portion while tapering on the right side and also tapering on the left side, and a front frame portion that extends forward from the front end of the second intermediate frame portion. In other words, the common lead frame 25 has a shape that fills the spaces between adjacent arm portions of the three arm portions 23U, 23V, and 23W in the first embodiment. The common lead frame 25 covers most of the first switch element Q2 except for the vicinity of the gate electrode, most of the third switch element Q8 except for some corners, the entire second switch element Q5, about 40% of the third switch element Q7 on the fourth side X4, and about 40% of the third switch element Q9 on the third side X3.

[0065] Each of the three arms 23U, 23V, and 23W is a long, plate-like member that is connected to the widened front end of the common lead frame 25 and extends forward. The three arms 23U, 23V, and 23W have the same cross-sectional perimeter (width and thickness). The first arm 23U is connected to the left end of the front end of the common lead frame 25. The first arm 23U has a rear arm that extends forward from the front end of the common lead frame 25 and a front arm that extends forward from the front end of the rear arm. The front end side of the forearm of the first arm 23U is bent obliquely downward, and a flat first internal connection part 24U is provided that is connected to the front end and extends forward.

[0066] The second arm 23V is connected to a position adjacent to the right side of the first arm 23U at the front end of the common lead frame 25. The second arm 23V has a rear arm extending forward from the front end of the common lead frame 25 and a forearm extending forward from the front end of the rear arm. The front end side of the forearm of the first arm 23U is bent diagonally downward, and a flat second internal connection portion 24V is provided that is connected to the front end and extends forward. The entire second arm 23V from the rear arm to the forearm extends parallel to the entire first arm 23U.

[0067] The third arm 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 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 23W is bent obliquely downward, and a flat third internal connection portion 24W is provided that is connected to the front end portion and extends forward.

[0068] In the ground terminal GND3, a common lead frame 25 is formed between the three arms 23U, 23V, and 23W and the base 22 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, the current paths from the internal connection portions 24U, 24V, and 24W to the external connection portion 21 are common in the common lead frame 25, and therefore the paths from the three arms 23U, 23V, and 23W to the external connection portion 21 are common. Therefore, in other words, in the ground terminal GND3, the wiring lengths from the three arms 23U, 23V, and 23W to the three internal connection portions 24U, 24V, and 24W are the same.

[0069] In the ground terminal GND3, the cross-sectional perimeter (width and thickness) of the three arms 23U, 23V, 23W is the same, and by making the lengths from the three arms 23U, 23V, 23W to the external connection portion 21 the same length as described above, the inductance from the external connection portion 21 to the three internal connection portions 24U, 24V, 24W is set to be the same (each inductance is equalized).

[0070] As described above, the ground terminal GND3 and electronic module 3 according to the third embodiment differ from the ground terminal GND and electronic module 1 according to the first embodiment in that they include a ground terminal GND3 instead of the ground terminal GND. However, as with the ground terminal GND and electronic module 1 according to the first embodiment, the inductances from the external connection part 21 to the multiple internal connection parts 24U, 24V, and 24W are equalized, making them less susceptible to switching noise from other internal connection parts and arm parts connected to other phases. This makes it possible to prevent malfunctions such as the switch being turned on at an unintended timing, thereby improving reliability.

[0071] Furthermore, the electronic module and ground terminal GND3 according to the third embodiment include a common lead frame 25 formed between the three arm portions 23U, 23V, 23W and the base portion 22. This enables the common lead frame 25 to cover the electronic components (first switch element Q2, third switch element Q8, second switch element Q5, third switch element Q7, and third switch element Q9), thereby blocking electromagnetic noise that may be generated from the electronic components.

[0072] Furthermore, the electronic module and ground terminal GND3 of the third embodiment are provided with a common lead frame 25 formed between the three arm portions 23U, 23V, 23W and the base portion 22, and therefore have a smaller resistance component and can reduce inductance compared to when the elongated arm portions branch off from the base portion 22.

[0073] The electronic module and ground terminal GND3 of the third embodiment have the same configuration as the electronic module 1 and ground terminal GND of the first embodiment, except that they have a ground terminal GND3 instead of the ground terminal GND, and therefore have the corresponding effects of the electronic module 1 and ground terminal GND of the first embodiment.

[0074] Although the present invention has been described above based on the above embodiment, the present invention is not limited to the above embodiment and can be embodied in various forms without departing from the spirit of the present invention, and for example, the following modifications are also possible.

[0075] The shapes, positions, sizes, etc. described in the above embodiments are merely examples and can be changed within the scope that does not impair the effects of the present invention.

[0076] In each of the above embodiments, the cross-sectional perimeter (width and thickness) of each arm portion of the ground terminal is equal, and the wiring lengths from the external connection portion to the multiple internal connection portions are equal, thereby equalizing the inductances from the external connection portion to the multiple internal connection portions. However, the cross-sectional perimeter of the arm portion and the wiring lengths from the external connection portion to the multiple internal connection portions may be appropriately adjusted to equalize the inductances. In other words, the wiring lengths from the external connection portion to the multiple internal connection portions and the cross-sectional perimeter (width and thickness) of the arm portions do not have to be equal.

[0077] For example, as shown in Fig. 11, the first to third wiring lengths L1 to L3 of the three arms 23U, 23V, and 23W are the same, but if the width of the third arm 23W is smaller than the widths of the first and second arms 23U and 23V, the thickness of the third arm 23W may be made larger than the thicknesses of the first and second arms 23U and 23V to equalize the inductance. As shown in Fig. 12, the first to third wiring lengths L1 to L3 of the three arms 23U, 23V, and 23W are the same, but if the width of the third arm 23W is larger than the widths of the first and second arms 23U and 23V, the thickness of the third arm 23W may be made smaller than the thicknesses of the first and second arms 23U and 23V to equalize the inductance. The width and thickness values ​​are calculated using the above-mentioned formulas.

[0078] 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 and L2 of the first and second arm portions 23U and 23V, the inductances may be equalized by making the width of the third arm portion 23W smaller than the widths of the first and second arm portions 23U and 23V. In this case, the inductances 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, rather than the width. Furthermore, the inductances may be equalized by making both the width and the thickness smaller. 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 and L2 of the first and second arm portions 23U and 23V, the inductances 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 and 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, rather than by adjusting the thickness. Furthermore, the inductance may be equalized by increasing both the width and the thickness. The values ​​of the width and the thickness are calculated using the above formula. In this way, the inductance may be equalized by adjusting at least one of the width, thickness, and wiring length of the arm portions.

[0079] In the above embodiments, examples have been described in which the lead terminal according to the present invention is applied to a ground terminal, but the lead terminal according to the present invention may also be applied to terminals other than ground terminals. [Explanation of symbols]

[0080] 1...electronic module, 10U, 10V, 10W, 10VW...ground wiring section, 21...external connection section (first connection section), 22, 22a...base section, 23U, 23V, 23W, 23UV...arm section, 24U, 24V, 24W, 24UV...internal connection section (second connection section), common lead frame 25, GND, GND2, GND3, GND4, GND5, GND6, GND7...lead terminal (ground terminal)

Claims

1. a first connection portion connected to the first connection target portion; a base portion connected to the first connection portion; a plurality of arm portions branching out from the base portion; a plurality of second connection portions provided at distal ends of the plurality of arm portions, respectively, and connected to a plurality of second connection target portions, respectively; Equipped with Inductances from the first connection portion to the plurality of second connection portions are equalized, a common lead frame formed between the plurality of arm portions and the base portion; In the common lead frame, when the arm portion side is defined as the front, and when viewed in a plane, one side perpendicular to the direction from the base portion toward the arm portion is defined as the right side, and the side opposite the right side is defined as the left side, the common lead frame has a lead terminal having a rear frame portion extending forward from the base portion, a first middle frame portion extending forward from the front end of the rear frame portion while widening in a tapered shape on the right side, a second middle frame portion extending forward from the front end of the first middle frame portion while widening in a tapered shape on the right side and also widening in a tapered shape on the left side, and a front frame portion extending forward from the front end of the second middle frame portion.

2. The lead terminal according to claim 1 , wherein the inductance is equalized based on the wiring length from the first connection portion to each of the plurality of second connection portions and the circumferential length of the cross section of the plurality of arm portions.

3. 3. The lead terminal according to claim 1, wherein the plurality of arms are made up of three arms, and the lead terminal has three second connection portions provided at the tip ends of the three arms, respectively.

4. A substrate; a plurality of switch elements disposed on the substrate; The lead terminal according to any one of claims 1 to 3, Equipped with the plurality of second connection target portions are provided on the substrate, The common lead frame covers at least some of the plurality of switch elements.

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