JP6595924B2 - Composite electronic components - Google Patents

Description

  The present invention relates to a composite electronic component in which an LC circuit is formed by mounting a coil and a capacitor on a bus bar constituting a lead frame.

  Patent Document 1 discloses a conventional example of this type of composite electronic component. In this composite electronic component, a coil and a capacitor are mounted on a circuit body, and two bus bars connected to both terminal lead wires of the coil are connected to an external connection terminal in a state of running parallel to each other.

JP-A-2-37813

  By the way, the two bus bars connected to both terminal lead wires of the coil are running side by side in close proximity to each other. However, if the length of the parallel running section is increased, the mutual inductance increases and the noise resistance performance deteriorates. is there.

  In consideration of the above circumstances, the present invention can shorten the parallel section of the two bus bars connected to the two terminal lead wires of the coil, thereby reducing the mutual inductance between the two bus bars in the parallel section. An object of the present invention is to provide a composite electronic component with improved anti-noise performance.

  In order to solve the above-described problem, the composite electronic component according to the first aspect of the present invention is configured such that the first, second, and third bus bars that are non-conductive with each other are arranged on the same plane, The first bus bar is disposed on one end side, and the second bus bar and the third bus bar are disposed on the other end side in the component length direction in a state in which the band plate portions run side by side, A terminal portion for external connection is provided at one end portion of one bus bar in the component length direction and each other end portion of the second bus bar and the third bus bar in the component length direction, and the second bus bar. One end portion of the first bus bar is integrally formed with a wide plate portion positioned between the other end portion of the first bus bar and the one end portion of the third bus bar. A capacitor is connected between one end of the wide plate of the bus bar and both windings of the coil The end lead wire is connected to a portion on one end side of each strip plate portion of the second bus bar and the third bus bar that run side by side at a position on the other end side in the component length direction of the coil. It is a feature.

  In the composite electronic component according to claim 1, the two end lead wires of the coil winding of each of the band plate portions that run parallel to each other of the second bus bar and the third bus bar at a position on the other end side in the coil component length direction. Since it is connected to the one end side portion, the length of the parallel section of the second bus bar and the third bus bar can be reduced, and the length of the wide plate portion of the second bus bar can be increased. Therefore, the mutual inductance between the strips of both bus bars can be reduced by reducing the length of the parallel running section of the second bus bar and the third bus bar. Moreover, the inductance of a wide board part can be made small by taking the length of the wide board part of a 2nd bus bar. As a result, it is possible to improve the anti-noise performance.

  The invention according to claim 2 is the composite electronic component according to claim 1, wherein the wide plate portion of the second bus bar is a main portion of the mounting arrangement portion of the coil in which a winding is applied to an annular core, The coil is arranged in a state where a main part is positioned on a wide plate part of the second bus bar.

  In the composite electronic component according to claim 2, since the annular coil is arranged with the main portion positioned on the wide plate portion of the second bus bar, the heat of the coil is more efficient than the wide plate portion of the second bus bar. It can dissipate heat well.

  The invention according to claim 3 is the composite electronic component according to claim 1, wherein the second bus bar and the third bus bar are arranged on the other end side in the component length direction of the first bus bar. It is characterized by being arranged to fit within the same width dimension as the bus bar.

  In the composite electronic component of claim 3, the second bus bar and the third bus bar are arranged on the other end side in the component length direction of the first bus bar so as to be within the same width dimension as the first bus bar. Therefore, the composite electronic component can be made more compact.

  According to the present invention, it is possible to shorten the parallel section of the two bus bars connected to the two terminal lead wires of the coil, thereby reducing the mutual inductance between the two bus bars in the parallel section, and anti-noise performance. Can be improved.

It is a perspective view which shows the principal part structure of the composite electronic component of embodiment to this invention. It is a top view of the lead frame currently used for the composite electronic component. It is a figure which shows the difference of the dimensional relationship of the lead frame of a comparative example and embodiment, (a) is a top view of the lead frame of a comparative example, (b) is a top view of the lead frame of embodiment. It is explanatory drawing of the dimension model of the A section of FIG.3 (b). It is explanatory drawing of the dimension model of the B section of FIG.3 (b).

  Embodiments of the present invention will be described below with reference to the drawings.

  In the present embodiment, the present invention is applied to a choke coil unit used as a noise filter in a circuit through which a large current flows in a vehicle such as an electric vehicle (EV) or a hybrid vehicle (HEV, a vehicle in which an engine and a motor-generator are combined). A case will be described as an example.

  FIG. 1 is a perspective view showing a configuration of a main part of a composite electronic component of the embodiment, and FIG. 2 is a plan view of a lead frame used in the composite electronic component.

  As shown in FIGS. 1 and 2, the composite electronic component 1 includes a lead frame 10 including three first, second, and third bus bars 20, 30, and 40. The three bus bars 20, 30, 40 are arranged on the same plane in a state of being non-conductive with each other.

  In FIG. 1 and FIG. 2, when the direction indicated by the arrow X is the component length direction and the direction indicated by the arrow Y orthogonal thereto is the component width direction, the first bus bar 20 is disposed on one end side in the component length direction X. The second bus bar 30 and the third bus bar 40 are disposed on the other end side in the component length direction X.

  The first bus bar 20 is formed by bending a strip having a constant width H in a crank shape in the Z direction perpendicular to the XY plane, and extending externally at one end to one end in the component length direction X. Terminal portion 25. Further, the second bus bar 30 and the third bus bar 40 have external connection terminal portions 35 and 45 extending outward from the other end side at the other end portions in the component length direction X, respectively.

  The third bus bar 40 is obtained by bending a band plate having a width dimension equal to or less than ½ of the width H of the first bus bar 20 in a crank shape in the Z direction. The third bus bar 40 is configured as a strip plate portion 42 having the same width as a whole. In addition, the second bus bar 30 has a wide plate portion 31 located between one end portion of the first bus bar 20 and one end portion of the third bus bar 40 on one end side in the component length direction X. On the other end side in the component length direction X, a band plate portion 32 having the same width as the third bus bar 40 is provided.

  The second bus bar 30 and the third bus bar 40 are disposed so as to be within the range of the width dimension H of the first bus bar 20, and the band plate portion 32 of the second bus bar 30 is formed by the third bus bar 30. Forty strip plate portions 42 are arranged in parallel with each other. The wide plate portion 31 of the second bus bar 30 has the same width as the width H of the first bus bar 20, and the length in the component length direction X is set as large as possible. On the other hand, the length in the component length direction X of the strip plate portion 42 of the third bus bar 40 and the strip plate portion 32 of the second bus bar 30 arranged in a positional relationship running parallel to each other is as small as possible. Is set to

  The terminal portion 35 of the second bus bar 30 and the terminal portion 45 of the third bus bar 40 are provided at the ends of the strip plate portions 32 and 42 bent in a crank shape in the Z direction in the component length direction X, respectively. It has been.

  In addition, a projecting piece portion 22 projecting toward the wide plate portion 31 side of the second bus bar 30 is provided at the other end portion of the first bus bar 20 in the component length direction X. Connection holes 23 and 33 are provided in one end portion of the wide plate portion 31 of the second bus bar 30 that is close to and opposed to the protruding piece portion 22. The capacitor 60 is connected between the first bus bar 20 and the second bus bar 30 by soldering both terminals to the connection holes 23 and 33.

  The wide plate portion 31 of the second bus bar 30 is a main portion of the mounting arrangement portion of the coil 50 in which the winding 52 is applied to the annular core 51, and the coil 50 has its axis line oriented in the Z direction. In the posture, the main portion is positioned on the wide plate portion 31 of the second bus bar 30, and the remaining portions are positioned on the band plate portions 32 and 42 of the second bus bar 30 and the third bus bar 40. It is arranged in the state.

  At one end in the component length direction X of the strip plate portion 32 of the second bus bar 30 and the strip plate portion 42 of the third bus bar 40 that run parallel to each other, there are joint holes 34 and 44 penetrating in the Z direction, respectively. Is provided. The coil 50 has both terminal lead wires of the winding 52 arranged at the position on the other end side in the component length direction X. The both terminal lead wires of the winding 52 are connected to the second bus bar 30 and the third The second bus bar 30 and the third bus bar 40 are connected by solder bonding to the bonding holes 34 and 44 of the bus bar 40. Thereby, an LC circuit is formed between the terminal portions 25, 35 and 45.

  In this composite electronic component 1, the annular coil 50 is arranged with the main portion positioned on the wide plate portion 31 of the second bus bar 30, and both terminal lead wires of the winding 52 of the coil 50 are connected to the coil 50. On the other end side in the component length direction X, the second bus bar 30 and the second bus bar 30 and the third bus bar 40 are connected to the one end side portions of the strip plate portions 32 and 42, respectively. The length in the component length direction X of the strip plate portions 32 and 42 of the third bus bar 40 running side by side is reduced, and the length in the component length direction X of the wide plate portion 31 of the second bus bar 30 is set larger. can do.

  Therefore, since the length of the strip plate portions 32 and 42 of the second bus bar 30 and the third bus bar 40 can be reduced, the mutual inductance between the strip plate portions 32 and 42 can be reduced. Moreover, since the length of the wide strip plate portion 31 of the second bus bar 30 can be set large, the inductance of the wide plate portion 31 can be reduced. As a result, noise resistance can be improved.

  Further, since the annular coil 50 is disposed with the main portion positioned on the wide plate portion 31 of the second bus bar 30, the heat of the coil 50 is more efficient than the wide plate portion 31 of the second bus bar 30. It can dissipate heat.

  Further, the second bus bar 30 and the third bus bar 40 are arranged on the other end side in the component length direction X of the first bus bar 20 so as to be within the same width dimension H as the first bus bar 20. Therefore, the composite electronic component 1 can be made more compact.

  Below, the dimension advantage of the lead frame 10 of the composite electronic component 1 of embodiment is demonstrated, referring a comparative example. 3A and 3B are diagrams showing a difference in the dimensional relationship between the lead frame of the comparative example and the embodiment, FIG. 3A is a plan view of the lead frame of the comparative example, and FIG. 3B is a plan view of the lead frame of the embodiment. FIG.

  As in the lead frame 110 of the comparative example of FIG. 3A, when the lead-out positions of both terminal lead wires of the coil 50 are on the first bus bar 20 side (the actual arrangement position of the coil 50 is not shown). First, the second bus bar 130 and the third bus bar 140 should be extended to the first bus bar 20 side to provide the joint holes 134 and 144. Therefore, the parallel section B of the second bus bar 130 and the third bus bar 140 becomes long.

  On the other hand, as in the lead frame 10 of the embodiment of FIG. 3B, the lead-out position of both terminal lead wires of the winding of the coil 50 is opposite to the first bus bar 20 (the other end side in the component length direction). ) (The actual arrangement position of the coil 50 is not shown), and the lengths of the second bus bar 30 and the third bus bar 40 are set to be short, and the joint holes 34 of both terminal lead wires of the coil 5 are used. , 44 can be provided. Accordingly, the length in the component length direction of the wide plate portion 31 provided on one end side of the second bus bar 30 can be set longer.

  Therefore, the mutual inductance between the strip plate portions 32 and 42 of the second bus bar 30 and the third bus bar 40 can be reduced, and the inductance of the wide plate portion 31 of the second bus bar 30 can be reduced. As a result, noise resistance can be improved.

  For example, the inductance L of the wide plate portion 31 of the second bus bar 30 can be obtained by the following formula 1. However, as shown in the model diagram of FIG. 4, a is the width of the wide plate portion 31, b is the thickness, and l is the length. Further, μ0 is a dielectric constant in vacuum.

上記の数式１から、「ａ」と「ｌ」が大きくなることで、Ｌが小さくなることが言える。

From Equation 1 above, it can be said that L increases as “a” and “l” increase.

  Further, the mutual inductance M between the strip plate portions 32 and 42 in the parallel running section of the second bus bar 30 and the third bus bar 40 can be obtained by the following formula 2. However, as shown in the model diagram of FIG. 5, a is the width of the strip portions 32, 42, b is the thickness, l is the length of the parallel section, and d is the size of the gap between the strip portions 32, 42. It is.

但し、上記の数式２におけるＩｎｋの値は、ａ／ｂ＝０のとき、

However, the value of Ink in Equation 2 above is when a / b = 0.

を採用する。

Is adopted.

  When a / b = 0.1,

を採用する。

Is adopted.

  When a / b = 1.0,

を採用する。

Is adopted.

  Also, from Equation 2, it can be said that M decreases as “l” decreases.

  In addition, according to the said embodiment, although the coil is arrange | positioned adjacently on the wide board part of the 2nd bus bar, you may arrange | position a coil away from the wide board part of the 2nd bus bar.

  Further, according to the embodiment, the second bus bar and the third bus bar are formed so as to fit within the same width dimension as the first bus bar, but are larger than the width dimension of the first bus bar. You may form as follows.

DESCRIPTION OF SYMBOLS 1 Composite electronic component 20 1st bus bar 25 Terminal part 30 2nd bus bar 31 Wide board part 32 Band board part 35 Terminal part 40 3rd bus bar 42 Band board part 45 Terminal part 50 Coil 51 Core 52 Winding 60 Capacitor H Width X Parts length direction

Claims (3)

The first, second, and third bus bars that are non-conductive with each other are arranged on the same plane,
The first bus bar is arranged on one end side in the component length direction,
The second bus bar and the third bus bar are arranged on the other end side in the component length direction in a state in which the strip portions are run side by side,
Terminal portions for external connection are respectively provided at one end in the component length direction of the first bus bar and each other end in the component length direction of the second bus bar and the third bus bar,
A wide plate portion positioned between the other end portion of the first bus bar and the one end portion of the third bus bar is integrally formed at one end portion of the second bus bar,
A capacitor is connected between the other end of the first bus bar and one end of the wide plate of the second bus bar;
Both terminal lead wires of the coil winding are respectively connected to one end side portions of the strip plate portions of the second bus bar and the third bus bar that run parallel to each other at a position on the other end side in the component length direction of the coil. A composite electronic component characterized by being connected. The composite electronic component according to claim 1,
The wide plate portion of the second bus bar is a main portion of the coil mounting arrangement portion in which a coil is wound around an annular core, and the coil is positioned on the wide plate portion of the second bus bar. A composite electronic component, characterized in that the composite electronic component is arranged in a state of being allowed to move. The composite electronic component according to claim 1,
The second bus bar and the third bus bar are arranged on the other end side in the component length direction of the first bus bar so as to fit within the same width dimension as the first bus bar. Composite electronic parts.

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