JP2006339250A - Common mode choke coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the adjustment of characteristic impedance of common mode choke coil component. <P>SOLUTION: A common mode choke coil component 1 is constituted such that two or more signal wires 2A and 2B for making a pair for common mode choke coil composition are wound to a winding drum 3. The respective signal wires 2A and 2B are composed of two or more conductive twisted wires, respectively. The signal wires 2A and 2B are made a pair in the twisted state, and arranged in parallel so as to carry out winding formation to the winding drum 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a common mode choke coil component that is incorporated in a differential line to attenuate common mode noise.

  FIG. 6 is a schematic perspective view showing an example of a common mode choke coil component. The common mode choke coil component 30 includes a plurality of signal lines 31 (31A, 31B) that are formed by conducting insulation coating on conductive wires, and a winding drum section 32 around which the signal lines 31A, 31B are wound. The flange body 33 is provided with flanges 33 (33A, 33B) provided on both ends of the winding body 32.

  In the configuration of the common mode choke coil component 30, a part of the flange part 33A forms a leg part 34 (34a, 34b), and similarly, a part of the flange part 33B has a leg part 35 (35a, 35b). It is composed. These leg portions 34 (34a, 34b), 35 (35a, 35b) are formed in a manner in which the positions of the projecting tip surfaces are aligned in the same projecting direction from the peripheral surface of the winding drum portion 32, and each leg portion is formed. Electrodes 36 are formed on the projecting tip surfaces of 34 and 35, respectively. One end side of the winding drum portion 32 (for example, the side on which the leg portion 34 is provided) forms the winding start end side, and the other end side of the winding drum portion 32 (for example, the side on which the leg portion 35 is provided). Is the end of the winding.

  The winding start end side of the signal line 31 </ b> A or the signal line 31 </ b> B individually corresponding to the electrode 36 on the protruding tip end surface of each leg portion 34 a, 34 b on the winding start end side of the winding drum portion 32 is drawn from the winding drum portion 32. Is fixed. Similarly, the winding end of the signal line 31A or the signal line 31B corresponding to each of the electrodes 36 on the protruding front end surfaces of the legs 35a and 35b on the winding end end side of the winding drum portion 32 is the winding drum. It is pulled out from the part 32 and is fixed by bonding. The ends of the signal lines 31 </ b> A and 31 </ b> B are bonded and fixed to the electrode 36 with the exposed conductors removed from the coating.

  The common mode choke coil component 30 having such a configuration is interposed, for example, in a differential line 41 formed on a circuit board as shown in a model diagram of FIG. That is, the differential line 41 is provided with a dividing portion 42 as shown in the schematic exploded view of FIG. The common mode choke coil component 30 has a posture in which the electrodes 36 of the legs 34 and 35 are directed toward the differential line 41, and the leg portions corresponding to the line portions on both ends of the dividing part 42 of the differential line 41 are provided. The electrodes 36 of the portions 34 and 35 are joined by, for example, solder 38 and interposed in the differential line 41. As described above, the electrode 36 of the common mode choke coil component 30 is joined and electrically connected to the differential line 41 by, for example, the solder 38, so that the common mode choke coil including the signal lines 31A and 31B is electrically connected. It is interposed in the differential line 41. Thus, the common mode choke coil component 30 incorporated in the differential line 41 attenuates the common mode noise of the differential signal that is energized through the differential line 41.

JP 2003-109836 A JP 2004-63697 A JP-A-7-106138

By the way, when the characteristic impedance Z ₀ of the common mode choke coil component 30 is different from the characteristic impedance Z ₀ ′ of the differential line 41 to be incorporated, the common mode choke coil component 30 and the differential line 41 are joined. In this part, there is a problem that signal reflection occurs or the signal waveform is disturbed. For this reason, in order to avoid such a problem, the impedance adjustment for matching the characteristic impedance Z ₀ of the common mode choke coil component 30 with the characteristic impedance Z _{0 ′} of the differential line 41 is performed.

For example, when the value of the inductance component of the common mode choke coil component 30 is L and the size of the capacitance component of the common mode choke coil component 30 is C, the characteristic impedance Z ₀ of the common mode choke coil component 30 is , Z ₀ = √ (L / C). As a result, the characteristic impedance Z ₀ of the common mode choke coil component 30 is adjusted as follows.

That is, the value of the inductance component of the common mode choke coil component 30 increases as the thickness of the signal line 31 is increased, and conversely decreases as the thickness of the signal line 31 is decreased. Therefore, there is a method of matching the characteristic impedance Z _{0 of the} common mode choke coil component 30 with the characteristic impedance Z _{0 ′} of the differential line 41 by variably adjusting the thickness of the signal line 31.

There is also a method of adjusting the characteristic impedance Z ₀ by changing the capacitance component of the common mode choke coil component 30 instead of the inductance component of the common mode choke coil component 30. For example, the capacitance component of the common mode choke coil component 30 can be varied depending on the distance between the paired signal lines 31A and 31B. For example, as shown in FIG. 8A, the size of the capacitance component of the common mode choke coil component 30 can be increased by narrowing the distance between the pair of signal lines 31A and 31B. Further, as shown in FIG. 8B, the size of the capacitance component of the common mode choke coil component 30 can be reduced by increasing the distance between the paired signal lines 31A and 31B.

As described above, in order to match the characteristic impedance Z ₀ of the differential lines 41 ', it is possible to perform a variable adjustment of the characteristic impedance Z ₀ of the common mode choke coil component 30.

However, the method of adjusting the characteristic impedance Z ₀ of the common mode choke coil component 30 by variably adjusting the thickness of the signal line 31 causes the following problems. For example, if the signal line 31 is made thin, there is a problem that the resistance component of the signal line 31 increases and the signal transmission loss increases. Further, when the signal line 31 is thickened, the number of turns of the signal line 31 that can be wound around the winding body 32 is reduced. Therefore, depending on the required number of windings of the signal line 31, the winding body 32 must be enlarged. That is, the common mode choke coil component 30 may be increased in size. Further, since the signal line 31 is thick, it is difficult to stably place the tip end of the signal line 31 on the electrode 36 in the manufacturing process in which the tip end of the signal line 31 is joined to the electrode 36. There is a possibility that a problem that the operation of joining the tip of the electrode to the electrode 36 becomes complicated is caused.

Further, the method of adjusting the characteristic impedance Z ₀ of the common mode choke coil component 30 by variably adjusting the distance between the signal lines 31A and 31B has the following problems. For example, the signal line 31B is wound as shown in FIG. 8B, rather than the state where the signal lines 31A and 31B are wound around the winding body 32 as shown in FIG. 8A. The capacitance component of the common mode choke coil component 30 can be reduced by winding the signal line 31A to a position shifted to the left side with respect to the turning position to widen the distance between the signal lines 31A and 31B. . However, if the signal line 31A is further shifted to the left side with respect to the winding position of the signal line 31B as shown in FIG. 8C than the state of FIG. 8B in order to further reduce the capacitance component, the signal line 31A is close to the signal line 31B portion one turn before, and the interval between the signal lines 31A and 31B is narrowed. As a result, the capacitance component of the common mode choke coil component 30 is reduced even though it is desired to reduce the capacitance component. growing. Thus, since the variable width of the interval between the signal lines 31A and 31B is narrow, the variable adjustment range of the capacitance component of the common mode choke coil component 30 is narrow, and the characteristic impedance Z ₀ of the common mode choke coil component 30 is adjusted. May not be done satisfactorily.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a common mode choke coil component whose characteristic impedance can be easily adjusted.

In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, the present invention provides a common mode choke coil component having a configuration in which a plurality of signal lines forming a pair for configuring a common mode choke coil are wound around a winding body.
Each signal line is a stranded wire formed by twisting a plurality of conductive wires,
The signal lines forming a pair are wound around a winding body in a twisted state.

Further, the present invention provides a common mode choke coil component having a configuration in which a plurality of signal lines forming a pair for configuring a common mode choke coil are wound around a winding body.
Each signal line is formed as a twisted wire formed by twisting a plurality of conducting wires, and the signal lines forming a pair are also wound around a winding body side by side.

  According to the present invention, the plurality of signal lines forming a pair for constructing the common mode choke coil are each a stranded wire formed by twisting a plurality of conductive wires. For this reason, the magnitude | size (inductance value) of the inductance component of a signal wire | line can be variably adjusted by variably adjusting the frequency | count of twist per unit length of the some conducting wire which comprises a signal wire | line. Moreover, the magnitude | size of the capacitive component (parasitic capacitance) of a signal wire | line can be variably adjusted by variably adjusting the pitch space | interval (twisted looseness degree) of several conducting wire which comprises a signal wire | line. Since the inductance value of the signal line and the size of the capacitance component are one of the factors that determine the characteristic impedance of the common mode choke coil components, the number of twists per unit length and the number of twists per unit length of the signal line By variably adjusting the degree of looseness, the characteristic impedance of the common mode choke coil component can be variably adjusted.

  Furthermore, when the signal wires forming a pair have a configuration in which the signal wires are wound around the winding body in a twisted state, by variably adjusting the number of twists per unit length of the signal wires However, it is possible to variably adjust the inductance value of the paired signal lines (that is, common mode choke coil components). Furthermore, the capacitance component (parasitic capacitance) of the paired signal lines (that is, common mode choke coil components) can be increased by variably adjusting the pitch spacing (twist looseness) of the paired signal lines. The thickness can be variably adjusted.

  In this way, when the signal wires forming a pair of stranded wires have a configuration in which the signal wires are wound around the winding body in a twisted state, the characteristic impedance of the common mode choke coil component is The number of twists per unit length of signal wires and the pitch interval (twist looseness), and the number of twists per unit length of signal wires and the pitch interval (twist looseness) The variable adjustment can be variably adjusted. That is, since there are many elements for variably adjusting the characteristic impedance of the common mode choke coil component, the variable adjustment range of the characteristic impedance of the common mode choke coil component can be widened. This makes it easy to match the characteristic impedance of the common mode choke coil component to the characteristic impedance of the differential line to be incorporated.

  In addition, in the case where a plurality of signal lines forming a pair of stranded wires have a configuration in which the signal lines are wound around the winding body portion, the twists per unit length of the plurality of conductors of each signal line The characteristic impedance of common mode choke coil components can be adjusted by variably adjusting the pitch components of the common mode choke coil components by adjusting the number of pitches and pitch intervals (twist looseness) as well as the pitch intervals of these signal lines. Can be variably adjusted. Also in this case, the variable adjustment range of the characteristic impedance of the common mode choke coil component is widened, and it is easy to match the characteristic impedance of the common mode choke coil component with the characteristic impedance of the differential line to be incorporated. Can do.

  Further, when the signal line is configured to have a plurality of conductors, and the plurality of conductors are merely arranged side by side, the interval between the conductors varies, and the signal line composed of the plurality of conductors The capacitance component of fluctuates. On the other hand, in the present invention, since the signal line is a stranded wire formed by twisting a plurality of conductors, the interval between the plurality of conductors can be made substantially constant, and the variation in the capacitance component of the signal line can be achieved. Can be suppressed. Since the capacitance component of the signal line is related to the characteristic impedance of the common mode choke coil component, the variation of the characteristic component of the common mode choke coil component can be reduced by suppressing the variation of the capacitance component of the signal line as described above. Can be small.

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

  FIG. 1 is a schematic plan view showing a common mode choke coil component according to the first embodiment. The common mode choke coil component 1 of the first embodiment is similar to the common mode choke coil component 30 shown in FIG. 6 and includes signal lines 2 (2A, 2B) forming a pair for common mode choke coil configuration, These signal lines 2A and 2B are configured to have a winding drum portion 3 on which the signal lines 2A and 2B are wound, and flanges 4 (4A and 4B) provided on both ends of the winding drum portion 3, respectively. Further, the flange portions 4A and 4B on both end sides of the winding drum portion 3 are partially formed as legs 5 (5a, 5b) and 6 (6a, 6b), respectively. These leg portions 5a, 5b, 6a, 6b are formed so as to protrude from the peripheral surface of the winding drum portion 3 in the same projecting direction with the positions of the projecting tip surfaces aligned, and each leg portion 5a, 5b, 6a, Electrodes 7 are respectively formed on the front end surfaces of 6b. The ends of the signal lines 2A and 2B corresponding to the electrodes 7 of the legs 5a, 5b, 6a, and 6b are bonded and fixed individually.

  In the first embodiment, as shown in the model diagram of FIG. 2, each signal line 2 </ b> A, 2 </ b> B is composed of a stranded wire formed by twisting a plurality of conducting wires 10. Further, as shown in the model diagram of FIG. 3, the signal lines 2 </ b> A and 2 </ b> B forming a pair are wound around the winding body portion 3 in a twisted state.

The number of twists per unit length of the plurality of conductors 10 of each signal line 2A, 2B is related to the inductance value of each signal line 2A, 2B, and the looseness of the conductors 10 (interval between the plurality of conductors 10). Is related to the magnitude of the capacitance component (parasitic capacitance) of each signal line 2A, 2B. The inductance values and capacitance components of the signal lines 2A and 2B are related to the characteristic impedance Z ₀ of the common mode choke coil component 1. As a result, the characteristic impedance Z ₀ of the common mode choke coil component 1 can be variably adjusted by variably adjusting the number of twists per unit length of the signal wires 2A and 2B and the looseness of the twist. can do.

Further, the number of twists per unit length of the signal lines 2A and 2B forming a pair is related to the inductance value of the common mode choke coil component 1, and the looseness of the twists of the signal lines 2A and 2B is the common mode. This is related to the size of the capacity component of the choke coil component 1. Thus, the characteristic impedance Z ₀ of the common mode choke coil component 1 can be variably adjusted by variably adjusting the number of twists per unit length of the signal lines 2A and 2B and the looseness of the twist. be able to.

As described above, in the first embodiment, the signal impedances of the signal lines 2A and 2B are set so that the characteristic impedance Z ₀ of the common mode choke coil component 1 matches the characteristic impedance of the differential line to be incorporated. The number of twists per unit length and the looseness of the twists of the plurality of conductors 10, and the number of twists per unit length of the signal wires 2A and 2B and the looseness of the twists are adjusted as appropriate by experiments. Is set.

In the first embodiment, as described above, each of the signal lines 2A and 2B is constituted by a stranded wire, and the signal lines 2A and 2B forming a pair are wound around the winding body 3 in a twisted state. Since it is configured to be formed once, the characteristic impedance Z _{0 of the} common mode choke coil component 1 is provided while having a common mode impedance Z _C and a differential mode impedance Z _D that are predetermined to attenuate common mode noise. Can be adjusted toward the set value (that is, the characteristic impedance of the differential line to be incorporated). This has been confirmed by the inventors' experiments. That is, FIG. 4 (a) shows an example of the relationship between the frequency of a signal energizing the common mode choke coil component obtained by the inventor's experiment and the characteristic impedance Z ₀ of the common mode choke coil component. FIG. 4B shows a graph regarding the differential mode impedance Z _D of the common mode choke coil component, and FIG. 4C shows a graph regarding the common mode impedance Z _C of the common mode choke coil component. Yes.

As in the common mode choke coil component 30 of FIG. 6, the signal lines 31 </ b> A and 31 </ b> B are configured by a single conductor, and the signal lines 31 </ b> A and 31 </ b> B forming a pair are wound around the winding body 32. In this case, for example, the common mode choke coil component 30 has a characteristic impedance Z ₀ as shown by a solid line C in FIG. 4A and a differential mode impedance as shown by a solid line C in FIG. 4B. Z _D and a common mode impedance Z _C as shown by a solid line C in FIG. On the other hand, in the case of the common mode choke coil component 1 having a specific configuration in the first embodiment, the common mode choke coil component 1 is as shown by a solid line A in FIG. It has a characteristic impedance Z _0, and has a differential mode impedance Z _{D as} shown by a solid line A in FIG. 4B and a common mode impedance Z _C as shown by a solid line A in FIG. 4C. That is, based on the experimental results, the common mode choke coil component 1 of the first embodiment has the characteristic impedance while having the same differential mode impedance Z _D and common mode impedance Z _C as the common mode choke coil component 30 of FIG. (in this example, about 100 [Omega) characteristic impedance Z ₀ of the object Z ₀ it can be seen that adjustment towards.

  The second embodiment will be described below. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and duplicate descriptions of common portions are omitted.

  In the second embodiment, the signal lines 2A and 2B forming a pair of stranded wires are wound around the winding drum portion 3 in a lined state as shown in the schematic plan view of FIG. Yes. Configurations other than this configuration are the same as those in the first embodiment.

In the second embodiment, the characteristics are obtained by variably adjusting the number of twists per unit length and the looseness of the twist of each signal line 2A, 2B and the pitch interval between the signal lines 2A, 2B. The inductance value and the capacitance component of the common mode choke coil component 1 are variably adjusted so that the impedance Z ₀ becomes a set characteristic impedance.

Also in the second embodiment, as in the first embodiment, the common mode choke coil component 1 having a configuration unique to the second embodiment is indicated by a solid line B in FIGS. As shown in FIG. 6, while having the differential mode impedance Z _D and the common mode impedance Z _C (see the solid line A in FIGS. 4B and 4C) similar to the common mode choke coil component 30 in FIG. than the common mode choke coil component 30, the characteristic impedance of the object characteristic impedance Z ₀ Z ₀ (in this example, about 100 [Omega) can be close to.

  In addition, this invention is not limited to the form of each 1st and 2nd example of an embodiment, Various embodiment can be taken. For example, in each of the first and second embodiments, each signal line 2A, 2B is constituted by a stranded wire formed by twisting two conducting wires 10 as shown in FIG. 2 and FIG. However, the number of the conductive wires 10 constituting each of the signal lines 2A and 2B and the thickness of the conductive material 10 are the resistance value of each of the signal lines 2A and 2B and the signal line 2A wound around the winding drum portion 3. , 2B, the size of the winding body 3 and the like are appropriately designed. That is, the number of conducting wires 10 of each signal line 2A, 2B is not limited to two, and the signal wires 2A, 2B may be configured by two or more stranded wires of the conducting wires 10. Each of the signal lines 2A and 2B may have a configuration in which an insulation coating is applied to a stranded wire formed by twisting a plurality of conducting wires 10 together.

It is a typical top view for demonstrating the common mode choke coil components of the example of 1st Embodiment. It is a model figure for demonstrating the structural example of the signal wire | line which comprises the common mode choke coil components of the example of 1st Embodiment. It is a model figure for demonstrating the form example of the signal wire | line which comprises the pair which comprises the common mode choke coil components of 1st Embodiment. It is a graph for demonstrating the effect acquired from the structure of the common mode choke coil component of the example of 1st Embodiment. It is a typical top view for demonstrating the common mode choke coil components of 2nd Embodiment. It is a model figure for demonstrating one example of a common mode choke coil component. It is a figure for demonstrating an example of the aspect which integrates a common mode choke coil component in a differential track | line. It is a model figure for demonstrating one of the subjects of the conventional common mode choke coil components.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Common mode choke coil components 2 Signal line 3 Winding trunk part 10 Conductor

Claims (2)

In a common mode choke coil component having a configuration in which a plurality of signal lines forming a pair for common mode choke coil configuration are wound around a winding body portion,
Each signal line is a stranded wire formed by twisting a plurality of conductive wires,
2. The common mode choke coil component, wherein the pair of signal lines are wound around a winding body in a twisted state. In a common mode choke coil component having a configuration in which a plurality of signal lines forming a pair for common mode choke coil configuration are wound around a winding body portion,
Each signal line is a twisted wire formed by twisting a plurality of conductive wires, and the signal wires forming a pair are wound side by side around a winding drum portion. parts.

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