JP2008301384A - Filter and noise restriction system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter and a noise restriction system capable of restricting the generation of common mode noise by correcting unbalancing of a difference signal at a connection portion between a power supply plug and an outlet. <P>SOLUTION: The filter 1 has a first to nth input terminals 11 to 1n, an input terminal 20, a first and second output terminals 21, 22, and a first to nth common mode chalk coil parts 31 to 3n. The first and nth common mode chalk coil parts 31 to 3n output differential signals S1, S2 changing their balance. A comparison calculation part 51 of a controller 5 compares the balance of fedback reflection difference signals S1', S2' and the previous balance in a recording part 52. An input switching part 53 is controlled such that when the balance is higher than the previous balance, difference signals S1, S2 are output from the next stage common mode chalk coil part while when the balance is lower than the previous one, the same are output from the previous stage common mode chalk coil part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter and a noise suppression system for removing common mode noise generated on a power line used for PLC (Power Line Communication).

2. Description of the Related Art In recent years, PLCs that construct a network such as a LAN in a home or office by using a power line stretched around a house or a building have become widespread. In this communication method, a PLC adapter is interposed between a personal computer (hereinafter simply referred to as “PC”) and a power line outlet, and a power plug of the PLC adapter is connected to an outlet such as a wall so that the power line is used as a medium. It is a method that enables the communication. However, since PLC uses a power line that is not originally designed as a communication path as a communication path, more stringent noise suppression measures are required.
Thus, for example, as in the technique disclosed in Patent Document 1, a communication transformer that removes common mode noise on a power line has been proposed.
This transformer has a pair of windings and an additional winding wound between the pair of windings, and has a configuration in which a middle portion of the additional winding is electrically connected to a constant potential. With this configuration, the common mode noise removal performance is improved while maintaining the balance of the pair of differential signals carried on the electric power.

JP 2005-150198 A

However, the conventional techniques described above have the following problems.
The conventional transformer eliminates common mode noise that has entered from the outside while maintaining the balance of a pair of differential signals on the power without considering the conditions when the power plug and outlet are connected. It is the structure to do.
However, when the power plug and the outlet are connected, the impedance on the positive electrode side and the impedance on the negative electrode side in the connection part are different. The amplitude and phase of the signal change at the connection portion between the power plug and the outlet, and the balance between the pair of differential signals is lost. As a result, there is a problem in that the differential signal is reflected in such a connection portion and extremely large common mode noise is generated.
Moreover, since the difference in impedance at the connection between the power plug and the outlet is different for each outlet, the balance of the differential signal balance is also different for each outlet. It is difficult to correct the imbalance.

  The present invention has been made to solve the above-described problem, and a filter capable of correcting the collapse of the balance of the differential signal at the connection portion between the power plug and the outlet and suppressing the occurrence of common mode noise. An object is to provide a noise suppression system.

In order to solve the above-mentioned problems, the invention of claim 1 is a filter provided on a power line on which a pair of differential signals is placed, and inputs one differential signal of the pair of differential signals. N first to n-th input terminals (n is a natural number of 3 or more), one input terminal for inputting the other differential signal, and a first for outputting one differential signal An output terminal; a second output terminal for outputting the other differential signal; and n number of first to n-th common mode choke coil units each having a different winding ratio of the second coil to the first coil. The input terminals of the n number of first coils in the first to nth common mode choke coil sections are connected to the n number of first to nth input terminals, respectively, and the input terminals of the n number of second coils are connected to each other. Connected to one input terminal, the first to nth common mode choke coil The output end of the n number of first coils, as well as connected to the first output terminal, an output terminal of the n number of the second coil, a configuration that is connected to the second output terminal.
With this configuration, the first and second output terminal sides are connected to the outlet of the power line, and one of the balanced pair of differential signals is connected to the m-th (1 ≦ n) of the first to n-th input terminals. m ≦ n) When the other differential signal is inputted to one input terminal while being inputted to the input terminal, one and the other differential signals are respectively applied to the first and second coils of the m-th common mode choke coil section. After being input, it is output from the first and second output terminals. Then, the output pair of differential signals becomes unbalanced at a degree corresponding to the turn ratio of the second coil to the first coil of the m-th common mode choke coil portion, and a part thereof is reflected by the outlet. Come back. At this time, the unbalanced degree of the differential signal reflected by the outlet may be canceled by the outlet, resulting in a desired balance. Therefore, when the reflected pair of differential signals has a desired balance, the state where one differential signal is input to the mth input terminal is maintained. When the reflected differential signal does not have the desired balance, one differential signal is input to another input terminal different from the m-th input terminal. In the same manner, the input terminal for inputting the differential signal is changed until the reflected pair of differential signals has a desired balance. When the reflected differential signal pair has a desired balance, the differential signal input is fixed to the qth (q ≠ m) input terminal. As a result, a pair of differential signals passing through the outlet maintains a desired balance. Further, the differential signal output from the outlet side changes to an unbalanced state by the outlet and is input to the first and second output terminals. Then, the q-th common mode choke coil unit converts the signal back to a balanced differential signal and outputs it from the q-th input terminal and the one input terminal.

  According to a second aspect of the present invention, in the filter according to the first aspect, n number of first to nth flanges are sequentially specified from the other end of the core having the flange at one end toward the flange at the one end. By arranging at intervals, n number of core portions sandwiched between adjacent flanges are formed, and the first to nth input terminals are provided in the first to nth flanges, respectively, and one input is made. The terminal is provided on the first flange, the first output terminal and the second output terminal are provided on the flange on one end, and one winding is connected to one input terminal and the second output terminal on both ends. In this state, the first winding is wound around the n number of core portions in a state where both ends are connected to the first input terminal and the first output terminal. A first common mode choke coil portion having a winding and one winding as a first coil and a second coil is configured, and similarly, one end of n−1 second to nth windings Are connected to the second to nth input terminals in order, and the second to nth windings are wound around the n-1 to 1 cores in order, and the other end of the n-1 number is The second to n-th common mode choke coil section is configured to be connected to one output terminal and have the second to n-th windings and one winding as the first coil and the second coil.

  According to a third aspect of the present invention, in the filter according to the second aspect, in the state in which one winding is at the innermost side, one winding, the first to nth windings in the radial direction of the core portion. It is set as the structure which wound one winding and the 1st-nth coil | winding around the winding core part so that it may pile up in order.

  According to a fourth aspect of the present invention, in the filter according to the second aspect, the single winding, the first winding is arranged so that the single winding and the first to n-th windings are arranged in the length direction of the core. -It is set as the structure which wound the nth coil | winding around the winding core part.

  According to a fifth aspect of the present invention, in the filter according to the first aspect, a laminated body in which a pair of coils facing each other in the laminating direction is formed inside, and first to nth inputs formed outside the laminated body. A terminal, one input terminal, a first output terminal, and a second output terminal, wherein one end of one of the pair of coils is connected to the first input terminal, and the other end is connected to the first output terminal. N-1 lead wires are drawn out from the middle of the coil in order from one end to the other end and connected to the second to nth input terminals, respectively, and the other coil of the pair of coils is connected. One end is connected to one input terminal, the other end is connected to the second output terminal, and the coil portion between the first input terminal and the first output terminal of one coil is defined as the first coil. And a first common mode chip in which the other coil is a second coil. In the same manner, the coil portions between the second to n input terminals and the first output terminal of one coil are respectively the first coil and the second coil is the second coil. A common mode choke coil was constructed.

A noise suppression system according to a sixth aspect of the invention includes the filter according to any one of the first to fifth aspects and one of the differential signals input to any of the first to nth input terminals of the filter. The other differential signal is input to one input terminal, and the pair of differential signals fed back after being output from the first output terminal and the second output terminal of the filter are input to the first filter terminal. The controller includes a controller that inputs one differential signal to an input terminal corresponding to the balance of the pair of differential signals that have been fed back among the nth input terminals.
With this configuration, the controller inputs one differential signal of the balanced pair of differential signals to the mth (1 ≦ m ≦ n) input terminals of the first to nth input terminals of the filter. The other differential signal is input to one input terminal of the filter. Then, one and the other differential signals are input to the first and second coils of the m-th common mode choke coil portion of the filter, respectively, and a pair of differential signals are output from the first and second output terminals. . Then, the differential signal reflected by the outlet is fed back to the controller, and if the controller determines that the pair of differential signals has a desired balance, one differential signal is returned. Is input to the mth input terminal. When it is determined that the reflected differential signal does not have the desired balance, the controller controls the one differential signal to be input to another input terminal different from the m-th input terminal. In the same manner, the input terminal for inputting the differential signal is changed until the reflected pair of differential signals has a desired balance. When it is determined that the reflected differential signal pair has a desired balance, the differential signal input is fixed to the qth (q ≠ m) input terminal. .

As described above in detail, according to the filter of the present invention, an unbalanced differential signal that balances the differential signal reflected by the outlet is output, and the differential signal passing through the outlet is balanced. Therefore, it is possible to greatly suppress the occurrence of common mode noise generated at the outlet portion.
In addition, according to the noise suppression system of the present invention, it is possible to automatically perform processing until outputting an unbalanced differential signal that balances the differential signal reflected by the outlet. .

  The best mode of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a noise suppression system including a filter according to a first embodiment of the present invention.
As shown in FIG. 1, the noise suppression system includes a filter 1 and a controller 5.

  The filter 1 is a filter provided on a power line on which a pair of differential signals is placed by a PLC adapter or the like, and includes n first to n-th input terminals 11 to 1n, one input terminal 20, It has the 1st output terminal 21, the 2nd output terminal 22, and the 1st-nth common mode choke coil parts 31-3n.

  The first to n-th input terminals 11 to 1n are terminals for inputting one differential signal S1 of a pair of differential signals S1 and S2 described later, and the input terminal 20 is the other differential signal S2. Is a terminal for inputting. The first output terminal 21 is a terminal for outputting the differential signal S1, and the second output terminal 22 is a terminal for outputting the differential signal S2.

The first to n-th common mode choke coil sections 31 to 3n are portions for changing and outputting the balance of the input differential signals S1 and S2, and the turn ratio of the second coil to the first coil. Are different.
Specifically, the turn ratio of the second coil 31b to the first coil 31a of the first common mode choke coil portion 31 was set to “1: 1”. The input end of the first coil 31 a of the first common mode choke coil unit 31 was connected to the first input terminal 11, and the input end of the second coil 31 b was connected to the input terminal 20. Further, the output end of the first coil 31 a was connected to the first output terminal 21, and the output end of the second coil 31 b was connected to the second output terminal 22.
As a result, the first common mode choke coil unit 31 receives the balanced differential signals S1 and S2 input from the first input terminal 11 and the input terminal 20 while maintaining the balanced state. The output can be output from the output terminal 22.
Further, the turn ratio of the second coil 32b to the first coil 32a of the second common mode choke coil portion 32 is set to “1: 2”. The input end of the first coil 32 a of the second common mode choke coil portion 32 was connected to the second input terminal 12, and the input end of the second coil 32 b was connected to the input terminal 20. Further, the output end of the first coil 32 a was connected to the first output terminal 21, and the output end of the second coil 32 b was connected to the second output terminal 22.
As a result, the second common mode choke coil unit 32 causes the balanced differential signals S1 and S2 input from the first input terminal 12 and the input terminal 20 to be in a slightly unbalanced state. An output can be made from the second output terminal 22.
Similarly, the turn ratio of the second coil 3nb to the first coil 3na of the nth common mode choke coil portion 3n was set to “1: n”. The input terminal of the first coil 3na of the nth common mode choke coil unit 3n was connected to the nth input terminal 1n, and the input terminal of the second coil 3nb was connected to the input terminal 20. Further, the output end of the first coil 3na was connected to the first output terminal 21, and the output end of the second coil 3nb was connected to the second output terminal 22.
As a result, the n-th common mode choke coil unit 3n sets the balanced differential signals S1 and S2 input from the first input terminal 1n and the input terminal 20 to the largest unbalanced state, so that the first output terminal 21 and the first output terminal 21 Two output terminals 22 can be output.
That is, the degree of unbalance of the output differential signals S1 and S2 is the lowest in the first common mode choke coil unit 31, and as it goes from the second common mode choke coil unit 32 to the nth common mode choke coil unit 3n. The turn ratio of the first to nth common mode choke coil portions 31 to 3n was set so as to be higher.

The filter 1 having the electrical configuration as described above is a wire wound filter.
FIG. 2 is a side view showing the core of the filter 1 of the first embodiment, and FIG. 3 is a schematic cross-sectional view showing the winding of the filter 1 cut away.
As shown in FIG. 2, the core 2 is a bobbin-shaped member formed of a magnetic material, and has a left end flange 2 </ b> A and n number of first to nth flanges 2 </ b> A <b> 1 to 2An.
Specifically, the first to n-th flange portions 2A1 to 2An are arranged at predetermined intervals in order from the right end of the core 2 toward the left-end flange portion 2A, and n number of core portions 2B1 to 2Bn are arranged. The first to nth flange portions 2A1 to 2An and the flange portion 2A are formed.
And the 1st-nth input terminals 11-1n were formed in the 1st-nth collar part 2A1-2An, respectively, and one input terminal 20 was formed in 1st collar part 2A1. Moreover, the 1st output terminal 21 and the 2nd output terminal 22 were each formed in the collar part 2A of the left end.

As shown in FIG. 3, one winding 3 </ b> A and n first to n-th windings 3 </ b> A <b> 1 to 3 </ b> An are wound around the core 2 having the above structure. In FIG. 3, the numbers “0”, “1”, “2” to “n” are inserted in the cross section of each winding in order to easily distinguish each winding. Here, numerals “0”, “1”, “2” to “n” indicate the winding 3A, the first winding 3A1, the second winding 3A2 to the nth winding 3An in this order.
Specifically, in a state where one winding 3A is arranged on the innermost side, the winding 3A and the first to n-th windings 3A1 to 3An are connected to the winding 3A and the first to n-th windings 3A1 to 3An. It wound around core part 2B1-2Bn so that it might pile up in the radial direction of core part 2B1-2Bn in this order.
Specifically, one winding 3 </ b> A is wound around n cores 2 </ b> B <b> 1 to 2 </ b> Bn, and both ends of the winding 3 </ b> A are connected to one input terminal 20 and the second output terminal 22.
Thereafter, the first winding 3 </ b> A <b> 1 was wound around n core parts 2 </ b> B <b> 1 to 2 </ b> Bn, and both ends thereof were connected to the first input terminal 11 and the first output terminal 21. As a result, the first common mode choke coil portion 31 having the first winding 3A1 as the first coil 31a and the single winding 3A as the second coil 31b was configured.
Next, the second winding 3 </ b> A <b> 2 was wound around n−1 cores 2 </ b> B <b> 2 to 2 </ b> Bn, and both ends thereof were connected to the first input terminal 12 and the first output terminal 21. As a result, the second common mode choke coil portion 32 having the second winding 3A2 as the first coil 32a and the single winding 3A as the second coil 32b was configured.
In the same manner, the third to n-th windings 3A3 to 3An are sequentially wound around the n-2 number to one number of core portions 2B2 to 2Bn, and the (n-2) third to n-th windings 3A3 are wound. One end of ˜3An was connected to the third to nth input terminals 13 to 1n in order, and the other end of n−2 number was connected to the first output terminal 21. As a result, the third to n-th common mode choke coil portions 33 to 3n in which the third to n-th windings 3A3 to 3An are the first coils 33a to 3na and the winding 3A is the second coils 33b to 3nb are configured. .

On the other hand, the controller 5 shown in FIG. 1 is an IC (Integrated Circuit) for controlling the input of the differential signals S1 and S2 to the filter 1, and includes a comparison operation unit 51, a recording unit 52, and an input switching unit 53. Prepare.
The comparison calculation unit 51 is a part that calculates the balance of the reflected differential signals S1 ′ and S2 ′ by comparing and calculating the phases and amplitudes of the reflected differential signals S1 ′ and S2 ′ described later. Specifically, the balance Dx of the reflected differential signals S1 ′ and S2 ′ input from the feedback input terminals 54 and 55 is obtained, and this balance Dx and the previous balance Dx− recorded in the recording unit 52 are obtained. Compare with 1. When the balance Dx is higher than the previous balance Dx−1, the balance Dx is recorded in the recording unit 52 and the switching signal C1 is output to the input switching unit 53. When the balance Dx is lower than the previous balance Dx−1, the balance Dx is recorded in the recording unit 52 and the holding signal C2 is output to the input switching unit 53.

  The input switching unit 53 has a movable contact 53a and n fixed contacts 53a1 to 53an connected to the output terminals 56a1 to 56an, respectively. When the switching signal C1 is input from the comparison operation unit 51, the movable contact 53a is turned on. Switch from the current connection state with the fixed contact to the connection with the next fixed contact. Further, when the holding signal C2 is input from the comparison calculation unit 51, the movable contact 53a is switched from the current fixed contact to the connection with the previous fixed contact, and the connection state with the previous fixed contact is held.

Next, the operation and effect exhibited by the filter 1 of this embodiment will be described.
FIG. 4 is a schematic diagram showing an example of use of the noise suppression system including the filter 1 of the first embodiment, and FIG. 5 is a block diagram for explaining the operation and effect of the noise suppression system.
For example, as shown in FIG. 4, when a network is constructed using a power line 200 wired in the house between a personal computer 111 on the first floor 101 and a personal computer 121 on the second floor of the house 100, This can be achieved by connecting the PLC adapters 112 and 122 and connecting the power plugs 211 and 221 drawn from the PLC adapters 112 and 122 to the outlets 212 and 222, respectively.
The noise suppression system including the filter 1 according to the present embodiment is provided on the power lines 215 and 216 between the power plugs 211 and 221 and the PLC adapters 112 and 122, thereby generating a common mode on the power lines 215 and 216. Generation of noise can be suppressed.

  Specifically, as shown in FIG. 5, the output terminals 56a1 to 56an of the controller 5 and the first to nth input terminals 11 to 1n of the filter 1 are connected, and the output terminal 57b and the input terminal 20 are connected. In this state, the input terminals 56 and 57a of the controller 5 are connected to the power lines 215a (216a) and 215b (216b) constituting the power line 215 (216) from the PLC adapter 112 (122), respectively. The first output terminal 21 and the second output terminal 22 of the filter 1 are connected to the power lines 215a (216a) and 215b (216b) on the power plug 211 (221) side, and these power lines 215a (216a) and 215b are connected. The feedback lines 217a and 217b branched from (216b) are connected to the feedback input terminals 54 and 55 of the controller 5.

In this state, when balanced differential signals S 1 and S 2 are output from the PLC adapter 112 (122) with electric power, the differential signal S 1 is sent to the first common mode of the filter 1 via the input switching unit 53 of the controller 5. The differential signal S2 is input to the first coil 31a of the choke coil unit 31 and input to the second coil 31b of the first common mode choke coil unit 31 of the filter 1 via the input / output terminals 57a and 57b of the controller 5. To do.
Since the turns ratio of the first common mode choke coil unit 31 is “1: 1”, balanced differential signals S1 and S2 are transmitted from the first common mode choke coil unit 31 to the power plug 211 (221) side. Are output to the power lines 215a (216a) and 215b (216b).
The differential signals S1 and S2 try to enter the power line 200 through a connection portion between the power plug 211 (221) and the outlet 212 (222).
However, since the impedance of the connection portion between the power plug 211 (221) and the outlet 212 (222) and the impedance of the power line 215 (216) are different, the balance between the differential signals S1 and S2 is lost and unbalanced. The differential signals S1 ′ and S2 ′ are input to the power line 200, and a part thereof is reflected at the connection portion between the power plug 211 (221) and the outlet 212 (222), and the feedback lines 217a and 217b and the feedback input are reflected. The result is fed back into the comparison calculation unit 51 of the controller 5 through the terminals 54 and 55.
Then, the comparison calculation unit 51 obtains the balance D1 of the reflected differential signals S1 ′ and S2 ′ and outputs the switching signal C1 (see FIG. 1) to the input switching unit 53. Thereby, in the input switching part 53, the movable contact 53a is switched from the current connection state of the fixed contact 53a1 to the connection with the next fixed contact 53a2.

As a result, the differential signal S1 from the PLC adapter 112 (122) is input to the first coil 32a of the second common mode choke coil unit 32 of the filter 1 via the input switching unit 53 of the controller 5. The differential signals S1 and S2 are input to the second common mode choke coil unit 32.
Since the turn ratio of the second common mode choke coil section 32 is “1: 2”, the slightly unbalanced differential signals S1 and S2 are supplied from the second common mode choke coil section 32 to the power plug. The reflected differential signals S1 ′ and S2 ′ output to the power lines 215a (216a) and 215b (216b) on the 211 (221) side and reflected at the connection portion between the power plug 211 (221) and the outlet 212 (222) are output. The feedback is returned to the comparison calculation unit 51 of the controller 5.
As a result, the comparison calculation unit 51 obtains the balance D2 of the reflected differential signals S1 ′ and S2 ′, and compares this balance D2 with the previous balance D1 recorded in the recording unit 52. .
By the way, the unbalance of the differential signals S1 and S2 output from the second common mode choke coil section 32 is reduced by the unbalance due to the connection portion between the power plug 211 (221) and the outlet 212 (222). The balance of the reflected differential signals S1 'and S2' is higher than the previous balance D1.
As a result, the balance D2 is recorded in the recording unit 52, the switching signal C1 is output to the input switching unit 53, and the movable contact 53a of the input switching unit 53 is switched to the connection with the first fixed contact 53a3. .
As a result, the differential signals S1 and S2 are input to the third common mode choke coil portion 33 of the filter 1, and the turn ratio of the third common mode choke coil portion 33 is “1: 3”. The differential signals S1 and S2 having a greater degree of imbalance than in the case of the two common mode choke coil unit 32 are transmitted from the third common mode choke coil unit 33 to the power lines 215a (216a) and 215b (on the power plug 211 (221) side). 216b). Then, the reflected differential signals S 1 ′ and S 2 ′ reflected at the connection portion between the power plug 211 (221) and the outlet 212 (222) are fed back into the comparison calculation unit 51 of the controller 5.
Thereafter, as long as the controller 5 receives the reflected differential signals S1 ′ and S2 ′ whose balance Dx is higher than the previous balance Dx−1, the switching operation of the input switching unit 53 is continued.

Thereafter, the differential signals S1 and S2 are output from the q-th common mode choke coil section 3q (1 ≦ q ≦ n), and the unbalance degree of the differential signals S1 and S2 is determined by the power plug 211 (221) and the outlet. When canceled by the unbalance degree due to the connection part 212 (222), the balance degree Dq of the reflected differential signals S1 'and S2' becomes the highest. When the balance Dq is obtained by the comparison calculation unit 51, it is recorded in the recording unit 52 and the switching signal C1 is output to the input switching unit 53, and the movable contact 53a of the input switching unit 53 is moved as in the previous case. The connection is switched to the first fixed contact 53aq + 1.
As a result, the differential signals S1 and S2 are output from the (q + 1) th common mode choke coil unit 3q + 1, and the reflected differential signals S1 ′ and S2 ′ are fed back to the controller 5. In this case, the unbalance of the differential signals S1 and S2 from the q + 1-th common mode choke coil unit 3q + 1 exceeds the unbalance due to the connection portion between the power plug 211 (221) and the outlet 212 (222). Therefore, the balance Dq + 1 of the reflected differential signals S1 'and S2' is lower than the previous balance Dq.
As a result, the holding signal C2 (see FIG. 1) is output to the input switching unit 53, the movable contact 53a is switched from the current fixed contact 36aq + 1 to the previous fixed contact 53aq, and the state is maintained. The
As a result, when the differential signals S1 ′ and S2 ′ having the highest balance are input to the power line 200 inside the outlet 212 of the first floor 101 shown in FIG. 4, for example, the differential signals S1 ′ and S2 ′ are 2 The power is output from the outlet 222 of the floor 102 to the power line 216.
At this time, the balance of the differential signals S1 ′ and S2 ′ is lost, and the differential signals S1 and S2 having the same degree of unbalance as the unbalance by the q-th common mode choke coil unit 3q of the filter 1 are Input from the power line 216 to the first and second output terminals 21 and 22 of the filter 1 on the second floor. Then, it is inversely converted by the q-th common mode choke coil unit 3q, and is output to the PLC adapter 122 through the controller 5 as balanced differential signals S1 and S2.

  As described above, according to the noise suppression system including the filter 1 of this embodiment, the unbalance degree of the differential signals S1 and S2 output from the filter 1 is determined based on the power plug 211 (221) and the outlet 212 (222). Since the unbalance due to the connection portion is canceled and differential signals S1 'and S2' having high balance are output to the power line 200, the common at the connection portion between the power plug 211 (221) and the outlet 212 (222) Generation of mode noise can be prevented.

FIG. 6 is a schematic cross-sectional view showing the winding of the filter according to the second embodiment of the present invention in a cutaway manner.
The winding method of this embodiment is different from that of the first embodiment.
Specifically, as shown in FIG. 6, one winding 3 </ b> A and first to n-th windings 3 </ b> A <b> 1 to 3 </ b> An are arranged in the length direction of the core 2 (left and right direction in FIG. 6), One winding 3A and the first to n-th windings 3A1 to 3An were wound around the core parts 2B1 to 2Bn without a gap.
Specifically, one winding 3 </ b> A is wound around n cores 2 </ b> B <b> 1 to 2 </ b> Bn, and both ends of the winding 3 </ b> A are connected to the input terminal 20 and the second output terminal 22. In parallel with this, the first winding 3 </ b> A <b> 1 was wound around n core parts 2 </ b> B <b> 1 to 2 </ b> Bn, and both ends thereof were connected to the first input terminal 11 and the first output terminal 21. As a result, the first common mode choke coil portion 31 having the first winding 3A1 as the first coil 31a and the single winding 3A as the second coil 31b was configured.
In the winding core portions 2B2 to 2Bn, the second winding 3A2 is wound in parallel with the winding 3A and the first winding 3A1, and both ends thereof are connected to the first input terminal 12 and the first output terminal 21. Connected. As a result, the second common mode choke coil portion 32 having the second winding 3A2 as the first coil 32a and the single winding 3A as the second coil 32b was configured.
In the same manner, the third to n-th windings 3A3 to 3An are sequentially wound in parallel around the n-2 number to one number of the core portions 2B2 to 2Bn, and the n-2 third to third numbers are wound. One end of each of the n windings 3 </ b> A <b> 3 to 3 </ b> An is connected to the third to nth input terminals 13 to 1 n in order, and the other end of n−2 number is connected to the first output terminal 21. As a result, the third to n-th common mode choke coil portions 33 to 3n in which the third to n-th windings 3A3 to 3An are the first coils 33a to 3na and the winding 3A is the second coils 33b to 3nb are configured. .
Since other configurations, operations, and effects are the same as those of the first embodiment, description thereof is omitted.

FIG. 7 is a circuit diagram of a filter according to the third embodiment of the present invention.
As shown in FIG. 7, the filter of this embodiment is composed of n number of common mode chokes corresponding to the first to nth common mode choke coil sections 31 to 3n shown in FIG. The point which formed the coil part differs from the said 1st and 2nd Example.
Specifically, the lead wire 6 a at one end of the coil 6 was connected to the first input terminal 11, and the lead wire 6 d at the other end was connected to the first output terminal 21. Then, the lead wires 6b and 6c were drawn from the middle of the coil 6 at a predetermined winding number interval and connected to the second and third input terminals 12 and 13, respectively.
On the other hand, in the coil 7, the lead wire 7 a at one end is connected to the input terminal 20, and the lead wire 7 b at the other end is connected to the second output terminal 22.
As a result, the first common mode choke coil portion 31 in which the coil portion between the first input terminal 11 and the first output terminal 21 of the coil 6 is the first coil 31a and the coil 7 is the second coil is configured.
And the coil part between the 2nd input terminal 12 and the 1st output terminal 21 of the coil 6 was made into the 1st coil 32a, and the 2nd common mode choke coil part 32 which made the coil 7 the 2nd coil was comprised.
Further, the third common mode choke coil portion 32 is configured in which the coil portion between the third input terminal 13 and the first output terminal 21 of the coil 6 is the first coil 33a and the coil 7 is the second coil.

In this embodiment, a multilayer chip filter is exemplified as a filter having such an electric circuit structure.
FIG. 8 is a plan view of the multilayer chip filter, and FIG. 9 is an exploded perspective view for illustrating a stacked state of the filter.
As shown in FIG. 8, the filter includes a laminate 8, first to third input terminals 11 to 13, an input terminal 20, first and second output terminals 21, formed outside the laminate 8. And 22.
As shown in FIG. 9, the laminate 8 includes insulating layers 81 to 85, and includes a pair of spiral coils 6 and 7 that face each other in the lamination direction.

  Specifically, the lead lines 7a and 7b are patterned on the lowermost insulating layer 81, the insulating layer 82 is laminated on the lead lines 7a and 7b, and the coil 7 is patterned on the insulating layer 82. did. The outer end of the coil 7 was connected to the lead wire 7a through the through hole 82a, and the inner end was connected to the lead wire 7b through the through hole 82b.

An insulating layer 83 is laminated on the coil 7, and the coil 6 is patterned on the insulating layer 83. Then, the insulating layer 84 was laminated on the coil 6, and the lead wires 6 a to 6 d were patterned on the insulating layer 84. The outer end of the coil 6 was connected to the lead wire 6a through the through hole 84a, and the inner end was connected to the lead wire 6d through the through hole 84d. Furthermore, the middle part of the coil 6 was connected to the lead wires 6b and 6c through the through holes 84b and 84c.
Thereafter, the insulating layer 85 was stacked on the lead lines 6a to 6d to form the stacked body 8.

  Finally, the input terminal 20 and the second output terminal 22 were formed outside the stacked body 8 and connected to the lead wires 7 a and 7 b exposed on the side surfaces of the stacked body 8. Further, the first to third input terminals 11 to 13 and the first output terminal 21 were formed outside the stacked body 8 and connected to the lead lines 6 a to 6 d exposed on the side surfaces of the stacked body 8, respectively.

Thus, the coil portion between the first input terminal 11 and the first output terminal 21 of the coil 6 and the coil 7 constitute a first common mode choke coil portion 31, and the second input terminal 12 and the first output terminal The second common mode choke coil portion 32 is constituted by the coil portion between the coil 21 and the coil 7, and the third common mode is constituted by the coil portion between the third input terminal 13 and the first output terminal 21 and the coil 7. A choke coil portion 32 was configured.
Since other configurations, operations, and effects are the same as those of the first and second embodiments, description thereof is omitted.

In addition, this invention is not limited to the said Example, A various deformation | transformation and change are possible within the range of the summary of invention.
For example, in the above embodiment, the core 2 is formed of a magnetic material, and the stacked body 8 is formed of an insulator. However, the present invention is not limited to this, and the core 2 and the stacked body 8 are formed of a magnetic material and a dielectric material. Of course, it can be formed of any other material equivalent to this.

It is a block diagram which shows the noise suppression system provided with the filter which concerns on 1st Example of this invention. It is a side view which shows the core of the filter of 1st Example. It is a schematic sectional drawing which fractures | ruptures and shows the coil | winding of a filter. It is the schematic which shows the usage example of the noise suppression system provided with the filter of 1st Example. It is a block diagram for demonstrating the effect | action and effect which a noise suppression system shows. It is a schematic sectional drawing which fractures | ruptures and shows the coil | winding of the filter which concerns on 2nd Example of this invention. It is a circuit diagram of the filter which concerns on 3rd Example of this invention. It is a top view of a multilayer chip filter. It is a disassembled perspective view for showing the lamination state of a filter.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Filter, 2 ... Core, 2A, 2A1-2An ... collar part, 2B1-2Bn ... Core part, 3A, 3A1-3An ... Winding, 31-3n ... 1st-nth common mode choke coil part, 5 ... Controllers, 6, 7 ... Coils, 6a to 6d, 7a, 7b ... Lead wires, 8 ... Laminated bodies, 11-1n ... First to nth input terminals, 20, 56, 57a ... Input terminals, 21 ... First Output terminal 22 ... second output terminal 31a-3na ... first coil 31b-3nb ... second coil 51 ... comparison operation part 52 ... recording part 53 ... input switching part 53a ... movable contact 53a1 53an ... fixed contact, 54, 55 ... feedback input terminal, 56a1-56an, 57b ... output terminal, 81-85 ... insulating layer, 100 ... home, 112, 122 ... PLC adapter, 200, 215, 216 ... power line, 211, 221 ... power plug, 212, 222 ... outlet, 217a, 217b ... feedback line, C1 ... switching signal, C2 ... holding signal, S1, S2, S1 ', S2' ... differential signal.

Claims (6)

A filter provided on a power line carrying a pair of differential signals,
N number of first to nth input terminals (n is a natural number of 3 or more) for inputting one differential signal of a pair of differential signals, and one input for inputting the other differential signal A first output terminal for outputting the one differential signal, a second output terminal for outputting the other differential signal, and a turn ratio of the second coil to the first coil, respectively. A different n number of first to nth common mode choke coil sections,
The input ends of the n number of first coils in the first to nth common mode choke coil sections are connected to the n number of first to nth input terminals, respectively, and the input ends of the n number of second coils are , Connect to the one input terminal,
The output terminals of the n number of first coils of the first to nth common mode choke coil sections are connected to the first output terminal, and the output terminals of the n number of second coils are connected to the second output terminal. Connected,
A filter characterized by that. The filter of claim 1,
By arranging n number of first to nth flanges in order from the other end of the core having the flange on one end toward the flange on the one end, the core is sandwiched between adjacent flanges. Forming n number of cores,
The first to n-th input terminals are provided in the first to n-th collar parts, respectively, the one input terminal is provided in the first collar part, and the first output terminal and the second output terminal are provided. Provided on the heel of the one end,
One winding is wound around the n number of cores with both ends connected to the one input terminal and the second output terminal.
The first winding is wound around the n number of core portions with both ends connected to the first input terminal and the first output terminal, and the first winding and the one winding are connected to each other. Configuring the first common mode choke coil section as the first coil and the second coil;
Similarly, one end of n−1 second to n-th windings is connected to the second to n-th input terminals in order, and the second to n-th windings are sequentially connected to n−1 numbers. It winds around one number of winding cores, connects the other end of n-1 number to the first output terminal, and connects the second to nth windings and the one winding to the first coil. And the second to n-th common mode choke coil portion as the second coil.
A filter characterized by that. The filter according to claim 2, wherein
In the state where the one winding is in the innermost side, the one winding is stacked in the radial direction of the winding core in the order of the one winding and the first to nth windings. The first to nth windings are wound around the core part.
A filter characterized by that. The filter according to claim 2, wherein
The one winding and the first to nth windings were wound around the core portion so that the one winding and the first to nth windings were arranged in the length direction of the core.
A filter characterized by that. The filter of claim 1,
A laminated body in which a pair of coils facing each other in the laminating direction is formed, and the first to nth input terminals, the one input terminal, the first output terminal, and the first output terminal formed outside the laminated body. 2 output terminals,
One end of one coil of the pair of coils is connected to the first input terminal, the other end is connected to the first output terminal, and n− in order from the one end to the other end. One lead wire is pulled out from the middle of the coil and connected to the second to nth input terminals,
One end of the other coil of the pair of coils is connected to the one input terminal, and the other end is connected to the second output terminal,
The coil portion between the first input terminal and the first output terminal of the one coil is the first coil and the other common coil is the second common coil.
Similarly, the second to n common modes in which the coil portion between the second to n input terminals and the first output terminal of the one coil is a first coil and the other coil is a second coil. Configured the choke coil section,
A filter characterized by that. A filter according to any one of claims 1 to 5;
The one differential signal is input to any one of the first to nth input terminals of the filter, and the other differential signal is input to the one input terminal. The pair of differential signals that have been fed back after being output from the two output terminals are input, and among the first to nth input terminals of the filter, the pair of differential signals that have been fed back are input. A noise suppression system comprising: a controller that inputs the one differential signal to an input terminal corresponding to a degree of balance.

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