JP4599818B2 - Leakage magnetic flux reduction device - Google Patents

Description

  The present invention relates to a leakage magnetic flux reduction device that is used in various electric devices used for business use and general household use, and reduces leakage magnetic flux emitted from the device.

  Conventionally, as shown in FIG. 10, a general device that operates by receiving an AC power source is a 100 V 50 Hz or 60 Hz AC power source 1, a heater or a light bulb that operates by applying an AC voltage of 100 V, and various other types of loads. 2, 4 and switches 2 and 3 are connected in series, and switches 4 and 5 for turning on and off the operation are provided.

  Conductors 11, 12, 13, 14, 15, 16, 17, and 18 using copper are connected between the AC power source 1 and the loads 2 and 3 and the switches 4 and 5, respectively.

  In the above configuration, as shown in FIG. 11 (a), when the switch 4 is turned on, 100V of the output voltage of the AC power supply 1 is applied to the load 2, and the load 2 operates. Thus, when the switch 5 is turned on, 100 V of the output voltage of the AC power supply 1 is applied to the load 3, and the load 3 operates.

  Of course, when the switches 4 and 5 are simultaneously turned on, 100 V that is the voltage of the AC power supply 1 is applied to both of the loads 2 and 3, and both of the loads 2 and 3 operate. .

For the purpose of preventing electromagnetic waves emitted from the heating wire, an insulating layer is provided outside the heating wire, a shielding layer is provided outside the heating wire, and the direction of the current flowing through the shielding layer is opposite to the direction of the current flowing through the heating wire. The thing of the structure which reduces electromagnetic waves is shown by connecting so that it may become (for example, refer patent document 1).
JP 2000-182759 A (Page 17, FIGS. 8, 9)

  However, in the device having the conventional configuration, an area is generated in the path through which the current flows as shown by the hatched lines in FIGS. 11A and 11B because the current flows from the AC power source 1 to the loads 2 and 3. Since the magnetic flux is generated and the current is an alternating current, a leakage magnetic flux including a component of 50 Hz or 60 Hz that is the frequency of the AC power supply 1 is generated around the device.

  In the conventional configuration, when a predetermined value is required as the magnitude of the current flowing through the loads 2 and 3, in order to reduce the leakage magnetic flux, the area of the portion indicated by the diagonal lines in FIGS. Will be made as small as possible.

  If a central copper wire having a low resistance is used instead of the heating wire as shown in Patent Document 1, a round-trip current flows in the opposite direction to the central copper wire and the shielding layer. The area can be almost completely zero, and the effect of reducing the leakage magnetic flux can be expected.

  However, when there are restrictions on the placement of components such as the loads 2 and 3 and the switches 4 and 5 in FIG. In many cases, the area of the portion indicated by the slope cannot be kept small, and there is a limit to the reduction of the area.

Also, in actual electrical equipment, not only simply turning on and off one or two loads, but also a very large number of loads and switches, which are composed of complicated wiring, such as being branched or looped everywhere In many cases, the current flowing through the shielding layer is the same as the current flowing through the central copper wire of the portion even in the coaxial configuration as shown in Patent Document 1, for example. In some cases, the current was not diverted, and the effect was not sufficiently improved.

  In such a case, the magnitude of the leakage magnetic flux generated outside the device tends to increase (the leakage magnetic flux density (unit: uses Gauss, Tesla, etc.). There has been a problem that a malfunction such as malfunction of the device may occur.

  The present invention solves the above problem, and realizes a leakage magnetic flux reduction device that suppresses the magnitude of leakage magnetic flux generated outside the device even when there is an area in the path of current supplied from an AC power source to a load. The purpose is to eliminate problems such as malfunctions of surrounding equipment.

In order to solve the above problems, a leakage magnetic flux reduction device of the present invention electrically connects a plurality of loads that receive power supply from an AC power source, a switch connected in series to the load, and the AC power source and the load. A first conductor having a branch to be connected and a second conductor magnetically coupled to the first conductor, the second conductor forming a closed circuit, and a current flowing through the first conductor and flux by the second current flowing circulating closed circuit conductors in the opposite direction, by a configuration in which the to cancel the magnetic flux generated by current flowing through the first conductor, the first flowed by magnetic coupling 2 The current of the first conductor cancels out the magnetic flux generated by the current flowing through the first conductor, suppresses the magnitude of the leakage magnetic flux generated outside the device, and eliminates malfunctions such as malfunctions of surrounding devices.

  As described above, the leakage magnetic flux reduction device of the present invention has a load connected to an AC power source by the first conductor 31, a second conductor magnetically coupled to the first conductor, and the like. The conductor is formed in a closed circuit shape, and the magnetic flux caused by the current flowing through the first conductor is canceled by the current flowing through the closed circuit of the second conductor, thereby reducing the leakage magnetic flux.

The invention according to claim 1 includes a plurality of loads that receive power supply from an AC power source, a switch connected in series to the load, and a branch that electrically connects the AC power source and the load . A second conductor magnetically coupled to the first conductor, the second conductor forming a closed circuit, and the second conductor in a direction opposite to a current flowing through the first conductor . flux due to the current flowing circulating a closed circuit conductors, by a structure in which to cancel the magnetic flux generated by current flowing through the first conductor, the current of the second conductor, the current flowing through the first conductor The action of canceling out the magnetic flux caused by the above is performed, and the magnitude of the leakage magnetic flux generated outside the device is kept low.

  The invention according to claim 2 is the leakage flux reduction device according to claim 1 in particular, and has a toroidal magnetic core, and the first conductor and the second conductor have the toroidal magnetic core. By adopting the penetrating configuration, the magnetic coupling between the first conductor and the second conductor becomes dense, and the effect of reducing the leakage magnetic flux due to the current flowing through the second conductor becomes large.

  In addition, the invention according to claim 3 is a comparative example in which the leakage magnetic flux reduction device according to claim 1 is provided with a magnetic layer that wraps the first conductor and the second conductor. With a simple configuration, the magnetic coupling between the first conductor and the second conductor can be increased, and the effect of reducing the leakage magnetic flux due to the current flowing through the second conductor is great.

  According to a fourth aspect of the present invention, the magnetic layer of the leakage magnetic flux reducing device according to the third aspect is made of a permalloy, so that the magnetic layer has a high magnetic permeability. Even if the layer is made thin, the magnetomotive force required for the excitation is small, the current flowing through the second conductor is large, and the effect of reducing the leakage magnetic flux is large.

  The invention according to claim 5 is the leakage flux reduction device according to claim 1 in particular, and includes a current transformer having magnetic coupling, and the first conductor and the second conductor are each of the current transformer. By connecting the primary winding and the secondary winding, the magnetic coupling between the primary winding and the secondary winding can be sufficiently ensured, the current flowing through the second conductor is large, and the leakage flux The effect of reducing is large.

  The invention described in claim 6 is configured such that the first conductor and the second conductor of the leakage magnetic flux reduction device described in any one of claims 1 to 5 depend on each other. Thus, the first conductor and the second conductor are strongly magnetically coupled with a relatively simple configuration, and the effect of reducing leakage magnetic flux can be sufficiently increased.

  The invention according to claim 7 is a configuration in which the first conductor and the second conductor of the leakage magnetic flux reduction device according to any one of claims 1 to 5 are provided coaxially. Thus, the first conductor and the second conductor can be satisfactorily magnetically coupled with a relatively simple configuration, and the effect of reducing leakage magnetic flux can be sufficiently increased.

  Next, specific examples of the present invention will be described.

Example 1
FIG. 1 shows a circuit diagram of a leakage flux reducing apparatus in a first embodiment of the present invention.

  In FIG. 1, a 100 V 50 Hz or 60 Hz AC power source 1, a heater or a light bulb that operates by applying an AC voltage of 100 V, and other various types of loads 2, 3, loads 2, 3 are connected in series to operate. The switches 4 and 5 for turning on and off are provided, and these components are the same as those of the conventional technology.

  In this embodiment, the first conductors 31, 32, 33, 34, 35, 36, 37, 38 using copper are connected between the AC power source 1 and the loads 2, 3 and the switches 4, 5, respectively. is doing.

  The second conductors 51, 52, 53, 54, 55, 56, 57, 58 are all provided coaxially outside the first conductors 31, 32, 33, 34, 35, 36, 37, 38. In the portion of the AC power source 1, the second conductors 51 and 55 are connected by a line 71, in the upper portion, the second conductors 51 and 52 are connected by a line 72, and in the portion of the load 2 by a line 73. The switch 4 is connected by a line 74, and the second conductors 54 and 55 are connected by a line 75 in the lower part to form a closed circuit.

  Similarly, since the second conductors are connected by the lines 75, 76, 77, 78, 79, 80, the second conductor 51 is also associated with the path through which current is supplied from the AC power supply 1 to the load 3. , 56, 57, 58 and 55 are connected in a closed circuit shape.

  In the present embodiment, iron toroidal magnetic cores 61, 62, 63, 64, 65, 66, 67, 68 are provided, and the second conductors 51, 52, 53, 54, 55, 56, 57, 58 are provided. Each has a configuration through each.

  FIG. 2 shows a cross section of the coaxial wiring used in each part of the present embodiment.

  The first conductor 31 is arranged in the center, the polyethylene insulating layer 84 is provided on the outer side, the tubular second conductor 51 is provided on the outer side, and the outer jacket portion made of vinyl chloride is further provided on the outer side. An insulating layer 85 is wound.

  With the above configuration, the operation of this embodiment will be described.

  When the switch 4 is turned on, 100 V of the output voltage of the AC power source 1 is applied to the load 2 and the load 2 operates. If the upper terminal of the AC power source 1 is positive at this time, The first object 31, 32, 33, 34, 35 flows in this order, and the current flows through the path returning to the lower terminal of the AC power supply 1, and the clockwise current flows toward FIG. 1. Therefore, a magnetomotive force in the opposite direction is generated.

  However, in this embodiment, the second conductors 51, 52, 53, 54, and 55 have a current in the reverse direction, that is, counterclockwise due to the magnetic coupling with the first conductors 31, 32, 33, 34, and 35. Especially in the case of the present embodiment, the iron toroidal magnetic cores 61, 62, 63, 64, 65 have a large magnetic coupling between the first conductor and the second conductor in each part. Therefore, the magnitude of the current that circulates through the second conductor in the closed circuit shape is close to the magnitude of the current that flows through the load 2, and is due to the counterclockwise current that flows through the second conductor. Since the magnetomotive force is directed in this direction toward FIG. 1, the magnetomotive force is just in the direction to cancel the magnetic flux caused by the current flowing in the first conductor.

  Therefore, the generated magnetic flux is canceled out, and the leakage magnetic flux that leaks to the outside of the device can also be reduced.

  The load 3 also operates by turning on the switch 5, but the current path is also in the second conductor of each part as in the case of the load 2. Since the current flows in a direction opposite to the current flowing in the first conductor of the portion, the operation of canceling the magnetic flux is also performed.

  At this time, the toroidal magnetic cores 61, 66, 67, 68, 65 act so that the magnetic coupling between the first conductor and the second conductor in those portions can be satisfactorily taken, and the above-mentioned A current close to the current flowing through the load 3 flows in the circulation path, and the magnetic flux is canceled out.

  When the switches 4 and 5 are turned on at the same time, the loads 2 and 3 are operated simultaneously. In this case as well, the first conductors 32, 33, and 34 are supplied to the load 2. The current flows, the first conductors 36, 37, and 38 are supplied with current for supplying to the load 3, and the first conductors 31 and 35 are supplied with current for the total of the loads 2 and 3. However, in each part, a current close to the current flowing in the first conductor for each part due to magnetic coupling also flows in the second conductor, and the direction is reversed, so that the magnetic flux generated in any part. The effect of canceling out occurs.

  In the present embodiment, a total of eight toroidal magnetic cores 61, 62, 63, 64, 65, 66, 67, 68 are used. However, the number of toroidal magnetic cores is a closed circuit. If at least one part is present, the effect is generated, and the number may be increased as necessary.

  In FIG. 1, there is a branch in the wiring in order to obtain a circuit configuration in which the two loads 2 and 3 can be turned on and off separately by the switches 4 and 5, but in this embodiment, each wiring portion has a toroidal shape. Since the magnetic core is provided, a magnetic coupling action occurs in each part of the wiring, and the current flowing through the second conductor is substantially the same as the current flowing through the first conductor in that portion. Since the direction can be reversed, the current distribution of the second conductor is close to the current distribution of the first conductor even if there is a branch.

  Even if there is a loop-shaped portion in the path of the first conductor, the current distribution of the second conductor is similarly close to the current distribution of the first conductor due to the magnetic coupling of each part.

  Therefore, regardless of the route of the first wiring, the absolute value of the current flowing through the first conductor and the second conductor in each wiring portion is less likely to be unbalanced, and thus the device is a complicated connection device. However, the leakage magnetic flux is effectively reduced.

  Further, in this embodiment, the outer conductor that is coaxial is used as the second conductor. Therefore, for example, when one location of the second conductor is connected to the ground (earth), the second conductor is electrostatically connected. It also acts as a shield and can reduce electrostatic noise.

(Example 2)
FIG. 3 shows a circuit diagram of the leakage flux reducing apparatus in the second embodiment of the present invention.

  In FIG. 3, compared with Example 1, all assignments of the first conductor and the second conductor are reversed, and the outer side of the coaxial configuration shown in the sectional view of FIG. 32, 33, 34, 35, 36, 37, 38 and the center is the second conductor 51, 52, 53, 54, 55, 56, 57, 58, but for the other parts This is exactly the same as Example 1.

  Also in this example, the first conductor and the second conductor of each part can obtain good magnetic coupling by the iron toroidal magnetic cores 61, 62, 63, 64, 65, 66, 67, 68. Become.

  In this embodiment, since the closed circuit is formed by the second conductor at the center, the connection between the second conductors is relatively simple, and the AC power source 1, the loads 2, 3, the switches 4, 5 Since the first conductor to be connected to the outside is on the outside, it is easy to connect to those constituent elements and can be manufactured easily.

  In this embodiment, eight toroidal magnetic cores 61, 62, 63, 64, 65, 66, 67, 68 are used, but the number may be increased. On the contrary, for example, only a small number of toroidal magnetic cores 63 and 67 may be used.

  Further, in this embodiment, the outer part is the first conductor in all parts of the circuit, but the part that uses the part as the first conductor and the part that uses the center as the first conductor, You can mix them.

(Example 3)
FIG. 4 shows a circuit diagram of the leakage flux reducing apparatus in the third embodiment of the present invention.

In FIG. 4, instead of the toroidal magnetic core used in Example 1, the first conductor 3
1, 32, 33, 34, 35, 36, 37, 38 and magnetic layers 91, 92, 93, 94, which wrap the second conductors 51, 52, 53, 54, 55, 56, 57, 58, 95, 96, 97, and 98, and other configurations are the same as those in the first embodiment.

  FIG. 5 shows a cross-sectional view of coaxial wiring used in each part of the present embodiment.

  Although it is the same as that of Example 1 to the place where the 1st conductor 31, the insulating layer 84 made from polyethylene, the 2nd conductor 51, and the insulating layer 85 made from a vinyl chloride are provided in order from the center, this implementation In the example, the magnetic layer 91 made of permalloy, which is an iron-nickel alloy and has a very high magnetic permeability, and the outer insulating layer 100 is provided.

  With the configuration as described above, the leakage magnetic flux reduction device of the present embodiment is thin because it has the magnetic layers 91, 92, 93, 94, 95, 96, 97, and 98 with extremely high magnetic permeability. Even a magnetic layer having a thickness can provide sufficient magnetic coupling between the first conductor and the second conductor, so that the wiring can be easily performed. Bending can also be performed relatively easily.

  In this embodiment, it is assumed that a magnetic layer made of permalloy is used, but not limited to permalloy, for example, amorphous may be used.

  Further, it is not necessarily required that all portions have a magnetic layer, and a configuration in which a magnetic layer is partially provided may be used.

Example 4
FIG. 6 shows a circuit diagram of the leakage flux reducing apparatus in the fourth embodiment of the present invention.

  In FIG. 6, the first conductors 101, 102, 103, 104, 105, 106, 107, 108 and the second conductors 111, 112, 113, 114, 115, 116, 117, 118 are all made of vinyl. The structure is generally called a twisted pair, etc., in which two wires are used.

  Further, magnetic layers 121, 122, 123, 124, 125, 126, 127, 128 made of nickel tubes are provided in each part.

  In this embodiment, since the first conductor and the second conductor are constituted by the interlaced wires, the magnetic coupling is good, and therefore, a sufficient current flows through the second conductor, and The effect that the magnetic flux generated by the current cancels the magnetic flux generated by the first conductor is also high.

  Further, in this embodiment, since the nickel magnetic layer is circulated, the magnetic coupling between the first conductor and the second conductor is further increased, and the effect of reducing the leakage magnetic flux is very large.

  However, it is not absolutely necessary to provide a magnetic layer, and if there is a sufficient effect of reducing leakage magnetic flux just by combining the first conductor and the second conductor, there is no magnetic layer. It may be a configuration.

(Example 5)
FIG. 7 shows a circuit diagram of the leakage flux reducing apparatus in the fifth embodiment of the present invention.

  In FIG. 7, an enameled wire 50 is wound around an EI-type laminated iron core, and current transformers 131 and 132 having magnetic coupling are provided. In addition to being connected to the windings 133 and 135, the second conductors 137 and 138 are connected to the secondary windings 134 and 135, and the second conductors 137 and 138 constitute a closed circuit. .

  In the above configuration, the leakage flux reducing apparatus according to the present embodiment is configured so that when the current supplied to the load 2 flows through the first conductor 129, the current transformer 131 causes the current to be approximately the same as that of the primary winding 133. The value flows from the secondary winding 134 to the second conductor 137.

  Here, since the current flowing through the second conductor 137 is directed in the direction opposite to that of the first conductor 129, the magnetic flux is canceled out and the effect of reducing the leakage magnetic flux is generated.

  Similarly, for the load 3, a current is supplied to the second conductor 138 by the current transformer 132, and the magnetic flux is canceled out.

  In this embodiment, since the current transformers 131 and 132 are used in particular, a very high magnetic coupling between the first conductor and the second conductor can be realized, and thus a high leakage magnetic flux reduction effect is achieved. Is obtained.

  In this embodiment, the primary windings 133 and 135 and the secondary windings 134 and 136 both use 50 turns of enameled wire, so that the reverse current is almost the same size. The number of turns of the primary winding and the number of turns of the secondary winding do not have to be the same, for example, the number of turns of the secondary winding is the primary. If the number of turns of the winding is increased to reduce the secondary winding current, the leakage flux reduction effect is slightly weakened, but the copper loss generated in the second conductors 137 and 138 can be reduced. This is effective when the required effect of reducing leakage magnetic flux may be small.

  Also, if the number of turns of the secondary winding is less than the number of turns of the primary winding, the current flowing through the secondary winding will increase or, for example, when the permeability of the core of the current transformer is low In some cases, the exciting current may be required considerably, and as a result, the ampere-turn product of the secondary winding may be considerably smaller than the ampere-turn product of the primary winding. It is also possible to have the effect of

(Example 6)
FIG. 8 shows a circuit diagram of the leakage flux reducing apparatus in the sixth embodiment of the present invention.

  In FIG. 8, the wirings of the secondary windings 134 and 136 of the current transformers 131 and 132 are slightly changed from those in the fifth embodiment.

  In FIG. 8, on the AC power supply 1 side, the second conductor 139 is one, so that the total current flowing in the second conductors 137 and 138 in Example 5 is the second conductor of this example. The current flows through the conductor 139.

  The other parts are exactly the same as in the fifth embodiment.

In other words, even if the wiring of the second conductor is changed, if the circuit has a closed circuit, a current flows through the closed circuit, so that a magnetomotive force opposite to that of the first conductor is generated. As a result, the effect of canceling out the magnetic flux can be obtained, so that the effect of reducing the leakage magnetic flux can be obtained.

(Example 7)
FIG. 9 shows a circuit diagram of the leakage flux reducing apparatus in the seventh embodiment of the present invention.

  In FIG. 9, a current transformer 137 is provided in addition to the current transformers 131 and 132 of the sixth embodiment. The current transformer 137 connects the primary winding 142 to the AC power supply 1 in series, and the secondary winding 143 is It is connected to the second conductor 144 to form a closed circuit.

  In the present embodiment, since the current transformer 137 is provided in the vicinity of the AC power source 1 in particular, the current flowing through the second conductor in the vicinity of the AC power source 1 becomes sufficient, and leakage from that portion. Magnetic flux is reduced more effectively.

1 is a circuit diagram of a leakage flux reducing device in a first embodiment of the present invention. Sectional drawing of the first conductor and the second conductor Circuit diagram of leakage flux reducing apparatus in second embodiment of the present invention Circuit diagram of leakage flux reducing apparatus in third embodiment of the present invention Sectional drawing of the first conductor, the second conductor, and the magnetic layer Circuit diagram of leakage flux reducing apparatus in fourth embodiment of the present invention Circuit diagram of leakage flux reducing apparatus in fifth embodiment of the present invention Circuit diagram of leakage flux reducing apparatus in sixth embodiment of the present invention Circuit diagram of leakage flux reducing apparatus in seventh embodiment of the present invention Circuit diagram of equipment in the prior art Same operation diagram

1 AC power supply 31, 32, 33, 34, 35, 36, 37, 38, 101, 102, 103, 104, 105, 106, 107, 108, 129, 130 First conductor 2, 3 Load 51, 52, 53, 54, 55, 56, 57, 58, 111, 112, 113, 114, 115, 116, 117, 118, 137, 138, 139 Second conductor 61, 62, 63, 64, 65, 66, 67 68 Toroidal magnetic core 91, 92, 93, 94, 95, 96, 97, 98, 121, 122, 123, 124, 125, 126, 127, 128 Magnetic layer 131, 132, 141 Current transformer 133, 135, 142 Primary winding 134, 136, 143 Secondary winding

Claims (7)

A plurality of loads that receive power supply from an AC power source, a switch connected in series to the load, a first conductor having a branch that electrically connects the AC power source and the load, and the first conductor; and a second conductor which is magnetically coupled, the second conductor, forms a closed circuit, flows circulating a closed circuit of the second conductor to a current in the opposite direction of flow in the first conductor A leakage magnetic flux reduction device in which a magnetic flux caused by a current cancels a magnetic flux caused by a current flowing through the first conductor. The leakage magnetic flux reduction device according to claim 1, further comprising a toroidal magnetic core, wherein the first conductor and the second conductor are passed through the toroidal magnetic core. The leakage magnetic flux reduction device according to claim 1, further comprising a magnetic layer that wraps the first conductor and the second conductor. The leakage magnetic flux reduction device according to claim 3, wherein the magnetic layer uses permalloy. The leakage magnetic flux reduction device according to claim 1, further comprising a current transformer having magnetic coupling, wherein the first conductor and the second conductor are respectively connected to a primary winding and a secondary winding of the current transformer. The leakage magnetic flux reduction device according to claim 1, wherein the first conductor and the second conductor depend on each other. The leakage magnetic flux reduction apparatus according to any one of claims 1 to 5, wherein the first conductor and the second conductor are coaxial.

Images