JPH10225021A - Electromagnetic induction coupling device and electric power supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of an electromagnetic induction device and thereby reduce the size of a electric power supplying device by installing third coils which are wound at the positions at least a specified distance away from the positions where a first and a second coil are wound and require no magnetic coupling with the first and the second coil. SOLUTION: A primary coil L1A and a filter coil 4 are wound around one and the same core 8 and a primary coil L1B and a choke coil 4 are wound around one and the same core 9. At that time, the primary coil L1A and the filter coil 4 are wound a specified distance away at one and the other end of the core 8 and the primary coil L1B and the choke coil 3 are wound a specified distance away at one and the other end of the core 9. By this method, interlinkage between magnetic flux appearing in the choke coil 3 and the filter coil 4 and that appearing in the primary coils L1A and L1B and a secondary coil L2 is decreased and thereby the appearance of noise due to the interference between the coils can be prevented. At the same time, the number of cores located in the system can be reduced and the configuration of the system is simplified and the size is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order.

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (1) First Embodiment (FIGS. 1 and 2) (2) Second Embodiment Example (FIG. 3) (3) Third Embodiment (FIG. 4) (4) Other Embodiments (FIGS. 5 and 6) Effects of the Invention

[0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction coupling device and a power supply device, and more particularly to an electromagnetic induction coupling device and a power supply device used for a charging device for charging a secondary battery built in a portable small electronic device through a contactless terminal. It is suitable for application to a coupling device and a power supply device.

[0004]

2. Description of the Related Art In recent years, there has been an increasing demand for portable electronic devices in which a headphone stereo, a camera-integrated VTR, a mobile communication terminal device, and the like are miniaturized. These portable small electronic devices incorporate a high-capacity rechargeable secondary battery as a power supply, and are charged using a predetermined charging device.

[0005] One of such charging devices is a contact type. The contact-type charging device has, for example, a spring-type electric contact, and the electric contact of the portable small electronic device is brought into contact with the contact to electrically connect the two, and via the electric path thus formed, To supply a charging current to a secondary battery built in a portable small electronic device.

[0006] However, in such a charging device, the contact portion may be oxidized or stained in accordance with aging or the like. Such oxidation and dirt cause poor contact at the contact portions of the two, causing a problem of inhibiting supply of charging current to the secondary battery.

[0007] In order to avoid such a problem, a charging device using a non-contact charging method has been considered. As a non-contact type charging method, a means for supplying a charging current from a charging device to a secondary battery by electromagnetic induction can be considered.

That is, a primary coil is provided at the output terminal portion of the charging device, and a secondary coil is provided at the input terminal portion of the portable small electronic device. The primary coil and the secondary coil are brought close to each other. When a current flows through the primary coil in such a state, a magnetic flux is generated in the primary coil. Here, for example, when the current flowing through the primary coil is turned on and off at regular intervals,
The magnetic flux generated by the conduction of electric current changes with time. On the secondary coil side, an induced electromotive force is generated by electromagnetic induction due to the linkage of the time-varying magnetic flux. The secondary coil uses the induced electromotive force as a power supply and generates an alternating current whose direction of current is reversed as the conduction of the primary coil is turned on and off as an induced current. The non-contact type charging device performs charging by supplying the induced current generated in the secondary coil as a charging current to the secondary battery.

In this way, the primary coil on the charging device side and the secondary coil on the portable small electronic device side are brought close to each other during charging, and the primary coil side to the secondary coil side are used by magnetic coupling by electromagnetic induction. A non-contact charging device can be obtained by transmitting power to the battery.

[0010]

In the charging device having such a configuration, not only a primary coil for supplying power and a secondary coil for receiving supplied power, but also a coil which is an inductance element is provided. Used. For example, a charging device is provided with a yoke coil for removing high-frequency components from the power supply current, a filter coil for removing noise components from the current conducted to the primary coil, and the like. Are wound around a core and arranged in the charging device.

For this reason, a space for accommodating a plurality of cores each of which is wound with each of the coils is required in the charging device, and there is a problem that the miniaturization of the charging device is hindered.

The present invention has been made in view of the above points, and an object of the present invention is to propose an electromagnetic induction coupling device and a power supply device that can be easily downsized.

[0013]

According to the present invention, there is provided a core for winding first and second coils, and a first and second coil wound on the core. And a third coil that does not require magnetic coupling with the first and second coils and has a winding position that is at least a predetermined length or more from the winding position.

By providing a predetermined distance or more between the winding positions of the first and second coils and the winding position of the third coil, the distance between the first and second coils and the third coil is increased. By deliberately lowering the coupling coefficient between the two depending on the distance, the first
And interference of the magnetic flux generated in the third coil with the magnetic flux generated in the second coil can be prevented.
In addition, the second coil and the third coil can be wound while sharing the same core.

Further, in the present invention, a core around which the first and second coils are wound, a magnetic flux shielding means formed on a peripheral side surface of the core, and a predetermined position where the magnetic flux shielding means is formed are defined as winding positions. , A third coil that does not require magnetic coupling with the first and second coils.

By shielding the magnetic flux generated in the third coil by the magnetic flux shielding means, it is possible to prevent interference of the magnetic flux generated in the third coil with the magnetic flux generated in the first and second coils. The first and second coils and the third coil can be wound while sharing the same core.

Further, in the present invention, a first core for winding a first coil, a second core for winding a second coil, and a first or second core are provided. A third coil that does not require magnetic coupling with the first or second coil, wherein a winding position is at least a predetermined length or more from the winding position of the first or second coil; Is provided.

The distance between the winding position of the first or second coil and the winding position of the third coil is made longer than a predetermined length, so that the distance between the first or second coil and the third coil is increased. The coupling coefficient between the two is intentionally reduced by the distance of
Alternatively, it is possible to prevent the magnetic flux generated in the third coil from interfering with the magnetic flux generated in the second coil.
Alternatively, the second coil and the third coil may be wound while sharing the same core.

In the present invention, a first core for winding the first coil, a second core for winding the second coil, and a peripheral surface of the first or second core are formed. A magnetic flux shielding means and a third coil which does not require magnetic coupling with the first or second coil and has a predetermined position where the magnetic flux shielding means is formed as a winding position.

By shielding the magnetic flux generated in the third coil by the magnetic flux shielding means, it is possible to prevent interference of the magnetic flux generated in the third coil with the magnetic flux generated in the first or second coil. It is possible to wind the first or second coil and the third coil sharing the same core.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) First Embodiment In FIG. 1, reference numeral 1 denotes a charging device as a whole, which transmits power supplied from a power supply to a predetermined electronic device via an electromagnetic induction unit 2 and transmits the transmitted power. Charging is performed by supplying the battery to a secondary battery in the electronic device.

The electromagnetic induction section 2 includes a first
Primary coils L1A and L1B, and a secondary coil L2 as a second coil disposed on the electronic device side, so that the primary coils L1A and L1B and the secondary coil L2 are in a non-contact state. I have. The primary coils L1A and L1B have one terminal connected to a power supply 5 via a third coil, a yoke coil 3 and a filter coil 4, and the secondary coil L2 has both terminals connected to a secondary battery. (Not shown). The charging device 1 controls the power transmitted from the power source 5 by 1
The power is supplied to the electronic device by transmitting the power from the secondary coils L1A and L1B to the secondary coil L2, and the supplied power is supplied to a secondary battery in the electronic device as charging power.

The charging device 1 has the other terminal of the primary coil L1 connected to the drive circuit 6, and the drive circuit 6 connected to the drive frequency generator 7. The drive frequency generator 7 generates an oscillation signal having a predetermined frequency and supplies the oscillation signal to the drive circuit 6.
The drive circuit 6 inputs a given oscillation signal to a base electrode of a transistor whose emitter is grounded. The transistor conducts current between the emitter electrode and the collector electrode when the voltage level of the oscillation signal input to the base electrode is positive. As a result, the current sent from the power supply 5 is changed to the primary coil L1
Flow to A and L1B. When the voltage level of the oscillation signal input to the base electrode becomes a negative value, the transistor cuts off the conduction between the emitter electrode and the collector electrode.

In the state where the conduction is cut off, the current sent from the power supply 5 does not flow through the primary coils L1A and L1B,
An LC circuit including the primary coils L1A and L1B and the capacitor of the drive circuit 6 forms a resonance circuit, and the primary coil L1
Back electromotive force is generated in 1A and L1B. The LC circuit is
The capacitor is charged using the back electromotive force as a power source, and the capacitor discharges a charging current to the primary coils L1A and L1B, so that currents in opposite directions flow through the primary coils L1A and L1B. The current increases as the voltage of the capacitor decreases, and reaches a maximum when the voltage of the capacitor becomes zero. Thereafter, the capacitor is charged with the opposite voltage. When the charging voltage exceeds the power supply voltage, the LC circuit is short-circuited because the damper diode in the driving circuit 6 is turned on, and the oscillation of the current stops and the primary coil L1
The current flowing through A and L1B decreases linearly. When the current becomes 0 in this way, the transistor is turned on, and thereafter, the above operation is repeated. As described above, the current flowing through the primary coils L1A and L1B alternately flows in the forward and reverse directions by the drive circuit 6 and oscillates. Therefore, the waveform of the voltage generated in the primary coils L1A and L1B is the drive frequency. It has a horizontal pulse shape that changes based on the frequency of the oscillation signal sent from the generator 7 (not shown).

When a current flows, the primary coil L1A
And L1B, a magnetic flux is generated, and the magnetic flux changes with time according to the above-described vibration of the current. Further, an induced electromotive force is generated in the secondary coil L2 based on the linkage of the time-varying magnetic flux to the secondary coil L2. Therefore, the secondary coil L
2, a current flows in which the direction of the induced electromotive force is reversed in accordance with the time change of the magnetic flux, and the current is oscillated by the secondary coil L2 and an LC circuit including a capacitor connected in parallel to the secondary coil L2. Resonance). The AC induced current obtained by such resonance is supplied to the secondary battery after being rectified and thus charged.

Here, as shown in FIG.
The secondary coils L1A and L1B are wound around one ends of the cores 8 and 9 each having a predetermined shape, and thus the primary coils L1A and L1B are arranged so that the end faces of which are wound face each other. I have. The charging device 1 is configured such that the filter coil 4 is wound around one end of the core 8 at a predetermined distance from the other end of the core 8, and the chiyo coil 3 is wound around the other end of the core 9. ing. As described above, the primary coil L1A and the filter coil 4, the primary coil L1B and the chiyoke coil 3 are wound around the cores 8 and 9 at predetermined intervals. The charging device 1 includes a primary coil L1 arranged in the device as described above.
A and L1B, Chiyoke coil 3, Filter coil 4
Are wound by sharing the cores 8 and 9, respectively.

In the above-described configuration, the primary coils L1A and L1B, the yoke coil 3, and the filter coil 4 are wound around one end and the other end of the cores 8 and 9, respectively, at predetermined intervals. I have. Conventionally, a winding core is provided for each coil, and four cores are required in the configuration of the present embodiment.

In the charging apparatus 1, the same core is shared and each coil is wound, so that the number of cores arranged in the apparatus can be reduced, and the space occupied by the cores in the apparatus can be reduced. Thus, the device can be downsized. Further, since the configuration can be simplified in this way, the cost can be reduced.

When a plurality of coils are wound around the same core, the magnetic flux generated in each coil interlinks with each other.
There is a problem that a noise component is generated in the current and voltage conducted to each coil. For example, in the core 8, the magnetic flux generated in the filter coil 4 magnetically couples with the magnetic flux generated in the primary coils L1A and L1B, which magnetically couples with the secondary coil L2 to perform electromagnetic induction, and causes noise in the primary coils L1A and L1B. There is a problem that components are mixed to cause current fluctuation and voltage fluctuation.

Since voltage and current fluctuations occurring in the primary coils L1A and L1B also affect the secondary coil L2, it is obvious that voltage and current fluctuations also occur on the secondary coil L2 side. In addition, due to the linkage between the magnetic flux generated in the filter coil 4 and the magnetic flux generated in the primary coils L1A and L1B, noise components are generated not only in the primary coils L1A and L1B but also in the filter coil 4.

The charging device 1 includes primary coils L1A and L1
B, the coil 3 and the filter coil 4 are wound around the cores 8 and 9 at predetermined intervals, so that the coupling coefficient between the coils wound around the same core can be intentionally reduced. , The magnetic fluxes generated in the yoke coil 3 and the filter coil 4 and the primary coils L1A and L1A
1B, it is possible to reduce the linkage with the magnetic flux generated in the secondary coil L2, and to prevent generation of noise due to interference between the coils.

According to the above configuration, the primary coils L1A and L1B, the chiyoke coil 3, and the filter coil 4 are wound by sharing the cores 8 and 9, respectively, and the primary coil L1A, the filter coil 4, and the primary coil The primary coil L1A and the filter coil 4 are wound at predetermined intervals with the winding positions of the coil L1B and the chi-yoke coil 3 as one and the other ends of the cores 8 and 9, respectively.
The primary coil L1A and L1B of the magnetic flux generated in the chiyoke coil 3 and the filter coil 4 can be wound around the same core while the coupling coefficient between the primary coil L1B and the chiyoke coil 3 is intentionally reduced. Linkage to the magnetic flux generated in the next coil L2 can be reduced to prevent generation of noise due to interference between the coils, and the number of cores arranged in the device is reduced to simplify the configuration, thereby reducing the size of the device. Can be

(2) Second Embodiment In FIG. 3, in which parts corresponding to those in FIG. 2 are assigned the same reference numerals, reference numeral 11 designates an electromagnetic induction part of the charging device 10 as a whole, Similarly to the electromagnetic induction section 2, the coil yoke 3 and the filter coil 4 are wound together with the primary coil L1A or L1B while sharing a core.

The charging device 10 transmits the power supplied from the power supply to a predetermined electronic device via the electromagnetic induction unit 11 and supplies the transmitted power to a secondary battery in the electronic device to charge the battery. Is similar to that of the charging device 1.

That is, the charging device 10 drives the drive circuit 6 based on the frequency of the oscillation signal generated by the drive frequency generation unit 7 to conduct and cut off the conduction of the power supply current supplied from the power supply 5 to the primary coils L1A and L1B. Control, thereby generating a time-varying magnetic flux in the primary coils L1A and L1B. The magnetic flux thus generated is linked to the secondary coil L2, thereby generating an induced electromotive force in the secondary coil L2,
The induced current flows by reversing the direction of the induced electromotive force according to the time change of the magnetic flux. The induced current is generated by the secondary coil L2 and a capacitor connected in parallel to the secondary coil L2.
Vibrates (resonates) by the C circuit. The AC induced current obtained by such resonance is supplied to the secondary battery after being rectified, and the secondary battery is thus charged (FIG. 1).

As shown in FIG. 3A, in the electromagnetic induction section 11 of the charging device 10, the primary coils L1A and L1
B, the shapes of the cores around which the yoke coil 3 and the filter coil 4 are wound are different from the cores 8 and 9 of the electromagnetic induction section 2. That is, the electromagnetic induction section 11 is provided with cores 12 and 13 instead of the cores 8 and 9, and the cores 12 and 1 are provided.
3 are wound with primary coils L1A and L1B, a yoke coil 3, and a filter coil 4, respectively.

The cores 12 and 13 have a shape in which a groove is formed as a magnetic flux shielding means at a predetermined position on the peripheral side surface. For example, in the charging device 10, as shown in FIG. The shape is such that a second cylinder having a smaller diameter than the diameter of the first cylinder is provided. The core 12 has the primary coil L1A on one side of the second cylindrical portion and the filter coil 4 on the other side, and the core 13 has the primary coil L1B on one side of the second cylindrical portion and the chiyo coil 3 on the other side. It is made to wind.

The charging device 10 thus operates the primary coil L1
A and L1B, primary coils L1A and L of cores 12 and 13 wound with a yoke coil 3 and a filter coil 4, respectively.
The electromagnetic induction part 11 is formed by arranging the wound end faces of 1B so as to face each other. By arranging the secondary coil L2 between the end faces of the opposing cores 12 and 13, the charging device 10 starts charging the secondary battery in the electronic device having the secondary coil L2.

In the above configuration, the charging device 10 supplies the electric power supplied from the power supply 5 via the electromagnetic induction section 11 to the electronic device having the secondary coil L2, whereby the charging device 10 is provided in the electronic device. Charge the secondary battery.

Here, the charging device 10 is provided with grooves at predetermined positions on the peripheral side surfaces of the cylindrical cores 12 and 13, and the primary coils L1A and L1B, the chiyoke coil 3, and the filter coil 4 are wound around the grooves. Has been made.

In the primary coils L1A and L1B wound around the cores 12 and 13, the yoke coil 3, and the filter coil 4, the primary coils L1A and L1B are used to supply power to the secondary coil L2 by electromagnetic induction. Although the coil requires magnetic coupling, the chiyoke coil 3 and the filter coil 4 do not require magnetic coupling with the primary coils L1A and L1B. For this reason, the magnetic flux generated in the yoke coil 3 and the filter coil 4 generates the primary coil L1A.
Or, when the magnetic flux generated in L1B is linked and interferes, a noise component is generated in the current conducted to the primary coil L1A or L1B, and the power transmitted to the secondary coil L2 becomes unstable, voltage drop, etc. Will be caused. Therefore, the same yoke coil 3,
When the filter coil 4 is wound together with the primary coil L1A or L1B, it is necessary to prevent the magnetic flux generated in the yoke coil 3 and the filter coil 4 from interfering with the magnetic flux generated in the primary coils L1A and L1B.

The charging device 10 includes the core 12 as described above.
And 13 are wound in such a manner that each coil is buried in a groove portion formed on the peripheral side surface, so that the coil between the filter coil 4 and the primary coil L1A, and the chiyoke coils 3 and 1
Interlinkage of the magnetic flux between the next coils L1B can be prevented by blocking the magnetic flux by the wall surface of the groove, and noise can be prevented from being generated in the current conducted to the coil due to interference between the coils. . The primary coils L1A and L1B
Since no wall is provided between the coils, the magnetic flux can be linked to the secondary coil L2 disposed between the coils without any problem.

Also, by sharing the same core in this way and winding the primary coils L1A and L1B, the chiyoke coil 3, and the filter coil 4, the number of cores disposed in the apparatus can be reduced, and The space occupied by the core can be reduced, and the size of the device can be reduced. Further, since the configuration can be simplified in this way, the cost can be reduced.

Further, as described above, the chi-yoke coil 3,
Since the magnetic flux generated in the filter coil 4 is shielded by the wall surface of the groove portion, a sufficient shielding effect can be obtained even when the distance between the primary coils L1A and L1B is short. , 13 can be shortened, and the electromagnetic induction section 11 can be further miniaturized.

According to the above configuration, the cores 12 and 13 having grooves formed along the peripheral side surface are provided, and the primary coils L1A and L1B, the chiyo coil 3, and the filter coil 4 are wound around the grooves. As a result, the coils can be wound while sharing the same core, and the filter coil 4 and the primary coil L1 can be wound by blocking the magnetic flux by the wall surface of the groove.
It is possible to avoid the magnetic flux linkage between A and between the yoke coil 3 and the primary coil L1B, and thus reduce the space occupied by the cores in the device by reducing the number of cores arranged in the device. It is possible to reduce the size and to prevent generation of noise in the current conducted to the coils due to interference between the coils.

(3) Third Embodiment In FIG. 4, in which parts corresponding to those in FIG. 2 are assigned the same reference numerals, reference numeral 21 designates an electromagnetic induction part of the charging device 20 as a whole, and the chiyo coil 3 and the filter coil 4 are designated by one. It is wound around the same core together with the next coil L1A.

Here, the charging device 20 transmits electric power supplied from a power supply to a predetermined electronic device via the electromagnetic induction section 21 and supplies the transmitted electric power to a secondary battery in the electronic device to perform charging. Is similar to that of the charging device 1.

That is, the charging device 20 drives the drive circuit 6 based on the frequency of the oscillation signal generated by the drive frequency generation unit 7 to conduct and cut off the conduction and interruption of the power supply current supplied from the power supply 5 to the primary coils L1A and L1B. Control, thereby generating a time-varying magnetic flux in the primary coils L1A and L1B. The magnetic flux thus generated is linked to the secondary coil L2, thereby generating an induced electromotive force in the secondary coil L2,
The induced current flows by reversing the direction of the induced electromotive force according to the time change of the magnetic flux. The induced current is generated by the secondary coil L2 and a capacitor connected in parallel to the secondary coil L2.
Vibrates (resonates) by the C circuit. The AC induced current obtained by such resonance is supplied to the secondary battery after being rectified, and the secondary battery is thus charged (FIG. 1).

As shown in FIG. 4, in the electromagnetic induction section 21 of the charging device 20, the primary coil L1A, the chiyoke coil 3, and the filter coil 4 are wound in a predetermined winding order. It is different from the cores 8 and 9 of the electromagnetic induction section 2. That is, the electromagnetic induction portion 21 is
Cores 22 and 23 are provided in place of
2, the primary coil L1A, the chiyoke coil 3 and the filter coil 4 are wound, and the core 23 is wound with the primary coil L1B.

The core 22 has one end at one end in the winding order for winding the yoke coil 3 and the filter coil 4.
The secondary coil L1A is wound, and the current waveform of the conductive current is wound toward the other end in order from the one approximated to the current waveform conducted to the primary coil L1A. Here, the primary coil L1A, the filter coil 4, and the yoke coil 3 are sequentially wound in the order from the output end to the input end.

The distance between the coils wound in this way and the primary coil L1A is set to be a predetermined distance in accordance with the degree of approximation. More specifically, AT (Ampere-Turn) is a product of the amount of conductive current and the number of turns of the coil.
), That is, the interval is set according to the magnetomotive force. Since a coil having a larger magnetomotive force has a greater effect on the primary coil L1A, interference between the coils is further reduced by setting an interval between the coil and the primary coil L1A.

The charging device 20 thus operates the primary coil L1
A, the end faces of the core 22 around which the yoke coil 3 and the filter coil 4 are wound and the core 23 around which the primary coil L1B is wound face the winding side of the primary coil L1A and the winding side of the primary coil L1B. The electromagnetic induction part 21 is formed by arranging the electromagnetic induction part 21 in the state where it is set. By arranging the secondary coil L2 between the end faces of the opposing cores 22 and 23 in this way, the charging device 20 starts charging the secondary battery in the electronic device having the secondary coil L2.

In the above configuration, the charging device 20 supplies the electric power supplied from the power supply 5 to the electronic device having the secondary coil L2 via the electromagnetic induction section 21, and is thereby provided in the electronic device. Charge the secondary battery.

Here, the charging device 20 is wound around a cylindrical core 22 in the order of the primary coil L1A, the filter coil 4, and the chiyoke coil 3 from one end to the other end. I have.

The primary coil L1A wound around the core 22,
In the yoke coil 3 and the filter coil 4, the primary coil L1A is a coil that requires magnetic coupling in order to supply power to the secondary coil L2 by electromagnetic induction, whereas the primary coil L1A is a primary coil L1A.
This coil does not require magnetic coupling with the coil. For this reason, if the magnetic flux generated in the yoke coil 3 and the filter coil 4 interferes with the magnetic flux generated in the primary coil L1A,
A noise component is generated in the current conducted to the secondary coil L1A, and the power transmitted to the secondary coil L2 becomes unstable, causing a voltage drop and the like. Therefore, when the same yoke coil 3 and the filter coil 4 are wound together with the primary coil L1A while sharing the same core, the interference of the magnetic flux generated in the chiyoke coil 3 and the filter coil 4 with the magnetic flux generated in the primary coil L1A is reduced. Need to be prevented.

The charging device 20 includes the core 22 as described above.
The primary coil L1A, the filter coil 4, and the yoke coil 3 are sequentially wound from one end toward the other end. In this way, the order of connection from the output end to the input end, that is, the current having a waveform similar to the waveform of the current conducted to the primary coil L1A, is turned from the one conducting the current to the position near the primary coil L1A. By doing so, it is possible to reduce interference with the current conducted to the other coils, which is generated in accordance with the difference component of the current conducted to each coil, and to reduce the current conducted to the coil due to the interference between the coils. Generation of noise can be prevented.

In addition, since the same core is shared to wind the primary coil L1A, the yoke coil 3, and the filter coil 4, the number of cores disposed in the apparatus can be reduced, and the number of cores in the apparatus can be reduced. The space occupied can be reduced and the device can be miniaturized. Further, since the configuration can be simplified in this way, the cost can be reduced. Further, as described above, the primary coil L1A is switched from the one that conducts a current having a waveform similar to the waveform of the current conducted to the primary coil L1A.
, It is possible to sufficiently prevent interference between the coils even when the distance from the primary coil L1A is short, thereby shortening the major diameter of the core 22 and reducing The guide section 21 can be further reduced in size.

According to the above configuration, the primary coil L1A, the filter coil 4, and the chiyoke coil 3 are sequentially wound in the order of the other end from one end of the core 22 and are electrically conducted to the primary coil L1A. By winding a current having a waveform similar to the waveform of the current from a conductive one to a position near the primary coil L1A, other coils generated in accordance with a difference component of the current conducted to each coil are generated. In this way, it is possible to reduce interference with the electric current conducted to the device, thereby reducing the number of cores arranged in the device, reducing the space occupied by the cores in the device, and reducing the size of the device. It is possible to prevent noise from occurring in the current conducted to the coil due to the interference.

(4) Other Embodiments In the above-described first embodiment, the primary coil L1A and the filter coil 4 are used for the core 8, and the primary coil L1B is used.
And the yoke coil 3 are wound around the core 9 at predetermined intervals at one end and the other end of the core, but the present invention is not limited to this.
For example, the coil 8 may be wound around the core 8 and the filter coil 4 may be wound around the core 9. If a core having a sufficient length can be provided, three or more coils may be wound around one core. For example, a primary coil L1A may be wound around one end of the core 8. , Primary coil L1
A filter coil 4 is provided at a central portion at a predetermined interval from A,
The yoke coil 3 may be wound around the other end at a predetermined distance from the filter coil 4.

In the above-described first to third embodiments,
The power supplied by the power supply 5 is converted into a primary coil L by electromagnetic induction.
Charging devices 1, 10, which charge the secondary battery by transmitting the secondary coil L <b> 2 from 1 </ b> A and L <b> 1B to the secondary battery in the electronic device provided with the secondary coil L <b> 2
Although the case where the present invention is applied to No. 20 has been described, the present invention is not limited to this, and may be applied to other devices as long as the device has an inductance element wound around a core.

In the second embodiment, the core 1
The primary coil L1 is inserted into a groove formed at one end of each of the secondary coils L1 and L2.
A and L1B are respectively wound, and the yoke coil 3 and the filter coil 4 are wound in the groove formed at the other end. However, the present invention is not limited to this.
For example, at one end where the primary coils L1A and L1B are wound, the primary coil L1A is formed without forming a groove.
And L1B. Since the magnetic flux generated in the yoke coil 3 and the filter coil 4 is cut off by the wall surface of the groove, the linkage with the magnetic flux generated in the primary coils L1A and L1B can be avoided. Almost the same effects as in the embodiment can be obtained.

In the second embodiment, the core 1
Although the case where grooves are formed at one end and the other end of each of the coils 2 and 13 and each coil is wound has been described, the present invention is not limited to this. And the coil may be wound so as to bury the yoke coil 3 and the filter coil 4 in the groove. Thereby, wall surfaces can be provided on both sides of the groove portion, and the magnetic flux generated in the yoke coil 3 and the filter coil 4 can be more reliably blocked.

At this time, the primary coils L1A and L1A
The 1B side may also be surrounded by the core. That is, as shown in FIG. 5, a core having a U-shape is formed,
The primary coils L1A and L1B are surrounded by the U-shaped core portion. Thereby, the primary coil L
The magnetic coupling between 1A and L1B and the secondary coil L2 can be closed within the U-shaped core portion, and the interference of the magnetic flux generated in the yoke coil 3 and the filter coil 4 can be more reliably prevented.

Further, in the above-described second embodiment, the case where grooves are formed at one end and the other end of the cores 12 and 13 and each coil is wound has been described. The present invention is not limited to this. For example, as shown in FIG. 6, in a state where each coil is wound around a cylindrical core, a lid-shaped core is disposed as a magnetic flux shielding means at a winding position of the yoke coil 3 and the filter coil 4. It may be. Thereby, the magnetic fluxes generated by the yoke coil 3 and the filter coil 4 can be confined and shielded in the core having the lid shape, and the interference with the magnetic fluxes generated in the primary coils L1A and L1B can be more reliably prevented. The lid-shaped core may have either a shape covering the entire peripheral side surface of the core or a shape covering a part of the peripheral side surface, and may be formed according to a desired shielding effect.

In the second embodiment, the core 1
Although the case where each coil is wound in a groove formed on the peripheral side surface of each of 2 and 13 has been described, the present invention is not limited to this, and the winding is performed in a state where a part of each coil projects from the groove portion. You can turn it. That is, it may be determined whether or not each coil is completely embedded in the groove according to the desired shielding effect.

In the above-described third embodiment, the case where the current having a waveform similar to the waveform of the current conducted to the primary coil L1A is sequentially wound around a position near the primary coil L1A, starting from the one conducting the current. As described above, the present invention is not limited to this. For example, winding may be sequentially performed in the order of approximation of the phase of the current waveform or in the order of approximation of the frequency.

In addition to the above-described winding order for all coils wound on the same core, the above-described winding order is applied only to the input end and output end coils, and the winding is applied to both ends of the core. You may make it rotate.

Further, in the above-described third embodiment, the case where the current having a waveform similar to the waveform of the current conducted to the primary coil L1A is successively wound to a position near the primary coil L1A, starting from the one conducting the current. As described above, the present invention is not limited to this. For example, when the frequency components conducted to the respective coils are substantially the same, those having different polarities of the generated magnetic flux may be wound at adjacent positions. Thus, even when interference of magnetic flux occurs between adjacent coils, the interference between the coils can be reduced because the polarity of the generated magnetic flux is inverted.

When the same frequency components cannot be obtained, that is, when a pulse width modulation section (not shown) is provided between the power supply 5 and the electromagnetic induction section 2 (FIG. 1), the primary coil L
When voltage control is performed in response to a change in current or voltage conducted to 1A and L1B, frequency components differ between the voltage control portion by the pulse width modulator and the primary coils L1A and L1B. Will be. In such a case, the oscillation signal generated by the drive frequency generation unit 7 is supplied to the pulse width modulation unit to obtain an approximation of the frequency component, or the oscillation circuit that supplies the oscillation signal to the pulse width modulation unit supplies the oscillation signal to the pulse width modulation unit. The oscillation signal generated by the unit 7 may be supplied as a synchronization signal.

[0071]

As described above, according to the present invention, the core for winding the first and second coils, the winding position of the first and second coils wound around the core, and A third coil, which does not require magnetic coupling with the first and second coils, is provided with a winding position at a position having an interval of at least a predetermined length, and winding of the first and second coils. By separating the winding position and the winding position of the third coil by a predetermined length or more, the coupling coefficient between the first and second coils and the third coil is intentionally reduced by the distance between the first and second coils and the third coil. , The interference of the magnetic flux generated in the third coil with the magnetic flux generated in the first and second coils can be prevented, and the first and second coils and the third coil share the same core. Can be wound,
Thus, it is possible to realize an electromagnetic induction coupling device that can facilitate downsizing.

According to the present invention, the core for winding the first and second coils, the magnetic flux shielding means formed on the peripheral side surface of the core, and the predetermined position where the magnetic flux shielding means is formed are defined as winding positions. And a third coil which does not require magnetic coupling with the first and second coils, thereby shielding magnetic flux generated in the third coil by magnetic flux shielding means, thereby providing the first coil. And the third for the magnetic flux generated in the second coil.
Can prevent the interference of the magnetic flux generated in the coil,
The first and second coils and the third coil can be wound while sharing the same core, thereby realizing an electromagnetic induction coupling device that can be easily reduced in size.

Further, according to the present invention, the first core for winding the first coil, the second core for winding the second coil, and the first or second core. A third coil that does not require magnetic coupling with the first or second coil, wherein a winding position is at least a predetermined distance or more from a winding position of the first or second coil. And the first
Alternatively, the distance between the winding position of the second coil and the winding position of the third coil is separated by a predetermined length or more, so that the first or second
The coupling coefficient between the first coil and the third coil is intentionally reduced by the distance between the first coil and the third coil, and the interference of the magnetic flux generated in the third coil with the magnetic flux generated in the first or second coil. Can be prevented, and the first or second coil and the third coil can be wound while sharing the same core, thereby achieving a power supply device that can be easily reduced in size.

According to the invention, the first core for winding the first coil, the second core for winding the second coil, and the peripheral surface of the first or second core are formed. Magnetic flux shielding means, and a third coil which does not need to be magnetically coupled to the first or second coil and has a predetermined position where the magnetic flux shielding means is formed as a winding position. By shielding the magnetic flux generated in the third coil by the
Alternatively, it is possible to prevent the magnetic flux generated in the third coil from interfering with the magnetic flux generated in the second coil, and the first or second coil and the third coil can be wound by sharing the same core. Thus, it is possible to realize a power supply device that can facilitate downsizing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a charging device according to the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of an electromagnetic induction unit according to a first embodiment of the present invention.

FIG. 3 is a schematic diagram and a perspective view showing a configuration of an electromagnetic induction unit according to a second embodiment.

FIG. 4 is a schematic diagram illustrating a configuration of an electromagnetic induction unit according to a third embodiment.

FIG. 5 is a schematic diagram illustrating a configuration of an electromagnetic induction unit according to another embodiment.

FIG. 6 is a schematic diagram illustrating a configuration of an electromagnetic induction unit according to another embodiment.

[Explanation of symbols]

1, 10, 20 ... Charging device, 2, 11, 21 ... Electromagnetic induction unit, 3 ... Coke coil, 4 ... Filter coil, 5 ... Power supply, 6 ... Drive circuit, 7 ... Drive frequency generation unit , 8, 9, 12, 13, 22, 23 ... core.

Claims (18)

[Claims] 1. An electromagnetic induction coupling device comprising a first coil and a second coil magnetically coupled by electromagnetic induction, wherein: a core for winding the first and second coils; And a third coil that does not require magnetic coupling with the first and second coils. 2. The core is formed by winding the third coil with a winding position at least a predetermined length or more from the winding position of the first and second coils. The electromagnetic induction coupling device according to claim 1, wherein: 3. The core according to claim 2, wherein the third coil comprises a plurality of coils, and the core is formed from the third coil whose waveform or phase of the conduction current approximates the waveform or phase of the conduction current of the first or second coil. 2. The electromagnetic induction coupling device according to claim 1, wherein the first and second coils are sequentially wound around a position near the winding position. 4. The third coil includes a plurality of coils, and the core includes the third coil or the second coil closest to an input terminal and the first coil near the output terminal. The electromagnetic induction coupling device according to claim 1, wherein the first coil or the third coil is wound around both ends. 5. The core according to claim 1, wherein the third coil includes a plurality of coils, and the core sequentially includes the third coil whose conduction current frequency is close to the conduction current frequency of the first or second coil. The electromagnetic induction coupling device according to claim 1, wherein the electromagnetic induction coupling device is wound around a position near the winding position of the first or second coil. 6. The core is formed by winding the third coil having a polarity different from that of the first or second coil at a position adjacent to the first or second coil. The electromagnetic induction coupling device according to claim 1. 7. An electromagnetic induction coupling device in which a first coil and a second coil are magnetically coupled by electromagnetic induction, a core for winding the first and second coils, and a core. And a third coil which does not require magnetic coupling with the first and second coils, wherein a predetermined position where the magnetic flux shielding means is formed is a winding position. An electromagnetic inductive coupling device characterized by the following. 8. The electromagnetic induction coupling according to claim 7, wherein said magnetic flux shielding means comprises a groove formed on a peripheral side surface of said core, and wherein said third coil is wound around said groove. apparatus. 9. The magnetic flux shielding means is a lid-shaped magnetic insulating member formed on the whole or a part of the peripheral side surface along the peripheral side surface of the core, and the third coil is provided in a space inside the lid. The electromagnetic induction coupling device according to claim 7, wherein the electromagnetic induction coupling device is wound. 10. A power supply device adapted to supply power to a second coil provided in a predetermined electronic device from a first coil which is in non-contact with said second coil. A first core for winding one coil; a second core for winding the second coil; and the first or second core wound around the first or second core. A third coil which does not require magnetic coupling with the coil. 11. The first or second core is wound around the third coil with a winding position at least a predetermined length or more from the winding position of the first or second coil. The power supply device according to claim 10, wherein the power supply device is formed by turning. 12. The first or second core has a plurality of third coils, and the first or second core has a waveform or phase of a conduction current approximated to a waveform or phase of a conduction current of the first or second coil. The power supply device according to claim 10, wherein the power supply device is sequentially wound from a position near the winding position of the first or second coil from the third coil. 13. The third coil includes a plurality of coils, wherein the first or second core includes a third coil or a second coil closest to an input terminal and an output terminal. The power supply device according to claim 10, wherein the first coil or the third coil which is the closest coil is wound around each of both ends. 14. The third coil comprising a plurality of coils, wherein the first or second core is connected to the third or fourth core, the frequency of the conductive current being close to the frequency of the conductive current of the first or second coil. The power supply device according to claim 10, wherein the power supply device is sequentially wound from a coil to a position near a winding position of the first or second coil. 15. The first or second core winds the third coil having a polarity different from the polarity of the first or second coil at a position adjacent to the first or second coil. The power supply device according to claim 10, wherein the power supply device is turned. 16. A power supply device adapted to supply electric power to a second coil provided in a predetermined electronic device from a first coil which is in a non-contact state with the second coil. A first core for winding one coil, a second core for winding the second coil, magnetic flux shielding means formed on a peripheral side surface of the first or second core, and the magnetic flux shielding A power supply device comprising: a third coil that does not require magnetic coupling with the first or second coil, wherein a predetermined position where the means is formed is a winding position. 17. The magnetic flux shielding means comprises a groove formed on a peripheral side surface of the first or second core, and wherein the third coil is wound around the groove. The power supply device according to claim 1. 18. The magnetic flux shielding means is a lid-shaped magnetic insulating member formed on the whole or a part of the peripheral side surface along the peripheral side surface of the first or second core, and a space inside the lid. 17. The power supply device according to claim 16, wherein the third coil is wound around the power supply.