JP5879487B2 - Contactless power supply - Google Patents

Description

  The present invention relates to a non-contact power feeding apparatus for performing non-contact electromagnetic coupling with a high-frequency current flowing in a power supply line, extracting an induced electromotive force from the high-frequency current, and supplying the power to a load.

  Patent Document 1 discloses that a plurality of pickups that extract electric power from a power supply line through which high-frequency current flows by electromagnetic induction are arranged in parallel. A plurality of pickups use the same pickup, and each is composed of a U-shaped or E-shaped core and a coil wound around one leg piece of the core, and the plurality of pickups are arranged along the feeder line. ing. Even if these multiple coils are connected in parallel and power cannot be taken out from one of the multiple coils, the power is taken out from the remaining coils, and 67% or more of the maximum power supply capacity is obtained. It becomes the structure which can be taken out.

  However, when a plurality of pickups are arranged close to each other along the power supply line, the output voltage from each pickup becomes uneven due to the mutual influence of the leakage magnetic flux in the vicinity of the coil, which may reduce the power supply efficiency.

Japanese Patent Laid-Open No. 10-234143

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a non-contact power feeding apparatus capable of taking out a large amount of power with a uniform output voltage from each pickup using a plurality of pickups. Is to provide. For this purpose, the non-contact power feeding device according to the present invention equalizes the magnetic flux density in the cores of adjacent pickups and equalizes the output voltage of each pickup in a plurality of pickups arranged along the power supply line. It solves technical problems.

  The non-contact power feeding device according to the present invention includes a pickup unit and a base.

  The pickup unit is a pickup unit that is inductively coupled to a power supply line through which a high-frequency current flows, extracts a dielectric electromotive force from the high-frequency current, and supplies power to the load. And a base that holds the plurality of pickups at a predetermined gap.

A plurality of pickup has a pair of outer pickup located at both ends, and an inner pickup positioned between the pair of outer pickup, the outer and the pickup of the inner, thick along the length of the feed line And a coil wound around the core and configured to output the same voltage. Further, the pickup unit includes a pair of output terminals that are electrically connected to a load, and an outer pickup and an inner pickup coil are connected in parallel between the output terminals.

  The characteristic feature of the pickup unit of the present invention is that the thickness of the core of the outer pickup is set smaller than the thickness of the core of the inner pickup. Because of this feature, in the pickup unit of the present invention, the magnetic flux density at the cores of adjacent pickups is equalized, the output voltage of each pickup is equalized, and the power of a constant voltage is large by adding the power from each pickup. Can be supplied to the load.

Preferably, the ratio (T ₀ / T ₁ ) between the thickness (T ₀ ) of the outer pickup core and the thickness (T ₁ ) of the inner pickup core is such that the core of the outer pickup and the adjacent inner pickup are adjacent to each other. Set as a function of distance (D) between cores.

In this context, the ratio (T ₀ / T ₁ ) of the outer pickup core thickness (T ₀ ) to the inner pickup core thickness (T ₁ ) is adjacent to the outer pickup core. As the distance (D) between the inner pickup core and the core becomes smaller, it is preferable to set a larger value.

Further, a parallel connection circuit in which the coils of the plurality of pickups are connected in parallel is connected in series to a power conversion circuit between the coil terminals, and the power conversion circuit is a circuit that converts AC power into DC power. Is preferred.

  In a plurality of pickups arranged along the feeder line, by setting the thickness of the core of the outer pickup smaller than the thickness of the core of the inner pickup, the magnetic flux density at the core of the adjacent pickup is made uniform, Make the output voltage of the pickup equal. Thus, a non-contact power feeding apparatus having a pickup unit that can take out large electric power with a uniform output voltage from each pickup using a plurality of pickups is provided.

The perspective view which shows the non-contact electric power feeding system which uses the pick-up unit concerning one Embodiment of this invention. The perspective view which shows a pickup unit same as the above. Schematic which shows the positional relationship of a pickup unit same as the above and a feeder. Schematic which shows the electric circuit of a pickup unit same as the above. The partially omitted perspective view showing a pickup unit according to another embodiment of the present invention.

  A non-contact power feeding apparatus 100 according to an embodiment of the present invention includes a pickup unit 20 and a base 21.

  As shown in FIG. 1, the pickup unit 20 is used for inducing electric power by electromagnetic induction from a power supply line 12 through which a high-frequency current generated by the high-frequency power supply device 10 flows, and supplying current to a load 23.

  In addition to a constant voltage power source 22 that converts AC power taken out by the pickup unit 20 into a predetermined AC voltage or DC voltage and outputs the same, a load 23 to which an output from the constant voltage power source 22 is supplied is provided on the base 21. Is built-in.

  For example, a motor is used as the load 23, and the base 21 is moved along the rail 11 by the driving force of the motor. For this reason, the base 21 is provided with a moving mechanism for reciprocating the base 21 along the rail 11. The driving of the motor is controlled by an external controller, and the article suspended on the base 21 is moved along the rail 11.

  As shown in FIG. 2, the pickup unit 20 includes a plurality of pickup rows arranged in a line along the length direction of the feeder line 12, and a support 24 that holds the plurality of pickups with a predetermined gap (D). Consists of.

  The plurality of pickups includes a pair of outer pickups 30 positioned at both ends of the row and an inner pickup 40 positioned between the pair of outer pickups 30. The outer pickup 30 and the inner pickup 40 are composed of a core 51 formed of a magnetic material and a coil 52 wound around the core 51.

  As shown in FIG. 3, the core 51 is formed in a C shape, has an opening 53 in the center, a gap 54 between both ends, and has a thickness along the length direction of the feeder line 12.

  The outer pickup core 51 and the inner pickup core 51 are arranged along the thickness direction of each core so that the gap 54 is continuous, and the feeder 12 is accommodated in the internal opening 53 via the gap 54.

  The base 21 is coupled to the rail 11 so that the power supply line 12 is not in contact with each core 51 and each coil 52. That is, the entire pickup unit 20 is fixed to the base 21 so that the non-contact state with the feeder line 12 is maintained.

  As shown in FIG. 4, the coil 52 and the constant voltage power supply 22 are connected by a coil terminal 55, and the constant output voltage power supply 22 and the load 23 are connected by an output terminal 25.

  The coils 52 of the pickups are electrically connected in parallel with each other between the coil terminals 55 and are connected in series with the constant voltage power source 22 between the output terminals 25, so that the total power taken out by the pickups is passed through the output terminals 25. And output to the load 23.

  As shown in FIG. 2, each pickup 51 is supported by the support 24 so that the core 51 of each pickup (30, 40) leaves a predetermined gap (D) between the core 51 of each adjacent pickup. ing.

  In the above-described embodiment, the pickup unit in which two pickups are arranged on both sides of one inner pickup is illustrated. However, the present invention is not necessarily limited to this aspect, and is as shown in FIG. In addition, two outer pickups may be arranged on both sides of the plurality of inner pickups.

The core thickness (T ₀ ) of the outer pickup is smaller than the core thickness (T ₁ ) of the inner pickup.

The ratio (T ₀ / T ₁ ) between the core thickness (T ₀ ) of the outer pickup and the core thickness (T ₁ ) of the inner pickup is the gap between the core 51 of the outer pickup and the core 51 of the inner pickup adjacent thereto. It is set as a function of (D).

This function indicates that the ratio (T ₀ / T ₁ ) of the core thickness (T ₀ ) of the outer pickup to the core thickness (T ₁ ) of the inner pickup is between the outer pickup core and the adjacent inner pickup core. The gap (D) is set to increase as the gap (D) decreases.

The most preferable ratio for extracting the same voltage from each pickup is the gap between adjacent cores (D): outer pickup thickness 31 (T ₀ ): inner pickup thickness 41 (T ₁ ) = 10: 9: 11.

  Thus, by making the core thickness of the outer pickup smaller than the core thickness of the inner pickup, the interaction of the leakage magnetic flux output from the coil 52 of each pickup is optimized, and the output voltage from each pickup is made equal. be able to.

  Specifically, the leakage magnetic flux from the inner pickup with a large core thickness moves to the outer pickup with a small core thickness, thereby increasing the feeding rate of the outer pickup, and as a result, the output voltage from the outer pickup and the inner pickup Can be made equal.

For example, when three pickups are used, the core thickness (T ₀ ) of the outer pickup and the core thickness (T ₁ ) of the inner pickup are T ₀ = 45 mm and T ₁ = 55 mm with respect to the pickup gap D = 50 mm. As a result, substantially equal voltages are output from each pickup.

  On the other hand, if the pickup gap D is 50 mm and the core thickness of the three pickups is equal to T = 50 mm, the voltage of 210 V is output from the outer pickup and the voltage of 181 V is output from the inner pickup. It can be seen that there is a difference in the output voltage from each pickup.

  The C-shaped core 51 in the present invention means at least a core having a C-shaped portion, and for example, is applied to an E-shaped core including a C-shaped part.

12 feed line 20 pickup unit 21 base plate 23 load 24 support 25 output terminal 30 outside the pickup 40 inward pickup 51 core 52 coil 100 non-contact power feeding device (D) a gap _(T 0) core thickness of the outer pickup _(T 1) inside Pickup core thickness

Claims (4)

Is inductively coupled to the feed line a high-frequency current flows, a non-contact power feeding device supplies electric power to a load from the high-frequency current is taken out induction electromotive force,
The non-contact power feeding device is composed of a pickup unit and a base,
The pickup unit includes at least a plurality of pickups arranged along the length direction of the feeder line, a support body that holds the plurality of pickups with a predetermined gap, and a coil terminal that is electrically connected to a load.
The plurality of pickups, a pair of outer pickup located at both ends, is constituted by the inner pickup positioned between the pair of outer pickup,
The plurality of pickups include a core having a thickness along the length direction of the feeder line and a coil wound around the core, and are configured to output substantially the same voltage,
The outer and inner pickup coils are electrically connected in parallel between the coil terminals,
The non-contact power feeding apparatus according to claim 1, wherein a core thickness of the outer pickup is set smaller than a core thickness of the inner pickup. The ratio (T ₀ / T ₁ ) between the core thickness (T ₀ ) of the outer pickup and the core thickness (T ₁ ) of the inner pickup is the gap (D between the core of the outer pickup and the core of the inner pickup adjacent thereto (D The non-contact power feeding device according to claim 1, which is set as a function of The ratio (T ₀ / T ₁ ) between the core thickness (T ₀ ) of the outer pickup and the core thickness (T ₁ ) of the inner pickup is defined as the gap between the core of the outer pickup and the core of the inner pickup adjacent thereto (D The contactless power feeding device according to claim 1, wherein the contactless power supply device increases as the value decreases. A parallel connection circuit in which the coils of the plurality of pickups are connected in parallel is connected in series to a power conversion circuit between the coil terminals, and the power conversion circuit is a circuit that converts AC power into DC power. The contactless power supply device according to claim 1.