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Power transmission transformer for noncontact power transfer device

a technology of power transmission transformer and non-contact power transfer, which is applied in the direction of transformers/inductance coils/windings/connections, transformers, transformers/inductance coils/windings/connections, etc., can solve the problems of low reliability and inapplicability of methods, and achieve the effect of improving the workability of implementation, facilitating implementation on the circuit substrate, and improving the reliability of connection

Inactive Publication Date: 2008-10-16
TOKO KABUSHIKI KAISHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]Because the power transmission transformer for a noncontact power transfer device is configured by using the bobbin, coupling between the transmitting coil and the drive coil can be enhanced by setting a collar thickness of the bobbin to a predetermined thickness, and the winding number of the drive coil can be reduced.
[0020]Further, the mating portion of the first bobbin may be directly mounted on the circuit substrate, and fitting the first bobbin and the second bobbin together may facilitate implementation on the circuit substrate.
[0021]As described above, the power transmission transformer for a noncontact power transfer device of the present invention can be improved in workability in implementing and reliability of connection by using the first bobbin and the second bobbin.

Problems solved by technology

However, the method is not practical because of poor workability in connecting ends of winding wire, and the like, and low reliability of connection.

Method used

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  • Power transmission transformer for noncontact power transfer device
  • Power transmission transformer for noncontact power transfer device
  • Power transmission transformer for noncontact power transfer device

Examples

Experimental program
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Effect test

first embodiment

[0035]Referring to FIG. 1 illustrating a representative example of a power transmission transformer for a noncontact power transfer device according to the present invention, the power transmission transformer includes a transmitting coil L1, a drive coil L2, a first bobbin 1, and a collar 2.

[0036]As shown in FIG. 1, the first bobbin 1 is formed of synthetic resin having thermal resistance and insulating properties, and includes: a collar 2 which is approximately quadrangular and includes a cylindrical tubular portion having a predetermined thickness provided thereto; and a winder spindle 1a and a winder spindle 1b on both surfaces of the collar 2 opposed to each other; and further a mating portion 3 for fixing, extending to an end portion of the winder spindle 1b (on the bottom surface side). Then, a plurality of slits 4 made from an edge of the collar 2 to near the winder spindle is provided.

[0037]The second bobbin 5 is formed of flat and approximately quadrangular, synthetic resi...

second embodiment

[0043]As a second embodiment, a power transmission transformer will be described when a mating hole or the like cannot be provided in the surface of the external substrate.

[0044]FIG. 2 shows the assembling of a power transmission transformer T2. In FIG. 2, FIG. 2A is an elevation view of the power transmission transformer T2, and FIG. 2B is an elevation view of a second bobbin, and FIG. 2C is a plan view of the second bobbin.

[0045]As shown in FIG. 2, the power transmission transformer T2 includes a second bobbin 5 having a plurality of external terminals in addition to the power transmission transformer T1 of the first embodiment.

[0046]In the second embodiment, the mating portion 3 provided in the first bobbin of the power transmission transformer T1 in the first embodiment is fitted in the mating hole 6 provided in the second bobbin to be fixed. In addition, when bad fit or the like may be feared at the time of fitting, it may be desirable to fix together with an adhesive agent or ...

third embodiment

[0050]As a third embodiment, a power transmission transformer T3 will be described that is most suitable when the drive coil L2 has a comparatively large winding number, and the coil has a degree of freedom of winding.

[0051]In FIG. 3, FIG. 3A is a plan view of the power transmission transformer T3 and FIG. 3B is an elevation view thereof.

[0052]FIG. 4 shows the assembling of the first bobbin and the second bobbin. FIG. 4A shows the first bobbin, and FIG. 4B shows the second bobbin, and FIG. 4C shows that the first bobbin and the second bobbin are fitted together.

[0053]As shown in FIG. 4, the power transmission transformer T3 is shown in FIG. 4C illustrating that the mating portions of the first bobbin (FIG. 4A) and the second bobbin (FIG. 4B) described in the first and second embodiments are beforehand fitted together.

[0054]In the power transmission transformer T3, as shown in FIG. 3, first, the drive coil L2 is formed by winding urethane-coated electrical conductor around the winder...

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Abstract

The present invention provides a power transmission transformer of which workability in implementing and reliability of connection are considered in a noncontact power transfer device using individual self-oscillation circuits. The power transmission transformer for a noncontact power transfer device including a transmitting coil L1 and a drive coil L2 for self-oscillation on a power transmission device side includes a bobbin in which the transmitting coil and the drive coil L2 are disposed, in which the transmitting coil and the drive coil L2 are configured by an air-core coil using self-bonding wire, and the bobbin 1 includes a winder spindle 1a, 1b on both surfaces opposed to each other across a collar 2 formed of a flat plate, and a mating portion 3 for mating with an external portion in an end portion of the winder spindle 1b, and the drive coil L2 is mounted on the winder spindle 1b and the transmitting coil L1 is mounted on the other, opposed winder spindle 1a across the collar.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a power transmission transformer for a noncontact power transfer device, and especially to a power transmission transformer for transferring electric power to a rechargeable battery used as a power supply for a cordless phone, a portable device and the like, the electric power being transferred in a noncontact state without through a metal contact from a power transmission device to a power receiving device by electromagnetic induction.[0003]2. Related Art[0004]FIG. 8 shows a noncontact power transfer device using a self-oscillation circuit in a power transmission portion as a circuit scheme which has a simplified configuration and low power consumption.[0005]In FIG. 8, a power transmission side 10 which is a power transmission device includes a power transmission transformer T composed of a transmitting coil L1 and a drive coil L2 for self-oscillation, and a switching element Q1 in a po...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01F27/28H01F38/14
CPCH01F5/02H01F17/0006H01F17/02H01F27/027H01F27/306H01F27/38H01F38/14H01F2005/043H02J5/005H02J50/12H02J50/10
Inventor KOJIMA, HIDEKI
Owner TOKO KABUSHIKI KAISHA
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