Noncontact power transmitting apparatus

• US 5,923,544 A
• Filed: 07/21/1997
• Issued: 07/13/1999
• Est. Priority Date: 07/26/1996
• Status: Expired due to Term

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Urano, Takashi
• Primary Examiner(s): Hecker, Stuart N.
• Application Number:
  US08/897,680
• Time in Patent Office: 722 Days
• Field of Search: 363/17, 363/22, 320/108, 340/870.31, 307/104
• US Class Current: 363/22
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02M 3/3382 in a push-pull circuit arrangement

Abstract

A noncontact power transmitting apparatus which makes it possible to rapidly charge a secondary cell of a part to be charged with large electric power and realize a lightweight and compact part to be charged. A power-transmitting coil of a charging part is divided into two sets, and the power-transmitting coils of the sets are respectively wound around cores, and are formed as a first power-transmitting coil portion 26 and a second power-transmitting coil portion 27 which are separate and independent as the two sets. Meanwhile, a power-receiving coil of a part to be charged is wound around a core, and is formed as a single power-receiving coil portion 28. In a chargeable state in which the part to be charged is placed on the charging part, the power-receiving coil portion 28 is inserted in a space between the first power-transmitting coil portion 26 and the second power-transmitting coil portion 27, and the first power-transmitting coil portion 26, the power-receiving coil portion 28, and the second power-transmitting coil portion 27 are arranged in such a manner as to be aligned with each other. Windings are wound such that the polarities of the windings are adjusted so that the directions of magnetic fluxes φ1 and φ2, which penetrate from the first power-transmitting coil portion 26 and the second power-transmitting coil portion 27 through the power-receiving coil portion 28, are constantly set in the same direction.

Claims

1. A noncontact power transmitting apparatus comprising:

a transmitting part including a high-frequency oscillating circuit having a parallel resonance circuit formed by a capacitor and a power-transmitting coil, said power-transmitting coil including a first power-transmitting coil portion and a second power-transmitting coil portion; and

a receiving part including a power-receiving coil portion for inducing a voltage by electromagnetically coupling with said power-transmitting coil of said high-frequency oscillating circuit;

in a power transmitting state in that said receiving part is magnetically coupled with the charging part, the power-receiving coil portion is inserted in a space between the first power-transmitting coil portion and the second power-transmitting coil portion, and the first power-transmitting coil portion, the power-receiving coil portion, and the second power-transmitting coil portion are arranged in such a manner that the power-receiving coil portion is located in the magnetic flux generated by the first and second power-transmitting coil portions.

2. A noncontact power transmitting apparatus as claimed in claim 1, wherein said first and second power-transmitting coil portions are respectively wound around cores, and said power-receiving coil portion is wound around a core.

3. A noncontact power transmitting apparatus as claimed in claim 1, wherein said first power-transmitting coil portion and said second power-transmitting coil portion are connected in one of series and parallel, and each of said first and second power-transmitting coil portions consists of two winding portions, said winding portions being wound such that polarities of the winding portions are adjusted so that directions of magnetic fluxes, which penetrate from the first power-transmitting coil portion and the second power-transmitting coil portion through the power-receiving coil portion, are constantly set in the same direction.

4. A noncontact power transmitting apparatus as claimed in claim 2, wherein said first power-transmitting coil portion and said second power-transmitting coil portion are connected in one of series and parallel, and each of said first and second power-transmitting coil portions consists of two winding portions, said winding portions being wound such that polarities of the winding portions are adjusted so that directions of magnetic fluxes, which penetrate from the first power-transmitting coil portion and the second power-transmitting coil portion through the power-receiving coil portion, are constantly set in the same direction.

5. A noncontact power transmitting apparatus as claimed in claim 3, wherein said high-frequency oscillating circuit comprises driving means for driving winding portions of the first power-transmitting coil portion and the second power-transmitting coil portion while alternately repeating a first timing at which one winding portion of the first power-transmitting coil portion and one winding portion of the second power-transmitting coil portion are energized simultaneously and other winding portions are not energized and a second timing at which another winding portion of the first power-transmitting coil portion and another winding portion of the second power-transmitting coil portion are energized simultaneously and the one winding portions are not energized.

6. A noncontact power transmitting apparatus as claimed in claim 4, wherein said high-frequency oscillating circuit comprises driving means for driving winding portions of the first power-transmitting coil portion and the second power-transmitting coil portion while alternately repeating a first timing at which one winding portion of the first power-transmitting coil portion and one winding portion of the second power-transmitting coil portion are energized simultaneously and other winding portions are not energized and a second timing at which another winding portion of the first power-transmitting coil portion and another winding portion of the second power-transmitting coil portion are energized simultaneously and the one winding portions are not energized.

7. A noncontact power transmitting apparatus as claimed in claim 1, wherein said first power-transmitting coil portion and said second power-transmitting coil portion are connected in one of series and parallel, and each of said first power-transmitting coil portion and second power-transmitting coil portion consist of one winding portion, and the winding portion being wound such that polarities of the winding portions are adjusted so that directions of magnetic fluxes, which penetrate from the first power-transmitting coil portion and the second power-transmitting coil portion through the power-receiving coil portion, are constantly set in the same direction.

8. A noncontact power transmitting apparatus as claimed in claim 2, wherein said first power-transmitting coil portion and said second power-transmitting coil portion are connected in one of series and parallel, and each of said first power-transmitting coil portion and second power-transmitting coil portion consist of one winding portion, and the winding portion being wound such that polarities of the winding portions are adjusted so that directions of magnetic fluxes, which penetrate from the first power-transmitting coil portion and the second power-transmitting coil portion through the power-receiving coil portion, are constantly set in the same direction.

9. A noncontact power transmitting apparatus as claimed in claim 1, wherein said transmitting part is a battery charger and said receiving part is a portable electronic apparatuses including a rechargeable battery.

10. A noncontact power transmitting apparatus as claimed in claim 2, wherein said transmitting part is a battery charger and said receiving part is a portable electronic apparatuses including a rechargeable battery.