Power supply unit

• US 6,075,433 A
• Filed: 03/12/1999
• Issued: 06/13/2000
• Est. Priority Date: 05/29/1995
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakai, Yoshiyuki, Ono, Makoto, Taniguchi, Satoru, Okura, Hideki
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): MAI, ANH T
• Application Number:
  US08/952,118
• Time in Patent Office: 459 Days
• Field of Search: 336/212, 336/DIG. 2, 336/170, 320/108
• US Class Current: 336/212
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: Y10S 336/02 Separable

Abstract

The present invention relates to a non-contact type power supply unit intended for use in electronic equipment, aiming at the realization of a small size and low cost and successful achievement in an enhanced capability of electric power transmission. In order to achieve the foregoing objectives, the non-contact type power supply unit comprises a primary coil(11) that is fed with pulsated currents, a secondary coil(13) mounted opposite to the primary coil(11) in an enclosure that is different from an enclosure wherein the primary coil(11) is mounted, whereby electric power is transferred from the primary coil(11) to the secondary coil(13) and wherein a ferrite core(12) is disposed so as to extend from the primary coil(11) towards the secondary coil(13), thus achieving efficient electric power transmission from the primary coil(11) to secondary coil(13).

Claims

1. A non-contact power supply unit having a primary coil to be fed with high frequency currents;

and a secondary coil mounted opposite to said primary coil in an enclosure that is different from an enclosure wherein said primary coil is mounted, whereby electric power is transferred from said primary coil to said secondary coil;

a ferrite core extending from said primary coil to said secondary coil, and a tertiary coil provided on said ferrite core at a place where said ferrite core is not surrounded by said primary coil.

2. The power supply unit according to claim 1, wherein a capacitor is connected across both ends of said tertiary coil.

3. A non-contact power supply unit comprising:

a primary coil to be fed with high frequency currents; and

a secondary coil mounted opposite to said primary coil in an enclosure that is different from an enclosure wherein said primary coil is mounted, whereby electric power is transferred from said primary coil to said secondary coil and wherein opposing surfaces of said primary coil and secondary coil are made flat, an I shape primary core is provided in the center of said primary coil and an E shape secondary core is provided in said secondary coil.

4. A non-contact power supply unit comprising:

a primary coil to be fed with high frequency currents; and

a secondary coil mounted opposite to said primary coil in an enclosure that is different from an enclosure wherein said primary coil is mounted, whereby electric power is transferred from said primary coil to said secondary coil and wherein said primary coil is wound around an I shape core and said secondary coil employs a coil or a printed wiring board with coil patterns formed thereon around a protruded part of said T shape core.