Secondary circuit device for wireless transmit-receive system and induction coil for wireless transmit-receive system

• US 5,831,348 A
• Filed: 11/22/1996
• Issued: 11/03/1998
• Est. Priority Date: 06/03/1996
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nishizawa, Yuji
• Primary Examiner(s): Elms, Richard T.
• Application Number:
  US08/755,347
• Time in Patent Office: 711 Days
• Field of Search: 307/17, 307/104, 336/DIG. 2, 336/120, 340/310.07, 340/310.01, 439/950, 343/856, 343/788, 455/41
• US Class Current: 307/104
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil

Abstract

In the secondary circuit device for wireless transmit-receive system according to the present invention, a first power resonance capacitor and a second power resonance capacitor are connected in parallel to a power induction coil, and also there is provided a resonance capacitor select switch which selectively closes either one of the first power resonance capacitor and the second power resonance capacitor according to the transmitting mode or receiving mode.

Claims

1. A secondary circuit device for a wireless transmit-receive system having a transmitting mode and a receiving mode, to which electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form comprising:

a power induction coil;

a first power resonance capacitor and a second power resonance capacitor each connected in parallel to said power induction coil;

a signal induction coil connected to said power induction coil through mutual inductance;

a resonance capacitor for transmitting connected in series to said signal induction coil;

a resonance capacitor for receiving connected in parallel to said signal induction coil;

a signal transmit-receive select switch which selectively elects either one of said resonance capacitor for transmitting and said resonance capacitor for receiving according to the transmitting mode or the receiving mode of the transmit-receive system; and

a resonance capacitor select switch which selectively elects either one of said first power resonance capacitor and said second power resonance capacitor according to the transmitting mode or the receiving mode of the transmit-receive system.

2. A secondary circuit device for a wireless transmit-receive system, to which an electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form comprising:

a power induction coil;

a variable capacity capacitor connected in parallel to said power induction coil;

a signal induction coil connected to said power induction coil through mutual inductance;

a resonance capacitor for transmitting connected in series to said signal induction coil;

a resonance capacitor for receiving connected in parallel to said signal induction coil;

a signal transmit-receive select switch which selectively closes either one of said resonance capacitor for transmitting and said resonance capacitor for receiving according to the transmitting mode or receiving mode; and

a control means for changing capacity of said variable capacity capacitor according to the transmitting mode or receiving mode.

3. A secondary circuit device for a wireless transmit-receive system having a transmitting mode and a receiving mode, to which electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form comprising:

a power induction coil with a tap having an intermediate tap;

a power resonance capacitor connected in parallel to said power induction coil with a tap;

a signal induction coil connected to said power induction coil through mutual inductance;

a resonance capacitor for transmitting connected in series to said signal induction coil;

a resonance capacitor for receiving connected in parallels to said signal induction coil;

a signal transmit-receive select switch which selectively elects either one of said resonance capacitor for transmitting and said resonance capacitor for receiving according to the transmitting mode or the receiving mode of the transmit-receive system; and

an inductance select switch which selectively elects either one of an edge section or an intermediate tap of said power induction coil with a tap according to the transmitting mode or the receiving mode of the transmit-receive system.

4. A secondary circuit device for a wireless transmit-receive system having a transmitting mode and a receiving mode, to which electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form comprising:

a power induction coil;

a power resonance capacitor connected in parallel to said power induction coil;

a signal induction coil connected to said power induction coil through mutual inductance;

a resonance capacitor for transmitting connected in series to said signal induction coil;

a resonance capacitor for receiving connected in parallel to said signal induction coil;

a signal transmit-receive select switch which selectively elects either one of said resonance capacitor for transmitting and said resonance capacitor for receiving according to the transmitting mode and the receiving mode of the transmit-receive system; and

a high impedance element connected in series between said signal induction coil and said resonance capacitor for transmitting.

5. A secondary circuit device for a wireless transmit-receive system according to claim 4;

wherein said high impedance element comprises a power impedance coil.

6. A secondary circuit device for a wireless transmit-receive system having a transmitting mode and a receiving mode, to which electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form comprising:

a power induction coil;

a power resonance capacitor connected in parallel to said power induction coil;

a signal induction coil connected to said power induction coil through mutual inductance;

a resonance capacitor for transmitting connected in series to said signal induction coil;

a resonance capacitor for receiving connected in parallel to said signal induction coil;

a signal transmit-receive a select switch which selectively elects either one of said resonance capacitor for transmitting and said resonance capacitor for receiving according to the transmitting mode or the receiving mode of the transmit-receive system;

a rectifying circuit connected to an output of a parallel resonance circuit for power induction comprising said power induction coil and said power resonance capacitor;

a first impedance matching capacitor and a second impedance matching capacitor each connected in series between said power induction coil and said rectifying circuit; and

an impedance matching capacitor select switch which selectively elects either one of said first impedance matching capacitor and said second impedance matching capacitor according to the transmitting mode or the receiving mode of the transmit-receive system.

7. A secondary circuit device for a wireless transmit-receive system, to which an electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form;

wherein power induction coils are provided in both sides of a signal induction coil respectively and a power resonance capacitor is connected in parallel to a circuit formed by connecting the two power induction coils in series.

8. A secondary circuit device for a wireless transmit-receive system according to claim 7;

wherein said signal induction coil and said power induction coil comprise a conductor loop pattern formed on a printed board respectively.

9. A secondary circuit device for a wireless transmit-receive system, to which an electric power and a signal are transmitted from a primary circuit device through mutual induction in a non-contact form;

wherein power induction coils are provided on both sides of a signal induction coil and a power resonance capacitor and a rectifying circuit are connected in parallel to each of the two power induction coils.

10. A secondary circuit device for a wireless transmit-receive system according to claim 9;

wherein said signal induction coil and said power induction coil comprise a conductor loop pattern formed on a printed board respectively.

11. An induction coil for a wireless transmit-receive system in which electric power and a signal are transmitted from a primary circuit device to a secondary circuit device through mutual inductance in a non-contact form;

wherein a conductor loop pattern is formed in each of n adjoining layers of a multi-layered printed board, each of said conductor loop patterns in each of said n adjoining layers being displaced by a specific gap from the conductor loop pattern formed on an adjacent adjoining layer, and one induction coil is formed by electrically connecting the conductor loop patterns on the n adjoining layers from the first layer up to the n-th layer.

12. An induction coil for a wireless transmit-receive system in which an electric power and a signal are transmitted from a primary circuit device to a secondary circuit device through mutual inductance in a non-contact form;

wherein a conductor loop pattern is formed by two loops in each of n adjoining layers of a multi-layered printed board, each of said conductor loop patterns in each of said n adjoining layers being displaced by a specific gap from the conductor loop pattern formed on an adjacent adjoining layer, and the conductor loop patterns formed on adjacent adjoining layers are electrically connected to each other from the first layer up to the n-th layer and from the n-th layer up to the first layer to form an induction coil.

13. An induction coil for a wireless transmit-receive system in which an electric power and a signal are transmitted from a primary circuit device to a secondary circuit device through mutual inductance in a non-contact form having a plurality sheets of printed boards, in each of which a conductor loop pattern is formed by patterning and a starting edge of the conductor loop pattern and a terminating edge thereof are formed at the same position of the top and rear surfaces of the board;

wherein the printed boards are overlaid with an insulating plate therebetween, and a terminating edge of a conductor loop pattern on one printed board is electrically connected, with a connection fitting engaged and attached to the insulating plate, to a starting edge of a conductor loop pattern formed on another printed board adjoining the former layer with said insulating plate therebetween.