Means for non-contacting signal and energy transmission

• US 4,697,183 A
• Filed: 12/19/1985
• Issued: 09/29/1987
• Est. Priority Date: 12/21/1984
• Status: Expired due to Term

• Current Assignee: Angewandte Digital Elektronik GmbH
• Original Assignee: Angewandte Digital Electronik GmbH
• Inventors: Jenning, Michael, Mackenthun, Holger
• Primary Examiner(s): Caldwell, Sr., John W.
• Assistant Examiner(s): FATAHI YAR, MAHMOUD
• Application Number:
  US06/810,558
• Time in Patent Office: 649 Days
• Field of Search: 340/870.25, 340/870.31, 340/870.32, 340/870.34, 318/605, 318/608, 318/654, 318/655, 318/661, 318/690, 318/692, 324/226, 324/233, 324/239, 324/243
• US Class Current: 340/870.25
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• 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: H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: H04L 27/2331 wherein the received signal is demodulated using one or more delayed versions of itself
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence

Abstract

A noncontacting signal and energy transmission device includes a stationary microstation and a moveable microunit, wherein data is transmitted between the microstation and the microunit simultaneously by phase shifted signals and by synchronously switched signals, which also supply power to the microunit.

Claims

1. A device for contact-free signal and energy transmission having a stationary part and a movable part, comprising:

an oscillator in the stationary part to generate a periodic signal of a fixed frequency;

means for producing first and second coherent signals having a phase shift of approximately 90 degrees with respect to one another from said fixed frequency periodic signal;

first and second branches connected to said coherent signal producing means to transmit respective ones of said first and second signals;

a circuit means connected to said first branch to selectively impart approximately 180 degree phase shifts on said first signal corresponding to a signal to be transmitted;

first and second coils connected to respective ones of said first and second branches to transmit said respective first and second signals;

third and fourth coils disposed at said movable part for signal transmission and reception by inductive coupling with said first and second coils, said third and fourth coils being selectively inductively coupled to respective ones of said first and second coils and alternately to respective ones of said second and first coils so that transmission of said signal to be transmitted occurs from said stationary part to said movable part by inductive coupling of said coils; and

a phase evaluation connected at said movable part for documenting said phase shifts for signal transmission to said movable part.

2. A device as claimed in claim 1, wherein said first and second coherent signal producing means includes a pair of complimentary flip-flops connected to an output of said oscillator, one of said flip-flops responding to positive-going portions of said periodic signal and another of said flip-flops responding to negative-going portions of said periodic signal so that output signals of said one and another flip-flop are of the same frequency but are shifted in phase relative to one another.

3. A device as claimed in claim 1, further comprising:

a first active circuit element connected in said first branch between said 180 degree phase shift means and said first coil to amplify said first signal; and

a second active circuit element connected in said second branch to amplify second signal.

4. A device as claimed in claim 3, wherein said first and second active circuit elements are transistors.

5. A device as claimed in claim 1, further comprising:

an interface in said movable part connected to said third and fourth coils to receive inductively coupled first and second signals for detecting said signal to be transmitted; and

a microcomputer in said movable part connected to said interface to receive said signal to be transmitted.

6. A device as claimed in claim 5, wherein said interface includes:

a first rectifier connected to said fourth coil;

a second rectifier connected to said third coil;

a voltage regulator connected to said first and second rectifiers and having a power supply output connected to said microcomputer to supply power from signals inductively coupled to said third and fourth coils simultaneously with transmission of said signal to be transmitted.

7. A device as claimed in claim 5, further comprising:

a third flip-flop connected to said third and fourth coils to detect phase shifts in a signal inductively coupled to at least one of said third and fourth coils.

8. A device as claimed in claim 7, further comprising:

level defining means for transmitting data to said microcomputer, said level defining means including;

a fourth flip-flop connected to an output of said third flip-flop and to a reset lead from said microcomputer, and

at least one logic gate connected to outputs of said third and fourth flip-flop.

12. A device as claimed in claim 1, further comprising:

means in said movable part for synchronous switching to transmit data from said movable part to said stationary part by inductive coupling simultaneously with the transmission of said phase shifted signal to be transmitted.

9. A device for non-contacting energy and signal transmission between a microstation and a microcomputer controlled microunit, comprising:

a microstation including;

means for generating first and second coherent periodic signals, said first signal being phase shifted by approximately 90 degrees with respect to said second signal;

means for selectively imparting an approximately 180 degree phase shift on one of said first and second signals;

first and second inductive couplers connected to said first and second signal generating means to transmit respective ones of said first and second signals;

a microunit including;

third and fourth inductive couplers mounted for selective coupling said first and second inductive couplers, said third coupler being couplable to said first coupler and said fourth coupler being couplable to said second coupler when said microunit and said microstation are in a first relative position and said third coupler being couplable to said second coupler and said fourth coupler being couplable to said first coupler when said microunit and said microstation are in a second relative position;

an interface connected between said third and fourth coils and said microcomputer, said interface including;

means for phase evaluation of signals at said third and fourth coils,

means for level definition of signals from said phase evaluation means,

means for rectifying signals from said third and fourth coils, and

means for regulating said rectified signal to supply power to said microcomputer;

whereby signal transmission from said microstation to said microunit ensues by said selective phase shifts.

10. A device as claimed in claim 9, wherein said interface includes means for transmitting data from said microcomputer to said microstation, and further comprising means in said microstation for detecting said data.

11. A device as claimed in claim 10, wherein said data transmitting means includes means for selectively loading one of said third and fourth coils and said data detecting means includes means for detecting signal amplitude variations in at least one of said first and second coils.