Apparatus and method for wireless data and energy transmission

• US 5,515,399 A
• Filed: 03/24/1994
• Issued: 05/07/1996
• Est. Priority Date: 03/24/1993
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Swart, Marten
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): VO, DON NGUYEN
• Application Number:
  US08/217,584
• Time in Patent Office: 775 Days
• Field of Search: 375/257, 375/258, 375/219, 455/41, 333/177, 363/21, 379/55
• US Class Current: 375/258
• CPC Class Codes: B60R 16/027 between relatively movable parts of the vehicle, e.g. between steering wheel and column devices for measuring, signalling or controlling tyre pressure or temperature specially adapted for mounting on vehicles B60C23/00
• CPC Class Codes: G08C 17/04 using magnetically coupled devices
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 38/18 Rotary transformers

Abstract

An apparatus for the wireless transmission of energy and data includes a transformer with two sides for transmitting energy in one direction and data in both directions. A circuit on both of the sides of the transformer controls and evaluates a course of the transmission. In a method for controlling and evaluating the apparatus, a primary-side switching path is interrupted for transmitting energy from the primary side to the secondary side. Data are transmitted from the primary side to the secondary side during an energy storage phase by briefly interrupting a primary-side switching path. Data are transmitted from the secondary side to the primary side in a period during an energy storage phase by a secondary-side load pulse. An information transmission is controlled with a trigger and evaluation device on the primary side and on the secondary side. The information both on the primary side and on the secondary side is evaluated in the trigger and evaluation device each communicating with a respective processor.

Claims

1. An apparatus for the wireless transmission of energy and data, comprising:

a transformer for transmitting energy in one direction and data in both directions, said transformer having a primary-side winding and a secondary-side winding with winding terminals;

circuit means connected to each of said windings of said transformer for controlling and evaluating a course of the transmission;

a diode having an anode connected to one of said winding terminals of said secondary-side winding;

a voltage regulator to which said diode is connected in the conducting direction;

a further diode having a cathode connected to the one winding terminal;

an additional diode having a cathode connected to the other of said winding terminals;

a resistor and a switching transistor connected between the other winding terminal and a secondary-side ground; and

trigger and evaluation means connected to said winding terminals and to said switching transistor for controlling said switching transistor.

2. The apparatus according to claim 1, wherein said primary-side and secondary-side windings of said transformer have mutually opposed directions of winding, and one of said windings is stationary in said transformer and the other of said windings is movable relative thereto.

3. The apparatus according to claim 2, wherein said stationary winding is connected to a steering column of a motor vehicle, and said moving winding is connected to a steering wheel of the motor vehicle.

4. The apparatus according to claim 1, wherein said primary winding of said transformer is associated with a chassis of the motor vehicle, and said secondary winding is associated with the steering wheel.

5. A method for controlling and evaluating an apparatus for the wireless transmission of energy and data having a transformer with primary and secondary sides and a primary-side switching path, which comprises:

connecting the primary-side switching path for storing energy at the primary side during an energy storage phase, and interrupting the primary-side switching path for transmitting energy from the primary side to the secondary side during an energy transfer phase;

transmitting data from the primary side to the secondary side during the energy storage phase by briefly interrupting the primary-side switching path;

transmitting data from the secondary side to the primary side in a period during the energy storage phase by a secondary-side load pulse;

controlling an information transmission with trigger and evaluation means on the primary side and on the secondary side; and

evaluating the information both on the primary side and on the secondary side in the trigger and evaluation means each communicating with a respective processor.

6. The method according to claim 5, which comprises developing a current pulse in the primary winding by transmitting the data from the secondary side to the primary side with the load pulse on the secondary side, and evaluating the current pulse in a comparator in the trigger and evaluation means.

7. The method according to claim 5, which comprises measuring, with the processor, a voltage at a voltage divider formed by resistors on the secondary side, transmitting the voltage as data information to the primary side, and regulating the voltage.

8. The method according to claim 6, which comprises controlling a load with a trigger and evaluation means on the secondary side for transmitting the data serially.

9. The method according to claim 8, which comprises adjusting a switching frequency to be the same on the primary side and on the secondary side, and transmitting the data in a range of approximately 125 kHz.

10. The method according to claim 5, which comprises adjusting the instants of voltage interruption on the primary side so as not coincide chronologically with the instant of the load pulse on the secondary side.

11. The method according to claim 10, which comprises adjusting the instants so as to occur in the same switching phase.

12. The method according to claim 5, which comprises transmitting the data only in every other period, for enlarging a control range of energy transmission.

13. The method according to claim 5, which comprises synchronizing the primary side with the secondary side for transmission of the data in at least one direction.

16. The method according to claim 13, which comprises utilizing a positive edge at an onset of the energy storage phase, for synchronization.

17. The method according to claim 13, which comprises utilizing one of two edges of a pulse created upon the primary-side interruption of the switching path, for synchronization.

18. The method according to claim 13, which comprises subdividing the data pulse into a synchronizing pulse and an information pulse.

14. In a method for controlling and evaluating an apparatus for the wireless transmission of energy and data having a transformer with primary and secondary sides and a primary-side switching path being interrupted for transmitting energy from the primary side to the secondary side, the improvement which comprises:

transmitting data from the primary side to the secondary side during an energy storage phase by briefly interrupting a primary-side switching path;

transmitting data from the secondary side to the primary side in a period during an energy storage phase by a secondary-side load pulse;

controlling an information transmission with trigger and evaluation means on the primary side and on the secondary side;

evaluating the information both on the primary side and on the secondary side in the trigger and evaluation means each communicating with a respective processor;

transmitting data from the primary side to the secondary side during the energy storage phase, by briefly interrupting the voltage pulse on the primary side resulting in a brief opposite-side phase voltage pulse at the secondary winding, and evaluating a resultant current as data information in a comparator in the secondary-side trigger and evaluation means.

15. The method according to claim 14, which comprises pre-defining the instant of interruption of the primary side, on the secondary side.