Apparatus for contactless data and energy transmission

• US 5,349,173 A
• Filed: 04/23/1992
• Issued: 09/20/1994
• Est. Priority Date: 04/23/1991
• Status: Expired due to Term

• Current Assignee: Infineon Technologies AG
• Original Assignee: Siemens AG
• Inventors: Reiner, Robert, Scheckel, Bruno
• Primary Examiner(s): NELLI, RAYMOND A
• Application Number:
  US07/872,825
• Time in Patent Office: 880 Days
• Field of Search: 235/492, 235/449, 365/229
• US Class Current: 235/492
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil

Abstract

An apparatus for contactless data and energy transmission includes a stationary part having at least one coil for data and energy transmission, and an oscillator connected to the at least one coil for energy transmission. A movable part has at least one coil for data and energy transmission, at least one rectifier device connected downstream of the at least one coil, and at least one charge capacitor connected to the at least one rectifier device for carrying a pulsating operating voltage. One pair of the coils is used for energy transmission and one pair of the coils is used for data transmission. The coils of the movable part are arbitrarily associated with the coils of the stationary part. A device is disposed in the movable part for transmitting data from the movable part to the stationary part, by returning a portion of energy received through an applicable one of the coils of the movable part, modulated in accordance with a data signal, through another of the coils of the movable part.

Claims

1. An apparatus for contactless data and energy transmission, comprising:

a stationary part having at least one coil for data and energy transmission, and an oscillator connected to said at least one coil for energy transmission;

a movable part having at least one coil for data and energy transmission, at least one rectifier means connected downstream of said at least one coil, and at least one charge capacitor connected to said at least one rectifier means for carrying a pulsating operating voltage;

one pair of said coils being used for energy transmission and one pair of said coils being used for data transmission;

said coils of said movable part being interchangeably operable by a modulator to permit either of said coils of said moveable part to be utilized for one of data and energy transmission; and

means disposed in said movable part for transmitting data from said movable part to said stationary part, by returning a portion of energy received through an applicable one of said coils of said movable part, modulated in accordance with a data signal, through another of said coils of said movable part.

2. The apparatus according to claim 1, wherein said movable part includes at least one controllable semiconductor component having a load path interconnecting said coil for energy transmission and said coil for data transmission and having a control input receiving the data signal to be transmitted.

3. The apparatus according to claim 2, wherein said at least one controllable semiconductor component includes at least two controllable semiconductor components each being connected between a respective terminal of said coil for energy transmission and a respective terminal of said coil for data transmission.

4. The apparatus according to claim 2, including at least one resistor connected in series with the load path of said at least one controllable semiconductor component.

5. The apparatus according to claim 3, including at least two resistors each being connected in series with the load path of a respective one of said at least two controllable semiconductor components.

6. The apparatus according to claim 2, wherein the load path of said at least one semiconductor component has a high impedance.

7. The apparatus according to claim 3, wherein the load paths of said at least two semiconductor components have a high impedance.

8. The apparatus according to claim 1, including at least one modulator associated with said at least one coil in said movable part for delivering a rectified operating voltage being modulated with an energy signal blanked out of the data signal, to said at least one coil in said movable part for data transmission.

9. The apparatus according to claim 8, wherein said at least one rectifier means include:

two series-connected diodes having interconnected cathodes with a node point therebetween;

first and second MOS transistors having load paths connected in a series connection with a node point therebetween, said series connection of said MOS transistors being connected parallel to said series-connected diodes; and

said series connection of said MOS transistors having a first terminal connected to said first MOS transistor and a second terminal connected to said second MOS transistor, said first MOS transistor having a gate terminal connected to said second terminal and said second MOS transistor having a gate terminal connected to said first terminal;

the node points being connected to said at least one charge capacitor carrying the operating voltage; and

said at least one modulator includes;

an OR gate having a first input receiving the data signal, a second input receiving the energy signal decoupled from said energy transmission coil, and an output; and

an MOS transistor having a control input connected to the output of said OR gate and a load path connected parallel to one of said two diodes of said rectifier means.

10. The apparatus according to claim 1, wherein said at least one rectifier means has at least one output, and including an MOS transistor having a load path connected between said at least one charge capacitor and the at least one output of said at least one rectifier means.

11. The apparatus according to claim 8, wherein:

said at least one rectifier means has inputs and outputs; and

said at least one modulator includes;

four semiconductor switching elements having load paths and control terminals;

the load paths of two of said four semiconductor switching elements being connected in a first series circuit having a node point between said semiconductor switching elements and having terminals, and the load paths of the other two of said four semiconductor switching elements being connected in a second series circuit having a node point between said semiconductor switching elements and having terminals;

each of the node points of said series circuits being connected to a respective one of the inputs of said rectifier means;

resistors each being connected between a respective one of the outputs of said rectifier means and a respective one of the terminals of said series circuits;

a non-inverted control signal and an inverted control signal being delivered in alternation to the control terminals of said semiconductor switching elements of said first series circuit, the inverted control signal and the non-inverted control signal being delivered to the control terminals of said semiconductor switching elements of said second series circuit, and said coil for data transmission being acted upon in alternation with a positive and a negative voltage at said at least one charge capacitor.

12. The apparatus according to claim 6, wherein:

said at least one rectifier means has inputs and outputs; and

said at least one modulator includes;

four semiconductor switching elements having control terminals;

two of said four semiconductor switching elements being connected in a first series circuit having a node point between said two semiconductor switching elements and having terminals, and the other two of said four semiconductor switching elements being connected in a second series circuit having a node point between said other two semiconductor switching elements and having terminals;

two capacitors each being connected between a respective one of the node points of said series circuits and a respective one of the inputs of said rectifier means;

one of the terminals of each of said series circuits being connected to a respective one of the outputs of said rectifier means;

a non-inverted control signal and an inverted control signal being delivered in alternation to the control terminals of said semiconductor switching elements of said first series circuit, the inverted control signal and the non-inverted control signal being delivered to the control terminals of said semiconductor switching elements of said second series circuit, and said coil for data transmission being acted upon in alternation with a positive and a negative voltage at said at least one charge capacitor.

13. The apparatus according to claim 7, wherein:

said at least one rectifier means has inputs and outputs; and

said at least one modulator includes;

four semiconductor switching elements having control terminals;

two of said four semiconductor switching elements being connected in a first series circuit having a node point between said two semiconductor switching elements and having terminals, and the other two of said four semiconductor switching elements being connected in a second series circuit having a node point between said other two semiconductor switching elements and having terminals;

two capacitors each being connected between a respective one of the node points of said series circuits and a respective one of the inputs of said rectifier means;

one of the terminals of each of said series circuits being connected to a respective one of the outputs of said rectifier means;

a non-inverted control signal and an inverted control signal being delivered in alternation to the control terminals of said semiconductor switching elements of said first series circuit, the inverted control signal and the non-inverted control signal being delivered to the control terminals of said semiconductor switching elements of said second series circuit, and said coil for data transmission being acted upon in alternation with a positive and a negative voltage at said at least one charge capacitor.

14. The apparatus according to claim 6, wherein:

said at least one rectifier means first and second inputs and first and second outputs; and

said at least one modulator includes;

first and second reversing switched semiconductor switching elements having load paths and first and second reversing switch terminals;

capacitors each being connected between the first output of said rectifier means and the load path of a respective one of said semiconductor switching elements;

each of the first reversing switch terminals of said semiconductor switching elements being connected to the input of a respective one of said rectifier means, and the second reversing switch terminals of each of said semiconductor switching elements being connected to the second output of said rectifier means;

a third reversing switch semiconductor switching element having reversing terminals, a neutral middle position, and a load path;

the load path of said third semiconductor switching element being connected to the first output of said rectifier means; and

the reversing terminals of said third semiconductor switching element each being connected to a respective one of the inputs of said rectifier means.

15. The apparatus according to claim 7, wherein:

said at least one rectifier means first and second inputs and first and second outputs; and

said at least one modulator includes;

first and second reversing switched semiconductor switching elements having load paths and first and second reversing switch terminals;

capacitors each being connected between the first output of said rectifier means and the load path of a respective one of said semiconductor switching elements;

each of the first reversing switch terminals of said semiconductor switching elements being connected to the input of a respective one of said rectifier means, and the second reversing switch terminals of each of said semiconductor switching elements being connected to the second output of said rectifier means;

a third reversing switch semiconductor switching element having reversing terminals, a neutral middle position, and a load path;

the load path of said third semiconductor switching element being connected to the first output of said rectifier means; and

the reversing terminals of said third semiconductor switching element each being connected to a respective one of the inputs of said rectifier means.