Device for transmitting data or energy
First Claim
1. A device for transmitting data or energy supply from or to a transponder, comprising:
- a stationary transceiver including a first oscillating circuit having an antenna in the form of a first coil, a first capacitor, and a resonant frequency determined by said antenna and said first capacitor;
a portable transponder including a second oscillating circuit having a second coil and a second capacitor;
an exciter unit oscillating at an oscillator frequency and supplying an output variable used as an exciter variable with an exciter frequency for compelling an oscillation of said first oscillating circuit; and
an evaluation unit for measuring at least one of current and voltage in said first oscillating circuit, said evaluation unit generating a correction value upon a deviation of the current or the voltage from a desired value and then correcting said first oscillating circuit upon all transmissions between said transceiver and said transponder for causing the most effective possible transmission between said transceiver and said transponder to take place.
1 Assignment
0 Petitions
Accused Products
Abstract
A device for transmitting data or energy supply from or to a transponder, especially for an anti-theft system in a motor vehicle, includes an antenna oscillating circuit which is induced to oscillate by an exciter variable. The oscillation is transmitted by transformer coupling to a transponder oscillating circuit. In order to make the transmission of energy or data as effective as possible, the current or the voltage in the antenna oscillating circuit is measured and compared with a desired variable. Upon a deviation, a correction value is generated by which the exciter current is increased or the resonant frequency is adapted to the exciter frequency as a consequence of the addition of an impedance to the antenna oscillating circuit.
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Citations
8 Claims
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1. A device for transmitting data or energy supply from or to a transponder, comprising:
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a stationary transceiver including a first oscillating circuit having an antenna in the form of a first coil, a first capacitor, and a resonant frequency determined by said antenna and said first capacitor; a portable transponder including a second oscillating circuit having a second coil and a second capacitor; an exciter unit oscillating at an oscillator frequency and supplying an output variable used as an exciter variable with an exciter frequency for compelling an oscillation of said first oscillating circuit; and an evaluation unit for measuring at least one of current and voltage in said first oscillating circuit, said evaluation unit generating a correction value upon a deviation of the current or the voltage from a desired value and then correcting said first oscillating circuit upon all transmissions between said transceiver and said transponder for causing the most effective possible transmission between said transceiver and said transponder to take place. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification