Inductive light-up cards

Abstract

A sensor-activated light-emitting card includes: a first loop antenna module configured to generate an induced voltage by sensing a wireless signal; a first capacitor connected in parallel in the electrical path between a first terminal and a second terminal of the first loop antenna module; a communication module configured to exchange data with another communication module that generates the wireless signal; and a light-emitting module consisting of a first set of LEDs and a second set of LEDs. During the positive half-cycle of the induced voltage generated by the first loop antenna module, the first set of LEDs is illuminated, and during the negative half-cycle of the induced voltage generated by the first loop antenna module, the second set of LEDs is illuminated. This solves the problems of limited light-emitting effect and insufficient sensing distance in current sensor-activated smart cards.

Claims

1. A sensor-activated light-emitting card, comprising: A first loop antenna module having a first terminal and a second terminal, the first loop antenna module being configured to generate an induced voltage by sensing a wireless signal; a first capacitor connected in parallel in the electrical path between the first terminal and the second terminal of the first loop antenna module; a communication module having an input terminal and an output terminal, the input terminal being electrically connected to the first terminal of the first loop antenna module, the communication module being configured to perform a data exchange procedure with another communication module that generates the wireless signal; a light-emitting module comprising a first group of light-emitting LEDs and a second group of light-emitting LEDs, the first terminal of the first group of light-emitting LEDs being electrically connected to the output terminal of the communication module, the second terminal of the first group of light-emitting LEDs being electrically connected to the second terminal of the first loop antenna module, and the first terminal of the second group of light-emitting LEDs being electrically connected to the output terminal of the communication module and the first terminal of the first group of light-emitting LEDs, and the second terminal of the second group of light-emitting LEDs being electrically connected to the second terminal of the first loop antenna module; Specifically, during the positive half-cycle of the induced voltage generated by the first loop antenna module, the first set of LEDs is lit, and during the negative half-cycle of the induced voltage generated by the first loop antenna module, the second set of LEDs is lit.

2. The inductive light-emitting card as described in claim 1 further includes a second loop antenna module having a first end and a second end. The second loop antenna module is disposed inside the first loop antenna module and is surrounded by the first loop antenna module to form a coaxial magnetic flux superposition effect with the first loop antenna module to increase the sensing distance of the wireless signal. The first loop antenna module and the second loop antenna module are electrically isolated from each other.

3. The inductive light-emitting card as described in claim 2 further includes a second capacitor connected in parallel in the electrical path between the first end and the second end of the second loop antenna module, wherein the capacitance value of the second capacitor is less than or equal to 200pF.

4. The inductive light-emitting card as claimed in claim 1 further includes a second loop antenna module having a first end and a second end. The second loop antenna module is disposed outside the first loop antenna module and surrounds the first loop antenna module to form a coaxial magnetic flux superposition effect with the first loop antenna module to increase the sensing distance of the wireless signal. The first loop antenna module and the second loop antenna module are electrically isolated from each other.

5. The inductive light-emitting card as described in claim 4 further includes a second capacitor connected in parallel in the electrical path between the first end and the second end of the second loop antenna module, wherein the capacitance of the second capacitor is less than or equal to 200pF.

6. The inductive light-emitting card as claimed in claim 1 further includes a resistor connected in series in the electrical path between the first end and the second end of the first loop antenna module, the resistance value of the resistor being less than or equal to 5 ohms.

7. The inductive light-emitting card as described in claim 1 further includes an inductor connected in series in the electrical path between the first end and the second end of the first loop antenna module, wherein the inductance value of the inductor is less than or equal to 3 uH.

8. The inductive light-emitting card as claimed in claim 1, wherein the capacitance of the first capacitor is less than or equal to 200 pF.

9. The inductive light-emitting card as claimed in claim 1, wherein the first terminal of the first group of light-emitting LEDs is a negative terminal, the second terminal of the first group of light-emitting LEDs is a positive terminal, the first terminal of the second group of light-emitting LEDs is a positive terminal, and the second terminal of the second group of light-emitting LEDs is a negative terminal.

10. The inductive light-emitting card as claimed in claim 1, wherein the first group of light-emitting LEDs consists of two LEDs connected in series in the same direction, and the second group of light-emitting LEDs consists of two LEDs connected in series in opposite directions.

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