Apparatus and method for delivering power to a contactless portable data device
First Claim
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1. In a terminal device, a method of powering a portable data device comprising the steps of:
- transmitting to the portable data device, in a first mode of operation, a power signal at a first power level and a data signal using a first modulation format and a first bit rate;
transmitting to the portable data device, in a second mode of operation, a power signal at a second power level and a data signal using a second modulation format and a second bit rate;
determining a power requirement from the portable data device to change modes of operation from the first mode of operation to the second mode of operation; and
changing, responsive to the step of determining, between the first mode of operation and the second mode of operation,where the second power level does not equal the first power level.
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Abstract
A terminal device powers a portable data device by transmitting in two modes of operation. In a first mode of operation, the terminal transmits to the portable data device a power signal at a first level and a data signal using a first modulation format and a first bit rate. In a second mode of operation, the terminal transmits to the portable data terminal a power signal at a second level and a data signal using a second modulation format and a second bit rate. The terminal determines a requirement to change modes of operation, and changes modes in response to changing power requirements of the portable data device.
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Citations
22 Claims
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1. In a terminal device, a method of powering a portable data device comprising the steps of:
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transmitting to the portable data device, in a first mode of operation, a power signal at a first power level and a data signal using a first modulation format and a first bit rate; transmitting to the portable data device, in a second mode of operation, a power signal at a second power level and a data signal using a second modulation format and a second bit rate; determining a power requirement from the portable data device to change modes of operation from the first mode of operation to the second mode of operation; and changing, responsive to the step of determining, between the first mode of operation and the second mode of operation, where the second power level does not equal the first power level. - View Dependent Claims (2, 3, 6, 7, 8, 9, 10, 11)
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4. In a terminal device, a method of powering a portable data device comprising the steps of:
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transmitting to the portable data device, in a first mode of operation, a power signal at a first level and a data signal using a first modulation format and a first bit rate; transmitting to the portable data device, in a second mode of operation, a power signal at a second level and a data signal using a second modulation format and a second bit rate; determining a requirement to change modes of operation; and changing, responsive to the step of determining, between the first mode of operation and the second mode of operation, wherein the first modulation format comprises ASK modulation using a modulation index in the range of 8%-12%.
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5. In a terminal device, a method of powering a portable data device comprising the steps of:
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transmitting to the portable data device, in a first mode of operation, a power signal at a first level and a data signal using a first modulation format and a first bit rate; transmitting to the portable data device, in a second mode of operation, a power signal at a second level and a data signal using a second modulation format and a second bit rate; determining a requirement to change modes of operation; and changing, responsive to the step of determining, between the first mode of operation and the second mode of operation, wherein the first modulation format comprises ASK modulation using a 100% modulation index.
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12. In a portable data device that is in communication with a terminal device, a method of performing one of a plurality of power-requiring tasks, comprising the steps of:
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determining by the portable data device a power requirement of the portable data device for a first of the plurality of power-requiring tasks; and transmitting by the portable data device to the terminal device, responsive to the step of determining, a power requirement request to change between a first mode of operation at a first power level and a second mode of operation at a second power level, where the second power level does not equal the first power level. - View Dependent Claims (13, 14, 15, 16)
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17. In a data transmission terminal, a method of powering a contactless portable data device comprising the steps of:
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transmitting to the portable data device, in a first mode of operation, a power signal at a first power level and a data signal using a first modulation format; receiving a power requirement request from the portable data device for the data transmission terminal to change the transmitted power level by a specified amount; and transmitting to the portable data device, responsive to the step of receiving, a power signal at a second power level, wherein the second power level differs from the first power level by the specified amount. - View Dependent Claims (20, 21, 22)
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18. In a data transmission terminal, a method of powering a contactless portable data device comprising the steps of:
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transmitting to the portable data device, in a first mode of operation, a power signal at a first level and a data signal using a first modulation format; receiving a request from the portable data device to change the transmitted power level by a specified amount; and transmitting to the portable data device, responsive to the step of receiving, a power signal at a second level, wherein the second level is different from the first level by the specified amount, wherein the first modulation format comprises ASK modulation using a modulation index in the range of 8%-12%.
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19. In a data transmission terminal, a method of powering a contactless portable data device comprising the steps of:
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transmitting to the portable data device, in a first mode of operation, a power signal at a first level and a data signal using a first modulation format; receiving a request from the portable data device to change the transmitted power level by a specified amount; and transmitting to the portable data device, responsive to the step of receiving, a power signal at a second level, wherein the second level is different from the first level by the specified amount, wherein the first modulation format comprises ASK modulation using a 100% modulation index.
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Specification