Apparatus and method for delivering power to a contactless portable data device
AssigneeMotorola, Inc.
InventorsStephen Leigh Kuffner, Scott Nelson Carney, Thomas Glenn Hall
Life of this patent
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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.
Claims22
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.
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 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%.
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 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.
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:
- 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.
In a data transmission terminal, a method of powering a contactless 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;
- 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.
In a data transmission terminal, a method of powering a contactless 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 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%.
In a data transmission terminal, a method of powering a contactless 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 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.
Dependencies are inferred from the claim text.