Radio frequency identification tag for transmitting temperature data and method therefor
First Claim
1. A radio frequency identification tag comprising:
- an antenna unit which receives an external magnetic wave to generate an induced current;
a driving voltage generating unit which converts the induced current into a constant voltage and outputs the constant voltage;
a state detecting unit which detects an operational state of the driving voltage generating unit;
a memory which stores temperature data corresponding to the detected operational state and identification data needed for identification; and
a controlling unit which reads out, from the memory, the temperature data dependent on the operational state detected by the state detecting unit and the identification data, and externally outputs the temperature data and identification data via the antenna unit.
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Accused Products
Abstract
A radio frequency identification tag, used in a radio frequency identification system, includes an antenna unit for receiving an external magnetic wave to generate an induced current; a driving voltage generating unit for converting the induced current into a constant voltage and outputting the constant voltage; and a state detecting unit for detecting information about a change in an operational state of the driving voltage generating unit. The tag further includes a memory for storing temperature data corresponding to the information about the change in the operational state and data needed for identification; and a controlling unit for reading out, from the memory, the temperature data dependent on the information about the change in the operational state detected by the state detecting unit and the identification data. The read temperature and identification data are transmitted via an antenna unit.
13 Citations
18 Claims
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1. A radio frequency identification tag comprising:
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an antenna unit which receives an external magnetic wave to generate an induced current;
a driving voltage generating unit which converts the induced current into a constant voltage and outputs the constant voltage;
a state detecting unit which detects an operational state of the driving voltage generating unit;
a memory which stores temperature data corresponding to the detected operational state and identification data needed for identification; and
a controlling unit which reads out, from the memory, the temperature data dependent on the operational state detected by the state detecting unit and the identification data, and externally outputs the temperature data and identification data via the antenna unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio frequency identification tag comprising:
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an antenna unit which receives an external magnetic wave to generate an induced current;
a driving voltage generating unit which converts the induced current into a constant voltage and outputs the constant voltage;
a temperature sensor which detects a temperature;
a state compensating unit which applies a bias signal to the driving voltage generating unit; and
a controlling unit which controls the state compensating unit to adjust a size of the bias signal depending on the temperature detected by the temperature sensor, and to apply an adjusted bias signal to the driving voltage generating unit. - View Dependent Claims (10, 11)
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12. A method for radio frequency identification in a radio frequency identification system, the method comprising:
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(a) receiving an external magnetic wave and generating an induced current based on the magnetic wave;
(b) converting the induced current into a constant voltage using a constant voltage circuit;
(c) detecting information about a change in an operational state of the constant voltage circuit;
(d) reading out, from a memory, temperature data dependent on the information about the change in the operational state and identification data needed for identification; and
(e) combining the temperature data and the identification data to generate a transmission signal. - View Dependent Claims (13, 14, 15, 16)
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17. A method for radio frequency identification in a radio frequency identification system, comprising:
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(a) receiving an external magnetic wave and generating an induced current based on the magnetic wave;
(b) converting the induced current into a constant voltage using a constant voltage circuit;
(c) measuring a temperature to obtain temperature data;
(d) applying a bias signal to the constant voltage circuit depending on the temperature data to adjust a size of the constant voltage output from the constant voltage circuit; and
(e) reading out data needed for identification from a memory and externally transmitting the identification data as a radio frequency signal. - View Dependent Claims (18)
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Specification