LOW-POWERED RFID TAG AND METHOD OF EXPANDING LIFECYCLE OF RFID TAG
First Claim
1. An RFID tag comprising:
- a general command decoder which decodes a signal received from an RFID tag reader to detect a general command;
a wake-up command decoder which decodes the signal to detect a wake-up command;
a main controller of which state is changed from an activated mode where the main controller activates the general command decoder and executes the general command to a standby mode where the main controller inactivates the general command decoder if the main controller does not receives the general command from the general command decoder within a predetermined time interval; and
a wake-up controller which changes the state of the main controller from the standby mode to the activated mode if a voltage of a continuous wave included in the signal is equal to or higher than a predetermined voltage or if the wake-up command matches with a predetermined activation code.
1 Assignment
0 Petitions
Accused Products
Abstract
A battery-powered RFID tag capable of reducing power consumption and a method of waking up the RFID tag are provided. The battery-powered RFID tag has an activated mode where a general command is detected by decoding a signal received from an RFID tag reader and the general command is executed and a standby mode where the general command is not detected. If a voltage of a continuous wave detected from the signal is equal to or higher than a predetermined voltage or if a wake-up command is detected from the signal, the state of the RFID tag is changed from the standby mode to the activated mode. In addition, the RFID tag is driven by a higher one between the voltage of the continuous wave and a voltage of a built-in battery.
-
Citations
19 Claims
-
1. An RFID tag comprising:
-
a general command decoder which decodes a signal received from an RFID tag reader to detect a general command; a wake-up command decoder which decodes the signal to detect a wake-up command; a main controller of which state is changed from an activated mode where the main controller activates the general command decoder and executes the general command to a standby mode where the main controller inactivates the general command decoder if the main controller does not receives the general command from the general command decoder within a predetermined time interval; and a wake-up controller which changes the state of the main controller from the standby mode to the activated mode if a voltage of a continuous wave included in the signal is equal to or higher than a predetermined voltage or if the wake-up command matches with a predetermined activation code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of waking up an RFID tag, comprising:
-
(a) detecting a general command by decoding a signal received from an RFID tag reader; (b) detecting a wake-up command by decoding the signal; (c) changing an activated mode where the general command decoder is activated and the general command is executed to a standby mode where the general command decoder is inactivated if the general command is not received from the general command decoder within a predetermined time interval; (d) changing a state of a main controller from the standby mode to the activated mode if a voltage of a continuous wave obtained by rectifying and boosting the signal is equal to or higher than a predetermined voltage or if the wake-up command matches with a predetermined activation code. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. An RFID tag comprising:
-
a built-in battery; a voltage multiplier which rectifies and boosts a signal received from an RFID tag reader to output a voltage of a detected continuous wave; and a switching circuit which applies a higher one between the voltage of the continuous wave and a voltage of the battery to internal components of the RFID tag.
-
-
19. A method of supplying power to an RFID tag, comprising:
-
rectifying and boosting a signal received from an RFID tag reader to output a DC voltage; and applying a higher one between the DC voltage and a voltage of a built-in battery to internal components of the RFID tag.
-
Specification