An active card communication system and method based on working clock calibration

Abstract

The invention discloses an active card communication system and method based on working clock calibration. The active card communication system comprises card reading equipment and an active card, wherein the card reading equipment and the active card establish communication wirelessly. An equipment counter is arranged inside the card reading equipment in a built-in mode. A clock calibration module and a card counter are arranged in the active card in a built-in manner. The clock calibration module is used for determining whether a counting value of the equipment counter is equal to a counting value of the card counter after communication establishment between the card reading equipment and the active card; if so, a work clock calibration course is completed; and if not, the counting value of the equipment counter is written into the card counter and thus working clocks of the card reading equipment and the active card are synchronized and then the working clock calibration course is completed. Therefore, the communication success rate can be improved; the service life of the active card can be prolonged; and the active card can be maintained, upgraded, and recycled conveniently.

Description

technical field [0001] The invention relates to an active card communication system, in particular to an active card communication system and method based on working clock calibration. Background technique [0002] The active card is a wireless device powered by a battery. Its important technical requirement is low power consumption. In order to improve the service life, a sleep timer will be set in the active card to control the work and sleep of the active card through timing, so that Reduce power consumption. At present, most RFID active card clocks use an internal RC oscillator, which is affected by the accuracy of the RC oscillator and the error caused by the battery supply voltage, resulting in inaccurate timing of the internal sleep timer and a large clock deviation (generally within ± 20%), with the accumulation of timing counts, the clock deviation will become larger and larger, especially when the active card communicates with the card reading device, due to the c...

AI Technical Summary

Problems solved by technology

At present, most RFID active card clocks use an internal RC oscillator, which is affected by the accuracy of the RC oscillator and the error caused by the battery supply voltage, resulting in inaccurate timing of the internal sleep timer and a large clock deviation (generally within ± 20%), with the accumulation of timing counts, the clock deviation will become larger and larger, especially when the active card communicates with the card reading device, due to the clock deviation, the timing of the active card and the timing of the card reading device cannot Synchronization, and then can not communicate, at this time the active card will be considered to have reached the end of life

It can be seen that the same batch of active cards with the same specifications has a large gap in service life, and it is difficult to meet the demand for high life. When there is a large deviation in the dormancy time of the card, some products of the same batch will end their life prematurely, causing great changes to product maintenance, upgrades, and recycling.

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