JP2021144709A - Method and device for identifying radio frequency of low power consumption - Google Patents

Method and device for identifying radio frequency of low power consumption Download PDF

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JP2021144709A
JP2021144709A JP2021038125A JP2021038125A JP2021144709A JP 2021144709 A JP2021144709 A JP 2021144709A JP 2021038125 A JP2021038125 A JP 2021038125A JP 2021038125 A JP2021038125 A JP 2021038125A JP 2021144709 A JP2021144709 A JP 2021144709A
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radio frequency
power consumption
frequency identification
low power
threshold value
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JP7164227B2 (en
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羅立聲
Li Sheng Lo
李仙耀
Hsien-Yao Li
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Generalplus Technology Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

To provide a method and a device for identifying the radio frequency of low power consumption.SOLUTION: The method for identifying the radio frequency of lower power consumption of the present invention is applied to a radio frequency identification tag reader. The method for identifying the radio frequency of low power consumption includes: a step A of moving to a normal sleep mode; a step B of executing a wake-up sequence at each specific time and sending a detection signal (Probe Signal) from a coil; a step C of detecting the energy of the coil and determining whether the level of the energy is smaller than a threshold value; and a step D of going back to the step A if the level of the energy of the coil is larger than the threshold value.SELECTED DRAWING: Figure 3

Description

本発明は、無線周波数識別（ＲＦＩＤ）の分野に関し、更に詳しくは、低消費電力の無線周波数識別方法と装置（Ａ ｍｅｔｈｏｄ ｆｏｒ ｒａｄｉｏ ｆｒｅｑｕｅｎｃｙ ｉｄｅｎｔｉｆｉｃａｔｉｏｎ ｗｉｔｈ ｌｏｗ ｐｏｗｅｒ ｃｏｎｓｕｍｐｔｉｏｎ ａｎｄ ａ ｄｅｖｉｃｅ ｔｈｅｒｅｏｆ）に関する。 The present invention relates to the field of radio frequency identification (RFID), and more particularly to low power consumption radio frequency identification methods and devices (A method for radio frequency identification with information with rotation and device theor).

無線周波数識別（英語：Ｒａｄｉｏ Ｆｒｅｑｕｅｎｃｙ ＩＤｅｎｔｉｆｉｃａｔｉｏｎ、ＲＦＩＤ）は無線通信技術の一種であり、無線信号により特定の目標を識別すると共に関連データを読み書し、識別システムと特定の目標との間に機械的または光学的接触を構築する必要はない。無線信号は無線周波数に調整した電磁場であり、データを物品に装着しているタグからアップロードして送信し、前記物品を自動識別し追跡する。あるタグは識別時に識別装置から発射する電磁場中からエネルギーを取得するため、電池が不要である。タグ本体に電源を有し、無線電波を能動的に発射するものもある。タグは電子的に保存した情報を含み、数ｍの範囲内ならば識別可能である。バーコードとの違いは、無線周波数タグは識別装置の視角内に位置する必要がなく、追跡される物体内に嵌入されていてもよい。 Radio frequency identification (Radio Frequency Identification, RFID) is a type of wireless communication technology that identifies a specific target by a wireless signal and reads related data, mechanically between the identification system and the specific target. Or there is no need to build an optical contact. A radio signal is an electromagnetic field adjusted to a radio frequency, and data is uploaded from a tag attached to an article and transmitted to automatically identify and track the article. Some tags do not require batteries because they obtain energy from the electromagnetic field emitted by the identification device during identification. Some have a power supply in the tag body and actively emit radio waves. The tag contains electronically stored information and can be identified within a range of several meters. The difference from barcodes is that the radio frequency tag does not have to be located within the viewing angle of the discriminator and may be fitted within the object being tracked.

無線周波数識別の用途は極めて広範に及び、多くの業界で無線周波数識別技術を運用している。例えば、無線周波数タグを製造中の車両に装着し、メーカーが製造ライン上でのその車両の進捗を追跡する、倉庫での薬品の位置を追跡する、無線周波数タグを家畜やペットに装着し、家畜やペットを積極的に識別する（複数の家畜が同じＩＤを使用するのを防止する）、社員が無線周波数識別のＩＤ識別カードを使用して建築物の施錠エリアに進入する、車両の無線周波数トランスポンダにより有料道路及び駐車場の料金を徴収する等である。 Radio frequency identification has a very wide range of applications, and many industries operate radio frequency identification technology. For example, a radio frequency tag can be attached to a vehicle being manufactured and the manufacturer can track the vehicle's progress on the production line, track the location of chemicals in the warehouse, attach the radio frequency tag to livestock and pets, and so on. Vehicle radio that actively identifies livestock and pets (prevents multiple livestock from using the same ID), allows employees to enter the locked area of a building using a radio frequency identification ID identification card Tolls for toll roads and parking lots are collected by frequency transponders.

しかしながら、上述のこれらの応用では、無線周波数識別を読み取る装置は全て固定電源（商用電源）に接続する装置に属し、相対的に電力消費を考慮する必要がなかった。図１は従来の無線周波数識別方法を示す操作波形図である。図１に示されるように、この例では一般的に常用される無線周波数識別タグであるＥＭ４１００／４２００を例としている。その通信プロトコルは下記表１に示す。 However, in these applications described above, all the devices that read the radio frequency identification belong to the devices connected to the fixed power supply (commercial power supply), and it is not necessary to consider the relative power consumption. FIG. 1 is an operation waveform diagram showing a conventional radio frequency identification method. As shown in FIG. 1, in this example, EM4100 / 4200, which is a commonly used radio frequency identification tag, is taken as an example. The communication protocol is shown in Table 1 below.

Figure 2021144709
Figure 2021144709

９ヘッダービット及び３２データビットを有している。ＥＭ４１００／４２００のビット周期（Ｂｉｔ Ｐｅｒｉｏｄ）は５１２ｕｓであり、６４ ｂｉｔｓのデータビットを完全に復号するには３２ｍｓ必要であり、９ ヘッダービット（ｈｅａｄｅｒ ｂｉｔｓ）を完全に復号するには ４．６ｍｓ必要であるが、実際に要する検出時間は上述の数値よりも長い。仮に開始時間Ｔｏｆｆを１００ｍｓとし、消費電力を５ｍＡとする場合、開始時間Ｔｏｎは３２ｍｓであり、消費電力は４５ｍＡであり、平均消費電力（１００＊５＋３６．６＊４５）／１３６．６≒１５．７ｍＡが得られる。 It has 9 header bits and 32 data bits. The bit period (Bit Period) of EM4100 / 4200 is 512 us, 32 ms is required to completely decode 64 bits of data bits, and 4.6 ms is required to completely decode 9 header bits. However, the actual detection time required is longer than the above-mentioned numerical value. Assuming that the start time Toff is 100 ms and the power consumption is 5 mA, the start time Ton is 32 ms, the power consumption is 45 mA, and the average power consumption (100 * 5 + 36.6 * 45) /136.6≈15. 7mA is obtained.

しかしながら、無線周波数識別技術を電池を有している装置に適用する場合、このような消費電力量は受け入れられなかった。上述の技術にとって、消費電力を減らせば開始時間Ｔｏｆｆを延長できるが、反応速度が低下するという副作用があった。 However, when the radio frequency identification technique is applied to a device having a battery, such power consumption is not accepted. For the above-mentioned technique, the start time Toff can be extended by reducing the power consumption, but there is a side effect that the reaction speed is lowered.

そこで、本発明者は上記の欠点が改善可能と考え、鋭意検討を重ねた結果、合理的設計で上記の課題を効果的に改善する本発明の提案に至った。 Therefore, the present inventor considers that the above-mentioned drawbacks can be improved, and as a result of diligent studies, he / she has come up with a proposal of the present invention for effectively improving the above-mentioned problems with a rational design.

本発明は、かかる事情に鑑みてなされたものであり、その目的とするところは、低消費電力の無線周波数識別方法と装置を提供することにある。換言すれば、電源が限られる状況で消費電力量を減らし、装置に長時間動作を維持させる。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a radio frequency identification method and an apparatus having low power consumption. In other words, it reduces power consumption and keeps the device running for extended periods of time in situations where power is limited.

上記課題を解決するために、本発明のある態様の低消費電力の無線周波数識別方法は、無線周波数識別タグ読み取り装置に適用し、
常態スリープモードに進むステップＡと、
各所定時間にウェイクアップシーケンスを実行し、且つコイルから検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）を送信するステップＢと、
前記コイルのエネルギーの大きさが閾値未満か否かを検出するステップＣと、
前記コイルのエネルギーの大きさが前記閾値を超えている場合、ステップＡに戻るステップＤと、を含む。 In order to solve the above problems, the low power consumption radio frequency identification method of the present invention is applied to a radio frequency identification tag reader.
Step A to proceed to normal sleep mode and
Step B, in which a wake-up sequence is executed at each predetermined time and a detection signal (Probe Signal) is transmitted from the coil,
Step C for detecting whether or not the energy magnitude of the coil is less than the threshold value,
When the magnitude of the energy of the coil exceeds the threshold value, step D returning to step A is included.

また、本発明に係る低消費電力の無線周波数識別方法において、前記コイルのエネルギーの大きさが前記閾値を超えている場合にステップＡに戻る前に、背景値に基づいて補正閾値を提供し、且つ前記補正閾値により前記閾値を代替する閾値補正シーケンスを実行するステップをさらに含む。 Further, in the low power consumption radio frequency identification method according to the present invention, when the energy magnitude of the coil exceeds the threshold value, a correction threshold value is provided based on the background value before returning to step A. It further includes a step of executing a threshold correction sequence that substitutes the threshold with the correction threshold.

また、本発明に係る低消費電力の無線周波数識別方法において、前記コイルのエネルギーの大きさが前記閾値未満である場合、搬送波信号を持続的に送信するステップと、タグが返信した返信データを受信するステップと、前記返信データを復号するステップと、をさらに含む。 Further, in the low power consumption radio frequency identification method according to the present invention, when the energy magnitude of the coil is less than the threshold value, the step of continuously transmitting the carrier signal and the reply data returned by the tag are received. A step of decoding the reply data and a step of decoding the reply data are further included.

また、本発明に係る低消費電力の無線周波数識別方法において、前記返信データを復号した後、無線周波数識別コードを取得したか否かを判断するステップと、否と判断した場合、閾値補正シーケンスを実行し、背景値に基づいて補正閾値を提供し、且つ前記補正閾値により前記閾値を代替するステップと、をさらに含む。 Further, in the low power consumption radio frequency identification method according to the present invention, after decoding the reply data, a step of determining whether or not a radio frequency identification code has been acquired, and if it is determined, a threshold value correction sequence is performed. It further comprises a step of performing, providing a correction threshold based on the background value, and substituting the threshold with the correction threshold.

また、本発明の別の態様は、低消費電力の無線周波数識別装置である。この装置は、
コイルを含むＬＣ共振回路と、
前記ＬＣ共振回路に接続しているウェイクアップ回路と、を備え、
前記低消費電力の無線周波数識別装置は常態スリープモードに運用し、
各所定時間でウェイクアップシーケンスを実行し、且つ前記コイルから検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）を送信し、
前記ウェイクアップ回路が前記コイルのエネルギーの大きさが閾値未満か否かを検出し、前記コイルのエネルギーの大きさが前記閾値を超えている場合、前記常態スリープモードに戻る。 Another aspect of the present invention is a low power consumption radio frequency identification device. This device
LC resonant circuit including coil and
A wake-up circuit connected to the LC resonance circuit is provided.
The low power consumption radio frequency identification device is operated in the normal sleep mode and operated.
A wake-up sequence is executed at each predetermined time, and a detection signal (Probe Signal) is transmitted from the coil.
The wake-up circuit detects whether or not the energy magnitude of the coil is less than the threshold value, and if the energy magnitude of the coil exceeds the threshold value, the process returns to the normal sleep mode.

また、本発明に係る低消費電力の無線周波数識別装置において、ウェイクアップ回路はピーク検出器と、フィルター回路と、比較回路と、を備えている。ピーク検出器は前記コイルの電圧ピーク値の検出に用い、ピーク信号を出力する。フィルター回路は前記ピーク検出器に接続し、前記ピーク信号を受信し、ローパスフィルタを実行し、フィルター信号を出力する。比較回路は前記フィルター信号を受信する第一入力端及び閾値信号を受信する第二入力端を含み、比較回路が出力する比較信号が第一状態にある時間が閾値時間より長い場合、前記低消費電力の無線周波数識別装置を前記常態スリープモードに戻るように制御し、且つ背景値に基づいて前記閾値信号を調整する補正シーケンスを実行する。 Further, in the low power consumption radio frequency identification device according to the present invention, the wakeup circuit includes a peak detector, a filter circuit, and a comparison circuit. The peak detector is used to detect the voltage peak value of the coil and outputs a peak signal. The filter circuit is connected to the peak detector, receives the peak signal, executes a low-pass filter, and outputs a filter signal. The comparison circuit includes a first input end for receiving the filter signal and a second input end for receiving the threshold signal, and when the comparison signal output by the comparison circuit is in the first state for a longer time than the threshold time, the low consumption A correction sequence is executed that controls the power radio frequency identification device to return to the normal sleep mode and adjusts the threshold signal based on the background value.

また、本発明に係る低消費電力の無線周波数識別装置において、比較回路が出力する比較信号が第一状態にある時間が閾値時間より短い場合、前記低消費電力の無線周波数識別装置が搬送波信号を持続的に送信するように制御し、タグが返信した返信データを受信し、前記返信データを復号する。 Further, in the low power consumption radio frequency identification device according to the present invention, when the comparison signal output by the comparison circuit is in the first state for a shorter time than the threshold time, the low power consumption radio frequency identification device outputs a carrier signal. It controls to continuously transmit, receives the reply data replied by the tag, and decodes the reply data.

また、本発明に係る低消費電力の無線周波数識別装置において、前記ウェイクアップ回路は、前記閾値信号を出力するためのデジタル−アナログ変換回路をさらに備えている。前記低消費電力の無線周波数識別装置が前記補正シーケンスを実行する際に、前記デジタル−アナログ変換回路が入力したデジタル閾値を調整し、前記閾値信号が調整されている。 Further, in the low power consumption radio frequency identification device according to the present invention, the wakeup circuit further includes a digital-to-analog conversion circuit for outputting the threshold signal. When the low power consumption radio frequency identification device executes the correction sequence, the digital threshold value input by the digital-to-analog conversion circuit is adjusted, and the threshold value signal is adjusted.

本発明の精神は、常態スリープモードを利用し、搬送波信号（検出信号）を短時間送信し、コイルのエネルギーの大きさを検出することで、コイルに無線周波数タグがあるか否か判断し、これにより無線周波数識別読み取り装置の消費電力量を減らす。よって、本発明が電池を使用している装置に適用可能になる。 The spirit of the present invention is to use the normal sleep mode, transmit a carrier signal (detection signal) for a short time, and detect the magnitude of the energy of the coil to determine whether or not the coil has a radio frequency tag. This reduces the power consumption of the radio frequency identification reader. Therefore, the present invention can be applied to a device using a battery.

本発明の他の特徴については、本明細書及び添付図面の記載により明らかにする。 Other features of the present invention will be clarified by the description in the present specification and the accompanying drawings.

従来の無線周波数識別方法を示す操作波形図である。It is an operation waveform figure which shows the conventional radio frequency identification method. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置を示す回路ブロック図である。It is a circuit block diagram which shows the low power consumption radio frequency identification apparatus which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別方法を示すフローチャートである。It is a flowchart which shows the low power consumption radio frequency identification method which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別方法を示すフローチャートである。It is a flowchart which shows the low power consumption radio frequency identification method which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別方法の３０５ステップのサブステップを示すフローチャートである。It is a flowchart which shows the substep of 305 steps of the low power consumption radio frequency identification method which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置のウェイクアップ回路２０２を示す回路図である。It is a circuit diagram which shows the wake-up circuit 202 of the low power consumption radio frequency identification apparatus which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがない操作波形図である。It is an operation waveform figure which does not have a radio frequency tag in the low power consumption radio frequency identification device which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがある操作波形図である。FIG. 5 is an operation waveform diagram in which a radio frequency tag is provided in a low power consumption radio frequency identification device according to a preferred embodiment of the present invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがない操作波形図である。It is an operation waveform figure which does not have a radio frequency tag in the low power consumption radio frequency identification device which concerns on a preferable embodiment of this invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがある操作波形図である。FIG. 5 is an operation waveform diagram in which a radio frequency tag is provided in a low power consumption radio frequency identification device according to a preferred embodiment of the present invention. 本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置のウェイクアップ回路２０２を示す回路図である。It is a circuit diagram which shows the wake-up circuit 202 of the low power consumption radio frequency identification apparatus which concerns on a preferable embodiment of this invention.

本発明における好適な実施の形態について、添付図面を参照して説明する。尚、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。 A preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. Moreover, not all of the configurations described below are essential requirements of the present invention.

図２は本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置を示す回路ブロック図である。図２を参照すれば、低消費電力の無線周波数識別装置は制御回路２００と、ＬＣ共振回路２０１と、ウェイクアップ回路２０２と、を備えている。ＬＣ共振回路２０１はスイッチ回路２０３と、コイルＬ１と、静電容量Ｃ１と、を含む。ウェイクアップ回路２０２は前記ＬＣ共振回路に接続している。説明のために、本発明は電池で駆動する無線周波数タグ読み取り装置を例にする。省電力を達成するため、この無線周波数タグ読み取り装置は平時は常態スリープモードで運用している。１００ｍｓ のような各所定時間でウェイクアップシーケンスを１回実行する。 FIG. 2 is a circuit block diagram showing a low power consumption radio frequency identification device according to a preferred embodiment of the present invention. Referring to FIG. 2, the low power consumption radio frequency identification device includes a control circuit 200, an LC resonance circuit 201, and a wakeup circuit 202. The LC resonance circuit 201 includes a switch circuit 203, a coil L1, and a capacitance C1. The wake-up circuit 202 is connected to the LC resonance circuit. For illustration purposes, the present invention exemplifies a battery-powered radio frequency tag reader. In order to achieve power saving, this radio frequency tag reader is operated in the normal sleep mode in normal times. The wakeup sequence is executed once at each predetermined time such as 100 ms.

無線周波数タグ読み取り装置がウェイクアップした場合、制御回路２００がコイルＬ１から検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）ＰＢを送信するようにＬＣ共振回路２０１を制御する。この検出信号ＰＢは２５０ｕｓのような極短い搬送波信号である。また、ウェイクアップ回路２０２がコイルＬ１のエネルギーの大きさ（一般的には、コイルの信号のエンベロープ（ｅｎｖｅｌｏｐ）で判断するが、本発明はこの限りではない）が閾値未満か否かを検出する。閾値は主にコイルＬ１に無線周波数タグがあるか否かを判断するために用いている。コイルＬ１に無線周波数タグがある場合、コイルＬ１が送信する検出信号ＰＢのエネルギーを無線周波数タグが消費する。よって、検出信号ＰＢが上述の閾値より低い場合、コイルＬ１に無線周波数タグがあると判定する。コイルＬ１上のエネルギーの大きさ（コイルＬ１のエンベロープ）が閾値を超えている場合、コイルＬ１に無線周波数タグがないと判定する。この際、制御回路２００は本発明の実施例に係る低消費電力の無線周波数識別装置を常態スリープモードに戻るように制御する。上述の実施例について、検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）ＰＢが２５０ｕｓしかないため、磁場を持続的に提供する従来の方式に比べ、１００ｍｓ毎に信号を１回送信する条件では、消費電力を約１／４００に減少させる。仮に共振電流（ｒｅｓｏｎａｎｔ ｃｕｒｒｅｎｔ）が４５ｍＡである場合、先行技術に比べて５．１１２５ｍＡに減少する。この値はほぼ待機電流に相当する。全時間待機する状況に比較し、消費電力は約１００ｕＡ／ｓ増加するのみである。 When the radio frequency tag reader wakes up, the control circuit 200 controls the LC resonance circuit 201 so as to transmit a detection signal (Probe Signal) PB from the coil L1. This detection signal PB is an extremely short carrier signal such as 250us. Further, the wakeup circuit 202 detects whether or not the magnitude of the energy of the coil L1 (generally determined by the envelope of the coil signal, but the present invention is not limited to this) is less than the threshold value. .. The threshold value is mainly used to determine whether or not the coil L1 has a radio frequency tag. When the coil L1 has a radio frequency tag, the radio frequency tag consumes the energy of the detection signal PB transmitted by the coil L1. Therefore, when the detection signal PB is lower than the above threshold value, it is determined that the coil L1 has a radio frequency tag. When the magnitude of energy on the coil L1 (envelope of the coil L1) exceeds the threshold value, it is determined that the coil L1 does not have a radio frequency tag. At this time, the control circuit 200 controls the low power consumption radio frequency identification device according to the embodiment of the present invention so as to return to the normal sleep mode. In the above-described embodiment, since the detection signal (Probe Signal) PB is only 250us, the power consumption is reduced to about 1 / of the power consumption under the condition that the signal is transmitted once every 100 ms as compared with the conventional method of continuously providing the magnetic field. Reduce to 400. If the resonant current is 45 mA, it is reduced to 5.1125 mA as compared with the prior art. This value almost corresponds to the standby current. Compared to the situation of waiting for all hours, the power consumption is only increased by about 100 uA / s.

図３は本発明の好ましい実施形態に係る低消費電力の無線周波数識別方法を示すフローチャートである。図３に示すように、本実施例では、低消費電力の無線周波数識別方法は下記ステップを含む。
ステップＳ３０１：開始。
ステップＳ３０２：常態スリープモードに進む。
ステップＳ３０３：各所定時間にウェイクアップシーケンスを実行し、且つコイルから検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）を送信する。
ステップＳ３０４：コイルのエネルギーの大きさが閾値未満か否か検出する。コイルのエネルギーの大きさが閾値を超えている場合、ステップ３０２に戻り、常態スリープモードを持続する。コイルのエネルギーの大きさが閾値未満である場合、コイルのタグが上述の検出信号のエネルギーを消費したことを示し、ステップＳ３０５に進む。
ステップＳ３０５：復号シーケンスを実行する。 FIG. 3 is a flowchart showing a low power consumption radio frequency identification method according to a preferred embodiment of the present invention. As shown in FIG. 3, in this embodiment, the low power consumption radio frequency identification method includes the following steps.
Step S301: Start.
Step S302: The normal sleep mode is entered.
Step S303: A wake-up sequence is executed at each predetermined time, and a detection signal (Probe Signal) is transmitted from the coil.
Step S304: Detects whether or not the magnitude of the energy of the coil is less than the threshold value. If the magnitude of the energy of the coil exceeds the threshold value, the process returns to step 302 and the normal sleep mode is maintained. If the magnitude of the energy of the coil is less than the threshold value, it indicates that the tag of the coil has consumed the energy of the detection signal described above, and the process proceeds to step S305.
Step S305: The decryption sequence is executed.

図４は本発明の好ましい実施形態に係る低消費電力の無線周波数識別方法を示すフローチャートである。図３と図４を参照すれば、図４の実施例では、背景値に基づいて補正閾値を提供し、且つ前記補正閾値により前記閾値を代替する閾値補正シーケンスを実行するステップＳ４０１を別途増加している。ユーザーが不注意で導体または他の物品をコイル付近に置いた場合、検出信号のエネルギーが吸収され、低消費電力の無線周波数識別装置が誤判定を下す確率が上昇する。誤判定が起こる確率を低下させるため、この実施例では、背景値にさらに基づいて閾値を補正し、誤判定の発生を回避している。 FIG. 4 is a flowchart showing a low power consumption radio frequency identification method according to a preferred embodiment of the present invention. Referring to FIGS. 3 and 4, in the embodiment of FIG. 4, the step S401 for providing the correction threshold value based on the background value and executing the threshold value correction sequence in which the threshold value is substituted by the correction threshold value is separately increased. ing. If the user inadvertently places a conductor or other object near the coil, the energy of the detection signal will be absorbed, increasing the likelihood that the low power radio frequency discriminator will make a false positive. In order to reduce the probability of erroneous determination, in this embodiment, the threshold value is further corrected based on the background value to avoid the occurrence of erroneous determination.

図５は本発明の好ましい実施形態に係る低消費電力の無線周波数識別方法の３０５ステップのサブステップを示すフローチャートである。図５を参照すれば、ステップＳ３０５のサブステップを下記に示す。
ステップＳ５０１：搬送波信号を持続的に送信する。コイルにタグがあると判断した場合、搬送波信号を持続的に送信し、タグにエネルギーを供給すると共にタグからの返信データを待つ。
ステップＳ５０２：タグが返信した返信データを受信する。
ステップＳ５０３：上述の返信データを復号する。
ステップＳ５０４：無線周波数識別コードを取得したか否かを判断する。否と判断した場合、ステップＳ３０４において誤判定があったことを示し、閾値に問題がある可能性があり、修正が必要となり、ステップＳ５０５に進む。取得したと判断した場合、ステップＳ５０６に進む。
ステップＳ５０５；否と判断した場合、閾値補正シーケンスを実行し、背景値に基づいて補正閾値を提供し、且つ前記補正閾値により前記閾値を代替する。その後、ステップＳ３０２に戻り、持続的にスリープ省電力モードに進む。閾値が修正された後には誤判定が容易に起こらなくなり、ウェイクアップが実行されず、さらなる省電力効果を達成させる。
ステップＳ５０６；取得したと判断した場合、ウェイクアップを実行すると共にタグが対応する動作を行う。 FIG. 5 is a flowchart showing a sub-step of 305 steps of the low power consumption radio frequency identification method according to the preferred embodiment of the present invention. With reference to FIG. 5, the substeps of step S305 are shown below.
Step S5011: The carrier signal is continuously transmitted. When it is determined that the coil has a tag, a carrier signal is continuously transmitted to supply energy to the tag and wait for reply data from the tag.
Step S502: Receive the reply data returned by the tag.
Step S503: Decrypt the reply data described above.
Step S504: It is determined whether or not the radio frequency identification code has been acquired. If it is determined to be no, it indicates that there was an erroneous determination in step S304, there is a possibility that there is a problem with the threshold value, correction is required, and the process proceeds to step S505. If it is determined that the acquisition has been obtained, the process proceeds to step S506.
Step S505; If it is determined to be negative, a threshold value correction sequence is executed, a correction threshold value is provided based on the background value, and the threshold value is substituted by the correction threshold value. After that, the process returns to step S302 and continuously proceeds to the sleep power saving mode. After the threshold is corrected, erroneous determination does not easily occur, wakeup is not executed, and further power saving effect is achieved.
Step S506; If it is determined that the tag has been acquired, the wakeup is executed and the tag performs the corresponding operation.

図６は本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置のウェイクアップ回路２０２を示す回路図である。図６を参照すれば、このウェイクアップ回路２０２はピーク検出器６０１と、フィルター回路６０２と、比較回路６０３と、を備えている。ピーク検出器６０１はこの実施例では、ダイオード、電気抵抗、及び静電容量で実施し、コイルＬ１の電圧ピーク値の検出に用い、ピーク信号ＶＰを出力する。フィルター回路６０２はこの実施例では、電気抵抗及び静電容量で実施し、ピーク検出器６０１に接続し、ピーク信号ＶＰを受信し、ローパスフィルタを実行し、フィルター信号ＶＦを出力する。比較回路６０３はフィルター信号ＶＦを受信する第一入力端及び閾値信号（この実施例では基準電圧）Ｖｒｅｆを受信する第二入力端を含み、比較回路の出力端からは比較信号ＣＰを出力する。 FIG. 6 is a circuit diagram showing a wake-up circuit 202 of a low power consumption radio frequency identification device according to a preferred embodiment of the present invention. Referring to FIG. 6, the wakeup circuit 202 includes a peak detector 601, a filter circuit 602, and a comparison circuit 603. In this embodiment, the peak detector 601 is implemented with a diode, an electric resistance, and a capacitance, is used for detecting the voltage peak value of the coil L1, and outputs a peak signal VP. In this embodiment, the filter circuit 602 is implemented with electrical resistance and capacitance, is connected to the peak detector 601 to receive the peak signal VP, execute the low-pass filter, and output the filter signal VF. The comparison circuit 603 includes a first input end for receiving the filter signal VF and a second input end for receiving the threshold signal (reference voltage in this embodiment) Vref, and outputs the comparison signal CP from the output end of the comparison circuit.

図７Ａは本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがない操作波形図である。図７Ｂは本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがある操作波形図である。図７Ａと図７Ｂを参照すれば、ＰＢは検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）を示し、ＶＦはフィルター信号を示す。無線周波数識別タグがない状況ではフィルター信号ＶＦが殆ど減衰しないが、無線周波数識別タグがある状況ではフィルター信号ＶＦが大きく減衰することが分かる。 FIG. 7A is an operation waveform diagram in which the low power consumption radio frequency identification device according to the preferred embodiment of the present invention does not have a radio frequency tag. FIG. 7B is an operation waveform diagram in which the low power consumption radio frequency identification device according to the preferred embodiment of the present invention has a radio frequency tag. With reference to FIGS. 7A and 7B, PB represents a detection signal (Probe Signal) and VF represents a filter signal. It can be seen that the filter signal VF is hardly attenuated in the presence of the radio frequency identification tag, but the filter signal VF is significantly attenuated in the presence of the radio frequency identification tag.

図８Ａは本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがない操作波形図である。図８Ｂは本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置に無線周波数タグがある操作波形図である。図８Ａと図８Ｂを参照すれば、上述のように、無線周波数識別タグがない状況ではフィルター信号ＶＦが殆ど減衰せず、よって、フィルター信号ＶＦが基準電圧Ｖｒｅｆより大きい状態が長時間続き、比較信号ＣＰが正飽和状態に長時間維持される。無線周波数識別タグがない状況ではフィルター信号ＶＦが大きく減衰し、よって、フィルター信号ＶＦが基準電圧Ｖｒｅｆより大きい状態は短時間しか続かず、比較信号ＣＰが正飽和状態に短時間しか維持されない。制御回路２００は比較信号ＣＰが正飽和状態に維持される時間の長さによって、コイルＬ１にタグがあるか否か判断する。 FIG. 8A is an operation waveform diagram in which the low power consumption radio frequency identification device according to the preferred embodiment of the present invention does not have a radio frequency tag. FIG. 8B is an operation waveform diagram in which the low power consumption radio frequency identification device according to the preferred embodiment of the present invention has a radio frequency tag. With reference to FIGS. 8A and 8B, as described above, the filter signal VF is hardly attenuated in the absence of the radio frequency identification tag, and thus the filter signal VF remains larger than the reference voltage Vref for a long time and is compared. The signal CP is maintained in a positive saturation state for a long time. In the absence of the radio frequency identification tag, the filter signal VF is greatly attenuated, so that the state in which the filter signal VF is larger than the reference voltage Vref lasts only for a short time, and the comparison signal CP is maintained in the positive saturation state for only a short time. The control circuit 200 determines whether or not the coil L1 has a tag based on the length of time that the comparison signal CP is maintained in the positive saturation state.

図９は本発明の好ましい実施形態に係る低消費電力の無線周波数識別装置のウェイクアップ回路２０２を示す回路図である。図６と図９を参照すれば、この２つの回路の差異は、このウェイクアップ回路２０２にはデジタル−アナログコンバーター９０１を別途増設している点である。本実施例では、低消費電力の無線周波数識別装置が背景値に基づいて上述の補正シーケンスを実行する際に、この基準電圧は、内部のデジタル閾値を上述のデジタル−アナログコンバーター９０１に出力し、デジタル−アナログコンバーター９０１によりデジタル閾値をアナログの基準電圧Ｖｒｅｆに変換し、これによりこの基準電圧を閾値信号の代表としている。 FIG. 9 is a circuit diagram showing a wake-up circuit 202 of a low power consumption radio frequency identification device according to a preferred embodiment of the present invention. Referring to FIGS. 6 and 9, the difference between the two circuits is that a digital-to-analog converter 901 is separately added to the wakeup circuit 202. In this embodiment, when a low power radio frequency discriminator performs the correction sequence described above based on background values, this reference voltage outputs an internal digital threshold to the digital-to-analog converter 901 described above. The digital-to-analog converter 901 converts the digital threshold into an analog reference voltage Vref, which makes this reference voltage a representative of the threshold signal.

以上を総合すると、本発明の精神は、常態スリープモードを利用し、搬送波信号（検出信号）を短時間送信し、且つコイルのエネルギーの大きさを検出することで、コイルに無線周波数タグがあるか否かを判断することにより無線周波数識別読み取り装置の消費電力量を減らし、本発明を電池を使用する装置に適用可能にしている。また、好ましい実施例において、背景値に基づいて持続的に閾値を改変する方式により、無線周波数タグ読み取り装置の判定をさらに正確にしている。 Summarizing the above, the spirit of the present invention is that the coil has a radio frequency tag by using the normal sleep mode, transmitting a carrier signal (detection signal) for a short time, and detecting the magnitude of the energy of the coil. By determining whether or not, the power consumption of the radio frequency identification reading device is reduced, and the present invention can be applied to a device using a battery. Further, in the preferred embodiment, the determination of the radio frequency tag reading device is made more accurate by the method of continuously modifying the threshold value based on the background value.

上記の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明は、その趣旨を逸脱することなく、変更、改良され得ると共に、本発明にはその等価物が含まれることは言うまでもない。 The above embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. It goes without saying that the present invention can be modified and improved without departing from the spirit thereof, and the present invention includes an equivalent thereof.

２００ 制御回路
２０１ ＬＣ共振回路
２０２ ウェイクアップ回路
２０３ スイッチ回路
Ｌ１ コイル
Ｃ１ 静電容量
ＰＢ 検出信号
Ｓ３０１ 本発明の好ましい実施形態に係る低電力無線周波数識別方法のステップ
Ｓ３０２ 本発明の好ましい実施形態に係る低電力無線周波数識別方法のステップ
Ｓ３０３ 本発明の好ましい実施形態に係る低電力無線周波数識別方法のステップ
Ｓ３０４ 本発明の好ましい実施形態に係る低電力無線周波数識別方法のステップ
Ｓ３０５ 本発明の好ましい実施形態に係る低電力無線周波数識別方法のステップ
Ｓ４０１ 閾値補正シーケンスを実行する
Ｓ５０１ 本発明の好ましい実施形態に係る低消費電力無線周波数識別方法の３０５ステップのサブステップ
Ｓ５０２ 本発明の好ましい実施形態に係る低消費電力無線周波数識別方法の３０５ステップのサブステップ
Ｓ５０３ 本発明の好ましい実施形態に係る低消費電力無線周波数識別方法の３０５ステップのサブステップ
Ｓ５０４ 本発明の好ましい実施形態に係る低消費電力無線周波数識別方法の３０５ステップのサブステップ
Ｓ５０５ 本発明の好ましい実施形態に係る低消費電力無線周波数識別方法の３０５ステップのサブステップ
Ｓ５０６ 本発明の好ましい実施形態に係る低消費電力無線周波数識別方法の３０５ステップのサブステップ
６０１ ピーク検出器
６０２ フィルター回路
６０３ 比較回路
ＶＰ ピーク信号
ＶＦ フィルター信号
ＣＰ 比較信号
Ｖｒｅｆ 閾値信号（基準電圧）
９０１ デジタル−アナログコンバーター 200 Control circuit 201 LC Resonance circuit 202 Wake-up circuit 203 Switch circuit L1 Coil C1 Capacitance PB Detection signal S301 Low power radio frequency identification method step S302 according to a preferred embodiment of the present invention Low according to a preferred embodiment of the present invention Step S303 of the power radio frequency identification method Step S304 of the low power radio frequency identification method according to the preferred embodiment of the present invention Step S305 of the low power radio frequency identification method according to the preferred embodiment of the present invention. Step S401 of Low Power Radio Frequency Identification Method S401 Executing a Threshold Correction Sequence Substep S502 of 305 Steps of Low Power Radio Frequency Identification Method According to Preferred Embodiment of the Present S502 Low Power Radio of Low Power Radio Frequency Identification Method S502 Substep S503 of 305 steps of the frequency identification method Substep S503 of the low power consumption radio frequency identification method according to the preferred embodiment of the present invention 305 steps of the low power consumption radio frequency identification method according to the preferred embodiment of the present invention Substep S505 Substep S506 of 305 steps of the low power consumption radio frequency identification method according to the preferred embodiment of the present invention Substep 601 Peak detection of 305 steps of the low power consumption radio frequency identification method according to the preferred embodiment of the present invention. Instrument 602 Filter circuit 603 Comparison circuit VP Peak signal VF Filter signal CP Comparison signal Vref Threshold signal (reference voltage)
901 Digital-to-analog converter

Claims (8)

無線周波数識別タグ読み取り装置に適用している低消費電力の無線周波数識別方法であって、
常態スリープモードに進むステップＡと、
各所定時間にウェイクアップシーケンスを実行し、且つコイルから検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）を送信するステップＢと、
前記コイルのエネルギーの大きさが閾値未満か否かを検出するステップＣと、
前記コイルのエネルギーの大きさが前記閾値を超えている場合、ステップＡに戻るステップＤと、を含むことを特徴とする、低消費電力の無線周波数識別方法。 Radio frequency identification A low power consumption radio frequency identification method applied to tag readers.
Step A to proceed to normal sleep mode and
Step B, in which a wake-up sequence is executed at each predetermined time and a detection signal (Probe Signal) is transmitted from the coil,
Step C for detecting whether or not the energy magnitude of the coil is less than the threshold value,
A method for identifying a low power consumption radio frequency, which comprises step D, which returns to step A when the magnitude of the energy of the coil exceeds the threshold value. 前記コイルのエネルギーの大きさが前記閾値を超えている場合にステップＡに戻る前に、背景値に基づいて補正閾値を提供し、且つ前記補正閾値により前記閾値を代替する閾値補正シーケンスを実行するステップをさらに含むことを特徴とする、請求項１に記載の低消費電力の無線周波数識別方法。 Before returning to step A when the magnitude of the energy of the coil exceeds the threshold value, a threshold value correction sequence that provides a correction threshold value based on the background value and substitutes the threshold value by the correction threshold value is executed. The low power consumption radio frequency identification method according to claim 1, further comprising a step. 前記コイルのエネルギーの大きさが前記閾値未満である場合、
搬送波信号を持続的に送信するステップと、
タグが返信した返信データを受信するステップと、
前記返信データを復号するステップと、をさらに含むことを特徴とする、請求項１に記載の低消費電力の無線周波数識別方法。 When the magnitude of the energy of the coil is less than the threshold value,
Steps to continuously transmit carrier signals and
Steps to receive the reply data replied by the tag,
The low power consumption radio frequency identification method according to claim 1, further comprising a step of decoding the reply data. 前記返信データを復号した後、
無線周波数識別コードを取得したか否かを判断するステップと、
否と判断した場合、閾値補正シーケンスを実行し、背景値に基づいて補正閾値を提供し、且つ前記補正閾値により前記閾値を代替するステップと、をさらに含むことを特徴とする、請求項３に記載の低消費電力の無線周波数識別方法。 After decrypting the reply data
Steps to determine if you have obtained a radio frequency identification code,
3. The third aspect of the present invention is characterized in that, when it is determined to be negative, a threshold value correction sequence is executed, a correction threshold value is provided based on the background value, and the step of substituting the threshold value with the correction threshold value is further included. The low power consumption radio frequency identification method described. コイルを含むＬＣ共振回路と、
前記ＬＣ共振回路に接続しているウェイクアップ回路と、を備え、
低消費電力の無線周波数識別装置は常態スリープモードに運用し、
各所定時間でウェイクアップシーケンスを実行し、且つ前記コイルから検出信号（Ｐｒｏｂｅ Ｓｉｇｎａｌ）を送信し、
前記ウェイクアップ回路が前記コイルのエネルギーの大きさが閾値未満か否かを検出し、前記コイルのエネルギーの大きさが前記閾値を超えている場合、前記常態スリープモードに戻ることを特徴とする、低消費電力の無線周波数識別装置。 LC resonant circuit including coil and
A wake-up circuit connected to the LC resonance circuit is provided.
The low power consumption radio frequency identification device is operated in the normal sleep mode.
A wake-up sequence is executed at each predetermined time, and a detection signal (Probe Signal) is transmitted from the coil.
The wake-up circuit detects whether or not the energy magnitude of the coil is less than the threshold value, and if the energy magnitude of the coil exceeds the threshold value, the process returns to the normal sleep mode. Low power consumption radio frequency identification device. 前記ウェイクアップ回路は、
前記コイルの電圧ピーク値の検出に用い、ピーク信号を出力するピーク検出器と、
前記ピーク検出器に接続し、前記ピーク信号を受信し、ローパスフィルタを実行し、フィルター信号を出力するフィルター回路と、
前記フィルター信号を受信する第一入力端及び閾値信号を受信する第二入力端を含む比較回路と、を備え、
比較回路が出力する比較信号が第一状態にある時間が閾値時間より長い場合、前記低消費電力の無線周波数識別装置を前記常態スリープモードに戻るように制御し、且つ、背景値に基づいて前記閾値信号を調整する補正シーケンスを実行することを特徴とする、請求項５に記載の低消費電力の無線周波数識別装置。 The wake-up circuit
A peak detector that outputs a peak signal used to detect the voltage peak value of the coil, and
A filter circuit that connects to the peak detector, receives the peak signal, executes a low-pass filter, and outputs a filter signal.
A comparison circuit including a first input end for receiving the filter signal and a second input end for receiving the threshold signal is provided.
When the comparison signal output by the comparison circuit is in the first state for a longer time than the threshold time, the low power consumption radio frequency identification device is controlled to return to the normal sleep mode, and the comparison signal is controlled based on the background value. The low power consumption radio frequency identification device according to claim 5, wherein a correction sequence for adjusting a threshold signal is executed. 比較回路出力の比較信号が第一状態にある時間が閾値時間より短い場合、
前記低消費電力の無線周波数識別装置が搬送波信号を持続的に送信するように制御し、
タグが返信した返信データを受信し、
前記返信データを復号することを特徴とする、請求項５に記載の低消費電力の無線周波数識別装置。 When the comparison signal of the comparison circuit output is in the first state for less than the threshold time,
The low power consumption radio frequency identification device is controlled so as to continuously transmit a carrier signal,
Receive the reply data that the tag replied,
The low power consumption radio frequency identification device according to claim 5, wherein the reply data is decoded. 前記ウェイクアップ回路は、
前記閾値信号を出力するためのデジタル−アナログ変換回路をさらに備え、
前記低消費電力の無線周波数識別装置が前記補正シーケンスを実行する際に、前記閾値信号が調整するように前記デジタル−アナログ変換回路が入力されたデジタル閾値を調整することを特徴とする、請求項６に記載の低消費電力の無線周波数識別装置。 The wake-up circuit
A digital-to-analog conversion circuit for outputting the threshold signal is further provided.
The claim is characterized in that, when the low power consumption radio frequency identification device executes the correction sequence, the digital-to-analog conversion circuit adjusts the input digital threshold value so that the threshold value signal adjusts. 6. The low power consumption radio frequency identification device according to 6.
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