CN101149816B - 具有磁场过强保护功能的无源射频识别芯片 - Google Patents

具有磁场过强保护功能的无源射频识别芯片 Download PDF

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CN101149816B
CN101149816B CN200610200887A CN200610200887A CN101149816B CN 101149816 B CN101149816 B CN 101149816B CN 200610200887 A CN200610200887 A CN 200610200887A CN 200610200887 A CN200610200887 A CN 200610200887A CN 101149816 B CN101149816 B CN 101149816B
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varactor
radio frequency
frequency identification
power supply
generation unit
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CN101149816A (zh
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翁世芳
庄宗仁
刘建林
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/0772—Physical layout of the record carrier
    • G06K19/07735—Physical layout of the record carrier the record carrier comprising means for protecting against electrostatic discharge

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Near-Field Transmission Systems (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

本发明提供一种具有磁场过强保护功能的无源RFID芯片。目前的无源RFID芯片在天线受到强电磁场作用时会产生高电压的交流信号，因此，通过对交流信号整流所得的直流电压也成为高电压。所以出现逻辑电路发热或元件损坏。本发明通过在无源RFID芯片中增加一变容二极管来控制天线的品质因数，在天线受到强电磁场作用时降低感应能力以降低整流所得电压值，达到保护无源RFID芯片内部逻辑电路的目的。

Description

具有磁场过强保护功能的无源射频识别芯片
技术领域
本发明涉及一种无源射频识别(Radio Frequency Identification，RFID)芯片，特别是涉及一种具有磁场过强保护功能的无源RFID芯片。
背景技术
近年来，无源射频识别芯片越来越多的被使用，例如用作电子标签，此外，IC卡也是一种RFID芯片。
参阅图1，所示为现有技术下的无源RFID芯片。所述无源RFID芯片1包括一天线单元100，一电源产生单元200，一输入/输出电路单元300，一逻辑电路单元400。天线单元100与电源产生单元200连接，电源产生单元200分别与输入/输出电路单元300及一逻辑电路单元400连接。
天线电路100包括天线线路101和天线电容102。无源RFID芯片自身没有电源，其通过接收由读卡器产生的电磁波8所供给的电磁波而工作。无源RFID芯片逻辑电路单元400中的耗电由电源产生单元200供给，其可以产生直流电源VDD。VDD是在电源产生单元200中通过对天线单元100所接收到的电磁波8进行检波和平滑而产生的。电源产生单元200包括一第一二极管203，一第一电容器201，第二二极管202，一第二电容器204。第二电容器204有足够大的电容量值以向逻辑电路单元400供电。天线单元100输出给电源产生单元200的信号的负分量由第一二极管203和第二二极管202滤除，只有其正分量通过第二二极管202供给各电路。第二电容器204存储已经通过第二二极管202的正分量并在天线单元100信号为负时供电。因此，VDD基本上为恒定值，因而电源产生单元200起直流电压源的作用，其输出直流电源VDD端为电源产生单元200的电源输出端。
无源RFID芯片的优点是可以非接触的方式读出所记录的数据，可以不用电池工作，其耐用性好。但是人们还是期望得到更高的性能，例如，人们希望能使无源RFID芯片读取识别范围增大，因而读取器需要发出很强的功率。而在无源RFID芯片内天线受强电磁波作用时会产生出高交流电信号，通过对该交流电信号整流后所得到的直流电压也随之变高。因此，会出现该RFID芯片内部的逻辑电路和时钟发生器发热甚至损坏。
发明内容
有鉴于此，本发明提供具有磁场过强保护功能的无源RFID芯片，当所述无源RFID芯片接收到的磁场强度过高时降低其天线感应出的电信号电压强度。
本发明提供一种无源RFID芯片，包括一天线单元，用于接收读取器发出的电磁信号；一电源产生单元，为所述无源RFID芯片系统提供直流电源，一输入/输出电路单元300，一逻辑电路单元400；一变容二极管，该变容二极管阳极连接于所述天线单元与电源产生单元之间，其阴极接地；一二极管，该二极管阳极与所述电源产生单元电源输出端连接，阴极与天线单元连接。
本发明提供的无源RFID芯片具有磁场过强保护功能，当所述无源RFID芯片接受到的磁场强度过高时降低其天线感应出的电信号。
附图说明
图1是现有无源RFID芯片的示意图。
图2是本发明无源RFID芯片一实施方式的示意图。
具体实施方式
参阅图2，本发明具有磁场过强保护功能的无源RFID芯片一实施方式的示意图。本发明的实施方案与图1所示现有技术不同在于：在天线单元100与电源产生单元200之间接一变容二极管802，所述变容二极管802阳极连接于所述天线单元100与电源产生单元200之间，其阴极接地；在反馈通路上接一二极管801，该二极管801阳极与所述电源产生单元200的电源输出端连接，阴极与天线单元100连接。
根据无源RFID芯片各电路的安全电压值选择变容二极管802，设所述变容二极管802的阀值电压为V。当直流电源VDD输出的电压小于V时，无源RFID芯片各电路输入的为安全电压。由于VDD输出的电压小于V，变容二极管802截止。当直流电源VDD输出的电压大于V的时，变容二极管802导通。此时天线单元100与变容二极管802并联，天线单元100的品质因数(Q值)降低，感应电磁波8的能力减弱，使电源产生单元200整流后产生的直流电压VDD降低。这样避免当直流电源VDD输出的电压过高而引起无源RFID芯片各电路故障甚至烧坏。

Claims (4)

1.一种具有磁场过强保护功能的无源射频识别芯片，包括一天线单元，用于接收读取器发出的电磁信号；一输入/输出电路单元；一逻辑电路单元；一电源产生单元，为所述逻辑电路单元提供直流电源，其特征在于，所述无源射频识别芯片还包括：
一变容二极管，该变容二极管阳极连接于所述天线单元与电源产生单元之间，其阴极接地；
一二极管，该二极管阳极与所述电源产生单元电源输出端连接，阴极与天线单元连接。
2.如权利要求1所述的无源射频识别芯片，其特征在于，所述变容二极管导通时与天线单元并联，天线单元的品质因数降低。
3.如权利要求1所述的无源射频识别芯片，其特征在于，所述电源产生单元输出的电压大于所述变容二极管的阀值电压时该变容二极管导通。
4.如权利要求1所述的无源射频识别芯片，其特征在于，所述电源产生单元输出的电压小于所述变容二极管的阀值电压时该变容二极管截止。
CN200610200887A 2006-09-20 2006-09-20 具有磁场过强保护功能的无源射频识别芯片 Active CN101149816B (zh)

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CN200610200887A CN101149816B (zh) 2006-09-20 2006-09-20 具有磁场过强保护功能的无源射频识别芯片
US11/747,194 US7649461B2 (en) 2006-09-20 2007-05-10 Passive radio frequency identification chip with a variable-capacitance diode

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US9177243B2 (en) * 2013-09-03 2015-11-03 Overair Proximity Technologies Ltd. Passive RFID transponder with powered element
CN105160386A (zh) * 2014-05-28 2015-12-16 上海华虹集成电路有限责任公司 射频识别系统中的无源标签电路
GB2575685B (en) * 2018-07-20 2020-11-18 Drayson Tech Europe Ltd Circuitry for use in smart cards and other applications

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CN1143227A (zh) * 1994-10-06 1997-02-19 三菱电机株式会社 非接触式ic卡与非接触式ic卡系统
CN1385693A (zh) * 2002-05-17 2002-12-18 中国科学院上海光学精密机械研究所 中子显微镜
CN1627561A (zh) * 2003-12-11 2005-06-15 日本电气株式会社 天线设备以及使用该天线设备的无线通信装置

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US6229443B1 (en) 2000-06-23 2001-05-08 Single Chip Systems Apparatus and method for detuning of RFID tag to regulate voltage
EP1909384A3 (en) * 2006-10-06 2015-11-25 Semiconductor Energy Laboratory Co., Ltd. Rectifier circuit with variable capacitor, semiconductor device using the circuit, and driving method therefor

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1143227A (zh) * 1994-10-06 1997-02-19 三菱电机株式会社 非接触式ic卡与非接触式ic卡系统
CN1385693A (zh) * 2002-05-17 2002-12-18 中国科学院上海光学精密机械研究所 中子显微镜
CN1627561A (zh) * 2003-12-11 2005-06-15 日本电气株式会社 天线设备以及使用该天线设备的无线通信装置

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US7649461B2 (en) 2010-01-19
US20080068167A1 (en) 2008-03-20

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