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    • 4. 发明申请
    • Overvoltage Protection Device and Radio Frequency Receiver and Radio Frequency Identification Tag Comprising such a Device
    • 过电压保护装置及射频识别标签包含这种装置
    • US20080055086A1
    • 2008-03-06
    • US11574913
    • 2005-09-09
    • Eugenio CantatoreAlbert MarsmanGerwin Gelinck
    • Eugenio CantatoreAlbert MarsmanGerwin Gelinck
    • G08B13/14
    • G06K19/0701G06K19/0715G06K19/0723
    • An over voltage protection device on a radio frequency identification tag or in a radio frequency receiver comprises electro-magnetic coupling means between a base station and the radio frequency identification tag or radio frequency receiver. At least one ferroelectric capacitor is electrically connected to the coupling means. As long as the voltage across the ferroelectric capacitor remains below its coercive voltage, its capacitance will be linear and the tag or radio frequency receiver will behave normally. However, if the voltage across the ferroelectric capacitor exceeds the coercive voltage, the ferroelectric capacitance will experience polarization reversal and exhibit its non-linear and dissipative behavior. Connecting the ferroelectric capacitor in suitable ways to the coupling means, will result in a dumping of the voltage transferred to the electronics present on the tag or radio frequency receiver. This electronics is then protected against excessive voltages that could cause it damage.
    • 射频识别标签或射频接收机中的过电压保护装置包括基站与射频识别标签或射频接收机之间的电磁耦合装置。 至少一个铁电电容器电连接到耦合装置。 只要铁电电容器两端的电压保持低于其矫顽电压,其电容将是线性的,并且标签或射频接收器将表现正常。 然而,如果铁电电容器两端的电压超过矫顽电压,则铁电电容将经历极化反转并呈现其非线性和耗散性能。 将铁电电容器以合适的方式连接到耦合装置将导致转移到标签或射频接收器上存在的电子装置的电压的倾倒。 然后保护电子元件免受可能导致损坏的过大电压。