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    • 5. 发明申请
    • Appliance with an ic card reader and overload protection
    • 家用IC卡读卡器和过载保护
    • US20050247785A1
    • 2005-11-10
    • US10525056
    • 2003-08-08
    • Jean Bertin
    • Jean Bertin
    • G06K7/00G06K7/06
    • G06K7/0086G06K7/0013
    • The appliance comprises an IC card reader for an operation with an IC card and a power supply for providing a supply voltage, in particular for the IC card. The appliance comprises further an overload protection circuit, which simulates an IC card extraction in case of an overload of the supply voltage. The power supply is then immediately switched off to avoid any damage for the power supply. In a preferred embodiment, the IC card reader is equipped with a card presence switch for indicating to a micro-controller of the appliance, that an IC card has been inserted into the card reader. The micro-controller provides then a control signal for switching on the power supply for the operation with the IC card. The protection circuit is coupled between the supply voltage for the IC card and the signal line of the card presence switch and provides a detection of a short circuit. The protection circuit may comprise a diode, a comparator or a transistor, which switches off the power supply via a logic circuit.
    • 该器具包括用于操作IC卡的IC卡读取器和用于提供电源电压的电源,特别是用于IC卡。 该器具还包括过载保护电路,其在电源电压过载的情况下模拟IC卡提取。 电源立即关闭,以避免电源损坏。 在优选实施例中,IC卡读卡器配备有卡存在开关,用于向设备的微控制器指示IC卡已插入读卡器。 微控制器提供用于接通用于IC卡操作的电源的控制信号。 保护电路耦合在IC卡的电源电压和卡存在开关的信号线之间,并提供短路检测。 保护电路可以包括二极管,比较器或晶体管,其经由逻辑电路断开电源。