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公开(公告)号：US4797541A
公开(公告)日：1989-01-10
申请号：US851849
申请日：1986-04-14
IPC分类号： G06K19/07 , B42D15/10 , G05F1/10 , G06K7/00 , G06K17/00 , H02J17/00 , H02M3/28 , G06K7/08 , G06K19/06
CPC分类号： G06K7/00 , G06K7/0008 , Y10S323/901
摘要： A power transfer arrangement provides regulated power transfer from a station to a contactless portable data card without the need for regulation circuitry on the card itself. The station includes a primary coil for magnetically coupling power to a secondary coil, located on the card, when the data card is brought into close association with the station. The arrangment includes a microprocessor, a power amplifier including the primary coil, a variable voltage source and apparatus for measuring current flow in the primary coil. When the portable data card is not in close association with the station, the microprocessor causes the variable voltage source to provide a sequence of stepped voltages. Quiescent current flow is measured at each step and stored in memory. When the portable data card is brought into close association with the station, the microprocessor causes the variable voltage source to provide a sequence of stepped voltages. Active current flow is measured at each step and stored in memory. Power delivered to the data card is calculated as the difference between active and quiescent currents--multiplied by the magnitude of the variable voltage source. The sequence of active current measurements continues until the calculated value of power delivered to the data card exceeds a predetermined threshold power, at which time the data card is receiving a precise, predetermined amount of power.
摘要翻译： 电力传输装置提供从站到非接触式便携式数据卡的稳定的电力传输，而不需要卡上本身的调节电路。 当数据卡与电台紧密联系时，该电台包括一个初级线圈，用于将电源耦合到位于卡上的次级线圈。 该布置包括微处理器，包括初级线圈的功率放大器，可变电压源和用于测量初级线圈中的电流的装置。 当便携式数据卡不与站相关联时，微处理器使可变电压源提供一系列阶梯电压。 在每个步骤测量静态电流，并存储在存储器中。 当便携式数据卡与电台紧密联系时，微处理器使可变电压源提供一系列阶梯电压。 在每个步骤测量有功电流，并存储在存储器中。 传输到数据卡的功率计算为有功和静态电流之间的差值乘以可变电压源的幅度。 有效电流测量的顺序继续进行，直到输送到数据卡的功率的计算值超过预定阈值功率，此时数据卡正在接收精确的预定量的功率。
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