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实用新型
CN205899554U 一种低功耗射频读卡电路 失效 - 权利终止

一种低功耗射频读卡电路
摘要：
本实用新型公开了一种低功耗射频读卡电路，其包括天线、功率放大电路、检波电路、滤波放大电路和微处理器；其中，微处理器输出寻卡信号并通过天线发射出去，微处理器根据返回的寻卡信号，判断是否检测到射频卡；若检测到射频卡，微处理器输出载波信号并通过天线发射出去，检波电路从返回的载波信号还原出有用信号，滤波放大电路对有用信号进行整形放大，微处理器对整形放大后的有用信号进行解码，而得到射频卡的编码数据。因此，本实用新型在工作时，只有在通过寻卡信号检测到射频卡时，才发送载波信号，从而使功耗降低，解决在无市电供电的应用场合时，需要频繁更换电池，为用户带来不便的问题。
摘要（英）：

The utility model discloses a low -power consumption radio frequency card reading circuit, it includes antenna, power amplification circuit, detection circuit, filtering and amplifying circuit and microprocessor, wherein, microprocessor output is sought the card signal and is launched through the antenna, and microprocessor seeks the card signal according to what return, judges whether detect the radio -frequency card, if detect the radio -frequency card, microprocessor output carrier signal launches through the antenna, and detection circuit restores out desired signal from the carrier signal who returns, and filtering and amplifying circuit carries out shaping amplifier to desired signal, the desired signal carrier signal 1 of microprocessor after to shaping amplifier, and obtain the carrier signal 2 of radio -frequency card. Therefore, the utility model discloses at the during operation, only when seeking the card signal detection to the radio -frequency card, just send carrier signal to messenger's consumption reduces, solves when no mains power supply's application scenario, need frequently change the battery, the problem of plaguing for the user.

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