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Adaptive frequency tracking system used in passive sensing electronic tag reader

A technology of electronic tags and frequency tracking, which is applied in the direction of induction recording carriers, instruments, computer parts, etc., to achieve the effect of improving productivity

Active Publication Date: 2012-04-11
上海复晖信息科技有限公司
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Problems solved by technology

This can happen with readers with a fixed carrier frequency

Method used

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  • Adaptive frequency tracking system used in passive sensing electronic tag reader
  • Adaptive frequency tracking system used in passive sensing electronic tag reader
  • Adaptive frequency tracking system used in passive sensing electronic tag reader

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Embodiment Construction

[0021] Adaptive frequency tracking system for passive sensing electronic tag readers such as figure 1 . The adaptive frequency tracking system is composed of a phase-locked loop circuit 1, a drive circuit 2, a power amplifier circuit 3, a sine wave square wave conversion circuit 4, a delay circuit 5, an antenna coil L, a resonant capacitor C, and a drop resistor R. The phase-locked loop circuit includes a phase-frequency detector (PFD) 11 , a charge pump (CP) 12 , a voltage-to-current converter (V2I) 13 , a current-controlled oscillator (CCO) 14 , and a loop filter (LF) 15 .

[0022] The phase frequency detector (PFD) 11 in the phase locked loop circuit is as figure 2. The circuit includes two D flip-flops U1 and U2 with reset function, a 2-input OR gate U3, a 2-input AND gate U4, and two 2-input NAND gates U5 and U6. The input terminal of the D terminal of U1 is connected to a high level, the Clk terminal is connected to the input signal Data, the Reset terminal is connec...

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Abstract

The invention belongs to the Internet of things perception layer technology field and discloses an adaptive frequency tracking system used in a passive sensing electronic tag reader. The system comprises: a PLL circuit, a driver circuit, a power amplifier circuit, a series resonance loop formed by an antenna coil and a resonant capacitor, a voltage dropping resistor, a sine wave square wave conversion circuit and a delay circuit. The PLL circuit comprises: a PFD, a charge pump, a loop filter, a voltage current converter and a flow control oscillator. The flow control oscillator has two way quadrature output of I and Q. An I way voltage signal is output to an antenna through the driver circuit and the power amplifier circuit. After passing through the delay circuit, a Q way output voltage signal CLKQ is connected with a Data input terminal of the PFD. By using the system, the carrier wave frequency of the passive electronic tag reader can automatically track the series resonance frequency of the antenna. An emission power of the reader can reduce because the antenna resonant frequency changes caused by an environment factor, a manufacturing process factor, a working mode and the like. By using the system of the invention, the above problem can be solved and a system working distance can not be reduced. And many other problems can be solved too.

Description

technical field [0001] The invention belongs to the technical field of the sensing layer of the Internet of Things, and in particular relates to an adaptive frequency tracking system for passive sensing electronic tag readers. Background technique [0002] Passive sensing electronic tags are one of the key technologies in the sensing layer of the Internet of Things. In addition to the electronic identity (ID) number, the sensor electronic tag also has the physical information of the external environment such as temperature, humidity, pressure, acceleration, angle, chemistry, and gas. Perception systems generally include passive sensing electronic tags and readers. Energy and information are generally transmitted between low-frequency and high-frequency band tags and readers through inductive coupling. The antenna coil and capacitor of the reader form a series resonant circuit, while the antenna coil and capacitor of the sensor electronic tag form a parallel resonant circui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 沈美根冉立新皇甫江涛贺兰茂蔡旭郑立荣
Owner 上海复晖信息科技有限公司
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