Power supply processing interface in passive radio frequency identification system

A technology of power processing and radio frequency identification, applied in the direction of electromagnetic radiation induction, etc., can solve the problem of weakening the induction modulation distance

Inactive Publication Date: 2008-03-05
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because only unilateral modulation is performed between HF1 and VSSA, although there is no need to worry about the situation of insufficient voltage, it leads to the problem of weakening the induction modulation distance, and the sensitivity of the demodulation circuit must be strengthened as a corresponding solution.

Method used

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  • Power supply processing interface in passive radio frequency identification system
  • Power supply processing interface in passive radio frequency identification system
  • Power supply processing interface in passive radio frequency identification system

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Embodiment Construction

[0040] The design purpose of the present invention is to provide a stable working power supply at the tag end of the passive RFID during the AM data modulation and demodulation process of the passive RFID. In the conventional system architecture as shown in FIG. 4, the original voltage limiter 24 The overvoltage detection function and the voltage limiting function of the system are separated. The position of the overvoltage detecting elements R241 and R242 still maintains the detection of the voltage of VDDA, but the voltage limiting element M243 is moved before the bridge rectifier circuit 22, and the detection bridge The voltage change of the output VDDA of the rectification circuit 22 can directly control the peak voltages of HF and HF1 on the LC resonant circuit 21 to form an effective closed-loop device.

[0041] Please refer to FIG. 5 , which is a system architecture diagram of a passive RFID tag according to a preferred embodiment of the present invention. As shown in F...

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Abstract

The invention relates to a power processing interface of the radiofrequency identification system, which comprises a resonating circuit to sense a first modulating signal sent by a sending end as an AC voltage source, a first rectification circuit which is connected with the resonating circuit and transfer the AC voltage source into a DC voltage, a voltage monitoring circuit which is connected with the wave filter circuit and the first rectification circuit and monitor the working voltage, a second rectification circuit which is connected with the voltage clamp modulating circuit and the resonating circuit, and a voltage clamp modulating circuit which is connected with the first rectification circuit and the second rectification circuit and use the output of the voltage monitoring circuit and the corresponding monitoring working voltage to control the condition of the second rectification circuit to roadside the excess current and provide a effect lowest voltage position to the radiofrequency identification system to maintain the normal running of the radiofrequency identification system.

Description

technical field [0001] The invention relates to a power processing interface, in particular to a power processing interface of a radio frequency identification system. Background technique [0002] In the known passive radio frequency identification system (Radio Frequency Identification System, RFID), as shown in FIG. Mutual induction for energy and information transmission. Wherein, the inductor L101 is located in the resonant circuit 10 of reader01, and the inductor L111 is located in the resonant circuit 11 of tag02. The working bias voltage supply source of the passive RFID at the tag02 terminal is to use the parallel inductors L101 and L111 on the tag02 and reader01 to conduct mutual induction to generate an induced voltage. Therefore, the inductance L111 at the tag02 terminal is used to induce the induction from the inductive antenna L101 at the reader01 terminal. The fixed radio frequency carrier signal is used as the source of AC power. Then, through a full-wave ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/10
Inventor 王明坤沈俊林许绩贺陈锡彬
Owner HOLTEK SEMICON
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