KR101584953B1 - Rfid uhf rf interrupt logic circuit - Google Patents

Rfid uhf rf interrupt logic circuit Download PDF

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KR101584953B1
KR101584953B1 KR1020150011530A KR20150011530A KR101584953B1 KR 101584953 B1 KR101584953 B1 KR 101584953B1 KR 1020150011530 A KR1020150011530 A KR 1020150011530A KR 20150011530 A KR20150011530 A KR 20150011530A KR 101584953 B1 KR101584953 B1 KR 101584953B1
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South Korea
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signal
input
output
unit
control unit
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KR1020150011530A
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Korean (ko)
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서봉진
박찬영
유종규
윤형기
차정훈
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케이아이씨시스템즈(주)
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G06K19/0724Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types

Abstract

An RF interrupt logic circuit comprising a detection unit and an analog / digital conversion unit and outputting an interrupt signal using a wakeup signal included in an input external signal, wherein the external interrupt signal is a signal having a UHF band frequency as an external signal A wake-up control unit for receiving the baseband signal output from the input terminal through the detection unit and the analog-to-digital conversion unit, and outputting an interrupt signal to the interruption control unit of the output-side element, And an interrupt signal is output to an interrupt control unit of an output stage side element that needs to be activated by processing a signal and noise inputted in a crosstalk in addition to a target signal.
Therefore, in a UHF RFID UHF system using a high frequency UHF system, the wakeup function can react to only the appropriate external signals to activate and operate the necessary parts in the system, thereby reducing unnecessary consumption of battery power in dual- have. Accordingly, it is possible to stably and efficiently manage the active RFID tag having the battery, reduce the amount of useless radio signals, thereby reducing the possibility of interference and increasing the information transmission rate.

Description

{RFID UHF RF INTERRUPT LOGIC CIRCUIT}

FIELD OF THE INVENTION The present invention relates to RF (high frequency) interrupt logic circuits, and more particularly, to an RF (High Frequency) interrupt logic circuit which is used in railway vehicle management and which can receive an external signal in an RF ID tag using UHF band communication, This relates to an RF interrupt logic circuit.

RFID (Radio Frequency Identification) is a technology for recognizing information at a remote location using radio waves, and requires an RFID tag and an RFID reader. The tag is made up of an antenna and an integrated circuit, which records information in an integrated circuit and transmits information to the reader via an antenna. This information is mainly used to identify the tagged object. That is, RFID is a kind of identification technology.

RFID is a passive type that reads and communicates information of the chip only by the electric power obtained from the transmission wave of the reader according to the electric power to be used, and the battery is built in the tag, so that electric power is used to read information of the chip, (Semi-passive) that uses the power obtained from the radio wave received from the mobile phone, and Active which uses the power of the internal battery of the tag to read information of the chip and communicate the information. Many high frequency antennas are used for medium and long distance.

In addition, depending on the frequency band used for RFID communication, a low-frequency IDentification (LFID) using a low frequency of 120 to 140 kHz, a High-Frequency IDentification using an HFID using 13.56 MHz (Mhz) Frequency identification (UHFID) using a radio wave of 2.4 GHz to 2.5 GHz and a microwave frequency ID (frequency band of 868 to 956 MHz).

An integrated circuit is used in an RFID tag. An integrated circuit can store various information, and can be used for product life cycle management (PLM), logistics management, facility management, and the like. The use of RFID technology is also being introduced or considered for the management of trains and railway vehicles as well as the management of trains and operation management.

However, there are some problems in installing and using RFID tags in railway vehicles or their parts to perform the management of the history such as inspection, replacement, and disposal for production, use registration, maintenance, and disposal.

For example, VHF, TRS-Astro, and TRS-Tetra-type railway communications are frequently used in high-speed railways in accordance with train passing areas. In the case of urban railways, 2.4- to 2.5-GHz ISM bands are used for railway communications. Since the frequency band used for RFID and the frequency band used for RFID communication can overlap, this frequency band implies the possibility of various kinds of problems due to interference.

And, since such railway communication will be used more in connection with railway smart driving system or automatic driving system, techniques for solving such problems should be developed or necessary measures should be taken.

For example, in the case of using RFID technology in the management of a railway vehicle, it is possible to manage a large number of vehicles through a single or a small number of readers even in a place where many railway vehicles such as a base station are gathered by using the UHF active RFID tag On the other hand, depending on the position where the RFID tag is attached and the position of the antenna of the reader, many readers are required, and the railway vehicle to be recognized may not be recognized and an accident may occur.

Meanwhile, the use of a dual band RFID tag capable of recognizing and transmitting signals of two different UHF bands among RFID tags is proposed. In this tag, signal transmission for the relatively low frequency band 1 and signal transmission for the relatively high frequency band 2 are all possible, which is advantageous in that it can be used in both forms suitable for each band.

However, in the conventional dual-band RFID tag, the constitution of each band is separately made so that the internal elements can not mutually combine and functionally cooperate. Therefore, in order to operate as a dual band RFID active tag, It is necessary to charge or replace the battery frequently. However, in the RFID system for managing the railway car, charging and exchanging the battery in the tag is not easy and can be very troublesome operation. In some cases, It may be a lifetime.

In recent years, the issue of reducing power consumption in the entire wireless network technology has become a big issue. In the field of RFID active tag, there is a proposal of a technology related to a wake-up signal related to low power design as a method of reducing power consumption .

1 shows an example of a conventional wake-up signal detector.

In this configuration, when an external signal is input to the reception antenna, the signal is inputted to a signal discrimination unit for discriminating a wake up signal through a serial resonance circuit and an amplifier, and it is determined whether the external signal is a wake up signal.

However, when the wakeup is properly performed, the power consumption can be reduced by consuming the power only at the necessary portion of the apparatus when necessary. However, depending on the surrounding environment, the power consumption may be unnecessarily wasted.

For example, many tagged objects, and reader signals requesting information about these objects, are used in many railway car maintenance windows, in base stations, or in areas where the public uses 2.4 GHz ISM band radio waves, It is also conceivable that a reader may respond to requests for information from unneeded readers to activate the device and consume more power than would normally be needed to send information about the information request each time.

In other words, even in the conventional example as shown in FIG. 1, the wake-up signal discrimination section 20 consists of only the integrating circuit 22 and the comparator 24, which may cause a noise or other signals to wake up.

FIG. 2 is a repeater configuration for relaying a wake-up signal. Even in such a configuration, a wake-up signal is discriminated through the detector 340 and the comparator 360 while the wake-up signal is discriminated and relayed. There is a possibility of being relayed.

In such an environment, the FRID tags of many objects use up their power unnecessarily, and as a result, many RFID readers cause the problem that the signals transmitted due to the generated signals are not transmitted properly, The information may not be properly transmitted to the RFID reader in the proper correspondence.

Korean Patent Registration No. 10-1001681: Active RFID system and tag wakeup control method thereof Korean Patent Application No. 10-2009-0008672: An electronic tag recognition device of a mode conversion type and a mode conversion type Korean Patent Publication No. 10-2010-0071444: Wake-up signal detector Korean Patent Publication No. 10-2012-0071947: Wake-up signal communication system, apparatus and method, and wireless terminal US Patent No. 7,215,976: RFID DEVICE, SYSTEM AND METHOD OF OPERATION INCLUDING A HYBRID BACKSCATTER-BASED RFID TAG PROTOCOL COMPATIBLE WITH RFID, BLUETOOTH AND / OR IEEE 802.11X INFRASTRUCTURE

In the RFID UHF system such as the RFID active tag for railway vehicle management using the UHF band high frequency as described above, a flood of unnecessary signals is made in response to an external signal which is not suitable when the wakeup function is used, And an object of the present invention is to provide an RFID UHF radio frequency (RF) interrupt logic circuit having a configuration capable of overcoming unnecessary consumption of electric power and eventually overcoming the problem of tag management and railway vehicle management difficulties.

The present invention relates to an RFID UHF radio frequency (RF) interrupt logic circuit having a configuration capable of accurately discriminating an external signal and generating an interrupt signal so that the battery management of an active tag can be stably and efficiently performed in an RFID system using the UHF band. The purpose is to provide.

In order to achieve the above object, a high-frequency interrupt logic circuit of the present invention is for processing an external signal of a received UHF band

The output side element which receives the output of the normal detection section and the normal analog / digital conversion section and processes the output to perform processing for eliminating the signal and noise inputted by the interference other than the target signal (desired interrupt signal) And a wake-up control unit for outputting an interrupt signal for controlling an element requiring activation of a rear end such as an interrupt control unit of the wake-up control unit.

The wakeup control unit of the present invention has an input terminal connected to the detection unit or the analog / digital conversion unit, an output terminal connected to an element outside the high frequency interrupt logic circuit, for example, an interrupt control unit of the microprocessor, , A signal rectifying part, a low pass filter part, and an on-off signal control part.

In the present invention, the data input unit may include a capacitor provided on an input / output path, and a resistor between a rear end of the capacitor and the ground.

In the present invention, the signal rectifying unit may include a diode installed in a forward direction on an input / output path, and a diode installed in a reverse direction between a front end of the diode and a ground.

In the present invention, the low-pass filter unit may include a capacitor between the ground and the ground at the front end on the input / output path and a resistor between the ground and the rear end of the input / output path.

In the present invention, the on-off signal control unit includes a transistor type, for example, an FET type and an on-off switch, and connects the input terminal of the FET to the ground, the switching signal terminal of the FET to the front end on the input / output path, .

In the present invention, the high-frequency interrupt circuit unit may include a diode detection unit, an A / D conversion unit, and a wakeup control unit in order, and a DC block formed by a capacitor between the diode detection unit and the AD conversion unit.

According to the present invention, in an RFID UHF system using a UHF band high frequency, when the wakeup function is used, it is possible to activate and operate a necessary part in the system in response to an appropriate external signal, thereby reducing unnecessary consumption of battery power in an active RFID tag . Accordingly, it is possible to stably and efficiently manage the active RFID tag having the battery, and to improve the utilization of the tag attached device.

According to the present invention, in an environment where a plurality of RFID communications can be performed, a system element generates a transmission radio wave for information transmission in response to only a suitable signal, thereby reducing the amount of useless radio signals, thereby reducing the possibility of interference, The transmission rate can be increased.

FIG. 1 and FIG. 2 are conceptual diagrams schematically showing a signal discrimination circuit configuration used for discriminating a conventional wake-up signal,
FIG. 3 is a configuration diagram showing a dual-band RFID active tag that can be used with the high-frequency interrupt logic circuit of the present invention incorporated therein;
4 is a configuration diagram schematically showing an embodiment of the high-frequency interrupt logic circuit of the present invention,
5 is a circuit diagram showing the wake-up control unit in more detail in Fig. 4 according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic diagram showing a schematic configuration of a dual band RFID active tag for railway vehicle management employing the high frequency interrupt logic circuit of the present invention for a UHF band received signal.

Here, the dual band RFID active tag for railway vehicle management includes a first (900 MHz band) RFID tag unit 130, a second (2.4 GHz) band RFID tag unit 170 and a rechargeable battery 125 A high-frequency interrupt logic circuit 140 for receiving an external first-band radio wave to generate an interrupt signal, a microprocessor 150, and an external device (not shown). The external first-band radio wave receiving circuit, And a sensor signal input port for signal input of the sensor 155.

At this time, the external first-band radio wave receiving unit includes a first band receiving antenna 111, a band-pass filter (BPF) 113, and two distributors (DIV) 115. The band-pass filter 113 transmits only the radio waves of a predetermined frequency band from the externally input first band wave to the first distributor. The first distributor distributes the radio waves to the charging circuit and the second distributor and delivers them. The second distributor distributes the received radio waves to the first band RFID tag unit and the high frequency interrupt logic circuit 140 and transmits the same.

Filtering the bandpass can be done by using an impedance matching circuit or the like, and the external wave includes a continuous wave for energy transfer for charging the tag and a signal wave for signal transmission, including a wake-up signal .

The charging circuit unit 120 includes a RF-to-DC converter for converting a high-frequency signal into a direct current (DC). The charging circuit unit 120 receives the external radio wave The charging voltage can be applied to the battery 125 constituting the power supply unit.

The RF (high frequency) interrupt logic circuit 140 forms an interrupt signal, which is capable of activating the microprocessor 150 on the external radio wave in a predetermined frequency band through the bandpass filter, and transmits the interrupt signal to the microprocessor 150.

The first band RFID tag unit 130 is a semi-active RFID tag that performs self-stored unique information or other data processing through an internal power source and can read information using an external signal received through the receiving antenna 111. [

Information related to railway car management such as sensor information and time information based on an internal clock or a real time clock (RTC) through a microprocessor and stores the data with the microprocessor 150 and the clock 157 ) I2C communication with the communication line for.

The microprocessor 150 is connected to the second band RFID tag unit 170 via a serial peripheral interface (SPI) bus and receives signals. The microprocessor 150 receives an interrupt signal of the high frequency interrupt logic circuit 140, And activates the second band RFID tag unit 170 again. The signal for activation may be a reset signal for resetting the second band RFID tag unit 170 and operating it for a predetermined time. In addition, the microprocessor 150 is also connected to the sensor 155 and the clock 157 to exchange signals.

The power supply unit includes a rechargeable battery 125 and can be charged through the charging circuit unit 120. The battery 125 is connected to the first band RFID tag unit 130, the second band RFID tag unit 170, And can be connected to each of the operating elements such as the processor 150 through a voltage drop device (LDO: Low Drop Out) 127 to supply a constant voltage to each element.

The second band RFID tag unit 170 may use various types of tags conventionally used in accordance with the data of the sensor 155 and the surrounding environment and purpose, may be an RTLS chip having position information for real-time position tracking, Processor 150 and a power source. However, when a signal is input through the microprocessor, a signal is generated in the RF interrupt logic circuit 140 to be activated, and power is supplied from the power source. Second band (2.4 gigahertz) The RFID tag unit 170 may include a radio wave transmitting / receiving unit for receiving an external radio wave signal such as a transmission / reception antenna and a filter of itself, or a radio wave signal to the outside, and a register as a temporary storage device.

By using such a dual band tag, the battery power consumption can be saved by always using the active tag of the active RFID tag in the 2.4 GHz band for practical information exchange, By reducing the possibility of interference of 2.4 GHz ISM band communication according to the surrounding conditions and by using extraordinary operation or overlapping complementary operation where at least some contents of 900 MHz band and 2.4 GHz band communication overlap, .

However, in order for the dual band RFID tag having such a configuration to function normally, the second band RFID tag portion must be activated and operated in a timely manner, that is, proper operation of the RF (high frequency) interrupt logic circuit should be performed. In particular, the RF (high frequency) interrupt logic circuit must activate the microprocessor and the second band RFID tag portion only when receiving an appropriate external wake up signal without reacting to noise or other inappropriate signals.

In the present invention, the RF interrupt logic circuit 140 is configured to receive an external signal in the UHF band including a wakeup signal. Of course, direct reception uses a receive antenna, and a conventional bandpass filter or divider is used in the receiving path, but does not substantially affect the wake-up signal.

(A / D) converter 143 and an analog / digital (A / D) converter 143 for receiving the external signal as shown in FIG. The specific configuration of the detection unit 141 or the A / D conversion unit 143 may be the same or similar to that of the existing wakeup discriminator.

The wakeup signal is input to another element that requires wakeup as a direct interrupt signal using the output of the detection section or the output of the analog / digital conversion section. However, in this case, the wakeup operation is performed separately from the detection section 141 and the analog / A control unit 145 is provided and a signal obtained through the detection unit 141 and the analog / digital conversion unit 143 is input to the wakeup control unit 145.

The wakeup control unit 145 processes the input signal again so that an interrupt signal to be input to another element (for example, the microprocessor of FIG. 3) is generated only when the external signal receiving unit receives the correct wakeup signal.

5 shows an embodiment of the configuration of the high-frequency interrupt logic circuit 140 of the present invention. Here, the detailed configuration of the wake-up control unit 145, which is focused on a more detailed but more important part than the configuration of Fig. 4, and which is omitted for a typical additional configuration, .

In this case, the detection unit 141 has two diodes connected in parallel to each other in opposite directions to two terminals divided at the input end, the forward end of the forward diode is connected to the output end, and the reverse end of the reverse diode is connected to the ground end. And a diode detection unit provided between the output terminal and the ground terminal in parallel with each other. The signal Vs is obtained by demodulating the signal propagation included in the external radio wave of the UHF band through the rectification.

The demodulated signal is input to the main input terminal of the A / D conversion unit 143 through a DC (DC) block 142 formed in a capacitor shape installed in series on the input / output path.

The A / D converter 143 receives the signal input to the main input terminal of the comparator and the reference signal of the reference input terminal, and outputs the low-frequency band baseband signal Vd, which is the original wakeup signal band, to the output terminal do.

The wakeup control unit 145 receives the baseband signal Vd and removes a noise component from the baseband signal waveform and converts it into a form suitable for control. The wakeup control unit 145 removes noise from the baseband signal waveform, Mixed baseband signals, ie, ineffective signals mixed into an external signal coming into the receiving antenna due to interference, are also removed. That is, the interrupt signal generated using only the wake-up signal of the reader suitable for the tag having the high-frequency interrupt logic circuit 140 of the present invention is sent to a portion requiring activation, and therefore, the tag due to noise or an invalid baseband signal It prevents unnecessary startup and operation of the microprocessor.

In this embodiment, the wakeup control unit 145 includes a data input unit 1451, a signal rectifying unit 1453, a low-pass filter 1455, and an on-off signal control unit 1457 in order from the input end to the output end, The output terminal is connected to an unillustrated interrupt control unit of the microprocessor as shown in FIG.

The data input unit 1451 includes a capacitor provided on an input / output path, and a resistor provided between a rear end of the capacitor and the ground.

The signal rectifying unit 1453 includes a diode installed in a forward direction on an input / output path and a diode installed in a reverse direction between a diode front end and a ground.

The low-pass filter 1455 may be provided by providing a capacitor between the ground and the front end of the input / output path, and providing a resistance between the ground and the rear end of the input / output path in parallel.

The on / off signal control unit 1457 includes a field effect transistor (FET) type switch, and has a ground at the input terminal of the FET, a front end on the input / output path to the switching signal terminal of the FET, .

The signal input section 1451, the signal rectifying section 1453, and the low-pass filter 1455 may be regarded as a kind of half-wave voltage rectifying circuit that is modified when viewed as a whole, Current flows through the diode on the input / output path in the signal rectifying part while the capacitor of the input part is charged, and then the capacitor of the low-pass filter is charged and the positive voltage is applied to the OFF signal control part or the front end of the switching signal control part And when the voltage is applied to the switching signal terminal of the on-off signal control unit and the voltage of the FET of the on-off signal control unit 1457 exceeds a predetermined voltage, a current flows or a voltage is applied to the output terminal.

According to such a circuit configuration, even if a high frequency component or a noise component is input at the input terminal, the influence of such a signal can be neglected at the output terminal and the influence of the baseband signal related to wake- The pulse or DC component is then transmitted to the microprocessor as an interrupt signal to activate.

As a result, the RF interrupt logic circuit of the present invention can detect a component of noise or mixed radio waves still mixed in the baseband signal obtained through the detection section or the A / D conversion section in the prior art, The RFID tag is operated when it is not necessary to perform an operation and to operate the second band RFID tag to prevent the data transmission from being caused thereby saving power energy in the tag, It is possible to increase the number of cycles and to prevent a decrease in the usage rate such as the suspension of the vehicle for replacement.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. That is, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

111: receiving antenna 120: charging circuit
130: first band RFID tag unit 140: RF interrupt logic circuit
141: Detector section 143: Analog /
145: wake-up control unit 1451:
1453: Signal rectification section 1455: Low-pass filter
1457: ON / OFF signal control unit 150: Microprocessor
155: sensor 157: clock
170: second band RFID tag unit

Claims (4)

  1. delete
  2. An RF interrupt logic circuit having a detection unit and an analog / digital conversion unit and outputting an interrupt signal using a wakeup signal included in an input external signal,
    The external signal is a signal having a UHF band frequency,
    A wake-up control unit for receiving a baseband signal output from the input terminal through the detection unit and the analog-to-digital conversion unit, and outputting an interrupt signal to the interruption control unit of the output-side element, Further,
    The wake-up control unit includes a data input unit, a signal rectifying unit, a low-pass filter unit, and an on-off signal control unit that are sequentially installed on an input / output path from the input end to the output end,
    Wherein the data input unit includes a first capacitor provided on the input / output path, and a first resistor between a rear end of the first capacitor and the ground,
    Wherein the signal rectifying unit includes a first diode disposed in a forward direction on the input / output path, and a second diode disposed in a reverse direction between a front end of the first diode and a ground,
    Wherein the low-pass filter unit includes a second capacitor between the ground and the front end on the input / output path, and a second resistor between the rear end of the input / output path and the ground,
    Wherein the on / off signal control unit comprises a transistor type switch and connects the input terminal of the transistor to the ground, the switching signal terminal to the front end on the input / output path, and the output terminal of the transistor to the output terminal on the input / output path. UHF RF interrupt logic circuit.
  3. 3. The method of claim 2,
    The detection section has two diodes connected in parallel to each other in opposite directions to two terminals divided at the input end of the detection section, the forward end of the forward diode is connected to the output terminal of the detection section and the rear end of the reverse diode is connected to the ground terminal. And a diode detection unit configured to be installed between the output terminal of the detection unit and the ground terminal while the resistors are parallel to each other,
    A DC (DC) block of a second capacitor type is connected in series to the output of the detection unit,
    The analog / digital (A / D) converter has a comparator structure. The output terminal of the DC block is connected to a main input terminal of the comparator. The analog / digital converter receives a reference signal of a reference input terminal of the comparator, And outputting a signal to the RFID UHF RF interrupt logic circuit.
  4. 3. The method of claim 2,
    As the external signal, a signal having a UHF band frequency of 900 megahertz is targeted,
    The interrupt signal output from the output terminal of the wake-up control unit is used for waking up the RFID active tag unit capable of transmitting a signal in the 2.4 GHz UHF band by activating the built-in microprocessor in the dual band RFID active tag for railway car management The RFID UHF RF interrupt logic circuit.
KR1020150011530A 2015-01-23 2015-01-23 Rfid uhf rf interrupt logic circuit KR101584953B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10089567B2 (en) 2016-12-15 2018-10-02 At&T Intellectual Property I, L.P. Method and apparatus for providing a communications service using a low powered radio tag

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100869776B1 (en) * 2007-06-15 2008-11-21 아시아나아이디티 주식회사 Power saving active tag and reader including the capability of ordinary wake up and of transmission to distance

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100869776B1 (en) * 2007-06-15 2008-11-21 아시아나아이디티 주식회사 Power saving active tag and reader including the capability of ordinary wake up and of transmission to distance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10089567B2 (en) 2016-12-15 2018-10-02 At&T Intellectual Property I, L.P. Method and apparatus for providing a communications service using a low powered radio tag
US10360486B2 (en) 2016-12-15 2019-07-23 At&T Intellectual Property I, L.P. Method and apparatus for providing a communications service using a low powered radio tag

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