KR101209212B1 - Apparatus and method for transmitting Radio Frequency Identification signal - Google Patents

Abstract

The present invention relates to an apparatus and method for transmitting a radio frequency identification (RFID) signal, wherein an RFID for filtering a control signal to prevent an unnecessary frequency from being included in a control signal for controlling an output of an amplifier for amplifying the RFID signal. An apparatus and method for transmitting a signal.
An apparatus for transmitting an RFID signal according to an embodiment of the present invention includes an amplifier for amplifying a radio frequency identification (RFID) signal and a control signal for controlling whether or not to amplify the RFID signal by the amplifier. A control unit for generating digital data, a filter unit for transmitting a control signal in the form of a pyramidal wave or a sine wave to the amplifier according to the digital data, and the control unit operating in accordance with the control signal in the form of a triangular wave or sinusoidal wave. It includes an antenna for transmitting the RFID signal amplified by the amplifier.

Description

Apparatus and method for transmitting Radio Frequency Identification signal

The present invention relates to an apparatus and method for transmitting a radio frequency identification (RFID) signal, and more particularly to a control signal for preventing an unnecessary frequency from being included in a control signal for controlling an output of an amplifier for amplifying an RFID signal. An apparatus and method for transmitting an RFID signal for filtering the data.

In the past, the Internet, which was confined to a specific class, became widespread through the implementation of the Web, which had a great impact on the digital industry as a whole. Internet-based services and content distributed through the Internet have become the yardstick for the digital industry in the 21st century. In addition, as the multimedia of contents has been realized through the high speed of the internet network, mobile phones, PDAs, notebooks, etc., multimedia has become an essential item, not an option.

On the other hand, the concept of computer-based information communication is changing to the concept of ubiquitous. Ubiquitous is a Latin word meaning that it exists anytime, anywhere. It means an information and communication environment where users can freely access the network regardless of the network or computer.

The core of ubiquitous computing is RFID (Radio Frequency Identification), which is a diagram showing a conventional RFID system.

The RFID system includes a transponder 11 that stores unique information, a transceiver (reader or reader) 12 that reads and decrypts functions, a server (host computer) 13, a network 14, and an application program ( It consists of Enterprise Resource Planning (ERP) and Supply Chain Management (SCM).

Transponder 11, commonly called a tag, is composed of an IC (Integrated Circuit) chip and an antenna, and has various shapes and sizes. Transponder 11, which is used to track animals and is implanted under the skin, is as small as a pencil lead of about 2 mm in diameter and has a length of only 1 cm. The main functions of the IC chip are the data storage, memory size (25 bit ~ 512 kb or more), memory type (read only, read and write, write once and read multiple times), type of memory (Electrically Erasable Prices vary depending on Programmable Read-Only Memory (FRAM) and Ferroelectric Random Access Memory (FRAM).

The RFID system may be classified into an inductively coupled method and an electromagnetic wave method according to a wireless access method. The mutual induction method is short-range (within 1m), the electromagnetic wave method is used for medium and long distance RFID, the mutual induction method uses a coil antenna and the electromagnetic wave method uses a high frequency antenna to wirelessly connect to each other.

In mutual induction, the transponder 11 is operated almost manually. That is, all the energy required for the operation of the IC chip of the transponder 11 is supplied by the transceiver 12. Thus, the antenna coil of the transceiver 12 generates a strong magnetic field in the surrounding area. A portion of the emitted magnetic field generates an inductive voltage at the coil antenna of the transponder 11 away from the transceiver 12, rectifies and supplies it with energy for the IC. Since the electromagnetic wave transponder 11 does not receive enough power from the transceiver 12 to drive the IC chip, it may include an additional battery for long-range recognition (active type).

Meanwhile, in order to transmit a signal to a remote transponder 11, the transceiver 12 transmits the signal after amplifying the generated signal. Thus, heat is generated in the process of amplifying the signal. Attenuation and damage to parts may occur.

Therefore, there is a need for the appearance of the invention that can solve the problems caused by the generation of heat accompanying amplifying the signal.

In the present invention, in order to prevent the phenomenon in which the output signal includes the unwanted frequency component generated by the control signal in controlling the output of the amplified signal, the unwanted frequency component caused by the control signal when amplifying the RFID signal by filtering the control signal. The purpose is to minimize the occurrence of the transmission.

In addition, the present invention is to control the amplification duration and amplification period in order to prevent the performance degradation due to excessive heat generation of the amplifier to simplify the system by suppressing the temperature rise and power consumption to reduce the performance of the RFID system have.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an apparatus for transmitting an RFID signal according to an embodiment of the present invention includes an amplifier for amplifying the generated radio frequency identification (RFID) signal, and controls whether or not to amplify the RFID signal by the amplifier A control unit for generating digital data for generating a control signal, a filter unit for transmitting a control signal in the form of a pyramidal wave or a sine wave to the amplifier according to the digital data, and in the form of the triangular or sine wave It includes an antenna for transmitting the RFID signal amplified by the amplifier for operating in accordance with a control signal.

According to an embodiment of the present invention, a method of transmitting an RFID signal includes amplifying a generated Radio Frequency Identification (RFID) signal and generating digital data for generating a control signal for controlling whether the RFID signal is amplified or not. And transmitting a control signal in the form of a pyramidal wave or a sine wave according to the digital data, and transmitting the RFID signal amplified according to the control signal in the form of a triangular wave or sinusoidal wave.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the apparatus and method for transmitting a radio frequency identification (RFID) signal of the present invention as described above, there are one or more of the following effects.

First, there is an advantage in reducing the heat generation and power consumption in the amplifier by controlling the output of the amplified signal.

Second, there is an advantage of reducing the occurrence of unwanted frequencies by filtering the band for the output signal.

1 is a view showing a conventional RFID system.
2 is a block diagram showing an apparatus for transmitting an RFID signal according to an embodiment of the present invention.
3 is a block diagram illustrating a detailed configuration of the filter unit of FIG. 2.
4 and 5 are diagrams showing a control signal according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating an apparatus for transmitting a radio frequency identification (RFID) signal according to an embodiment of the present invention. In the present invention, an apparatus for transmitting an RFID signal (hereinafter, referred to as a signal transmitting apparatus) 200 is an RFID. It can be understood as a transceiver (reader or reader) in the system.

That is, the RFID system may be configured with an RFID tag or a transponder that stores unique information and a transceiver that performs a read and decryption function. The signal transmission apparatus 200 receives data from an RFID tag It can be understood to serve as a transceiver for reading and decrypting received data.

The signal transmission apparatus 200 includes a signal generator 210, a modulator 220, a controller 230, a filter 240, an amplifier 250, an antenna 260, a transmission / reception signal separator 270, and The reception signal demodulator 280 is configured.

The signal generator 210 generates a signal to be transmitted to the RFID tag. The RFID signal generated by the signal generator 210 may be a signal for transmitting specific information to the RFID tag or a signal for requesting information from the RFID tag.

The modulator 220 modulates the signal generated by the signal generator 210.

The signal transmission apparatus 200 and the RFID tag process baseband data by using various digital codings. The wireless signal mainly includes three basic digital modulation schemes, namely, amplitude shift keying (ASK) and FSK. (Frequency shift keying), PSK (Phase shift keying) is used to convert the base signal into a high frequency signal is transmitted.

Therefore, the modulator 220 of the present invention may be understood as modulating a signal generated by one of the above three digital modulation schemes.

The amplifier 250 amplifies the generated RFID signal. Here, the generated RFID signal includes not only a signal generated by the signal generator 210 but also a modulator 220 modulates a signal generated by the signal generator 210.

The controller 230 serves to generate digital data for generation of a control signal for controlling the amplification of the RFID signal by the amplifier 250.

That is, the controller 230 controls the amplifier 250 to control whether the amplifier 250 amplifies or suspends the RFID signal, and the amplifier 250 controls the controller. The control of 230 determines whether to amplify the RFID signal.

Here, controlling whether the amplification unit 250 amplifies the RFID signal may be understood as controlling the amplification duration and amplification period of the amplification unit 250. That is, the controller 230 controls the amplification duration and the amplification period of the amplification unit 250, and the amplification duration and the amplification period may be set by the user. To this end, the signal transmission apparatus 200 may be provided with a timer (not shown) or a clock (not shown) capable of measuring time.

In addition, the amplification duration and the amplification period may be automatically adjusted by the controller 230. For example, when the user sets a specific threshold temperature, the controller 230 may increase the amplification unit 250 so as not to exceed the corresponding temperature. The amplification duration and amplification period can be adjusted in real time so that amplification by) is performed. To this end, the signal transmission device 200 may be provided with a temperature measuring means (not shown).

As the amplification unit 250 does not continuously amplify the RFID signal, but is intermittently performed, power consumed by the amplification unit 250 may be reduced, and heat generation in the amplification unit 250 may be reduced.

On the other hand, in the related art, in order to amplify the RFID signal by the amplification unit intermittently, that is, the generation of the unnecessary frequency was accompanied as the control unit outputs the control signal of the square wave. In other words, a square wave is ideally a rectangular shape, but in fact, various frequencies are synthesized. The square wave includes not only a frequency required for the device to operate but also an unnecessary frequency, that is, an unnecessary frequency.

Here, the unwanted frequency means undesired or unneeded bandwidth or frequency components in a region other than the prescribed bandwidth of the radio waves emitted, which may cause interference or interference to other radio stations, so that the minimum reduction is required. desirable.

In other words, the conventional control unit controls the operation of the amplifying unit to amplify the input signal. In this control process, an unnecessary frequency is generated.

Therefore, a means for removing the unwanted frequency is required. In the present invention, the control unit 230 generates digital data for generating a control signal without generating a square wave, and the digital data is transmitted to the filter unit 240. The control signal is generated. That is, the filter unit 240 generates a control signal according to the digital data received from the controller 230, and the control signal may be in the form of a pyramidal wave or a sine wave.

The filter unit 240 may include a signal magnitude control unit 241 and a D / A converter 242. FIG. 3 is a block diagram illustrating a detailed configuration of the filter unit 240 of FIG.

The signal magnitude control unit 241 transmits the digital data 310 received from the control unit 230 to the D / A converter 242, and outputs a control signal 320 converted into a triangular wave or a sine wave or controls an output magnitude. Play a role. The amplification level of the RFID signal by the amplifier 250 may be changed according to the output size of the control signal 320 by the signal size controller 241. For example, when the size of the control signal 320 is large, the RFID signal is largely amplified, and when the size of the control signal 320 is small, the RFID signal can be amplified small.

The D / A converter 242 converts the digital data received from the signal size control unit 241 into a control signal in the form of a triangular wave or sinusoidal wave and transmits the digital data to the signal size control unit 241.

The digital data for causing the D / A converter 242 to generate triangular or sinusoidal waves may be provided in a read only memory (ROM) or firmware.

When data is provided from the firmware to the D / A converter 242, the signal size control by the signal size control unit 241 can be adjusted to the data value of the D / A converter 242, so the signal size control unit 241 and the D are controlled. The / A converter 242 may be in one configuration.

Referring to FIG. 2 again, the antenna 260 transmits an RFID signal amplified by the amplifier 250 operating according to a control signal in the form of a triangular wave or a sinusoidal wave.

The RFID system may be classified into an inductively coupled method and an electromagnetic wave method according to a wireless access method. The mutual induction method is used at a short range of less than 1 m, and the electromagnetic method is used for medium to long distances.

Here, the mutual induction method uses a coil antenna, and the electromagnetic wave method uses a high frequency antenna for wireless connection, and the mutual induction method of the RFID tag is mostly passive.

In other words, the RFID tag is classified into a passive type that operates by receiving energy from the outside and an active type that operates with its own energy source. The mutual flow type RFID tag receives energy from the outside to operate the provided IC chip. The energy is supplied from the transceiver, that is, the signal transmission apparatus 200 of the present invention.

In order to supply energy to the RFID tag, the antenna 260 of the signal transmission device 200 generates a strong magnetic field in the surrounding area of the provided coil, where a part of the generated magnetic field is separated from the signal transmission device 200. By generating an inductive voltage in the coil antenna of the tag, it is supplied with energy for the IC chip of the RFID tag.

On the other hand, since the RFID tag of the electromagnetic wave type is not supplied with sufficient power for driving the provided IC chip from the signal transmission apparatus 200 may include an additional energy source for long-range recognition, that is, a battery.

As such, the RFID tag may drive an IC chip provided in a passive or active manner, and the signal generated by the signal generator 210 of the signal transmitter 200 may be generated from the antenna coil of the signal transmitter 200. It is received by an energized passive RFID tag and an active RFID tag operating as its own energy source.

As the antenna 260 transmits an RFID signal, the RFID tag receiving the RFID signal transmits data that it has. In this case, the RFID signal transmitted by the antenna 260 may be a signal for transmitting specific information to the RFID tag or a signal for requesting information from the RFID tag, and the RFID tag receiving the RFID signal operates as received information. You can either do this or send the information you are storing.

Information transmitted by the RFID tag may be received through the antenna 260. For this purpose, the antenna 260 preferably simultaneously performs transmission and reception.

The transmission and reception signal separation unit 270 separates a transmission signal and a reception signal. That is, the signal received from the amplifier 250 is regarded as a transmission signal and output through the antenna 260, and the signal received from the antenna 260 is regarded as a received signal and transmitted to the received signal demodulator 280. It is. In other words, in the present invention, the transmission and reception signal separation unit 270 may be understood as performing a role of a circulator.

The received signal demodulator 280 demodulates the received signal. That is, the received signal demodulator 280 recovers the received signal to the original signal, and performs the demodulation process by extracting the modulated wave from the carrier wave.

Since the processing of the demodulated signal is outside the technical scope of the present invention, a detailed description thereof will be omitted.

4 and 5 illustrate control signals according to an embodiment of the present invention. FIG. 4 illustrates that the digital data 410 is converted into a control signal 420 of a triangular wave, and FIG. 5 illustrates the digital data 510. ) Is converted into a sinusoidal control signal 520.

As shown in FIGS. 4 and 5, when the controller 230 generates digital data 410 and 510 that can form a triangular wave or a sinusoidal wave and delivers the digital data to the filter unit 240, the filter unit 240 receives the received data. The analog control signals 420 and 520 are generated using the digital data 410 and 510.

The conversion of the digital data 410 and 510 into the control signals 420 and 520 in the form of a triangular wave or sinusoidal wave may be performed by the D / A converter 242 of the filter unit 240.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

210: signal generator 220: modulator
230: control unit 240: filter unit
250: amplifier 260: antenna
270: transmission and reception signal separation unit 280: reception signal demodulation unit

Claims (6)

An amplifier for amplifying the generated radio frequency identification (RFID) signal;
A controller configured to generate digital data for generation of a control signal for controlling amplification of the RFID signal by the amplifier;
A filter unit for transmitting a control signal in the form of a pyramidal wave or a sine wave to the amplifier according to the digital data; And
An antenna for transmitting the RFID signal amplified by the amplifier for operating in accordance with the control signal of the triangular wave or sinusoidal wave,
The control unit is an apparatus for transmitting an RFID signal for controlling the amplification duration and amplification period by the amplifier. delete The method of claim 1,
And the control unit transmits an RFID signal for adjusting the amplification duration and the amplification period in real time so that the temperature of the amplification unit does not exceed a preset threshold temperature. Amplifying the generated radio frequency identification (RFID) signal;
Generating digital data for generation of a control signal for controlling amplification of the RFID signal;
Transmitting a control signal in the form of a pyramidal wave or a sine wave according to the digital data; And
Transmitting an amplified RFID signal according to the triangular or sinusoidal control signal,
The amplifying the RFID signal includes amplifying the RFID signal by determining a duration and amplification period of the amplification according to the control signal. delete 5. The method of claim 4,
And adjusting the duration of the amplification and the amplification period in real time so that the temperature of the amplifying unit for amplifying the RFID signal does not exceed a preset threshold temperature.

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