KR20030055708A - RF Transceiver for Preventing loss and burglar - Google Patents

Abstract

PURPOSE: A RF transceiver apparatus for loss and robbery prevention is provided, which prevents loss and robbery of an important belonging in advance by outputting an alarm. CONSTITUTION: According to the RF transceiver apparatus performing RF communication using a communication frequency in a specific band, a transmitter(100,200,300) is given with a specific discrimination code and transmits a frequency signal corresponding to the discrimination code periodically with a communication frequency in a specific band having a fixed range communication distance. And a receiver(400) is connected to the transmitter wirelessly, and sets a communication channel with the transmitter according to operation state of a switching device, and receives the frequency signal transmitted from the transmitter after applying a data input signal and then converts it into code data corresponding to the frequency signal and stores it in a memory, and converts the frequency signal transmitted from the transmitter thereafter into code data and compares it with the code data stored in the memory, and generates an alarm when the received code data does not coincide with the previously stored code data or the code data is not received from the transmitter.

Description

RF Transceiver for Preventing loss and burglar}

The present invention relates to an RF transceiver for preventing loss and theft, and more particularly, an RF transmitter is mounted on important items (eg, a bag, a mobile terminal, a wallet, etc.), and a user carries a radio frequency transmitted from the RF transmitter. By detecting through the RF receiver, when the RF transmitter and the RF receiver are separated by a certain distance (for example, 3 to 10m) and the communication between the RF transmission and reception periods is not performed, an alarm sound is output to prevent the loss and theft of important belongings in advance. It relates to an RF transceiver for preventing loss and theft.

In recent years, the use of expensive products such as mobile terminals (eg, mobile phones, PDAs), electronic notebooks, portable MP3 players, and the like, has been increasing for a comfortable life, convenience, and quick information acquisition. In the case of possessing all of these important belongings, it is very cumbersome to find out whether the individual owns the products because the number of items to be managed by the individual is too large, and the belongings are often lost due to the carelessness of the user. In addition, theft of personal belongings such as bags and wallets frequently occurs due to congestion in public places where public transportation or many crowds are crowded.

Accordingly, various products are known to prevent the loss or theft of such important belongings in advance. For example, a mobile phone anti-theft system for a wireless public telephone using a mobile phone is disclosed in Japanese Patent Application Laid-Open No. 1998-67857, and an alarm device for a mobile communication terminal using an infrared sensor is disclosed in Japanese Patent Application Laid-Open No. 2001-11581. It is. However, since the former technology uses a wireless public telephone, it does not work in a place without the wireless public telephone, and the latter technology uses infrared rays, so it does not work in a location where there is no obstacle or straightness. There is a problem that can be known only when a considerable distance falls.

In addition, loss prevention and theft prevention measures seek to prevent the loss of personal belongings or personal accidents are disclosed in the Korean Utility Model Application No. 1983-5197 and the Korean Utility Model Application No. 1984-12296. These technologies consist of an electrical line through which current can flow through the belongings, which are connected to the user's separate alarm and electrical wiring. However, these technologies are not universal because electrical devices must be installed in advance for the belongings to be prevented from theft, and even if they are installed in most belongings, there is a problem that they must be combined with a very complicated wiring structure with the alarm device.

In addition, all of the above-described techniques have a common problem that it is difficult to be carried by the user because of the large volume and weight because of the complicated circuit configuration and external configuration.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, the first object of the present invention is to mount the RF transmitter on the important belongings (eg, bag, mobile terminal, wallet, etc.), RF transmitter By detecting the radio frequency transmitted by the user through an RF receiver carried by the user, if the RF transmitter and the RF receiver are separated by a certain distance (for example, 3 to 10m) or more and the communication of the RF transmission / reception period is not performed, an alarm sound is outputted. The present invention provides an RF transceiver for preventing loss and theft that can be prevented in advance.

It is a second object of the present invention to provide an RF transceiver for preventing loss and theft that is easy to carry and install by minimizing volume and weight by implementing an RF transceiver through a simple circuit configuration.

A third object of the present invention is to provide an RF transmission / reception apparatus for preventing loss and theft, which can simplify the configuration of a device by implementing a plurality of communication channels (for example, three channels) using predetermined switches (for example, two). There is.

1 is a state diagram used in the RF transmission and reception apparatus according to the present invention,

2 is a block diagram showing an internal configuration of an RF transceiver according to the present invention;

3 is an exemplary circuit diagram of a transmitter according to the present invention;

4 and 5 are exemplary circuit diagrams of a receiver according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

100, 200, 300: Transmitter 400: Receiver

150, 250, 350: key input

160, 260, 360: transmitter_power supply

170, 270, 370: transmitter_data input unit

180, 280, 380: Transceiver ICs 190, 290, 390: Oscillator circuit section

510: receiver_power supply 520: reset circuit

530: channel switch unit 540: receiver_data input unit

550: detection circuit portion 560: amplification circuit portion

570: differential amplifier 580: CPU

590: memory unit 595: alarm generating unit

In order to achieve the above object, the present invention provides an RF transceiver for performing RF communication using a communication frequency of a specific band, and receives a specific identification code and periodically schedules a frequency signal corresponding to the identification code with an operation start. A transmitter for transmitting at a communication frequency of a specific band having a communication range of a range; And a wireless connection with the transmitter, establishes a communication channel with the transmitter according to the operation state of the switching element, applies a data input signal, receives a frequency signal transmitted from the transmitter, and converts it into code data corresponding to the frequency signal. And store it in memory, and convert the frequency signal after it is transmitted from the transmitter into code data and compare it with the code data stored in the memory.The received code data does not match the pre-stored code data or code data is not received from the transmitter. Otherwise it comprises a receiver for generating an alarm.

In addition, the transmitter of the present invention includes a key input unit for generating a key signal for starting the operation; A power supply for supplying power for the operation of the transmitter; A data input unit for inputting an identification code of the transmitter; Code signal corresponding to the identification code connected to the key input unit, the power supply unit, and the data input unit, operated by a power source applied from the power supply unit, receiving an identification code applied from the data input unit, and receiving the identification code from the key input unit. Transceiver IC to send to; And an oscillator circuit, which is connected to the transceiver IC, generates a frequency signal corresponding to a code signal transmitted from the transceiver IC and transmits the signal at a communication frequency of a specific band through a transmission antenna.

In addition, the receiver of the present invention includes a power supply for supplying power for operation; A reset circuit section for resetting the receiver when the power is initially turned on or when the power is turned off; A channel switch unit for setting the number of communication channels in accordance with the operating state of the switching element; A data input unit for generating a key signal for inputting data corresponding to an identification code of the transmitter by using a contact switching element; A detection circuit unit connected to a receiving antenna and detecting an original signal wave by filtering only a frequency of a specific band from a frequency signal of a transmitter received and applied by the receiving antenna; An amplification circuit portion connected to the detection circuit portion and amplifying the signal wave filtered by the detection circuit portion; A differential amplifier unit connected to the amplifying circuit unit and configured to proportionally amplify a signal input from each channel through the amplifying circuit unit to a predetermined level to recognize the output signal as specific data; Connected to the power supply unit, reset circuit unit, channel switch unit, data input unit, amplification circuit unit and differential amplifier unit, the operation is started by the power applied from the power supply unit, the channel set by the channel switch unit is set, and the data input unit Instructs to receive and store the data applied through the differential amplifier unit by the data input signal applied from the receiver, and receives the amplified demodulated code data from the amplifying circuit unit and compares them with the stored identification codes or codes data from the transmitter. A CPU that controls to generate an alarm if is not input; A memory unit connected to the CPU and storing identification code data applied from the CPU, and transferring the corresponding data to the CPU according to an extraction command of the CPU; And an alarm generation unit connected to the CPU and outputting an alarm sound by a driving signal applied from the CPU.

Hereinafter, a preferred embodiment of an RF transceiver for preventing loss and theft according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a state diagram of use of the RF transceiver according to the present invention.

The user attaches or mounts the transmitters 100, 200, and 300 to important belongings (eg, a mobile phone, a bag, a wallet, etc.), and the operation buttons 130, 230, and 330 implemented in the transmitters 100, 200, and 300. ) To operate the transmitters 100, 200, 300. The receiver 400 is carried by a user in a pocket or key ring, and receives a radio frequency transmitted from the transmitters 100, 200, and 300. Although only three transmitters are shown in FIG. 1, this is illustrated for illustrative purposes, and the number of transmitters may be freely increased or decreased.

Each transmitter 100, 200, 300 has the same configuration and function, and a transmitter antenna 110, 210, 310 for transmitting a communication frequency of each transmitter 100, 200, 300, and a transmitter connected to belongings Coupling grooves 120, 220, and 320, and transmitter_operation buttons 130, 230, and 330 for generating a key signal for starting the operation of the transmitter. In addition, the coupling groove (120, 220, 320) may include a connecting ring 240 for hooking the transmitter to the belongings or knots.

Receiver 400 is a receiving antenna 410 for receiving a communication frequency transmitted from each of the transmitters (100, 200, 300), receiver_operation button for generating a key signal for starting the operation of the receiver 400 420, the receiver 400 is configured to include a coupling groove 430 and a connecting ring 440 for connecting to a specific position (for example, belt, key ring, etc.).

2 is a block diagram showing the internal configuration of the RF transceiver according to the present invention, each transmitter (100, 200, 300) is a key input unit (150, 160, 170), transmitter_ power supply unit (160, 260, 360) ), Transmitter_data inputs 170, 270, 370, transceiver ICs 180, 280, 380, oscillator circuits 190, 290, 390, and receive antennas 195, 295, 395. The receiver 400 includes a receiver_power supply unit 510, a reset circuit unit 520, a channel switch unit 530, a receiver_data input unit 540, a CPU 550, a memory unit 560, and a reception antenna ( 565, a detection circuit unit 570, an amplifier circuit unit 580, a differential amplifier unit 590, and an alarm generating unit 595.

Since the configuration and function of each transmitter 100, 200, 300 are all the same, only one transmitter (eg, 100) will be described.

The key input unit 150 generates a key signal for initiating the operation of the transmitter 100. The transmitter_power supply unit 160 serves to supply power required for the operation of the transmitter 100. In the present invention, two lithium batteries (3V each) which are small and can be used for a long time are used.

The transmitter_data input unit 170 inputs an identification code of the transmitter 100. Here, the identification code of each transmitter is the same and consists of 8 bits of barcode form. The identification code of each transmitter is preferably set at the time of manufacture and released.

The transceiver IC 180 is connected to the key input unit 150, the transmitter_power supply unit 160, and the transmitter_data input unit 170, and is operated by a power applied from the transmitter_power supply unit 160. It receives an identification code applied from the data input unit 170 and transmits a code signal corresponding to the identification code by a key signal (operation start signal) applied from the key input unit 150. The transceiver IC 180 includes an address input terminal, and the address division code in the present invention is 10 ³ (ON, OFF, OPEN).

The oscillator circuit 190 is connected to the transceiver IC 180, and generates a frequency corresponding to a code signal transmitted from the transceiver IC 180 to transmit to the outside through the transmitting antenna 195. The oscillator circuit 190 includes a trimmer, so that a transmission frequency corresponding to each transmitter (eg, 300M to 400MHz) can be varied and transmitted. Each transmitter may have the same identification code but different communication frequencies to prevent interference with each other.

The receiver_power supply unit 510 supplies power required for the operation of the receiver 400. The reset circuit unit 520 resets the receiver to prevent malfunction of the receiver when the power is initially turned on or when the power is turned off.

The channel switch unit 530 is for setting the number of channels to be received, and sets the number of channels through the on / off setting of the jumper. For example, if jumper 1 is on and jumper 2 is off, one channel is set. If jumper 1 is off and jumper 2 is on, two channels are set. Jumper 1 is on and jumper 2 is on. Is set. When using three transmitters as in the present invention, jumper 1 is set to ON and jumper 2 is set to ON. Although the setting of the channel switch unit 530 is preferably set at the time of manufacture and released, the user can arbitrarily set it before use.

The receiver_data input unit 540 generates a key signal for inputting data corresponding to an identification code of a transmitter, and inputs data (ie, an identification code) using a contact switching element (pushbutton). Let's do it. For example, when the transmitter is kept in the ON state and the push button of the receiver_data input unit 540 is pressed for a predetermined time (for example, 1 second), an identification code transmitted from the transmitter is input.

The detection circuit unit 550 is connected to the receiving antenna 545, and serves to detect the original signal wave by filtering only frequencies of a specific band from a frequency signal received and applied by the receiving antenna 545. . The amplifying circuit unit 560 is connected to the detection circuit unit and serves to amplify the signal wave filtered by the detection circuit unit 550. The differential amplifier unit 570 is connected to the amplifying circuit unit 560, and proportionally amplifies a signal input from each channel through the amplifying circuit unit 560 to a predetermined level to support the recognition of the output signal as data. .

The CPU 550 is connected to the receiver_power supply 510, the reset circuit 520, the channel switch 530, the receiver_data input 540, the amplification circuit 560, and the differential amplifier 570. The operation is started by the power applied from the receiver power supply unit 510, the channel set by the channel switch unit 530 is set, and the differential amplifier is applied by the data input signal applied from the receiver data input unit 540. Receives the data (that is, the identification code of the transmitter) applied through the unit 570 instructs to store in the memory unit 560, the amplified circuit unit 560 receives the amplified demodulated code data to receive the memory unit 560 Compared with the identification code stored in the IDC, it controls to generate an alarm when the two data do not match or the code data is not input.

The memory unit 590 is interconnected with the CPU 580, stores identification code data applied from the CPU 580, and transfers the corresponding data to the CPU 590 according to an extraction command of the CPU 580. Do this.

The alarm generating unit 595 is connected to the CPU 580, and outputs an alarm sound by a driving signal applied from the CPU 580. In the present invention, a pazo buzzer is used. In addition, by setting and outputting different alarm sounds for each transmitter, it is possible to implement to be able to identify the type of belongings lost or stolen by the alarm sound. For example, the length of the alarm sound may be set differently or the number of times of output of the alarm sound may be set differently. Thus, the user can hear the alarm and immediately know which transmitter has been lost or stolen.

The transmitter of the present invention may adopt a method of transmitting frequencies intermittently to prevent waste of power due to continuous frequency transmission. For example, the communication may be performed by transmitting a frequency for 1 second and repeating a process of waiting for 2 seconds.

3 is an exemplary circuit diagram of a transmitter according to the present invention, and FIGS. 4 and 5 are exemplary circuit diagrams of a receiver according to the present invention. 4 is an exemplary circuit diagram of the detection circuit unit 550, the amplifying circuit unit 560 and the differential amplifier unit 570 of the receiver component, Figure 5 is a reset circuit unit 520, channel switch unit 530, receiver of the receiver component _ An exemplary circuit diagram of the data input unit 540, the CPU 580, the memory unit 590, and the alarm generator 595. The circuits for the respective components shown in FIGS. 3 to 5 are merely exemplary and may be variously modified. In addition, since description of the circuit of each component is easily understood by those skilled in the art, detailed description is omitted.

Hereinafter, the operation relationship of the RF transceiver for preventing loss and theft according to the present invention will be described in more detail with reference to the accompanying drawings.

Prior to the operation of the RF transceiver, the transmitter has three transmitters, and the number of channels of the receiver is set to three (for example, jumper 1 is set to ON and jumper 2 is set to ON), and a communication frequency and an identification code are assigned to each transmitter. Assume that Here, the identification code (for example, 8 bits) of each transmitter is the same and the communication frequency (any band of 300M to 400MHz) is set differently.

First, a user presses an operation button of each transmitter and presses a data input portion of the receiver for a predetermined time (for example, one second) to store an identification code of each transmitter in a memory. As soon as operation of the transmitter is started, the transmitter starts to transmit its identification code at the set communication frequency. In this case, the CPU controls the data input signal of the receiver_data input unit to receive the data input through the differential amplifier unit and store the data in the memory.

As soon as the operation is started, the transmitter applies a data signal corresponding to the identification code of the transmitter from the transceiver IC to the oscillator circuit unit, and the oscillator circuit unit generates a radio frequency corresponding to the data signal applied from the transceiver IC and is generated through the antenna. Periodically transmit radio frequency.

The detection circuit unit of the receiver detects a signal wave that filters only a specific frequency band among the received radio frequencies and transmits the signal wave to the amplification circuit unit, and the amplification circuit unit amplifies the transmitted signal wave and delivers it to the CPU. The CPU receives data (ie, identification code data of each transmitter) applied from the amplifying circuit unit and compares the code data pre-stored in the memory unit. As a result of the comparison, if the received code data and the previously stored code data do not match or there is no code data received for a predetermined time, the alarm buzzer generates a warning sound. Since the communication frequency transmitted by the transmitter of the present invention is only within a certain range (for example, 3 to 10 m), the communication frequency of the transmitter does not reach the receiver when the distance between the transmitter and the receiver is outside the allowable range. Therefore, the CPU of the receiver detects the presence or absence of code data corresponding to the communication frequency applied from each transmitter at regular intervals and generates an alarm sound when the corresponding code data is not detected. In addition, since the received code data is compared by the CPU with code data previously stored in the memory unit, the CPU controls to generate an alarm sound even if the two code data do not match. On the other hand, when the received code data and the code data stored in the memory unit coincide with each other, the transmitter and the receiver are within a predetermined range, so that the alarm is not generated.

In addition, the RF transmitting and receiving device of the present invention can be used for preventing the loss of animals and animal protection by hanging the transmitter on the child or animal.

The above description is only for explaining one embodiment, and the present invention is not limited to the above-described embodiment and can be variously changed within the scope of the appended claims. For example, the shape and structure of each component specifically shown in the embodiments of the present invention may be modified.

As described above, according to the RF transmission / reception apparatus for preventing loss and theft according to the present invention, an RF transmitter is mounted on important items (eg, a bag, a mobile terminal, a wallet, etc.), and a user carries a radio frequency transmitted from the RF transmitter. By detecting through one RF receiver, when the RF transmitter and the RF receiver are separated by a certain distance (for example, 3 to 10 m) and the communication between the RF transmission and reception periods is not performed, an alarm sound is output to prevent the loss and theft of important belongings in advance. It has an effect.

Claims (6)

An RF transceiver for performing RF communication using a communication frequency of a specific band, A transmitter that receives a specific identification code and periodically transmits a frequency signal corresponding to the identification code at a communication frequency of a specific band having a communication range of a predetermined range with start of operation; A code corresponding to a frequency signal connected to the transmitter wirelessly, establishing a communication channel with the transmitter according to an operating state of a switching element, applying a data input signal, and receiving the frequency signal transmitted from the transmitter After converting the data into a memory and storing in the memory, the frequency signal after the transmission from the transmitter is converted into code data and compared with the code data stored in the memory, the received code data and previously stored code data does not match or Loss and theft prevention RF transceiver characterized in that it comprises a receiver for generating an alarm if the code data is not received from the transmitter. The method of claim 1, Equipped with a plurality of transmitters with the same identification code and different communication frequencies, attached and mounted on the belongings, And the receiver sets a communication channel corresponding to the number of transmitters, and receives communication frequencies of specific bands transmitted from the plurality of transmitters through the communication channels. The method of claim 1 or 2, wherein the transmitter A key input unit for generating a key signal for starting the operation; A power supply unit supplying power required for operation of the transmitter; A data input unit for inputting an identification code of the transmitter; It is connected to the key input unit, the power supply unit, and the data input unit, and is operated by a power source applied from the power supply unit, receives an identification code applied from the data input unit, and receives an identification code by a key signal applied from the key input unit. A transceiver IC transmitting a corresponding code signal; And Loss and theft, characterized in that the oscillator circuit is connected to the transceiver IC, and generates a frequency signal corresponding to the code signal transmitted from the transceiver IC to transmit at a communication frequency of a specific band through a transmission antenna Preventive RF transceiver. The receiver of claim 1 or 2, wherein the receiver is A power supply unit supplying power required for operation; A reset circuit unit for resetting the receiver upon initial power-up or when the power is turned off; A channel switch unit for setting the number of communication channels according to the operating state of the switching element; A data input unit for generating a key signal for inputting data corresponding to the identification code of the transmitter by using a contact switching element; A detection circuit unit connected to a receiving antenna and detecting an original signal wave by filtering only a frequency of a specific band from a frequency signal of the transmitter received and applied by the receiving antenna; An amplification circuit unit connected to the detection circuit unit and amplifying the signal wave filtered by the detection circuit unit; A differential amplifier unit connected to the amplifying circuit unit and configured to proportionally amplify a signal input from each channel through the amplifying circuit unit to a predetermined level to recognize the output signal as specific data; It is connected to the power supply, reset circuit, channel switch, data input, amplification circuit and differential amplifier, the operation is started by the power applied from the power supply, and the channel set by the channel switch is set. And receiving and storing data applied through the differential amplifier unit according to a data input signal applied from the data input unit, and receiving the amplified demodulated code data from the amplifying circuit unit and comparing the stored identification codes with the stored data. A CPU that controls to generate an alarm if there is a mismatch or no code data is input from the transmitter; A memory unit interconnected with the CPU, storing the identification code data applied from the CPU, and transferring the corresponding data to the CPU according to an extraction command of the CPU; And Loss and theft prevention RF transceiver connected to the CPU, characterized in that it comprises an alarm generator for outputting an alarm sound in response to a drive signal applied from the CPU. The method of claim 4, wherein the switching element of the channel switch unit using a jumper, Loss and theft prevention RF transceiver characterized in that for setting the communication channel according to the on / off setting of the jumper. The method of claim 4, wherein the alarm generator uses a wave buzzer, Loss and theft prevention RF transceiver characterized in that for outputting a different alarm sound for each of the plurality of transmitters.