CN2514440Y

CN2514440Y - Anti-theft alarm using radio coding

Info

Publication number: CN2514440Y
Application number: CN 01254564
Authority: CN
Inventors: 邬国强
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-11-07
Filing date: 2001-11-07
Publication date: 2002-10-02
Anticipated expiration: 2011-11-07

Abstract

The utility model relates to an anti-theft alarm adopting radio coding, which is used for anti-theft alarm of valuables and is characterized in that the anti-theft alarm comprises a transmitter circuit used for generating radio coding signals, an alarm circuit used for receiving the radio coding signals sent by the transmitter circuit and forming wireless signal connection with the transmitter circuit, wherein, the transmitter comprises an encoder circuit composed of the coding circuit, a radio frequency circuit composed of an inductor, a capacitor and a transistor and connected with the encoder circuit, a power saving control switch circuit composed of an oscillator and connected with the encoder circuit and the radio frequency circuit, the alarm circuit comprises a radio coding signal receiver circuit composed of a super regenerative detector, an alarm distance control circuit composed of an amplifying circuit, a decoder connected with the radio coding signal receiver circuit and the alarm distance control circuit, and a decoder connected with the decoder An acousto-optic generation circuit.

Description

Adopt the burglar alarm of radio coding

Technical field

The utility model relates to a kind of burglar alarm, relate in particular to a kind of can identification and measure miniature emitting head coding and and alarm between the burglar alarm of employing radio coding of alarm of distance.

Background technology

Prior art has following several for the valuables burglar alarm: a kind ofly be, adopt photoelectric tube to detect the wallet burglar alarm of the bright dark situation in wallet position, this wallet burglar alarm advantage advantage is by day or under the brighter situation of light certain effect to be arranged, its shortcoming is, at night or in the compartment that the passenger crowds, this wallet alarm just loses original function; Also have a kind ofly to be, metal induction alarm device, its advantage is that sensitivity is better, still, because this alarm is to the responsive distance of metal limited (only being 5mm) and be subjected to the influence of other metal easily, so the mistake that can produce wrong report or fail to report.

Summary of the invention

The purpose of this utility model is to provide a kind of burglar alarm of improved employing radio coding, and it has the resolution capability to the cryptography of posting a letter, can not only under any environmental baseline, use, and, the mistake generation that can eliminate wrong report or fail to report.

The purpose of this utility model is achieved in that

A kind of burglar alarm that adopts radio coding is used for the valuables burglar alarm being characterized in this burglar alarm is made up of two parts: a transmitter circuit, and this transmitter circuit is used to produce radio coding signal; One alarm circuit, this alarm is accepted the radio coding signal that transmitter circuit is sent, and alarm forms being connected of energy wireless signal by the acceptance of wireless signal with transmitter circuit.

In the burglar alarm of above-mentioned employing radio coding, wherein, described transmitter comprises, an encoder circuit of being made up of coding circuit; The one radio frequency circuit of forming by inductance, electric capacity and transistor, this radio frequency circuit is connected with encoder circuit; The one power-saving control on-off circuit of being made up of oscillator, this power-saving control on-off circuit are connected with the radio frequency circuit with encoder circuit and give their working signals.

In the burglar alarm of above-mentioned employing radio coding, wherein, described alarm circuit comprises, a radio coding signal acceptor circuit of being made up of superregenerative detector; The one alarm distance control circuit of forming by amplifying circuit; One demoder that is connected with the alarm distance control circuit with the radio coding signal acceptor circuit, this demoder is made up of decoding circuit; One acousto-optic that is connected with demoder produces circuit.

The utility model adopts the burglar alarm of radio coding, owing to adopted above-mentioned technical scheme, makes it to compare with the prior art alarm, has following advantage and good effect:

1. the utility model is because after adopting the technique scheme circuit, the scope of application has enlarged a lot, applicable to using under multiple environment, place, position and the condition;

2. the utility model takes place thereby eliminate the mistake of reporting by mistake or failing to report owing to the resolution capability that has the cryptography of posting a letter;

3. the utility model can be placed on and make the wallet burglar alarm in the handbag because therefore the raising of the accuracy of the raising of anti-interference and warning goes for multiple occasion, can be contained in and make antitheft door on the door;

4. the utility model is owing to have the coding of extremely low power consumption and 1.6 ten thousand kinds and begin to the alarm distance more than the 10m from 10cm, thereby the purposes of alarm is improved greatly.

Description of drawings

Embodiment by the following burglar alarm that the utility model is adopted radio coding can further understand the purpose of this utility model, specific structural features and advantage in conjunction with the description of its accompanying drawing.Wherein, accompanying drawing is:

Fig. 1 is the integrated circuit block diagram according to the burglar alarm of the employing radio coding that the utility model proposes;

Fig. 2 is the electrical schematic diagram that the utility model adopts radio coding transmitter portion in the burglar alarm of radio coding;

Fig. 3 is the electrical schematic diagram that the utility model adopts the part of reporting to the police in the burglar alarm of radio coding.

Embodiment

The utility model alarm is made up of two parts, one for producing the transmitter of radio coding signal, another is the alarm that can accept this radio coding signal, alarm will be received a radio coding signal in effective chosen distance, after accepting decoding, to make the decoding output terminal produce a low level, this will make the generation sound and light of alarm be in state on duty, export without any signal, when a sensor valuables being housed leaving original position, at this moment will produce a high level at alarm decoding output terminal, sound and light of alarm is an alarm condition with state exchange on duty like this, produce the 90dB chimes of doom, have light emitting diode to produce flash signal.

See also shown in Figure 1ly, this is the integrated circuit block diagram that the utility model adopts the burglar alarm of radio coding.The utility model burglar alarm is used for the valuables burglar alarm, and it is made up of a transmitter circuit 10 and an alarm circuit 20.Wherein, this transmitter circuit 10 is used to produce radio coding signal, this transmitter can be done very for a short time, and the economic only 200 μ A of power consumption, transmitter circuit 10 comprises three parts, one encoder circuit 11, is connected 1 radio frequency circuit 12 with encoder circuit 11, that be connected with encoder circuit 11 and radio frequency circuit 12 and give the power-saving control on-off circuit 13 of their working signals; This alarm 20 is accepted the radio coding signal that transmitter circuit 10 is sent, alarm 20 forms being connected of energy wireless signal by the acceptance of wireless signal with transmitter circuit 10, alarm circuit 20 comprises four parts, a radio coding signal acceptor circuit 21 and an alarm distance control circuit 22; One produces circuit 24 with acousto-optic that demoder 23, that radio coding signal acceptor circuit 21 is connected with alarm distance control circuit 22 is connected with demoder 23.

Please in conjunction with Fig. 1 referring to shown in Figure 2, Fig. 2 is that to adopt the burglar alarm of radio coding be the electrical schematic diagram of radio coding transmitter portion among Fig. 1 to the utility model.Described transmitter 10 comprises, an encoder circuit 11 of being made up of coding circuit; The one radio frequency circuit of forming by parts such as inductance, electric capacity and transistors 12, this radio frequency circuit 12 is connected with encoder circuit 11; The one power-saving control on-off circuit of being made up of oscillator 13, this power-saving control on-off circuit 13 is connected with radio frequency circuit 12 with encoder circuit 11, and gives

encoder circuit

11 and 12 work orders of radio frequency circuit.

The connection situation of radio coding transmitter 10 part physical circuits is as follows.What produce coded signal in radio coding transmitter 10 is, integrated circuit (IC) chip 1IC1 model is the encoder circuit of N2262,18 pin of encoder circuit N2262 and 9 pin connect VCC and ground respectively, connect geocoding switch and digital coding switch respectively 1～8,10～13.Connect resistance 1R2 between 15,16, determine the clock frequency of encoder circuit N2262 with this, the 14th pin is effective to low level, and as connect a low level at this pin, encoder circuit N2262 is work just, and will export a string coding waveforms signal at the 17th pin this moment; Code switch is to adopt the chip component attachment technique with silk screen the silver slurry to be printed to solidify to form, and forms the make and break contact of logical " 1 " or logical " 0 " respectively; Transmitter also built-in a power-saving control switch 13, this power-saving control switch 13 is by multivibrator that two transistor 1VT2 and 1VT3 formed and form resistance 1R5 and 1R4; The resistance of 1R6 and 1K5 and electric capacity have determined the oscillation frequency of multi-resmator, have also determined the dutycycle of waveform, in this circuit, to produce a burst pulse behind the negative edge, be used for 14 pin of controlled encoder circuit N2262, make its outupt coded signal, the battery consumption is reduced.Inductance 1L2, electric capacity 1C1 and 1C2 and transistor 1VT1 form a higher-order of oscillation, oscillation frequency is at 304MHz, the 17th pin of encoder circuit N2262 is exported a string coding waveforms signal modulation high frequency oscillator, thereby makes transmitter produce the radio coding signal of one group of group.Since encoder circuit N2262 from 1～8,10～13 totally 12 pins can insert " 0 " or " 1 " signal, so present embodiment transmitter 10 will produce 214 kinds of arranging and encodings, i.e. 1.6 ten thousand kinds coding.

Please in conjunction with Fig. 1 referring to shown in Figure 3, Fig. 3 is that to adopt the burglar alarm of radio coding be the electrical schematic diagram of part of reporting to the police among Fig. 1 to the utility model.Described alarm circuit 20 comprises, a radio coding signal acceptor circuit 21 of being made up of superregenerative detector; The one alarm distance control circuit of forming by amplifying circuit 2; One demoder 23 that is connected with alarm distance control circuit 22 with radio coding signal acceptor circuit 21, this demoder 23 are that the decoding circuit of 2IC1N2272 is formed by the integrated circuit (IC) chip model; One acousto-optic that is connected with demoder 23 produces circuit 24.

The connection situation of alarm circuit 20 part physical circuits is as follows.In alarm circuit 20, transistor 2VT1, inductance 2L1,2L2 and 2L3, electric capacity 2C4,2C5,2C1, resistance 2R3,2R1 forms a superregenerative detector, this superregenerative detector is radio coding signal acceptor circuit 21 (see figure 1)s, change the frequency of accepting that electric capacity 2C3 and inductance 2L1 can change radio coding signal acceptor circuit 21, when electric capacity 2C3 be tuned to during 304MHz, radio coding signal from radio coding transmitter 10 will be received by this super wave detector again, the reduction detection goes out the coded signal that is produced by encoder circuit N2262 and enters alarm distance controller 22 by the A point, this alarm distance controller 22 is one and forms negative-feedback amplifier by transistor 2VT2 and formed, negative feedback resistor 2R8,2R9,2R10 adjusts the amplifier feedback quantity by switch 2K2, make it to reach the decoding level threshold values that integrated circuit (IC) chip 2IC1 model is the N2272 decoding circuit, make the decoding circuit N2272 work of decoding normally, the demoder of being made up of 2IC1N2272 connects Vcc and ground respectively at 18 pin and 1 pin, at 1～8 pin, 10～13 pin connect respectively and transmitter 10 corresponding codes switches, 15, connect resistance 2R15 between 16 pin, this resistance is corresponding with resistance 1R2 again, thereby makes decoding circuit N2272 produce one with the identical clock frequency of encoder circuit N2262.This moment is as long as satisfy two kinds of situations, the first, coded signal reaches the coding threshold values of decoding circuit N2272, it two is, encoder circuit N2262 is consistent with the coded signal of decoding circuit N2272, to export a high level at 17 pin of decoding circuit N2272 this moment, high level signal does to isolate paraphase by 9 pin that diode 2VD5 arrives inverter circuit CD4069, from 8 pin output low levels, thereby restrain audible-visual annunciator work, if transmitter 10 is away from alarm, thereby make the coded signal that enters decoding circuit N2272 14 pin not reach the decoding threshold level, decoding circuit N227217 pin will be exported a low level this moment, 9 pin by CD4069 are to the paraphase of 8 pin, to produce 1 high level, thereby make the sound and light alarm drive operation, produce sound and light alarm.

Audible-visual annunciator is that 5 phase inverters of CD4069 are formed by integrated circuit (IC) chip 2IC2 model, 10,11 pin and 12,13 pin group bass oscillators, when this bass produces " 1 " signal, diode 2VD3 is transferred to " 1 " signal on the high audio oscillator of being made up of

1,2 and 3,4, produce the alerting signal of two kinds of signal modulation, thereby this alerting signal goes out and diode 2VD4 light emitting diode by the isolation paraphase driving 2BC1 buzzing of

5,6 again, makes acousto-optic and reports to the police.

In sum, the utility model adopts the burglar alarm of radio coding, because in the resolution capability that has the cryptography of posting a letter, the mistake generation of not only eliminating wrong report or failing to report, and applicable to using under multiple environment, place, position and the condition; Simultaneously,, can be placed on and make the wallet burglar alarm in the handbag, also can be contained in and make antitheft door on the door because the raising of the accuracy of the raising of anti-interference and warning improves the purposes of alarm, therefore, very practical.

Claims

1. burglar alarm that adopts radio coding is used for the valuables burglar alarm being is characterized in that this burglar alarm is made up of two parts:

One transmitter circuit (10), this transmitter circuit (10) is used to produce radio coding signal;

One alarm circuit (20), this alarm (20) is accepted the radio coding signal that transmitter circuit (10) is sent, and alarm (20) forms being connected of energy wireless signal by the acceptance of wireless signal with transmitter circuit (10).

2. the burglar alarm of employing radio coding as claimed in claim is characterized in that: described transmitter (10) comprises, an encoder circuit (11) of being made up of coding circuit; The one radio frequency circuit of forming by inductance, electric capacity and transistor (12), this radio frequency circuit (12) is connected with encoder circuit (11); The one power-saving control on-off circuit of being made up of oscillator (13), this power-saving control on-off circuit (13) are connected with radio frequency circuit (12) with encoder circuit (11) and give their working signals.

3. the burglar alarm of employing radio coding as claimed in claim is characterized in that: described alarm circuit (20) comprises, a radio coding signal acceptor circuit (21) of being made up of superregenerative detector; The one alarm distance control circuit of forming by amplifying circuit (22); One demoder (23) that is connected with alarm distance control circuit (22) with radio coding signal acceptor circuit (21), this demoder (23) is made up of decoding circuit; One acousto-optic that is connected with demoder (23) produces circuit (24).