CN2144837Y

CN2144837Y - Multichannel code wireless alarm device

Info

Publication number: CN2144837Y
Application number: CN 93200396
Authority: CN
Inventors: 曹瑞红
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-14
Filing date: 1993-01-14
Publication date: 1993-10-27
Anticipated expiration: 2003-01-14

Abstract

The utility model relates to a multichannel code wireless alarm device. The utility model is composed of a transmitting device and a receiving device, wherein, the transmitting device comprises a vibrating trigger device, a code generating circuit, an oscillating circuit, a modulation circuit, an amplifying circuit and an antenna; when the transmitting device is vibrated, the vibrating device can switch on the power supplies of the other circuits; the coded pulse can be generated by the code generating circuit and is sent out by the antenna through the modulation and the amplification of the modulation circuit and the amplifying circuit. The receiving device comprises a receiving antenna, a monolithic FM modulator, a pulse amplification circuit, an encode demoding circuit, a control element and a buzzer; the receiving signal can be demodulated, magnified and decoded through the components of the receiving device one after another; the utility model can send out alarm signal after the signal is decoded successfully.

Description

Multichannel code wireless alarm device

The utility model relates to a kind of burglar alarm, especially a kind of multiplex coding wireless alarm, and it is specially adapted to the burglar alarm of display article such as exhibition center, market, hotel.

Known to designer of the present utility model, up to the present, still do not have and the same or analogous multiplex coding wireless alarm of the utility model.

It is little that the purpose of this utility model provides a kind of volume, portable multiplex coding wireless alarm.

The technical solution of the utility model is: a kind of multiplex coding wireless alarm, it is made up of emitter (also can be described as monitoring arrangement) and receiving trap (also can be described as warning device) two parts: emitter is contained in the article or is placed on the article, it is by the vibration flip flop equipment, coding produces circuit, oscillatory circuit, modulation circuit, amplifying circuit and antenna are formed, when the article that (or being placed with) warning device is housed are moved, warning device will inevitably be vibrated, at this moment the power supply of connecting other circuit in this emitter of vibration flip flop equipment wherein (is not moved and under the vibrationless situation at article, these other circuit and power supply always disconnect), making coding produce circuit starts working, produce coded pulse, and modulation circuit is imported in this pulse modulated, input amplifying circuit amplifies again, and modulation and amplification back are launched by miniature dish aerials; Receiving trap (warning device) is placed in user's the pocket or other any user of being convenient to hears the place of chimes of doom, it is by receiving antenna, the monolithic FM demodulator, pulse amplifying circuit, the coding and decoding circuit, control element and hummer are formed, receiving antenna is with the modulation signal input monolithic FM demodulator that receives, demodulate coded pulse, this coded pulse is transfused to pulse amplifying circuit and amplifies then, the input coding decoding circuit is decoded again, if decode successfully, then produce a signal and trigger control element, make the power connection of this control element, thereby hummer is sounded, reach the purpose of warning hummer.

Above said the decoding successfully can be: in decoding circuit, preset coding, if the coding that solves with preset the coding identical, then the expression decode successfully.It can certainly be other predefined situation.

Coding decoder recited above can be the few coding decoder of a kind of peripheral cell, and its output pulse frequency can be determined arbitrarily by the capacitance-resistance value that changes peripheral cell.

For preventing wrong report, the utility model adopts the coded modulation principle, use up-to-date chip, distribute a coding for each transmitter, presetting same coding in the receiver one to one,, just trigger hummer and send alarm sound in case decode successfully with it, the expression article are moved or are taken away by the people, thereby play the burglar alarm effect.

In the utility model, transmitter and receiver is corresponding one by one, and same channel can hold 3 ⁹(19683) road alerting signal and not disturbing mutually.Carrier frequency can adopt 36MHz, meets national regulation, has avoided the overlapping interference that causes with broadcasting FM.

The utlity model has simple in structure, with low cost, volume is little and use advantages such as easy to carry, when being used in show room, market and hotels and other places, monitoring arrangement put within the article or on, warning device is placed in user's the pocket, can do not found by the people, it is reasonable in design, and is easy to utilize.

Below in conjunction with accompanying drawing, further specify concrete structure of the present utility model by narrating principle of the present utility model.In the accompanying drawing:

Fig. 1 is the circuit theory diagrams of the emitter of this multiplex coding wireless alarm.

Fig. 2 is the circuit theory diagrams of the receiving trap of this multiplex coding wireless alarm.

As shown in Figure 1, the higher magnetosensitive hall switch of sensitivity is integrated tripod chip; Relative with a small magnet that hangs and put, when emitter is static, the HALL output low level, the relay disconnection, the other parts of emitter and power supply are in the state of disconnecting; When swing appearred in emitter, then HALL exported high level, the relay adhesive, and supply voltage is added to other circuit part of emitter.Coded portion is made up of dial switch, exclusion and scrambler MC1450264, changes dial switch and just can produce various coding, and the coding frequency is by R _T, C _TAnd R _SDecision.Oscillating part is that the core is formed by BG1, crystal oscillator frequency is 12MHz, having adopted varactor 2CC to make coded modulation uses, the load C 3 of BG1, C4, L3 is tuned on the 36MHz resonance frequency, be output as 36MHz and stablize sine-wave oscillation, BG2 is a buffer stage, prevent that the final stage impedance variation from exerting an influence to oscillator stage, BG3 is the Class C amplifier stage, C8, C9, L8 forms impedance matching network, BG4 is an output amplifier, C10, C11, L11 and antenna constitute and final stage output impedance coupling, and antenna adopts the helical antenna of directly printing (or pan of a steelyard formula antenna), emission efficiency height in miniature printed board, volume is little, modern design.

As shown in Figure 2, receiving trap is mainly by antenna, monolithic FM demodulator TDA7021, pulse amplifying circuit, decoding circuit, control element and hummer are formed, when antenna receives modulation signals, just import TDA7021 and separate the mediation detection, the output of TDM7021 is coded pulse, and be the signal after the detection, BG1 is passed through in this coded pulse, after the pulse amplifying circuit that BG2 and BG3 form amplifies, the Di end of input MC145028, in MC145028, decode, if the coding that presets among the coding of this pulse and the MC145028 is identical, then decode successfully V _TExport a high level pulse, this trigger action controllable silicon makes voltage be added to the 6V hummer, and hummer sends the sound, and the expression article are moved, and reach the purpose of audible alarm.

Claims

1, a kind of multiplex coding wireless alarm, it is made up of emitter and receiving trap two parts, it is characterized in that:

Emitter is by the vibration flip flop equipment, coding produces circuit, oscillatory circuit, modulation circuit, amplifying circuit and antenna and forms, when this emitter is subjected to vibrating, vibration flip flop equipment is wherein connected the power supply of other circuit in this emitter (under vibrationless situation, these other circuit and power supply always disconnect), making coding produce circuit starts working, produce coded pulse, and modulation circuit is imported in this pulse modulated, input amplifying circuit amplifies again, and modulation and amplification back are launched by miniature dish aerials;

Receiving trap is made up of receiving antenna, monolithic FM demodulator, pulse amplifying circuit, coding and decoding circuit, control element and hummer, receiving antenna is with the modulation signal input monolithic FM demodulator that receives, demodulate coded pulse, this coded pulse is transfused to pulse amplifying circuit and amplifies then, the input coding decoding circuit is decoded again, if decode successfully, then produce a signal and trigger control element, make the power connection of this control element, thereby hummer is sounded hummer.

2, according to the described multiplex coding wireless alarm of claim 1, it is characterized in that described coding decoder is the few coding decoder of a kind of peripheral cell, its output pulse frequency can be determined arbitrarily by the capacitance-resistance value that changes peripheral cell.

3,, it is characterized in that the antenna in the emitter is the helical antenna of directly printing in miniature printed board according to the described multiplex coding wireless alarm of claim 1.

According to the described multiplex coding wireless alarm of claim 1, it is characterized in that 4, adopted the higher magnetosensitive hall switch of sensitivity in the vibration flip flop equipment of emitter, it is integrated tripod chip.