CN2285919Y - Wireless antirobbing alarm device - Google Patents

Abstract

The utility model discloses an alarming device, comprising a transmitter and a receiver; a time limiting and counting trigger switch circuit, an audio modulation circuit and a double-oscillation transmitting circuit which are connected in sequence are arranged in the transmitter; a double-frequency modulation reception circuit, an audio circuit, a power amplification circuit which are connected in sequence are arranged in the receiver; the alarming device overcomes the defect that the existing alarming device is easy to alarm falsely and triggered falsely with a single-path transmission and reception. The utility model has the advantages of less possibility of false alarms, less possibility of triggering mistakes and small size.

Description

Wireless anti-theft is robbed alarm

The utility model relates to the intrusion alarm device, specifically is meant a kind of wireless anti-theft misfortune alarm.

Alarm is known by people, radioalarm equipment is widely used in places such as family, bank, warehouse especially, radioalarm equipment has generally included transmitter, receiver, is provided with the trigger switch circuit, audio modulating circuit, the vibration radiating circuit that connect successively in the transmitter; Be provided with the FM reception circuit, voicefrequency circuit, the power amplifier that connect successively in the receiver.Trigger switch circuit in the transmitter sends the warning trigger pip, audio modulating circuit is modulated the high-frequency signal of vibration radiating circuit and is transmitted, the signal that the FM reception circuit receiver/transmitter of receiver sends, voicefrequency circuit sends alerting signal by power amplifier.This alarm line construction is simple, can reach the warning effect.But because the interior employing of the transmitter of this alarm is the single channel emission, also adopt single channel to receive in the respective receiver, this obviously alarm is subject to disturb, and can produce false-alarm, all is to adopt single channel to transmit and receive as CN94209281.3, CN93233404.0.The Another reason of the false-alarm that existing radioalarm equipment produces is exactly the easy false triggerings of trigger circuit, and this mainly is to have adopted the single trigger circuit, and promptly single just triggers and reports to the police, so false-alarm and false triggering are the common problems that existing alarm exists.

Task of the present utility model is to overcome the shortcoming that above-mentioned alarm exists, and a kind of difficult generation false-alarm is provided, is difficult for producing the wireless anti-theft misfortune alarm of false triggering.

In order to finish above-mentioned task, the utility model adopts following technological means: the same with above-mentioned alarm, this alarm includes transmitter and receiver, be provided with the trigger switch circuit, audio modulating circuit, the vibration radiating circuit that connect successively in the transmitter, be provided with the FM reception circuit, voicefrequency circuit, the power amplifier that connect successively in the receiver, institute's difference is that the vibration radiating circuit in the transmitter adopts two vibration transmitter units, and the FM reception circuit in the receiver adopts the frequency modulation-frequency modulation receiving element.

Trigger switch circuit in the utility model transmitter has adopted counts the trigger switch circuit in limited time, to reach the purpose that prevents false triggering.

Because the utility model adopts two vibration transmitter units and adopt the frequency modulation-frequency modulation receiving element in receiver in transmitter, make this alarm not disturbed by external signal and the generation false-alarm, count the trigger switch circuit in limited time owing in transmitter, having adopted simultaneously, make this alarm be unlikely the false-alarm that produces false triggering and cause.

Below in conjunction with drawings and Examples, the utility model is described in further detail:

Fig. 1 is the utility model transmitter circuitry theory diagram.

Fig. 2 is the utility model receiver circuit theory diagram.

Fig. 3 is the utility model transmitter circuitry schematic diagram.

Fig. 4 penetrates the machine circuit schematic diagram for the utility model connects.

Please consult Fig. 1, Fig. 2 earlier, be provided with the trigger circuit 11, the audio modulating circuit 12 that connect successively in the transmitter 1, behind audio modulating circuit 12, be connected to the vibration radiating circuit of forming by two-way vibration transmitter unit 131.132 (promptly two vibration transmitter unit) 13.Be provided with in the receiver 2 and connect FM reception circuit 21, voicefrequency circuit 22, the power amplifier of forming by two-way FM reception unit 211.212 (being the frequency modulation-frequency modulation receiving element) 23 successively.

Please consult Fig. 3 again, trigger switch circuit 11 is for counting the trigger switch circuit in limited time, this circuit contains triode VT1, diode VD1 and VD2, counter A1, K switch and controllable silicon VS1, resistance, the on-off circuit that electric capacity constitutes, the emitter one tunnel of VT1 is connected to 14 and 16 pin of counter A1, one the tunnel is connected to capacitor C 3 and resistance R 3 to ground, the base stage of VT1 is connected to K switch and VD2 13 pin to A1 by resistance R 1, capacitor C 1 is connected between the node and ground of R1 and K switch, K switch one termination power positive pole, resistance R 2 and capacitor C 2 are connected between the positive pole and ground of VD2, capacitor C 3 and resistance R 3 are serially connected with between the emitter and ground of VT1, the negative pole of VD1 is connected to 15 pin of resistance R 3 and capacitor C 3 junction sum counter A1, the VD1 positive pole connects 4 pin of counter A1,11 pin of counter A1 are connected to the control utmost point G of controllable silicon VS1, the anodal A of the collector of VT1 and controllable silicon VS1 is connected to positive source, and the negative pole K of VS1 (negative pole K is exactly the positive pole of power supply after the VS1 conducting) is as the positive source of audio modulating circuit 12 and vibration radiating circuit 13.

Audio modulating circuit 12 contains audio manifold block A2, and A2 is connected between the negative pole K and ground of VS1, and its output is connected to vibration radiating circuit 13 by capacitor C 4, and R4 is connected across on the A2.

Vibration radiating circuit 13 is to constitute two vibration transmitter units 131 and 132 by typical LC oscillator, resistance R 5 and capacitor C 5 are serially connected with between the negative pole K and ground of VS1, capacitor C 4 one is connected to resistance R 5 and the contact of capacitor C 5 and the base stage of triode VT2 and VT3, capacitor C 8 and inductance L 2 are connected between the emitter and ground of VT2, variable capacitance C6 and inductance L 1 are connected between the collector of the negative pole K of VS1 and VT2, capacitor C 9 is connected between the collector and emitting antenna Y1 of VT2, also is connected to capacitor C 7 between VT2 emitter and collector; Equally, the annexation of vibration transmitter unit 132 is that capacitor C 12 and inductance L 4 are connected between the emitter and ground of triode VT3, variable capacitance C10 and inductance L 3 are connected between the negative pole K of VT3 collector and VS1, capacitor C 13 is connected between the collector and emitting antenna Y2 of VT3, also is connected to variable capacitance C11 between VT3 emitter and collector.

Please consult shown in Figure 4 again, FM reception circuit 21 in the receiver 2 has adopted frequency modulation-frequency modulation receiving element 211.212, FM reception unit 212 contains FM reception piece A2 ', the 3.7.9.10.13.15.16 pin of A2 ' connects positive source by capacitor C 18.C16.C15.C14.C13 ' .C12 ' .C11 ' respectively, 4 pin, and 5 pin by and the capacitor C 17 and the L2 ' that connect connect positive source, 14 pin .12 pin are by capacitor C 19,2 pin are by capacitor C 20 difference ground connection, 11 pin meet receiving antenna Y1 ', capacitor C 21 is connected to A2 ' 6 and 8 pin, output terminal 1 pin of A2 ' with join with 4 and 5 ends of door piece A3,14 ends of A3 and 7 ends are connected to positive source and ground respectively; Equally, the connection of FM reception unit 211 is consistent with unit 212, just is not described in detail at this, meets controllable silicon VS2 control utmost point G with the output terminal 1 of door A3, the anodal A of VS2 connects positive source, and the negative pole K of VS2 is just as the voicefrequency circuit 22 of back and the power positive end of power amplifier 23 after the VS2 conducting.The voicefrequency circuit 22 of FM reception circuit 21 back and power amplifier 23 all are typical audio frequency and power amplifier, and its annexation sees also Fig. 4, has not also narrated at this.

A1 model in the transmitter is CD4022, and the model of A2 is KD9561, and A1 ' in the receiver and the model of A2 ' are TDA7010T, and the model of A3 is CD4082, and the model of A5 is KD9561, and the model of A6 and A7 is LM386.

The principle of work of this alarm is as follows: when pressing the trigger switch K of transmitter, C1 is recharged, the base stage input high level of triode VT1, the VT1 conducting is by the operating voltage of emitter output for counter A1, counter A1 begins counting, connect three times trigger switch, the 11 pin output high level of counter A1, VS1 connects, thereafter audio modulating circuit 12 and vibration radiating circuit 13 energized, A2, VT2, VT3 work, A2 output audio modulation voltage, VT2, VT3 produces LC self-sustained oscillation, produces two road high-frequency modulation signals, and by C9, C13 delivers to antenna Y1 and Y2 emission respectively.Interval by trigger switch can be provided with arbitrarily, as can being arranged in three seconds, the interval of secondary surpass three seconds then VT1 end, counter A1 returns zero, transmitter does not transmit, alarm is not reported to the police.Must in three seconds, press three times continuously again, since VT1, R1, the time constant of the delay circuit that C1 forms was set in three seconds, and transmitter just sends signal.Certainly, the time can be provided with difference, can effectively prevent false triggering like this, in case find emergency condition, can connect three times in the extremely short time, and transmitter will send signal, alarm equipment alarm.If any the ruffian to utilize be the injured party's acquaintance, and adopt the soft method of advancing to go out firmly, then the injured party can connect three times, this alarm will outwards send alerting signal.

FM reception circuit 21 when receiver 2, be after frequency modulation-frequency modulation receiving element 211 and 212 receives the FM signal of two different frequencies that transmitter 1 sent, export the input end 2 and 3 of high level respectively to AND circuit A3,4 and 5, output terminal 1 output high level is to the control utmost point G of VS2, VS2 conducting, voicefrequency circuit 22 thereafter and power amplifier 23 energized, A5, A6 and A7 work.A5 output alarm audio voltage is also delivered to A6 and OCL power amplifier 23 that A7 forms carries out power amplification, amplify the back and send chimes of doom by Yang Sheng device B, must just can make the output terminal 1 of AND circuit A3 export high level by the while input high level with two road input ends of door piece A3, the frequency of two receptions is corresponding with the frequency of being launched, so receiver has anti-interference good, alarm is difficult for producing false-alarm.Two tunnel transmission frequencies of transmitter can be provided with different frequencies as required, and the frequency that receiver sets is also just corresponding with the frequency of transmitter, disturb to get rid of, and in time report to the police.

Claims (4)

1. a wireless anti-theft is robbed alarm, contain transmitter (1) and receiver (2), be provided with the trigger switch circuit (11), audio modulating circuit (12), the vibration radiating circuit (13) that connect successively in the transmitter (1), be provided with the FM reception circuit (21), voicefrequency circuit (22), the power amplifier (23) that connect successively in the receiver (2), it is characterized in that: the vibration radiating circuit (13) in the transmitter (1) adopts two vibration transmitter units (131.132), and the FM reception circuit (21) in the receiver (2) adopts frequency modulation-frequency modulation receiving element (211.212).

2. alarm as claimed in claim 1, it is characterized in that: said vibration transmitter unit (131) is serially connected with between the negative pole K and ground of VS1 for resistance R 5 and capacitor C 5, capacitor C 4 one is connected to resistance R 5 and the contact of capacitor C 5 and the base stage of triode VT2 and VT3, capacitor C 8 and inductance L 2 are connected between the emitter and ground of VT2, variable capacitance C6 and inductance L 1 are connected between the collector of the negative pole K of VS1 and VT2, capacitor C 9 is connected between the collector and emitting antenna Y1 of VT2, also is connected to capacitor C 7 between VT2 emitter and collector; Equally, the annexation of vibration transmitter unit (132) is that capacitor C 12 and inductance L 4 are connected between the emitter and ground of triode VT3, variable capacitance C10 and inductance L 3 are connected between the negative pole K of VT3 collector and VS1, capacitor C 13 is connected between the collector and emitting antenna Y2 of VT3, also is connected to variable capacitance C11 between VT3 emitter and collector; Said FM reception unit (212) contains FM reception piece A2 ', the 3.7.9.10.13.15.16 pin of A2 ' connects positive source by capacitor C 18.C16.C15.C14.C13 ' .C12 ' .C11 ' respectively, 4 pin, and 5 pin by and the capacitor C 17 and the L2 ' that connect connect positive source, 14 pin .12 pin are by capacitor C 19,2 pin are by capacitor C 20 difference ground connection, 11 pin meet receiving antenna Y1 ', capacitor C 21 is connected to A2 ' 6 and 8 pin, output terminal 1 pin of A2 ' with join with 4 and 5 ends of door piece A3,14 ends of A3 and 7 ends are connected to positive source and ground respectively, equally, the connection of FM reception unit (211) is identical with unit (212).

3. alarm as claimed in claim 1 is characterized in that: said trigger switch circuit (11) is for counting the trigger switch circuit in limited time.

4. alarm as claimed in claim 3, it is characterized in that: the said trigger switch circuit of counting in limited time contains triode VT1, diode VD1 and VD2, counter A1, K switch and controllable silicon VS1, resistance, the on-off circuit that electric capacity constitutes, the emitter one tunnel of VT1 is connected to 14 and 16 pin of counter A1, one the tunnel is connected to capacitor C 3 and resistance R 3 to ground, the base stage of VT1 is connected to K switch and VD2 13 pin to A1 by resistance R 1, capacitor C 1 is connected between the node and ground of R1 and K switch, K switch one termination power positive pole, resistance R 2 and capacitor C 2 are connected between the positive pole and ground of VD2, capacitor C 3 and resistance R 3 are serially connected with between the emitter and ground of VT1, the negative pole of VD1 is connected to 15 pin of resistance R 3 and capacitor C 3 junction sum counter A1, the VD1 positive pole connects 4 pin of counter A1,11 pin of counter A1 are connected to the control utmost point G of controllable silicon VS1, the anodal A of the collector of VT1 and controllable silicon VS1 is connected to positive source, and the negative pole K of VS1 is as the positive source of audio modulating circuit (12) and vibration radiating circuit (13).

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