CN2308921Y - Wireless anti-theft alarm - Google Patents

Abstract

The utility model discloses a wireless anti-theft alarm. A booster power control circuit and a booster power circuit are additionally arranged in a transmitter; the booster power control circuit changes trigger signals generated by a signal amplifying circuit into single-pulse signals with a section of time interval; in the period of the action of the single-pulse signals, the booster power circuit works to generate direct current voltage which is required by a transmitting circuit. The alarm does not need frequently to replace batteries; when a transmitting tube in the transmitting circuit needs higher voltage, the wireless anti-theft alarm only needs to change the turns ratio of a transformer of the booster power circuit is changed to meet the circuit requirements, and operation is stable; alarm signals can be received in the further distance.

Description

The wireless anti-theft alarming device

The utility model relates to a kind of wireless anti-theft alarming device.

The patent No. " ZL96234272.6 " discloses a kind of " safety cabinet wireless anti-theft alarming device ".In this alarm, for improving emissive power, power valve collector required voltage adopts the power supply of 22.5V laminated cell, power supply mode is that this battery is inserted the power valve collector loop all the time, owing to self-discharge of battery and the intrinsic little reason of capacity of battery, and make the alarm work instability, produce and fail to report the police.

The purpose of this utility model is to overcome the weak point of directly bringing with battery power supply station in the above-mentioned prior art, booster power control circuit and booster power supply circuit in transmitter, have been increased, only when need emission alerting signal, booster power supply circuit just starts work, thereby has guaranteed the long-term stability of power valve collector required voltage.

For achieving the above object, the technical scheme that the utility model adopted is: this alarm is made up of transmitter and receiver, transmitter comprises: sensor, signal amplification circuit, the booster power control circuit, booster power supply circuit, coded signal sending controling circuit, coded signal generation circuit and radiating circuit; Receiver comprises: the high frequency amplification demodulatoring circuit, amplification and rectification circuit, decoding circuit, sound alarm circuit or telephone automatic alarm device, the trigger pip that the booster power control circuit produces signal amplification circuit changes a period of time single pulse signal at interval into, at single pulse signal between action period, booster power supply circuit work, booster power supply circuit is in order to produce the required DC voltage of radiating circuit.

The utility model has the advantages that:

1, need not often change battery, when power valve in the radiating circuit needed more high voltage, a transformer turn ratio that only needs to change in the booster power supply circuit just can satisfy circuit requirement.

2, working stability is reliable, and can receive alerting signal in farther distance.

Fig. 1 (a) is the circuit block diagram of the utility model transmitter.

Fig. 1 (b) is the circuit block diagram of the utility model receiver.

Fig. 2 is a kind of physical circuit figure of booster power control circuit among Fig. 1 (a).

Fig. 3 is the another kind of physical circuit figure of booster power control circuit among Fig. 1 (a).

Fig. 4 is a kind of physical circuit figure of booster power supply circuit among Fig. 1 (a).

In conjunction with the accompanying drawings the utility model is elaborated.

Shown in Fig. 1 (a), the sensor 1 that faint mechanical vibration constitute through piezoelectricity singing piece, change electric signal into, produce the warning trigger pip through signal amplification circuit 2 again, after this trigger pip triggers booster power control circuit 3, its trigger pip just changes a period of time single pulse signal at interval into, and between action period, booster power supply circuit 4 is worked at single pulse signal.Booster power supply circuit 4 is in order to produce the required DC voltage of radiating circuit 7.Above-mentioned trigger pip triggers coded signal sending controling circuit 5 simultaneously, produce the coded pulse signal of a period of time with control coded signal generation circuit 6, radiating circuit 7 is modulated above-mentioned pulse signal of having encoded to frequency electromagnetic waves, input aerial again, emitting radio wave.

Shown in Fig. 1 (b), antenna receives the radiowave of transmitter emission after 8 demodulation of high frequency amplification demodulatoring circuit, the output encoder pulse signal, again after amplification and rectification circuit 9 is handled, be input to decoding circuit 10, when identical, produce the warning trigger pip with presetting cipher, handle by sound alarm circuit 11 or telephone automatic alarm device 12, produce chimes of doom.

By shown in Figure 2, the input end a of Sheffer stroke gate 13 and the Ausgang of Sheffer stroke gate 14 join, and another input end b is by divider resistance R ₁Receive power positive end, pass through capacitor C ₁Receive the output terminal of signal amplification circuit 2, output terminal c passes through capacitor C ₂Receive input end d, the e of Sheffer stroke gate 14, this input end d, e pass through resistance R ₂Ground connection, the output terminal c of Sheffer stroke gate 13 receives the input end A of booster power supply circuit 4.Work as power connection, during the alarm free signal, the input end b of Sheffer stroke gate 13 is a high level, input end d, the e of Sheffer stroke gate 14 is low level, the input end a of the Ausgang of Sheffer stroke gate 14 and Sheffer stroke gate 13 is all high level, and the output terminal c of Sheffer stroke gate 13 is a low level, and booster power supply circuit 4 is not worked.When input negative sense alerting signal, the output terminal c output high level of Sheffer stroke gate 13, booster power supply circuit 4 is started working, along with capacitor C ₂Electric charge to resistance R ₂Discharge, when input end d, the e of Sheffer stroke gate 14 turned to low level by high level, the input end a of the Ausgang of Sheffer stroke gate 14 and Sheffer stroke gate 13 transferred high level to by low level, made the output terminal c of Sheffer stroke gate 13 transfer low level to by high level, finish booster power work, select resistance R ₂, capacitor C ₂Working time of controllable parameters system booster power.

Figure 3 shows that another physical circuit figure of booster power control circuit 3, adopt time base circuit 15 to constitute, for example, time base circuit 555, input end P ₂Receive the output terminal of signal amplification circuit 2, output terminal P ₃Receive the input end A of booster power supply circuit 4.As input end P ₂During input negative sense alerting signal, P ₃End output high level, booster power supply circuit 4 work.When power supply through resistance R ₃To capacitor C ₃When being charged to 2/3 supply voltage, output terminal P ₃Transfer low level to by high level, booster power quits work.

Booster power control circuit 3 also can adopt other multiple circuit form.

By shown in Figure 4, a kind of connection of booster power supply circuit 4 is the excitation winding L of transformer B ₁End of the same name and the other end respectively with triode BG ₂, BG ₃Base stage link to each other elementary winding L ₂End of the same name and the other end respectively with triode BG ₃, BG ₂Collector link to each other the output winding L ₃Receive rectification circuit, two winding L ₁, L ₂Center tap between be connected to resistance R ₆, winding L ₂Center tap link to each other triode BG with the anode of power supply ₁Collector and triode BG ₂, BG ₃Emitter link to each other, and through resistance R ₅Receive power positive end, triode BG ₁Grounded emitter, the output terminal of base stage and booster power control circuit 3 joins.

In order to prevent triode BG ₂With BG ₃Might puncture, in the excitation winding L of transformer B ₁End of the same name and triode BG ₂Base stage between be connected to diode D ₁, in the excitation winding L ₁The other end and triode BG ₃Base stage between be connected to diode D ₂Disturb in order further to eliminate, in the elementary winding L of transformer B ₂Center tap and triode BG ₂Emitter between be connected to capacitor C ₆In addition, better for the stability that guarantees booster power supply circuit 4, encouraging winding L ₁Center tap and ground between be connected to capacitor C ₅

The principle of work of booster power supply circuit 4 is as follows: when the triggerless alerting signal was imported, the A point was a low level, triode BG ₁End triode BG ₂, BG ₃Emission high level very, booster power supply circuit is not worked.When the triggering alerting signal of positive level is imported, triode BG ₁Saturation conduction, BG ₂, BG ₃Launch very low level, booster power supply circuit 4 is started working, and supply voltage is through R ₆To BG ₂, BG ₃The base stage injection current because two triode BG ₂, BG ₃Symmetry adds the primary winding L fully ₂With the excitation winding L ₁Be connected into positive feedback, make triode BG ₂And BG ₃Form alternate conduction, end, in transformer B output winding L ₃On induce alternating voltage, change DC voltage into through the bridge circuit full-wave rectification.

Claims (6)

1, a kind of wireless anti-theft alarming device is made up of transmitter and receiver,

Transmitter comprises: sensor (1), signal amplification circuit (2), coded signal sending controling circuit (5), coded signal generation circuit (6), radiating circuit (7);

Receiver comprises: high frequency amplification demodulatoring circuit (8), amplification and rectification circuit (9), decoding circuit (10), sound alarm circuit (11) or telephone automatic alarm device (12);

Of the present utility model being characterised in that, transmitter also comprises:

Booster power control circuit (3), the trigger pip that signal amplification circuit (2) is produced changes a period of time single pulse signal at interval into, and between action period, booster power supply circuit (4) is worked at single pulse signal;

Booster power supply circuit (4) is in order to produce the required DC voltage of radiating circuit (7).

2, alarm according to claim 1 is characterized in that: the connection of booster power control circuit (3) is, the input end a of Sheffer stroke gate (13) and the Ausgang of Sheffer stroke gate (14) join, and another input end b is by divider resistance R ₁Receive power positive end, pass through capacitor C ₁Receive the output terminal of signal amplification circuit (2), output terminal c passes through capacitor C ₂Receive input end d, the e of Sheffer stroke gate (14), this input end d, e pass through resistance R ₂Ground connection, the output terminal c of Sheffer stroke gate (13) receives the input end A of booster power supply circuit (4).

3, alarm according to claim 1 is characterized in that: booster power control circuit (3) adopts time base circuit (15) to constitute.

4, alarm according to claim 1 is characterized in that: the connection of booster power supply circuit (4) is the excitation winding L of transformer B ₁End of the same name and the other end respectively with triode BG ₂, BG ₃Base stage link to each other elementary winding L ₂End of the same name and the other end respectively with triode BG ₃, BG ₂Collector link to each other the output winding L ₃Receive rectification circuit, two winding L ₁, L ₂Center tap between be connected to resistance R ₆, winding L ₂Center tap link to each other triode BG with the anode of power supply ₁Collector and triode BG ₂, BG ₃Emitter link to each other, and through resistance R ₅Receive power positive end, triode BG ₁Grounded emitter, the output terminal of base stage and booster power control circuit (3) joins.

5, alarm according to claim 4 is characterized in that: in the excitation winding L of transformer B ₁End of the same name and triode BG ₂Base stage between be connected to diode D ₁, in winding L ₁The other end and triode BG ₃Base stage between be connected to diode D ₂

6, according to claim 4,5 described alarms, it is characterized in that: in the elementary winding L of transformer B ₂Center tap and triode BG ₂Emitter between be connected to capacitor C ₆, in the excitation winding L ₁Center tap and ground between be connected to capacitor C ₅

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