CN2158553Y - Infrared theft or intruder alarm - Google Patents

Abstract

The utility model relates to an alarming and monitoring device which is controlled by an infrared sensor. When infrared wave signals are received by the infrared sensor, the infrared wave signals are amplified by an amplifying circuit to switch a control circuit on, so the broken circuit is attracted to close and the host operating circuit of the alarm is switched on. An RC delay circuit is additionally arranged in front of a control circuit, preventing from false alarms caused by abnormal signals. At the same time, a monitoring device, which is composed of a miniature microphone and a pre-audio amplifying circuit, is connected with a relay switching circuit, and the monitoring device which is arranged behind the relay switching circuit is controlled by the relay switching circuit. Alarm signals are identified by the monitoring device when the alarm circuit is switched on, and the utility model can record and take evidence in time.

Description

Infrared theft or intruder alarm

The utility model relates to a kind of warning and monitoring device by infrared sensor control.

In the prior art, the alarm of controlling with infrared sensor only has single warning function, as commercially available U.S. CK company import detector.Such detector sensitivity is very high, moves in monitoring range in case experience small thermal source, and alarm will send alerting signal.In the most monitored environment of China, especially summer the door and window open-ventilating the area, some toys turnover ranges to be monitored and cause that the situation of wrong report happens occasionally make the operator on duty produce false alarm, produce paralysis absent-mindedness thought then.The reliability of warning device thereby be affected.

The purpose of this utility model is the alarm that a kind of Control work circuit turn-on of delaying time when sense signal will be provided, and has additional the integrated alarm device of monitoring device simultaneously.

The purpose of this utility model realizes by following technical measures: be made up of power circuit, mu balanced circuit, infrared sensor, amplifying circuit, control circuit, relay and alarm main frame etc.When infrared sensor receives the infrared waves signal, make the relay adhesive, connect alarm host work circuit by the amplifying circuit trigger control circuit.The utility model is provided with delay circuit before control circuit, described delay circuit is the RC delay circuit.When passing through range to be monitored in the toy short time, this circuit plays time-delay, buffer action, to differentiate alerting signal.The utility model also is connected with monitoring device on the on-off circuit that relay is controlled.Described monitoring device is by microtelephone, and preposition audio amplifier circuit is formed.When alerting signal is sent, monitoring device work.

The utility model is provided with the RC delay circuit before control relay circuit, when infrared sensor is experienced the infrared waves signal of moment appearance, when the ultra-weak electronic signal of output was transported to control circuit through the amplifying circuit amplification, because the capacitance discharges effect, control circuit was not worked.And when infrared waves signal sense of continuity was subjected to signal, the electric current that adds to the control circuit front end was greater than discharge current, and then conducting of control circuit is to distinguish true and false signal.When warning circuit was connected, the monitoring device that the utility model is set up was also implemented to monitor simultaneously, is beneficial to further explanation and differentiates alerting signal.And the evidence obtaining of can in time recording.

Provide embodiment below in conjunction with accompanying drawing.

Fig. 1 is an electrical schematic diagram of the present utility model.

Referring to Fig. 1, IC ₂Be integrated voltage stabilizer, when input voltage changed in the 90-120% of ratings scope, circuit all can output rated voltage.Sensor Q ₁Be pyroelectric infrared sensor.R ₃Be negative temperature coefficient resister, in order to improve human body temperature difference infrared wavelength amplification quantity hour under summer or hot environment.IC ₁Be integrated amplifier.Triode Q ₂, Q ₃Form control circuit, wherein Q ₂With resistance R ₅And capacitor C ₆The delay circuit of forming plays the time-delay buffer action.K switch ₁Be the pacing switch, this switch and light emitting diode Q ₄Serial connection is used to detect the scope of security area.K switch ₂Be impedance switch, be convenient to impedance matching with alarm host machine.K switch _3-1, K _3-2Be relay switch, wherein K _3-1Control alarm main frame; K _3-2The control monitoring device.Triode Q ₅Be that preposition audio frequency amplifies, by the electric signal of microtelephone output through Q ₅And capacitor C ₇Carry audio voltage to main control system.During work, connect voltage, infrared sensor Q ₁In running order.Work as Q ₁Receive infrared wavelength when being the 9-10um signal, just export a faint electric signal, this electric signal is through IC ₁Add to triode Q behind the amplifying circuit ₂Base stage.At this moment, when entering guarded region than toy in this way, the electric current that moment produces is through R ₅And C ₆The circuit of forming discharges Q ₂Not conducting, system does not work.When human body enters guarded region, infrared sensor Q ₁Output one is than the forceful electric power signal, through IC ₁Add to triode Q after the amplification ₂Base stage.The rapid trigger triode Q of this voltage ₂Thereby, engage relay J.Relay switch K _3-1Conducting alarm host circuit, K switch _3-2Then connect monitoring device simultaneously.

Among the figure: Q ₁P2288; Q ₂, Q ₃, Q ₅9013;

IC ₁LM324；IC ₂7805；

Q ₄Light emitting diode; Q ₆2CP;

C ₁100uf；

C ₂0.01uf；

C ₃、C ₄、C ₅47uf；

C ₆33uf；

C ₇22uf；

R ₁10k；

R ₂100k；

R ₃100k；

R ₄3.3k；

R ₅200k；

R ₆5.6k；

R ₇100Ω；

R ₈4.7k；

R ₉2.2k；

R ₁₀560Ω。

Claims (3)

1, a kind of infrared alarm audiomonitor is by power circuit, mu balanced circuit, infrared sensor Q ₁, amplifying circuit IC ₁, control circuit, relay J and alarm main frame form infrared sensor Q ₁When receiving signal, by amplifying circuit IC ₁Trigger control circuit makes the relay J adhesive, connects alarm host work circuit, it is characterized in that: be provided with delay circuit before the described control circuit; Also be connected with monitoring device on the described relay J on-off circuit.

2, infrared alarm audiomonitor as claimed in claim 1 is characterized in that: described delay circuit is the RC delay circuit.

3, infrared alarm audiomonitor as claimed in claim 1 is characterized in that: described monitoring device is by microtelephone, and preposition audio amplifier circuit is formed.

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