CN103871190A

CN103871190A - Bridge balance type two-way wired monitoring device

Info

Publication number: CN103871190A
Application number: CN201410134503.8A
Authority: CN
Inventors: 黄宇嵩
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-04-02
Filing date: 2014-04-02
Publication date: 2014-06-18

Abstract

The invention discloses a bridge balance type two-way wired monitoring device which is characterized in that a 6 V direct-current power supply, two monitoring probes, a bridge balance circuit and a buzzer driving circuit are included, the two monitoring probes are used for replacing two arms in the bridge balance circuit respectively, a first monitoring probe comprises a microswitch K1 and a resistor R1, a second monitoring probe comprises a microswitch K2 and a resistor R2, the bridge balance circuit comprises a PNP type transistor VT1, a PNP type transistor VT2, the two monitoring probes, a linear potentiometer RP, a resistor R3 and an electrolytic capacitor C1, and the buzzer driving circuit comprises an NPN type transistor VT3 and a buzzer HA. In the market, some finished product monitoring devices have certain shortcomings, and the shortcomings of some monitoring devices in the market can be overcome by the device. Each channel has an anti-damaging function, and the phenomenon of misinformation and information missing can be basically avoided.

Description

Bridge balance formula two-way wired monitoring device

Technical field

The invention belongs to electronic monitoring technical field processed, relate to a kind of bridge balance formula two-way wired monitoring device.

Background technology

Monitoring alarm device kind on market is a lot, and the mode of obtaining alert has multiple: the one, and the infrared sensor of market share maximum is the alarm of probe (adding Fresnel Lenses with pyroelectric effect device) manufacture; The 2nd, take vehicle-mounted as representative, the alarm manufactured with against shock, tamper evident, noiseproof vibration displacement sensor; The 3rd, the alarm of manufacturing with touch, inductive probe, microwave probe on a small quantity etc.Although leading position and positive role that these alarms are taken precautions against in a lot of fields should affirm, also there are some problems in them in actual use really.

The many disadvantages existing in order to solve some finished product supervising device or facility, bridge balance formula two-way wired monitoring device of the present invention can solve or make up the shortcoming that some supervising device exists on the market.

Below describe bridge balance formula two-way wired monitoring device of the present invention related relevant technologies content in implementation process in detail.

Summary of the invention

Goal of the invention and beneficial effect: the present invention is for surveying a kind of supervising device that whether region of setting up defences has human body to enter or whether the object of setting up defences is moved, and major function has: monitor mode is versatile and flexible, the effects limit such as not monitored area size or article character; In the time having alert to occur, the action of monitoring alarm sound is clear-cut, agile; While having alert to occur, circuit energy self-locked circuit working state, remove monitor state, must take corresponding measure by operator on duty; Solve without the wrong report of substantive dangerous situation and dangerous alert and the problem such as fail to report; Two-way monitor channel can use simultaneously, also can use as required a road monitor channel.

With the bridge balance formula two-way wired monitoring device of two PNP transistor composition bridge balance circuit productions, this technical scheme has been simplified circuit structure, reduce manufacture difficulty and the cost of supervising device, and realized the requirements such as monitoring is highly sensitive, reliable working performance.

Each passage all has destruction-proof function, the action such as implement short circuit once run into that certain road monitoring probe is touched or burglar has found cloth defence line or be sheared, supervising device is immediately with meeting sounding report alert news, the hummer uninvited guest in region that sets up defences once sounding cannot remove voluntarily, removes monitoring or withdraws a garrison and must be carried out by professional.

Monitoring probe good concealment.Because probe is not the probe of real meaning, probe size may diminish to be ignored, so probe is easily hidden installation and is difficult to be realized, makes burglar cannot hide monitoring probe.

Substantially stop wrong report and the phenomenon such as fail to report, only unsafe factor occurring really, comprising that illegally entering roughly Shi Caihui reports to the police, can be because not thundering, blow out, the phenomenon such as vibrations occurs without substantial wrong report, also can not fail to report because of technical crime.

Circuit working principle: bridge balance formula two-way wired monitoring device forms direct current bridge by resistance R 1～R4, in the time that 2 road monitoring probes are all in monitor state, in circuit, a, two reference potential points of b equate, in the time of bridge diagram balance: Va=Vb=3.0V, Vab=0, PNP transistor VT1～VT2 and NPN transistor VT3 end, and hummer HA is noiseless, and at this moment 2 road monitoring probes are all in warning armed state.When microswitch K1 disconnects or external cloth defence line while opening circuit, electrochemical capacitor C1 is charged to about 6V and makes PNP transistor VT2 conducting, and then NPN transistor VT3 conducting drives hummer HA to send the sound.

In the time of the short circuit of external cloth defence line, the direct connection circuit of PNP transistor VT1 base stage ground GND, therefore makes PNP transistor VT1 conducting, and NPN transistor VT3 is conducting also, and hummer HA also sounds a buzzer.

In like manner, the monitoring probe course of work in the 1st paths is the same.

Once run into that a certain road monitoring probe is touched or cloth defence line by short circuit or be sheared, supervising device sounding report immediately alert news, hummer HA is once sounding, bridge balance circuit out of trim at once, enter so the uninvited guest who sets up defences in region and cannot remove voluntarily alert news, alert news is removed or is withdrawn a garrison and must be cut off by operator on duty the direct supply of supervising device.

Technical characterictic: bridge balance formula two-way wired monitoring device, it comprises 6V direct supply, 2 road monitoring probes, bridge balance circuit, buzzer drive circuit, it is characterized in that:

2 road monitoring probes: it replaces respectively 2 arms in bridge balance circuit with 2 road monitoring probes, and the 1st road monitoring probe is made up of microswitch K1 and resistance R 1, and the 2nd road monitoring probe is made up of microswitch K2 and resistance R 2;

Bridge balance circuit: it is by PNP transistor VT1, PNP transistor VT2, 2 road monitoring probes and linear potentiometer RP and resistance R 3, electrochemical capacitor C1 forms, NPN transistor VT1 base stage and PNP transistor VT2 emitter connect respectively 2 road monitoring probes, PNP transistor VT1 emitter and NPN transistor VT2 base stage connect linear potentiometer RP one end and resistance R 3 one end, the anodal VCC of the linear potentiometer RP other end and movable end connection circuit thereof, resistance R 3 other end connection circuit ground GND, NPN transistor VT2 emitter connects electrochemical capacitor C1 positive pole, electrochemical capacitor C1 negative pole connection circuit ground GND,

Buzzer drive circuit: it is made up of NPN transistor VT3 and hummer HA, NPN transistor VT3 base stage connects PNP transistor VT1 collector and PNP transistor VT2 collector, NPN transistor VT3 collector connects hummer HA negative pole, the anodal VCC of the anodal connection circuit of hummer HA, NPN transistor VT3 emitter connection circuit ground GND;

The anodal VCC of 6V DC power anode connection circuit, 6V DC power cathode connection circuit ground GND.

Accompanying drawing explanation

Accompanying drawing 1 is embodiment circuit working schematic diagram of bridge balance formula two-way wired monitoring device provided by the invention.2 microswitch K1～K2 in circuit working schematic diagram use normally closed contact, and what in circuit theory diagrams, connect 2 road monitoring probes is cloth defence line.

Embodiment

According to bridge balance formula two-way wired monitoring device circuit working schematic diagram and accompanying drawing explanation shown in accompanying drawing 1, and according to annexation between components and parts in the each several part circuit described in summary of the invention, and the components and parts technical parameter described in embodiment requires and circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.

The technical parameter of components and parts and making requirement

1. components and parts select to consider that supervising device must adapt to the long-term uninterrupted requirement using, so make every effort to take working stability, reliable operation as principle the wide and resistant to elevated temperatures components and parts of screening thermal adaptability;

2. component parameters is shown in components and parts title and technical parameter

Components and parts numbering	Components and parts title	Major parameter	Quantity	Remarks
					VT1、VT2	PNP transistor	2SC9014、TO—92	2	Or 2SC9012
VT3	NPN type crystal	2SC9015 or 3AX81	1	Domestic model
					RP	Linear potentiometer	120KΩ	1	Fine setting
K1、K2、	Microswitch	Or tongue tube etc.	2	Monitoring probe
					R1、R2、R3	Resistance	100KΩ、1/16W	3	Or Chip-R
C1	Electrochemical capacitor	22μF/16V	1	?
					HA	Hummer (inside having voicefrequency circuit)	￠ 10, voltage: 5V	1	?

3. the making of monitoring probe: making monitoring probe is an important step, for strengthening the hidden effect of monitoring probe, microswitch in 2 road monitoring probes will be integrated with 2 resistance R 1～R2 combination sealing respectively, particularly the resistance in 2 road monitoring probes to note hidden, select stability better, the 1/16W metalfilmresistor of small volume or select 1206 type Chip-Rs.

Circuit production main points and circuit debugging method

Because of the circuit structure of bridge balance formula two-way wired monitoring device fairly simple, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing 1 is welded to specifications, physical connection line and welding quality are after careful inspection is correct, and circuit of the present invention only need to carry out simple debugging and can normally work;

The key point of circuit debugging is to adjust the balance of bridge diagram.In the time that direct supply voltage is 6V, adjusts linear potentiometer RP and make a point voltage-to-ground in circuit equal the voltage-to-ground that b is ordered, that is: Va=Vb=3.0V.During respectively by resistance R 1, resistance R 2 short circuits or open circuit, can make NPN transistor VT3 output voltage >=5.0V, at this moment hummer HA obtains electric ring, and 2 road monitor channels should have respectively same action reflection;

Tracking: bridge balance formula two-way wired monitoring device is connected to cloth defence line and monitoring probe, make supervising device under different direct supply voltage, artificially simulate various alerts, Dui Ge road prison spy passage carries out combined debugging respectively.

Technical indicator and using method

1. direct supply: 4.5～7.5V can establish 4 joint 7 ﹟ alkaline batteries as direct supply in device;

2. wait for electric current :≤90 μ A, when when alarm, working current is 26mA(6V direct supply, record), because circuit is when the static state, transistor VT1～VT3 all ends, hummer HA is noiseless, 4 joint 7 ﹟ alkaline batteries only have resistance R 1～R3 and linear potentiometer RP to consume little electrical energy, therefore can use for a long time;

3. monitor channel: 2 tunnels;

4. command range: >=400m, selects the thicker cloth defence line of wire diameter, and monitoring command range can significantly increase;

5. monitoring probe selects microswitch still to select magnetic switch, should determine according to protection object character and fence coverage.

Claims

1. a bridge balance formula two-way wired monitoring device, it comprises 6V direct supply, 2 road monitoring probes, bridge balance circuit, buzzer drive circuit, it is characterized in that:

2 described road monitoring probes, it replaces respectively 2 arms in bridge balance circuit with 2 road monitoring probes, and the 1st road monitoring probe is made up of microswitch K1 and resistance R 1, and the 2nd road monitoring probe is made up of microswitch K2 and resistance R 2;

Described bridge balance circuit is by PNP transistor VT1, PNP transistor VT2, 2 road monitoring probes and linear potentiometer RP and resistance R 3, electrochemical capacitor C1 forms, NPN transistor VT1 base stage and PNP transistor VT2 emitter connect respectively 2 road monitoring probes, PNP transistor VT1 emitter and NPN transistor VT2 base stage connect linear potentiometer RP one end and resistance R 3 one end, the anodal VCC of the linear potentiometer RP other end and movable end connection circuit thereof, resistance R 3 other end connection circuit ground GND, NPN transistor VT2 emitter connects electrochemical capacitor C1 positive pole, electrochemical capacitor C1 negative pole connection circuit ground GND,

Described buzzer drive circuit is made up of NPN transistor VT3 and hummer HA, NPN transistor VT3 base stage connects PNP transistor VT1 collector and PNP transistor VT2 collector, NPN transistor VT3 collector connects hummer HA negative pole, the anodal VCC of the anodal connection circuit of hummer HA, NPN transistor VT3 emitter connection circuit ground GND;

The anodal VCC of described 6V DC power anode connection circuit, 6V DC power cathode connection circuit ground GND.