CN202145340U

CN202145340U - Capacitance bridge type human body approaching alarm

Info

Publication number: CN202145340U
Application number: CN201120271925U
Authority: CN
Inventors: 刘昭利
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-07-29
Filing date: 2011-07-29
Publication date: 2012-02-15
Anticipated expiration: 2021-07-29

Abstract

The utility model belongs to the technical field of safety protection and electric monitoring and controlling, and relates to a capacitance bridge type human body approaching alarm, comprising a 220V alternating current, a 12V direct current power supply, a capacitive bridge circuit, a signal detection circuit, a signal amplification circuit and an acousto-optic alarm circuit. In the market, the prior finished monitoring apparatuses or facilities have some defects, and in order to overcome the defects existing in the prior various monitoring apparatuses in the market and to resolve the problem of higher prices of the prior various monitoring apparatuses, the capacitance bridge type human body approaching alarm is designed and provided. The monitoring alarm is used for detecting that whether one human body enters into a restricted zone or not, and has functions and effects that: 1 monitoring modes are flexible and various and free of limitations of the size of the restricted zone or the article property, etc.; 2 if the alarm condition occurs, the audio and optic alarm operation of the monitoring apparatus is fast and accurate; 3 the capacitance bridge type human body approaching alarm can resolve the problems of false alarm with no substantial alarm condition and of failing to emit an alarm signal when the dangerous alarm condition occurs; and 4 four monitoring channels of the alarm can be used simultaneously and a portion of monitoring channels also can be used according to requirements.

Description

Capacitance bridge mode human body proximity sensing device

Technical field

The utility model belongs to security protection, electronic monitoring technical field, is about a kind of capacitance bridge mode human body proximity sensing device.

Background technology

Monitoring alarm device kind on the market is a lot, and the mode of obtaining alert mainly contains: the one, and the alarm that the maximum infrared sensor of market share is made for probe (the pyroelectric effect device adds Fresnel Lenses); The 2nd, with vehicle-mounted representative, the alarm made from against shock, tamper evident, noiseproof vibration displacement sensor; The 3rd, the alarm made from touch, inductive probe, microwave probe on a small quantity etc.Though dominance and positive role that these alarms are taken precautions against in a lot of fields are undoubted, also there are some problems in actual use really in they.

Some finished product supervising device or facility exist certain defective on the market, and the utility model is to exist some shortcoming and price to design than problem such as height in order to solve or remedy all kinds of on the market supervising devices.

The described capacitance bridge mode of the utility model human body proximity sensing device is through the kinds of schemes test, compares and analysis, and the utility model only uses the small quantities of usual electronic component to realize intended purposes.Below specify the relevant manufacturing technology of this capacitance bridge mode human body proximity sensing device.

The utility model content

Goal of the invention and beneficial effect: some finished product supervising device or facility exist certain defective on the market, and the utility model is to exist some shortcoming and price to design than problem such as height in order to solve or remedy all kinds of on the market supervising devices.The utility model is mainly used in surveys a kind of the monitoring alarm device whether zone of setting up defences has human body to get into, and major function and effect have:

1. monitor mode is versatile and flexible, does not receive effects limit such as guarded region size or article character;

2. when having alert to take place, the sound of alarm, light actuation of an alarm are clear-cut, agile;

3. wrong report and the dangerous alert that solves no substantive dangerous situation such as fails to report at problem;

4. alarm has 4 monitor channels to use simultaneously, also can use the part monitor channel as required.

Technical characterictic: capacitance bridge mode human body proximity sensing device, to form by 220V alternating current, 12V direct supply, condenser type bridge diagram, signal deteching circuit, signal amplification circuit and sound light alarming circuit, its characteristic comprises:

The condenser type bridge diagram is made up of 4 capacitor C 1～C4; Its connection features is: an end of capacitor C 1 and an end of capacitor C 3 are with the live wire end L that connects the 220V alternating current; The a point of another termination signal deteching circuit of capacitor C 1, the b point of another termination signal deteching circuit of capacitor C 3; One end of capacitor C 2 and an end of capacitor C 4 are with the zero line side N that connects the 220V alternating current, a point of another termination signal deteching circuit of capacitor C 2, the b point of another termination signal deteching circuit of capacitor C 4;

Signal deteching circuit is formed full bridge rectifier by 4 schottky diode D1～D4, and its connection features is: the cathode output end of full bridge rectifier connects the base stage of positive-negative-positive silicon transistor VT1, the cathode output end connection circuit ground GND of full bridge rectifier;

Signal amplification circuit and sound light alarming circuit are made up of positive-negative-positive silicon transistor VT1, NPN type silicon transistor VT2, hummer HA, red light emitting diodes LED; Its connection features is: the anodal VCC of the emitter connection circuit of positive-negative-positive silicon transistor VT1; The collector of positive-negative-positive silicon transistor VT1 connects the base stage of NPN type silicon transistor VT2, and the collector of NPN type silicon transistor VT2 is with connecing the negative pole of hummer HA and the negative pole of red light emitting diodes LED; The positive pole of the positive pole of hummer HA and red light emitting diodes LED is with the anodal VCC of connection circuit, the emitter connection circuit ground GND of NPN type silicon transistor VT2.

Annexation in the composition of other circuit and the circuit between the components and parts

The 12V direct supply is formed the half-wave rectification power supply by power transformer B, silicon rectifier diode D5 and filter capacitor C5; Its connection features is: the primary coil L1 of power transformer B connects the 220V alternating current; The positive pole of the termination silicon rectifier diode D5 of the secondary coil L2 of power transformer B; The anodal VCC of the anodal connection circuit of the negative pole of silicon rectifier diode D5 and filter capacitor C5, the other end of the secondary coil L2 of power transformer B and the negative pole of filter capacitor C5 are with connection circuit ground GND.

The circuit working principle: this capacitance bridge mode human body proximity sensing device is made up of 220V alternating current, direct supply, condenser type electric bridge and signal deteching circuit, signal amplification circuit and sound light alarming circuit.Alarm adopts the capacitance bridge mode as triggering control; Because the capacity of 4 electric capacity equates, so the current potential of 2 of a, b equates that the full bridge rectifier no signal that 4 schottky diode D1～D4 form is exported; At this moment Darlington VT1～VT2 is in cut-off state, and hummer HA is sounding not.When bridge diagram that human body is formed near 4 capacitor C 1～C4; Because the effect of human body distributed capacitance and induction; Break 4 electric capacity and formed the original equilibrium state of bridge diagram; The distributed capacitance of human body can make any 1 capacitance in 4 electric capacity increase, and all can make the current potential of 2 of a, b no longer equal, and 4 schottky diode D1～D4 rectification circuits just have voltage signal output; Then make two silicon transistor VT1, VT2 conducting, make that hummer HA sounding, red light emitting diodes LED are lighted.This alarm can be provided with 4 passages simultaneously or the part passage is set.

Condenser type electric bridge and signal deteching circuit are made up of 4 capacitor C 1～C4,4 schottky diode D1～D4; Signal amplification circuit and sound light alarming circuit are made up of positive-negative-positive silicon transistor VT1, NPN type silicon transistor VT2, hummer HA, LED;

Direct supply is made up of power transformer B, silicon rectifier diode D5 and filter capacitor C5, and the 220V alternating current is through power transformer B step-down, after silicon rectifier diode D5 and the electrochemical capacitor C5 filtering, for alarm provides 12V dc supply.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a capacitance bridge mode human body proximity sensing device; The negative pole of the 12V direct supply in the accompanying drawing 1 links to each other with circuit ground GND.

Embodiment

According to shown in the accompanying drawing 1 with the circuit working schematic diagram and the description of drawings of capacitance bridge mode human body proximity sensing device; And according to the annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the embodiment requires to implement to realize the utility model.

The selection of components and parts and technical parameter thereof

C1～C4 is the high frequency Leaded Ceramic Disc Capacitor, and capacity is 100PF, requires the capacity of 4 capacitor C 1～C4 to equate fully and withstand voltage >=400V; C5 is a filter capacitor, and the capacity that requires electrochemical capacitor is 470 μ F/25V;

D1～D4 is a schottky diode, requires withstand voltage >=20V; D5 is the ordinary silicon commutation diode, and model is 1N4001; LED is ￠ 5 red light emitting diodes;

VT1 is the positive-negative-positive silicon transistor, selects model 2SC9012 for use, requires β >=200; VT2 is a NPN type silicon transistor, and selecting model for use is 2SC9013, requires β >=200;

B is a power transformer, and primary coil L1 voltage is 220V, and secondary coil L2 voltage is 15V, power requirement >=2W; HA is a hummer, requires inside to carry the source of sound electronic circuit, voltage range 9～12V.

Make main points: the capacity requirement of 4 capacitor C 1～C4 is equal fully, otherwise the current potential of 2 of a on the signal deteching circuit, b can not keep equipotential; And the capacity of 4 capacitor C 1～C4 can not be greater than 10% of nominal capacity, otherwise influences the sensitivity of human body sensing; In order to improve the sensitivity of signal deteching circuit, commutation diode D1～D4 must use the very little schottky diode of forward voltage drop, otherwise also will influence the sensitivity of testing circuit significantly.

Circuit debugging: the circuit of capacitance bridge mode human body proximity sensing device is so long as the electronic devices and components performance of using is intact; Annexation according to components and parts shown in the accompanying drawing 1 is welded; And to physics wiring is conscientiously checked and is checked; And install, welding errorless after, circuit need not be debugged basically can operate as normal.

In the debugging if after finding that circuit is connected alternating-current power supply; Hummer HA, red light emitting diodes LED just start working; The current potential that a, b in this explanation circuit is 2 is unequal; Can any two among capacitor C 1～C4 be exchanged, or whether equate with the capacity that capacitance meter detects 4 capacitor C 1～C4 again.

Method of application: require the wire length≤4m of each monitor channel of 4 capacitor C 1～C4 of connection, otherwise will influence the reliability of alarm; To pay special attention to safety during installation, because of the work of alarm is the balance that influence capacitance bridge through the induction of human body distributed capacitance, so, can 4 capacitor C 1～C4 (4 probes) be aided with wrapped with insulation when mounted, to guarantee personal safety.

Claims

1. a capacitance bridge mode human body proximity sensing device is made up of 220V alternating current, 12V direct supply, condenser type bridge diagram, signal deteching circuit, signal amplification circuit and sound light alarming circuit, and its characteristic comprises:

Signal amplification circuit and sound light alarming circuit are made up of positive-negative-positive silicon transistor VT1, NPN type silicon transistor VT2, hummer HA, red light emitting diodes LED; Its connection features is: the anodal VCC of the emitter connection circuit of positive-negative-positive silicon transistor VT1; The collector of positive-negative-positive silicon transistor VT1 connects the base stage of NPN type silicon transistor VT2, and the collector of NPN type silicon transistor VT2 is with connecing the negative pole of hummer HA and the negative pole of red light emitting diodes LED; The positive pole of the positive pole of hummer HA and red light emitting diodes LED is with the anodal VCC of connection circuit, the emitter connection circuit ground GND of NPN type silicon transistor VT2;

The 12V direct supply is formed the half-wave rectification power supply by power transformer B, silicon rectifier diode D5 and filter capacitor C5; Its connection features is: the primary coil L1 of power transformer B connects the 220V alternating current; The positive pole of the termination silicon rectifier diode D5 of the secondary coil L2 of power transformer B; The anodal VCC of the anodal connection circuit of the negative pole of silicon rectifier diode D5 and filter capacitor C5, the negative pole connection circuit ground GND of the other end of the secondary coil L2 of power transformer B and filter capacitor C5.