CN103076488A - Non-contact-induction-type voltage tester - Google Patents

Non-contact-induction-type voltage tester Download PDF

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Publication number
CN103076488A
CN103076488A CN 201310000544 CN201310000544A CN103076488A CN 103076488 A CN103076488 A CN 103076488A CN 201310000544 CN201310000544 CN 201310000544 CN 201310000544 A CN201310000544 A CN 201310000544A CN 103076488 A CN103076488 A CN 103076488A
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China
Prior art keywords
circuit
pin
time base
induction
contact
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CN 201310000544
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Chinese (zh)
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丁希庆
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Individual
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Individual
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Priority to CN 201310000544 priority Critical patent/CN103076488A/en
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Abstract

The invention relates to a non-contact-induction-type voltage tester, which is technically characterized in that the non-contact-induction-type voltage tester consists of a 6V direct-current power supply, a induction signal detection circuit, a multivibrator circuit and an audio output circuit, and the model of a time-base circuit IC1 in the multivibrator circuit is NE555. The non-contact-induction-type voltage tester not only can detect whether a detected metal object is charged or not, but also effectively overcomes the defects existing in the traditional screwdriver type voltage tester because the induction probe TX of the voltage tester is wrapped by insulating materials, the induction probe is not required to directly touch the charged metal object during use and the induction probe is only required to get close to a charged area for detection. The non-contact-induction-type voltage tester overcomes the defect that the traditional screwdriver type voltage tester can only recognize dangerous contact voltage, i.e. voltage above 100V, and cannot test non-dangerous induced voltage below 80V. By adopting the technical scheme, tools which are daily used by electricians can be developed.

Description

The non-contact induction type electricity measurer
Technical field
The invention belongs to the application of electronic technology field, is about a kind of non-contact induction type electricity measurer.
Background technology
The structure of tradition test pencil is to be composed in series by examination electrical contact, current-limiting resistance, neon tube, metal spring and hand touched electrode.Test contact and tested live metal object contact, staff contact hand touched electrode consists of the loop, and when tested metal object had higher voltage with respect to the earth, the neon tube starter represented that tested metal object is charged.But some occasion 220V AC power does not have metal is partly exposed to be needed to detect in the insulated conductor whether electricity be arranged outside, or when the trouble spot of concealed wiring done to detect, it is helpless that traditional test pencil just seems; Moreover the metal shell of some electrical appliance or hardware are with the electric shock voltage that human body is safe from danger, only produce electromotive force so that the electrical appliance metal shell is charged by the distributed capacitance induction, and general test pencil is difficult to identify the induced voltage that is lower than 80V, whether this has electricity to bring certain limitation for the detection electrical appliance, is easy to cause erroneous judgement.
The invention provides a kind of non-contact induction type electricity measurer, whether it can not only measure tested metal object charged, and the inductive probe of non-contact induction type electricity measurer is insulated the material parcel, when using electricity measurer, inductive probe does not need directly to touch the live metal object, as long as inductive probe can detect near charging zone, effectively remedied the defective that existing test pencil exists.Overcome traditional test pencil and can only identify adventurous electric shock voltage (that is: greater than 100V voltage), can not test the following defective without dangerous induced voltage of 80V.The non-contact induction type electricity measurer has that circuit structure is simple, dependable performance, the advantage such as easy to use, and utilizing this technical scheme to develop becomes electrician's instrument used in everyday.
Below describe non-contact induction type electricity measurer of the present invention related correlation technique content in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: the invention provides a kind of non-contact induction type electricity measurer, whether it can not only measure tested metal object charged, and the inductive probe of non-contact induction type electricity measurer is insulated the material parcel, when using electricity measurer, inductive probe does not need directly to touch the live metal object, as long as inductive probe can detect near charging zone, effectively remedied the defective that traditional test pencil exists.Overcome traditional test pencil and can only identify adventurous electric shock voltage (that is: greater than 100V voltage), can not test the following defective without dangerous induced voltage of 80V, utilizing this technical scheme to develop becomes electrician's instrument used in everyday.
Technical characterictic: the non-contact induction type electricity measurer, it is comprised of 6V direct supply, induced signal testing circuit, multi-resonant oscillating circuit and audio output circuit, and its feature comprises:
The induced signal testing circuit: it is comprised of inductive probe TX, field effect transistor VT1 and potentiometer RP, the grid G of field effect transistor VT1 meets inductive probe TX, the drain D of field effect transistor VT1 connects the end of potentiometer RP, the anodal VCC of the other end of potentiometer RP and movable end connection circuit thereof, the source S connection circuit ground GND of field effect transistor VT1;
Multi-resonant oscillating circuit: it is comprised of time base circuit IC1, capacitor C 1 and resistance R 1, the model that time base circuit IC1 selects is NE555, the 4th pin of time base circuit IC1 connects the drain D of field effect transistor VT1, the 2nd pin of time base circuit IC1 and the 6th pin connect an end of capacitor C 1 and an end of resistance R 1, the 3rd pin of another termination time base circuit IC1 of resistance R 1, the other end connection circuit ground GND of the 1st pin of time base circuit IC1 and capacitor C 1, the anodal VCC of the 8th pin connection circuit of time base circuit IC1;
Audio output circuit: it is comprised of electrochemical capacitor C1 and loudspeaker SP, and the 3rd pin of time base circuit IC1 connects the positive pole of electrochemical capacitor C1, and the negative pole of electrochemical capacitor C1 connects the end of loudspeaker SP, the other end connection circuit ground GND of loudspeaker SP;
The anodal VCC of the anodal connection circuit of 6V direct supply, the negative pole connection circuit ground GND of 6V direct supply.
The circuit working principle: the non-contact induction type electricity measurer consists of a multivibrator by time base circuit IC1 and peripheral cell.Field effect transistor VT1 in the accompanying drawing 1 is in zero bias condition when flat, resistance between field effect transistor VT1 drain D, the source S is very little, so that the 4th pin of the time base circuit IC1 that field effect transistor VT1 drain D links to each other is in low level (less than 0.7V), at this moment time base circuit IC1 does not work, and loudspeaker SP can sounding.When in case inductive probe TAN senses electric field signal on the grid G of field effect transistor VT1, drain D, the resistance value between the source S of field effect transistor VT1 will increase, make the 4th pin of time base circuit IC1 obtain high voltage (much larger than 0.7V), multivibrator is started working, the 3rd pin of time base circuit IC1 connect loudspeaker SP just send " too " sound.Resistance R 1 act as negative feedback resistor, be used for stabilizing circuit work, improve output tonequality and establish.
Description of drawings
Accompanying drawing 1 is a non-contact induction type electricity measurer embodiment circuit working schematic diagram provided by the invention.
Embodiment
The below is accompanying drawing 1 and description of drawings to specifications, and according to the annexation between the components and parts in the described each several part circuit of summary of the invention, described components and parts technical parameter requires correlation technique of the present invention is further described with the following Examples.
The selection of components and parts and technical parameter thereof
IC1 is time base circuit, and the model of selecting is: NE555
Time-base integrated circuit IC1 is that 8 pin are the DIP encapsulation, and each pin function: 1 pin is circuit ground GND; 2 pin are trigger end; 3 pin output terminals; 4 pin preset ends; 5 pin are control voltage; 6 pin thresholdings (threshold value); 7 pin are discharge end; 8 pin meet positive source VCC;
VT1 is field effect transistor, and the model of selecting is: 3DJ6;
The resistance of resistance R 1 is 100K Ω; RP is potentiometer, and its resistance is 51K Ω;
The capacity of capacitor C 1 is 0.01 μ F, and the capacity of electrochemical capacitor C2 is 22 μ F/16V;
SP is loudspeaker, selects 3 inches moving-coil speakers, and impedance is 8 Ω;
The 6V direct supply can use the common MnZn dry cell of 4 joints.
Circuit production main points, circuit debugging and use
1. the making of inductive probe TX: inductive probe is selected the above copper cash of ¢ 2.0mm, require appearance that the sheath copper cash of one wrapped with insulation is arranged, inductive probe length 〉=90mm, in order to increase the induction area of inductive probe TX, the sheath copper cash shape of inductive probe TX can be bent into " U " shape;
2. after the element on the whole circuit board welds, weld at last field effect transistor VT1, electric soldering iron is answered ground connection or is dialled lower plug and use during welding field effect transistor VT1, in case electric soldering iron electric leakage or static is arranged and damage field effect transistor VT1, inductive probe TX is welded on the grid G of field effect transistor VT1;
3. the non-contact induction type electricity measurer requires to use metal shell, and requires metal shell and circuit ground GND to join;
4. after the welding of non-contact induction type electricity measurer element is finished and is errorless through inspection, circuit can be connected the 6V direct supply, inductive probe TX is held gradually near the 220V AC power cord, slowly adjust potentiometer RP, and when making inductive probe TX apart from the AC power 10cm left and right sides, when sending rapidly sound explanation non-contact induction type electricity measurer circuit debugging, finishes loudspeaker SP.

Claims (1)

1. non-contact induction type electricity measurer, it is comprised of 6V direct supply, induced signal testing circuit, multi-resonant oscillating circuit and audio output circuit, and its feature comprises:
Described induced signal testing circuit is comprised of inductive probe TX, field effect transistor VT1 and potentiometer RP, the grid G of field effect transistor VT1 meets inductive probe TX, the drain D of field effect transistor VT1 connects the end of potentiometer RP, the anodal VCC of the other end of potentiometer RP and movable end connection circuit thereof, the source S connection circuit ground GND of field effect transistor VT1;
Described multi-resonant oscillating circuit is comprised of time base circuit IC1, capacitor C 1 and resistance R 1, the model that time base circuit IC1 selects is NE555, the 4th pin of time base circuit IC1 connects the drain D of field effect transistor VT1, the 2nd pin of time base circuit IC1 and the 6th pin connect an end of capacitor C 1 and an end of resistance R 1, the 3rd pin of another termination time base circuit IC1 of resistance R 1, the other end connection circuit ground GND of the 1st pin of time base circuit IC1 and capacitor C 1, the anodal VCC of the 8th pin connection circuit of time base circuit IC1;
Described audio output circuit is comprised of electrochemical capacitor C1 and loudspeaker SP, and the 3rd pin of time base circuit IC1 connects the positive pole of electrochemical capacitor C1, and the negative pole of electrochemical capacitor C1 connects the end of loudspeaker SP, the other end connection circuit ground GND of loudspeaker SP;
The anodal VCC of described 6V dc power anode connection circuit, 6V dc power cathode connection circuit ground GND.
CN 201310000544 2013-01-04 2013-01-04 Non-contact-induction-type voltage tester Withdrawn CN103076488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201310000544 CN103076488A (en) 2013-01-04 2013-01-04 Non-contact-induction-type voltage tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201310000544 CN103076488A (en) 2013-01-04 2013-01-04 Non-contact-induction-type voltage tester

Publications (1)

Publication Number Publication Date
CN103076488A true CN103076488A (en) 2013-05-01

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Family Applications (1)

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CN 201310000544 Withdrawn CN103076488A (en) 2013-01-04 2013-01-04 Non-contact-induction-type voltage tester

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103645374A (en) * 2013-12-28 2014-03-19 周芸 Non-contact electricity measurement device
CN107861016A (en) * 2017-11-12 2018-03-30 韦明肯 One kind ground wire disconnects automatic failure alarm device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103645374A (en) * 2013-12-28 2014-03-19 周芸 Non-contact electricity measurement device
CN107861016A (en) * 2017-11-12 2018-03-30 韦明肯 One kind ground wire disconnects automatic failure alarm device

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Application publication date: 20130501