CN201993417U

CN201993417U - High-sensitivity induction electricity measurer with high gear and low gear

Info

Publication number: CN201993417U
Application number: CN2010205990537U
Authority: CN
Inventors: 刘喆
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-11-10
Filing date: 2010-11-10
Publication date: 2011-09-28
Anticipated expiration: 2020-11-10

Abstract

The utility model belongs to the technical field of electronics and electrics and relates to a high-sensitivity induction electricity measurer with a high gear and a low gear. The high-sensitivity induction electricity measurer with a high gear and a low gear is not only suitable for detecting low voltage electricity, but also suitable for detecting the mains voltage with higher electric potential or an object with static electricity. The high-sensitivity induction electricity measurer comprises an inductive electrode A, an inductive electrode B, two groups of composite transistor circuits, a sound and light alarm circuit, a hand-touch electrode, a power filter circuit, a power supply and a power key switch; and the high-sensitivity induction electricity measurer is characterized in that the two groups of the composite transistor circuits are homopolar Darlington circuits and heteropolar Darlington circuits. Only when the test contact head of the traditional test pencil is directly contacted with the charged metal object, and the test pencil can work normally after a complete circuit is formed; and the high-sensitivity induction electricity measurer can normally work without being directly contacted with the charged object, and the charged object can be a metal, an object with static electricity, a COMPUTER CRT (Cathode Ray Tube) display or a color TV tube.

Description

Strong and weak two grades highly sensitive induction type electricity measurer is arranged

Technical field

The utility model belongs to electronics and electrical technology field, relates to a kind of highly sensitive induction type electricity measurer that has strong and weak two grades, and it both had been applicable to the detection low tension, also is applicable to the object of monitoring the higher line voltage of current potential or having static.

Background technology

At present, the structure of known test pencil is to be composed in series by examination electrical contact, current-limiting resistance, neon tube, metal spring and hand touched electrode on the market.Test contact contacts with tested live metal object, and staff contact hand touched electrode constitutes the loop, and when tested metal object had higher voltage relative to the earth, the neon tube starter represented that tested metal object is charged.But, there are the metal shell or the hardware of a lot of electrical appliances not to have in actual use to the adventurous electric shock voltage of human body, only the distributed capacitance induction by electrical appliance metal part produces electromotive force (voltage), general test pencil can not be discerned and be lower than the following induction electromotive force of 80V, whether this leaks electricity for the detection device and brings certain limitation, is easy to cause misjudgment.

Can not discern the deficiency of no dangerous induction electromotive force in order to overcome the existing test pencil in market, develop and a kind ofly can either discern adventurous electric shock voltage, the survey electric installation that also can discern non-hazardous induction electromotive force or static is necessity particularly.

Below describe a kind of correlation technique that strong and weak two grades highly sensitive induction type electricity measurer making is arranged in detail.

The utility model content

Goal of the invention and beneficial effect: the examination electrical contact of traditional test pencil is the contact electrification metal object directly, and making test pencil constitute complete loop could operate as normal.Described in the utility model have strong and weak two grades highly sensitive induction type electricity measurer not need direct contact electrification object to get final product operate as normal, and charged object can be metal or object that has static or non-metallic bodies such as computer CRT monitor, colour kinescope.The utility model both had been suitable for detecting low tension, also was suitable for monitoring the object of higher line voltage of current potential or static electrification, used the hand of must being in a good mood very much, and its effect and function can replace traditional test pencil fully.

Technical characterictic: strong and weak two grades highly sensitive induction type electricity measurer is arranged, form by induction electrode A, induction electrode B, two groups of Darlington circuit, acousto-optic alert circuit, hand touched electrode, electric source filter circuit, power supply and power button switch, it is characterized in that two groups of Darlington circuit use same polarity Darlington circuit, heteropolarity Darlington circuit respectively.

The each several part circuit is formed and the mutual annexation of components and parts

1. the same polarity Darlington circuit is made up of 2 NPN transistor (T1, T2), the base stage of NPN transistor (T1) meets induction electrode A, the emitter of NPN transistor (T1) meets the base stage and the induction electrode B of NPN transistor (T2) respectively, the collector connection circuit VCC of the collector of NPN transistor (T1) and NPN transistor (T2), the emitter of NPN transistor (T2) connects the base stage of NPN transistor (T3).

2. the heteropolarity Darlington circuit is made up of 1 NPN transistor (T3) and 1 PNP transistor (T4), the base stage of NPN transistor (T3) connects the emitter of NPN transistor (T2), the collector of NPN transistor (T3) connects the base stage of PNP transistor (T4), the collector catcher touched electrode (C) of the emitter of NPN transistor (T3) and PNP transistor (T4), the emitter of PNP transistor (T4) connects the acousto-optic alert circuit.

3. the acousto-optic alert circuit is made up of hummer (Y), light emitting diode (D1), the negative pole of one end of hummer (Y) and light emitting diode (D1) connects the emitter of PNP transistor (T4), the anodal connection circuit VCC of the other end of hummer (Y) and light emitting diode (D1).

4. hand touched electrode (C) connects the negative pole of power supply, and power supply is anodal through keyswitch (AN) connection circuit VCC.

5. the extexine of induction electrode A, induction electrode B all is with the blind sleeve pipe of plastic insulation.

Principle of work: after the switch that pushes button (AN) is connected power supply, as induction electrode A (charged object with voltage use when low) or induction electrode B (when voltage is higher, using) when sensing the voltage of testee, induced signal is by NPN+NPN Darlington (T1, T2) and NPN+PNP Darlington (T3, T4) compound amplification, entire circuit forms the loop by hand touched electrode (C), (T1～T4) is in succession after the conducting at 4 transistors, be connected on that hummer (Y) in transistor (T4) emitter will send " too ... " cry, the light emitting diode (D1) that is attempted by hummer (Y) two ends is also lighted simultaneously.Darlington is exactly the Darlington transistor of often saying, circuit uses Darlington transistor, can significantly reduce the requirement of device to driving power, and the enlargement factor of circuit is the product of 4 transistor enlargement factors.

Description of drawings

Accompanying drawing is the circuit working schematic diagram that strong and weak two grades highly sensitive induction type electricity measurer is arranged.

The extexine of induction electrode A, induction electrode B all is with the blind sleeve pipe of plastic insulation; Reference number C in the accompanying drawing is the hand touched electrode, that is: circuit ground.

Embodiment

Technical requirement according to the schematic diagram of circuit working shown in the accompanying drawing and description of drawings and the following stated is implemented, and can realize the utility model.

Component parameter and selection

1. the model of 3 transistor Ts 1, T2, T3 is in the circuit: 2SC9013, and transistor T 4 models are: 2SC9012,4 transistorized β values require 〉=150; Require withstand voltage 〉=60V and high more good more;

2. hummer (Y) requires inside that electronic circuit is arranged, operating voltage: 2.2～2.5V;

3. light emitting diode (D1) is red super bright diode.

Circuit debugging

Circuit working schematic diagram shown in the drawings to specifications, the welding correctness and the welding quality of whole components and parts in the check circuit.It is intact to need only element quality generally speaking, and the circuit welding is errorless, and electricity measurer connects the 3V power supply and gets final product operate as normal.

Because of circuit component seldom, available undersized circuit board is put into all components and parts in plastics small flashlights.Electricity measurer is through actual measurement, and induction electrode A is sensitive especially, and induction electrode A just can sounding, luminous at electricity measurer outside tape insulation layer conductor civil power 1.5cm.With also can sounding, luminous within the induction electrode B induction city electrical distance 1.0cm; Induction electrode A and induction electrode B simultaneously just can sounding, luminous apart from about the computer CRT display screen 10cm, and the distance of the big more induction of computer screen size is far away more.This electricity measurer also has characteristics, can not be subjected to the interference of extraneous light in use and influences, and is very easy to use and directly perceived.

Claims

1. highly sensitive induction type electricity measurer that has strong and weak two grades, be made up of induction electrode A, induction electrode B, two groups of Darlington circuit, acousto-optic alert circuit, hand touched electrode C, electric source filter circuit, power supply and power button switch, it is characterized in that: two groups of Darlington circuit use same polarity Darlington circuit, heteropolarity Darlington circuit respectively.

2. the highly sensitive induction type electricity measurer that has strong and weak two grades according to claim 1, the same polarity Darlington circuit is made up of 2 NPN transistor T1, T2, it is characterized in that: the base stage of NPN transistor T1 meets induction electrode A, the emitter of NPN transistor T1 meets base stage and the induction electrode B of NPN transistor T2 respectively, the collector of the collector of NPN transistor T1 and NPN transistor T2 is with connection circuit VCC, and the emitter of NPN transistor T2 connects the base stage of NPN transistor T3.

3. the highly sensitive induction type electricity measurer that has strong and weak two grades according to claim 1, the heteropolarity Darlington circuit is made up of 1 NPN transistor T3 and 1 PNP transistor T 4, it is characterized in that: the base stage of NPN transistor T3 connects the emitter of NPN transistor T2, the collector of NPN transistor T3 connects the base stage of PNP transistor T 4, the collector of the emitter of NPN transistor T3 and PNP transistor T 4 is with the catcher touched electrode C, and the emitter of PNP transistor T 4 connects the acousto-optic alert circuit.

4. the highly sensitive induction type electricity measurer that has strong and weak two grades according to claim 1, the acousto-optic alert circuit is made up of hummer Y, light emitting diode D1, it is characterized in that: the end of hummer Y and the negative pole of light emitting diode D1 are with the emitter that connects PNP transistor T 4, and the positive pole of the other end of hummer Y and light emitting diode D1 is with connection circuit VCC.

5. the highly sensitive induction type electricity measurer that has strong and weak two grades according to claim 1 is characterized in that the hand touched electrode C connects the negative pole of power supply, connection circuit VCC behind the positive pole process keyswitch AN of power supply.

6. the highly sensitive induction type electricity measurer that has strong and weak two grades according to claim 1 is characterized in that the extexine of induction electrode A, induction electrode B all is with the blind sleeve pipe of plastic insulation.