CN204405770U

CN204405770U - Capacitive property detecting device

Info

Publication number: CN204405770U
Application number: CN201520130559.6U
Authority: CN
Inventors: 黄宇嵩
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-03-07
Filing date: 2015-03-07
Publication date: 2015-06-17
Anticipated expiration: 2025-03-07

Abstract

The utility model discloses a kind of capacitive property detecting device, its feature comprises: 9V direct supply, multi-resonant oscillating circuit, level power are amplified and display circuit, capacity measurement interface circuit, and the model that the hex inverter IC1 in described multi-resonant oscillating circuit selects is CD4069.The capacitance measuring instrument of specialty is all difficult to be equipped with for general electronic working personnel or amateurish electrophile.In order to solve the general specification of capacitance measurement, the circuit of capacitive property detecting device described in the utility model uses common components and parts, it is simple that circuit has structure, be applicable to the performance of measurement capacity at the various electric capacity of 1PF ~ 1 μ F, can the open circuit of Detection capacitance, the slight problem such as short circuit or short circuit, utilize the whether luminous cardinal principle performance judging electric capacity of common light emitting diode.

Description

Capacitive property detecting device

Technical field

The utility model belongs to electronic component field of measuring technique, is about a kind of capacitive property detecting device.

Background technology

When designing, making various electronic installation, first will check all components and parts, wherein electric capacity is one of object of emphasis inspection.Check that capacitive property is cumbersome with pointer multimeter, need certain practical experience, otherwise not easily accomplish correct judgement, and professional capacitance measuring instrument is all difficult to be equipped with for general electronic working personnel or amateurish electrophile.In order to solve the general specification of capacitance measurement, the circuit of capacitive property detecting device described in the utility model uses common components and parts, it is simple that circuit has structure, be applicable to the performance of measurement capacity at the various electric capacity of 1pF ~ 1 μ F, can the open circuit of Detection capacitance, the slight problem such as short circuit or short circuit, utilize the whether luminous cardinal principle performance judging electric capacity of common light emitting diode.

Below describe in detail capacitive property detecting device described in the utility model necessity involved in implementation process, guardian technique content.

Utility model content

Goal of the invention and beneficial effect: professional capacitance measuring instrument is all difficult to be equipped with for general electronic working personnel or amateurish electrophile.In order to solve the general specification of capacitance measurement, the circuit of capacitive property detecting device described in the utility model uses common components and parts, it is simple that circuit has structure, be applicable to the performance of measurement capacity at the various electric capacity of 1PF ~ 1 μ F, can the open circuit of Detection capacitance, the slight problem such as short circuit or short circuit, utilize the whether luminous cardinal principle performance judging electric capacity of common light emitting diode.

Circuit working principle: the circuit of capacitive property detecting device forms multi-resonant oscillating circuit by elements such as two phase inverter G1, the phase inverter G2 in CMOS hex inverter CD4069, oscillation frequency is decided by the size of electric capacity C1, measured capacitance CX and resistance R3, and general frequency is in a few KHz.When measured capacitance CX is functional, circuit produces vibration, and oscillator signal is exported by phase inverter G2, after phase inverter G3, phase inverter G4 isolation, red light emitting diodes LED is lighted.When measured capacitance CX internal break, circuit not starting of oscillation.Due to the effect of biasing resistor R1, make the both end voltage of phase inverter G1 have larger difference, thus make the output level of phase inverter G2 higher, reach about 6.5V.After level two phase inverter G3, phase inverter G4 parallel power amplify, it exports as low level, and LED does not work.When measured capacitance CX internal short-circuit or slight short circuit, then the higher level of phase inverter G2 output terminal makes the input end of phase inverter G1 be high level by switching diode D1, thus phase inverter G2 output is also high level, phase inverter G3, phase inverter G4 output low level, LED does not work.Switching diode D1 is that when preventing testing capacitor short circuit, the high level that phase inverter G1 may export is added to the output terminal of phase inverter G2 by resistance R3, makes LED shinny and produces erroneous judgement.

Technical characteristic: capacitive property detecting device, it comprises 9V direct supply, multi-resonant oscillating circuit, level power amplification and display circuit, capacity measurement interface circuit, it is characterized in that:

Multi-resonant oscillating circuit: it is by hex inverter IC1, resistance R1, resistance R2, resistance R3, electric capacity C1 and switching diode D1 forms, the model that hex inverter IC1 selects is CD4069, the 14th pin connection circuit positive pole VCC of hex inverter IC1, one end of the 3rd pin connecting resistance R1 of hex inverter IC1 and one end of resistance R2, the other end connection circuit positive pole VCC of resistance R1, the negative pole of another termination switching diode D1 of resistance R2, 4th pin of hex inverter IC1 connects the 5th pin of hex inverter IC1 and one end of resistance R3, the negative pole of another termination switching diode D1 of resistance R3 and one end of electric capacity C1, the positive pole of switching diode D1 connects the other end of electric capacity C1, the 7th pin connection circuit ground GND of hex inverter IC1, 6th pin of hex inverter IC1 connects level power and amplifies and display circuit,

Level power is amplified and display circuit: the 6th pin of hex inverter IC1 connects the 9th pin of hex inverter IC1 and the 11st pin of hex inverter IC1, one end of 8th pin of hex inverter IC1 and the 10th pin connecting resistance R4 of hex inverter IC1, the other end of resistance R4 connects the positive pole of LED, the negative pole connection circuit ground GND of LED;

Capacity measurement interface circuit: test interface terminal TX1 connects the 9th pin of hex inverter IC1 and the 11st pin of hex inverter IC1, test interface terminal TX2 connects the positive pole of switching diode D1, test interface terminal TX1 connects one end of measured capacitance CX, and test interface terminal TX2 connects the other end of measured capacitance CX;

The positive pole connection circuit positive pole VCC of 9V direct supply, the negative pole connection circuit ground GND of 9V direct supply.

Accompanying drawing explanation

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a capacitive property detecting device; The 14th pin connection circuit positive pole VCC of the 7th pin connection circuit ground GND, the hex inverter IC1 of hex inverter IC1; Test interface terminal TX1 connects one end of measured capacitance CX, and test interface terminal TX2 connects the other end of measured capacitance CX;

Embodiment

According to the capacitive property detector circuit fundamental diagram shown in accompanying drawing 1 and accompanying drawing explanation, and according to annexation between components and parts in each several part circuit described in utility model content, and components and parts technical parameter described in embodiment requires and circuit production main points are carried out enforcement and can be realized the utility model, is further described correlation technique of the present utility model below in conjunction with embodiment.

The technical parameter of components and parts and selection requirement

IC1 is hex inverter, and the model selected is CD4069, also can use TC4069; Six identical phase inverters of structure are had in CD4069 chip, have 14 pins, its packing forms is DIP, the present embodiment only uses four phase inverters wherein, that is: phase inverter G1, phase inverter G2, phase inverter G3 and phase inverter G4, its the 7th pin connection circuit ground GND, its 14th pin connection circuit positive pole VCC;

D1 is switching diode, and the model selected is 1N4148;

LED is light emitting diode, selects red high-brightness light emitting diode;

Resistance all selects RTX-1/8W type carbon resister, and the resistance of resistance R1 is 3.3M Ω, and the resistance of resistance R2 is 100k Ω, and the resistance of resistance R3 is 43k Ω, and the resistance of resistance R2 is 620 Ω;

C1 is electric capacity, selects Leaded Ceramic Disc Capacitor, and its capacity is 2200pF;

DC is 9V is direct supply, because circuit power consumption is minimum, can use 9V laminated cell.

Circuit production main points, circuit debugging and using method

Because the circuit structure of capacitive property detecting device is fairly simple, as long as the electronic devices and components performance generally selected is intact, and the components and parts annexation to specifications in accompanying drawing 1 is welded, physical connection line and welding quality are through carefully checking correctly, and circuit of the present utility model does not substantially need to carry out any debugging and can normally work;

The element used due to capacitive property detector circuit is little, thus can put in plastic casing by all components and parts with small-sized circuit board;

Circuit ON 9V direct supply, the resistance of adjusting resistance R1, makes the output end voltage of phase inverter G2 be about 6.5V, then resistance R1 is changed fixed resistance welds.With several, performance is intact and the electric capacity that capacity is different accesses capacity measurement interface respectively, as: LED can be lighted, then make complete;

When using capacitive property detecting device, if LED is not glittering, represents electric capacity inside broken string or damage; If the glittering rear luminosity of LED is only dimmed, instead of extinguish, represent that electric capacity inside exists electric leakage; If LED Chang Liang does not extinguish, represent the short circuit of electric capacity inside.

Circuit components layout of the present utility model, circuit structure design, its shape and size etc. of outward appearance are not all gordian techniquies of the present utility model; neither the claimed technology contents of the utility model; because not affecting the utility model specific implementation process, therefore do not illustrate one by one in the description.

Claims

1. a capacitive property detecting device, it comprises 9V direct supply, multi-resonant oscillating circuit, level power amplification and display circuit, capacity measurement interface circuit, it is characterized in that:

Described multi-resonant oscillating circuit is by hex inverter IC1, resistance R1, resistance R2, resistance R3, electric capacity C1 and switching diode D1 forms, the model that hex inverter IC1 selects is CD4069, the 14th pin connection circuit positive pole VCC of hex inverter IC1, one end of the 3rd pin connecting resistance R1 of hex inverter IC1 and one end of resistance R2, the other end connection circuit positive pole VCC of resistance R1, the negative pole of another termination switching diode D1 of resistance R2, 4th pin of hex inverter IC1 connects the 5th pin of hex inverter IC1 and one end of resistance R3, the negative pole of another termination switching diode D1 of resistance R3 and one end of electric capacity C1, the positive pole of switching diode D1 connects the other end of electric capacity C1, the 7th pin connection circuit ground GND of hex inverter IC1, 6th pin of hex inverter IC1 connects level power and amplifies and display circuit,

Described level power is amplified and in display circuit, 6th pin of hex inverter IC1 connects the 9th pin of hex inverter IC1 and the 11st pin of hex inverter IC1, one end of 8th pin of hex inverter IC1 and the 10th pin connecting resistance R4 of hex inverter IC1, the other end of resistance R4 connects the positive pole of LED, the negative pole connection circuit ground GND of LED;

Described capacity measurement interface circuit, test interface terminal TX1 connects the 9th pin of hex inverter IC1 and the 11st pin of hex inverter IC1, test interface terminal TX2 connects the positive pole of switching diode D1, test interface terminal TX1 connects one end of measured capacitance CX, and test interface terminal TX2 connects the other end of measured capacitance CX;

The positive pole connection circuit positive pole VCC of described 9V direct supply, the negative pole connection circuit ground GND of 9V direct supply.