CN206096266U - Electron megohmmeter - Google Patents
Electron megohmmeter Download PDFInfo
- Publication number
- CN206096266U CN206096266U CN201621149460.1U CN201621149460U CN206096266U CN 206096266 U CN206096266 U CN 206096266U CN 201621149460 U CN201621149460 U CN 201621149460U CN 206096266 U CN206096266 U CN 206096266U
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- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- audion
- voltage
- circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides an electron megohmmeter for whether measure insulation resistance or check out test set leaks electricity. It includes oscillation circuit, boost circuit, rectification filter circuit, display element and steady voltage unit, oscillation circuit by operational amplifier A1, resistance R1 R4, electric capacity C1, boost circuit by triode T1, step up transformer B1 constitutes, step up transformer's secondary coil output the high pressrue alternating current, rectification filter circuit carries out the rectifying and wave -filtering as measuring voltage to high voltage alternating current, the steady voltage unit is by tickler, operational amplifier A2, triode T2 constitutes, operational amplifier A2 carries out the comparison with a feedback voltage and a reference voltage, change triode T2's collecting electrode projecting pole equivalent resistance, this equivalent resistance and resistance R4 establish ties mutually, the realization is to "Frequency"'s adjustment, reach secondary coil's steady voltage. This electron megohmmeter's high pressure is produced by the electronic circuit, and its light in weight does not need the manual work to generate electricity during the use, convenient to use, and measurement accuracy is higher.
Description
Technical field
This utility model is related to a kind of electronic megger, for measuring whether insulation resistance or testing equipment leak electricity.
Background technology
Traditional megameter is generally generator-type, and its structure includes hand generator and microampere meter, and its operation principle is,
By boosting to the alternating current that hand generator is produced, its output voltage is applied to the two-stage of measurand, microampere meter string
In being connected on output voltage loop, microampere meter shows the electric current for flowing through measurand, because output voltage is a fixed value, according to Europe
Nurse law can draw the insulation resistance of measurand.The megameter weight of this structure is big, its output voltage and hand generator
Rotating speed is relevant, and the precision of measurement is not high.
The content of the invention
The technical problems to be solved in the utility model is to provide a kind of electronic megger circuit, and it is made up of electronic component
It is lightweight, its output voltage stabilization, with higher certainty of measurement.
The technical solution of the utility model is, a kind of electronic megger, and it includes oscillating circuit, booster circuit, rectification filter
Wave circuit and display unit；It is characterized in that, described oscillating circuit includes operational amplifier A 1, operational amplifier A 1 it is anti-phase
Resistance R1 is connected between input and outfan, the inverting input of operational amplifier A 1 is grounded by electric capacity C1, operation amplifier
Resistance R3 is connected between the in-phase input end and outfan of device A1, the in-phase input end of operational amplifier A 1 connects electricity by resistance R2
Source VDD, one end of the homophase input terminating resistor R4 of operational amplifier A 1, the other end ground connection of resistance R4；Described liter piezoelectricity
Road carries out power amplification and boosting to the output signal of oscillating circuit, and booster circuit includes audion T1, booster transformer B1, and three
The base stage of pole pipe T1 connects the outfan of operational amplifier A 1 by resistance R5, the grounded emitter of audion T1, audion T1's
Colelctor electrode connects power vd D, the high electricity of secondary coil L2 outputs of booster transformer B1 by the primary coil L1 of booster transformer B1
Pressure.
To improve certainty of measurement, described electronic megger circuit also includes a voltage regulation unit, described voltage regulation unit bag
Include feedback coil L3, the operational amplifier A 2 of booster transformer B1, the anode of a terminating diode D2 of feedback coil L3, two poles
The negative electrode of pipe D2 connects the other end of feedback coil L3 by electric capacity C3, and the negative electrode of diode D2 connects operational amplifier by resistance R7
The inverting input of A2, the negative electrode of the homophase input termination stabilivolt DW1 of operational amplifier A 2, the plus earth of stabilivolt DW1,
The in-phase input end of operational amplifier A 2 meets power vd D by resistance R6, and the outfan of operational amplifier A 2 is connect by resistance R8
The base stage of audion T2, the other end of the colelctor electrode connecting resistance R4 of audion T2, the grounded emitter of audion T2.
The characteristics of this electronic megger is that high pressure is produced by electronic circuit, and its is lightweight, need not be artificial when using
Easy to use to generate electricity, the voltage with voltage stabilizing function output is not affected by load change, and certainty of measurement is higher.
Description of the drawings
Fig. 1 is electronic circuit schematic diagram of the present utility model.
Specific embodiment
In conjunction with description of the drawings specific embodiment of the present utility model.
A kind of electronic megger, it includes oscillating circuit, booster circuit, current rectifying and wave filtering circuit and display unit.
Described oscillating circuit includes operational amplifier A 1, and the inverting input of operational amplifier A 1 is with outfan indirectly
The inverting input for having resistance R1, operational amplifier A 1 is grounded by electric capacity C1, the in-phase input end of operational amplifier A 1 with it is defeated
Go out between end and be connected to resistance R3, the in-phase input end of operational amplifier A 1 meets power vd D by resistance R2, operational amplifier A 1
One end of homophase input terminating resistor R4, the other end ground connection of resistance R4, the outfan of operational amplifier A 1 exports square wave letter
Number.
The frequency of oscillation of oscillating circuit is 20KHZ, is realized by selecting the value of resistance R1, R2, R3, R4 and electric capacity C1.
Described booster circuit carries out power amplification and boosting to the output signal of oscillating circuit, and booster circuit includes three poles
Pipe T1, booster transformer B1, the base stage of audion T1 connects the outfan of operational amplifier A 1 by resistance R5, and audion T1's sends out
Emitter grounding, the colelctor electrode of audion T1 passes through one end of the primary coil L1 of booster transformer B1, and primary coil L1's is of the same name
Termination power VDD, the turn ratio of primary coil L1 and secondary coil L2 by arranging booster transformer B1, can make secondary coil
L2 exports the alternating voltage of 250V or 500V, and the core material of booster transformer B1 is ferrite.
Described current rectifying and wave filtering circuit includes diode D1, electric capacity C2, and the anode of diode D1 connects the same of secondary coil L2
Name end, the negative electrode of diode D1 connects the other end of secondary coil L2, the DC measurement of output one at electric capacity C2 two ends by electric capacity C2
Voltage.
Described display unit includes microampere meter M1, resistance R9, and microampere meter M1, resistance R9 are serially connected in DC measurement voltage and return
Lu Zhong.
Described power vd D is the working power of electronic megger, can be that stacking battery is alternatively regulated power supply, its electricity
Press as+9V.
To reduce the consumption of electric energy, button K1 is serially connected with the input end of power vd D, by DC measurement voltage when using
Breakpoint in loop is connected with measured resistance RZ, and then press ＆ hold K1, and microampere meter M1 shows corresponding measured resistance value, surveys
Amount finishes release button K1.
To reduce impact of the size of measured resistance to DC measurement voltage, to improve certainty of measurement, described electronics million
Europe watch circuit also includes a voltage regulation unit, and described voltage regulation unit includes feedback coil L3, the operation amplifier of booster transformer B1
The anode of the Same Name of Ends diode D2 of device A2, feedback coil L3, the negative electrode of diode D2 connects feedback coil L3's by electric capacity C3
The other end, the negative electrode of diode D2 connects the inverting input of operational amplifier A 2, the homophase of operational amplifier A 2 by resistance R7
The negative electrode of input termination stabilivolt DW1, the plus earth of stabilivolt DW1, the in-phase input end of operational amplifier A 2 passes through resistance
R6 meets power vd D, and the outfan of operational amplifier A 2 connects the base stage of audion T2 by resistance R8, and the colelctor electrode of audion T2 connects
The other end of resistance R4, the grounded emitter of audion T2.
Voltage magnitude on booster transformer secondary coil remove with the voltage magnitude of primary coil mutually outside the Pass also with primary line
The electric voltage frequency of circle is related, and when the electric voltage frequency of primary coil rises, the voltage magnitude of primary coil rises, and works as primary coil
Electric voltage frequency when declining the voltage magnitude of primary coil decline, voltage regulation unit realizes voltage stabilizing by frequency modulation.Detailed process is：
Form a feedback voltage after the rectified filtering of voltage of feedback coil L3, the output voltage of the feedback voltage and secondary coil L2 into
Direct ratio, feedback voltage is applied to the inverting input of operational amplifier A 2, and stabilivolt DW1 is the homophase input of operational amplifier A 2
End provides a reference voltage, and when feedback voltage is more than reference voltage, the output end voltage of operational amplifier A 2 declines, audion
Equivalent resistance increase between the colelctor electrode and emitter stage of T2, the frequency of oscillation of oscillating circuit is reduced, the output of secondary coil L2
Voltage declines, and vice versa.
In voltage regulation unit, resistance R2 is equal with the resistance of resistance R3, and the resistance of resistance R4 is the 1/2 of resistance R2 resistances,
Good voltage regulation result can be obtained.
The line construction of voltage regulation unit is simple, and voltage regulation performance is good, can make the voltage magnitude on booster transformer secondary coil
It is stable, load can be eliminated（Measured resistance）The measurement error that change brings.
Claims (3)
1. a kind of electronic megger, it includes oscillating circuit, booster circuit, current rectifying and wave filtering circuit and display unit；Its feature
It is that described oscillating circuit includes operational amplifier A 1, and between the inverting input and outfan of operational amplifier A 1 electricity is connected to
Resistance R1, the inverting input of operational amplifier A 1 is grounded by electric capacity C1, the in-phase input end and outfan of operational amplifier A 1
Between be connected to resistance R3, the in-phase input end of operational amplifier A 1 connects power vd D, the homophase of operational amplifier A 1 by resistance R2
One end of input terminating resistor R4, the other end ground connection of resistance R4；Described booster circuit enters to the output signal of oscillating circuit
Row power amplification and boosting, booster circuit includes audion T1, booster transformer B1, and the base stage of audion T1 is connect by resistance R5
The outfan of operational amplifier A 1, the grounded emitter of audion T1, the colelctor electrode of audion T1 is by booster transformer B1's
Primary coil L1 connects power vd D, the secondary coil L2 output HIGH voltages of booster transformer B1.
2. electronic megger according to claim 1, is characterized in that, electronic megger also includes a voltage regulation unit, described
Voltage regulation unit including booster transformer B1 feedback coil L3, operational amplifier A 2, a terminating diode of feedback coil L3
The anode of D2, the negative electrode of diode D2 connects the other end of feedback coil L3 by electric capacity C3, and the negative electrode of diode D2 passes through resistance
R7 connects the inverting input of operational amplifier A 2, and the homophase input of operational amplifier A 2 terminates the negative electrode of stabilivolt DW1, stabilivolt
The plus earth of DW1, the in-phase input end of operational amplifier A 2 connects power vd D, the output of operational amplifier A 2 by resistance R6
End connects the base stage of audion T2, the other end of the colelctor electrode connecting resistance R4 of audion T2, the transmitting of audion T2 by resistance R8
Pole is grounded.
3. electronic megger according to claim 2, is characterized in that, resistance R2 is equal with the resistance of resistance R3, resistance R4
Resistance for resistance R2 resistances 1/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621149460.1U CN206096266U (en) | 2016-10-29 | 2016-10-29 | Electron megohmmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621149460.1U CN206096266U (en) | 2016-10-29 | 2016-10-29 | Electron megohmmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206096266U true CN206096266U (en) | 2017-04-12 |
Family
ID=58485082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621149460.1U Expired - Fee Related CN206096266U (en) | 2016-10-29 | 2016-10-29 | Electron megohmmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206096266U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249051A (en) * | 2016-10-29 | 2016-12-21 | 高玉琴 | Electronic megger |
-
2016
- 2016-10-29 CN CN201621149460.1U patent/CN206096266U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249051A (en) * | 2016-10-29 | 2016-12-21 | 高玉琴 | Electronic megger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170412 Termination date: 20201029 |