CN205749762U - A kind of alarm drive circuit for ground wire detector - Google Patents
A kind of alarm drive circuit for ground wire detector Download PDFInfo
- Publication number
- CN205749762U CN205749762U CN201620639575.2U CN201620639575U CN205749762U CN 205749762 U CN205749762 U CN 205749762U CN 201620639575 U CN201620639575 U CN 201620639575U CN 205749762 U CN205749762 U CN 205749762U
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- Prior art keywords
- resistance
- amplifier
- outfan
- inverting input
- ground wire
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Abstract
The utility model discloses a kind of alarm drive circuit for ground wire detector, alarm signal input the first resistance in parallel and the first electric capacity are connected to the inverting input of the first amplifier, the normal phase input end of the first amplifier passes through the second resistance eutral grounding, the inverting input of the first amplifier is connected to the outfan of the first amplifier by the 3rd resistance connected and the second electric capacity, the outfan of the first amplifier is connected to the inverting input of the second amplifier by the 4th resistance, the inverting input of the second amplifier is connected to the outfan of the second amplifier by the 5th resistance, the normal phase input end of the second amplifier is connected to datum by the 6th resistance, the normal phase input end of the second amplifier passes through the 7th resistance eutral grounding.This utility model can improve the deficiencies in the prior art, improves the capacity of resisting disturbance of the alarm drive circuit of ground wire detector.
Description
Technical field
This utility model relates to a kind of safety monitoring assembly, and a kind of warning for ground wire detector drives
Circuit.
Background technology
In power system, dielectric oil dielectrical strength tester is a kind of indispensability of detecting insulating oil breakdown voltage strength
Instrument and equipment, but the output voltage of this kind of instrument is higher, in order to protect the personal safety of operator and ensure equipment
Normal work, this kind of instrument is fitted with earthing rod under normal circumstances needs well to be connected to ground wire, and instrument typically self will not
Detect whether really ground connection and invariably grounding alarm function, thus result in earthing rod and perform practically no function, it is impossible to reach equipment good
The purpose of good earth lead.In addition, lack of standardization, it is possible that live wire L line and zero line N line connect anti-due to power wiring
Phenomenon but alarm free prompting, it is possible to can cause that equipment cabinets is charged causes certain harm to operator.Under normal circumstances,
It is to realize the monitoring for dielectric oil dielectrical strength tester whether good earth by external ground wire detector.But
It is that the capacity of resisting disturbance of the alarm drive circuit of existing ground wire detector is more weak, malfunctioning problem of reporting to the police easily occurs.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of alarm drive circuit for ground wire detector,
Can solve the problem that the deficiencies in the prior art, improve the capacity of resisting disturbance of the alarm drive circuit of ground wire detector.
For solving above-mentioned technical problem, technical solution adopted in the utility model is as follows.
A kind of alarm drive circuit for ground wire detector, alarm signal input the first resistance in parallel
With the inverting input that the first electric capacity is connected to the first amplifier, the normal phase input end of the first amplifier passes through the second resistance eutral grounding, the
The inverting input of one amplifier is connected to the outfan of the first amplifier, the first amplifier by the 3rd resistance connected and the second electric capacity
Outfan be connected to the inverting input of the second amplifier by the 4th resistance, the inverting input of the second amplifier is by the 5th electricity
Resistance is connected to the outfan of the second amplifier, and the normal phase input end of the second amplifier is connected to datum by the 6th resistance, and second
The normal phase input end of amplifier passes through the 7th resistance eutral grounding, and the outfan of the second amplifier is connected to the base of audion by the 8th resistance
Pole, the outfan of the first amplifier is connected to the inverting input of the 3rd amplifier by the 9th resistance connected and the tenth resistance, the
By the 3rd capacity earth between nine resistance and the tenth resistance, the inverting input of the 3rd amplifier the 11st resistance in parallel
With the outfan that the 4th electric capacity is connected to the 3rd amplifier, the positive input of the 3rd amplifier pass through the 12nd resistance eutral grounding, the 3rd
The outfan of amplifier is connected to the colelctor electrode of audion by the 13rd resistance, the emitter stage of audion the 5th electricity by series connection
Holding and the 14th resistance eutral grounding, the emitter stage of audion is connected to alarm signal output ends by the 15th resistance.
What employing technique scheme was brought has the beneficial effects that: this utility model passes through the first amplifier to alarm signal
Carry out current stabilization, then by the second amplifier, signal amplitude is adjusted, be allowed to control the amplification coefficient of audion.Carry out current stabilization
After signal after process is filtered by the 3rd amplifier, it is amplified by audion, then exports.Outfan passes through
Arrange the distortion effect that filtering unit produces for signal for audion itself to filter.This driving circuit structure is simple,
Stability is strong, can be effectively improved the warning accuracy of ground wire detector.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of one detailed description of the invention of this utility model.
In figure: R1, the first resistance；R2, the second resistance tube；R3, the 3rd resistance；R4, the 4th resistance；R5, the 5th resistance；
R6, the 6th resistance；R7, the 7th resistance；R8, the 8th resistance；R9, the 9th resistance；R10, the tenth resistance；R11, the 11st resistance；
R12, the 12nd resistance；R13, the 13rd resistance；R14, the 14th resistance；R15, the 15th resistance；C1, the first electric capacity；C2,
Two electric capacity；C3, the 3rd electric capacity；C4, the 4th electric capacity；C5, the 5th electric capacity；VCC, datum；Q, audion；A1, the first amplifier；
A2, the second amplifier；A3, the 3rd amplifier；IN, alarm signal input；OUT, alarm signal output ends.
Detailed description of the invention
With reference to Fig. 1, the alarm signal input IN of one detailed description of the invention of this utility model the first electricity in parallel
Resistance R1 and the first electric capacity C1 is connected to the inverting input of the first amplifier A1, and the normal phase input end of the first amplifier A1 is by the second electricity
Resistance R2 ground connection, the inverting input of the first amplifier A1 is connected to the first amplifier by the 3rd resistance R3 and the second electric capacity C2 of series connection
The outfan of A1, the outfan of the first amplifier A1 is connected to the inverting input of the second amplifier A2 by the 4th resistance R4, and second
The inverting input of amplifier A2 is connected to the outfan of the second amplifier A2 by the 5th resistance R5, the positive input of the second amplifier A2
End is connected to datum VCC by the 6th resistance R6, and the normal phase input end of the second amplifier A2 passes through the 7th resistance R7 ground connection, the
The outfan of two amplifiers A2 is connected to the base stage of audion Q by the 8th resistance R8, and the outfan of the first amplifier A1 is by series connection
The 9th resistance R9 and the tenth resistance R10 be connected to the inverting input of the 3rd amplifier A3, the 9th resistance R9 and the tenth resistance R10
Between by the 3rd electric capacity C3 ground connection, the inverting input of the 3rd amplifier A3 the 11st resistance R11 and the 4th electricity in parallel
Holding C4 and be connected to the outfan of the 3rd amplifier A3, the positive input of the 3rd amplifier A3 passes through the 12nd resistance R12 ground connection, and the 3rd
The outfan of amplifier A3 is connected to the colelctor electrode of audion Q by the 13rd resistance R13, and the emitter stage of audion Q is by series connection
The 5th electric capacity C5 and the 14th resistance R14 ground connection, the emitter stage of audion Q is connected to alarm signal by the 15th resistance R15
Number outfan OUT.
Wherein, the first resistance R1 be 75k Ω, the second resistance R2 be 200k Ω, the 3rd resistance R3 be 50k Ω, the 4th resistance
R4 is 60k Ω, and the 5th resistance R5 is 80k Ω, and the 6th resistance R6 is 80k Ω, the 7th resistance R7 is 150k Ω, the 8th resistance R8 is
30k Ω, the 9th resistance R9 are 35k Ω, the tenth resistance R10 is 70k Ω, the 11st resistance R11 is that the 40, the 12nd resistance R12 is
100k Ω, the 13rd resistance R13 are 50k Ω, the 14th resistance R14 is 230k Ω, the 15th resistance R15 is 90k Ω.First electricity
Holding C1 is 80 μ F, and the second electric capacity C2 is 120 μ F, and the 3rd electric capacity C3 is 350 μ F, and the 4th electric capacity C4 is 65 μ F, and the 5th electric capacity C5 is
500 μ F, datum VCC are 5V.
The detection device of dielectric oil dielectrical strength tester earth lead includes circuit board, audible-visual annunciator and luminous alarm
Device, drive circuit described in the utility model is used for driving audible-visual annunciator and light-emitting alarm.By relevant components and parts and zero
Part designs on one piece of circuit board, and circuit board, audible-visual annunciator and light-emitting alarm are fixed on dielectric oil dielectrical strength test
Instrument cabinet inside, circuit board running voltage 5V or 12V by tester Switching Power Supply provide, circuit board running voltage access point and
Running voltage can directly be connected at the power switch power supply of tester with reference to access point, and limit switch access point concatenation accesses test
In limit switch loop at instrument case lid, ground wire E, zero line N, live wire L access point are electrically accessed supply socket phase with the city of tester
Even, audible-visual annunciator access point connects audible-visual annunciator, light-emitting alarm access point sending and receiving light crossing-signal, live wire L and ground wire E it
Between connect have commutation diode, current-limiting resistance and photo-coupler, between zero line N and ground wire E connect light-emitting alarm, rectification two
Pole pipe and current-limiting resistance.
Being connected between live wire L with ground wire E and have commutation diode, current-limiting resistance, photo-coupler, single-chip microcomputer is adopted by detection
The level state of the colelctor electrode of sample audion determines that tester has connected ground wire, if tester is connected to ground wire, and fire
Line L and ground wire E forms loop by commutation diode, current-limiting resistance, photo-coupler, when the voltage of sine wave change reaches certain
During value, certain Weak current between live wire L and ground wire E, is had to drive photo-coupler conducting, photo-coupler conducting rear drive sampling
Triode ON, the current collection extremely low level of audion of now sampling, otherwise just end, current collection extremely high level, pass through monolithic
Function detects the change having low and high level on the colelctor electrode of sampling audion, if can't detect height within a certain period of time
The change of level, illustrates that tester ground wire does not access, if be detected that tester does not access ground wire, single-chip microcomputer is by driving
Circuit controls audible-visual annunciator and sends alarm, and prompting operator note, and only this is alert after tester actual access ground wire
Report just can release, and single-chip microcomputer controls relay by protection audion simultaneously, will be connected to limit switch at tester case lid
Detection path is opened, so when tester proceeds by Breakdown Voltage Test of Insulation Oil, owing to detecting that tester case lid limits
Bit switch is in open mode, then the high pressure of tester will not export, it is ensured that the safety of operator.At zero line and ground wire
Between connect light-emitting alarm, commutation diode and current-limiting resistance, because of between zero line and ground wire for approximation isoelectric level, so luminous
Alarm is idle, when occurring live wire to connect anti-situation with zero line, has voltage, luminous alarm between live wire and ground wire
Device works under the driving of drive circuit, will carry out luminous alarm.
Of the present utility model ultimate principle and principal character and of the present utility model advantage have more than been shown and described.One's own profession
Skilled person will appreciate that of industry, this utility model is not restricted to the described embodiments, described in above-described embodiment and description
Principle of the present utility model is simply described, on the premise of without departing from this utility model spirit and scope, this utility model is also
Have various changes and modifications, in the range of these changes and improvements both fall within claimed this utility model.This utility model
Claimed scope is defined by appending claims and equivalent thereof.
Claims (1)
1. the alarm drive circuit for ground wire detector, it is characterised in that: alarm signal input (IN) passes through
First resistance (R1) in parallel and the first electric capacity (C1) are connected to the inverting input of the first amplifier (A1), the first amplifier (A1)
Normal phase input end passes through the second resistance (R2) ground connection, and the inverting input of the first amplifier (A1) is by the 3rd resistance (R3) of series connection
With the outfan that the second electric capacity (C2) is connected to the first amplifier (A1), the outfan of the first amplifier (A1) passes through the 4th resistance (R4)
Being connected to the inverting input of the second amplifier (A2), the inverting input of the second amplifier (A2) is connected to by the 5th resistance (R5)
The outfan of the second amplifier (A2), the normal phase input end of the second amplifier (A2) is connected to datum by the 6th resistance (R6)
(VCC), the normal phase input end of the second amplifier (A2) passes through the 7th resistance (R7) ground connection, and the outfan of the second amplifier (A2) is by the
Eight resistance (R8) are connected to the base stage of audion (Q), the outfan of the first amplifier (A1) by series connection the 9th resistance (R9) and
Tenth resistance (R10) is connected to the inverting input of the 3rd amplifier (A3), logical between the 9th resistance (R9) and the tenth resistance (R10)
Cross the 3rd electric capacity (C3) ground connection, the inverting input of the 3rd amplifier (A3) the 11st resistance (R11) in parallel and the 4th electricity
Holding (C4) and be connected to the outfan of the 3rd amplifier (A3), the positive input of the 3rd amplifier (A3) passes through the 12nd resistance (R12)
Ground connection, the outfan of the 3rd amplifier (A3) is connected to the colelctor electrode of audion (Q), audion (Q) by the 13rd resistance (R13)
Emitter stage by the 5th electric capacity (C5) of series connection and the 14th resistance (R14) ground connection, the emitter stage of audion (Q) is by the tenth
Five resistance (R15) are connected to alarm signal output ends (OUT).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620639575.2U CN205749762U (en) | 2016-06-24 | 2016-06-24 | A kind of alarm drive circuit for ground wire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620639575.2U CN205749762U (en) | 2016-06-24 | 2016-06-24 | A kind of alarm drive circuit for ground wire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205749762U true CN205749762U (en) | 2016-11-30 |
Family
ID=57384981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620639575.2U Expired - Fee Related CN205749762U (en) | 2016-06-24 | 2016-06-24 | A kind of alarm drive circuit for ground wire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205749762U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976606A (en) * | 2018-01-06 | 2018-05-01 | 河北农业大学 | Leakage protection monitoring device and detection method thereof |
| CN113567881A (en) * | 2021-06-24 | 2021-10-29 | 宁波方太厨具有限公司 | Working method for reducing false alarm leakage fault of cleaning machine |
-
2016
- 2016-06-24 CN CN201620639575.2U patent/CN205749762U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976606A (en) * | 2018-01-06 | 2018-05-01 | 河北农业大学 | Leakage protection monitoring device and detection method thereof |
| CN107976606B (en) * | 2018-01-06 | 2020-05-26 | 河北农业大学 | Leakage protection monitoring device and detection method thereof |
| CN113567881A (en) * | 2021-06-24 | 2021-10-29 | 宁波方太厨具有限公司 | Working method for reducing false alarm leakage fault of cleaning machine |
| CN113567881B (en) * | 2021-06-24 | 2022-11-11 | 宁波方太厨具有限公司 | Working method for reducing false alarm of electric leakage fault of cleaning machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20180624 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |