CN205844395U - A kind of DC current on-line detecting system - Google Patents
A kind of DC current on-line detecting system Download PDFInfo
- Publication number
- CN205844395U CN205844395U CN201620800491.2U CN201620800491U CN205844395U CN 205844395 U CN205844395 U CN 205844395U CN 201620800491 U CN201620800491 U CN 201620800491U CN 205844395 U CN205844395 U CN 205844395U
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- China
- Prior art keywords
- resistance
- connects
- operational amplifier
- polar capacitor
- 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.)
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Abstract
This utility model belongs to DC current online measuring technique field, it is specifically related to a kind of DC current on-line detecting system, including circuit to be detected, circuit tester and red/black meter pen, it is characterized in that: also include signal enlarging instrument, being provided with two probe interfaces for inserting red test pencil and black meter pen in described circuit to be detected, said two probe interface connects two detection resistance being in parallel respectively；Described signal enlarging instrument one end is provided with the red test pencil for being connected and black meter pen with two probe interfaces, and the other end is provided with the red test pencil contact pin for being connected and black meter pen contact pin with circuit tester.This utility model is simple to operate, easy to use, certainty of measurement is high.
Description
Technical field
This utility model belongs to DC current online measuring technique field, is specifically related to a kind of DC current on-line checking system
System.
Background technology
In industry spot, there is a lot of place, in process of production it should be understood that DC current size when equipment runs, existing
Some DC detecting devices have the following disadvantages, and install operating process complexity, and the local time in of especially needing to detect a lot of, performance is more
For substantially, and existing DC detecting installation cost is high, and the error in data detected is relatively big, and even electric current is too small inspection also occurs
Situation about not measuring.
Utility model content
The purpose of this utility model is to provide a kind of DC current simple to operate, easy to use, that certainty of measurement is high to exist
Line detecting system.
For achieving the above object, this utility model is by the following technical solutions: a kind of DC current on-line detecting system, bag
Include circuit to be detected, circuit tester and red/black meter pen, it is characterised in that: also include signal enlarging instrument, described circuit to be detected sets
Having two probe interfaces for inserting red test pencil and black meter pen, said two probe interface connects two inspections being in parallel respectively
Measuring resistance；Described signal enlarging instrument one end is provided with the red test pencil interface for being connected with red test pencil and black meter pen and black meter pen connects
Mouthful, the other end is provided with the red test pencil contact pin for being connected and black meter pen contact pin with circuit tester.
Described signal enlarging instrument includes power supply, on and off switch, virtual earth bleeder circuit and discharge circuit, described positive source with
On and off switch the first end connects, and on and off switch the second end is connected with power cathode and virtual earth bleeder circuit respectively, virtual earth dividing potential drop electricity
Road is connected with the input of discharge circuit, and the outfan of discharge circuit connects red test pencil contact pin and black meter pen contact pin, discharge circuit
Inverting input connect red test pencil interface and black meter pen interface.
Described on and off switch the first end also positive pole with the 5th polar capacitor is connected, the negative pole of the 5th polar capacitor and power supply
Negative pole connects.
Described virtual earth bleeder circuit includes the first polar capacitor, the second polar capacitor, the first resistance and the second resistance, described
The positive pole of the first polar capacitor connects on and off switch the second end, the minus earth of the first polar capacitor；Described second polar capacitor
Plus earth, the negative pole of the second polar capacitor connects power cathode；Described first resistance the first termination power switchs the second end, and first
Resistance the second end ground connection；Described second resistance the first end ground connection, second resistance the second termination power negative pole, the first of the first resistance
Second end of end and the second resistance is connected with the input of discharge circuit.
Described discharge circuit includes operational amplifier, and the earth terminal of described operational amplifier and the second end of the second resistance are even
Connecing, the positive supply of operational amplifier terminates the first end of the first resistance, and the zeroing end of operational amplifier connects zero-regulator resistor two ends,
Described zero-regulator resistor sliding end is connected with operational amplifier positive power source terminal；The normal phase input end of operational amplifier passes through the 6th electric capacity
Ground connection, the positive input of operational amplifier passes through the 3rd resistance eutral grounding, and the reverse input end of operational amplifier connects the 4th electricity
First end of resistance, described 4th resistance the second end connects red test pencil interface, and the reverse input end of operational amplifier connects the 7th electricity
The first end held, described 7th electric capacity the second end connects black meter pen interface, described 7th electric capacity the second end ground connection；Operational amplifier
Reverse input end connect the first end of potentiometer, the second end of described potentiometer and sliding end connect after with operational amplifier
Outfan connects；Potentiometer two ends the 4th electric capacity in parallel；The outfan of operational amplifier connects red test pencil contact pin, operational amplifier
Outfan and the 3rd polar capacitor positive pole connect, described 3rd polar capacitor negative pole connect black meter pen contact pin, the 3rd polarity electricity
The minus earth held.
Also include that power indicating circuit, described power indicating circuit include light emitting diode and the 5th resistance, light-emitting diodes
The positive pole of pipe connects on and off switch the second end by the 5th resistance, and light emitting diode negative pole is connected with power cathode.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Detailed description of the invention
The utility model discloses a kind of DC current on-line detecting system, as it is shown in figure 1, include circuit to be detected, ten thousand
With table and red/black meter pen, circuit to be detected is provided with two probe interfaces (A/B) for inserting red test pencil and black meter pen, two
Individual probe interface (A/B) is connected to two the detection resistance (R11, R21) two being in parallel being serially connected with in circuit to be detected
End, uses the mode that two detections resistance (R11, R21) are in parallel, it is possible to reduce detection resistance (R11, R21) self-heating amount, fall
The rate of change of low resistance, improves the precision and stability of measurement data.
This utility model also includes that signal enlarging instrument, signal enlarging instrument one end are provided with for being connected with two probe interfaces
Red test pencil and black meter pen, the other end is provided with the red test pencil contact pin for being connected and black meter pen contact pin with circuit tester.
Signal enlarging instrument includes power supply BT1, on and off switch S1, virtual earth bleeder circuit and discharge circuit, and power supply BT1 uses 9V
Battery is powered, and power supply BT1 positive pole is connected with on and off switch S1 the first end, on and off switch S1 the second end and the 5th polar capacitor C5's
Positive pole connects, and the negative pole of the 5th polar capacitor C5 is connected with power supply BT1 negative pole；On and off switch S1 the second end passes through the 5th resistance R5
The positive pole of connecting luminous diode LED1, LED 1 negative pole is connected with power supply BT1 negative pole, and LED 1 is
Power supply indicator, LED 1 and the 5th resistance R5 forms power indicating circuit, when on and off switch S1 closes, power supply
BT1 provides working power for signal enlarging instrument, and LED 1 is bright.
Virtual earth bleeder circuit, for the 9V voltage that power supply provides is divided into positive and negative 4.5V voltage, provides positive and negative for discharge circuit
4.5V power supply.Virtual earth bleeder circuit includes the first polar capacitor C1, the second polar capacitor C2, the first resistance R1 and the second resistance
R2, the positive pole of the first polar capacitor C1 connects power supply BT1 positive pole, the minus earth of the first polar capacitor C1；Second polar capacitor C2
Plus earth, the negative pole of the second polar capacitor C2 connects power supply BT1 negative pole, the first polar capacitor C1 and the second polar capacitor C2 string
Connection；First resistance R1 the first termination power BT1 positive pole, first resistance R1 the second end ground connection；Second resistance R2 the first end ground connection, the
Two resistance R2 the second termination power negative poles.
Discharge circuit includes that operational amplifier U1, operational amplifier U1 use OP07 power amplifier chip, operational amplifier
The pin angle 4 of U1 is connected with second end of the second resistance R2, and the pin 7 of operational amplifier U1 is with electric first resistance R1 the first end even
Connecing, the zeroing end (pin 1, pin 8) of operational amplifier U1 connects the two ends of zero-regulator resistor RW1, the sliding end of zero-regulator resistor RW1
Being connected with the pin 7 of operational amplifier U1, zero-regulator resistor RW1 is used for exporting zeroing, and the pin 7 of operational amplifier U1 is also connected with
The positive pole of one polar capacitor C1.The pin 3 of operational amplifier U1 is by the 6th electric capacity C6 ground connection, the pin 3 of operational amplifier U1
By the 3rd resistance R3 ground connection, the pin 2 of operational amplifier U1 connects red test pencil interface, operational amplifier by the 4th resistance R4
The pin 2 of U1 is also connected with first end of the 7th electric capacity C7, and the 7th electric capacity C7 the second end connects black meter pen interface, the 7th electric capacity C7 the
Two end ground connection；The pin 2 of operational amplifier U1 connects first end of potentiometer RW2, second end of potentiometer RW2 and sliding end even
Being connected with the outfan (pin 6) of operational amplifier U1 after connecing, the 4th electric capacity C4 is connected in parallel on potentiometer RW2 two ends, potentiometer RW2
For regulating voltage amplification factor；The outfan (pin 6) of operational amplifier U1 connects red test pencil contact pin, operational amplifier U1's
Pin 6 is connected with the 3rd polar capacitor C3 positive pole, and the 3rd polar capacitor C3 negative pole connects black meter pen contact pin, the 3rd polar capacitor C3
Minus earth.Voltage signal after amplification passes to general-purpose by red/black meter pen contact pin after the 3rd polar capacitor C3 filtering
Table.This signal enlarging instrument volume is little, and easy to carry, power consumption is little, and 9V power supply can use for a long time, with circuit tester with the use of
Can the most accurately detect DC current, certainty of measurement is high, is particularly suitable for industry spot and uses.
During use, the red/black meter pen contact pin on signal enlarging instrument is correctly inserted into contact pin corresponding on circuit tester and connects
Mouthful, red/black meter pen interface that red/black meter pen is correctly connected on signal enlarging instrument, then red/black meter pen probe is correctly inserted into
On probe interface (A, B) on circuit to be detected, now, the small voltage in detection resistance (R11, R21) is through signal enlarging instrument
Being amplified, the voltage after amplification shows after the 3rd polar capacitor C3 filtering on circuit tester, and staff is the most permissible
Learn the ohmically magnitude of voltage of the detection in circuit to be detected, thus indirectly learn current values size.This utility model is measured
Precision is high, and especially the signal enlarging instrument volume in this utility model is little, be easy to carry.
Claims (6)
1. a DC current on-line detecting system, including circuit to be detected, circuit tester and red/black meter pen, it is characterised in that: also
Including signal enlarging instrument, described circuit to be detected is provided with two probe interfaces for inserting red test pencil and black meter pen, described
Two probe interfaces connect two detection resistance being in parallel respectively；Described signal enlarging instrument one end be provided with for red test pencil and
Red test pencil interface that black meter pen connects and black meter pen interface, the other end is provided with the red test pencil contact pin for being connected and black with circuit tester
Test pencil contact pin.
2. DC current on-line detecting system as claimed in claim 1, it is characterised in that: described signal enlarging instrument includes electricity
Source, on and off switch, virtual earth bleeder circuit and discharge circuit, described positive source is connected with on and off switch the first end, on and off switch
Second end is connected with power cathode and virtual earth bleeder circuit respectively, and virtual earth bleeder circuit is connected with the input of discharge circuit, fortune
The outfan on electric discharge road connects red test pencil contact pin and black meter pen contact pin, the inverting input of discharge circuit connect red test pencil interface and
Black meter pen interface.
3. DC current on-line detecting system as claimed in claim 2, it is characterised in that: described on and off switch the first end also with
The positive pole of the 5th polar capacitor connects, and the negative pole of the 5th polar capacitor is connected with power cathode.
4. DC current on-line detecting system as claimed in claim 3, it is characterised in that: described virtual earth bleeder circuit includes the
One polar capacitor, the second polar capacitor, the first resistance and the second resistance, the positive pole of described first polar capacitor connects on and off switch
Two ends, the minus earth of the first polar capacitor；The plus earth of described second polar capacitor, the negative pole of the second polar capacitor connects electricity
Source negative pole；Described first resistance the first termination power switchs the second end, first resistance the second end ground connection；Described second resistance first
End ground connection, second resistance the second termination power negative pole, the first end of the first resistance and the second end of the second resistance and discharge circuit
Input connect.
5. DC current on-line detecting system as claimed in claim 4, it is characterised in that: described discharge circuit includes that computing is put
Big device, the earth terminal of described operational amplifier and the second end of the second resistance connect, the positive supply termination first of operational amplifier
First end of resistance, the zeroing end of operational amplifier connects zero-regulator resistor two ends, described zero-regulator resistor sliding end and operation amplifier
Device positive power source terminal connects；The normal phase input end of operational amplifier passes through the 6th capacity earth, the positive input of operational amplifier
By the 3rd resistance eutral grounding, the reverse input end of operational amplifier connects the first end of the 4th resistance, described 4th resistance second
End connects red test pencil interface, and the reverse input end of operational amplifier connects the first end of the 7th electric capacity, described 7th electric capacity second
End connects black meter pen interface, described 7th electric capacity the second end ground connection；The reverse input end of operational amplifier connects the of potentiometer
One end, the second end of described potentiometer and sliding end are connected with the outfan of operational amplifier after connecting；Potentiometer two ends are in parallel
4th electric capacity；The outfan of operational amplifier connects red test pencil contact pin, and the outfan of operational amplifier and the 3rd polar capacitor are just
Pole connects, and described 3rd polar capacitor negative pole connects black meter pen contact pin, the minus earth of the 3rd polar capacitor.
6. DC current on-line detecting system as claimed in claim 5, it is characterised in that: also include power indicating circuit, institute
Stating power indicating circuit and include light emitting diode and the 5th resistance, the positive pole of light emitting diode connects power supply by the 5th resistance and opens
Closing the second end, light emitting diode negative pole is connected with power cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620800491.2U CN205844395U (en) | 2016-07-28 | 2016-07-28 | A kind of DC current on-line detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620800491.2U CN205844395U (en) | 2016-07-28 | 2016-07-28 | A kind of DC current on-line detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205844395U true CN205844395U (en) | 2016-12-28 |
Family
ID=57641590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620800491.2U Expired - Fee Related CN205844395U (en) | 2016-07-28 | 2016-07-28 | A kind of DC current on-line detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205844395U (en) |
-
2016
- 2016-07-28 CN CN201620800491.2U patent/CN205844395U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20210728 |