CN209280792U - A kind of novel alternating current gauge outfit - Google Patents
A kind of novel alternating current gauge outfit Download PDFInfo
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- CN209280792U CN209280792U CN201822013162.5U CN201822013162U CN209280792U CN 209280792 U CN209280792 U CN 209280792U CN 201822013162 U CN201822013162 U CN 201822013162U CN 209280792 U CN209280792 U CN 209280792U
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- current
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- gauge outfit
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- resistance
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Abstract
Novel alternating current gauge outfit provided by the utility model, belongs to ac current measurement technical field, mainly solves the problems, such as that the prior art ac current measurement linearity is poor.Including rectification unit and range extension unit, it is characterized in that: the rectification unit includes rotary pointer gauge outfit, No.1 divider resistance, No. two divider resistances, No.1 rectifier diode, No. two rectifier diodes and current-limiting resistance, after the rotary pointer gauge outfit is connected with the current-limiting resistance, one end connects node, another termination lower node, the No.1 divider resistance one terminates left sibling, the other end connects node, No. two divider resistances one terminate left sibling, another termination lower node, the No.1 rectifier diode anode connects right node, cathode connects node, No. two rectifier diode anodes connect lower node, cathode connects right node；The range extension unit includes current transformer and slider, and current transformer primary coil is provided with multiple taps.
Description
Technical field
The utility model belongs to ac current measurement technical field, and in particular to a kind of novel alternating current gauge outfit.
Background technique
Ac current measurement is generally divided into first to rectify to shunt or first shunt afterwards at present rectifies two kinds afterwards.In order to mitigate rectifier
The burden of part, substantially all at present using by the way of first shunting and rectifying afterwards, the usually circuit is known as shunt resistance range extension
Circuit.Its advantage is that: circuit is simple, cost is relatively low.But this circuit have the shortcomings that one it is maximum: when measuring electric current, by
Too big in consumption electric energy itself, the difference in low-voltage circuit is too big, and the linearity of scale is poor.Electricity is shunted in order to overcome
This disadvantage on road realizes the linearity of scale and reduces power loss in measurement, in certain multimeters and alternating current ammeter
Head uses current transformer range extension circuit.
Summary of the invention
The purpose of the utility model is to provide it is a kind of can test cross galvanic electricity a cycle virtual value, and greatly improve friendship
The novel alternating current gauge outfit of the galvanic electricity flow measurement linearity.
The utility model adopts the technical scheme that solve above-mentioned technical problem:
Novel alternating current gauge outfit, including rectification unit and range extension unit, it is characterized in that: the rectification unit includes
Rotary pointer gauge outfit, No.1 divider resistance, No. two divider resistances, No.1 rectifier diode, No. two rectifier diodes and current limliting
Resistance, after the rotary pointer gauge outfit is connected with the current-limiting resistance, one end connects node, and another termination lower node is described
No.1 divider resistance one terminates left sibling, and the other end connects node, and No. two divider resistances one terminate left sibling, another termination
Lower node, the No.1 rectifier diode anode connect right node, and cathode connects node, and No. two rectifier diode anodes connect down
Node, cathode connect right node；
The range extension unit includes current transformer and slider, the secondary transformer coil it is of the same name
End is coupled with the left sibling, the different name end of the secondary transformer coil and the right node connection；The electric current is mutual
Sensor primary coil includes primary No.1 tap, primary No. two taps, primary No. three taps, in use, the sliding
Contact respectively with the primary No.1 tap, primary No. two taps and primary No. three tapped connections.
The utility model compared with prior art, has the advantages that
Structure of the utility model due to using bridge rectifier and current transformer primary tap, the measuring circuit
With the virtual value of test cross galvanic electricity a cycle, and the ac current measurement linearity is greatly improved, and cost is relatively low.
Detailed description of the invention
Fig. 1 is the principles of the present invention circuit diagram；
Fig. 2 is the positive half cycle equivalent circuit diagram of circuit shown in Fig. 1；
Fig. 3 is the negative half period equivalent circuit diagram of circuit shown in Fig. 1.
In figure: R1- No.1 divider resistance；R2- No. bis- divider resistances；Rs-current-limiting resistance；VD1-No.1 rectifies two poles
Pipe；No. bis- rectifier diodes of VD2-, CT-current transformer；A-current transformer primary Same Name of Ends terminals；B-sliding connects
Touch device terminals；A-left sibling；B-goes up node；The right node of c-；D-lower node；1-rotary pointer gauge outfit；2-electricity
Current transformer secondary coil；3-current transformer primary coils；4-primary No.1 taps；5-primary No. two taps；6-just
No. three taps of grade；7-sliders.
Specific embodiment
As shown in Figure 1, novel alternating current gauge outfit, including rectification unit and range extension unit, the rectification unit packet
Include rotary pointer gauge outfit 1, No.1 divider resistance R1, No. two divider resistance R2, No.1 rectifier diode VD1, No. two rectifications two
Pole pipe VD2 and current-limiting resistance Rs, after the rotary pointer gauge outfit 1 is connected with the current-limiting resistance Rs, one end connects node b,
Another termination lower node d, the No.1 divider resistance R1 mono- terminate left sibling a, and the other end connects node b, No. two partial pressures
Resistance one terminates left sibling a, another termination lower node d, and the No.1 rectifier diode VD1 anode meets right node c, and cathode connects
Node b, No. two rectifier diodes VD2 anode meet lower node d, and cathode meets right node c；
The range extension unit includes Current Transmit and slider 7, the secondary transformer coil 2
Same Name of Ends is coupled with the left sibling a, and the different name end of the secondary transformer coil 2 is coupled with the right node c；It is described
Current transformer primary coil 3 includes primary No.1 tap 4, primary No. two taps 5, primary No. three taps 6, in use process
In, the slider 7 is contacted with the primary No.1 tap 4, primary No. two taps 5 and primary No. three taps 6 respectively.
Working principle:
It is set as when input current is flowed to sliding contact device terminals B from current transformer primary Same Name of Ends terminals A
Positive half cycle, the equivalent circuit diagram of positive half cycle is as shown in Fig. 2, when from sliding contact device terminals B to flow to electric current mutual for input current
It is set as negative half period when sensor primary Same Name of Ends terminals A, the equivalent circuit diagram of negative half period is as shown in Figure 3.
Current transformer primary Same Name of Ends terminals A and sliding contact device terminals B are connect in alternating current circuit, are tested
AC current I flows into current transformer primary coil.Then according to gauge outfit measured value can operation obtain measured value I.
No.1 divider resistance R can be calculated below according to Fig. 2 circuit diagram1With No. two divider resistance R2Resistance value.
Such as in rotary pointer gauge outfit 1, range Ig=100mA internal resistance is Rg=10 Ω, the turn ratio of current transformer
It is 10.As input current I=5A, when, the electric current of gauge outfit is full deflection current IgWherein current-limiting resistance RSResistance value is 20 Ω.
Analysis: according to above-mentioned condition, when the secondary electric current of current transformer is
Input current I shown in Fig. 2EnterDirection be A be positive half cycle when flowing to B, have
Ig(R2+RS+Rg)=(I/-Ig)R1 ②
Input current I shown in Fig. 3EnterDirection be B be negative half period when flowing to A, have
Ig(R1+RS+Rg)=(I/-Ig)R2 ③
1. 2. 3. Simultaneous Equations obtain
The angle of throw of pointer and measured electric current are linear
Gauge outfit when measurement is that the angle of throw of pointer is directly proportional with by the current strength of gauge outfit.
The electric current of gauge outfit in the designResistance when ammeter has been formed, in table
Value R1、R2、RS、RgFor definite value, then the electric current of gauge outfit is directly proportional to input current.Pointer is obtained further according to the working principle of gauge outfit
Deflection angle θ is directly proportional to input current I, i.e. the scale of electric current is uniform.
Influence the factor of error
(1) function of the VA characteristic curve of diode can be approximately ic=0 (UBE<UBZ)
ic=gc (UBE-UBZ)(UBE>UBZ)
Because using current transformer, the electric current of gauge outfit in designWith diode
Current Voltage it is not related.
(2) work as R1≠R2When
The direction of input current I is that A is positive half cycle when flowing to B, is hadObtain gauge outfit
Current valueIt is I that positive measured value can be read according to the current value of gauge outfitJust=kI1
(the wherein ratio that K is the maximum range of ammeter and the full deflection current of gauge outfit).
Error are as follows:
The direction of input current I is that B is negative half period when flowing to A, is hadIt must measure
Current valueIt is I that positive measured value can be read according to the current value of gauge outfitInstead=kI2
Then error are as follows:
If working as R in above-mentioned example1=9.9 Ω, R2When=10.3 Ω: current direction be positive half cycle error be-
0.06A, current direction are that the error of negative half period is 0.14A.
(3) current transformer
Current transformer is that high current is become low current using the no-load voltage ratio relationship of mutual inductor, and the variation of power frequency is to mutual
The secondary current of sensor has an impact, but influences very little.
Reduce the method for error
Resistance R1、R2It is unequal to be the main reason for causing electric current Watch Error, therefore reduce, R2Difference can reduce
Error.
Note: Wen Zhong
UBEDiode forward enters voltage of the end (pole P) with respect to B point
UBZVoltage of the diode forward outlet (pole N) with respect to B point
IInsteadWhen the direction of input current is B to A, the current indication of electric current gauge outfit
I/Secondary transformer electric current, the turn ratio of n current transformer
IgRotary pointer electric current meter range, RgRotary pointer electric current ammeter resistance
I input current, the rotary pointer electric current meter pointer deflection angle of θ
I1When the direction of input current is A to B, the electric current of electric current gauge outfit is flowed through
IJustWhen the direction of input current is A to B, the current indication of electric current gauge outfit
The ratio of the full deflection current of the maximum range and gauge outfit of K ammeter
I2When the direction of input current is B to A, the electric current of electric current gauge outfit is flowed through
IIt is negativeWhen the direction of input current is A to B, the current indication of electric current gauge outfit.
Claims (1)
1. novel alternating current gauge outfit, including rectification unit and range extension unit, it is characterized in that: the rectification unit includes rotation
Rotatable pointer gauge outfit (1), No.1 divider resistance R1, No. two divider resistance R2, No.1 rectifier diode VD1, No. two rectifier diodes
VD2And current-limiting resistance Rs, after the rotary pointer gauge outfit (1) is connected with the current-limiting resistance Rs, one end connects node b, separately
One termination lower node d, the No.1 divider resistance R1One termination left sibling a, the other end connect node b, No. two partial pressures electricity
Resistance one termination left sibling a, another termination lower node d, the No.1 rectifier diode VD1Anode meets right node c, and cathode connects section
Point b, No. two rectifier diode VD2Anode meets lower node d, and cathode meets right node c；
The range extension unit includes Current Transmit and slider (7), the secondary transformer coil (2)
Same Name of Ends is coupled with the left sibling a, and the different name end of the secondary transformer coil (2) is coupled with the right node c；Institute
It states current transformer primary coil (3) and includes primary No.1 tap (4), primary No. two taps (5), primary No. three taps (6),
In use process, the slider (7) respectively with the primary No.1 tap (4), primary No. two taps (5) and No. three primary
Tap (6) contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822013162.5U CN209280792U (en) | 2018-12-03 | 2018-12-03 | A kind of novel alternating current gauge outfit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822013162.5U CN209280792U (en) | 2018-12-03 | 2018-12-03 | A kind of novel alternating current gauge outfit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209280792U true CN209280792U (en) | 2019-08-20 |
Family
ID=67609436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822013162.5U Expired - Fee Related CN209280792U (en) | 2018-12-03 | 2018-12-03 | A kind of novel alternating current gauge outfit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209280792U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115469139A (en) * | 2022-10-31 | 2022-12-13 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Current measuring device and method |
-
2018
- 2018-12-03 CN CN201822013162.5U patent/CN209280792U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115469139A (en) * | 2022-10-31 | 2022-12-13 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Current measuring device and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190820 Termination date: 20201203 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |