CN207571188U - A kind of direct current measuring devices - Google Patents
A kind of direct current measuring devices Download PDFInfo
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- CN207571188U CN207571188U CN201721776956.6U CN201721776956U CN207571188U CN 207571188 U CN207571188 U CN 207571188U CN 201721776956 U CN201721776956 U CN 201721776956U CN 207571188 U CN207571188 U CN 207571188U
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Abstract
The utility model discloses a kind of direct current measuring devices, belong to the field of current measurement in electrotechnics, including sensing head, power transformer, inductance coil, diode, measuring resistance, driver transformer, bandpass filter, demodulator and power amplifier, the sensing head includes the identical first annular detection iron core of shape and the second annular detection iron core, it is wound with the first identical detection winding of the number of turn respectively on first annular detection iron core and the second annular detection iron core, second detection winding, the outside of first detection winding and the second detection winding cladding electrostatic screen layer is placed in the cavity of the shielding iron core with toroidal cavity structure, it is wound with compensative winding and secondary winding successively outside shielding iron core.The utility model has that high certainty of measurement, the linearity are good, overall performance price than it is high the advantages of, with superior properity, can be widely used for the on-line checking of the industries DC current such as electric smelting, electrochemistry, plating, electric power, electric vehicle.
Description
Technical field
The utility model belongs to the field of current measurement in electrotechnics, more particularly, to a kind of DC current measurement
Device.
Background technology
Patent No. ZL02139203.X entitled " D. C. current sensing device ",《Central China University of Science and Technology's journal》2003 the 31st
It rolls up " the compensation direct current sensing theory research of magnetic potential self-balance and feedback " disclosed in o. 11th, the device is bent using iron core rectangular magnetization
The characteristic of line, it is established that then direct current magnetic potential balance detects composition difference by ampere-turn difference and flows back to feedback compensation system, will be based on open loop
The magnetic potential balance of principle is combined with the stable regulation system based on compensation principle, realizes a kind of new side of DC current measurement
Method.But there are following defects：Its difference current detecting system is the variation based on magnetic amplifier principle exciting current, detects it
Difference current, detection sensitivity is than relatively low, thus the device can be only achieved in the range of 40%~100% rated current and should have
Relative error, i.e., error is with regard to bigger below 40%, poor linearity, root be exactly difference current detection method exist lack
It falls into.
It can be seen that existing direct-current measuring device there is technical issues that measurement accuracy it is low,.
Utility model content
For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of DC current measurement dress
Put, thus solve existing direct-current measuring device there is technical issues that measurement accuracy it is low,.
To achieve the above object, the utility model provides a kind of direct current measuring devices, becomes including sensing head, power supply
Depressor, inductance coil, diode, measuring resistance, driver transformer, bandpass filter, demodulator and power amplifier,
The sensing head includes first annular detection iron core, the second annular detection iron core, the first detection winding, the second detection
Winding, electrostatic screen layer, shielding iron core, compensative winding and secondary winding, the first annular detection iron core and the second annular inspection
The shape for surveying iron core is identical, and the first identical inspection of the number of turn is wound with respectively on first annular detection iron core and the second annular detection iron core
The outside cladding electrostatic screen layer of survey winding, the second detection winding, the first detection winding and the second detection winding, which is placed on, to be had
In the cavity of the shielding iron core of toroidal cavity structure, it is wound with compensative winding and secondary winding successively outside shielding iron core；
The Same Name of Ends of the secondary winding is grounded after being sequentially connected inductance coil, measuring resistance, the different name end of secondary winding
It is connected with the cathode of diode, the anode of diode is connected with the Same Name of Ends of the vice-side winding of power transformer, power transformer
The different name end of vice-side winding be connected to earth point；The different name end of first detection winding is connected with the different name end of the second detection winding
After be grounded, the Same Name of Ends of the first detection winding is connected with the vice-side winding Same Name of Ends of driver transformer, the second detection winding it is same
The different name end of the vice-side winding of name end and driver transformer connects；The centre cap of the vice-side winding of driver transformer is connected to band
The input terminal of bandpass filter, the output terminal of bandpass filter are connected to the input terminal of demodulator, and the output terminal of demodulator is connected to
The input terminal of power amplifier, the output terminal of power amplifier are connected with the different name end of compensative winding, the Same Name of Ends of compensative winding
It is connected to the Same Name of Ends of secondary winding.
Further, the material of the electrostatic screen layer is copper foil, the first annular detection iron core, the second annular detection
The material of iron core and magnetic screen iron core is cold-reduced silicon sheet.
Further, secondary winding is identical with the number of turn of compensative winding, and secondary winding is multiturn with compensative winding.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Row advantageous effect：
The shielding iron core of the utility model has toroidal cavity structure, is wound with compensative winding and two successively outside shielding iron core
Secondary winding, the Same Name of Ends of compensative winding are connected to the Same Name of Ends of secondary winding so that the utility model has high certainty of measurement, line
Property degree is good, overall performance price than it is high the advantages of, with superior properity, can be widely used for electric smelting, electrochemistry, plating,
The on-line checking of the industries DC current such as electric power, electric vehicle.
Description of the drawings
The sensing head external form figure of Fig. 1 the utility model；
The sensing head sectional view of Fig. 2 the utility model；
A kind of circuit diagram of the direct current measuring devices of Fig. 3 the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below
The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.
Shown in Fig. 1, a kind of sensing head external form figure of direct current measuring devices, section is as shown in Figure 2：Shape is identical
First annular detection iron core C2With the second annular detection iron core C3It is upper to be wound with the first identical detection winding W of the number of turn respectivelyD1, second
Detection winding WD2, then they are integrally placed at empty with annular around upper electrostatic screen copper foil in their outside after assembly
The shielding iron core C of cavity configuration1Cavity in, in shielding iron core C1Outside further around upper compensative winding WCWith secondary winding W2.Shown in Fig. 3
First winding W1That is transmission measured DC I1Busbar, passed through from sensing head center hole as shown in Figure 1.
Fig. 3 gives a kind of circuit diagram of direct current measuring devices.Secondary winding W in sensing head T2Same Name of Ends successively
Connect inductance coil L, measuring resistance RSAfter be connected to the ground, different name end is connected with the cathode of diode D, the anode of diode D with
Power transformer T1The Same Name of Ends of vice-side winding be connected, the different name end of vice-side winding is connected to earth point；First detection winding
WD1Different name end and the second detection winding WD2Different name end be connected after be grounded, the first detection winding WD1Same Name of Ends with excitation become
Depressor T2Vice-side winding Same Name of Ends is connected, the second detection winding WD2Same Name of Ends and driver transformer T2The different name end of vice-side winding
Connection；Driver transformer T2The centre cap of vice-side winding is connected to the input terminal of bandpass filter A, and bandpass filter A's is defeated
Outlet is connected to the input terminal of demodulator B, and the output terminal of demodulator B is connected to the input terminal of power amplifier C, power amplifier
The output terminal of C and compensative winding WCDifferent name end be connected, compensative winding WCSame Name of Ends be connected to secondary winding W2Same Name of Ends.
After the present apparatus puts into operation, by power transformer T1Half-wave current, which is provided, through diode D flows through secondary winding W2,
By shielding iron core C in half period1With secondary winding W2, secondary balancing electric current I is established automatically2SWith tested primary current I1Between
Direct current magnetic potential balance, this magnetic potential balance is to determine that it, which is avoided, makes by the characteristic of the approximate rectangular magnetization curve of iron core
With high-power electronic device driving secondary balancing electric current I2SActive approach, and realize direct current magnetic potential balance.It is different from tradition
Structure is driven by high open-loop voltage gain (generally higher than 1000 times), PID governing loops and high-power driven source in closed-loop system
Into direct current magnetic potential balance, because the oscillation of system and high-power driving problem may be not present.Since this magnetic potential balance does not have generally
The accuracy for having closed-loop system magnetic potential balance is high, and the utility model is shielding reasonably by core design into center cavity structure
Iron core C1Setting detection iron core C in cavity2、C3With detection winding WD1、WD2, it is above-mentioned straight based on magnetic modulator principle to detect
The ampere-turn for flowing magnetic potential balance is poor.Through driver transformer T2After excitatory, iron core C is detected2、C3With detection winding WD1、WD2And excitation
Transformer T2The magnetic modulator of composition, by magnetic modulated detection signal from driver transformer T2Vice-side winding centre cap takes out, through band
Bandpass filter A, demodulator B, power amplifier C, output DC compensation electric current I2CFeed back to compensative winding WC, so as to fulfill above-mentioned
The ampere-turn difference compensation of direct current magnetic potential balance, maintains high-precision direct current magnetic potential balance.
The above-mentioned magnetic modulation technique based on magnetic modulator principle is replaced the straight of existing magnetic amplifier principle by the utility model
The detection technique of magnetic potential balance ampere-turn difference is flowed, detection sensitivity, resolution ratio improve 20 times or more so that single unit system measures essence
Degree, the linearity generate the variation of matter, realize a kind of superior overall performance of direct current measuring devices of the utility model.
Secondary balancing electric current I2SWith second compensation electric current I2CPass through measuring resistance RSSuperposition, obtains direct current measuring devices
Secondary current I2=I2S+I2C, so as to fulfill secondary ampere-turn W2I2With a direct current ampere-turn W1I1Magnetic potential almost balance
W2I2≈W1I1, the number of turn of usual measured DC busbar is 1 circle, i.e. W1=1, secondary winding W2With compensative winding WCThe number of turn
It is identical, i.e. W2=WCFor multiturn, so secondary low current I1=(W1/W2)I1It accurately represents to be tested a high current, ratio system
Number W1/W2To be a constant once with the turn ratio of secondary winding.Secondary current I2Flow through measuring resistance RS, in measuring resistance
Obtain voltage value I2RS, to meet the requirements the needs of the samplings such as the digital implementation of voltage signal output, computer.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principles of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (2)
1. a kind of direct current measuring devices, which is characterized in that including sensing head, power transformer, inductance coil, diode,
Measuring resistance, driver transformer, bandpass filter, demodulator and power amplifier,
The sensing head include it is first annular detection iron core, second annular detection iron core, the first detection winding, second detection around
Group, electrostatic screen layer, shielding iron core, compensative winding and secondary winding, the first annular detection iron core and the second annular detection
The shape of iron core is identical, and the first identical detection of the number of turn is wound with respectively on first annular detection iron core and the second annular detection iron core
The outside cladding electrostatic screen layer of winding, the second detection winding, the first detection winding and the second detection winding is placed on ring
In the cavity of the shielding iron core of shape cavity structure, it is wound with compensative winding and secondary winding successively outside shielding iron core；
The Same Name of Ends of the secondary winding is grounded after being sequentially connected inductance coil, measuring resistance, the different name end and two of secondary winding
The cathode of pole pipe is connected, and the anode of diode is connected with the Same Name of Ends of the vice-side winding of power transformer, the pair of power transformer
The different name end of side winding is connected to earth point；The different name end of first detection winding is connected with the different name end of the second detection winding to be followed by
Ground, the Same Name of Ends of the first detection winding are connected with the vice-side winding Same Name of Ends of driver transformer, the Same Name of Ends of the second detection winding
It is connect with the different name end of the vice-side winding of driver transformer；The centre cap of the vice-side winding of driver transformer is connected to band logical filter
The input terminal of wave device, the output terminal of bandpass filter are connected to the input terminal of demodulator, and the output terminal of demodulator is connected to power
The input terminal of amplifier, the output terminal of power amplifier are connected with the different name end of compensative winding, the Same Name of Ends connection of compensative winding
To the Same Name of Ends of secondary winding.
2. a kind of direct current measuring devices as described in claim 1, which is characterized in that the material of the electrostatic screen layer is
Copper foil, the material of the first annular detection iron core, the second annular detection iron core and magnetic screen iron core is cold-reduced silicon sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721776956.6U CN207571188U (en) | 2017-12-14 | 2017-12-14 | A kind of direct current measuring devices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721776956.6U CN207571188U (en) | 2017-12-14 | 2017-12-14 | A kind of direct current measuring devices |
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| CN207571188U true CN207571188U (en) | 2018-07-03 |
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| CN201721776956.6U Expired - Fee Related CN207571188U (en) | 2017-12-14 | 2017-12-14 | A kind of direct current measuring devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942123A (en) * | 2017-12-14 | 2018-04-20 | 华中科技大学 | A kind of direct current measuring devices |
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2017
- 2017-12-14 CN CN201721776956.6U patent/CN207571188U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942123A (en) * | 2017-12-14 | 2018-04-20 | 华中科技大学 | A kind of direct current measuring devices |
| CN107942123B (en) * | 2017-12-14 | 2024-02-02 | 华中科技大学 | Direct current measuring device |
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Granted publication date: 20180703 Termination date: 20211214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |