CN203574372U - Current sampling board for active filter - Google Patents
Current sampling board for active filter Download PDFInfo
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- CN203574372U CN203574372U CN201320734937.2U CN201320734937U CN203574372U CN 203574372 U CN203574372 U CN 203574372U CN 201320734937 U CN201320734937 U CN 201320734937U CN 203574372 U CN203574372 U CN 203574372U
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- terminal board
- terminals
- discharge circuit
- terminal
- current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a current sampling board for an active filter. The current sampling board comprises an operational amplifier circuit A (7.1), an operational amplifier circuit B (7.2), an operational amplifier circuit C (7.3) and a sampling board body (5), wherein the sampling board body (5) is provided with a terminal row B (6), the sampling board further comprises a Hall sensor A (4.1), a Hall sensor B (4.2) and a Hall sensor C (4.3), and the sampling board body (5) is further provided with a terminal row C (3). Through the current sampling board for the active filter, a precise instrument of the Hall sensors is 0.2-1%, so sampling is more accurate; the external Hall sensors are used to reduce steps of an inner operation conversion circuit. Distortion of signal transmission is reduced, so precision is higher than that of a current transformer; through the connected Hall sensors, the Hall sensors can be used together with the current transformer or can be used independently, so compatibility of the current sampling board is improved.
Description
Technical field
The utility model relates to a kind of current sample plate, for active filter.Belong to electronic component device technical field.
Background technology
The current waveform that active filter is produced by nonlinear load by Real-Time Monitoring, isolates harmonic wave part, and by equal and opposite in direction, the harmonic current injection of opposite direction, in electrical network, is realized the function of filtering harmonic wave.
Active filter has two each and every one sampled points to electrical network, is respectively the sampling of three-phase voltage and three-phase current.Due to electric current vary within wide limits concerning voltage, speed is fast, so current sample is partly the most key part, is directly connected to calculating and the control of harmonic current.
At present, in whole industry, generally adopt the current transformer of 0.2 class precision to carry out the sampling of electric current.But in actual use procedure, also exist the following deficiency.
1, can only make Current Transformer sample.
2, current transformer full accuracy is 2%, and measure error is large.
3, current transformer must partly be changed via the computing change-over circuit of sampling plate inside, and flow path switch is many, and distorted signals is large.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of current sample plate is provided, and this sampling plate is used Hall element to sample, and compatible good, sample mode is flexible, has reduced the distortion factor of signal transmission, and accuracy is high.
The purpose of this utility model is achieved in that
A kind of current sample plate for active filter, comprise discharge circuit A, discharge circuit B, discharge circuit C, resistance R A, resistance R B, resistance R C and sampling plate body, on sampling plate body, be provided with terminal board B, be characterized in: described sampling plate also comprises Hall element A, Hall element B and Hall element C, on described sampling plate body, be also provided with terminal board C, No. 1 terminal of terminal board C is connected with discharge circuit A "+", No. 1 terminal with terminal board B is connected again, No. 2 terminals of terminal board C are connected with discharge circuit A "-", No. 2 terminals with terminal board B are connected again, No. 3 terminals of terminal board C are connected with discharge circuit A " M ", No. 3 terminals with terminal board B are connected again, with resistance R A, be connected again, No. 4 terminals of terminal board C are connected with discharge circuit B "+", No. 1 terminal with terminal board B is connected again, No. 5 terminals of terminal board C are connected with discharge circuit B "-", No. 2 terminals with terminal board B are connected again, No. 6 terminals of terminal board C are connected with discharge circuit B " M ", No. 5 terminals with terminal board B are connected again, with resistance R B, be connected again, No. 7 terminals of terminal board C are connected with discharge circuit C "+", No. 1 terminal with terminal board B is connected again, No. 8 terminals of terminal board C are connected with discharge circuit C "-", No. 2 terminals with terminal board B are connected again, No. 9 terminals of terminal board C are connected with discharge circuit C " M ", No. 6 terminals with terminal board B are connected again, with resistance R C, be connected again.
Compared with prior art, the beneficial effects of the utility model are:
1, a kind of current sample plate for active filter of the utility model, can not make Current Transformer, and use Hall element is sampled or both are combined with, and compatible good, sample mode is flexible.
2, the precision instrument of Hall element is 0.2% ~ 1% left and right, so sampling is more correct.
3, due to as long as use external Hall element, reduced the link of internal arithmetic change-over circuit.The distortion factor of signal transmission is reduced, make higher than current transformer of accuracy.
This utility model has sample mode can be selected flexibly, and compatible good, sampling precision is high.Can effectively improve active filter and administer the effect of harmonic wave, also just indirectly improve the capacity of separate unit active filter, can produce huge economic benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of current sample plate for active filter of the utility model.
Fig. 2 is the structural representation of the existing current sample plate for active filter.
In figure:
Current transformer A1.1,
Current transformer B1.2,
Current transformer C1.3,
Terminal board A2,
Terminal board C3,
Hall element A4.1,
Hall element B4.2,
Hall element C4.3,
Terminal board B6,
Discharge circuit A7.1,
Discharge circuit B7.2,
Discharge circuit C7.3,
Embodiment
Referring to Fig. 1, the utility model relates to a kind of current sample plate for active filter, described sampling plate is connected with master control borad 8, described sampling plate comprises current transformer A1.1, current transformer B1.2, current transformer C1.3, Hall element A4.1, Hall element B4.2, Hall element C4.3, sampling plate body 5, discharge circuit A7.1, discharge circuit B7.2, discharge circuit C7.3 and master control borad 8, is provided with terminal board A2, terminal board C3 and terminal board B6 on described sampling plate body 5.
Wherein, No. 1 terminal of terminal board C3 connects "+" end of Hall element A4.1, No. 2 terminals of terminal board C3 connect "-" terminal of Hall element A4.1, No. 3 terminals of terminal board C3 connect " M " terminal of Hall element A4.1, No. 4 terminals of terminal board C3 connect "+" terminal of Hall element B4.2, No. 5 terminals of terminal board C3 connect "-" terminal of Hall element B4.2, No. 6 terminals of terminal board C3 connect " M " terminal of Hall element B4.2, No. 7 terminals of terminal board C3 connect "+" terminal of Hall element C4.3, No. 8 terminals of terminal board C3 connect "-" terminal of Hall element C4.3, No. 9 terminals of terminal board C3 connect " M " terminal of Hall element C4.3.
No. 1 terminal of terminal board A2 connects " S1 " terminal of current transformer A1.1, No. 2 terminals of terminal board A2 connect " S2 " terminal of current transformer A1.1, No. 3 terminals of terminal board A2 connect " S1 " terminal of current transformer B1.2, No. 4 terminals of terminal board A2 connect " S2 " terminal of current transformer B1.2, No. 5 terminals of terminal board A2 connect " S1 " terminal of current transformer C1.3, and No. 6 terminals of terminal board A2 connect " S2 " terminal of current transformer C1.3.
No. 1 terminal of terminal board A2 is connected with discharge circuit A7.1 " HT+ ", No. 2 terminals of terminal board A2 are connected with discharge circuit A7.1 " HT-", No. 3 terminals of terminal board A2 are connected with discharge circuit B7.2 " HT+ ", No. 4 terminals of terminal board A2 are connected with discharge circuit B7.2 " HT-", No. 5 terminals of terminal board A2 are connected with discharge circuit C7.3 " HT+ ", and No. 6 terminals of terminal board A2 are connected with discharge circuit C7.3 " HT-".
No. 1 terminal of terminal board C3 is connected with discharge circuit A7.1 "+", follow again No. 1 terminal connected (from the power supply of obtain+15V of master control borad 8) of terminal board B6, No. 2 terminals of terminal board C3 are connected with discharge circuit A7.1 "-", follow again No. 2 terminals connected (from the power supply of obtain-15V of master control borad 8) of terminal board B6, No. 3 terminals of terminal board C3 are connected with discharge circuit A7.1 " M ", No. 3 terminals with terminal board B6 are connected again, again with resistance R A connected (transmitting the current sampling signal Va of A phases to master control borad 8), No. 4 terminals of terminal board C3 are connected with discharge circuit B7.2 "+", follow again No. 1 terminal connected (from the power supply of obtain+15V of master control borad 8) of terminal board B6, No. 5 terminals of terminal board C3 are connected with discharge circuit B7.2 "-", No. 2 terminals with terminal board B6 are connected again, (from the power supply of obtain-15V of master control borad 8), No. 6 terminals of terminal board C3 are connected with discharge circuit B7.2 " M ", No. 5 terminals with terminal board B6 are connected again, again with resistance R B connected (transmitting the current sampling signal Vb of B phases to master control borad 8), No. 7 terminals of terminal board C3 are connected with discharge circuit C7.3 "+", follow again No. 1 terminal connected (from the power supply of obtain+15V of master control borad 8) of terminal board B6, No. 8 terminals of terminal board C3 are connected with discharge circuit C7.3 "-", follow again No. 2 terminals connected (from the power supply of obtain-15V of master control borad 8) of terminal board B6, No. 9 terminals of terminal board C3 are connected with discharge circuit C7.3 " M ", No. 6 terminals with terminal board B6 are connected again, again with resistance R C connected (transmitting the current sampling signal Vc of C phases to master control borad 8).
After the output of resistance R A, RB, RC is connected, then be connected with No. 4 terminals of terminal board B6, the public end signal GND of sampled signal be provided to master control borad 8.
Suppose that sample objects electric current is 1000A, if adopt current transformer mode, current transformer precision highest order 2%, 1000*0.02=20A, J is the error that sample rate current has 20A, (error that does not comprise internal arithmetic change-over circuit); If adopt external Hall element mode, Hall element precision is 0.2% ~ 1%, gets maximal accuracy 1%, 1000*0.01=10A, and error current is 10A.
By above analysis, can be found out, Hall element is the in the situation that of worst error, and its error current is 50% of current transformer minimum error, if get 0.2% Hall element, the accuracy of sampling will further improve.
Claims (1)
1. the current sample plate for active filter, comprise discharge circuit A(7.1), discharge circuit B(7.2), discharge circuit C(7.3), resistance R A, resistance R B, resistance R C and sampling plate body (5), sampling plate body is provided with terminal board B(6 on (5)), it is characterized in that: described sampling plate also comprises Hall element A(4.1), Hall element B(4.2) and Hall element C(4.3), on described sampling plate body (5), be also provided with terminal board C(3), terminal board C(3) No. 1 terminal is with discharge circuit A(7.1) "+" be connected, again with terminal board B(6) No. 1 terminal be connected, terminal board C(3) No. 2 terminals are with discharge circuit A(7.1) "-" be connected, again with terminal board B(6) No. 2 terminals be connected, terminal board C(3) No. 3 terminals are with discharge circuit A(7.1) " M " be connected, again with terminal board B(6) No. 3 terminals be connected, with resistance R A, be connected again, terminal board C(3) No. 4 terminals are with discharge circuit B(7.2) "+" be connected, again with terminal board B(6) No. 1 terminal be connected, terminal board C(3) No. 5 terminals are with discharge circuit B(7.2) "-" be connected, again with terminal board B(6) No. 2 terminals be connected, terminal board C(3) No. 6 terminals are with discharge circuit B(7.2) " M " be connected, again with terminal board B(6) No. 5 terminals be connected, with resistance R B, be connected again, terminal board C(3) No. 7 terminals are with discharge circuit C(7.3) "+" be connected, again with terminal board B(6) No. 1 terminal be connected, terminal board C(3) No. 8 terminals are with discharge circuit C(7.3) "-" be connected, again with terminal board B(6) No. 2 terminals be connected, terminal board C(3) No. 9 terminals are with discharge circuit C(7.3) " M " be connected, again with terminal board B(6) No. 6 terminals be connected, with resistance R C, be connected again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320734937.2U CN203574372U (en) | 2013-11-20 | 2013-11-20 | Current sampling board for active filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320734937.2U CN203574372U (en) | 2013-11-20 | 2013-11-20 | Current sampling board for active filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203574372U true CN203574372U (en) | 2014-04-30 |
Family
ID=50542084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320734937.2U Expired - Fee Related CN203574372U (en) | 2013-11-20 | 2013-11-20 | Current sampling board for active filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203574372U (en) |
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2013
- 2013-11-20 CN CN201320734937.2U patent/CN203574372U/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 |
Granted publication date: 20140430 Termination date: 20141120 |
|
| EXPY | Termination of patent right or utility model |