CN203881845U - Distributed type power supply grid-connected inverter DC-side current sampling circuit - Google Patents
Distributed type power supply grid-connected inverter DC-side current sampling circuit Download PDFInfo
- Publication number
- CN203881845U CN203881845U CN201420312589.4U CN201420312589U CN203881845U CN 203881845 U CN203881845 U CN 203881845U CN 201420312589 U CN201420312589 U CN 201420312589U CN 203881845 U CN203881845 U CN 203881845U
- Authority
- CN
- China
- Prior art keywords
- circuit
- operational amplifier
- output terminal
- resistance
- current sensor
- Prior art date
- 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.)
- Expired - Fee Related
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 14
- 238000001914 filtration Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The utility model discloses a distributed type power supply grid-connected inverter DC-side current sampling circuit. The distributed type power supply grid-connected inverter DC-side current sampling circuit comprises a current sensor, a filter circuit, a level adjusting circuit, an amplitude limit circuit and a voltage follower which are successively connected; and a signal acquired by the current sensor passes through the filter circuit, the level adjusting circuit, the amplitude limit circuit and the voltage follower in order and then is sent to an AD port of a DSP. The distributed type power supply grid-connected inverter DC-side current sampling circuit is advantageous in that fidelity of the DSP input detection signal is achieved, signal noises are eliminated to the limit, and signal input quality is improved.
Description
Technical field
The utility model relates to a kind of distributed electrical source grid-connected inverter DC side current sampling circuit.
Background technology
Existing distributed electrical source grid-connected inverter DC side electric current detects with current sensor LEM, after detection, directly current signal is converted to voltage signal, send into DSP through signal conditioning circuit, but, under this kind of mode, send into the signal that DSP carries out A/D conversion and have larger burr, may cause the distortion of dsp control signal, DSP control system is caused to certain interference and harm.
Utility model content
The utility model is exactly in order to solve prior art above shortcomings, and a kind of distributed electrical source grid-connected inverter DC side current sampling circuit is provided.This circuit is realized the fidelity of DC side current signal by signal is carried out to the links such as filtering, level adjustment, amplitude limit and voltage follow, eliminate to greatest extent burr.
To achieve these goals, the utility model adopts following technical scheme:
A kind of distributed electrical source grid-connected inverter DC side current sampling circuit, comprising: the current sensor, filtering circuit, level adjusting circuit, amplitude limiter circuit and the voltage follower that connect successively; The signal that current sensor collects is sent into the AD mouth of DSP successively after filtering after circuit, level adjusting circuit, amplitude limiter circuit and voltage follower;
The 1st pin of described current sensor H is unsettled, export after electrochemical capacitor C1 with reference to ground connection on the 2nd connect-15V of pin Yi road output power supply, another road, connect+15V power supply, another road output are exported with reference to ground connection after electrochemical capacitor C2 in the 4th the pin Yi road of current sensor H, and the 3rd pin of current sensor H is connected with filtering circuit;
Described filtering circuit comprises: resistance R 1, capacitor C 3 and the capacitor C 4 composition parallel circuit that is connected in parallel successively, and the 3rd pin of one end access current sensor H of parallel circuit, the other end is with reference to ground connection; Resistance R 2 is serially connected between capacitor C 3 and the shunt circuit of capacitor C 4.
Described level adjusting circuit comprises:
The electrode input end of operational amplifier U1 is connected with filtering circuit, negative input connects output terminal, and the output terminal of operational amplifier U1 accesses the negative input of operational amplifier U2 after resistance R 3;
The electrode input end of operational amplifier U2 after resistance R 5 with reference to ground connection, output terminal, another road connect after the resistance R 4+15V power supply of operational amplifier U2 accessed on negative input one tunnel after resistance R 6, the electrode input end of the output terminal access operational amplifier U3 of operational amplifier U2; The negative input of operational amplifier U3 accesses its output terminal, and the output terminal of operational amplifier U3 accesses amplitude limiter circuit after resistance R 7.
Amplitude limiter circuit comprises:
The electrode input end of operational amplifier U4 accesses its output terminal with reference to ground connection, negative input after resistance R 8 after resistance R 9, the output terminal access voltage follower U5 of operational amplifier U4.
The negative input of described voltage follower U5 is connected with its output terminal, the AD mouth of the output terminal access DSP of voltage follower U5.
The beneficial effects of the utility model are as follows:
The utility model has effectively been realized the fidelity of DSP input detection signal, and eliminate signal burr to greatest extent, has improved signal input quality.
Brief description of the drawings
Fig. 1 is the utility model DC side current sampling circuit figure;
Wherein, 1. filtering circuit, 2. level adjusting circuit, 3. amplitude limiter circuit, 4. voltage follower, 5. current sensor.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
A kind of distributed electrical source grid-connected inverter DC side current sampling circuit, comprising: the current sensor 5, filtering circuit 1, level adjusting circuit 2, amplitude limiter circuit 3 and the voltage follower 4 that connect successively; The signal that current sensor collects is sent into the AD mouth of DSP successively after filtering after circuit 1, level adjusting circuit 2, amplitude limiter circuit 3 and voltage follower 4;
The 1st pin of current sensor 5 is unsettled, export after electrochemical capacitor C1 with reference to ground connection on the 2nd connect-15V of pin Yi road output power supply, another road, connect+15V power supply, another road output are exported with reference to ground connection after electrochemical capacitor C2 in the 4th pin Yi road of current sensor 5, and the 3rd pin of current sensor 5 is connected with filtering circuit;
Filtering circuit 1 comprises: resistance R 1, capacitor C 3 and the capacitor C 4 composition parallel circuit that is connected in parallel successively, and the 3rd pin of one end access current sensor H of parallel circuit, the other end is with reference to ground connection; Resistance R 2 is serially connected between capacitor C 3 and the shunt circuit of capacitor C 4.
Level adjusting circuit 2 comprises:
The electrode input end of operational amplifier U1 is connected with filtering circuit, negative input connects output terminal, and the output terminal of operational amplifier U1 accesses the negative input of operational amplifier U2 after resistance R 3;
The electrode input end of operational amplifier U2 after resistance R 5 with reference to ground connection, output terminal, another road connect after the resistance R 4+15V power supply of operational amplifier U2 accessed on negative input one tunnel after resistance R 6, the electrode input end of the output terminal access operational amplifier U3 of operational amplifier U2; The negative input of operational amplifier U3 accesses its output terminal, and the output terminal of operational amplifier U3 accesses amplitude limiter circuit after resistance R 7.
Amplitude limiter circuit 3 comprises:
The electrode input end of operational amplifier U4 accesses its output terminal with reference to ground connection, negative input after resistance R 8 after resistance R 9, the output terminal access voltage follower U5 of operational amplifier U4.
The negative input of voltage follower U5 (4) is connected with its output terminal, the AD mouth of the output terminal access DSP of voltage follower U5 (4).
Principle of work of the present utility model: hall device LEM is by detecting DC side electric current, and what hall device adopted is the current sensor 5 of LT108-S7 based on hall principle, its primary current measurement range is-150A～+ 150A, conversion ratio 2000:1.Because this signal may appear at below 0V, need to be through superpotential lifting circuit, then pass through voltage follower 4, finally current signal is delivered in DSP.Therefore, current sensor 5 will detect the signal of returning successively after filtering 1, after level adjusting circuit 2, amplitude limiter circuit 3, voltage follower 4, send into the AD mouth of DSP.
In DSP processing procedure, a switch periods is carried out repeatedly A/D and is sampled and change, and then asks its mean value, can reach the effect of digital filtering.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection domain of the present utility model.
Claims (4)
1. a distributed electrical source grid-connected inverter DC side current sampling circuit, is characterized in that, comprising: the current sensor, filtering circuit, level adjusting circuit, amplitude limiter circuit and the voltage follower that connect successively; The signal that current sensor collects is sent into the AD mouth of DSP successively after filtering after circuit, level adjusting circuit, amplitude limiter circuit and voltage follower;
The 1st pin of described current sensor H is unsettled, export after electrochemical capacitor C1 with reference to ground connection on the 2nd connect-15V of pin Yi road output power supply, another road, connect+15V power supply, another road output are exported with reference to ground connection after electrochemical capacitor C2 in the 4th the pin Yi road of current sensor H, and the 3rd pin of current sensor H is connected with filtering circuit;
Described filtering circuit comprises: resistance R 1, capacitor C 3 and the capacitor C 4 composition parallel circuit that is connected in parallel successively, and the 3rd pin of one end access current sensor H of parallel circuit, the other end is with reference to ground connection; Resistance R 2 is serially connected between capacitor C 3 and the shunt circuit of capacitor C 4.
2. a kind of distributed electrical source grid-connected inverter DC side current sampling circuit as claimed in claim 1, is characterized in that, described level adjusting circuit comprises:
The electrode input end of operational amplifier U1 is connected with filtering circuit, negative input connects output terminal, and the output terminal of operational amplifier U1 accesses the negative input of operational amplifier U2 after resistance R 3;
The electrode input end of operational amplifier U2 after resistance R 5 with reference to ground connection, output terminal, another road connect after the resistance R 4+15V power supply of operational amplifier U2 accessed on negative input one tunnel after resistance R 6, the electrode input end of the output terminal access operational amplifier U3 of operational amplifier U2; The negative input of operational amplifier U3 accesses its output terminal, and the output terminal of operational amplifier U3 accesses amplitude limiter circuit after resistance R 7.
3. a kind of distributed electrical source grid-connected inverter DC side current sampling circuit as claimed in claim 1, is characterized in that, described amplitude limiter circuit comprises:
The electrode input end of operational amplifier U4 accesses its output terminal with reference to ground connection, negative input after resistance R 8 after resistance R 9, the output terminal access voltage follower U5 of operational amplifier U4.
4. a kind of distributed electrical source grid-connected inverter DC side current sampling circuit as claimed in claim 1, is characterized in that, the negative input of described voltage follower U5 is connected with its output terminal, the AD mouth of the output terminal access DSP of voltage follower U5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312589.4U CN203881845U (en) | 2014-06-12 | 2014-06-12 | Distributed type power supply grid-connected inverter DC-side current sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312589.4U CN203881845U (en) | 2014-06-12 | 2014-06-12 | Distributed type power supply grid-connected inverter DC-side current sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203881845U true CN203881845U (en) | 2014-10-15 |
Family
ID=51682330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420312589.4U Expired - Fee Related CN203881845U (en) | 2014-06-12 | 2014-06-12 | Distributed type power supply grid-connected inverter DC-side current sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203881845U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037767A (en) * | 2017-05-09 | 2017-08-11 | 昆明理工大学 | A kind of elevator door safety real-time control apparatus based on embedded Bluetooth ranging |
-
2014
- 2014-06-12 CN CN201420312589.4U patent/CN203881845U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037767A (en) * | 2017-05-09 | 2017-08-11 | 昆明理工大学 | A kind of elevator door safety real-time control apparatus based on embedded Bluetooth ranging |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203849325U (en) | Alternating-current and direct-current voltage isolation differential sampling circuit | |
| CN104330583A (en) | Aircraft engine rotating speed signal acquisition circuit | |
| CN201773140U (en) | Alternating current and direct current hybrid electric field intensity measuring device | |
| CN203881845U (en) | Distributed type power supply grid-connected inverter DC-side current sampling circuit | |
| CN201974489U (en) | Lightning arrester detector | |
| CN102749506A (en) | Direct current digital signal sampling circuit | |
| CN204464976U (en) | A kind of DC bus protective device | |
| CN209014646U (en) | The current detection circuit and electric machine controller of direct measuring type Hall sensor | |
| CN202975122U (en) | Buffering and isolation function-equipped current signal collection circuit for electric fire monitor | |
| CN202798501U (en) | Voltage transducer circuit of online monitoring device of switch cabinet | |
| CN204595016U (en) | A kind of long-range wind speed and direction measuring device | |
| CN203179278U (en) | Sensor signal acquisition module based on optical fiber communication technology | |
| CN207096325U (en) | A kind of A/D convertor circuit of intelligent electric meter | |
| CN202886479U (en) | Insulation resistance-to-ground sampling signal processing circuit for photovoltaic grid-connection system | |
| CN202794285U (en) | Isolation processing circuit for small analog alternating current (AC) or direct current (DC) signals | |
| CN208588770U (en) | A kind of signal sample circuit and signal sampling device | |
| CN202533493U (en) | Current sampling circuit applied to intelligent wireless monitor of distribution line | |
| CN106405308A (en) | Switch cabinet wire connection terminal electric leakage detection system | |
| CN103227451A (en) | Undervoltage and overvoltage detection and protection method of network voltage, and detection and protection device of method | |
| CN204595661U (en) | A kind of high voltage source device able to programme | |
| CN204215019U (en) | A kind of current of electric detection module | |
| CN204832311U (en) | Photoelectricity current sensor | |
| CN204116433U (en) | A kind of phase current sensing circuit of high-frequency dust removing power supply | |
| CN206331010U (en) | A kind of voltage sampling circuit of three-phase self-adapting intelligent ammeter | |
| CN204856129U (en) | Multichannel industry data acquisition module suitable for earth -leakage protector |
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: 20141015 Termination date: 20190612 |