CN214427507U - Circuit for isolating DSP (digital signal processor) from bus - Google Patents
Circuit for isolating DSP (digital signal processor) from bus Download PDFInfo
- Publication number
- CN214427507U CN214427507U CN202120167096.6U CN202120167096U CN214427507U CN 214427507 U CN214427507 U CN 214427507U CN 202120167096 U CN202120167096 U CN 202120167096U CN 214427507 U CN214427507 U CN 214427507U
- Authority
- CN
- China
- Prior art keywords
- dsp
- bus
- resistor
- sampling module
- signal
- 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.)
- Active
Links
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 239000013307 optical fiber Substances 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 13
- 238000005065 mining Methods 0.000 abstract description 13
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000002955 isolation Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 abstract description 3
- 230000008054 signal transmission Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a circuit that DSP and generating line were kept apart, the generating line is connected with the DSP control panel through busbar voltage sampling module, optic fibre break plate, the optic fibre break plate carries out signal acquisition with busbar voltage sampling module's signal transmission to the DSP control panel through optic fibre, the chip is put including the divider resistance, photoelectric coupler and the fortune that connect gradually to busbar voltage sampling module. The utility model discloses an optic fibre is as the inside transmission medium of mining converter, and the problem is kept apart to solution strong and weak electricity that can be fine, and the transmission that can not disturb the light signal is turned on and turn-off to the inside electrical equipment of converter, and the light signal can not produce other electrical equipment of radiation interference yet simultaneously, can strengthen greatly to the effect of signal isolation when adopting optic fibre transmission signal, also can not have the problem altogether, stable in structure, and the interference killing feature is strong.
Description
Technical Field
The utility model relates to a signal acquisition circuit structure in the mining converter especially relates to a circuit that DSP and generating line were kept apart.
Background
For a mining frequency converter, in order to improve the reliability and stability of the mining frequency converter, various signals are usually detected, and bus voltage detection is one of the signals. Because the input voltage for mining is higher, the internal bus voltage ratio is higher, and the DSP control panel supplies power for the weak point, the bus voltage acquisition circuit with the isolation function is very important for the mining frequency converter.
On the other hand, because the switching frequency of the electrical equipment in the frequency converter is higher, the electromagnetic interference generated in the mining frequency converter is larger, so that errors exist in the collection of the bus voltage signals by the DSP, the overvoltage protection function in the frequency converter fails, and the hidden trouble that the frequency converter is damaged exists. Therefore, how to sample the bus voltage and control the on-off of the electrical equipment through the isolation of the DSP and the bus is very important to control the output of the frequency converter.
SUMMERY OF THE UTILITY MODEL
The utility model provides a circuit that DSP and generating line were kept apart disturbs big problem when solving mining frequency conversion busbar voltage sampling and power device switch break-make, has solved the problem that busbar voltage influences the DSP control panel, and its technical scheme is as follows:
the circuit for isolating the DSP from the bus has the following beneficial effects:
(1) through the utility model discloses, the busbar voltage collection precision of using the mining converter of generating line isolating circuit is high, has good linearity, and the busbar voltage detection function of mining converter is normal.
(2) Adopt optic fibre as the inside transmission medium of mining converter, solution strong and weak electricity that can be fine keeps apart the problem, and the transmission of light signal can not be disturbed in switching on and switching off of the inside electrical equipment of converter, and light signal can not produce radiation interference other electrical equipment yet simultaneously, can strengthen greatly to the effect of signal isolation when adopting optic fibre transmission signal, also can not have the problem altogether, stable in structure, and the interference killing feature is strong.
(3) When the voltage divider is applied specifically, the number and the resistance of the divider resistors can be changed according to the bus voltage, and the voltage divider has good practicability as long as the low-voltage signal after voltage division is not more than the voltage range allowed by the DSP.
Drawings
FIG. 1 is a schematic diagram of a bus voltage sampling module;
FIG. 2 is a schematic circuit diagram of the isolation of the DSP control board from the bus;
Detailed Description
The utility model provides a circuit that DSP and generating line were kept apart for the isolation of the direct current generating line in mining frequency conversion field and DSP control panel, it includes busbar voltage sampling module 1 and optic fibre break board 2, the generating line is connected with optic fibre break board 2 through busbar voltage sampling module 1, optic fibre break board 2 is connected with DSP control panel 3. The bus voltage sampling module 1 can also be integrated on a fiber distribution board. The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the bus voltage sampling module 1 includes a voltage dividing resistor 4, a photocoupler 5 and an operational amplifier chip 6, which are connected in sequence.
The voltage dividing resistor 4 comprises a first resistor 11, a second resistor 12 and a third resistor 13 which are connected in series, the voltage dividing resistor 4 is connected between the buses P, N, voltage division is carried out on the direct current bus voltage through the three high-precision resistors, and the voltage dividing resistor 4 is connected with the buses through high-voltage-resistant wires, so that the insulation requirement of the system is guaranteed. The bus P, N represents the positive DC + and negative DC-of the bus, respectively.
The divided voltage of the third resistor 13 is isolated by the linear photoelectric coupler 5, and after the sampling multiple processing is completed by the operational amplifier chip 6 at the later stage, the detection voltage signal is sent to the optical fiber distribution board 2 through the connector 7 and then sent to the A/D sampling interface of the DSP control board 3 through the optical fiber distribution board 2.
The first resistor 11 is a wafer resistor with the resistance of 2M omega +/-0.5% and 3W; the second resistor 12 is a wafer resistor of 2M omega +/-0.5% and 3W; the third resistor 13 is a 1W wafer resistor with 3.6K omega +/-1%.
The model of the photoelectric coupler 5 is a precision optical isolation voltage sensor ACPL-C87B.
The model of the operational amplifier chip 6 is a two-way enhanced JFET precision operational amplifier TL 052.
Further, a voltage stabilizing diode 8 is externally connected between the photocoupler 5 and the third resistor 13 for preventing a series interference signal. The front end of the photoelectric coupler 5 is provided with a first capacitor 9, and the front end of the connector 7 is provided with a second capacitor 10 for realizing signal filtering.
The first capacitor 9 is a 100pF +/-5% patch capacitor.
And the second capacitor 10 is a 100pF +/-5% patch capacitor.
The utility model discloses when specifically using, can be according to busbar voltage's size, change the quantity and the resistance of three resistance in the divider resistance 4, as long as guarantee the low-voltage signal after the partial pressure not exceed the voltage range that DSP allows can, have fine practicality.
As shown in fig. 2, the bus voltage sampling module 1 is integrated on an optical fiber distribution board 2, an optical fiber is integrated on the optical fiber distribution board, a signal of the bus voltage sampling module 1 is sent to a DSP control board 3 through the optical fiber for signal acquisition, and a power supply 14 of the DSP control board 3 supplies power to a weak current of the frequency converter.
The utility model discloses an optic fibre is as the inside transmission medium of mining converter, and the problem is kept apart to solution strong and weak electricity that can be fine, and the transmission that can not disturb the light signal is turned on and turn-off to the inside electrical equipment of converter, and the light signal can not produce other electrical equipment of radiation interference yet simultaneously, can strengthen greatly to the effect of signal isolation when adopting optic fibre transmission signal, also can not have the problem altogether, stable in structure, and the interference killing feature is strong.
Claims (7)
1. A circuit that DSP and generating line were kept apart which characterized in that: the bus is connected with the DSP control panel through the bus voltage sampling module and the optical fiber distribution plate, the optical fiber distribution plate sends signals of the bus voltage sampling module to the DSP control panel through optical fibers for signal acquisition, and the bus voltage sampling module comprises a divider resistor, a photoelectric coupler and an operational amplifier chip which are sequentially connected.
2. The DSP isolated from the bus of claim 1, wherein: and the bus voltage sampling module is connected with the optical fiber distribution plate through a connector.
3. The DSP isolated from the bus of claim 1, wherein: the voltage division resistor comprises a first resistor, a second resistor and a third resistor which are connected in series, and the divided voltage of the third resistor is isolated by a linear photoelectric coupler and then is subjected to sampling multiple processing by an operational amplifier chip and then is sent to the optical fiber distribution plate.
4. The DSP isolated from the bus of claim 1, wherein: and the optical fiber distribution board transmits the signal of the bus voltage sampling module to an A/D sampling interface of the DSP control board through optical fibers.
5. The DSP isolated from the bus of claim 1, wherein: and a voltage stabilizing diode is arranged between the photoelectric coupler and the third resistor.
6. The DSP isolated from the bus of claim 1, wherein: the front end of the photoelectric coupler is provided with a first filter capacitor.
7. The DSP isolated from the bus of claim 2 wherein: and a second filter capacitor is arranged at the front end of the connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167096.6U CN214427507U (en) | 2021-01-21 | 2021-01-21 | Circuit for isolating DSP (digital signal processor) from bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167096.6U CN214427507U (en) | 2021-01-21 | 2021-01-21 | Circuit for isolating DSP (digital signal processor) from bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214427507U true CN214427507U (en) | 2021-10-19 |
Family
ID=78057865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120167096.6U Active CN214427507U (en) | 2021-01-21 | 2021-01-21 | Circuit for isolating DSP (digital signal processor) from bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214427507U (en) |
-
2021
- 2021-01-21 CN CN202120167096.6U patent/CN214427507U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111721995A (en) | Isolation sampling circuit of direct current voltage signal | |
| CN105572453A (en) | Voltage acquisition electronic sensor apparatus | |
| CN201402293Y (en) | A distributed wireless high-voltage equipment insulation live test system | |
| CN214427507U (en) | Circuit for isolating DSP (digital signal processor) from bus | |
| CN201589806U (en) | Direct current isolation sampling device | |
| CN102710248A (en) | Isolated voltage acquisition circuit | |
| CN213069012U (en) | High voltage wire harness insulation testing device based on direct current | |
| CN202678082U (en) | Electronic transformer collector with overcurrent and overvoltage prevention function | |
| CN106684832A (en) | System for integrating protective current sampling and power supply | |
| CN216248208U (en) | Sampling output conversion device for GIS same-frequency same-phase voltage withstand test | |
| CN215954178U (en) | Current equalizing circuit of parallel power supply | |
| CN201666911U (en) | Voltage detecting device of medium- and high-voltage variable frequency speed governor | |
| CN201876485U (en) | Electronic transformer based on intelligent conditioning unit | |
| CN201171153Y (en) | DC protection test control apparatus | |
| CN110690757B (en) | Data monitoring device of electric power transmission and distribution system | |
| CN210669524U (en) | Intrinsic safety voltage limiting device of electronic unit | |
| CN220570320U (en) | Direct current traction relay protection device | |
| CN203101499U (en) | Voltage acquisition circuit | |
| CN209946250U (en) | Three-phase current acquisition circuit based on compensation circuit and acquisition device | |
| CN203179278U (en) | Sensor signal acquisition module based on optical fiber communication technology | |
| CN204903642U (en) | Combined high -pressure current measurement sensing device of lightning | |
| CN203178400U (en) | Short circuit and ground fault indicator and distribution automation system | |
| CN201335856Y (en) | Voltage-current converting circuit | |
| CN207281170U (en) | A kind of anti-interference impedance measurement system of substation | |
| CN101702369A (en) | Low voltage combined electronic transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |