CN220040577U - Voltage sampling device - Google Patents
Voltage sampling device Download PDFInfo
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- CN220040577U CN220040577U CN202223610295.3U CN202223610295U CN220040577U CN 220040577 U CN220040577 U CN 220040577U CN 202223610295 U CN202223610295 U CN 202223610295U CN 220040577 U CN220040577 U CN 220040577U
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- 238000005070 sampling Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 93
- 230000003287 optical effect Effects 0.000 claims abstract description 39
- 238000002955 isolation Methods 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000004146 energy storage Methods 0.000 claims abstract description 27
- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000036039 immunity Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000008054 signal transmission Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a voltage sampling device, which comprises an isolated power supply module, a voltage detection conversion module, a photoelectric conversion module and a power circuit, wherein the isolated power supply module is connected with the voltage detection conversion module; the power circuit comprises an energy storage unit, a power conversion unit and a control unit; the isolation power supply module is used for outputting a required power supply for the voltage detection conversion module after isolating the power supply; the voltage detection conversion module is used for detecting the voltages at two ends of the energy storage unit, converting the voltages into optical signals after isolation, and transmitting the optical signals to the photoelectric conversion module; the photoelectric conversion module is used for converting the received optical signal into an electric signal and transmitting the electric signal to the control unit voltage sampling device. According to the voltage sampling device, the voltages at the two ends of the energy storage unit are converted into optical signals, the optical signals are converted into low-voltage signals after being transmitted through the optical fibers, and the control unit monitors the voltage state of the direct-current bus in real time according to the electric signals; the sampling detection has high immunity, high isolation and common applicability.
Description
Technical Field
The utility model relates to the technical field of power conversion, in particular to a voltage sampling device.
Background
In the converter, when the voltage of the direct current bus is abnormal, the controller can make a judgment to cause the system to execute a protection action or stop. In some high-reliability application occasions, abnormal system state caused by sampling interference should be reduced as much as possible; on the other hand, the abnormal direct current bus voltage is accurately judged, and the protection action is timely carried out, so that secondary faults and fault expansion can be prevented.
The real-time and accurate detection and judgment of the voltage of the direct current bus are key points for the integral protection of the system. The current general detection method has great limitation: on one hand, the high immunity is not realized, and the existing detection circuit has poor immunity in a high-voltage environment through electric signal transmission; on the other hand, the isolation is poor, the existing detection circuit can not realize reliable isolation between a power supply and a high-voltage circuit through electric signal transmission, and the safety is poor.
Disclosure of Invention
The utility model provides a voltage sampling device which solves the problem that the existing sampling circuit is poor in noise immunity and isolation.
The utility model provides a voltage sampling device, which comprises an isolated power supply module, a voltage detection conversion module, a photoelectric conversion module and a power circuit, wherein the isolated power supply module is connected with the voltage detection conversion module;
the power circuit comprises an energy storage unit, a power conversion unit and a control unit, wherein the energy storage unit is connected with a direct-current end of the power conversion unit, and the power conversion unit comprises at least one semiconductor power device;
the isolation power supply module is used for outputting a required power supply for the voltage detection conversion module after isolating a power supply;
the voltage detection conversion module is used for detecting the voltages at two ends of the energy storage unit, converting the voltages into optical signals after isolation, and transmitting the optical signals to the photoelectric conversion module;
the photoelectric conversion module is used for converting the received optical signals into electric signals and transmitting the electric signals to the control unit so that the control unit can execute protection action when the voltages at the two ends of the energy storage unit are abnormal.
In an example, the energy storage unit and the power conversion unit form one of an I-shaped three-level topological circuit, a T-shaped three-level topological circuit, a Vienna-Like three-level topological circuit, a two-level converter topological circuit and an energy discharge topological circuit.
In an example, the isolation power module comprises an isolation transformer and a power conversion unit, one end of the isolation transformer is connected with the power supply, and the other end of the isolation transformer is connected with the power conversion unit;
the isolation transformer is used for isolating the power supply from a later-stage circuit; the power supply conversion unit is used for outputting a required power supply for the voltage detection conversion module.
In an example, the voltage detection conversion module includes a signal conditioning unit and a signal conversion unit;
the signal conditioning unit is used for detecting the voltages at two ends of the energy storage unit, converting the detected voltages into voltage state signals and outputting the voltage state signals to the signal conversion unit;
the signal conversion unit is used for converting the voltage state signal output by the signal conditioning unit into an optical signal and transmitting the optical signal to the photoelectric conversion module through an optical fiber.
In an example, the signal conditioning unit includes a voltage dividing circuit, an optocoupler isolation circuit, a differential amplifying circuit, and an overvoltage comparing circuit;
the voltage dividing circuit is used for conditioning the voltages at two ends of the energy storage unit into low-voltage signals;
the optical coupling isolation circuit is used for performing optical coupling isolation processing on the low-voltage signal output by the voltage division circuit so as to obtain an isolated signal;
the differential amplifying circuit is used for carrying out differential amplification processing on the isolated signals and then sending the signals to the signal conversion unit;
and the overvoltage comparison circuit is used for comparing the voltage signal output by the differential amplification circuit with a threshold value or a threshold value set by the signal conversion unit so as to judge the voltage state of the direct current bus and further output a voltage state signal.
In an example, the signal conversion unit includes a sampling unit, a level conversion unit, a data processing unit, and a first transmission unit;
the sampling unit is connected with the signal conditioning unit and is used for collecting the voltage signal output by the signal conditioning unit;
the level conversion unit is used for converting the voltage signal acquired by the sampling unit into an interface level of the data processing unit;
the data processing unit is used for converting the voltage state signal output by the signal conditioning unit into an optical signal;
the first transmission unit is used for transmitting the optical signal to the photoelectric conversion module through an optical fiber.
In an example, the photoelectric conversion module includes a second transmission unit and a signal processing unit;
the second transmission unit is connected with the voltage detection conversion module through an optical fiber and is used for receiving the optical signals transmitted by the voltage detection conversion module;
the signal processing unit is used for converting the optical signal received by the second transmission unit into an electric signal and transmitting the electric signal to the control unit.
In an example, the signal processing unit is configured to communicate electrical signals to the control unit via a backplane.
In an example, the second transmission unit communicates with the voltage detection conversion module by using PTP communication protocol.
In an example, the signal processing unit includes a data processing unit and a buffer circuit, where the data processing unit is configured to complete data reading processing of the optical signal and send a voltage signal through a port; the buffer circuit is used for buffering the electric signals of the control unit and the second transmission unit.
According to the voltage sampling device, the voltages at the two ends of the energy storage unit are converted into optical signals, the optical signals are converted into low-voltage signals after being transmitted through the optical fibers, and the control unit monitors the voltage state of the direct-current bus in real time according to the electric signals; the sampling detection has high immunity, high isolation and common applicability.
Drawings
Fig. 1 is a schematic diagram of a voltage sampling apparatus according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of an energy storage unit and a power conversion unit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a signal conditioning unit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a signal conversion unit according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a specific circuit of a signal conditioning unit and a signal conversion unit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a photoelectric conversion module according to an embodiment of the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a voltage sampling device according to an embodiment of the present utility model includes an isolated power module 10, a voltage detection and conversion module 20, a photoelectric conversion module 30, and a power module 40.
The power module 40 includes an energy storage unit 41, a power conversion unit 42, and a control unit 43.
In an example, as shown in fig. 2, the energy storage unit 41 and the power conversion unit 42 form an I-shaped three-level topology circuit, the energy storage unit 41 includes capacitors C1 and C2, and the power conversion unit 42 includes semiconductor power devices T1-T4 and diodes D1-D6. The semiconductor power devices T1-T4 include, but are not limited to, IGCT tubes, IGBT tubes, MOS tubes, and the like.
In other examples, the energy storage unit 41 and the power conversion unit 42 may be corresponding portions of a T-shaped three-level topology circuit, a Vienna-Like three-level topology circuit, a two-level converter topology circuit, an energy discharging topology circuit, and the Like. These topologies may convert ac to dc or dc to ac.
The isolated power module 10 includes an isolation transformer 11 and a power conversion unit 12. One end of the isolation transformer 11 is connected to an external power supply, for example, 220VAC, and the other end of the isolation transformer 11 is connected to the power conversion unit 12. The isolation transformer 11 is used to isolate the external power supply from the subsequent circuit, ensuring electrical safety. The power conversion unit 12 is configured to convert an external power supply into a power supply required by the voltage detection conversion module 20, for example, ±15V.
The voltage detection and conversion module 20 includes a signal conditioning unit 21 and a signal conversion unit 22.
The signal conditioning unit 21 is configured to detect a voltage (dc bus voltage) across the energy storage unit 41, that is, a voltage between the point P and the point N, convert the detected voltage into a voltage state signal, and output the voltage state signal to the signal converting unit 22. The voltage across the energy storage unit 41 will exhibit different voltage fluctuations depending on the operating state of the power conversion unit 42.
It should be noted that, in other examples, the signal conditioning unit 21 may also detect the voltage between other terminals, and is not limited to the voltage across the energy storage unit 41. For example: the system ac output voltage can be detected.
In an example, as shown in fig. 3, the signal conditioning unit 21 includes a voltage dividing circuit 211, an optocoupler isolation circuit 212, a differential amplifying circuit 213, and an overvoltage comparing circuit 214.
The voltage dividing circuit 211 is configured to condition the voltage across the energy storage unit 41 into a low voltage signal, i.e. into a real-time voltage signal with the same voltage level as the signal converting unit 22.
The optocoupler isolation circuit 212 is configured to perform optocoupler isolation processing on the real-time voltage signal output by the voltage division circuit 211, so as to obtain an isolated signal.
The differential amplifying circuit 213 is configured to perform differential amplification processing on the isolated signal and send the signal to the signal converting unit 22.
The overvoltage comparing circuit 214 is configured to compare the voltage signal output by the differential amplifying circuit 213 with a threshold value or a threshold value set by the signal converting unit 22, so as to determine a voltage state of the dc bus, and further output a voltage state signal.
The signal conversion unit 22 is configured to convert the voltage status signal output by the signal conditioning unit 21 into an optical signal, and transmit the optical signal to the photoelectric conversion module 30 through an optical fiber.
In one example, as shown in fig. 4, the signal conversion unit 22 includes a sampling unit 221, a level conversion unit 222, a data processing unit 223, and a transmission unit 224.
The sampling unit 221 is connected to the differential amplifying circuit 213, and is configured to collect a voltage signal output from the differential amplifying circuit 213. The sampling unit 221 may be implemented using an ADC sampling circuit.
The level conversion unit 222 is used for converting the voltage signal acquired by the sampling unit 221 into an interface level of the data processing unit 223.
The data processing unit 223 may be implemented by using an FPGA, and outputs a set threshold value or a set threshold value through the IO port on the one hand, and converts the voltage state signal output by the signal conditioning unit 21 into an optical signal on the other hand. The transmission unit 224 is configured to transmit the optical signal to the photoelectric conversion module 30 through an optical fiber.
Fig. 5 is a schematic diagram of specific circuits of the signal conditioning unit 21 and the signal converting unit 22.
The photoelectric conversion module 30 is configured to convert the received optical signal into an electrical signal and transmit the electrical signal to the control unit 43, so that the control unit 43 performs a protection action when an abnormality occurs in the dc bus voltage.
In an example, as shown in fig. 6, the photoelectric conversion module 30 includes a transmission unit 31 and a signal processing unit 32.
The transmission unit 31 and the transmission unit 224 transmit through optical fibers, and may use PTP communication protocol. The transmission unit 31 is configured to receive the optical signal transmitted by the transmission unit 224 through the optical fiber.
The signal processing unit 32 is configured to convert the optical signal received by the transmission unit 31 into an electrical signal, and transmit the electrical signal to the control unit 43 through backplane communication.
In further implementations, the signal processing unit 32 includes a data processing unit and a buffer circuit. The data processing unit is used for finishing the data reading processing of the optical signal and sending a voltage signal through the port. The buffer circuit is used for buffering the electric signals of the control unit 43 and the transmission unit 31.
Another embodiment of the present utility model provides a converter, including the voltage sampling device described in the foregoing embodiment.
The preferred embodiments of the present utility model have been described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present utility model shall fall within the scope of the appended claims.
Claims (10)
1. The voltage sampling device is characterized by comprising an isolated power supply module, a voltage detection conversion module, a photoelectric conversion module and a power circuit;
the power circuit comprises an energy storage unit, a power conversion unit and a control unit, wherein the energy storage unit is connected with a direct-current end of the power conversion unit, and the power conversion unit comprises at least one semiconductor power device;
the isolation power supply module is used for outputting a required power supply for the voltage detection conversion module after isolating a power supply;
the voltage detection conversion module is used for detecting the voltages at two ends of the energy storage unit, converting the voltages into optical signals after isolation, and transmitting the optical signals to the photoelectric conversion module;
the photoelectric conversion module is used for converting the received optical signals into electric signals and transmitting the electric signals to the control unit so that the control unit can execute protection action when the voltages at the two ends of the energy storage unit are abnormal.
2. The voltage sampling device of claim 1, wherein the energy storage unit and the power conversion unit form one of an "I" shaped three-level topology, a "T" shaped three-level topology, a "Vienna-Like" three-level topology, a two-level converter topology, and an energy bleed topology.
3. The voltage sampling device according to claim 1, wherein the isolation power module comprises an isolation transformer and a power conversion unit, one end of the isolation transformer is connected with the power supply, and the other end of the isolation transformer is connected with the power conversion unit;
the isolation transformer is used for isolating the power supply from a later-stage circuit; the power supply conversion unit is used for outputting a required power supply for the voltage detection conversion module.
4. The voltage sampling apparatus of claim 1, wherein the voltage detection conversion module comprises a signal conditioning unit and a signal conversion unit;
the signal conditioning unit is used for detecting the voltages at two ends of the energy storage unit, converting the detected voltages into voltage state signals and outputting the voltage state signals to the signal conversion unit;
the signal conversion unit is used for converting the voltage state signal output by the signal conditioning unit into an optical signal and transmitting the optical signal to the photoelectric conversion module through an optical fiber.
5. The voltage sampling apparatus of claim 4, wherein the signal conditioning unit comprises a voltage dividing circuit, an optocoupler isolation circuit, a differential amplification circuit, and an overvoltage comparison circuit;
the voltage dividing circuit is used for conditioning the voltages at two ends of the energy storage unit into low-voltage signals;
the optical coupling isolation circuit is used for performing optical coupling isolation processing on the low-voltage signal output by the voltage division circuit so as to obtain an isolated signal;
the differential amplifying circuit is used for carrying out differential amplification processing on the isolated signals and then sending the signals to the signal conversion unit;
and the overvoltage comparison circuit is used for comparing the voltage signal output by the differential amplification circuit with a threshold value or a threshold value set by the signal conversion unit so as to judge the voltage state of the direct current bus and further output a voltage state signal.
6. The voltage sampling apparatus according to claim 4, wherein the signal conversion unit comprises a sampling unit, a level conversion unit, a data processing unit, and a first transmission unit;
the sampling unit is connected with the signal conditioning unit and is used for collecting the voltage signal output by the signal conditioning unit;
the level conversion unit is used for converting the voltage signal acquired by the sampling unit into an interface level of the data processing unit;
the data processing unit is used for converting the voltage state signal output by the signal conditioning unit into an optical signal;
the first transmission unit is used for transmitting the optical signal to the photoelectric conversion module through an optical fiber.
7. The voltage sampling apparatus according to claim 1, wherein the photoelectric conversion module includes a second transmission unit and a signal processing unit;
the second transmission unit is connected with the voltage detection conversion module through an optical fiber and is used for receiving the optical signals transmitted by the voltage detection conversion module;
the signal processing unit is used for converting the optical signal received by the second transmission unit into an electric signal and transmitting the electric signal to the control unit.
8. The voltage sampling apparatus of claim 7, wherein the signal processing unit is configured to communicate electrical signals to the control unit via a backplane.
9. The voltage sampling apparatus according to claim 7, wherein the second transmission unit communicates with the voltage detection conversion module using PTP communication protocol.
10. The voltage sampling apparatus according to claim 7, wherein the signal processing unit includes a data processing unit for completing data reading processing of the optical signal and transmitting the voltage signal through the port; the buffer circuit is used for buffering the electric signals of the control unit and the second transmission unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223610295.3U CN220040577U (en) | 2022-12-30 | 2022-12-30 | Voltage sampling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223610295.3U CN220040577U (en) | 2022-12-30 | 2022-12-30 | Voltage sampling device |
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| CN220040577U true CN220040577U (en) | 2023-11-17 |
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| CN202223610295.3U Active CN220040577U (en) | 2022-12-30 | 2022-12-30 | Voltage sampling device |
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| CN (1) | CN220040577U (en) |
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