CN201918010U - Voltage-current collecting and transmitting device for high-voltage system - Google Patents
Voltage-current collecting and transmitting device for high-voltage system Download PDFInfo
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- CN201918010U CN201918010U CN2010206884554U CN201020688455U CN201918010U CN 201918010 U CN201918010 U CN 201918010U CN 2010206884554 U CN2010206884554 U CN 2010206884554U CN 201020688455 U CN201020688455 U CN 201020688455U CN 201918010 U CN201918010 U CN 201918010U
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Abstract
The utility model relates to a voltage-current collecting and transmitting device for a high-voltage system, which comprises a voltage signal detecting circuit, a current signal detecting circuit, a signal conversion circuit and a signal transmission circuit. A voltage sensor and a current sensor collect analog signals of voltage and current in a main circuit of a high-voltage large-power electric-power electronic system, the collected signals are filtered by a filter circuit in the signal conversion circuit, and then analog-to-digital conversion is processed on the signals through an analog-to-digital conversion circuit. A complex programmable logic device (CPLD) controls the digital-to-analog conversion and reads data, the data is converted to a square signal with a fixed period and with a duty ratio being changed along with the data read by the CPLD, then the square signal is transmitted to the signal transmission circuit at a fixed frequency through an optical fiber, the pulse width of the received square signal is calculated through the control of a field programmable gate array (FPGA) chip, the number value of the collected signal is obtained by converting the pulse width, so the collection of the voltage signal and the current signal is completed, and the voltage signal and the current signal are isolated to transmit.
Description
Technical field
The utility model relates to a kind of signals collecting and transmitting device that is used for high-voltage and high-power power electronic converter system.
Background technology
Along with the continuous development of high-power power equipment, the detection of signal must be isolated transmission, in order to avoid be interfered, also is a kind of requirement of security of system simultaneously.Such as in high-voltage and high-power power electronic converter system, the main circuit topology that adopts mainly contains: diode clamp formula multi-level converter, striding capacitance formula multi-level converter, Cascade H bridge type transducer and modular multilevel transformer configuration, all need to gather a large amount of voltage and current signals, system's electromagnetic environment complexity, electromagnetic interference (EMI) is very strong to the influence of signal, if acquired signal is unreliable, the reliability service of just be far from being control and system.In the present existing similar device, it all is simulating signal with the high voltage or the electric current of outside, behind signal deteching circuit, through the voltage-frequency change-over circuit, voltage signal is become frequency signal, and then, frequency signal is become voltage signal again, just a kind of demodulating process of signal by frequency-voltage conversion circuit; Perhaps by the voltage-frequency change-over circuit, frequency signal is passed through wireless transmission, through complicated host-host protocol signal is sent, receiving end by modulation-demodulation circuit, is transformed into voltage signal with frequency signal, even ready-made conversion chip is arranged again, also can make total system become very complicated, and frequency signal is easy to be subjected to the influence of complex electromagnetic environment, and the data that collect are not necessarily accurate, increased the unreliability of system's control.
Chinese patent 02144877.9 relates to a kind of voltage-current sensor that is applied to electric system, with the voltage signal obtained on the current signal obtained and the resistance through the frequency-conversion circuit conversion, pass through optocoupler, optical fiber or transformer isolation again after.Through the demodulation of frequency-conversion circuit, finish the measuring ability of signal at last again.We directly adopt existing digit chip, signal is become square-wave signal, send by optical fiber, the take over party obtains square-wave signal, as long as read out pulse width, just obtain the size information of acquired signal, there is not complicated demodulator circuit, make entire system more reliable, be fit to the high-power system and use.
Chinese patent 200710121174.3 relates to a kind of voltage-current sensor that is applied to electric system, be from conductor, directly to obtain signal on current signal and the resistance, through special wafer and laser, voltage signal is modulated into the particular frequencies signal by signal modulator, passes the signal to host computer by translation circuit.This device can reasonablely reach jamproof purpose really, but device is not very general to the having relatively high expectations of manufacturing materials, and signal must pass through modulation, has increased the complicacy of system, the relative reliability that has also just reduced system.
In the high-power system, the general main circuit structure that all can adopt more complicated, need the voltage and current signal of collection many, even also have a lot of signals such as temperature also will gather, in this case, send out if think the mass data that will gather, need complicated host-host protocol, can increase the difficulty of control, even can cause losing and asynchrony phenomenon of data, therefore the control of system can't be accomplished accurately.
The utility model content
The purpose of this utility model is the shortcoming that overcomes prior art, proposes a kind of voltage, current acquisition and isolation transmission device that is applicable to high-pressure system.The utility model is voltage, current signal collection and the isolation transmission device at a kind of high-tension electricity electronic system of modular multilevel transformer configuration design, its signal sampling is not subject to the influence of complex electromagnetic environment, can accomplish accurate acquired signal, isolate transmission, do not have complicated host-host protocol simultaneously, simplified the complexity of high-pressure system control greatly.Data acquisition and transmission mode that the utility model adopts do not have complicated voltage-frequency conversion, do not have the modulation link of data yet, can gather multiple signals simultaneously, and the accuracy height is for the accurate control of high-pressure system provides safeguard.The utility model is applicable to the high-power occasion, also is applicable to the collection of carrying out signal in other high-power systems and isolates transmission.
The utility model comprises the testing circuit of voltage, current signal, signaling conversion circuit and signal circuit circuit.
The testing circuit of described voltage, current signal is by the voltage sensor and the current sensor of voltage levels, and a direct supply is formed.The direct supply of testing circuit part, can export the d. c. voltage signal of different electric pressures simultaneously, the d. c. voltage signal that sensor needs is transferred to the power input of voltage sensor and current sensor by cable with voltage signal, for the voltage sensor and the current sensor of testing circuit part provides working power; Direct supply with different voltage signals, is transferred to the power end of electron device in signaling conversion circuit and the signal circuit, for electron device provides working power by circuit board wiring.Voltage sensor is fixed near the high voltage signal of the high-voltage and high-power power electronic system that needs collection.In the signal deteching circuit, high voltage is connected to the former limit input end of voltage sensor, constant current source signal of analog signal output output from voltage sensor, through a sampling resistor, the high voltage that the needs of high-voltage and high-power power electronic system are detected is transformed into+voltage signal of 5V a little less than one between-the 5V, be sent to the signaling conversion circuit input end by shielded cable.The detection of current signal is the principle by mutual inductor, and the connection lead in the main circuit is passed current sensor, and current sensor will need the current conversion of the high-voltage and high-power power electronic system that detects to become a constant current source signal.
The change-over circuit of described signaling conversion circuit signal comprises filtering circuit and analog to digital conversion circuit.The simulating signal that described signal deteching circuit obtains, be sent to filtering circuit input end in the signaling conversion circuit by cable, through the analog input mouth of filtered analog signal transmission to analog to digital conversion AD chip, by programmable logic device (CPLD) control analog to digital conversion AD chip operation, the simulating signal of outside is become digital signal, and the data of correspondence are existed in the programmable logic device (CPLD), then the transformation of data that collects is become a square-wave signal, be input to signal transmission input end.
Described signal circuit comprises signal sending circuit and signal receiving circuit.In order to reach the isolation on electric, the data of being gathered transmit by optical fiber, convert square wave voltage signal to light signal, send to signal receiving end by optical fiber.
The utility model utilizes Digital Control, voltage signal is become simple and reliable square-wave signal, send by optical fiber, remove the frequency of signal and pressed conversion links, avoided frequency signal to be subject to the influence of external electromagnetic environment, also do not needed complicated host-host protocol, reliability improves, compactness simple for structure, signal strong interference immunity, reliability height.
The utlity model has following characteristics:
1. can realize real-time, the reliable collection of high voltage occasion multiple signals;
2. to the simulating signal of sensor input, by digital control, realize the conversion of data, error is little, and precision can be controlled;
3. the transmission course of signal has been avoided complicated host-host protocol, does not need to add the demodulator circuit of signal, has also eliminated simultaneously voltage signal is become transmission again behind the frequency signal, is subject to the drawback of complex electromagnetic environment influence, can accomplish the Signal Spacing transmission.
Description of drawings
Fig. 1 the utility model structured flowchart;
Fig. 2 is the simulating signal filtering circuit of conversion of signals part;
Fig. 3 is the analog to digital conversion circuit block diagram of conversion of signals part;
Fig. 4 is the transmission circuit of signal;
Fig. 5 square-wave signal forms the synoptic diagram of mechanism.
Embodiment
Further specify the utility model below in conjunction with the drawings and specific embodiments.
The utility model comprises testing circuit, signaling conversion circuit and the signal circuit of voltage, current signal.
As shown in Figure 1, the testing circuit of signal mainly comprises voltage sensor and current sensor and direct supply.Signaling conversion circuit comprises filtering circuit and analog to digital conversion circuit.Signal circuit comprises signal sending circuit and signal receiving circuit.
The utility model is by the simulating signal of the voltage and current in voltage sensor and the current sensor acquisition main circuit, and the simulating signal of being gathered is through the filtering circuit filtering in the signaling conversion circuit.Filtering circuit output connects 12 AD chip dies analog signal input port in the analog to digital conversion circuit, simulating signal is carried out analog to digital conversion by the AD chip of 12 of programmable logic device (CPLD) controls, and mistake CPLD reading of data, become one-period to fix data-switching, the square-wave signal that the size of data that dutycycle reads with CPLD changes, data are big more, dutycycle is also big more, pass through signal circuit then, send to the square-wave signal receiving end of signal circuit by optical fiber with fixing frequency, receiving end receives square-wave signal, send to the input end of the signal receiving circuit in the transmission circuit of signal by optical fiber with fixing frequency, the input end of signal receiving circuit receives square-wave signal, by the control of signal receiving circuit by the on-site programmable gate array FPGA chip, calculate the pulse width of the square-wave signal that receives, again through converting, obtain the numerical values recited of acquired signal, finish data acquisition, realize to isolate transmission simultaneously, use for high high-voltage and high-power power electronic system.The direct supply of testing circuit part, can export the d. c. voltage signal of different electric pressures simultaneously, the d. c. voltage signal that sensor needs is transferred to the power input of voltage sensor and current sensor by cable with voltage signal, for the voltage sensor and the current sensor of testing circuit part provides working power; Direct supply with different voltage signals, is transferred to the power end of electron device in signaling conversion circuit and the signal circuit, for electron device provides working power by circuit board wiring.
Figure 2 shows that the filtering circuit in the signaling conversion circuit.In order to reduce the high frequency interference on the simulating signal, the simulating signal of sensor output is transferred to the analog input mouth of 12 AD chip after filtering.Can adopt different bandwidth to carry out filtering at the signal of different frequency, should guarantee that signal is undistorted, also will reduce the high frequency interference information in the signal simultaneously.The simulating signal Xin of sensor output by cable transmission to an end of first resistance R 1 and an end of second resistance R 2, another termination simulation ground of first resistance R 1, the other end of second resistance R 2 is connected to the upper end of the 4th resistance R 4 and first capacitor C 1, the other end of second resistance R 2 is connected to 2 pin of amplifier TLC2264A1D simultaneously, 3 pin of amplifier TLC2264A1D link to each other with the upper end of the 3rd resistance R 3, the following termination simulation ground of the 3rd resistance R 3,1 pin of TLC2264A1D links to each other with the lower end of the 4th resistance R 4 and first capacitor C 1 simultaneously, one end of the 5th resistance R 5 and 1 pin of TLC2264A1D link to each other, 6 pin of the other end of R5 and TLC2264A1D link to each other, 5 pin of TLC2264A1D link to each other with an end of the 6th resistance R 6, the other end of R6 links to each other with simulation ground, 6 pin of TLC2264A1D link to each other with the end of the 7th resistance R 7 with second capacitor C 2 simultaneously, the other end of the 7th resistance R 7 and second capacitor C 2 and 7 pin of TLC2264A1D link to each other, and produce filtered simulating signal.
Figure 3 shows that the analog to digital conversion circuit block diagram in the signaling conversion circuit, analog to digital conversion circuit is made up of 12 AD chip and CPLD chip.Through filtered simulating signal, be transferred to the input end of analog signal of 12 AD chip, the I/O port of CPLD links to each other with the pin that enables of AD chip, and the AD chip that starts 12 carries out analog to digital conversion.The data line of 12 AD chips is connected with the second to the 13 I/O mouth of CPLD chip respectively with address wire, realizes between the two that parallel data transmits.12 AD chip convert the 14 I/O port that output signal is connected to the CPLD chip, the convert signal judgment of CPLD chip by 12 AD chip is sent carried out the read data operation.After the CPLD reading of data, become one-period to fix data-switching, the square-wave signal that the size of data that dutycycle reads with CPLD changes.
Be illustrated in figure 4 as signal circuit, signal circuit comprises signal sending circuit and signal receiving circuit.Signal sending circuit is made of SN75451 chip and fiber optic transmitter HFBR-1528 device and resistance; Signal receiving circuit is made of fiber optic transmitter HFBR-2528 device and resistance, electric capacity.At first realize opto-electronic conversion, voltage signal is transformed into light signal, go out by Optical Fiber Transmission then by signal sending circuit.The 15 I/O mouth of CPLD chip is connected to 2 pin with door SN75451 chip, 1 pin of SN75451 chip is connected to power supply+5V, link to each other with the end of first resistance R 1 simultaneously with second resistance R 2, the other end of first resistance R 1 is connected to 1 pin of fiber optic transmitter HFBR-1528 device, 3 pin of another termination SN75451 chip of second resistance R 2,3 pin of SN75451 chip are connected to 2 pin of HFBR-1528 device among Fig. 4 simultaneously, and 3,4,5 pin of HFBR-1528 device connect digitally simultaneously.The HFBR-1528 device converts the electrical signal to light signal, light signal is sent to the input end of fiber optic receiver HFBR-2528 through optical fiber; Fiber optic receiver HFBR-2528 is transformed into electric signal with the light signal that receives, 1 pin of fiber optic receiver HFBR-2528 device is transferred to electric signal in the I/O mouth of FPGA, the end of 1 pin connecting resistance Ro of HFBR-2528 device, another termination direct supply of Ro+the 5V end, 2,4,8 pin of HFBR-2528 device connect digitally simultaneously, 3 pin of HFBR-2528 device connect direct supply+5V end, connect a filter capacitor C between 2,3 pin of HFBR-2528 device.On-site programmable gate array FPGA calculates the width of the square-wave signal that receives, and converts, and just obtains the analog signal values of collection, finishes the collection of data and isolates transmission, can accomplish that error is little, is not subjected to the influence of complex electromagnetic environment.
As shown in Figure 5, adopt the digital signal that obtains after 12 the AD chip conversion in the utility model, control by CPLD, to convert the 100s fixed cycle to from the different numerical value that AD reads and the different square-wave signal of dutycycle, frequency with 20kHz sends then, the FPGA of receiving end calculates the size of square wave with the clock frequency of 50MHz, the digital signal that obtains so just can converse the size of value of the simulating signal of collection through certain proportionate relationship, because the clock period of FPGA is very little, so the square-wave pulse width that calculates is more accurate, the information of the acquired signal that obtains can not have influence on the control of system, and the error range of signal satisfies the requirement of system's control.
Claims (5)
1. voltage, current acquisition and transmitting device that is used for high-pressure system, it is characterized in that: described collection and transmitting device comprise signal deteching circuit, signaling conversion circuit and the signal circuit of voltage, electric current; Described signal deteching circuit comprises voltage sensor and current sensor and direct supply; Signaling conversion circuit comprises filtering circuit and analog to digital conversion circuit; Signal circuit comprises signal sending circuit and signal receiving circuit; Direct supply voltage is voltage sensor and current sensor, and electron device provides working power in signaling conversion circuit and the signal circuit; Voltage sensor and current sensor are gathered the simulating signal of the voltage and current in the high-voltage and high-power power electronic system main circuit, and described simulating signal is carried out analog to digital conversion through the filtering circuit filtering in the signaling conversion circuit through analog to digital conversion circuit; Programmable logic device (CPLD) control digital-to-analog conversion and reading of data, become one-period to fix data-switching, the square-wave signal that the size of data that dutycycle reads with CPLD changes, pass through signal circuit again, send to the input end of the signal receiving circuit in the transmission circuit of signal by optical fiber with fixing frequency, the input end of signal receiving circuit receives square-wave signal, control by the on-site programmable gate array FPGA chip in the signal receiving circuit, calculate the pulse width of the square-wave signal of receiving, through converting, obtain the numerical values recited of acquired signal, finish data acquisition, and isolate transmission.
2. voltage, current acquisition and the transmitting device that is used for high-pressure system as claimed in claim 1, it is characterized in that in the described signal deteching circuit, high voltage signal is transferred to the former limit input port of voltage sensor, transfer out a constant current source signal from the secondary output terminal of voltage sensor, through a sampling resistor, the constant current source signal is become low voltage signal, and the voltage signal that will need to detect by cable is sent to the change-over circuit input end of signal, finishes the detection of voltage signal; The detection of current signal, it is principle by mutual inductor, connection lead in the main circuit is passed current sensor, obtain constant current source from the secondary of current sensor, through sampling resistor, the constant current source signal transition is become low voltage signal,, finish the detection of current signal by the change-over circuit input end of cable transmission to signal.
3. the voltage that is used for high-pressure system as claimed in claim 1 or 2, current acquisition and transmitting device, it is characterized in that in the described filtering circuit, the simulating signal Xin of described voltage sensor and current sensor output by cable transmission to an end of first resistance R 1 and an end of second resistance R 2, another termination simulation ground of first resistance R 1, the other end of second resistance R 2 is connected to the upper end of the 4th resistance R 4 and first capacitor C 1, the other end of second resistance R 2 is connected to 2 pin of amplifier TLC2264A1D simultaneously, 3 pin of amplifier TLC2264A1D link to each other with the upper end of the 3rd resistance R 3, the following termination simulation ground of the 3rd resistance R 3,1 pin of TLC2264A1D links to each other with the lower end of the 4th resistance R 4 and first capacitor C 1 simultaneously, one end of the 5th resistance R 5 and 1 pin of TLC2264A1D link to each other, 6 pin of the other end of R5 and TLC2264A1D link to each other, 5 pin of TLC2264A1D link to each other with an end of the 6th resistance R 6, the other end of R6 links to each other with simulation ground, 6 pin of TLC2264A1D link to each other with the end of the 7th resistance R 7 with second capacitor C 2 simultaneously, the other end of the 7th resistance R 7 and second capacitor C 2 and 7 pin of TLC2264A1D link to each other, and produce filtered simulating signal.
4. the voltage that is used for high-pressure system as claimed in claim 1, current acquisition and transmitting device, it is characterized in that in the described analog to digital conversion circuit, described filtered voltage, current analog signal is sent to the input end of analog signal of 12 analog to digital conversion AD chip, the one I/O port of programmable logic device (CPLD) links to each other with the pin that enables of analog to digital conversion AD chip, the data line of analog to digital conversion AD chip is connected with the second to the 13 I/O mouth of programmable logic device (CPLD) respectively with address wire, the output signal of analog to digital conversion AD chip is connected to the 14 I/O port of programmable logic device (CPLD), the convert signal judgment of programmable logic device (CPLD) by analog to digital conversion AD chip is sent carried out the read data operation; After the programmable logic device (CPLD) reading of data, become one-period to fix data-switching, the square-wave signal that the size of data that dutycycle reads with programmable logic device (CPLD) changes.
5. the voltage that is used for high-pressure system as claimed in claim 1, current acquisition and transmitting device, it is characterized in that in the described signal circuit, the 15 I/O mouth of programmable logic device (CPLD) chip is connected to 2 pin with door SN75451 chip, be connected to power supply+5V with 1 pin of door SN75451 chip, link to each other with the end of first resistance R 1 simultaneously with second resistance R 2, the other end of first resistance R 1 is connected to 1 pin of fiber optic transmitter HFBR-1528, another termination of second resistance R 2 and 3 pin of SN75451 chip, be connected to 2 pin of fiber optic transmitter HFBR-1528 simultaneously with 3 pin of door SN75451 chip, 3 of fiber optic transmitter HFBR-1528,4,5 pin connect digitally simultaneously; Convert the electrical signal to light signal by the HFBR-1528 device, be sent to the input end of fiber optic receiver HFBR-2528 through optical fiber; Fiber optic receiver HFBR-2528 is transformed into electric signal with the light signal that receives, 1 pin of fiber optic receiver HFBR-2528 device is transferred to electric signal in the I/O mouth of chip FPGA, the end of 1 pin connecting resistance Ro of HFBR-2528 device, another termination direct supply of Ro+the 5V end, 2,4,8 pin of HFBR-2528 device connect digitally simultaneously, 3 pin of HFBR-2528 device connect direct supply+5V end, connect a filter capacitor C between 2,3 pin of HFBR-2528 device. On-site programmable gate array FPGA calculates the width of the square-wave signal that receives, and converts, and obtains the analog signal values of gathering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206884554U CN201918010U (en) | 2010-12-17 | 2010-12-17 | Voltage-current collecting and transmitting device for high-voltage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206884554U CN201918010U (en) | 2010-12-17 | 2010-12-17 | Voltage-current collecting and transmitting device for high-voltage system |
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| CN201918010U true CN201918010U (en) | 2011-08-03 |
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| CN2010206884554U Expired - Lifetime CN201918010U (en) | 2010-12-17 | 2010-12-17 | Voltage-current collecting and transmitting device for high-voltage system |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513121A (en) * | 2012-06-26 | 2014-01-15 | 艾默生网络能源有限公司 | Method for determining sampling application value of electrical signal and device thereof |
| CN104299408A (en) * | 2014-11-04 | 2015-01-21 | 国家电网公司 | Temperature monitoring device for high-voltage electrical equipment |
| CN106603080A (en) * | 2016-12-30 | 2017-04-26 | 西安奇维科技有限公司 | Analog signal isolation and acquisition circuit |
| US9797932B2 (en) | 2014-06-11 | 2017-10-24 | Delta Electronics (Shanghai) Co., Ltd. | Voltage sampling system |
| CN108132378A (en) * | 2018-02-10 | 2018-06-08 | 武汉科力源电气有限公司 | voltage detecting circuit and device |
| CN108832929A (en) * | 2018-05-28 | 2018-11-16 | 重庆川仪自动化股份有限公司 | Low power consumption high-precision analog quantity isolation circuit |
| CN109217928A (en) * | 2018-10-23 | 2019-01-15 | 中国科学院合肥物质科学研究院 | A kind of method that analog signal is transmitted at a distance |
| CN110488065A (en) * | 2019-09-03 | 2019-11-22 | 大连理工大学 | A kind of high-voltage signal acquisition system based on optical fiber transmission |
| CN111624396A (en) * | 2020-05-13 | 2020-09-04 | 新风光电子科技股份有限公司 | Current isolation acquisition device for 35kV direct hanging type SVG |
| CN111679117A (en) * | 2020-06-09 | 2020-09-18 | 国网山东省电力公司检修公司 | Broadband 35kv voltage measuring device and method |
| CN112332924A (en) * | 2020-10-10 | 2021-02-05 | 武汉阿帕科技有限公司 | High-voltage tower communication device and method |
| CN112684245A (en) * | 2020-12-29 | 2021-04-20 | 卡斯柯信号有限公司 | Multi-path direct current voltage and current measuring and displaying device |
| CN113156197A (en) * | 2021-05-25 | 2021-07-23 | 中国工程物理研究院机械制造工艺研究所 | Pulse power supply data acquisition system |
| CN114595176A (en) * | 2022-02-21 | 2022-06-07 | 北京中科银河芯科技有限公司 | Data communication system, method and equipment based on chip power consumption |
| CN116499500A (en) * | 2023-06-28 | 2023-07-28 | 珠海矽敏科技有限公司 | Sensor system, sensor, signal output circuit of sensor and signal acquisition equipment |
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2010
- 2010-12-17 CN CN2010206884554U patent/CN201918010U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513121A (en) * | 2012-06-26 | 2014-01-15 | 艾默生网络能源有限公司 | Method for determining sampling application value of electrical signal and device thereof |
| US9797932B2 (en) | 2014-06-11 | 2017-10-24 | Delta Electronics (Shanghai) Co., Ltd. | Voltage sampling system |
| CN104299408A (en) * | 2014-11-04 | 2015-01-21 | 国家电网公司 | Temperature monitoring device for high-voltage electrical equipment |
| CN106603080A (en) * | 2016-12-30 | 2017-04-26 | 西安奇维科技有限公司 | Analog signal isolation and acquisition circuit |
| CN108132378A (en) * | 2018-02-10 | 2018-06-08 | 武汉科力源电气有限公司 | voltage detecting circuit and device |
| CN108832929A (en) * | 2018-05-28 | 2018-11-16 | 重庆川仪自动化股份有限公司 | Low power consumption high-precision analog quantity isolation circuit |
| CN109217928A (en) * | 2018-10-23 | 2019-01-15 | 中国科学院合肥物质科学研究院 | A kind of method that analog signal is transmitted at a distance |
| CN110488065A (en) * | 2019-09-03 | 2019-11-22 | 大连理工大学 | A kind of high-voltage signal acquisition system based on optical fiber transmission |
| CN111624396A (en) * | 2020-05-13 | 2020-09-04 | 新风光电子科技股份有限公司 | Current isolation acquisition device for 35kV direct hanging type SVG |
| CN111679117A (en) * | 2020-06-09 | 2020-09-18 | 国网山东省电力公司检修公司 | Broadband 35kv voltage measuring device and method |
| CN112332924A (en) * | 2020-10-10 | 2021-02-05 | 武汉阿帕科技有限公司 | High-voltage tower communication device and method |
| CN112684245A (en) * | 2020-12-29 | 2021-04-20 | 卡斯柯信号有限公司 | Multi-path direct current voltage and current measuring and displaying device |
| CN113156197A (en) * | 2021-05-25 | 2021-07-23 | 中国工程物理研究院机械制造工艺研究所 | Pulse power supply data acquisition system |
| CN114595176A (en) * | 2022-02-21 | 2022-06-07 | 北京中科银河芯科技有限公司 | Data communication system, method and equipment based on chip power consumption |
| CN114595176B (en) * | 2022-02-21 | 2024-06-21 | 北京中科银河芯科技有限公司 | Data communication system, method and equipment based on chip power consumption |
| CN116499500A (en) * | 2023-06-28 | 2023-07-28 | 珠海矽敏科技有限公司 | Sensor system, sensor, signal output circuit of sensor and signal acquisition equipment |
| CN116499500B (en) * | 2023-06-28 | 2024-01-30 | 珠海矽敏科技有限公司 | Sensor system, sensor, signal output circuit of sensor and signal acquisition equipment |
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