CN104917547A - TPLC based power line power frequency communication system - Google Patents
TPLC based power line power frequency communication system Download PDFInfo
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Abstract
The invention discloses a TPLC based power line power frequency communication system, which is characterized in that the system is installed under each transformer area, a master module is installed at a concentrator, and a slave module is installed at each terminal meter; the master module is provided with an inbound signal detection circuit, an outbound signal modulation circuit and a processor; each slave module is provided with an inbound signal modulation circuit, an outbound signal demodulation circuit and a processor; and the concentrator sends outbound signals to the slave modules through the master module and detects inbound signals sent by the slave modules, and each terminal meter sends the inbound signals to the master module through the slave module and detects the outbound signals sent by the master module. According to the invention, the modulated pulse signal frequency is far lower than the conventional power carrier signal frequency, the system is not susceptible to influences of impedance of a power distribution network, low-frequency signals are not attenuated, the transmission distance is greatly increased, power grid noise energy in a corresponding frequency band is small, the communication success rate is much higher than that of a traditional carrier communication method, point-to-point communication is used directly, networking is not required, and network topology is simple.
Description
Technical field
The present invention relates to power line transmission field, be specifically related to a kind of power-frequency communication of electric system.
Background technology
TPLC is the power line communication technology based on TWACS technology; TWACS is Two Way Automatic Communication System (Two-Way Automated Communications System), is the modulation and demodulation utilizing the method for power-frequency voltage first-harmonic zero-cross modulation to realize signal.But traditional TWACS communication host node is mounted in the intermediate voltage terminal of transformer station's distribution transformer, adopts the form of voltage modulated to send a signal to from node; From node installation in low-voltage customer side, adopt the form of current-modulation to send a signal to host node, host node is by CT(current transformer) by signal extraction out.The transmission of signal all needs to cross over platform district transformer, and the low-voltage collecting meter reading system in units of the kilowatt meter reading-out system Dou Shiyitai district of current China Power Grids, also additional not special CT, current-modulation therefore can not be used to send signal, and traditional TWACS cannot meet the requirement of China Power Grids kilowatt meter reading-out system.
How to realize the long-distance transmissions of power line communication, raising communication reliability and antijamming capability are the emphasis that scientific research personnel studies always.A kind of modulation signal based on power line of the Introduction To Cn Patent of the patent No. 201020661514.9 can pass through the communication system of transformer, and this system comprises: main website intensive data acquisition control device, is connected with data center of power office; Wide area power line carrier communication WPLC signal downlink modulation treatment device, is connected with above-mentioned main website intensive data acquisition control device by the telecommunication cable that transmits descending collection control signal; Acquisition terminal, is connected with above-mentioned WPLC signal downlink modulation treatment device with the high-voltage power line of transmission WPLC modulation signal by the low-voltage power line that is connected successively, the user transformers that is positioned at above-mentioned acquisition terminal side, and is connected with user terminal.This patented technology makes transmission range farther really, and communication reliability is also improved, but this technical pattern is complicated, and realize difficulty, acquisition terminal and user terminal adopt traditional RS-485 interface to be connected, and antijamming capability is poor.
Summary of the invention
The object of the present invention is to provide that a kind of communication distance is far away, interference rejection ability is strong, structure is simple, meet the power-frequency communication of electric system based on TPLC of China Power Grids kilowatt meter reading-out system requirement.
A kind of power-frequency communication of electric system based on TPLC provided by the invention, under being arranged on each transformer platform area, installs a primary module at concentrator Nodes, installs one respectively from module at each terminal list meter Nodes; Described primary module has check-in signal testing circuit, exit signal modulation circuit and processor, and check-in signal testing circuit is connected with processor, and processor and concentrator this processor simultaneously that communicates is connected with exit signal modulation circuit; Described have check-in signal modulation circuit, exit signal demodulator circuit and processor from module, and exit signal demodulator circuit is connected with processor, and processor and terminal list meter this processor simultaneously that communicates is connected with check-in signal modulation circuit; Concentrator sends exit signal to also detecting the check-in signal sent from module from module by primary module, and terminal list meter passes through to detect the exit signal that primary module sends to primary module from module transmission check-in signal, for realizing low-frequency transmission, and point-to-point communication.
Described primary module connects the every of power line and also has pressure filter circuit, bandwidth-limited circuit, phase detecting circuit mutually, and these circuit connect in turn, and the input of described check-in signal testing circuit is connected in the output of pressure filter circuit.
Described also have pressure filter circuit, phase detecting circuit mutually from the every of model calling power line, and the described input of exit signal demodulator circuit is connected with the output of pressure filter circuit.
Described primary module and from module all with current detection circuit, when detecting that electric current is excessive, processor turns off silicon controlled drive singal immediately.
The exit signal modulation circuit of described primary module comprises three switching tubes, three switch tube driving circuits and an exit signal adjustment inductance; Switching tube is connected between the power line of three-phase voltage system and the neutral line respectively, the control end of switch tube driving circuit connecting valve pipe, switch tube driving circuit produces turning on and off of drive singal control switch pipe, and exit signal adjustment inductance is connected on the neutral line of three-phase voltage system.
The described check-in signal modulation circuit from module comprises two switching tubes, two switch tube driving circuits and a check-in signal modulated resistance; Two paralleled power switches are between power line AC1 and AC2, and the control end of switch tube driving circuit connecting valve pipe, switch tube driving circuit produces turning on and off of drive singal control switch pipe, and check-in signal modulated resistance is connected on power line AC1.
The described phase-angle detection from module and exit signal demodulator circuit comprise a comparator chip, two resistance and two electric capacity; Signal on power line is connected with the inverting input of comparator chip after filtering process through dividing potential drop, the in-phase input end of comparator chip is connected with processor output pin, simultaneously by electric capacity 1 ground connection, the output of comparator chip is connected with power supply by pull-up resistor, be connected to ground by electric capacity, be connected with processor input pin simultaneously, between the in-phase input end of comparator chip and output, also need connection resistance.
Switching tube in the exit signal modulation circuit of described primary module can adopt controllable silicon or IGBT (Insulated Gate Bipolar Transistor insulated gate bipolar transistor), and corresponding switch tube driving circuit can adopt the special driving optocoupler of controllable silicon or IGBT drive circuit; Adopt controllable silicon as switching tube, when adopting the special driving optocoupler of controllable silicon as switch tube driving circuit, 1 pin, 2 pin of the special driving optocoupler of controllable silicon are connected with processor, 4 pin are connected with silicon controlled control end, 4 pin are connected with the neutral line N of three-phase voltage system by resistance, signal adjustment inductance simultaneously, and 6 pin are connected with the phase power line in three-phase voltage system by another resistance.
The exit signal modulation circuit of described primary module also comprises six protective resistances and an insurance; Three protective resistances are connected in parallel on three switching tube two ends respectively; remaining three protective resistances is connected between three switch tube driving circuits and signal adjustment inductance; the high voltage protection circuit of six protective resistance compositions better protective circuit can not be subject to the impact of electrical network surge impact voltage; insurance is connected on the neutral line of three-phase voltage system;, action can cut off circuit rapidly when having shorted devices or switching tube false triggering.
Describedly can adopt controllable silicon or IGBT (Insulated Gate Bipolar Transistor insulated gate bipolar transistor) from the switching tube the check-in signal modulation circuit of module, corresponding switch tube driving circuit adopts the special driving optocoupler of controllable silicon or IGBT drive circuit; Adopt controllable silicon as switching tube, when adopting the special driving optocoupler of controllable silicon as switch tube driving circuit, two controllable silicons are in parallel in the opposite direction, and one end is connected to the input line AC2 from module, and the other end is connected to the input line AC1 from module by check-in signal modulated resistance R1; Signal adjusting resistance R2 is series at the control end of check-in signal modulated resistance R1 and controllable silicon SCR 1; Signal adjusting resistance R4 is series at the control end from module input line AC2 and controllable silicon SCR 2; Signal adjusting resistance R3 is series between the control end of controllable silicon SCR 2 and the pin 6 of controllable silicon special driving optocoupler U1; Be made up of from module controllable silicon drive circuit the special driving optocoupler of controllable silicon; 1 pin, 2 pin of the special driving optocoupler of controllable silicon are connected with processor, 4 pin are connected with the control end of controllable silicon SCR 1,4 pin are connected with the neutral line N of three-phase voltage system with insurance by resistance, signal adjustment inductance simultaneously, and 6 pin are connected with the phase power line in three-phase voltage system by resistance.
The described check-in signal modulation circuit from module also comprises a protective resistance and an insurance; protective resistance is connected in parallel on switching tube two ends; the high voltage protection circuit of protective resistance composition better protective circuit can not be subject to the impact of electrical network surge impact voltage; insurance is connected on power line, action can cut off circuit rapidly when having shorted devices or switching tube false triggering.
Compared with prior art, the present invention adopts the mode modulation signal of voltage modulated, without the need to current transformer, the requirement of China Power Grids kilowatt meter reading-out system can be met, the frequency of the pulse signal of modulation is 200 ~ 700Hz, far below the power carrier signal frequency of routine, be not subject to the impedance influences of power distribution network and produce standing wave, low frequency signal also there will not be decay, and transmission range increases greatly, and in corresponding frequency band, electric network noise energy is little, communication success rate is far above convention carrier, directly can use point-to-point communication, without the need to networking, network topology is simple.
Accompanying drawing explanation
Fig. 1 is present system block diagram.
Fig. 2 is primary module block diagram in embodiment of the present invention.
Fig. 3 is from module frame chart in embodiment of the present invention.
Fig. 4 is primary module exit signal modulation circuit theory diagram in embodiment of the present invention.
Fig. 5 is a kind of specific embodiment circuit theory diagrams of primary module exit signal modulation circuit in embodiment of the present invention.
Fig. 6 is a kind of specific embodiment circuit theory diagrams from the divider filter of module, phase-angle detection and exit signal demodulator circuit in embodiment of the present invention.
Fig. 7 is from module check-in signal modulation circuit theory diagram in embodiment of the present invention.
Fig. 8 is a kind of specific embodiment circuit theory diagrams from module check-in signal modulation circuit in embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 reflects system architecture of the present invention, should install the power-frequency communication of electric system of TPLC under each transformer platform area, and this system comprises concentrator, single-phase meter, three-phase meter, primary module and from module; Primary module is installed on concentrator side, with concentrator by communication interface communication, primary module is all directly connected with power line with concentrator, single-phase electric energy meter or three-phase electric energy meter end is installed on from module, pass through communication interface communication with corresponding single-phase meter or three-phase meter, be all directly connected with power line with three-phase meter from module, single-phase meter.
Fig. 2 shows the annexation of primary module and primary module and concentrator, and primary module comprises pressure filter circuit, bandwidth-limited circuit, phase detecting circuit, check-in signal observation circuit, processor, current detection circuit and exit signal modulation circuit; From the check-in signal that module sends, by being divided into two-way after pressure filter circuit, a road is successively by sending into processor after bandwidth-limited circuit and phase detecting circuit, and another road is directly by sending into the processor of primary module after check-in signal testing circuit; When primary module sends exit signal, processor controls exit signal modulation circuit, is modulated to by exit signal on power line; The current detection circuit of primary module, when detecting that electric current is excessive, processor turns off silicon controlled drive singal immediately, ensures the safety of grid equipment; Processor in primary module is the processor with UART interface, and the UART interface of the UART interface of processor and the processor in concentrator is by light-coupled isolation and be connected.
Fig. 3 reflects from module and the annexation from module and terminal list meter, can find out from module and comprise pressure filter circuit, phase-detection & exit signal demodulator circuit, processor, check-in signal modulation circuit and current detection circuit in figure; From the exit signal that module reception primary module sends, after carrying out dividing potential drop and signal filtering by pressure filter circuit, send into processor by phase-detection & exit signal demodulator circuit; When sending check-in signal from module, processor controls check-in signal modulation circuit, is modulated to by check-in signal on power line; From the current detection circuit of module, when detecting that electric current is excessive, processor turns off silicon controlled drive singal immediately, ensures the safety of grid equipment; From the processor that the processor in module is with UART interface, the UART interface of the processor in the UART interface of processor and table meter is by light-coupled isolation and be connected.
As shown in Fig. 4 ~ Fig. 5, be primary module exit signal modulation circuit theory diagram and a kind of specific embodiment circuit theory diagrams of the embodiment of the present invention; Three switching tubes are connected between power line in three-phase voltage system and zero line respectively, and switch tube driving circuit is connected with the control end of respective switch pipe, turning on and off of control switch pipe, and exit signal adjustment inductance is connected on the zero line of electric power system; Concrete, when switching tube adopts controllable silicon, switch tube driving circuit employing controllable silicon driving chip, circuit theory diagrams are as shown in Figure 5: controllable silicon drive circuit is made up of controllable silicon special driving opto-coupler chip U4, U5 and U6,1 pin of the special driving opto-coupler chip of controllable silicon is connected by current-limiting resistance with the pin of processor with 2 pin, 4 pin are connected with controllable silicon SCR 4, SCR5 or SCR6, simultaneously pin 4 adjust inductance L 1 by resistance R15, R17 or R19 with exit signal and is connected, and L1 passes through to insure F2 and is connected with the neutral line N of three-phase electrical power system; 6 pin of the special driving opto-coupler chip of controllable silicon are connected by the A phase line of resistance R14, R16 or R18 and three-phase electrical power system, B phase line or C phase line; Controllable silicon SCR 4, SCR5 and SCR6 are parallel to the A phase line of three-phase power wire system, B phase line or C phase line and exit signal adjusts between inductance L 1; Protective resistance RV4, RV5 and RV6 are in parallel with controllable silicon SCR 4, SCR5 and SCR6 respectively, and one end of protective resistance RV7, RV8 and RV9 is connected to 6 pin of controllable silicon special driving optocoupler U4, U5 and U6, and the other end all adjusts inductance L 1 with signal and is connected.Module, the structural requirement exit signal of exit signal demodulator circuit has stronger signal amplitude, and therefore exit signal uses inductance to modulate, its induction reactance R
l=| j ω L+r| is determined value in circuit, and the angle being opened silicon controlled moment distance zero crossing by adjustment ensures that the intensity of modulation signal remains stable.
Fig. 6 is from module divider filter in embodiment of the present invention, phase-angle detection and exit signal demodulator circuit schematic diagram; The potential-divider network be made up of resistance R5, R6, R7 and R8 from module bleeder circuit forms, and 220V network voltage is down to the low-voltage of about 5V by potential-divider network.From the second-order low-pass filter composition of module filtered electricity routing resistance R9 and R10, electric capacity C1 and C2 and amplifier OP1 composition, filter circuit can filtering high frequency spurs and noise, improves the signal to noise ratio of signal.From module phase-angle detection and exit signal demodulator circuit by resistance R11 and R12, electric capacity C3 and C4 forms, the inverting input of the signal input comparator COMP1 after divider filter, the voltage signal VDAC of processor output rule change, after ground capacity C3 filtering, connect the in-phase input end of comparator COMP1, voltage signal VDAC is connected with the output pin of comparator COMP1 by resistance R11 simultaneously, the output pin of comparator COMP1 is connected to ground through electric capacity C4 and outputs signal OUT_INT, output signal OUT_INT is connected with power supply DVDD through pull-up resistor R12, and be connected with the input pin of processor simultaneously, processor can detect whether have exit signal and phase angle information by the pulse train of the output OUT_INT of comparator.
Fig. 7 ~ Fig. 8 be in embodiment of the present invention from module check-in signal modulation circuit theory diagram and a kind of specific embodiment circuit theory diagrams; Two switching tubes are all connected in parallel between power line AC1 and power line AC2, and switch tube driving circuit is connected with the control end of respective switch pipe, turning on and off of control switch pipe, and check-in signal modulated resistance is connected on power line AC1; Concrete, when switching tube adopts controllable silicon, switch tube driving circuit to adopt controllable silicon driving chip, circuit theory diagrams as shown in Figure 8: controllable silicon drive circuit is made up of controllable silicon special driving opto-coupler chip U1; 1 pin of controllable silicon special driving chip is connected by current-limiting resistance with the pin of processor with 2 pin; 4 pin are connected with the control end of controllable silicon SCR 1; 4 pin are connected with power line AC1 with insurance F1 by resistance R2, check-in signal modulated resistance R1 simultaneously; 6 pin are connected with the control end of controllable silicon SCR 2 by resistance R3; the control end of controllable silicon SCR 2 is connected with power line AC2 by resistance R4; controllable silicon SCR 1 and SCR2 parallel connected in reverse phase are between power line AC2 and the connecting line of resistance R1 and R2, and protective resistance RV1 is in parallel with controllable silicon SCR 1 and SCR2.Processor is by the pulse current opening a moment of generation of control SCR1 and SCR2, and the mode making line voltage produce faint distortion modulates a signal loading on power line.Adjusted the intensity of signal by the size of control impuls electric current, electric current is larger, then the voltage distortion amplitude produced is larger; Getting line voltage, is angular frequency, is fixed value, can obtain the computing formula of pulse current:, therefore i is U
m, these 3 parameters of t and R1 determine; R1 is fixed value in circuit, actual electric network U
mbe fluctuation, therefore processor can according to U
mthe adjustment parametric t of change tread, change the angle opening silicon controlled time gap zero crossing, thus ensure that the intensity of modulation signal remains stable.
Claims (11)
1. based on a power-frequency communication of electric system of TPLC, under it is characterized in that this system is arranged on each transformer platform area, at concentrator Nodes, a primary module is installed, installs one respectively from module at each terminal list meter Nodes; Described primary module has check-in signal testing circuit, exit signal modulation circuit and processor, and check-in signal testing circuit is connected with processor, and processor and concentrator this processor simultaneously that communicates is connected with exit signal modulation circuit; Described have check-in signal modulation circuit, exit signal demodulator circuit and processor from module, and exit signal demodulator circuit is connected with processor, and processor and terminal list meter this processor simultaneously that communicates is connected with check-in signal modulation circuit; Concentrator sends exit signal to also detecting the check-in signal sent from module from module by primary module, and terminal list meter passes through to detect the exit signal that primary module sends to primary module from module transmission check-in signal, for realizing low-frequency transmission, and point-to-point communication.
2. the power-frequency communication of electric system based on TPLC according to claim 1, it is characterized in that described primary module connects the every of power line and also has pressure filter circuit, bandwidth-limited circuit, phase detecting circuit mutually, these circuit connect in turn, and the input of described check-in signal testing circuit is connected in the output of pressure filter circuit.
3. the power-frequency communication of electric system based on TPLC according to claim 1, also have pressure filter circuit, phase detecting circuit mutually from the every of model calling power line described in it is characterized in that, the described input of exit signal demodulator circuit is connected with the output of pressure filter circuit.
4. the power-frequency communication of electric system based on TPLC according to claim 1, it is characterized in that described primary module and from module all with current detection circuit, when detecting that electric current is excessive, processor turns off silicon controlled drive singal immediately.
5., according to the power-frequency communication of electric system based on TPLC one of claim 1,2,4 Suo Shu, it is characterized in that the exit signal modulation circuit of described primary module comprises three switching tubes, three switch tube driving circuits and an exit signal adjustment inductance; Switching tube is connected between the power line of three-phase voltage system and the neutral line respectively, the control end of switch tube driving circuit connecting valve pipe, switch tube driving circuit produces turning on and off of drive singal control switch pipe, and exit signal adjustment inductance is connected on the neutral line of three-phase voltage system.
6., according to the power-frequency communication of electric system based on TPLC one of claim 1,3,4 Suo Shu, described in it is characterized in that, comprise two switching tubes, two switch tube driving circuits and a check-in signal modulated resistance from the check-in signal modulation circuit of module; Two paralleled power switches are between power line AC1 and AC2, and the control end of switch tube driving circuit connecting valve pipe, switch tube driving circuit produces turning on and off of drive singal control switch pipe, and check-in signal modulated resistance is connected on power line AC1.
7. the power-frequency communication of electric system based on TPLC according to claim 3, is characterized in that the described phase-angle detection from module and exit signal demodulator circuit comprise a comparator chip, two resistance and two electric capacity; Signal on power line is connected with the inverting input of comparator chip after filtering process through dividing potential drop, the in-phase input end of comparator chip is connected with processor output pin, simultaneously by electric capacity 1 ground connection, the output of comparator chip is connected with power supply by pull-up resistor, be connected to ground by electric capacity, be connected with processor input pin simultaneously, between the in-phase input end of comparator chip and output, also need connection resistance.
8. the power-frequency communication of electric system based on TPLC according to claim 5, it is characterized in that described switching tube can adopt controllable silicon or IGBT (Insulated Gate Bipolar Transistor insulated gate bipolar transistor), corresponding switch tube driving circuit adopts the special driving optocoupler of controllable silicon or IGBT drive circuit; Adopt controllable silicon as switching tube, when adopting the special driving optocoupler of controllable silicon as switch tube driving circuit, 1 pin, 2 pin of the special driving optocoupler of controllable silicon are connected with processor, 4 pin are connected with silicon controlled control end, 4 pin are connected with the neutral line N of three-phase voltage system by resistance, signal adjustment inductance simultaneously, and 6 pin are connected with the phase power line in three-phase voltage system by another resistance.
9. the power-frequency communication of electric system based on TPLC according to claim 5, is characterized in that the exit signal modulation circuit of described primary module also comprises six protective resistances and an insurance; Three protective resistances are connected in parallel on three switching tube two ends respectively; remaining three protective resistances is connected between three switch tube driving circuits and signal adjustment inductance; the high voltage protection circuit of six protective resistance compositions better protective circuit can not be subject to the impact of electrical network surge impact voltage; insurance is connected on the electric power system neutral line, action can cut off circuit rapidly when having shorted devices or switching tube false triggering.
10. the power-frequency communication of electric system based on TPLC according to claim 6, it is characterized in that described switching tube can adopt controllable silicon or IGBT (Insulated Gate Bipolar Transistor insulated gate bipolar transistor), corresponding switch tube driving circuit adopts the special driving optocoupler of controllable silicon or IGBT drive circuit; Adopt controllable silicon as switching tube, when adopting the special driving optocoupler of controllable silicon as switch tube driving circuit, two controllable silicons are in parallel in the opposite direction, and one end is connected to the input line AC2 from module, and the other end is connected to the input line AC1 from module by check-in signal modulated resistance R1; Signal adjusting resistance R2 is series at the control end of check-in signal modulated resistance R1 and controllable silicon SCR 1; Signal adjusting resistance R4 is series at the control end from module input line AC2 and controllable silicon SCR 2; Signal adjusting resistance R3 is series between the control end of controllable silicon SCR 2 and the pin 6 of controllable silicon special driving optocoupler U1; Be made up of from module controllable silicon drive circuit the special driving optocoupler of controllable silicon; 1 pin, 2 pin of the special driving optocoupler of controllable silicon are connected with processor, 4 pin are connected with the control end of controllable silicon SCR 1,4 pin are connected with the neutral line N of three-phase voltage system with insurance by resistance, signal adjustment inductance simultaneously, and 6 pin are connected with the phase power line in three-phase voltage system by resistance.
The 11. power-frequency communication of electric systems based on TPLC according to claim 6; a protective resistance and an insurance is also comprised from the check-in signal modulation circuit of module described in it is characterized in that; protective resistance is connected in parallel on switching tube two ends; the high voltage protection circuit of protective resistance composition better protective circuit can not be subject to the impact of electrical network surge impact voltage; insurance is connected on power line, action can cut off circuit rapidly when having shorted devices or switching tube false triggering.
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| CN105931447A (en) * | 2016-07-04 | 2016-09-07 | 贵州电网有限责任公司电力科学研究院 | Downlink communication system of low-voltage power meter reading system and meter reading method |
| CN106230482A (en) * | 2016-08-26 | 2016-12-14 | 北京艾普智城网络科技有限公司 | Power-line carrier communication method and system |
| CN106230482B (en) * | 2016-08-26 | 2019-08-09 | 北京艾普智城网络科技有限公司 | Power-line carrier communication method and system |
| CN106772499A (en) * | 2016-11-16 | 2017-05-31 | 湖南华烨智能通信技术股份有限公司 | A kind of method and system of automatic acquisition platform area topological diagram |
| CN111371475A (en) * | 2020-02-27 | 2020-07-03 | 威胜电气有限公司 | TPLC-based power distribution station area file management system and method |
| CN111198516A (en) * | 2020-02-28 | 2020-05-26 | 上海良信电器股份有限公司 | Circuit breaker, topological characteristic signal generation system, method and device |
| WO2021189774A1 (en) * | 2020-03-27 | 2021-09-30 | 威胜信息技术股份有限公司 | Method and system for extracting characteristic signal from power frequency signal, and archive management method |
| US11852661B2 (en) | 2020-03-27 | 2023-12-26 | Willfar Information Technology Co., Ltd. | Method and system for extracting characteristic signal from power frequency signal and file management method therefor |
| CN111900957A (en) * | 2020-07-20 | 2020-11-06 | 广州斯全德灯光有限公司 | Stable heat dissipation solid state relay for dimming module and manufacturing method thereof |
| CN113708774A (en) * | 2021-09-13 | 2021-11-26 | 国网湖北省电力有限公司恩施供电公司 | Device and method for generating TWACS waveform |
| CN113708774B (en) * | 2021-09-13 | 2023-07-25 | 国网湖北省电力有限公司恩施供电公司 | Device and method for generating TWACS waveform |
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