CN203554436U - Conducted interference isolation circuit for low-voltage circuit line carrier communication - Google Patents
Conducted interference isolation circuit for low-voltage circuit line carrier communication Download PDFInfo
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- CN203554436U CN203554436U CN201320477239.9U CN201320477239U CN203554436U CN 203554436 U CN203554436 U CN 203554436U CN 201320477239 U CN201320477239 U CN 201320477239U CN 203554436 U CN203554436 U CN 203554436U
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Abstract
The utility model provides a conducted interference isolation circuit for low-voltage circuit line carrier communication. The conducted interference isolation circuit comprises a first isolation circuit, a second isolation circuit, and a third isolation circuit, wherein the first isolation circuit comprises a circuit breaker, a first isolation transformer used for isolating a high-frequency noise and a pulse noise, a first linear impedance stabilization network used for suppressing the co-frequency interference of the tested frequency bands, an electricity leakage protector and an air switch which are sequentially connected; the second isolation circuit comprises a second isolation transformer, a first EMI (electro-magnetic interference) filter used for filtering out a power supply noise, and an inductive magnetic ring used for suppressing a space coupling noise and a test instrument conducting noise which are sequentially connected; the third isolation circuit comprises a third isolation transformer, a second EMI filter, and a second linear impedance stabilization network connected with a tested transmitter which are sequentially arranged at the tested transmitter end, as well as a fourth isolation transformer, a third EMI filter, and a third linear impedance stabilization network connected with a tested receiver which are sequentially arranged at the tested receiver end.
Description
Technical field
The utility model relates to communication system, particularly, relates to a kind of conducted interference buffer circuit for low-voltage circuit line carrier communication.
Background technology
Along with the extensive use of voltage power-line carrier communication technology, the communication performance detection technique accompanying with it has also obtained development fast.Because low-voltage powerline carrier communication has been used the medium of low pressure adapted electric network as communication, on signal characteristic and channel circumstance, there is larger difference with other communication modes, therefore corresponding communication check technology is also had higher requirement.For radio communication detection technique and traditional special line communication detection technique, in the testing process of low-voltage powerline carrier communication, need more to note the problem of the aspects such as isolated from power, signal cross-talk, loss and channel circumstance simulation.
In the build process of low-voltage powerline carrier communication testing environment, the inhibition of conductibility electromagnetic interference is wherein very important aspect.Good conductive interference suppression ability can prevent that outside noise from disturbing, and for testing equipment and tested product provide clean operational environment, is to detect the accurate believable basis of result of the test.
Due in the testing process of low-voltage powerline carrier communication, low-voltage power line is supply line, it is again communication media, the power supply of testing equipment and tested communication products all relies on low-voltage power line power supply, and the carrier communication signal that tested communication products are received and dispatched is also using low-voltage power line as communication channel, extraneous noise jamming and tested carrier signal are easy to be transmitted to receiving terminal along power circuit, and this shielding for electromagnetic interference has proposed challenge.
The application of copying product along with development and the carrier wave collection of PLC technology, the external main scientific research institution corresponding carrier telecommunication detection technique that also begins one's study.But current detection system is not carried out complete Power Management Design, only utilize the equipment such as isolating transformer and linear impedance stabilization network to external world noise carried out simple isolation, noise effect isolation effect is limited to external world.
That is to say, low tension route in carrier telecommunication detection technique is due to its ins and outs at present, caused noise problem, the noise of how to isolate the generation of low tension route is the problem that urgently needs solution in carrier telecommunication detection technique.
Utility model content
The main purpose of the utility model embodiment is to provide a kind of conducted interference buffer circuit for low-voltage circuit line carrier communication, to solve the existing carrier telecommunication detection technique problem of noise isolation effectively.
To achieve these goals, the utility model embodiment provides a kind of conducted interference buffer circuit for low-voltage circuit line carrier communication, described conducted interference buffer circuit comprises: the first buffer circuit, the second buffer circuit and the 3rd buffer circuit, wherein, described the first buffer circuit is arranged between extraneous supply network and communication system, described the second buffer circuit is arranged between described communication system and testing equipment, described the 3rd buffer circuit is arranged in the communication channel between tested transmitter and the tested receiver of described testing equipment, described the first buffer circuit, comprise: the circuit breaker connecting successively, for isolating the first isolating transformer of high-frequency noise and impulsive noise, for suppressing to test the first linear impedance stabilization network of frequency range co-channel interference, earth leakage protective device and air switch, described the second buffer circuit, comprise: the second isolating transformer connecting successively, for the first electromagnetic interface filter of filter out power noise, and for suppressing the perceptual magnet ring of Space Coupling noise and tester conducted noise, described the 3rd buffer circuit, comprise: the 3rd isolating transformer that is successively set on described tested transmitter terminal, the second electromagnetic interface filter, the second linear impedance stabilization network being connected with described tested transmitter, and be successively set on the 4th isolating transformer of described tested receiver end, the 3rd electromagnetic interface filter, the 3rd linear impedance stabilization network being connected with described tested receiver, or, be successively set on described tested receiver end for AC power frequency supply being converted to DC power supply AC-DC transducer, for DC power supply being converted back to the DC-AC inverter of AC power, and the 4th linear impedance stabilization network being connected with described tested receiver.
Described the 3rd buffer circuit also comprises: decoupling zero unit, connects between described tested transmitter and described the second linear impedance stabilization network, for filtering power frequency supply signal; PLC channel simulator, is connected with described decoupling zero unit, for analog channel; Coupler, is connected with described PLC channel simulator and the current supply circuit of described tested receiving terminal.
Described the first electromagnetic interface filter comprises:
Differential mode suppresses capacitor C l and differential mode suppresses capacitor C 2, and Cl, C2 are connected between L line and N line,
Common mode inhibition capacitor C 3 and common mode inhibition capacitor C 4, C3 is connected between L line and GND, and C4 is connected between N line and GND,
Common mode inductance L1 and common mode inductance L2, L1 is connected in L line, and L2 is connected in N line.
Described the first isolating transformer, the second isolating transformer, the 3rd isolating transformer, the 4th isolating transformer are identical isolating transformer.
Described the first linear impedance stabilization network, the second linear impedance stabilization network, the 3rd linear impedance stabilization network, the 4th linear impedance stabilization network are identical linear impedance stabilization network.
Described the first electromagnetic interface filter, the second electromagnetic interface filter, the 3rd electromagnetic interface filter are identical electromagnetic interface filter.
By means of technique scheme, by three layers of buffer circuit noise isolation effectively, thus the proper communication of the signal of remaining valid.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is according to the structured flowchart of the conducted interference buffer circuit of the utility model embodiment;
Fig. 2 is the structural representation of the first buffer circuit;
Fig. 3 is the structural representation of the second buffer circuit;
Fig. 4 is the circuit diagram of electromagnetic interface filter;
Fig. 5 is the structural representation of the buffer circuit of the current supply circuit method of purification;
Fig. 6 is the structural representation of the buffer circuit of renewable power supply method;
Fig. 7 is the performance test curve chart of buffer circuit;
Fig. 8 is by the channel ground noise intensity curve schematic diagram after three buffer circuits.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides a kind of conducted interference buffer circuit for low-voltage circuit line carrier communication, as shown in Figure 1, this conducted interference buffer circuit comprises: the first buffer circuit 1, the second buffer circuit 2 and the 3rd buffer circuit 3, wherein, the first buffer circuit 1 is arranged between extraneous supply network and communication system, the second buffer circuit 2 is arranged between communication system and testing equipment, and the 3rd buffer circuit 3 is arranged in the communication channel between tested transmitter and the tested receiver of testing equipment.
The first buffer circuit 1, comprising: the circuit breaker that connects successively, for isolating the first isolating transformer of high-frequency noise and impulsive noise, for suppressing to test the first linear impedance stabilization network, earth leakage protective device and the air switch of frequency range co-channel interference,
The second buffer circuit 2, comprising: successively connect the second isolating transformer, for the first electromagnetic interface filter of filter out power noise and for suppressing the perceptual magnet ring of Space Coupling noise and tester conducted noise,
The 3rd buffer circuit 3, comprising: be successively set on the 3rd isolating transformer, the second electromagnetic interface filter of tested transmitter terminal, the second linear impedance stabilization network being connected with tested transmitter; And
Be successively set on the 4th isolating transformer, the 3rd electromagnetic interface filter of tested receiver end, the 3rd linear impedance stabilization network being connected with tested receiver, or, be successively set on tested receiver end for AC power frequency supply being converted to DC power supply AC-DC transducer, the 4th linear impedance stabilization network for DC power supply being converted back to the DC-AC inverter of AC power and being connected with tested receiver.
As seen from the above description, by three layers of buffer circuit noise isolation effectively, thus the proper communication of the signal of remaining valid.
In the specific implementation, the 3rd buffer circuit 3 also comprises:
Decoupling zero unit, connects between tested transmitter and the second linear impedance stabilization network, for filtering power frequency supply signal;
PLC channel simulator, is connected with decoupling zero unit, for analog channel;
Coupler, is connected with the current supply circuit of PLC channel simulator and tested receiving terminal.
In order better to understand the utility model embodiment, below describe respectively above-mentioned three buffer circuits in detail.
(1) first buffer circuit 1
This buffer circuit is mainly used in the isolation of test environment and extraneous supply network, in order to prevent various noise jamming and the impact of impedance variation on test environment (Testing Power) on extraneous low-voltage power line, need between test environment and extraneous supply network, carry out isolation design, eliminate the conduction coupling influence of various unfavorable signals, to power path, carry out separate with communication channel, signal of communication is introduced to controlled special test channel, will offer tester through the power frequency supply purifying.This buffer circuit comprises high-frequency noise purification, impedance stabilization and security protection three parts altogether.
Fig. 2 is the structural representation of this buffer circuit; as shown in Figure 2; this buffer circuit comprises: the circuit breaker (Breaker) being connected with externally fed network (External Power Supplier); and isolating transformer (the Isolating Transformer connecting successively; IF), linear impedance stabilization network (LISN), earth leakage protective device (RCD) and air switch (Air Switch, AS).Wherein:
Isolating transformer (IF) plays with linear impedance stabilization network (LISN) effect that noise purifies jointly, can play good inhibitory action to the co-channel interference of high-frequency noise, impulsive noise and test frequency range.Take the communications band of 100kHz～500kHz as example, its signal suppressing ability is greater than 80dB.Linear impedance stabilization network (LISN) can also play the effect of steady testing environment impedance operator, the impedance characteristic of test frequency range can be stabilized in to 50ohm left and right, improves the coupling efficiency of signal, prevents the caused signal attenuation of impedance variation.
Isolating transformer (IF) has formed safety protective mechanisms jointly with circuit breaker, earth leakage protective device (RCD), air switch (AS), plays the protective effect to potential safety hazards such as thunderbolt, overvoltage, overcurrent, Leaked Current of Line to Ground.
(2) second buffer circuits 2
This buffer circuit is the isolation of testing equipment power supply and communication loop, in order to guarantee communication test precision, the power supply of testing equipment should be pure power frequency supply, and can not be polluted by carrier communication signal, therefore needs to design complete high-frequency signal braking measure.
Fig. 3 is the structural representation of this buffer circuit, and as shown in Figure 3, this buffer circuit comprises: the isolating transformer being connected with test macro and the electromagnetic interface filter, the perceptual magnet ring that connect successively.Wherein, isolating transformer, as elementary spacer assembly, can play obvious inhibitory action to high-frequency signal and impulse disturbances; Electromagnetic interface filter is realized the filtering to mains side noise, for noise jamming more than 10kHz, has very strong filter action; Also at the supply terminals of instrument and equipment, install perceptual magnet ring (Inductance Core) additional in addition, realize the inhibition to Space Coupling harassing and wrecking, and prevent that the conduction interference that tester produces from affecting measuring accuracy.
Fig. 4 is the circuit diagram of this electromagnetic interface filter, and as shown in Figure 4, this electromagnetic interface filter comprises: it is Cl and C2 that differential mode suppresses electric capacity, and common mode inhibition electric capacity is C3 and C4, and common mode inductance is L1 and L2.It is inhibited that common mode inductance presents large inductance for common-mode signal, and present very little leakage inductance for difference mode signal, works hardly.Because interference signal has two kinds of differential mode and common modes, therefore filter will all have attenuation to these two kinds of interference.
This electromagnetic interface filter basic principle is:
(1) utilize the characteristic of the logical high frequency of electric capacity every low frequency, by positive source, power cathode hf interference current imports ground wire (common mode), or positive source hf interference current is imported to power cathode (differential mode).
(2) utilize the impedance operator of inductance coil, hf interference current is reflected back to interference source.
(3) the 3rd buffer circuits 3
This buffer circuit is mainly used in the isolation of communication channel between tested transmitter and tested receiver, due to the ins and outs of voltage power-line carrier communication technology, signal of communication can be propagated by current supply circuit between tested transmitting terminal and receiving terminal, affects test accuracy.In order to address this problem, need on the current supply circuit between tested transmitter and tested receiver, carry out the isolation of carrier signal.According to the difference of isolation technology, can be divided into two kinds of modes of the current supply circuit method of purification and renewable power supply method.
The current supply circuit method of purification and renewable power supply method are below described respectively.
The buffer circuit of the current supply circuit method of purification as shown in Figure 5, this buffer circuit comprises: the current supply circuit of transmitter and receiver is applied respectively one group of isolating transformer, electromagnetic interface filter and LISN, for the test frequency range of 10kHz～10MHz, filter effect is better than 100dB, can realize the effective filtering to carrier communication in-band signal.If the leakage signal of transmitter need to be passed through the isolation of two groups of filter networks, make its signal strength signal intensity in receiver one side be significantly less than receiving sensitivity, cannot be correctly validated.With this understanding, the carrier signal intelligence that transmitter sends is by decoupling zero unit, and filtering power frequency supply signal, is transferred in test low-voltage power line communication channel analogue means used, by coupler, be transferred on the current supply circuit of receiving terminal again, realize the test to communication performance.
The buffer circuit of renewable power supply method as shown in Figure 6, in transmitter one side, identical with the layout of the current supply circuit method of purification, and in receiver one side, use AC-DC transducer that AC power frequency supply is converted to DC power supply, then converted it back to Alternating Current Power Supply with DC-AC inverter.In AC-DC-AC transfer process, need to utilize frequency/phase synchronizer to realize the synchronous of frequency to AC power and phase place, synchronization accuracy should be better than 50uS, to guarantee the using communication products of the phase place zero passage communication technology normally to work.This mode relies on receiver one side and arranges a set of AC-DC-AC power supply, and power frequency power supply is become to direct current supply, then converts back Alternating Current Power Supply, thereby realizes the complete filtering to all interference signals of power supply input side.
Than the current supply circuit method of purification, renewable power supply method is by becoming AC signal the mode of direct current signal, can reach better isolation effect, but inverter cost is very high, and inverter itself also can be introduced very strong humorous wave interference, to test accuracy, also can exert an adverse impact, be applicable to the exigent occasion of isolation effect.
In practical operation, the isolating transformer in above-mentioned three buffer circuits can be identical isolating transformer, and linear impedance stabilization network is identical linear impedance stabilization network, and electromagnetic interface filter is identical electromagnetic interface filter.
Below provide the test performance effect of the conducted interference buffer circuit of the utility model embodiment.
Performance to above-mentioned three part buffer circuits is tested, and test band limits is chosen low pressure arrowband power line carrier communication frequency range, 9kHz～500kHz.Using AWG (Arbitrary Waveform Generator) as signal transmitter, transmit signal power is 20mW.At receiving terminal with spectrum analyzer observation signal attenuation.Specifically isolation effect as shown in Figure 7: what curve 1 showed is the high frequency signal attenuation situation from externally fed network to testing power supply loop after the test environment shown in employing Fig. 2 and extraneous supply network buffer circuit.Curve 2 shows is to adopt the high frequency signal attenuation situation from testing power supply loop to equipment power supply after the buffer circuit of testing equipment power supply as shown in Figure 3 and communication loop.Curve 3 shows is to adopt between transmitter as shown in Figure 5 and receiver the high frequency signal attenuation situation from transmitter one side to receiver one side after communication channel buffer circuit.
Fig. 8 is by the channel ground noise intensity curve schematic diagram after above-mentioned three buffer circuits, as shown in Figure 8, and the ground noise intensity of curve 1 for obtaining from externally fed network measure; Curve 2 shows the ground noise intensity measuring from testing power supply loop after the test environment shown in employing Fig. 2 and extraneous supply network buffer circuit; Curve 3 shows the ground noise intensity measuring from equipment power supply part after the buffer circuit that adopts the power supply of testing equipment as shown in Figure 3 and communication loop; Curve 4 shows and adopts the ground noise intensity measuring from receiver one side after communication channel buffer circuit between transmitter as shown in Figure 5 and receiver.
From test result, after the isolation of above-mentioned three aspects, the interference of low voltage power line carrier signal frequency range can effectively be decayed, the line condition of one " totally " can be provided for testing equipment and tested communication products, eliminate the impact that the conduction of unfavorable signal is coupled on communication test.
In sum, the conducted interference buffer circuit design of the utility model embodiment, prove by experiment, this scheme is better than 80dB for the conducted interference isolation effect in low-voltage power line narrowband carrier communication frequency range, the proper communication of the signal of can remaining valid simultaneously.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; and be not used in limit protection range of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. for a conducted interference buffer circuit for low-voltage circuit line carrier communication, it is characterized in that, described conducted interference buffer circuit comprises:
The first buffer circuit, the second buffer circuit and the 3rd buffer circuit,
Wherein, described the first buffer circuit is arranged between extraneous supply network and communication system, described the second buffer circuit is arranged between described communication system and testing equipment, and described the 3rd buffer circuit is arranged in the communication channel between tested transmitter and the tested receiver of described testing equipment
Described the first buffer circuit, comprising: the circuit breaker that connects successively, for isolating the first isolating transformer of high-frequency noise and impulsive noise, for suppressing to test the first linear impedance stabilization network, earth leakage protective device and the air switch of frequency range co-channel interference,
Described the second buffer circuit, comprising: successively connect the second isolating transformer, for the first electromagnetic interface filter of filter out power noise and for suppressing the perceptual magnet ring of Space Coupling noise and tester conducted noise,
Described the 3rd buffer circuit, comprise: the 3rd isolating transformer that is successively set on described tested transmitter terminal, the second electromagnetic interface filter, the second linear impedance stabilization network being connected with described tested transmitter, and be successively set on the 4th isolating transformer of described tested receiver end, the 3rd electromagnetic interface filter, the 3rd linear impedance stabilization network being connected with described tested receiver, or, be successively set on described tested receiver end for AC power frequency supply being converted to DC power supply AC-DC transducer, for DC power supply being converted back to the DC-AC inverter of AC power, and the 4th linear impedance stabilization network being connected with described tested receiver.
2. conducted interference buffer circuit according to claim 1, is characterized in that, described the 3rd buffer circuit also comprises:
Decoupling zero unit, connects between described tested transmitter and described the second linear impedance stabilization network, for filtering power frequency supply signal;
PLC channel simulator, is connected with described decoupling zero unit, for analog channel;
Coupler, is connected with described PLC channel simulator and the current supply circuit of described tested receiving terminal.
3. conducted interference buffer circuit according to claim 1, is characterized in that, described the first electromagnetic interface filter comprises:
Differential mode suppresses capacitor C l and differential mode suppresses capacitor C 2, and Cl, C2 are connected between L line and N line,
Common mode inhibition capacitor C 3 and common mode inhibition capacitor C 4, C3 is connected between L line and GND, and C4 is connected between N line and GND,
Common mode inductance L1 and common mode inductance L2, L1 is connected in L line, and L2 is connected in N line.
4. conducted interference buffer circuit according to claim 1, is characterized in that, described the first isolating transformer, the second isolating transformer, the 3rd isolating transformer, the 4th isolating transformer are identical isolating transformer.
5. conducted interference buffer circuit according to claim 1, it is characterized in that, described the first linear impedance stabilization network, the second linear impedance stabilization network, the 3rd linear impedance stabilization network, the 4th linear impedance stabilization network are identical linear impedance stabilization network.
6. conducted interference buffer circuit according to claim 1, is characterized in that, described the first electromagnetic interface filter, the second electromagnetic interface filter, the 3rd electromagnetic interface filter are identical electromagnetic interface filter.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104333400A (en) * | 2014-10-30 | 2015-02-04 | 国家电网公司 | System for testing impact of low-voltage power line carrier communication on electric leakage protector |
| CN105049085A (en) * | 2015-08-20 | 2015-11-11 | 深圳市拉格朗日电子有限公司 | Power line communication system |
| CN106338628A (en) * | 2016-11-16 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Protection device for power-frequency interference of broadband microwave access |
| CN106788592A (en) * | 2016-11-24 | 2017-05-31 | 深圳市共进电子股份有限公司 | A kind of Power signal processing device |
| CN106849998A (en) * | 2017-03-10 | 2017-06-13 | 北京盛大信通科技有限公司 | Common mode disturbances restraining device |
| CN109845396A (en) * | 2016-08-12 | 2019-06-04 | 伊利诺斯工具制品有限公司 | Induction heating electric supply, data gathering system and the induction heating system communicated on induction heating cable |
| CN110967578A (en) * | 2019-11-05 | 2020-04-07 | 天津绎迈科技有限公司 | Safe artificial power network circuit structure for electromagnetic compatibility pretesting |
| CN112511242A (en) * | 2020-11-13 | 2021-03-16 | 广西电网有限责任公司南宁供电局 | Carrier detection method and system based on passive isolation |
| CN112564736A (en) * | 2020-12-02 | 2021-03-26 | 成都立鑫新技术科技有限公司 | Dynamic blocking device and method for monitoring carrier communication of scrambling code injection type power line |
| CN113890565A (en) * | 2021-09-29 | 2022-01-04 | 贵州电网有限责任公司 | Anti-interference device based on low-voltage power line carrier |
| CN113964832A (en) * | 2021-11-01 | 2022-01-21 | 青岛鼎信通讯股份有限公司 | Topology for reducing influence of power quality equipment on carrier meter reading |
| CN115085768A (en) * | 2022-08-24 | 2022-09-20 | 广东金朋科技有限公司 | Power line noise separation isolation frame |
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- 2013-08-06 CN CN201320477239.9U patent/CN203554436U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104333400A (en) * | 2014-10-30 | 2015-02-04 | 国家电网公司 | System for testing impact of low-voltage power line carrier communication on electric leakage protector |
| CN105049085A (en) * | 2015-08-20 | 2015-11-11 | 深圳市拉格朗日电子有限公司 | Power line communication system |
| US11277885B2 (en) | 2016-08-12 | 2022-03-15 | Illinois Tool Works Inc. | Induction heating power supplies, data collection systems, and induction heating systems to communicate over an induction heating cable |
| CN109845396A (en) * | 2016-08-12 | 2019-06-04 | 伊利诺斯工具制品有限公司 | Induction heating electric supply, data gathering system and the induction heating system communicated on induction heating cable |
| CN106338628A (en) * | 2016-11-16 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Protection device for power-frequency interference of broadband microwave access |
| CN106338628B (en) * | 2016-11-16 | 2019-03-01 | 中国电子科技集团公司第四十一研究所 | A kind of protective device of wide-band microwave access Hz noise |
| CN106788592A (en) * | 2016-11-24 | 2017-05-31 | 深圳市共进电子股份有限公司 | A kind of Power signal processing device |
| CN106788592B (en) * | 2016-11-24 | 2019-11-08 | 深圳市共进电子股份有限公司 | A kind of Power signal processing device |
| CN106849998A (en) * | 2017-03-10 | 2017-06-13 | 北京盛大信通科技有限公司 | Common mode disturbances restraining device |
| CN110967578A (en) * | 2019-11-05 | 2020-04-07 | 天津绎迈科技有限公司 | Safe artificial power network circuit structure for electromagnetic compatibility pretesting |
| CN112511242A (en) * | 2020-11-13 | 2021-03-16 | 广西电网有限责任公司南宁供电局 | Carrier detection method and system based on passive isolation |
| CN112564736A (en) * | 2020-12-02 | 2021-03-26 | 成都立鑫新技术科技有限公司 | Dynamic blocking device and method for monitoring carrier communication of scrambling code injection type power line |
| CN112564736B (en) * | 2020-12-02 | 2022-10-18 | 成都立鑫新技术科技有限公司 | Dynamic blocking device and method for monitoring carrier communication of scrambling code injection type power line |
| CN113890565A (en) * | 2021-09-29 | 2022-01-04 | 贵州电网有限责任公司 | Anti-interference device based on low-voltage power line carrier |
| CN113890565B (en) * | 2021-09-29 | 2023-09-15 | 贵州电网有限责任公司 | Anti-interference device based on low-voltage power carrier |
| CN113964832A (en) * | 2021-11-01 | 2022-01-21 | 青岛鼎信通讯股份有限公司 | Topology for reducing influence of power quality equipment on carrier meter reading |
| CN115085768A (en) * | 2022-08-24 | 2022-09-20 | 广东金朋科技有限公司 | Power line noise separation isolation frame |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 |