CN107592138A - A kind of power line Adaptive impedance matching method - Google Patents
A kind of power line Adaptive impedance matching method Download PDFInfo
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- CN107592138A CN107592138A CN201710882634.8A CN201710882634A CN107592138A CN 107592138 A CN107592138 A CN 107592138A CN 201710882634 A CN201710882634 A CN 201710882634A CN 107592138 A CN107592138 A CN 107592138A
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Abstract
The invention discloses a kind of power line Adaptive impedance matching method, comprise the following steps, first measure power line floating voltage and write down data, pure resistance is connected on power line, output voltage is surveyed again, by the output impedance for calculating power line, whether the output impedance that power line is detected by microprocessor matches with communication system load impedance, the output impedance of power line and load impedance match then microprocessor without handling work, the output impedance of power line mismatches with load impedance, microprocessor is exchanged the data with electric capacity and calculated, the input of high pressure coupled capacitor and power line is connected.The present invention can detect the output impedance of power line in real time, calculated by microprocessor and adjust the variable capacitance of output circuit, the output impedance and communication system load impedance for making output circuit match, and carry out retrieval repeatedly, ensure the output impedance and communication system load impedance real-time matching of output circuit, improve communication quality.
Description
Technical field
The present invention relates to technical field of electric power communication, more particularly to a kind of power line Adaptive impedance matching method.
Background technology
Power carrier communication system is by the use of power line as communication media, by being modulated demodulation to signal, is realized
Utilize the purpose of power line transmission data.
Power line is the very violent amount of a change to the load characteristic of carrier signal, can be with signal frequency and time
Change change in very large range, power line networking is complicated, plus channel is weak, noise jamming and electromagnetic compatibility etc.
Influence so that power line impedance changes at random with the time, has had a strong impact on communication quality.
Need to realize Adaptive impedance matching to the load impedance of carrier communication equipment to solve the above problems, survey in real time
Its impedance value is measured, selects the value of compensation inductance or electric capacity to offset reactance so that the load of carrier communication equipment remains constant
Value.
The content of the invention
Based on technical problem existing for background technology, the present invention proposes a kind of power line Adaptive impedance matching method.
A kind of power line Adaptive impedance matching method proposed by the present invention, comprises the following steps；
S1：First measure power line floating voltage and write down data, pure resistance is connected on power line, then survey output voltage,
By the output impedance for calculating power line；
S2：Whether the output impedance that power line is detected by microprocessor matches with communication system load impedance, electric power
The output impedance of line matches then with load impedance, and microprocessor is without handling work, and the output impedance of power line is with loading resistance
Anti- mismatch, microprocessor are exchanged the data with electric capacity and calculated；
S3：The input of high pressure coupled capacitor and power line is connected, in the one end of high pressure coupled capacitor away from power line
Wave filter is accessed, coupling transformer is connected in filter output, variable capacitance is connected in the output end of coupling transformer；
S4：Microprocessor is exchanged the data with electric capacity and calculated, and coupling transformer is adjusted by the numerical value for adjusting electric capacity
With the output impedance on variable capacitance composition output circuit, make the output on coupling transformer and variable capacitance composition output circuit
Impedance matches with communication system load impedance；
S5：Resend test signal, test the output impedance of output circuit, and by the output impedance with and communication system
Load impedance contrasts, and the output impedance with communication system load impedance with matching, then processing procedure terminates, if the output impedance
Mismatched with communication system load impedance, then repeat the above process.
Preferably, the power line input input test signal, adjusting signal intensity, reaches the output voltage of amplifier
Rated output voltage U1, keep test signal constant, connect a variable resistive load, descending regulation load, make output
Untill electric current reaches the output-current rating of amplifier, load resistor value R and output voltage U2 now are measured, according to r=R (U1-
U2)/U2 calculates output impedance.
Preferably, the communication system load impedance is 75 ± 0.5 Ω, and the output end of output circuit is connected with power and put
Big device, power amplifier are used for level signal in amplification output circuit.
Preferably, the variable capacitance uses varactor, and varactor is connected with A/D data converters.
Beneficial effects of the present invention are：The present invention can detect the output impedance of power line in real time, by the output of power line
Impedance contrasts with communication system load impedance, and whether the output impedance for detecting power line matches with communication system load impedance, leads to
The output impedance of detection output circuit is crossed, is calculated by microprocessor and adjusts the variable capacitance of output circuit, make output circuit
Output impedance match with communication system load impedance, and carry out retrieval repeatedly, it is ensured that the output impedance of output circuit with
Communication system load impedance real-time matching, improve communication quality.
Brief description of the drawings
Fig. 1 is a kind of workflow structure schematic diagram of power line Adaptive impedance matching method proposed by the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.
A kind of reference picture 1, power line Adaptive impedance matching method, comprises the following steps；
S1：First measure power line floating voltage and write down data, pure resistance is connected on power line, then survey output voltage,
By the output impedance for calculating power line；
S2：Whether the output impedance that power line is detected by microprocessor matches with communication system load impedance, electric power
The output impedance of line matches then with load impedance, and microprocessor is without handling work, and the output impedance of power line is with loading resistance
Anti- mismatch, microprocessor are exchanged the data with electric capacity and calculated；
S3：The input of high pressure coupled capacitor and power line is connected, in the one end of high pressure coupled capacitor away from power line
Wave filter is accessed, coupling transformer is connected in filter output, variable capacitance is connected in the output end of coupling transformer；
S4：Microprocessor is exchanged the data with electric capacity and calculated, and coupling transformer is adjusted by the numerical value for adjusting electric capacity
With the output impedance on variable capacitance composition output circuit, make the output on coupling transformer and variable capacitance composition output circuit
Impedance matches with communication system load impedance；
S5：Resend test signal, test the output impedance of output circuit, and by the output impedance with and communication system
Load impedance contrasts, and the output impedance with communication system load impedance with matching, then processing procedure terminates, if the output impedance
Mismatched with communication system load impedance, then repeat the above process.
In the present invention, power line input input test signal, adjusting signal intensity, the output voltage of amplifier is set to reach volume
Determine output voltage U1, keep test signal constant, connect a variable resistive load, descending regulation load, make output electric
Untill stream reaches the output-current rating of amplifier, load resistor value R and output voltage U2 now are measured, according to r=R (U1-
U2)/U2 calculates output impedance, and communication system load impedance is 75 ± 0.5 Ω, and the output end of output circuit is connected with power
Amplifier, power amplifier are used for level signal in amplification output circuit, and variable capacitance uses varactor, and the pole of transfiguration two
Pipe is connected with A/D data converters.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (4)
- A kind of 1. power line Adaptive impedance matching method, it is characterised in that comprise the following steps；S1：First measure power line floating voltage and write down data, pure resistance is connected on power line, then survey output voltage, pass through Calculate the output impedance of power line；S2：Whether the output impedance that power line is detected by microprocessor matches with communication system load impedance, power line Output impedance matches then with load impedance, and microprocessor is without handling work, and the output impedance and load impedance of power line are not Matching, microprocessor are exchanged the data with electric capacity and calculated；S3：The input of high pressure coupled capacitor and power line is connected, in one end access of the high pressure coupled capacitor away from power line Wave filter, coupling transformer is connected in filter output, variable capacitance is connected in the output end of coupling transformer；S4：Microprocessor is exchanged the data with electric capacity and calculated, and the numerical value by adjusting electric capacity adjusts coupling transformer and can The output impedance become on electric capacity composition output circuit, make the output impedance on coupling transformer and variable capacitance composition output circuit Match with communication system load impedance；S5：Test signal is resend, tests the output impedance of output circuit, and by the output impedance with being loaded with communication system Impedance contrast, the output impedance with communication system load impedance with matching, then processing procedure terminates, if the output impedance is with leading to Believe system load impedance mismatch, then repeat the above process.
- 2. a kind of power line Adaptive impedance matching method according to claim 1, it is characterised in that the power line is defeated Enter and hold input test signal, adjusting signal intensity, the output voltage of amplifier is reached rated output voltage U1, keep test signal It is constant, a variable resistive load is connected, descending regulation loads, and output current is reached the output-current rating of amplifier and is Only, load resistor value R and output voltage U2 now is measured, output impedance is calculated according to r=R (U1-U2)/U2.
- A kind of 3. power line Adaptive impedance matching method according to claim 1, it is characterised in that the communication system Load impedance is 75 ± 0.5 Ω, and the output end connection power amplifier of output circuit, power amplifier are used to amplify output Level signal in circuit.
- A kind of 4. power line Adaptive impedance matching method according to claim 1, it is characterised in that the variable capacitance Using varactor, and varactor is connected with A/D data converters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710882634.8A CN107592138A (en) | 2017-09-26 | 2017-09-26 | A kind of power line Adaptive impedance matching method |
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| CN201710882634.8A CN107592138A (en) | 2017-09-26 | 2017-09-26 | A kind of power line Adaptive impedance matching method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109495136A (en) * | 2018-12-29 | 2019-03-19 | 重庆邮电大学 | A kind of vehicle mounted electric line of force communication Adaptive impedance matching method |
| CN110417437A (en) * | 2019-08-27 | 2019-11-05 | 昆山网电科技有限公司 | Low-impedance line path transmission method based on high-speed power carrier wave |
| CN110535490A (en) * | 2019-07-19 | 2019-12-03 | 重庆源联信息科技有限公司 | Impedance matching system and method in a kind of power line communication |
| AT522527A1 (en) * | 2019-05-03 | 2020-11-15 | Seibt Kristl & Co Gmbh | Battery simulator with compensation impedance |
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| US20110214811A1 (en) * | 2010-03-04 | 2011-09-08 | Tokyo Electron Limited | Automatic matching method, computer-readable storage medium, automatic matching unit, and plasma processing apparatus |
| CN103270669A (en) * | 2010-12-24 | 2013-08-28 | 丰田自动车株式会社 | Contactless power supply system, vehicle, power supply facility, and contactless power supply system control method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109495136A (en) * | 2018-12-29 | 2019-03-19 | 重庆邮电大学 | A kind of vehicle mounted electric line of force communication Adaptive impedance matching method |
| AT522527A1 (en) * | 2019-05-03 | 2020-11-15 | Seibt Kristl & Co Gmbh | Battery simulator with compensation impedance |
| US11828808B2 (en) | 2019-05-03 | 2023-11-28 | Kristl, Seibt & Co. Gesellschaft M.B.H. | Battery simulator having compensation impedance |
| CN110535490A (en) * | 2019-07-19 | 2019-12-03 | 重庆源联信息科技有限公司 | Impedance matching system and method in a kind of power line communication |
| CN110535490B (en) * | 2019-07-19 | 2022-02-22 | 重庆源联信息科技有限公司 | Impedance matching system and method in power line communication |
| CN110417437A (en) * | 2019-08-27 | 2019-11-05 | 昆山网电科技有限公司 | Low-impedance line path transmission method based on high-speed power carrier wave |
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