CN103036593A - Low-voltage power line carrier communication circuit - Google Patents
Low-voltage power line carrier communication circuit Download PDFInfo
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- CN103036593A CN103036593A CN2012105845217A CN201210584521A CN103036593A CN 103036593 A CN103036593 A CN 103036593A CN 2012105845217 A CN2012105845217 A CN 2012105845217A CN 201210584521 A CN201210584521 A CN 201210584521A CN 103036593 A CN103036593 A CN 103036593A
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Abstract
The invention relates to a low-voltage power line carrier communication circuit. The circuit comprises a carrier control circuit, a zero-cross detection circuit and a signal coupling circuit. A signal amplifying filter circuit and a receiving filter circuit are arranged between the carrier control circuit and the signal coupling circuit. The signal amplifying filter circuit amplifies and filters analog signals output by the carrier control circuit, and then the analog signals enters into a power line information channel to be transmitted through the signal coupling circuit. The signals transmitted in the power line information channel is converted by the signal coupling circuit, then high-frequency interference is eliminated by the receiving filter circuit, and last the signals are transmitted to the carrier control circuit. The signal amplifying filter circuit is connected with a current-limiting circuit which is used for controlling the output current of the carrier control circuit. The zero-cross detection circuit is connected between the carrier control circuit and a power line, and is used for detecting power network power frequency signal zero passage. The low-voltage power line carrier communication circuit is simple in circuit, and is low in power dissipation, high in fidelity and high in carrier communication property due to the fact that the signal amplifying filter circuit and the current-limiting circuit are added.
Description
Technical field
The present invention relates to a kind of power carrier communication circuit, specifically, relate to a kind of low-voltage powerline carrier communication circuit that carries out data communication for intelligent electric meter by low-voltage power line.
Background technology
Power line carrier, PLC is a kind of communication mode that utilizes power line the transmission of data and voice signal.Progressively foundation along with national intelligent grid, voltage power-line carrier communication technology has obtained in depth using at electric energy and various energy measurements field, following electrical network must be electricity consumption, charging, be in communication in integrated automated system, because carrier communication utilizes power line itself as transmission channel, so that it has unrivaled advantage as means of communication, and power line carrier communication will be very extensive in range of application and the prospect in the fields such as electric appliance automatic control, therefore, power line carrier communication has huge economic benefit and significant social benefit.There are many factors that is unfavorable for the voltage power-line carrier communication technology development in right and China Power Grids, for example: mains by harmonics serious interference, change and non-linear when having caused network impedance without branch's topological structures many, that it is complicated of the pressure standard of electro instrument noise restriction, low-voltage network, under so abominable power grid environment, realize that the key of low-voltage power carrier mechanics of communication is to solve the problems such as impedance matching, power line signal decay, noise and interference of power line network.There are the problems such as circuit structure is complicated, cost is high, operating voltage range is narrow, fidelity is poor, current drain is excessive mostly in existing low-voltage powerline carrier communication circuit.
Summary of the invention
The present invention is directed to high, the thin problem of assurances degree students with poor academic records of complex structure, cost that existing power line carrier communication circuit exists, a kind of simple in structure, the carrier communication performance is high, low in energy consumption, antijamming capability is strong low-voltage powerline carrier communication circuit is provided.
Technical scheme of the present invention is: a kind of low-voltage powerline carrier communication circuit, this circuit comprises the carrier Control circuit, zero cross detection circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit between the described carrier Control circuit and signal coupling circuit, wherein, the signal filtering amplifying circuit amplifies the analog signal of carrier Control circuit output, after the filtering, the process signal coupling circuit enters in the power line channel and transmits, the signal that transmits in the power line channel is delivered to the carrier Control circuit after wave reception filtering circuit is eliminated High-frequency Interference after the signal coupling circuit conversion; Described signal filtering amplifying circuit is connected with current-limiting circuit, is used for the output current of control carrier Control circuit; Zero cross detection circuit is connected between carrier Control circuit and the power line, is used for power network power frequency component zero passage is detected.
Preferably, the carrier Control circuit has the carrier Control chip, and the carrier Control built-in chip type has analog front circuit.
Preferably, the carrier Control chip is connected with memory cell and interface circuit and indicator light, and wherein, memory cell adopts general EEPROM.
Preferably, signal coupling circuit comprises the high-pass filtering circuit that is comprised of signal coupling transformer T1 and capacitor C 11 and the TVS pipe F1 in parallel with this high-pass filtering circuit, wherein, high-pass filtering circuit is used for the industrial-frequency alternating current of isolated high voltage, and TVS pipe F1 is used for eliminating from the interference on the power line.
Preferably, wave reception filtering circuit comprises three grades of filter circuits, and wherein, first order filter circuit connects signal coupling circuit, and third level filter circuit connects the carrier Control circuit; Be parallel with clamp circuit between second level filter circuit and the third level filter circuit.
Preferably, first order filter circuit is the series filtering circuit that is comprised of resistance R 11, inductance L 1, capacitor C 12 and capacitor C 13, second level filter circuit is the parallel filtering circuit that is comprised of inductance L 2, capacitor C 15 and capacitor C 16, and third level filter circuit is the connection in series-parallel filter circuit that is comprised of inductance L 3, resistance R 12, capacitor C 17 and capacitor C 18; The output of third level filter circuit has been in series with the coupling capacitance C19 every straight-through friendship effect.
Preferably, clamp circuit is for being inverted the parallel circuits structure that composes in parallel by diode D3 and diode D4.
Preferably, signal amplification circuit filter has the class ab ammplifier chip, be provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit in this class ab ammplifier chip, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit all are connected with power amplification circuit; Also be provided with the intermediate reference voltage output circuit in the described class ab ammplifier chip.
Preferably, current-limiting circuit comprises current limliting triode Q7, control triode Q8 and control switch pipe Q9, wherein, the collector electrode of current limliting triode Q7 is connected with signal amplification circuit filter, the base stage of current limliting triode Q7 is connected with emitter with the collector electrode of control triode Q8 and is connected with base stage, the base stage of control switch pipe Q9 is connected with the carrier Control circuit, the grounded emitter of control switch pipe Q9; Current limliting triode Q7 base stage is connected with divider resistance R40 and divider resistance R41, and divider resistance R40 is connected with the collector electrode of control switch pipe Q9, and divider resistance R41 all is connected with+12 power supplys with the emitter of being connected triode Q8; Be connected with sampling resistor R38 and sampling resistor R39 in parallel between the base stage of control triode Q8 and the emitter.
Preferably, be connected with buffer resistance R36 between the emitter and collector of current limliting triode Q7; Be connected with divider resistance R37 between the base stage of the emitter of current limliting triode Q7 and control triode Q8.
Preferably, the output of current-limiting circuit is provided with filter capacitor C26.
Preferably, be in series with current-limiting resistance R42 between the base stage of control switch triode Q9 and the carrier Control circuit.
Preferably, zero cross detection circuit comprises isolation optocoupler E1, drives triode Q10 and secondary filter circuit, wherein, the collector electrode that drives triode Q10 is connected with isolation optocoupler E1, be used for controlling the break-make of isolation optocoupler E1, first order filter circuit is connected with power line, is used for eliminating the interference on the power line, second level filter circuit is connected with emitter with the base stage that drives triode Q10, is used for preventing from driving triode Q10 and misleads.
Preferably, first order filter circuit is the RC filter circuit that is comprised of resistance R 51, resistance R 52 and capacitor C 51, and second level filter circuit is the RC filter circuit that is comprised of resistance R 54 and capacitor C 53.
Preferably, the input of the first filter circuit is in series with diode D51, and output is parallel with divider resistance R53, and resistance R 51, resistance R 52 and divider resistance R53 form bleeder circuit.
Preferably, second level filter circuit is associated with storage capacitor C52, is used to isolation optocoupler E1 that the maintenance electric current is provided.
Preferably, described storage capacitor C52 also is parallel with voltage-stabiliser tube ZD1, and the voltage that is used for clamper C52 two ends is 5.1V.
Preferably, second level filter circuit also is parallel with protection diode D52.
Preferably, described telecommunication circuit also is provided with for the power circuit to the telecommunication circuit power supply, and this power circuit provides+the 5V power supply.
Preferably, power circuit comprises pressurizer TS1, and the input of pressurizer TS1 is connected with current-limiting circuit, and output is connected with filter capacitor C81 and C82 in parallel; Pressurizer TS1 adopts the 78L05 three terminal regulator.
The invention has the beneficial effects as follows: (1) circuit of the present invention is simple, has increased signal amplification circuit filter and current-limiting circuit, and is low in energy consumption, fidelity is high, and the carrier communication performance is high.(2) current-limiting circuit of the present invention's design, cut-off current is 120mA, cut-off current can not fluctuate with the variation of voltage, and has negative temperature coefficient, has reduced current loss.(3) signal amplification circuit filter of the present invention's design, gain amplifier is constant, and operating voltage range is wide, fidelity is high, and power line pollutes and reduces, and the performance of carrier communication improves.(4) the present invention is designed with wave reception filtering circuit, adopts three grades of filter circuits, and filtering performance is high, has improved interference free performance, so that carrier signal loss reduction, thereby improved receiving sensitivity.(5) the carrier Control circuit of the present invention design has the carrier Control chip, and the carrier Control built-in chip type has analog front circuit, has simplified circuit structure, has reduced cost.(6) zero cross detection circuit of the present invention's design is connected between carrier Control circuit and the power line, be used for power network power frequency component zero passage is detected, and strong anti-interference performance, accuracy of detection is high, and power consumption can be reduced to 0.025W.(7) the present invention has also designed power circuit, has avoided the unstable and high problem of noise of interface power supply.
Description of drawings
Accompanying drawing 1 is the structured flowchart of the specific embodiment of the invention.
Accompanying drawing 2 is the circuit theory diagrams of specific embodiment of the invention signal coupling circuit and wave reception filtering circuit.
Accompanying drawing 3 is the circuit theory diagrams of specific embodiment of the invention class ab ammplifier chip.
Accompanying drawing 4 is the functional block diagram of specific embodiment of the invention class ab ammplifier chip.
Accompanying drawing 5 is the circuit theory diagrams of specific embodiment of the invention current-limiting circuit.
Accompanying drawing 6 is the structured flowchart of specific embodiment of the invention current-limiting circuit.
Accompanying drawing 7 is the circuit theory diagrams of specific embodiment of the invention zero cross detection circuit.
Accompanying drawing 8 is the structured flowchart of specific embodiment of the invention zero cross detection circuit.
Accompanying drawing 9 is the circuit theory diagrams of specific embodiment of the invention power circuit.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
A kind of low-voltage powerline carrier communication circuit, this circuit comprises the carrier Control circuit, zero cross detection circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit between the described carrier Control circuit and signal coupling circuit, wherein, the signal filtering amplifying circuit amplifies the analog signal of carrier Control circuit output, after the filtering, the process signal coupling circuit enters in the power line channel and transmits, the signal that transmits in the power line channel is delivered to the carrier Control circuit after wave reception filtering circuit is eliminated High-frequency Interference after the signal coupling circuit conversion; Described signal filtering amplifying circuit is connected with current-limiting circuit, is used for the output current of control carrier Control circuit; Zero cross detection circuit is connected between carrier Control circuit and the power line, is used for power network power frequency component zero passage is detected.
In order to simplify circuit mechanism, reduce cost, above-mentioned carrier Control circuit has the carrier Control chip, and the carrier Control built-in chip type has analog front circuit.The carrier Control chip is connected with memory cell and interface circuit and indicator light, and wherein, memory cell adopts general EEPROM.
As shown in Figure 2; in order to protect internal circuit; elimination is disturbed from the high frequency high intensity on the power line; above-mentioned signal coupling circuit comprises the high-pass filtering circuit that is comprised of signal coupling transformer T1 and capacitor C 11 and the TVS pipe F1 in parallel with this high-pass filtering circuit; wherein; high-pass filtering circuit is used for the industrial-frequency alternating current of isolated high voltage, and TVS pipe F1 is used for eliminating from the interference on the power line.
In order further effectively to eliminate from the interference on the power line, above-mentioned wave reception filtering circuit comprises three grades of filter circuits, and wherein, first order filter circuit connects signal coupling circuit, and third level filter circuit connects the carrier Control circuit; Be parallel with clamp circuit between second level filter circuit and the third level filter circuit.
As shown in Figure 2, first order filter circuit is the series filtering circuit that is comprised of resistance R 11, inductance L 1, capacitor C 12 and capacitor C 13, second level filter circuit is the parallel filtering circuit that is comprised of inductance L 2, capacitor C 15 and capacitor C 16, third level filter circuit is the connection in series-parallel filter circuit that is comprised of inductance L 3, resistance R 12, capacitor C 17 and capacitor C 18, above-mentioned three grades of filter circuits form passive bandpass filters jointly, and the band that is used for eliminating from the power line disturbs outward; The output of third level filter circuit has been in series with the coupling capacitance C19 every straight-through friendship effect.
Clamp circuit is for being inverted the parallel circuits structure that composes in parallel by diode D3 and diode D4, utilize the forward conduction voltage of diode to come the output voltage at clamp diode D3 and diode D4 place, prevent from damaging the carrier Control chip at the overtension that is input to the carrier Control chip.
Shown in Fig. 3 and 4, constant in order to realize gain amplifier, improve the quality of fidelity and output signal, reducing power line pollutes, raise the carrier communication performance, above-mentioned signal amplification circuit filter has the class ab ammplifier chip, is provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit in this class ab ammplifier chip, and current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit all are connected with power amplification circuit; Also be provided with the intermediate reference voltage output circuit in the described class ab ammplifier chip.
As illustrated in Figures 5 and 6, in order to realize that cut-off current does not fluctuate with the variation of voltage, and the characteristic with negative temperature coefficient, reduce the consumption of electric current, above-mentioned current-limiting circuit comprises current limliting triode Q7, control triode Q8 and control switch pipe Q9, wherein, the collector electrode of current limliting triode Q7 is connected with signal amplification circuit filter, the base stage of current limliting triode Q7 is connected with emitter with the collector electrode of control triode Q8 and is connected with base stage, the base stage of control switch pipe Q9 is connected with the carrier Control circuit, the grounded emitter of control switch pipe Q9; Current limliting triode Q7 base stage is connected with divider resistance R40 and divider resistance R41, and divider resistance R40 is connected with the collector electrode of control switch pipe Q9, and divider resistance R41 all is connected with+12 power supplys with the emitter of being connected triode Q8; Be connected with sampling resistor R38 and sampling resistor R39 in parallel between the base stage of control triode Q8 and the emitter.
In order to prevent that output voltage falls when control switch pipe Q9 turn-offs, be connected with buffer resistance R36 between the emitter and collector of above-mentioned current limliting triode Q7; Be connected with divider resistance R37 between the base stage of the emitter of current limliting triode Q7 and control triode Q8, guarantee when the voltage at sampling resistor R38 and sampling resistor R39 two ends is higher than 0.6V the voltage of the approximate current limliting triode Q7 base-emitter end of voltage of collector electrode-emitter terminal of control triode Q8.When the voltage at current sampling resistor R38 and R39 two ends is higher than 0.6V, control triode Q8 conducting, collector electrode and the voltage between the emitter of control triode Q8 can be reduced to about 0.3V, divider resistance R37 is the less resistance of resistance, when the collector electrode of control triode Q8 and the voltage between the emitter can be reduced to 0.3V, the collector electrode B of current limliting triode Q7 and the voltage between the emitter is the approximate 0.3V that reduces to also, this moment, current limliting triode Q7 turn-offed, and the emitter current of current limliting triode Q7 stops.
The output of current-limiting circuit is provided with filter capacitor C26.
Be in series with current-limiting resistance R42 between the base stage of control switch triode Q9 and the carrier Control circuit, when current-limiting resistance R42 did not work, control switch triode Q9 blocked the electric current of divider resistance R40 and R41, reduced quiescent dissipation, had reached energy-conservation purpose.
Divider resistance R40 and R41 provide base voltage for current limliting triode Q7, when the voltage drop of+12V power supply, and the base stage of current limliting triode Q7 and the voltage U between the emitter
BeAlso can reduce, when the base stage of current limliting triode Q7 and the voltage U between the emitter
BeWhen being lower than 0.6V, current limliting triode Q7 turn-offs, and the emitter current of current limliting triode Q7 stops, and has reached the purpose of under-voltage protection.
When current-limiting circuit enters current-limit mode, the temperature of current limliting triode Q7 rises, control triode Q8 also can receive the heat that current limliting triode Q7 passes over raises its temperature, after the temperature of current limliting triode Q7 and control triode Q8 raises, its separately base stage and the voltage U between the emitter
BeReduce, cut-off current reduces, and makes current-limiting circuit have the characteristic of negative temperature coefficient.
The current-limiting circuit of the invention has been carried out the test of Current Limits flow valuve, and carried out the test of negative temperature coefficient feature, when negative temperature coefficient was measured, for convenient test, supply voltage was set to+12V.Test result is as shown in the table:
Cut-off current under the different voltages of table 1 is measured
| Sequence number | Supply voltage (V) | Cut-off current (mA) |
| 1 | 6 | 61 |
| 2 | 7 | 86 |
| 3 | 8 | 103 |
| 4 | 9 | 112 |
| 5 | 10 | 115 |
| 6 | 11 | 118 |
| 7 | 12 | 120 |
| 8 | 13 | 121 |
| 9 | 14 | 122 |
| 10 | 15 | 123 |
| 11 | 16 | 124 |
| 12 | 17 | 125 |
| 13 | 18 | 125 |
| 14 | 19 | 125 |
| 15 | 20 | 125 |
| 16 | 22 | 125 |
| 17 | 24 | 125 |
| 18 | 26 | 125 |
| 19 | 28 | 125 |
| 20 | 30 | 125 |
Cut-off current under table 2 different temperatures is measured
| Sequence number | The triode temperature (℃) | Cut-off current (mA) |
| 1 | 20 | 123 |
| 2 | 30 | 120 |
| 3 | 40 | 116 |
| 4 | 50 | 112 |
| 5 | 60 | 108 |
| 6 | 70 | 104 |
| 7 | 80 | 101 |
| 8 | 90 | 97 |
| 9 | 100 | 93 |
| 10 | 110 | 90 |
| 11 | 120 | 86 |
| 12 | 130 | 82 |
| 13 | 140 | 78 |
| 14 | 150 | 75 |
Shown in Fig. 7 and 8, in order to improve accuracy of detection and to reduce power consumption, above-mentioned zero cross detection circuit comprises isolation optocoupler E1, drives triode Q10 and secondary filter circuit, wherein, the collector electrode that drives triode Q10 is connected with isolation optocoupler E1, is used for controlling the break-make of isolation optocoupler E1, first order filter circuit is connected with power line, be used for eliminating the interference on the power line, second level filter circuit is connected with emitter with the base stage that drives triode Q10, is used for preventing from driving triode Q10 and misleads.
First order filter circuit is the RC filter circuit that is comprised of resistance R 51, resistance R 52 and capacitor C 51, and second level filter circuit is the RC filter circuit that is comprised of resistance R 54 and capacitor C 53.
The input of the first filter circuit is in series with diode D51, and output is parallel with divider resistance R53, and resistance R 51, resistance R 52 and divider resistance R53 form bleeder circuit.
Second level filter circuit is associated with storage capacitor C52, is used to isolation optocoupler E1 that the maintenance electric current is provided.
Storage capacitor C52 also is parallel with voltage-stabiliser tube ZD1, and the voltage that is used for clamper C52 two ends is 5.1V.
Second level filter circuit also is parallel with protection diode D52.
Telecommunication circuit also is provided with for the power circuit to the telecommunication circuit power supply, and this power circuit provides+the 5V power supply.
As shown in Figure 9, above-mentioned power circuit comprises pressurizer TS1, the input of pressurizer TS1 is connected with current-limiting circuit, output is connected with filter capacitor C81 and C82 in parallel, the current drain of pressurizer TS1 can be calculated in the total current drain of current-limiting circuit+12V, thereby make+current drain of 12V surpasses 120mA; Pressurizer TS1 adopts the 78L05 three terminal regulator.
Claims (20)
1. low-voltage powerline carrier communication circuit, this circuit comprises the carrier Control circuit, zero cross detection circuit and signal coupling circuit, it is characterized in that: be connected with signal amplification circuit filter and wave reception filtering circuit between the described carrier Control circuit and signal coupling circuit, wherein, the signal filtering amplifying circuit amplifies the analog signal of carrier Control circuit output, after the filtering, the process signal coupling circuit enters in the power line channel and transmits, the signal that transmits in the power line channel is delivered to the carrier Control circuit after wave reception filtering circuit is eliminated High-frequency Interference after the signal coupling circuit conversion; Described signal filtering amplifying circuit is connected with current-limiting circuit, is used for the output current of control carrier Control circuit; Zero cross detection circuit is connected between carrier Control circuit and the power line, is used for power network power frequency component zero passage is detected.
2. low-voltage powerline carrier communication circuit according to claim 1, it is characterized in that: the carrier Control circuit has the carrier Control chip, and the carrier Control built-in chip type has analog front circuit.
3. low-voltage powerline carrier communication circuit according to claim 2, it is characterized in that: the carrier Control chip is connected with memory cell and interface circuit and indicator light, and wherein, memory cell adopts general EEPROM.
4. low-voltage powerline carrier communication circuit according to claim 1, it is characterized in that: signal coupling circuit comprises the high-pass filtering circuit that is comprised of signal coupling transformer T1 and capacitor C 11 and the TVS pipe F1 in parallel with this high-pass filtering circuit, wherein, high-pass filtering circuit is used for the industrial-frequency alternating current of isolated high voltage, and TVS pipe F1 is used for eliminating from the interference on the power line.
5. low-voltage powerline carrier communication circuit according to claim 1, it is characterized in that: wave reception filtering circuit comprises three grades of filter circuits, and wherein, first order filter circuit connects signal coupling circuit, and third level filter circuit connects the carrier Control circuit; Be parallel with clamp circuit between second level filter circuit and the third level filter circuit.
6. low-voltage powerline carrier communication circuit according to claim 5, it is characterized in that: the series filtering circuit of first order filter circuit for being formed by resistance R 11, inductance L 1, capacitor C 12 and capacitor C 13, second level filter circuit is the parallel filtering circuit that is comprised of inductance L 2, capacitor C 15 and capacitor C 16, and third level filter circuit is the connection in series-parallel filter circuit that is comprised of inductance L 3, resistance R 12, capacitor C 17 and capacitor C 18; The output of third level filter circuit has been in series with the coupling capacitance C19 every straight-through friendship effect.
7. low-voltage powerline carrier communication circuit according to claim 5 is characterized in that: the parallel circuits structure of clamp circuit for being composed in parallel by diode D3 and diode D4 inversion.
8. low-voltage powerline carrier communication circuit according to claim 1, it is characterized in that: signal amplification circuit filter has the class ab ammplifier chip, be provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit in this class ab ammplifier chip, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit all are connected with power amplification circuit; Also be provided with the intermediate reference voltage output circuit in the described class ab ammplifier chip.
9. low-voltage powerline carrier communication circuit according to claim 1, it is characterized in that: current-limiting circuit comprises current limliting triode Q7, control triode Q8 and control switch pipe Q9, wherein, the collector electrode of current limliting triode Q7 is connected with signal amplification circuit filter, the base stage of current limliting triode Q7 is connected with emitter with the collector electrode of control triode Q8 and is connected with base stage, the base stage of control switch pipe Q9 is connected with the carrier Control circuit, the grounded emitter of control switch pipe Q9; Current limliting triode Q7 base stage is connected with divider resistance R40 and divider resistance R41, and divider resistance R40 is connected with the collector electrode of control switch pipe Q9, and divider resistance R41 all is connected with+12 power supplys with the emitter of being connected triode Q8; Be connected with sampling resistor R38 and sampling resistor R39 in parallel between the base stage of control triode Q8 and the emitter.
10. low-voltage powerline carrier communication circuit according to claim 9 is characterized in that: be connected with buffer resistance R36 between the emitter and collector of current limliting triode Q7; Be connected with divider resistance R37 between the base stage of the emitter of current limliting triode Q7 and control triode Q8.
11. low-voltage powerline carrier communication circuit according to claim 9 is characterized in that: the output of current-limiting circuit is provided with filter capacitor C26.
12. low-voltage powerline carrier communication circuit according to claim 9 is characterized in that: be in series with current-limiting resistance R42 between the base stage of control switch triode Q9 and the carrier Control circuit.
13. low-voltage powerline carrier communication circuit according to claim 1, it is characterized in that: zero cross detection circuit comprises isolation optocoupler E1, drives triode Q10 and secondary filter circuit, wherein, the collector electrode that drives triode Q10 is connected with isolation optocoupler E1, be used for controlling the break-make of isolation optocoupler E1, first order filter circuit is connected with power line, be used for eliminating the interference on the power line, second level filter circuit is connected with emitter with the base stage that drives triode Q10, is used for preventing from driving triode Q10 and misleads.
14. low-voltage powerline carrier communication circuit according to claim 13, it is characterized in that: the RC filter circuit of first order filter circuit for being comprised of resistance R 51, resistance R 52 and capacitor C 51, second level filter circuit is the RC filter circuit that is comprised of resistance R 54 and capacitor C 53.
15. low-voltage powerline carrier communication circuit according to claim 14, it is characterized in that: the input of the first filter circuit is in series with diode D51, output is parallel with divider resistance R53, and resistance R 51, resistance R 52 and divider resistance R53 form bleeder circuit.
16. low-voltage powerline carrier communication circuit according to claim 13 is characterized in that: second level filter circuit is associated with storage capacitor C52, is used to isolation optocoupler E1 that the maintenance electric current is provided.
17. low-voltage powerline carrier communication circuit according to claim 16 is characterized in that: described storage capacitor C52 also is parallel with voltage-stabiliser tube ZD1, and the voltage that is used for clamper C52 two ends is 5.1V.
18. low-voltage powerline carrier communication circuit according to claim 13 is characterized in that: second level filter circuit also is parallel with protection diode D52.
19. low-voltage powerline carrier communication circuit according to claim 1 is characterized in that: described telecommunication circuit also is provided with for the power circuit to the telecommunication circuit power supply, and this power circuit provides+the 5V power supply.
20. low-voltage powerline carrier communication circuit according to claim 19 is characterized in that: power circuit comprises pressurizer TS1, the input of pressurizer TS1 is connected with current-limiting circuit, and output is connected with filter capacitor C81 and C82 in parallel; Pressurizer TS1 adopts the 78L05 three terminal regulator.
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| CN201210584521.7A CN103036593B (en) | 2012-12-30 | 2012-12-30 | Low-voltage power line carrier communication circuit |
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| CN104579429A (en) * | 2014-12-25 | 2015-04-29 | 厦门格绿能光电股份有限公司 | Power line carrier communication module |
| CN105006808A (en) * | 2015-06-29 | 2015-10-28 | 嘉兴恒创电力设计研究院有限公司 | Three-phase no-voltage undervoltage intelligent release for low voltage circuit breaker |
| CN104953542A (en) * | 2015-06-29 | 2015-09-30 | 嘉兴恒创电力设计研究院有限公司 | Intelligent three-phase no-voltage and under-voltage release |
| WO2017012144A1 (en) * | 2015-07-21 | 2017-01-26 | 杨永 | Power line carrier communication line driver based on constant power control of switch power source |
| CN106405205A (en) * | 2015-07-30 | 2017-02-15 | 钜泉光电科技(上海)股份有限公司 | Zero-crossing detection circuit |
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| CN107911144A (en) * | 2017-12-12 | 2018-04-13 | 淮阴工学院 | A kind of power line carrier communication means for anti-jamming |
| CN107911144B (en) * | 2017-12-12 | 2023-11-24 | 淮阴工学院 | Anti-interference device for power line carrier communication |
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