Electronic leakage carrier wave metering circuit

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By adopting electronic leakage carrier metering circuits in the circuit, including carrier communication circuits, power supply protection circuits and other modules, the problems of complex design, high cost and insufficient stability in high voltage environments are solved, and the circuit is simple design, low cost and high reliability are achieved.

CN222979693UActive Publication Date: 2025-06-13张武

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Patent Information

Application Number: CN202421748516.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-07-23
Publication Date: 2025-06-13
Estimated Expiration: 2034-07-23

AI Technical Summary

Technical Problem

Existing circuits have problems such as complex design, high cost and insufficient stability when dealing with high voltage level circuits.

Method used

Electronic leakage carrier metering circuits are adopted, including carrier communication circuits, power supply protection circuits, PWM control circuits, power supply filtering stabilization circuits and optocouple isolation drive circuits, and efficient data transmission, power supply protection and stability improvement are achieved through these modules.

Benefits of technology

It realizes the simple design of the circuit, low cost and high reliability, can effectively protect the circuit from damage in high voltage environments and provide a stable power supply.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to an electronic leakage carrier wave metering circuit comprising a power line carrier wave module, the power line carrier wave module comprises a carrier wave communication circuit, a power supply protection circuit, a PWM control circuit, a power supply filtering stabilization circuit and an optical coupler isolation driving circuit, and the carrier wave communication circuit is electrically connected with the PWM control circuit. The output end of the PWM control circuit is connected with the input end of the optocoupler isolation driving circuit, the output end of the power supply protection circuit is connected with the input end of the power supply filtering and stabilizing circuit, and the power supply filtering and stabilizing circuit provides working voltage for the carrier communication circuit, the PWM control circuit and the optocoupler isolation driving circuit respectively. According to the utility model, the carrier communication circuit is adopted, high-efficiency data transmission is realized through the power line, additional wiring is not needed, the cost is reduced, the convenience and efficiency of data transmission are improved, and meanwhile, carrier communication also has the advantages of strong anti-interference capability, long communication distance and the like.

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Description

Technical Field

[0001] The utility model relates to the technical field of electric power metering, in particular to an electronic leakage carrier metering circuit. Background Art

[0002] In the power system, with the continuous growth of industrial production and energy demand, higher requirements are put forward for the stability and safety of power supply. Especially in high-risk industries such as coal mines, mines, petrochemicals, etc., due to the complex working environment and high voltage levels (such as 380V, 660V, 1140V, etc.), the protection of electrical equipment is particularly important. Traditional circuit breakers play an important role in protecting the circuit from faults such as short circuits and overloads. However, when the existing circuits are applied to high-voltage level circuits, they often have problems such as complex design, high cost, and insufficient stability. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide an electronic leakage carrier metering circuit with simple circuit, low cost and high reliability.

[0004] To achieve the above purpose, the utility model adopts such an electronic leakage carrier metering circuit, which includes a power line carrier module. The power line carrier module includes a carrier communication circuit, a power protection circuit, a PWM control circuit, a power filter and stabilization circuit, and an optocoupler isolation and drive circuit. The carrier communication circuit is electrically connected to the PWM control circuit. The output end of the PWM control circuit is connected to the input end of the optocoupler isolation and drive circuit. The output end of the power protection circuit is connected to the input end of the power filter and stabilization circuit. The power filter and stabilization circuit provides working voltages for the carrier communication circuit, the PWM control circuit, and the optocoupler isolation and drive circuit respectively.

[0005] The utility model is further set to further include an electric energy metering module. The electric energy metering module includes an electric energy metering circuit, a signal isolation and transmission circuit, a crystal oscillator circuit, an SPI communication circuit, a current sampling circuit, a voltage sampling circuit, and an optocoupler isolation and protection circuit. The output ends of the current sampling circuit, the voltage sampling circuit, and the crystal oscillator circuit are respectively connected to the input end of the electric energy metering module. The output end of the electric energy metering module is respectively connected to the input ends of the signal isolation and transmission circuit and the SPI communication circuit. The output end of the signal isolation and transmission circuit is connected to the input end of the optocoupler isolation and protection circuit.

[0006] The utility model is further configured such that the carrier communication circuit includes a transformer package TRANS1, an inductor L1, electrolytic capacitors CE1, CE2, CE5, capacitors C1, C2, C8, C34, diodes D2, D5, D7, D10, resistors R15, R17, R19, R40, R41. The first pin end of the primary side of the transformer package TRANS1 is connected to the +510V power supply, one end of the capacitor C34, and one end of the resistor R41. The other end of the resistor R41 is connected to one end of the resistor R40. The other end of the resistor R40 is respectively connected to the other end of the capacitor C34 and the negative electrode of the diode D5. The positive electrode of the diode D5 is respectively connected to the third pin end of the primary side of the transformer package TRANS1 and the SW_O end. The sixth pin end of the primary side of the transformer package TRANS1 is connected to the positive electrode of the diode D10. The negative electrode of the diode D10 is connected to one end of the resistor R17. The other end of the resistor R17 is respectively connected to one end of the capacitor C1, the positive electrode of the electrolytic capacitor CE5, and the third pin P_VDD end of the PWM control chip IC1. The negative electrode of the electrolytic capacitor CE5, the other end of the capacitor C1, and the fourth pin of the primary side of the transformer package TRANS1 are all connected to P_GND for grounding. The eighth pin end of the secondary side of the transformer package TRANS1 is respectively connected to one end of the resistor R15 and the positive electrode of the diode D2. The other end of the resistor R15 is connected to one end of the capacitor C8. The other end of the capacitor C8 is respectively connected to the negative electrode of the diode D2, the positive electrode of the electrolytic capacitor CE1, and one end of the inductor L1, and outputs the +F_12V voltage. The other end of the inductor L1 is connected to the +12V power supply. The seventh pin end of the primary side of the transformer package TRANS1 and the negative electrode of the electrolytic capacitor CE1 are both grounded. The twelfth pin end of the secondary side of the transformer package TRANS1 is respectively connected to one end of the resistor R19 and the positive electrode of the diode D7. The other end of the resistor R19 is connected to one end of the capacitor C2. The other end of the capacitor C2 is respectively connected to the negative electrode of the diode D7 and the positive electrode of the electrolytic capacitor CE2, and outputs the RS_IN_VDD voltage. The eleventh pin end of the secondary side of the transformer package TRANS1 and the negative electrode of the electrolytic capacitor CE2 are both connected to RS_GND for grounding.

[0007] The present utility model is further configured such that the PWM control circuit includes a PWM control chip IC1, resistors R1, R3, R5, R7 to R8, R12, a diode D9, and a field effect transistor Q16. One end of resistor R1 and one end of resistor R3 are both connected to the first pin CS terminal of the PWM control chip IC1, and the other end of resistor R1 and the other end of resistor R3 are both connected to the P_GND terminal. Resistor R5 is sequentially connected in series with resistors R7, R8, and R12. One end of resistor R5 is connected to the positive voltage source +510V, and one end of resistor R12 is respectively connected to the negative electrode of diode D9 and the gate of field effect transistor Q16. The positive electrode of diode D9 and the source of field effect transistor Q16 are respectively connected to the SW terminal of the PWM control chip IC1, and the drain of field effect transistor Q16 is connected to SW_O.

[0008] The present utility model is further configured such that the optocoupler isolation drive circuit includes an optocoupler U1, resistors R32 to R33, R34 to R36, capacitors C4, C6, C9, and a voltage stabilizing diode IC4. The positive electrode of the light emitting end of the optocoupler U1 is respectively connected to one end of resistor R32 and one end of resistor R34. The other end of resistor R32 is connected to the +F_12V power supply. The negative electrode of the light emitting end of the optocoupler U1 is respectively connected to the other end of resistor R34, one end of capacitor C6, one end of capacitor C9, and the negative electrode of the voltage stabilizing diode IC4. The other end of capacitor C6 is respectively connected to one end of resistor R33, one end of resistor R35, one end of resistor R36, and the common positive electrode of the voltage stabilizing diode IC4. The other end of resistor R33 is connected to the +12V power supply. The other end of resistor R35 is connected to the other end of capacitor C9. The other end of resistor R36 and the positive electrode of the voltage stabilizing diode IC4 are both grounded. The emitter of the light receiving end of the optocoupler U1 and one end of capacitor C4 are both grounded. The collector of the light receiving end of the optocoupler U1 and the other end of capacitor C4 are both connected to the fourth pin FB terminal of the PWM control chip IC1.

[0009] The present utility model is further configured such that the power protection circuit includes a resistor RF2, a resistor RF3, a varistor UR1, a varistor UR2, a rectifying diode D13, a rectifying diode D15, a rectifying diode D8, a rectifying diode D12, and an interface connector CN3. The B terminal of the second pin of the interface connector CN3 is connected to one end of the resistor RF3, and the other end of the resistor RF3 is connected to the positive electrode of the voltage source B_R. The C terminal of the third pin of the interface connector CN3 is connected to one end of the resistor RF2, and the other end of the resistor RF2 is connected to the negative electrode of the voltage source C_R. The varistors UR1 and UR2 are connected in parallel. One end of the varistor UR1 is connected to the negative electrode of the voltage source C_R, and one end of the varistor UR2 is connected to the positive electrode of the voltage source B_R. The rectifying diodes D13 and D15 are connected in series. The positive electrode of the rectifying diode D13 is connected to the negative voltage source -510V, and the negative electrode of the rectifying diode D15 is connected to the negative electrode of the voltage source C_R. The rectifying diodes D8 and D12 are connected in series. The negative electrode of the rectifying diode D12 is connected to the positive voltage source +510V, and the positive electrode of the rectifying diode D8 is connected to the positive electrode of the voltage source B_R.

[0010] The present utility model is further configured such that the power filtering and stabilizing circuit includes electrolytic capacitors CE7 to CE8, electrolytic capacitors CE3 to CE4, a resistor R20, resistors R23 to R24, a resistor R26, a resistor R28, resistors R45 to R47, a resistor R51, a resistor R53, and resistors R88 to R89. The positive electrode of the electrolytic capacitor CE7 is connected to the positive voltage source +510V and one end of the resistor R89. The negative electrode of the electrolytic capacitor CE7 is connected to one end of the resistor R20 and the positive electrode of the electrolytic capacitor CE8. The other end of the resistor R89 is connected to one end of the resistor R45. The other end of the resistor R45 is connected to the other end of the resistor R20. The other end of the resistor R20 is also connected to one end of the resistor R47. The other end of the resistor R47 is connected to one end of the resistor R46. The other end of the resistor R46 is connected to one end of the resistor R88. The other end of the resistor R88 is connected to the negative electrode of the electrolytic capacitor CE8, the positive electrode of the electrolytic capacitor CE4, and one end of the resistor R23. The other end of the resistor R23 is connected to one end of the resistor R24. The other end of the resistor R24 is connected to one end of the resistor R51. The other end of the resistor R51 is connected to the negative electrode of the electrolytic capacitor CE4, the positive electrode of the electrolytic capacitor CE3, one end of the resistor R28, and +1 / 4_POW. The other end of the resistor R28 is connected to one end of the resistor R26. The other end of the resistor R26 is connected to one end of the resistor R53. The other end of the resistor R53 and the negative electrode of the electrolytic capacitor CE3 are both connected to P_GND and the negative voltage source -510V.

[0011] The present utility model is further configured to further include a communication module. The communication module includes a PLC communication circuit and a 485 communication circuit. The 485 communication circuit includes a communication chip IC8, and the model of the communication chip IC8 is TP485.

[0012] The present utility model is further configured such that the PLC communication circuit is composed of a PLC communication interface M1, an interface connector CN1, a three-terminal voltage regulator IC9, a capacitor C15, a capacitor C16, and resistors PLC_R1 to PLC_R12.

[0013] The present utility model is further configured such that the power metering circuit includes a power metering chip U2, and the model of the power metering chip U2 is RN7306.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: By adopting a carrier communication circuit, high-efficient data transmission is achieved through power lines, eliminating the need for additional wiring, reducing costs, and improving the convenience and efficiency of data transmission. At the same time, carrier communication also has advantages such as strong anti-interference ability and long communication distance. By using a high-precision power metering chip, parameters such as current and voltage can be accurately measured, and the power consumption can be calculated, providing accurate data support for the management and maintenance of the power system. Additionally, by integrating a power protection circuit and using components such as varistors and rectifier diodes, overvoltage and reverse voltage in a high-voltage environment are effectively prevented from damaging the circuit, improving the safety and reliability of the circuit. Its power filter and stabilization circuit fully filters and stabilizes the input power through a combination of multiple capacitors and resistors, ensuring that the circuit can obtain a stable and clean power supply in a high-voltage environment, thereby improving the overall performance and stability of the circuit. Moreover, the PLC communication circuit and the 485 communication circuit are integrated, enabling the circuit to not only transmit data through power lines but also exchange data with other devices in a wired manner, improving the flexibility and expandability of the circuit. Description of the Drawings

[0015] Figure 1 is the principle block diagram of the power line carrier module of the embodiment of the present utility model.

[0016] Figure 2 is the principle block diagram of the power metering module of the embodiment of the present utility model.

[0017] Figure 3 is the schematic diagram of the carrier communication circuit of the embodiment of the present utility model.

[0018] Figure 4 is the schematic diagram of the PWM control circuit of the embodiment of the present utility model.

[0019] Figure 5 is the schematic diagram of the optocoupler isolation drive circuit of the embodiment of the present utility model.

[0020] Figure 6 It is the schematic diagram of the power protection circuit of the embodiment of the present utility model.

[0021] Figure 7 It is the schematic diagram of the power filter and stabilization circuit of the embodiment of the present utility model.

[0022] Figure 8 It is the schematic diagram of the electric energy metering circuit of the embodiment of the present utility model.

[0023] Figure 9 It is the schematic diagram of the current sampling circuit of the embodiment of the present utility model.

[0024] Figure 10 It is the schematic diagram of the voltage sampling circuit of the embodiment of the present utility model.

[0025] Figure 11 It is the schematic diagram of the crystal oscillation circuit of the embodiment of the present utility model.

[0026] Figure 12 It is the schematic diagram of the signal isolation and transmission circuit of the embodiment of the present utility model.

[0027] Figure 13 It is the schematic diagram of the SPI communication circuit of the embodiment of the present utility model.

[0028] Figure 14 It is the schematic diagram of the optocoupler isolation protection circuit of the embodiment of the present utility model.

[0029] Figure 15 It is the schematic diagram of the 485 communication circuit of the embodiment of the present utility model.

[0030] Figure 16 It is the schematic diagram of the PLC communication circuit of the embodiment of the present utility model.

[0031] Figure 17 It is the schematic diagram of the mixed signal module circuit of the embodiment of the present utility model. Specific embodiments

[0032] As Figures 1 - 17 shown, the embodiment of the present utility model provides an electronic leakage carrier metering circuit, including a power line carrier module, which includes a carrier communication circuit, a power protection circuit, a PWM control circuit, a power filter and stabilization circuit, and an optocoupler isolation and drive circuit. The carrier communication circuit is electrically connected to the PWM control circuit. The output end of the PWM control circuit is connected to the input end of the optocoupler isolation and drive circuit. The output end of the power protection circuit is connected to the input end of the power filter and stabilization circuit. The power filter and stabilization circuit provides working voltages for the carrier communication circuit, the PWM control circuit, and the optocoupler isolation and drive circuit respectively.

[0033] AsFigure 3 As shown, the carrier communication circuit includes a transformer package TRANS1, an inductor L1, electrolytic capacitors CE1, CE2, CE5, capacitors C1, C2, C8, C34, diodes D2, D5, D7, D10, resistors R15, R17, R19, R40, R41. Further, the first pin end of the primary side of the transformer package TRANS1 is connected to the +510V power supply, one end of the capacitor C34, and one end of the resistor R41. The other end of the resistor R41 is connected to one end of the resistor R40. The other end of the resistor R40 is respectively connected to the other end of the capacitor C34 and the negative electrode of the diode D5. The positive electrode of the diode D5 is respectively connected to the third pin end of the primary side of the transformer package TRANS1 and the SW_O end. The sixth pin end of the primary side of the transformer package TRANS1 is connected to the positive electrode of the diode D10. The negative electrode of the diode D10 is connected to one end of the resistor R17. The other end of the resistor R17 is respectively connected to one end of the capacitor C1, the positive electrode of the electrolytic capacitor CE5, and the third pin P_VDD end of the PWM control chip IC1. The negative electrode of the electrolytic capacitor CE5, the other end of the capacitor C1, and the fourth pin of the primary side of the transformer package TRANS1 are all connected to P_GND for grounding. The eighth pin end of the secondary side of the transformer package TRANS1 is respectively connected to one end of the resistor R15 and the positive electrode of the diode D2. The other end of the resistor R15 is connected to one end of the capacitor C8. The other end of the capacitor C8 is respectively connected to the negative electrode of the diode D2, the positive electrode of the electrolytic capacitor CE1, and one end of the inductor L1, and outputs the +F_12V voltage. The other end of the inductor L1 is connected to the +12V power supply. The seventh pin end of the primary side of the transformer package TRANS1 and the negative electrode of the electrolytic capacitor CE1 are both grounded. The twelfth pin end of the secondary side of the transformer package TRANS1 is respectively connected to one end of the resistor R19 and the positive electrode of the diode D7. The other end of the resistor R19 is connected to one end of the capacitor C2. The other end of the capacitor C2 is respectively connected to the negative electrode of the diode D7 and the positive electrode of the electrolytic capacitor CE2, and outputs the RS_IN_VDD voltage. The eleventh pin end of the secondary side of the transformer package TRANS1 and the negative electrode of the electrolytic capacitor CE2 are both connected to RS_GND for grounding.

[0034] As Figure 4As shown in the figure, the PWM control circuit includes a PWM control chip IC1, resistors R1, R3, R5, R7 - R8, R12, a diode D9, and a field - effect transistor Q16. Further, one end of resistor R1 and one end of resistor R3 are both connected to the first pin CS (current sampling) terminal of the PWM control chip IC1, and the other end of resistor R1 and the other end of resistor R3 are both connected to P_GND (ground). Resistor R5 is sequentially connected in series with resistors R7, R8, and R12 to form a voltage - dividing network. One end of resistor R5 is connected to the positive voltage source +510V, and one end of resistor R12 is connected to the negative electrode of diode D9 and the gate of field - effect transistor Q16, which is used to protect the circuit and provide a control signal. The positive electrode of diode D9 and the source of field - effect transistor Q16 are respectively connected to the SW terminal of the PWM control chip IC1, and the drain of field - effect transistor Q16 is connected to SW_O, which is used to control the current or voltage between SW and SW_O.

[0035] As Figure 5 As shown in the figure, the opto - coupled isolation drive circuit includes an opto - coupler U1, resistors R32 - R33, R34 - R36, capacitors C4, C6, C9, and a voltage - regulating diode IC4. Further, the positive electrode of the light - emitting end of opto - coupler U1 is respectively connected to one end of resistor R32 and one end of resistor R34. The other end of resistor R32 is connected to the +F_12V power supply. The negative electrode of the light - emitting end of opto - coupler U1 is respectively connected to the other end of resistor R34, one end of capacitor C6, one end of capacitor C9, and the negative electrode of voltage - regulating diode IC4. The other end of capacitor C6 is respectively connected to one end of resistor R33, one end of resistor R35, one end of resistor R36, and the common positive electrode of voltage - regulating diode IC4. The other end of resistor R33 is connected to the +12V power supply. The other end of resistor R35 is connected to the other end of capacitor C9. The other end of resistor R36 and the positive electrode of voltage - regulating diode IC4 are both grounded. The emitter of the light - receiving end of opto - coupler U1 and one end of capacitor C4 are both grounded. The collector of the light - receiving end of opto - coupler U1 and the other end of capacitor C4 are both connected to the fourth pin FB (feedback) terminal of the PWM control chip IC1 to achieve signal isolation and drive control.

[0036] As Figure 6As shown, the power protection circuit includes resistor RF2, resistor RF3, varistor UR1, varistor UR2, rectifier diode D13, rectifier diode D15, rectifier diode D8, rectifier diode D12, and interface connector CN3. Further, the B terminal of the second pin of interface connector CN3 is connected to one end of resistor RF3, and the other end of resistor RF3 is connected to the positive pole of voltage source B_R. The C terminal of the third pin of interface connector CN3 is connected to one end of resistor RF2, and the other end of resistor RF2 is connected to the negative pole of voltage source C_R. Varistors UR1 and UR2 are connected in parallel. One end of varistor UR1 is connected to the negative pole of voltage source C_R, and one end of varistor UR2 is connected to the positive pole of voltage source B_R. Rectifier diodes D13 and D15 are connected in series. The positive pole of rectifier diode D13 is connected to the negative voltage source -510V, and the negative pole of rectifier diode D15 is connected to the negative pole of voltage source C_R. Rectifier diodes D8 and D12 are connected in series. The negative pole of rectifier diode D12 is connected to the positive voltage source +510V, and the positive pole of rectifier diode D8 is connected to the positive pole of voltage source B_R. The negative voltage source -510V and the positive voltage source +510V are externally provided voltage sources.

[0037] As Figure 7 shown, the power filter and stabilization circuit includes electrolytic capacitors CE7 - CE8, electrolytic capacitors CE3 - CE4, resistor R20, resistors R23 - R24, resistor R26, resistor R28, resistors R45 - R47, resistor R51, resistor R53, resistors R88 - R89. Further, the positive pole of electrolytic capacitor CE7 is connected to the positive voltage source +510V and one end of resistor R89. The negative pole of electrolytic capacitor CE7 is connected to one end of resistor R20 and the positive pole of electrolytic capacitor CE8. The other end of resistor R89 is connected to one end of resistor R45. The other end of resistor R45 is connected to the other end of resistor R20. The other end of resistor R20 is also connected to one end of resistor R47. The other end of resistor R47 is connected to one end of resistor R46. The other end of resistor R46 is connected to one end of resistor R88. The other end of resistor R88 is connected to the negative pole of electrolytic capacitor CE8, the positive pole of electrolytic capacitor CE4, and one end of resistor R23. The other end of resistor R23 is connected to one end of resistor R24. The other end of resistor R24 is connected to one end of resistor R51. The other end of resistor R51 is connected to the negative pole of electrolytic capacitor CE4, the positive pole of electrolytic capacitor CE3, one end of resistor R28, and +1 / 4_POW (specific power supply point). The other end of resistor R28 is connected to one end of resistor R26. The other end of resistor R26 is connected to one end of resistor R53. The other end of resistor R53 and the negative pole of electrolytic capacitor CE3 are both connected to P_GND and the negative voltage source -510V.

[0038] As Figure 2As shown in the figure, the electric energy metering module includes an electric energy metering circuit, a signal isolation and transmission circuit, a crystal oscillator circuit, an SPI communication circuit, a current sampling circuit, a voltage sampling circuit, and an optocoupler isolation and protection circuit. The output terminals of the current sampling circuit, the voltage sampling circuit, and the crystal oscillator circuit are respectively connected to the input terminal of the electric energy metering module. The output terminal of the electric energy metering module is respectively connected to the input terminals of the signal isolation and transmission circuit and the SPI communication circuit. The output terminal of the signal isolation and transmission circuit is connected to the input terminal of the optocoupler isolation and protection circuit.

[0039] As Figure 8 shown in the figure, the electric energy metering circuit includes an electric energy metering chip U2, and the model of the electric energy metering chip U2 is RN7306.

[0040] As Figure 9 shown in the figure, the current sampling circuit includes a phase A current signal sampling circuit, a phase B current signal sampling circuit, and a phase C current signal sampling circuit with the same circuit structure. The phase A current signal sampling circuit includes an interface connector CN5, capacitors C40 - C41, resistors R62 - R63, and resistors R68 - R69. Further, the first pin IAP terminal of the interface connector CN5 is respectively connected to one end of the resistor R62 and one end of the resistor R68. The other end of the resistor R62 is respectively connected to the fifth pin I1P terminal of the electric energy metering chip U2 and one end of the capacitor C40. The other end of the capacitor C40 is connected to AGND. The other end of the resistor R68 is connected to AGND. One end of the resistor R63 and one end of the resistor R69 are both connected to IAN, and IAN is the negative input terminal of the phase A current. The other end of the resistor R63 is respectively connected to the sixth pin I1N terminal of the electric energy metering chip U2 and one end of the capacitor C41. The other end of the capacitor C41 is connected to AGND. The other end of the resistor R69 is connected to AGND.

[0041] As Figure 10 shown in the figure, the voltage signal sampling circuit includes a phase A voltage signal sampling circuit, a phase B voltage signal sampling circuit, and a phase C voltage signal sampling circuit with the same circuit structure. The phase A voltage signal sampling circuit includes capacitors C46 - C47 and resistors R74 - R75. Further, one end of the capacitor C46 is connected to the thirteenth pin VAP terminal of the electric energy metering chip U2, one end of the resistor R74, and the voltage monitoring point VOLA. The other end of the capacitor C46 is connected to AGND. The other end of the resistor R74 is connected to AGND. One end of the capacitor C47 is connected to the fourteenth pin VAN terminal of the electric energy metering chip U2 and one end of the resistor R75. The other end of the resistor R75 is connected to AGND. The other end of the capacitor C47 is connected to AGND.

[0042] As Figure 11As shown in the figure, the crystal oscillation circuit includes capacitor C33, capacitor C10, and crystal oscillator X1. Further, one end of the crystal oscillator X1 is respectively connected to the 40th pin m_XI terminal of the electric energy metering chip U2 and one end of the capacitor C33, and the other end of the crystal oscillator X1 is respectively connected to the 39th pin m_XI terminal of the electric energy metering chip U2 and one end of the capacitor C10. The other ends of the capacitor C33 and the capacitor C10 are both connected to AGND (analog ground).

[0043] As Figure 12 As shown in the figure, the signal isolation and transmission circuit includes interface connectors CN1, CN2, optocouplers U5, U9, U10, resistors R37, R38, and R43. Further, the positive electrode of the light-emitting end of the optocoupler U5 is connected to one end of the resistor R37, the other end of the resistor R37 is connected to the 29th pin HT_QCF terminal of the electric energy metering chip U2, the negative electrode of the light-emitting end of the optocoupler U5 is grounded, the emitter of the light-receiving end of the optocoupler U5 is connected to the 16th pin Q- terminal of the interface connector CN2, the collector of the light-receiving end of the optocoupler U5 is connected to the 13th pin Q+ terminal of the interface connector CN2, the positive electrode of the light-emitting end of the optocoupler U9 is connected to one end of the resistor R38, the other end of the resistor R38 is connected to the 28th pin HT_PCF terminal of the electric energy metering chip U2, the negative electrode of the light-emitting end of the optocoupler U9 is grounded, the emitter of the light-receiving end of the optocoupler U9 is connected to the 16th pin P- terminal of the interface connector CN2, the collector of the light-receiving end of the optocoupler U9 is connected to the 15th pin P+ terminal of the interface connector CN2, the positive electrode of the light-emitting end of the optocoupler U10 is connected to one end of the resistor R43, the other end of the resistor R43 is connected to the 16th pin MCU_SEC terminal of the interface connector CN1, the negative electrode of the light-emitting end of the optocoupler U10 is grounded, the emitter of the light-receiving end of the optocoupler U10 is connected to the 16th pin S- terminal of the interface connector CN2, and the collector of the light-receiving end of the optocoupler U10 is connected to the 11th pin S+ terminal of the interface connector CN2.

[0044] As Figure 13As shown in the figure, the SPI communication circuit includes an interface connector CN1, resistors R54 to R56, resistor R58, and capacitors C36 to C39. Further, one end of resistor R54 is connected to the ninth pin EMU_MISO terminal of interface connector CN1, and the other end of resistor R54 is respectively connected to the thirty-fifth pin SPDO terminal of the electric energy metering chip U2 and one end of capacitor C36. The other end of capacitor C36 is connected to AGND. One end of resistor R55 is connected to the eleventh pin EMU_CS terminal of interface connector CN1, and the other end of resistor R55 is respectively connected to the thirty-seventh pin SPCS terminal of the electric energy metering chip U2 and one end of capacitor C37. The other end of capacitor C37 is connected to AGND. One end of resistor R56 is connected to the eighth pin EMU_MOSI terminal of interface connector CN1, and the other end of resistor R56 is respectively connected to the thirty-eighth pin SPDI terminal of the electric energy metering chip U2 and one end of capacitor C38. The other end of capacitor C38 is connected to AGND. One end of resistor R58 is connected to the tenth pin EMU_CLK terminal of interface connector CN1, and the other end of resistor R58 is respectively connected to the thirty-sixth pin SPCK terminal of the electric energy metering chip U2 and one end of capacitor C39. The other end of capacitor C39 is connected to AGND.

[0045] As Figure 14 shown in the figure, the optocoupler isolation protection circuit includes optocoupler IC7, resistors R42 and R44, capacitor C25, interface connector CN1, and interface connector CN2. Further, the positive electrode of the light-emitting end of optocoupler IC7 is respectively connected to one end of resistor R44, one end of resistor R42, and one end of capacitor C25. The other end of resistor R44 is connected to the power supply RS_VDD. The negative electrode of the light-emitting end of optocoupler IC7 is respectively connected to the other end of capacitor C25, the other end of resistor R42, and the ninth pin RELEASE terminal of interface connector CN2. The collector of the light-receiving end of optocoupler IC7 is connected to the third pin RELEASE_MCU terminal of interface connector CN1, and the emitter of the light-receiving end of optocoupler IC7 is grounded.

[0046] As Figure 15 shown in the figure, the communication module includes a PLC communication circuit and a 485 communication circuit. The 485 communication circuit is communication chip IC8, and communication chip IC8 communicates through the TP485 interface. TP485 is a communication interface based on the RS485 standard.

[0047] As Figure 16As shown, the PLC communication circuit includes a PLC communication interface M1, an interface connector CN1, a three-terminal voltage regulator IC9, a capacitor C15, a capacitor C16, and resistors PLC_R1 to PLC_R12. Further, the first pin of the three-terminal voltage regulator IC9 is respectively connected to one end of the capacitor C15 and the high level +12V. The third pin of the three-terminal voltage regulator IC9 is respectively connected to one end of the capacitor C16 and the PLC +5V power supply. The second pin of the three-terminal voltage regulator IC9, the other end of the capacitor C15, and the other end of the capacitor C16 are all grounded. The fifth pin PLC_RXD of the PLC communication interface M1 is connected to one end of the resistor PLC_R1. The other end of the resistor PLC_R1 is respectively connected to the twenty-fifth pin PLC_RXD_IN of the interface connector CN1 and one end of the resistor PLC_R2. The other end of the resistor PLC_R2 is connected to VDD_DEV. The eighth pin PLC_TXD of the PLC communication interface M1 is connected to one end of the resistor PLC_R3. The other end of the resistor PLC_R3 is respectively connected to the twenty-sixth pin PLC_TXD_IN of the interface connector CN1 and one end of the resistor PLC_R4. The other end of the resistor PLC_R4 is connected to VDD_DEV. The tenth pin PLC_STA of the PLC communication interface M1 is connected to one end of the resistor PLC_R5. The other end of the resistor PLC_R5 is respectively connected to the twenty-third pin PLC_STA_IN of the interface connector CN1 and one end of the resistor PLC_R6. The other end of the resistor PLC_R6 is connected to VDD_DEV. The seventh pin PLC_SET of the PLC communication interface M1 is connected to one end of the resistor PLC_R7. The other end of the resistor PLC_R7 is respectively connected to the twenty-fourth pin PLC_SET_IN of the interface connector CN1 and one end of the resistor PLC_R8. The other end of the resistor PLC_R8 is connected to VDD_DEV. The eleventh pin PLC_INT of the PLC communication interface M1 is connected to one end of the resistor PLC_R9. The other end of the resistor PLC_R9 is respectively connected to the twenty-first pin PLC_INT_IN of the interface connector CN1 and one end of the resistor PLC_R10. The other end of the resistor PLC_R10 is connected to VDD_DEV. The ninth pin PLC_RST of the PLC communication interface M1 is connected to one end of the resistor PLC_R11. The other end of the resistor PLC_R11 is respectively connected to the twenty-second pin PLC_RST_IN of the interface connector CN1 and one end of the resistor PLC_R12. The other end of the resistor PLC_R12 is connected to VDD_DEV.

[0048] As Figure 17As shown, it further includes a mixed-signal module. The mixed-signal module includes interface connector CN3, resistors R2, R4, R6, R27, R48, R49, R50, R80, R81, R82, R9, R10, R11, R21, R57, R59, R61, R85, R86, R87, R90, R22, a three-terminal voltage regulator IC2, capacitors C3, C7, and C12. Further, the third pin of the three-terminal voltage regulator IC2 is respectively connected to the RS_IN_VDD power supply and one end of capacitor C7, and is filtered through capacitor C7. The first pin of the three-terminal voltage regulator IC2 is respectively connected to RS_VDD, one end of capacitor C3, and one end of capacitor C12, and is filtered through the parallel-connected capacitors C3 and C12 to provide a more stable output voltage. The other ends of capacitor C3, capacitor C12, capacitor C7, and the second pin of the three-terminal voltage regulator IC2 are all connected to RS_GND for grounding. Resistor R2 is sequentially connected in series with resistors R4, R6, R27, R48, R49, R50, R80, R81, R82. One end of resistor R82 is connected to one end of resistor R9, and the other end of resistor R9 is grounded. One end of resistor R2 is connected to the first pin A of interface connector CN3, and one end of resistor R9 is also connected to the VOLA monitoring point. The second pin B of interface connector CN3 is connected to one end of resistor RF3, and the other end of resistor RF3 is connected to the positive pole of voltage source B_R. The third pin C of interface connector CN3 is connected to one end of resistor RF2, and the other end of resistor RF2 is connected to the negative pole of voltage source C_R. Resistor R10 is sequentially connected in series with resistors R11, R21, R57, R59, R61, R85, R86, R87, R90. One end of resistor R90 is connected to one end of resistor R22, and the other end of resistor R22 is grounded. One end of resistor R22 is also connected to the VOLC monitoring point. One end of resistor R10 is connected to the negative pole of voltage source C_R, and the positive pole of voltage source B_R is connected to the VOLB monitoring point.

[0049] Of course, in addition to the above embodiments, the present invention may have many other embodiments. Without departing from the essence of the technical solution of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention. And if these changes or deformations are equivalent to the technical solutions in this patent, then these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention, and this utility model creation meets the actual R & D capabilities and resource conditions of the applicant.

Claims

1. An electronic leakage carrier measurement circuit, characterized in that: It includes a power line carrier module, which includes a carrier communication circuit, a power protection circuit, a PWM control circuit, a power filter stabilization circuit, and an optocoupler isolation drive circuit. The carrier communication circuit is electrically connected to the PWM control circuit, the output end of the PWM control circuit is connected to the input end of the optocoupler isolation drive circuit, the output end of the power protection circuit is connected to the input end of the power filter stabilization circuit, and the power filter stabilization circuit provides operating voltage for the carrier communication circuit, the PWM control circuit, and the optocoupler isolation drive circuit respectively.

2. The electronic leakage carrier measurement circuit according to claim 1 is characterized in that: It also includes an electric energy metering module, which includes an electric energy metering circuit, a signal isolation transmission circuit, a crystal oscillator circuit, an SPI communication circuit, a current sampling circuit, a voltage sampling circuit, and an optocoupler isolation protection circuit. The output end of the current sampling circuit, the output end of the voltage sampling circuit, and the output end of the crystal oscillator circuit are respectively connected to the input end of the electric energy metering module, and the output end of the electric energy metering module is respectively connected to the input end of the signal isolation transmission circuit and the input end of the SPI communication circuit, and the output end of the signal isolation transmission circuit is connected to the input end of the optocoupler isolation protection circuit.

3. The electronic leakage carrier measurement circuit according to claim 1 or 2, characterized in that: The carrier communication circuit includes a transformer package TRANS1, an inductor L1, an electrolytic capacitor CE1, an electrolytic capacitor CE2, an electrolytic capacitor CE5, a capacitor C1, a capacitor C2, a capacitor C8, a capacitor C34, a diode D2, a diode D5, a diode D7, a diode D10, a resistor R15, a resistor R17, a resistor R19, a resistor R40, and a resistor R41. The first pin end of the primary side of the transformer package TRANS1 is connected to a +510V power supply, one end of the capacitor C34, and one end of the resistor R41, and the other end of the resistor R41 is connected to One end of the resistor R40, the other end of the resistor R40 is respectively connected to the other end of the capacitor C34 and the cathode of the diode D5, the anode of the diode D5 is respectively connected to the third pin end and the SW_O end of the primary side of the transformer package TRANS1, the sixth pin end of the primary side of the transformer package TRANS1 is connected to the anode of the diode D10, the cathode of the diode D10 is connected to one end of the resistor R17, the other end of the resistor R17 is respectively connected to one end of the capacitor C1, the anode of the electrolytic capacitor CE5, and the third pin P_VDD end of the PWM control chip IC1, The negative electrode of the electrolytic capacitor CE5, the other end of the capacitor C1, and the fourth pin of the primary side of the transformer package TRANS1 are all connected to P_GND grounding, the eighth pin of the secondary side of the transformer package TRANS1 is respectively connected to one end of the resistor R15 and the positive electrode of the diode D2, the other end of the resistor R15 is connected to one end of the capacitor C8, the other end of the capacitor C8 is respectively connected to the negative electrode of the diode D2, the positive electrode of the electrolytic capacitor CE1, and one end of the inductor L1, and outputs a +F_12V voltage, the other end of the inductor L1 is connected to the +12V power supply, and the transformer The seventh pin end of the primary side of the package TRANS1 and the negative electrode of the electrolytic capacitor CE1 are both grounded, the twelfth pin end of the secondary side of the transformer package TRANS1 is respectively connected to one end of the resistor R19 and the positive electrode of the diode D7, the other end of the resistor R19 is connected to one end of the capacitor C2, the other end of the capacitor C2 is respectively connected to the negative electrode of the diode D7 and the positive electrode of the electrolytic capacitor CE2, and the RS_IN_VDD voltage is output, the eleventh pin end of the secondary side of the transformer package TRANS1 and the negative electrode of the electrolytic capacitor CE2 are both connected to RS_GND and grounded.

4. The electronic leakage carrier measurement circuit according to claim 1 or 2, characterized in that: The PWM control circuit includes a PWM control chip IC1, a resistor R1, a resistor R3, a resistor R5, resistors R7-R8, a resistor R12, a diode D9, and a field effect transistor Q16. One end of the resistor R1 and one end of the resistor R3 are connected to the first pin CS end of the PWM control chip IC1, and the other end of the resistor R1 and the other end of the resistor R3 are connected to the P_GND end. The resistor R5 is connected in series with resistor R7, resistor R8, and resistor R12 in sequence. One end of the resistor R5 is connected to a positive voltage source +510V, one end of the resistor R12 is respectively connected to the cathode of the diode D9 and the gate of the field effect transistor Q16, the anode of the diode D9 and the source of the field effect transistor Q16 are respectively connected to the SW end of the PWM control chip IC1, and the drain of the field effect transistor Q16 is connected to SW_O.

5. The electronic leakage carrier measurement circuit according to claim 1 or 2, characterized in that: The optical coupler isolation driving circuit includes an optical coupler U1, resistors R32-R33, resistors R34-R36, capacitors C4, capacitors C6, capacitors C9, and a voltage stabilizing diode IC4. The positive electrode of the light-emitting end of the optical coupler U1 is respectively connected to one end of the resistor R32 and one end of the resistor R34, and the other end of the resistor R32 is connected to a +F_12V power supply. The negative electrode of the light-emitting end of the optical coupler U1 is respectively connected to the other end of the resistor R34, one end of the capacitor C6, one end of the capacitor C9, and the negative electrode of the voltage stabilizing diode IC4. The other end of the capacitor C6 is connected to the negative electrode of the voltage stabilizing diode IC4. The ends are respectively connected to one end of the resistor R33, one end of the resistor R35, one end of the resistor R36, and the common positive electrode of the voltage-stabilizing diode IC4, the other end of the resistor R33 is connected to the +12V power supply, the other end of the resistor R35 is connected to the other end of the capacitor C9, the other end of the resistor R36 and the positive electrode of the voltage-stabilizing diode IC4 are grounded, the emitter of the light-receiving end of the optocoupler U1 and one end of the capacitor C4 are grounded, and the collector of the light-receiving end of the optocoupler U1 and the other end of the capacitor C4 are connected to the fourth pin FB of the PWM control chip IC1.

6. The electronic leakage carrier measurement circuit according to claim 1 or 2, characterized in that: The power protection circuit includes a resistor RF2, a resistor RF3, a varistor UR1, a varistor UR2, a rectifier diode D13, a rectifier diode D15, a rectifier diode D8, a rectifier diode D12, and an interface connector CN3. The second pin B end of the interface connector CN3 is connected to one end of the resistor RF3, and the other end of the resistor RF3 is connected to the positive electrode of the voltage source B_R. The third pin C end of the interface connector CN3 is connected to one end of the resistor RF2, and the other end of the resistor RF2 is connected to the negative electrode of the voltage source C_R. The resistors UR1 and UR2 are connected in parallel, one end of the varistor UR1 is connected to the negative electrode of the voltage source C_R, one end of the varistor UR2 is connected to the positive electrode of the voltage source B_R, the rectifier diodes D13 and D15 are connected in series, the positive electrode of the rectifier diode D13 is connected to the negative voltage source -510V, the negative electrode of the rectifier diode D15 is connected to the negative electrode of the voltage source C_R, the rectifier diodes D8 and D12 are connected in series, the negative electrode of the rectifier diode D12 is connected to the positive voltage source +510V, and the positive electrode of the rectifier diode D8 is connected to the positive electrode of the voltage source B_R.

7. The electronic leakage carrier measurement circuit according to claim 1 or 2, characterized in that: The power supply filtering and stabilizing circuit includes electrolytic capacitors CE7-CE8, electrolytic capacitors CE3-CE4, resistors R20, resistors R23-R24, resistor R26, resistor R28, resistors R45-R47, resistor R51, resistor R53, and resistors R88-R89. The positive electrode of the electrolytic capacitor CE7 is connected to a positive voltage source +510V and one end of the resistor R89, the negative electrode of the electrolytic capacitor CE7 is connected to one end of the resistor R20 and the positive electrode of the electrolytic capacitor CE8, the other end of the resistor R89 is connected to one end of the resistor R45, the other end of the resistor R45 is connected to the other end of the resistor R20, the other end of the resistor R20 is also connected to one end of the resistor R47, and the other end of the resistor R47 is connected to the resistor One end of resistor R46 and the other end of resistor R46 are connected to one end of resistor R88, the other end of resistor R88 is connected to the negative electrode of electrolytic capacitor CE8, the positive electrode of electrolytic capacitor CE4 and one end of resistor R23, the other end of resistor R23 is connected to one end of resistor R24, the other end of resistor R24 is connected to one end of resistor R51, the other end of resistor R51 is connected to the negative electrode of electrolytic capacitor CE4, the positive electrode of electrolytic capacitor CE3, one end of resistor R28 and +1 / 4_POW, the other end of resistor R28 is connected to one end of resistor R26, the other end of resistor R26 is connected to one end of resistor R53, the other end of resistor R53 and the negative electrode of electrolytic capacitor CE3 are both connected to P_GND and negative voltage source -510V.

8. The electronic leakage carrier measurement circuit according to claim 1 or 2, characterized in that: It also includes a communication module, which includes a PLC communication circuit and a 485 communication circuit. The 485 communication circuit includes a communication chip IC8, and the model of the communication chip IC8 is TP485.

9. The electronic leakage carrier measurement circuit according to claim 8, characterized in that: The PLC communication circuit is composed of a PLC communication interface M1, an interface connector CN1, a three-terminal regulator IC9, a capacitor C15, a capacitor C16, and resistors PLC_R1 to PLC_R12.

10. The electronic leakage carrier measurement circuit according to claim 2 is characterized in that: The electric energy metering circuit includes an electric energy metering chip U2, and the model of the electric energy metering chip U2 is RN7306.