Power line carrier communication device

Abstract

The utility model relates to the technical field of electronic power, in particular to a power line carrier communication device, which is characterized by comprising a power supply circuit, a carrier communication circuit, a 485 communication circuit and a master control module, the power supply circuit is connected with a mains supply power line and is used for accessing alternating current and respectively providing power for the carrier communication circuit, the 485 communication circuit and the main control module; the carrier communication circuit is respectively connected with a mains supply power line and the main control module and is used for converting a power carrier signal input by the mains supply power line into a communication signal and transmitting the communication signal to the main control module and converting a communication signal output by the main control module into a power carrier signal and outputting the power carrier signal to the mains supply power line; therefore, communication between the first external device connected with the mains supply power line and the main control module is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic power, and more specifically, it relates to a power line carrier communication device. Background Art

[0002] Power line carrier technology is a modern technology that uses power lines as carriers for transmitting control signals. Since power lines are widely distributed, the technology of using low-voltage power lines as data signal transmission media enables users to build systems only by using existing resources, avoiding complicated channel wiring and greatly saving costs. With the continuous improvement of technology, power line carrier technology will have broad application prospects in the fields of home intelligent control, community property management, security alarm, etc.

[0003] However, the existing power line carrier communication devices have low intelligence and are not compatible with existing smart home systems, intelligent road lighting systems, commercial lighting control systems, etc. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a power line carrier communication device, which has the advantage of high intelligence.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions: A power line carrier communication device includes a power supply circuit, a carrier communication circuit, a 485 communication circuit and a main control module;

[0006] The power supply circuit is connected to the mains power line for accessing alternating current and providing power for the carrier communication circuit, the 485 communication circuit and the main control module respectively;

[0007] The carrier communication circuit is respectively connected to the mains power line and the main control module, and is used for converting the power line carrier signal input by the mains power line into a communication signal and transmitting it to the main control module, and converting the communication signal output by the main control module into a power line carrier signal and outputting it to the mains power line, so as to realize communication between the first external device connected to the mains power line and the main control module;

[0008] The 485 communication circuit is respectively connected to the 485 bus and the main control module, and is used for transmitting communication signals between the 485 bus and the main control module to realize communication between the second external device connected to the 485 bus and the main control module;

[0009] The main control module has an IO interface for connecting to a third external device to realize communication with the third external device.

[0010] In one embodiment, the carrier communication circuit includes a signal coupling module, a band-pass filtering module, a carrier chip, and a signal output module. One end of the signal coupling module is connected to the mains power line, and the other end of the signal coupling module is connected to the differential input end of the carrier chip through the band-pass filtering module. The differential output end of the carrier chip is connected to the other end of the signal coupling module through the signal output module. The carrier chip is also connected to the main control module.

[0011] In one embodiment, the signal coupling module includes an isolation coupler T1 and a coupling capacitor CX1. One end of the capacitor CX1 and the non-corresponding end of the primary winding of the isolation coupler T1 are respectively connected to the mains power line. The other end of the capacitor CX1 is connected to the corresponding end of the primary winding of the isolation coupler T1. The secondary winding of the isolation coupler T1 is connected to the band-pass filtering module;

[0012] The band-pass filtering module includes resistors R1, R2, R3 and coupling capacitors C1, C2, C3. The corresponding end of the secondary winding of the isolation coupler T1 is sequentially connected to the first differential input end of the carrier chip through the resistor R1 and the coupling capacitor C1. The non-corresponding end of the secondary winding of the isolation coupler T1 is sequentially connected to the second differential input end of the carrier chip through the resistor R3 and the coupling capacitor C3. The resistor R2 is connected between the coupling capacitor C1 and the coupling capacitor C3. The coupling capacitor C2 is connected between the resistor R1 and the coupling capacitor C3;

[0013] The signal output module includes resistors R4 and R5. The corresponding end of the secondary winding of the isolation coupler T1 is connected to the first differential output end of the carrier chip through the resistor R4. The non-corresponding end of the secondary winding of the isolation coupler T1 is connected to the second differential output end of the carrier chip through the resistor R5.

[0014] In one embodiment, the power line carrier communication device further includes a metering circuit and a switching circuit;

[0015] The output end of the power supply circuit is respectively connected to the metering circuit and the switching circuit, and is used to provide power for the metering circuit and the switching circuit;

[0016] The metering circuit is connected to the main control module, and is used to generate a zero-crossing signal according to the detected mains supply voltage and output it to the main control module;

[0017] The main control module is connected to a first load device through the switching circuit, and is used to control the on-off of the switching circuit according to the zero-crossing signal, so as to control the start and stop of the first load device.

[0018] In one embodiment, the metering circuit is further connected to the first load device for detecting the current of the first load device, and the main control module is further configured to determine the power-off state of the first load device according to the current of the first load device;

[0019] The metering circuit is further connected to the power supply circuit for detecting the current difference at the input end of the power supply circuit and determining the leakage state of the power line carrier communication device and the first load device according to the current difference.

[0020] In one embodiment, the metering module includes a metering chip U2, a current detection circuit, a leakage detection circuit and a zero-crossing signal circuit;

[0021] The current detection circuit includes capacitors C4, C6 and resistors R6, R9, R10. The resistor R6 is connected to pin 4 of the metering chip U2, the resistor R10 is connected to pin 3 of the metering chip U2, one end of the resistor R9 is connected to the resistor R6 and grounded, and the other end is connected to the resistor R10. The capacitors C4 and C6 are connected in series, and one end of the capacitor C4 is connected between the resistor R6 and the metering chip U2, and one end of the capacitor C6 is connected between the resistor R10 and the metering chip U2;

[0022] The leakage detection circuit includes capacitors C7, C8, resistors R11, R14, R15 and a current transformer CN1. One end of the resistor R11 is connected to pin 6 of the metering chip U2 and the other end is connected to the current transformer CN1. One end of the resistor R15 is connected to pin 5 of the metering chip U2 and the other end is connected to the current transformer CN1. One end of the resistor R14 is connected between the resistor R11 and the current transformer CN1, and the other end is connected between the resistor R15 and the current transformer CN1. The capacitors C7 and C8 are connected in series, and one end of the capacitor C7 is connected between the resistor R11 and the metering chip U2, and one end of the capacitor C8 is connected between the resistor R15 and the metering chip U2;

[0023] The zero-crossing signal circuit includes a capacitor C9 and resistors R18, 19, 20, 21, 22, 23. The resistors R18, 19, 20, 21, 22, 23 and pin 8 of the metering chip U2 are connected in series in sequence, and pin 8 of the metering chip U2 is grounded. The resistor R22 is connected to pin 7 of the metering chip U2, and one end of the capacitor C9 is connected to pin 7 of the metering chip U2 and the other end is connected to pin 8 of the metering chip U2.

[0024] In one embodiment, the power line carrier communication device further includes at least one of a 0-10V conversion circuit and a PWM signal enhancement circuit;

[0025] The power supply circuit is respectively connected to the 0-10V conversion circuit and the PWM signal enhancement circuit, and is used to provide power for the 0-10V conversion circuit and the PWM signal enhancement circuit;

[0026] The 0-10V conversion circuit is respectively connected to the main control module and the second load device, and is used to convert the PWM signal output by the main control module into a DC voltage signal and output it to the second load device to control the working state of the second load;

[0027] The PWM signal enhancement circuit is respectively connected to the main control module and the third load device, and is used to enhance the PWM signal output by the main control module and then output it to the third load device to control the working state of the third load.

[0028] In one embodiment, the 0-10V conversion circuit includes resistors R33, 34, 35, 36, 38, 39, 40, 41, capacitors C14, 15, 16, 17, transistor Q2 and operational amplifier U8;

[0029] The resistors R39, 40, 41 and the capacitors C15, 16 form a double-stage RC charge and discharge circuit, and the resistor R41 is connected to the pin 1 of the operational amplifier U8, and is used to convert the PWM signal into a DC level and then amplify it by the operational amplifier U8 into a 0-10V DC voltage for external output; one end of the resistor R33 is grounded, the other end of the resistor R33 is connected to the pin 2 of the operational amplifier U8, and is connected to one end of the resistor R35 through the resistor R34; the other end of the resistor R35 is connected to the second load device, and is connected to the power supply circuit through the resistor R31, and the other end of the resistor R35 is also grounded through the capacitor C14; the output end of the operational amplifier U8 is connected to one end of the resistor R35 through the resistor R36, the output end of the operational amplifier U8 is also connected to the base of the transistor Q2 through the resistor R38, the collector of the transistor Q2 is grounded, and the emitter of the transistor Q2 is connected to one end of the resistor R35; the power supply end of the operational amplifier U8 is connected to the power supply circuit and is grounded through the capacitor C17;

[0030] The PWM signal enhancement circuit includes a driving chip U6, a resistor R28, a resistor R29, a capacitor C12, and a diode TVS2. The pin 1 of the driving chip U6 is connected to the main control module through the resistor R28. The pin 2 of the driving chip U6 is grounded. The pin 3 of the driving chip U6 is connected to the third load device and one end of the diode TVS2 through the resistor R29. The other end of the diode TVS2 is grounded. The pin 5 of the driving chip U6 is connected to the power supply circuit and grounded through the capacitor C12.

[0031] In one embodiment, the power line communication device further includes an acceleration sensor for detecting the tipping angle of the load device;

[0032] The power supply circuit is connected to the acceleration sensor for supplying power to the acceleration sensor;

[0033] The main control module is connected to the acceleration sensor for sending an alarm signal when the tipping angle of the load device is greater than a preset threshold.

[0034] In one embodiment, the power supply circuit includes an input filtering module, a transformer, a first rectifying and filtering module, a second rectifying and filtering module, a first step-down module, a second step-down module, and a third step-down module;

[0035] The mains power line is connected to the input end of the transformer through the input filtering module. The first output end of the transformer is connected to the first step-down module through the first rectifying and filtering module. The first step-down module is respectively connected to the 485 communication circuit and the metering circuit for supplying a first power supply voltage to the 485 communication circuit and the metering circuit;

[0036] The second output end of the transformer is connected to the second step-down module through the second rectifying and filtering module. The second step-down module is connected to the main control module for supplying a second power supply voltage to the main control module;

[0037] The second output end of the transformer is also connected to the third step-down module through the second rectifying and filtering module. The third step-down module is respectively connected to the switching circuit, the 0-10V conversion circuit, and the PWM signal enhancement circuit for supplying a third power supply voltage to the switching circuit, the 0-10V conversion circuit, and the PWM signal enhancement circuit.

[0038] The above-mentioned power line communication device has the following beneficial effects:

[0039] Sharing the same line with the power supply circuit reduces the layout of communication lines and the cost of communication transmission. By transmitting signals through power lines, the intensity and quality of signal transmission are improved, and real-time detection of load devices is implemented, enhancing the degree of intelligence. In addition, it can be compatible with both 485 communication and PLC communication to achieve versatility. Description of the Drawings

[0040] Figure 1 is a schematic structural diagram of this embodiment;

[0041] Figure 2 is a schematic structural diagram of the power supply circuit in this embodiment;

[0042] Figure 3 is a schematic structural diagram of the carrier communication circuit in this embodiment;

[0043] Figure 4 is a schematic structural diagram of the connection between this embodiment and the load device. Detailed Embodiment

[0044] The following combines the drawings and embodiments to describe the present utility model in detail.

[0045] A power line carrier communication device, as Figures 1-4 shown, includes a power supply circuit, a carrier communication circuit, a 485 communication circuit, and a main control module;

[0046] The power supply circuit is connected to the mains power line for accessing alternating current and providing power to the carrier communication circuit, the 485 communication circuit, and the main control module respectively;

[0047] The carrier communication circuit is connected to the mains power line and the main control module respectively, for converting the power line carrier signal input from the mains power line into a communication signal and transmitting it to the main control module, and converting the communication signal output from the main control module into a power line carrier signal and outputting it to the mains power line, so as to realize communication between the first external device connected to the mains power line and the main control module;

[0048] The 485 communication circuit is connected to the 485 bus and the main control module respectively, for transmitting communication signals between the 485 bus and the main control module to realize communication between the second external device connected to the 485 bus and the main control module;

[0049] The main control module has an IO interface for connecting to a third external device to realize communication with the third external device.

[0050] Among them, the main control module is an MCU, and the specific model can be selected according to actual usage, and the present utility model does not limit this.

[0051] Specifically, the carrier communication circuit includes a signal coupling module, a band-pass filtering module, a carrier chip, a signal output module, and a signal protection module. One end of the signal coupling module is connected to the mains power line, and the other end of the signal coupling module is connected to the differential input end of the carrier chip through the band-pass filtering module. The differential output end of the carrier chip is connected to the other end of the signal coupling module through the signal output module. The other end of the signal coupling module is also connected to the digital voltage and ground through the signal protection module. The carrier chip is also connected to the main control module.

[0052] Further, the signal coupling module includes an isolation coupler T1 and a coupling capacitor CX1. The capacitor CX1 is connected to the mains power supply, and the isolation coupler T1 is connected to the band-pass filtering module.

[0053] The band-pass filtering module includes resistors R1, R2, R3 and coupling capacitors C1, C2, C3. The resistor R1 is connected in series with the coupling capacitor C1, and the resistor R1 is connected to the isolation coupler. The resistor R3 is connected in series with the coupling capacitor C3, and the resistor R3 is connected to the isolation coupler. The resistor R2 is connected between the coupling capacitor C1 and the coupling capacitor C3, and the coupling capacitor C2 is connected between the resistor R1 and the coupling capacitor C3.

[0054] The signal output module includes resistors R4 and R5. The resistor R4 is connected between the resistor R1 and the isolation coupler, and the resistor R5 is connected between the resistor R3 and the isolation coupler.

[0055] The signal protection module includes a first diode, a second diode, a third diode and a fourth diode. The same-name ends of the secondary winding of the isolation coupler T1 are respectively connected to the negative electrode of the first diode and the positive electrode of the second diode. The positive electrode of the first diode is grounded, and the negative electrode of the second diode is connected to the digital voltage. The different-name ends of the secondary winding of the isolation coupler T1 are respectively connected to the negative electrode of the third diode and the positive electrode of the fourth diode. The positive electrode of the third diode is grounded, and the negative electrode of the fourth diode is connected to the digital voltage.

[0056] In addition, the model of the carrier chip can be set according to actual usage requirements, such as the TCC082C chip, etc., and the present invention does not limit this.

[0057] Preferably, the power line carrier communication device further includes a metering circuit and a switching circuit.

[0058] The output end of the power supply circuit is respectively connected to the metering circuit and the switching circuit, and is used to provide power for the metering circuit and the switching circuit.

[0059] The metering circuit is connected to the main control module, and is used to generate a zero-crossing signal according to the detected mains supply voltage and output it to the main control module.

[0060] The main control module is connected to the first load device through a switch circuit, and is used to control the on / off of the switch circuit according to the zero-crossing signal, so as to control the startup and shutdown of the first load device.

[0061] Further, the metering circuit is also connected to the first load device for detecting the current of the first load device, and the main control module is also used to determine the power-off state of the first load device according to the current of the first load device;

[0062] The metering circuit is also connected to the power supply circuit for detecting the current difference at the input end of the power supply circuit, and determining the leakage state of the power line carrier communication device and the first load device according to the current difference.

[0063] Specifically, the metering module includes a current detection circuit, a leakage detection circuit and a zero-crossing signal circuit;

[0064] The current detection circuit includes capacitors C4, C6 and resistors R6, R9, R10. Resistor R6 is connected to pin 4 of metering chip U2, resistor R10 is connected to pin 3 of metering chip U2, one end of resistor R9 is connected to resistor R6 and the other end is connected to resistor R10. Capacitors C4 and C6 are in series, and one end of capacitor C4 is connected between resistor R6 and metering chip U2, and one end of capacitor C6 is connected between resistor R10 and metering chip U2;

[0065] The leakage detection circuit includes capacitors C7, C8, resistors R11, R14, R15 and current transformer CN1. One end of resistor R11 is connected to pin 6 of metering chip U2 and the other end is connected to current transformer CN1. One end of resistor R15 is connected to pin 5 of metering chip U2 and the other end is connected to current transformer CN1. One end of resistor R14 is connected between resistor R11 and current transformer CN1 and the other end is connected between resistor R15 and current transformer CN1. Capacitors C7 and C8 are in series, and one end of capacitor C7 is connected between resistor R11 and metering chip U2, and one end of capacitor C8 is connected between resistor R15 and metering chip U2;

[0066] The zero-crossing signal circuit includes capacitor C9 and resistors R18, 19, 20, 21, 22, 23. Resistors R18, 19, 20, 21, 22, 23 and pin 8 of metering chip U2 are connected in series in turn. Pin 8 of metering chip U2 is grounded. Resistor R22 is connected to pin 7 of metering chip U2. One end of capacitor C9 is connected to pin 7 of metering chip U2 and the other end is connected to pin 8 of metering chip U2.

[0067] The model of the metering chip U2 can be set according to actual use requirements. For example, the HLW8112 chip can be selected, etc. The present invention does not limit this.

[0068] Such as Figure 4As shown, the switch circuit includes a relay K1, a triode Q1, a diode D3, and a resistor R26. The main control module is connected to the base of the triode Q1 through the resistor R26. By controlling the on / off of the triode Q1, the relay K1 is controlled, and further the startup and shutdown of the first load device are controlled.

[0069] Furthermore, the power line communication device further includes at least one of a 0-10V conversion circuit and a PWM signal enhancement circuit;

[0070] The power supply circuit is respectively connected to the 0-10V conversion circuit and the PWM signal enhancement circuit for supplying power to the 0-10V conversion circuit and the PWM signal enhancement circuit;

[0071] The 0-10V conversion circuit is respectively connected to the main control module and the second load device, and is used for converting the PWM signal output by the main control module into a DC voltage signal and outputting it to the second load device to control the working state of the second load;

[0072] The PWM signal enhancement circuit is respectively connected to the main control module and the third load device, and is used for enhancing the PWM signal output by the main control module and then outputting it to the third load device to control the working state of the third load.

[0073] Preferably, the 0-10V conversion circuit includes resistors R33, 34, 35, 36, 38, 39, 40, 41, capacitors C14, 15, 16, 17, a triode Q2, and an operational amplifier U8;

[0074] Resistors R39, 40, 41 and capacitors C15, 16 form a double-stage RC charge and discharge circuit, and the resistor R41 is connected to the pin 1 of the operational amplifier U8, and is used for converting the PWM signal into a DC level and then amplifying it by the operational amplifier U8 into a 0-10V DC voltage for external output through CN4.

[0075] Preferably, the power line communication device further includes an acceleration sensor for detecting the tilting angle of the load device;

[0076] The power supply circuit is connected to the acceleration sensor for supplying power to the acceleration sensor;

[0077] The main control module is connected to the acceleration sensor for sending an alarm signal when the tilting angle of the load device is greater than a preset threshold.

[0078] Furthermore, the power supply circuit includes an input filter module, a transformer, a first rectifier filter module, a second rectifier filter module, a first buck module, a second buck module, and a third buck module;

[0079] The mains power line is connected to the input end of the transformer through the input filter module. The first output end of the transformer is connected to the first buck module through the first rectifier and filter module. The first buck module is respectively connected to the 485 communication circuit and the metering circuit, and is used to provide the first power supply voltage to the 485 communication circuit and the metering circuit.

[0080] The second output end of the transformer is connected to the second buck module through the second rectifier and filter module. The second buck module is connected to the main control module and is used to provide the second power supply voltage to the main control module.

[0081] The second output end of the transformer is also connected to the third buck module through the second rectifier and filter module. The third buck module is respectively connected to the switch circuit, the 0-10V conversion circuit and the PWM signal enhancement circuit, and is used to provide the third power supply voltage to the switch circuit, the 0-10V conversion circuit and the PWM signal enhancement circuit. Embodiment

[0082] The power metering function is as Figure 4 shown, and is implemented by the U2 chip. Among them, the network L_out is the voltage measurement input, and is divided by the resistors R18, R19, R20, R21, R22 and R23 to the 7th pin of the chip U2 to realize the detection of the power supply voltage. Among them, the high-power alloy resistor R9 is connected in series between the power input and the load. The differential detection pins 3 and 4 of the chip U2 are connected to both ends of the R9 resistor. When the load consumes power, a voltage difference will be generated at both ends of R9, and the load current can be obtained by detecting the voltage at both ends of R9;

[0083] CN1 is the current transformer interface. The zero wire and the live wire of the input power line are passed through the inner ring of the current transformer at the same time. When the line is normal, the currents flowing through the power zero wire and the live wire are just opposite and equal, and the output of the current transformer is zero. The chip differential inputs 5 and 6 detect no voltage difference, and the line is normal. When the device has a leakage phenomenon, the currents flowing through the power zero wire and the live wire are not equal. The chip differential inputs 5 and 6 can detect the voltage difference, indicating that there is a leakage phenomenon in the device or the load, and an alarm signal is output;

[0084] Among them, U1, U3, and U4 are optocouplers, which realize the isolation communication function between the metering chip and the main control MCU. The networks BL_RX and BL_TX are connected to the serial port of the main control MCU and are used to configure the metering chip and data acquisition. The network BL_ZX is the alternating current zero-crossing signal output by the metering chip. An interrupt signal will be generated when the alternating current voltage is zero. The MCU collects this signal mainly for the zero-crossing on-off control of the relay and the detection function of the mains power failure;

[0085] Among them, the U5 chip is a three-axis acceleration sensor. The sensor outputs the data of the X, Y, and Z axes and calculates through integration to obtain three groups of coordinate values of X, Y, and Z. When this device is installed on a load (such as a street lamp), when the street lamp tilts, this device tilts synchronously. The current installation attitude of the street lamp is obtained through the changes in the three groups of coordinate values of X, Y, and Z acquired by the sensor. When it is detected that the tilt angle exceeds a certain value, an alarm signal is output;

[0086] Among them, the output load terminal can be connected to devices such as lamps and household appliances. Through the functions of relays K1, power metering U2, input and output ports, etc., intelligent and remote signal acquisition and control functions for load devices can be realized. Among them, the output from the main control MCU, such as Figure 3 The network PWM signal is converted by the low-side gate driver chip U6 from the original 3.3V PWM to a 12V PWM signal with stronger driving ability and then output externally through CN2, which is suitable for docking with PWM dimming and speed regulation application products. The PWM signal output by the main control MCU passes through the double-stage RC charge and discharge circuit of R39, R40, R41, C15, and C16, converts the original PWM signal into a DC level, and then is amplified by the U8 operational amplifier to a 0 - 10V DC voltage and output externally through CN4, which is suitable for docking with power supply products for 0 - 10V dimming. The serial port of the main control MCU passes through Figure 3 U7 is converted into an external interface suitable for 485 communication, which can be used to expand external input and output devices.

[0087] For electrical appliances with a power supply voltage of AC90V - 260V, the AC mains is divided into two paths after passing through the fuse F1 and the varistor. One path passes through the "π" filter composed of L1, L2, and C10 to supply power to this device and output to the load. Using the "π" filter can effectively reduce the interference information generated during the operation of the load and affect carrier communication. The power supply is input to Figure 1 The input winding of the T2 transformer. The transformer has two output windings. Among them, the winding of pins 4 and 5 is rectified by D5, filtered by CE2 and C29, and then output as 3.3V through the U11 voltage regulator chip to supply power to the U2 metering chip.

[0088] The winding of pins 6 and 7 of the transformer is rectified by the BD1 bridge rectifier and filtered by CE1 and C21 to obtain a DC voltage of about 15V. A 3.3V DC voltage is output through the U9 DCDC conversion chip to supply power to the MCU, 485 chip, and acceleration sensor. In addition, a 12V DC voltage is output through the U10 DCDC conversion chip to supply power to the output chips U6, U8, and relays. The AC mains supplies power to the load through the on-off control of the relay.

[0089] The other path is for power line carrier communication. The carrier signal passes through the mains power line, through the capacitor CX1 and the coupling transformer, and the coupled signal enters Figure 2The input and output ports of the power line carrier communication are connected to the MCU to achieve interactive communication.

[0090] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A power line carrier communication device, characterized in that, It includes a power supply circuit, a carrier communication circuit, a 485 communication circuit and a main control module; The power supply circuit is connected to the mains power line for accessing alternating current and providing power for the carrier communication circuit, the 485 communication circuit and the main control module respectively; The carrier communication circuit is respectively connected to the mains power line and the main control module, and is used for converting the power carrier signal input by the mains power line into a communication signal and transmitting it to the main control module, and converting the communication signal output by the main control module into a power carrier signal and outputting it to the mains power line, so as to realize communication between the first external device connected to the mains power line and the main control module; The 485 communication circuit is respectively connected to the 485 bus and the main control module, and is used for transmitting communication signals between the 485 bus and the main control module to realize communication between the second external device connected to the 485 bus and the main control module; The main control module has an IO interface for connecting to a third external device to realize communication with the third external device.

2. The power line carrier communication device according to claim 1, characterized in that: The carrier communication circuit includes a signal coupling module, a band-pass filtering module, a carrier chip and a signal output module. One end of the signal coupling module is connected to the mains power line, and the other end of the signal coupling module is connected to the differential input end of the carrier chip through the band-pass filtering module. The differential output end of the carrier chip is connected to the other end of the signal coupling module through the signal output module, and the carrier chip is also connected to the main control module.

3. The power line carrier communication device according to claim 2, characterized in that: The signal coupling module consists of an isolation coupler T1 and a coupling capacitor CX1. One end of the capacitor CX1 and the opposite-named end of the primary winding of the isolation coupler T1 are respectively connected to the mains power line, and the other end of the capacitor CX1 is connected to the same-named end of the primary winding of the isolation coupler T1. The secondary winding of the isolation coupler T1 is connected to the band-pass filtering module; The band-pass filtering module includes resistors R1, R2, R3 and coupling capacitors C1, C2, C3. The same-named end of the secondary winding of the isolation coupler T1 is sequentially connected to the first differential input end of the carrier chip through the resistor R1 and the coupling capacitor C1. The opposite-named end of the secondary winding of the isolation coupler T1 is sequentially connected to the second differential input end of the carrier chip through the resistor R3 and the coupling capacitor C3. The resistor R2 is connected between the coupling capacitor C1 and the coupling capacitor C3, and the coupling capacitor C2 is connected between the resistor R1 and the coupling capacitor C3; The signal output module includes resistors R4 and R5. The same-named end of the secondary winding of the isolation coupler T1 is connected to the first differential output end of the carrier chip through the resistor R4, and the opposite-named end of the secondary winding of the isolation coupler T1 is connected to the second differential output end of the carrier chip through the resistor R5.

4. An electric power carrier communication device according to any one of claims 1 to 3, characterized in that, The power line carrier communication device further includes a metering circuit and a switching circuit; The output end of the power supply circuit is respectively connected to the metering circuit and the switching circuit for providing power for the metering circuit and the switching circuit; The metering circuit is connected to the main control module and is configured to generate a zero-crossing signal based on the detected mains supply voltage and output it to the main control module; The main control module is connected to the first load device through the switch circuit and is configured to control the on / off of the switch circuit according to the zero-crossing signal, thereby controlling the startup and shutdown of the first load device.

5. The power line carrier communication device according to claim 4, wherein: The metering circuit is also connected to the first load device and is configured to detect the current of the first load device. The main control module is also configured to determine the power-off state of the first load device according to the current of the first load device; The metering circuit is also connected to the power supply circuit and is configured to detect the current difference at the input end of the power supply circuit and determine the leakage state of the power line carrier communication device and the first load device according to the current difference.

6. An electric power carrier communication device according to claim 5, characterized in that: The metering circuit includes a metering chip U2, a current detection circuit, a leakage detection circuit, and a zero-crossing signal circuit; The current detection circuit includes capacitors C4, C6 and resistors R6, R9, R10. The resistor R6 is connected to pin 4 of the metering chip U2. The resistor R10 is connected to pin 3 of the metering chip U2. One end of the resistor R9 is connected to the resistor R6 and grounded, and the other end is connected to the resistor R10. The capacitors C4 and C6 are connected in series. One end of the capacitor C4 is connected between the resistor R6 and the metering chip U2. One end of the capacitor C6 is connected between the resistor R10 and the metering chip U2; The leakage detection circuit includes capacitors C7, C8, resistors R11, R14, R15 and a current transformer CN1. One end of the resistor R11 is connected to pin 6 of the metering chip U2 and the other end is connected to the current transformer CN1. One end of the resistor R15 is connected to pin 5 of the metering chip U2 and the other end is connected to the current transformer CN1. One end of the resistor R14 is connected between the resistor R11 and the current transformer CN1, and the other end is connected between the resistor R15 and the current transformer CN1. The capacitors C7 and C8 are connected in series. One end of the capacitor C7 is connected between the resistor R11 and the metering chip U2. One end of the capacitor C8 is connected between the resistor R15 and the metering chip U2; The zero-crossing signal circuit includes a capacitor C9 and resistors R18, 19, 20, 21, 22, 23. The resistors R18, 19, 20, 21, 22, 23 and pin 8 of the metering chip U2 are connected in series in sequence. Pin 8 of the metering chip U2 is grounded. The resistor R22 is connected to pin 7 of the metering chip U2. One end of the capacitor C9 is connected to pin 7 of the metering chip U2 and the other end is connected to pin 8 of the metering chip U2.

7. A power line carrier communication device according to claim 4, characterized in that: The power line carrier communication device further includes at least one of a 0-10V conversion circuit and a PWM signal enhancement circuit; The power supply circuit is respectively connected to the 0-10V conversion circuit and the PWM signal enhancement circuit and is configured to provide power for the 0-10V conversion circuit and the PWM signal enhancement circuit; The 0-10V conversion circuit is respectively connected to the main control module and the second load device, and is used to convert the PWM signal output by the main control module into a DC voltage signal and output it to the second load device to control the working state of the second load; The PWM signal enhancement circuit is respectively connected to the main control module and the third load device, and is used to enhance the PWM signal output by the main control module and then output it to the third load device to control the working state of the third load.

8. An electric power carrier communication device according to claim 7, characterized in that: The 0-10V conversion circuit includes resistors R33, 34, 35, 36, 38, 39, 40, 41, capacitors C14, 15, 16, 17, transistor Q2 and operational amplifier U8; The resistors R39, 40, 41 and the capacitors C15, 16 form a double-stage RC charge and discharge circuit, and the resistor R41 is connected to the 1st pin of the operational amplifier U8, and is used to convert the PWM signal into a DC level and then amplify it by the operational amplifier U8 into a 0-10V DC voltage for external output; One end of the resistor R33 is grounded, the other end of the resistor R33 is connected to the 2nd pin of the operational amplifier U8, and is connected to one end of the resistor R35 through the resistor R34; The other end of the resistor R35 is connected to the second load device, and is connected to the power supply circuit through the resistor R31, and the other end of the resistor R35 is also grounded through the capacitor C14; The output end of the operational amplifier U8 is connected to one end of the resistor R35 through the resistor R36, the output end of the operational amplifier U8 is also connected to the base of the transistor Q2 through the resistor R38, the collector of the transistor Q2 is grounded, and the emitter of the transistor Q2 is connected to one end of the resistor R35; The power supply terminal of the operational amplifier U8 is connected to the power supply circuit and is grounded through the capacitor C17; The PWM signal enhancement circuit includes a driver chip U6, a resistor R28, a resistor R29, a capacitor C12 and a diode TVS2. The 1st pin of the driver chip U6 is connected to the main control module through the resistor R28, the 2nd pin of the driver chip U6 is grounded, the 3rd pin of the driver chip U6 is connected to the third load device and one end of the diode TVS2 through the resistor R29, the other end of the diode TVS2 is grounded, the 5th pin of the driver chip U6 is connected to the power supply circuit and is grounded through the capacitor C12.

9. A power line carrier communication device according to claim 7, characterized in that: The power line communication device further includes an acceleration sensor for detecting the tilting angle of the load device; The power supply circuit is connected to the acceleration sensor for providing power to the acceleration sensor; The main control module is connected to the acceleration sensor for sending an alarm signal when the tilting angle of the load device is greater than a preset threshold.

10. A power line carrier communication device according to claim 9, characterized in that: The power supply circuit includes an input filtering module, a transformer, a first rectifying and filtering module, a second rectifying and filtering module, a first buck module, a second buck module and a third buck module; The mains power line is connected to the input end of the transformer through the input filtering module. The first output end of the transformer is connected to the first buck module through the first rectifying and filtering module. The first buck module is respectively connected to the 485 communication circuit and the metering circuit, and is used to provide a first supply voltage to the 485 communication circuit and the metering circuit; The second output end of the transformer is connected to the second buck module through the second rectifying and filtering module. The second buck module is connected to the main control module and is used to provide a second supply voltage to the main control module; The second output end of the transformer is also connected to the third buck module through the second rectifying and filtering module. The third buck module is respectively connected to the switching circuit, the 0-10V conversion circuit and the PWM signal enhancement circuit, and is used to provide a third supply voltage to the switching circuit, the 0-10V conversion circuit and the PWM signal enhancement circuit.

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