Carrier communication circuit

Abstract

The utility model provides a carrier communication circuit, and relates to the technical field of carrier communication, the carrier communication circuit comprises a strong current circuit, a weak current circuit, an optocoupler, a signal transformer and a power supply circuit, the output end of the strong current circuit is in communication connection with the input end of the optocoupler, and the output end of the optocoupler is in communication connection with the input end of the weak current circuit; the input end of the signal transformer is in communication connection with the output end of the weak current circuit and the output end of the strong current circuit, the output end of the signal transformer is in communication connection with the input end of the strong current circuit and the output end of the weak current circuit, and the power supply circuit is electrically connected with the strong current circuit, the weak current circuit, the optocoupler and the signal transformer. Electrical isolation between the strong current circuit and the weak current circuit is achieved through the optocoupler, potential threats caused by high voltage and large current in the strong current circuit to the weak current circuit are effectively reduced, and safety is improved.

Description

Technical Field

[0001] This application relates to the technical field of carrier communication, and in particular to a carrier communication circuit. Background Technology

[0002] Due to the complex structure of the power grid, aging lines, and the lack of unified standards and specifications, power grid lines are prone to generating various electromagnetic interferences and noises while transmitting power signals. These interferences and noises not only affect the stability and security of the power grid but also have a significant impact on the normal operation of carrier communication modules.

[0003] Carrier communication technology is a technology that uses power lines as a communication medium, transmitting information by loading high-frequency signals onto the power lines. In a power system, high-voltage circuits typically refer to circuits with high voltage and high current, while low-voltage circuits refer to circuits with low voltage and low current. A significant potential difference and current variation exist between the two; direct connection between them could lead to equipment damage or personal injury. Therefore, an effective isolation mechanism is needed in carrier communication circuits to safely isolate high-voltage and low-voltage circuits. Utility Model Content

[0004] In order to achieve safe isolation between strong and weak currents, this application provides a carrier communication circuit.

[0005] This application provides a carrier communication circuit, which adopts the following technical solution:

[0006] A carrier communication circuit includes: a high-voltage circuit, a low-voltage circuit, an optocoupler, a signal transformer, and a power supply circuit. The output terminal of the high-voltage circuit is communicatively connected to the input terminal of the optocoupler, the output terminal of the optocoupler is communicatively connected to the input terminal of the low-voltage circuit, the input terminal of the signal transformer is communicatively connected to the output terminals of both the low-voltage circuit and the high-voltage circuit, and the output terminal of the signal transformer is communicatively connected to the input terminals of both the high-voltage circuit and the low-voltage circuit. The power supply circuit is electrically connected to the high-voltage circuit, the low-voltage circuit, the optocoupler, and the signal transformer.

[0007] The high-voltage circuit includes: a high-voltage interface terminal and a high-voltage carrier signal processing circuit. The input terminal of the high-voltage carrier signal processing circuit is communicatively connected to the output terminal of the high-voltage interface terminal and the output terminal of the signal transformer, respectively. The output terminal of the high-voltage interface terminal is communicatively connected to the input terminal of the optocoupler. The output terminal of the high-voltage carrier signal processing circuit is communicatively connected to the input terminal of the signal transformer and the input terminal of the high-voltage interface terminal.

[0008] The low-voltage circuit includes: a low-voltage interface terminal, a main control system circuit, and a low-voltage carrier signal processing circuit. The input terminal of the main control system circuit is communicatively connected to the output terminal of the low-voltage interface terminal, the output terminal of the low-voltage carrier signal processing circuit, and the output terminal of the optocoupler, respectively. The output terminal of the main control system circuit is communicatively connected to the input terminal of the low-voltage interface terminal and the input terminal of the low-voltage carrier signal processing circuit, respectively. The input terminal of the low-voltage carrier signal processing circuit is also communicatively connected to the output terminal of the signal transformer, and the output terminal of the low-voltage carrier signal processing circuit is also communicatively connected to the input terminal of the signal transformer.

[0009] By adopting the above technical solutions, this application employs key components such as optocouplers and signal transformers. During carrier communication, it effectively suppresses interference and noise in the power grid lines. This application achieves electrical isolation between high-voltage and low-voltage circuits through optocouplers. An optocoupler is an electronic component that uses optical signals for transmission. It can transmit electrical signals from one circuit to another without direct contact, effectively reducing the potential threat posed by high voltage and high current in high-voltage circuits to low-voltage circuits and improving system safety. The signal transformer plays a role in signal transmission and transformation in this system. It can amplify or reduce signals in low-voltage circuits to meet the transmission requirements of high-voltage circuits. The signal transformer can also suppress interference signals in the line to a certain extent, improving signal transmission quality. The high-voltage interface terminal serves as the interface with external high-voltage equipment or lines, responsible for introducing external high-voltage signals into the system. The high-voltage carrier signal processing circuit is responsible for processing the carrier signal received from the high-voltage interface terminal, including signal amplification, filtering, modulation, and demodulation, ensuring that the carrier signal maintains a high signal-to-noise ratio and anti-interference capability during transmission, thereby improving communication quality. The other end of the high-voltage carrier signal processing circuit is communicatively connected to one end of the signal transformer. The signal transformer plays a role in signal transmission and transformation within the carrier communication circuit. Through the signal transformer, the signal output from the high-voltage carrier signal processing circuit can be amplified or reduced to meet the requirements of the external transmission line. The low-voltage interface terminal serves as the interface with external low-voltage equipment or lines, responsible for introducing external low-voltage signals into the circuit. The signal output from the signal transformer, after being processed by the low-voltage carrier signal processing circuit, is input to the main control system for processing and control, achieving intelligent management and control of the entire low-voltage circuit and improving reliability and stability. The low-voltage carrier signal processing circuit is also responsible for processing the carrier signal received from the main control system circuit, realizing bidirectional transmission of the carrier signal.

[0010] Optionally, the high-voltage circuit also includes: a zero-crossing detection circuit, the input of which is connected to the output of the high-voltage interface terminal, and the output of which is communicatively connected to the input of the optocoupler.

[0011] Zero-crossing detection circuits are used to detect the zero-crossing points of the mains voltage, that is, the instant when the voltage changes from positive to negative or vice versa. This is because carrier signals typically need to be transmitted near the zero point of the mains voltage to reduce interference and losses to the grid. Zero-crossing detection circuits can accurately determine the timing of carrier signal transmission, improving communication efficiency and stability.

[0012] Optionally, the low-voltage circuit also includes an LED indicator circuit, the input of which is connected to the output of the main control system circuit.

[0013] By adopting the above technical solution, the LED indicator circuit can display the working status of the low-voltage circuit. By sending control signals to the LED indicator circuit through the main control system circuit, the working status of the low-voltage circuit, such as power supply status and signal transmission status, can be monitored in real time.

[0014] Optionally, the zero-crossing detection circuit includes: a zero-crossing detection chip and a first resistor. The input terminal of the zero-crossing detection chip is communicatively connected to the output terminal of the high-voltage interface terminal, and the output terminal of the zero-crossing detection chip is communicatively connected to the input terminal of the optocoupler via the first resistor.

[0015] By adopting the above technical solution, a first resistor is connected between the output terminal of the zero-crossing detection chip and the input terminal of the optocoupler, which plays a role in current limiting protection. Since the signal output by the zero-crossing detection chip has a high voltage or current, directly connecting it to the optocoupler will cause damage or performance degradation to the optocoupler. By connecting the first resistor in series, the current flowing through the optocoupler can be limited, protecting the optocoupler and enabling it to work normally.

[0016] Optionally, the high-voltage carrier signal processing circuit includes: a high-voltage carrier signal processing chip, a second resistor, and a third resistor. The input terminal of the high-voltage carrier signal processing chip is communicatively connected to the output terminal of the high-voltage interface terminal. The output terminal of the high-voltage carrier signal processing chip is communicatively connected to the input terminal of the signal transformer through the second resistor. The output terminal of the high-voltage carrier signal processing chip is communicatively connected to the input terminal of the signal transformer through the third resistor.

[0017] By employing the above technical solution, a second resistor and a third resistor are respectively configured between the output terminal of the high-voltage carrier signal processing chip and the input terminal of the signal transformer. This limits the current flowing through the signal transformer, reducing the risk of equipment damage due to excessive current. The resistors, in conjunction with the signal transformer, can suppress high-frequency noise and interference signals to a certain extent, improving the signal-to-noise ratio. The two output terminals of the high-voltage carrier signal processing chip are connected to the two input terminals of the signal transformer via resistors, enabling bidirectional signal transmission.

[0018] Optionally, the main control system circuit includes a main control chip and peripheral circuits. The output of the optocoupler is communicatively connected to the input of the main control chip, and the output of the main control chip is communicatively connected to the input of the LED indicator circuit and the input of the weak current carrier signal processing circuit.

[0019] By adopting the above technical solution, the output of the optocoupler is communicatively connected to the input of the main control chip, achieving electrical isolation between strong and weak currents. This not only protects the main control chip from interference and damage from strong current signals but also improves safety and stability. The output of the main control chip is communicatively connected to the input of the LED indicator circuit, enabling real-time monitoring of the operating status. Through the on / off state of the LED indicator, users can intuitively understand the circuit's operating status, such as power supply status and signal transmission status. The output of the main control chip is also communicatively connected to the input of the weak current carrier signal processing circuit, enabling precise control of the weak current carrier signal. Through the instructions of the main control chip, the weak current carrier signal processing circuit can amplify, filter, demodulate, and perform other processing on the received signal, improving signal quality and stability.

[0020] Optionally, the input terminal of the main control chip can be communicatively connected to the output terminal of the low-voltage interface terminal.

[0021] By adopting the above technical solution, the direct connection between the main control chip and the low-voltage interface terminal helps to reduce signal processing delay, improve circuit response speed, and meet real-time requirements.

[0022] Optionally, the carrier communication circuit further includes a voltage acquisition circuit, one end of which is connected to the power supply circuit, and the other end of which is communicatively connected to the input terminal of the main control system circuit.

[0023] By adopting the above technical solution, since different electronic devices and systems have different voltage requirements, the presence of the voltage acquisition circuit allows this circuit to flexibly adapt to different power supply voltage inputs, enabling the main control system circuit to operate within a safe voltage range. Through the regulation of the power supply voltage by the voltage acquisition circuit, the required operating voltage can be stably provided to the main control system circuit, helping to reduce circuit failures caused by voltage fluctuations or instability, and improving the overall stability and reliability of the circuit.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. This application employs key components such as optocouplers and signal transformers, which can effectively suppress interference and noise in power grid lines during carrier communication. The signal transformer in this application plays a role in signal transmission and transformation; it can amplify or reduce signals in weak current circuits to meet the transmission requirements of strong current circuits. The signal transformer can also suppress interference signals in the line to a certain extent, improving the signal transmission quality.

[0026] 2. This application achieves electrical isolation between high-voltage and low-voltage circuits through optocouplers. An optocoupler is an electronic component that uses optical signals for transmission. It can transmit electrical signals from one circuit to another without direct contact, effectively reducing the potential threat posed by high voltage and high current in high-voltage circuits to low-voltage circuits and improving safety. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of signal transmission in this application;

[0028] Figure 2 This is the circuit schematic of the zero-crossing detection circuit of this application;

[0029] Figure 3 This is the circuit schematic diagram of the optocoupler circuit of this application;

[0030] Figure 4 This is a circuit schematic diagram of the weak current carrier signal processing circuit - transmission circuit section of this application;

[0031] Figure 5 This is a circuit schematic diagram of the receiving circuit section of the weak current carrier signal processing circuit in this application;

[0032] Figure 6 This is the circuit schematic of the main control chip in this application;

[0033] Figure 7 This is the circuit schematic diagram of the LED indicator circuit of this application;

[0034] Figure 8 This is the circuit schematic diagram of the low-voltage interface terminal of this application;

[0035] Figure 9 This is a circuit diagram of the signal transformer and high-voltage carrier signal processing circuit of this application;

[0036] Figure 10 This is the circuit schematic of the voltage acquisition circuit of this application;

[0037] Figure 11 This is the circuit schematic diagram of the power supply circuit of this application;

[0038] Figure 12 This is the circuit schematic diagram of the high-voltage interface terminal of this application.

[0039] Explanation of reference numerals in the attached diagram: First resistor - R62; Second resistor - R12; Third resistor - R30. Detailed Implementation

[0040] The following combination Figures 1 to 12 This application will be described in further detail.

[0041] Reference Figure 1 This embodiment discloses a carrier communication circuit, including: a high-voltage circuit, a low-voltage circuit, an optocoupler, a signal transformer, and a power supply circuit, achieving efficient and stable signal transmission and processing. The structure and connection method of this embodiment are described below:

[0042] The high-voltage circuit section includes: a high-voltage interface terminal, a zero-crossing detection circuit, and a high-voltage carrier signal processing circuit. The high-voltage interface terminal serves as the signal input, with one end connected to the high-voltage carrier signal processing circuit and the other end connected to the input of the zero-crossing detection circuit. The zero-crossing detection circuit accurately captures the moment of voltage zero and transmits this crucial information to the input of the optocoupler through its output. The high-voltage carrier signal processing circuit is responsible for transmitting the processed high-voltage carrier signal to one end of the signal transformer, laying the foundation for further signal transmission and conversion.

[0043] The low-voltage circuit section includes low-voltage interface terminals, a main control system circuit, a low-voltage carrier signal processing circuit, and an LED indicator circuit. The input terminal of the main control system circuit not only seamlessly connects to the output terminal of the optocoupler but also establishes communication connections with one end of the low-voltage interface terminals, one end of the low-voltage carrier signal processing circuit, and the input terminal of the LED indicator circuit. This design not only accurately transmits signals but also enables real-time monitoring and indication of the carrier communication circuit's status. The low-voltage carrier signal processing circuit is responsible for receiving and processing the carrier signal from the signal transformer, further enhancing the communication performance of this circuit.

[0044] The signal transformer serves as a bridge connecting high-voltage and low-voltage circuits. Its two ends are connected to the high-voltage carrier signal processing circuit and the low-voltage carrier signal processing circuit, respectively, thus realizing stable signal transmission and conversion.

[0045] The power supply circuit provides power to the low-voltage circuit, optocoupler, and signal transformer, enabling the entire carrier communication circuit to operate stably.

[0046] Reference Figure 2The zero-crossing detection circuit includes a zero-crossing detection chip and a first resistor R62. The zero-crossing detection chip is a GS1102 chip. The zero-crossing detection circuit collects the signal output from the high-voltage interface terminal, processes the signal, and then transmits the processed signal to the main control system circuit of the low-voltage circuit through an optocoupler to realize the zero-crossing detection of the AC line. Its connection method is as follows:

[0047] The VSS pin of the zero-crossing detection chip is connected to the A7 pin of the high-voltage interface terminal. The VSS pin of the zero-crossing detection chip is connected to the first pin of the optocoupler via capacitor C79. The IN pin of the zero-crossing detection chip is connected to the A1 pin of the high-voltage interface terminal via resistors R75, R76, R33, and R34. The VDD pin of the zero-crossing detection chip is connected to the first pin of the optocoupler via first resistor R62. The VDD pin of the zero-crossing detection chip is also connected to the second pin of the optocoupler.

[0048] Reference Figure 3 The optocoupler uses an LTV-816S-D3-TX chip, and its connection method is as follows:

[0049] The third pin of the LTV-816S-D3-TX chip is connected to one end of resistor R77, one end of capacitor C13, and the ADC_CH1 pin of the main control system circuit. The other end of resistor R77 is grounded, and the other end of capacitor C13 is grounded. The fourth pin of the LTV-816S-D3-TX chip is connected to one end of capacitor C77, one end of capacitor C9, and the OUTD pin of the power supply circuit. The other end of capacitor C77 is grounded, and the other end of capacitor C9 is grounded.

[0050] Reference Figure 4 The connection method of the transmitting part of the weak current carrier signal processing circuit includes: a weak current carrier signal processing chip, a second resistor R12, and a third resistor R30. The weak current carrier signal processing chip is a THS6212IRHFR chip. The connection method of the weak current carrier signal processing circuit is as follows:

[0051] The D1_IN+ pin of the weak current carrier signal processing chip is connected to the TXP pin of the main control system circuit via resistor R401, resistor R68, and capacitor C76. The D1_IN- pin of the weak current carrier signal processing chip is connected to the TXN pin of the main control system circuit via resistor R402, resistor R78, and capacitor C75. The D1_FB pin of the weak current carrier signal processing chip is connected to the D2_FB pin of the weak current carrier signal processing chip via resistor R37 and capacitor C31. The D1_FB pin of the weak current carrier signal processing chip is connected to the weak current carrier signal... The D1_OUT pin of the processing chip is connected, the D2_FB pin of the weak carrier signal processing chip is connected to the D2_OUT pin of the weak carrier signal processing chip via resistor R3, the BIAS-1 pin of the weak carrier signal processing chip is connected to the BIAS-2 pin of the weak carrier signal processing chip via capacitor R7, the IADJ pin of the weak carrier signal processing chip is grounded via resistor R5, the VS+ pin of the weak carrier signal processing chip is connected to the VCLAMP pin of the power supply circuit via resistor R22, and the VS-, EP, and VS- pins of the weak carrier signal processing chip are all grounded;

[0052] The D1_OUT pin of the weak current carrier signal processing chip is connected to the third pin of the signal transformer via the second resistor R12. The D2_OUT pin of the weak current carrier signal processing chip is connected to the fourth pin of the signal transformer via the third resistor R30. The end of the second resistor R12 away from the D1_OUT pin is connected to one end of the capacitor C403, and the other end of the capacitor C403 is grounded. The end of the third resistor R30 away from the D2_OUT pin is connected to one end of the capacitor C402, and the other end of the capacitor C402 is grounded.

[0053] Reference Figure 5The connection method of the receiving circuit section of the weak current carrier processing circuit includes: one end of resistor R1 in the receiving circuit section is connected to the third pin of the signal transformer; the other end of resistor R1 in the receiving circuit section is grounded through resistor R38; the other end of resistor R1 in the receiving circuit section is connected to one end of capacitor C16; the other end of capacitor C16 is connected to one end of inductor L4 and one end of capacitor C41 respectively; the other end of capacitor C41 in the receiving circuit section is connected to one end of resistor R26 and one end of inductor L5; the other end of inductor L5 in the receiving circuit section is connected to one end of capacitor C8, one end of resistor R23, and one end of capacitor C1 respectively; the other end of capacitor C1 in the receiving circuit section... The capacitor C2 in the receiving circuit of the weak current carrier processing circuit is connected to the RXP pin of the main control system chip. One end of the capacitor C2 in the receiving circuit of the weak current carrier processing circuit is connected to the other end of the resistor R23, the other end of the capacitor C8, and one end of the inductor L6. The other end of the inductor L6 in the receiving circuit of the weak current carrier processing circuit is connected to the other end of the resistor R26 and one end of the capacitor C40. The other end of the capacitor C40 in the receiving circuit of the weak current carrier processing circuit is connected to the other end of the inductor L4 and one end of the capacitor C38. The other end of the capacitor C38 in the receiving circuit of the weak current carrier processing circuit is grounded through the resistor R42. The other end of the capacitor C38 in the receiving circuit of the weak current carrier processing circuit is also connected to the fourth pin of the signal transformer through the resistor R2.

[0054] Reference Figure 6 The main control system circuit includes a main control chip D31TV100 and its peripheral circuits. The output terminal of the optocoupler is communicatively connected to the input terminal of the main control chip. The output terminal of the main control chip is communicatively connected to the input terminal of the LED indicator circuit and the input terminal of the weak current carrier signal processing circuit. One end of the main control chip is communicatively connected to the weak current interface terminal. The connection method of the main control system circuit is as follows:

[0055] The ADC_CH1 pin of the main control chip is grounded via capacitor C60; the RSTN pin is grounded via capacitor C42; the GPIO_0 pin is grounded via capacitor C605; the GPIO_0 pin is connected to the LDRVR_PD of the carrier signal transmission circuit; the TRX_SW pin is grounded via resistor R46; the TRX_SW pin is connected to the RF interface of the RF antenna; the GPIO_20 pin is connected to the UART1_RXD pin; the GPIO_11 pin is connected to the RX0_TTL of the low-voltage interface terminal; and the GPIO_23 pin is grounded via resistor R46. R41 is grounded. The GPIO_19 pin of the main control chip is connected to the UART1_TXD pin of the main control chip. The SPI0_CSN pin of the main control chip is connected to the STA_TTL terminal of the low-voltage interface. The SPI0_CK pin of the main control chip is grounded through resistor R43. The UART1_TXD pin of the main control chip is also grounded through resistor R44. The UART3_RXD pin of the main control circuit system is connected to one end of resistor R96 of the LED indicator circuit. The UART3_TXD pin of the main control chip is connected to one end of resistor R97 of the LED indicator circuit. The GPIO_7 pin of the main control chip is connected to the VDET3_I2V0 pin of the voltage acquisition circuit.

[0056] The GND67, GND68, GND69, and GND70 pins of the main control chip are all grounded. The DVDD33_1 and DVDD33_2 pins of the main control chip are connected to ground via capacitor C25. The VDD11_RO pin of the main control chip is grounded via capacitor C54. The VDD12_RI pin of the main control chip is connected to the AVDD12_RI pin. The VDD12_RI pin is connected to one end of capacitors C606, C607, C30, and C55, and one end of inductor LB3. The other ends of capacitors C606, C607, C30, and C55 are grounded. The other end of inductor LB3 is connected to the BUCK_IV25 pin of the main control chip. The AVDD33_PI_1 and AVDD33_P pins of the main control chip are grounded. The I_2 and VDD3_RI pins are connected. The AVDD33_PI_1 pin of the main control chip is also connected to one end of capacitor C39, one end of capacitor C29, and one end of inductor LB5. The other ends of capacitors C39 and C29 are grounded. The other end of inductor LB5 is connected to the OUTD pin of the power supply circuit. The GND_RF_1, GND_RF_2, GND_RF_3, GND_RF_4, GND_RF_5, GND_RF_7, and GND_RF_8 pins of the main control chip are all grounded. The AVDD12_AI pin of the main control chip is connected to one end of inductor LB18 and one end of capacitor C459. The other end of capacitor C459 is grounded. The AVDD12_AO pin of the main control chip is connected to the other end of inductor LB18 and one end of capacitor C602. The other end of capacitor C602 is grounded.

[0057] The AVDD25_RO pin of the main control chip is grounded through capacitor C47. The AVDD33_1 pin of the main control chip is connected to one end of inductor LB8, one end of capacitor C36, and one end of capacitor C80. The other end of inductor LB8 is connected to the OUTD pin of the power supply circuit. The other ends of capacitors C36 and C80 are both grounded. The GND64, GND65, and GND66 pins of the main control chip are all grounded. The PVDD33_BUCK pin of the main control chip is connected to the AVDD33_BUCK pin and then grounded through capacitor C65. Capacitor C28 is connected in parallel with capacitor C65. The BUCK_LX pin of the main control chip is grounded through capacitor C63. Capacitor C64 is connected in parallel with capacitor C63. The BUCK_IV25 pin of the main control chip is connected to the other end of inductor LB3. The VDD_DIG pin of the main control chip is grounded through capacitor C48. The BUCK_GND_1 pin of the main control chip... The main control chip's R_EXT pin, BUCK_GND_2 pin, BUCK_GND_3 pin, BUCK_GND_4 pin, and GND71 pin are all grounded. The main control chip's VREF pin is grounded through resistor R17. The main control chip's VREF pin is grounded through capacitor C52. Capacitor C24 is connected in parallel with capacitor C52. The main control chip's RXN pin is connected to the other end of capacitor C2 in the receiving circuit of the weak electric carrier signal processing circuit. The main control chip's RXP pin is connected to the other end of capacitor C1 in the receiving circuit of the weak electric carrier signal processing circuit. The main control chip's AVDD33_2 pin is connected to one end of capacitor C62, one end of capacitor C34, and one end of inductor LB2. The other end of inductor LB2 is connected to the OUTD pin of the power supply circuit. The other ends of capacitor C62 and capacitor C34 are grounded. The main control chip's AVDD28_AO pin is connected to one end of capacitor C66. The other end of capacitor C66 is grounded.

[0058] Reference Figure 7 The LED indicator circuit is connected as follows:

[0059] The other end of R96 in the LED indicator circuit is connected to one end of capacitor C78 and the positive terminal of diode D9. The other end of capacitor C78 is connected to the negative terminal of diode D9 and then grounded. The other end of R97 in the LED indicator circuit is connected to one end of capacitor C53 and the positive terminal of diode D5. The other end of capacitor C53 is connected to the negative terminal of diode D5 and then grounded.

[0060] Reference Figure 8 The connection method of the low-voltage interface terminal is as follows:

[0061] The A1 pin of the low-voltage interface terminal is connected to the OUTD pin of the power supply circuit. The A2 pin of the low-voltage interface terminal is grounded. The A4 pin of the low-voltage interface terminal is connected to the UART1_RXD pin of the main control system circuit. The A4 pin of the low-voltage interface terminal is also grounded through capacitor C58. The A4 pin of the low-voltage interface terminal is also connected to the OUTD pin of the power supply circuit through resistor R29. The A5 pin of the low-voltage interface terminal is connected to the UART1_TXD pin of the main control system circuit. The A5 pin of the low-voltage interface terminal is also grounded through capacitor C14.

[0062] Reference Figure 9 The signal transformer is an ETA16200 transformer, and its connection method is as follows: the first pin of the ETA16200 transformer is grounded through a reserved resistor R502, and the second pin of the ETA16200 transformer is grounded through a reserved resistor R501; the third and fourth pins of the ETA16200 transformer are connected to the weak current carrier signal circuit after being connected in parallel with ESD diodes; the fifth and eighth pins of the ETA16200 transformer are connected to the strong current carrier signal processing circuit.

[0063] The connection method of the high-voltage carrier signal processing circuit is as follows:

[0064] One end of capacitor C11 in the high-voltage carrier signal processing circuit is connected to pin A2 of the high-voltage interface terminal, and the other end of capacitor C11 in the high-voltage carrier signal processing circuit is connected to the positive terminal of Zener diode D3. The positive terminal of Zener diode D3 in the high-voltage carrier signal processing circuit is also connected to the fifth pin of the signal transformer. The positive terminal of Zener diode D2 in the high-voltage carrier signal processing circuit is connected to pin A8 of the high-voltage interface terminal, and the positive terminal of Zener diode D2 in the high-voltage carrier signal processing circuit is also connected to the eighth pin of the signal transformer.

[0065] Reference Figure 10 The voltage acquisition circuit is connected as follows:

[0066] One end of resistor R36 in the voltage acquisition circuit is connected to the I2V0 pin of the power supply circuit. The other end of resistor R36 in the voltage acquisition circuit is connected to one end of resistor R39 and one end of capacitor C56. The other end of resistor R39 is connected to the other end of capacitor C56 and then grounded. The connection between the other end of resistor R36 and one end of resistor R39 is also connected to the negative terminal of Zener diode D1 and the positive terminal of Zener diode D2. The positive terminal of Zener diode D1 is grounded, and the negative terminal of Zener diode D2 is connected to the DVDD33 pin of the power supply circuit.

[0067] Reference Figure 11 The power supply circuit uses the RY1352A power management chip, and its connection method is as follows:

[0068] The SWU pin of the power management chip is connected to the SCAP pin of the power management chip via inductor L9. The SWU pin of the power management chip is connected to the anode of diode D15. The cathode of diode D15 is connected to the cathode of diode D17 and the VSYS pin of the power management chip. The VSYS pin of the power management chip is grounded via capacitor C103 and capacitor C20. The VIN pin of the power management chip is connected to the anode of diode D17 via resistor R301 and is also grounded via capacitor C303. The VCLAMP pin of the power management chip is connected to the cathode of diode D17 via resistor R22 and is grounded via resistor R87. The EN pin of the power management chip is connected to the positive terminal of diode D17 via resistor R88. The EN pin of the power management chip is grounded via resistor R92. The SCAP pin of the power management chip is grounded via resistor R53. The SCAP pin of the power management chip is also grounded via capacitor C92. The OUTD pin of the power management chip is grounded via capacitor C72. Capacitors C302, C72, and C91 are connected in parallel. The BSTU pin of the power management chip is connected to the SWU pin of the power management chip via capacitor C301. The BSTD pin of the power management chip is grounded via capacitor C22, resistor R59, inductor L7, and capacitor C302 in sequence. The SWD pin of the power management chip is grounded via inductor L7 and capacitor C302 in sequence. The GND pin of the inductor L7 and capacitor C302 is grounded.

[0069] Reference Figure 12 The connection method of the high-voltage interface terminal is as follows:

[0070] The A7 pin of the high-voltage interface terminal is connected to the VSS pin of the zero-crossing detection chip and the input pin of the high-voltage carrier processing circuit, respectively. The A1 pin of the high-voltage interface terminal is connected to the IN pin of the zero-crossing detection chip and one end of the capacitor C11 of the high-voltage carrier processing circuit, respectively.

[0071] The working principle of this embodiment is as follows: The zero-crossing detection circuit collects the signal from the high-voltage interface terminal, processes the signal, and transmits it to the main control system circuit in the low-voltage circuit through an optocoupler to realize zero-crossing detection of the AC line; After the carrier input signal enters the high-voltage interface terminal, it passes through the high-voltage carrier signal processing circuit and the signal transformer in sequence to be converted into a low-voltage signal. The low-voltage signal is received by the low-voltage carrier signal processing circuit, and after processing, it enters the main control system circuit; The main control system circuit processes the low-voltage signal and outputs a carrier output signal. The carrier output signal is amplified by the low-voltage carrier signal processing circuit, passes through the signal transformer and the high-voltage carrier signal processing circuit in sequence, and is output to the high-voltage interface terminal; The LED indicator circuit receives the control signal from the main control system circuit to realize LED display; The main control system circuit interacts bidirectionally with the external meter board through the low-voltage interface terminal.

[0072] This application includes an optocoupler, a signal transformer, a high-voltage circuit, and a low-voltage circuit, which can effectively suppress interference and noise in the power grid line during carrier communication. The signal transformer plays a role in signal transmission and transformation. It can amplify or reduce the signal in the low-voltage circuit to meet the transmission requirements of the high-voltage circuit. The signal transformer can also suppress interference signals in the line to a certain extent and improve the signal transmission quality.

[0073] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A carrier communication circuit, characterized in that, include: The circuit consists of a high-voltage circuit, a low-voltage circuit, an optocoupler, a signal transformer, and a power supply circuit. The output of the high-voltage circuit is connected to the input of the optocoupler, and the output of the optocoupler is connected to the input of the low-voltage circuit. The input of the signal transformer is connected to the outputs of both the low-voltage and high-voltage circuits, and the output of the signal transformer is connected to the inputs of both the high-voltage and low-voltage circuits. The power supply circuit is electrically connected to the high-voltage circuit, the low-voltage circuit, the optocoupler, and the signal transformer. The high-voltage circuit includes: a high-voltage interface terminal and a high-voltage carrier signal processing circuit. The input terminal of the high-voltage carrier signal processing circuit is communicatively connected to the output terminal of the high-voltage interface terminal and the output terminal of the signal transformer, respectively. The output terminal of the high-voltage interface terminal is communicatively connected to the input terminal of the optocoupler. The output terminal of the high-voltage carrier signal processing circuit is communicatively connected to the input terminal of the signal transformer and the input terminal of the high-voltage interface terminal. The low-voltage circuit includes: a low-voltage interface terminal, a main control system circuit, and a low-voltage carrier signal processing circuit. The input terminal of the main control system circuit is communicatively connected to the output terminal of the low-voltage interface terminal, the output terminal of the low-voltage carrier signal processing circuit, and the output terminal of the optocoupler, respectively. The output terminal of the main control system circuit is communicatively connected to the input terminal of the low-voltage interface terminal and the input terminal of the low-voltage carrier signal processing circuit, respectively. The input terminal of the low-voltage carrier signal processing circuit is also communicatively connected to the output terminal of the signal transformer, and the output terminal of the low-voltage carrier signal processing circuit is also communicatively connected to the input terminal of the signal transformer.

2. The carrier communication circuit according to claim 1, characterized in that, The high-voltage circuit also includes: a zero-crossing detection circuit, the input of which is connected to the output of the high-voltage interface terminal, and the output of which is communicatively connected to the input of the optocoupler.

3. The carrier communication circuit according to claim 2, characterized in that, The low-voltage circuit also includes an LED indicator circuit, the input of which is connected to the output of the main control system circuit.

4. The carrier communication circuit according to claim 3, characterized in that, The zero-crossing detection circuit includes a zero-crossing detection chip and a first resistor. The input terminal of the zero-crossing detection chip is communicatively connected to the output terminal of the high-voltage interface terminal, and the output terminal of the zero-crossing detection chip is communicatively connected to the input terminal of the optocoupler via the first resistor.

5. The carrier communication circuit according to claim 4, characterized in that, The high-voltage carrier signal processing circuit includes: a high-voltage carrier signal processing chip, a second resistor, and a third resistor. The input terminal of the high-voltage carrier signal processing chip is communicatively connected to the output terminal of the high-voltage interface terminal. The output terminal of the high-voltage carrier signal processing chip is communicatively connected to the input terminal of the signal transformer through the second resistor. The output terminal of the high-voltage carrier signal processing chip is communicatively connected to the input terminal of the signal transformer through the third resistor.

6. The carrier communication circuit according to claim 5, characterized in that, The main control system circuit includes a main control chip and peripheral circuits. The output of the optocoupler is connected to the input of the main control chip. The output of the main control chip is connected to the input of the LED indicator circuit and the input of the weak current carrier signal processing circuit.

7. The carrier communication circuit according to claim 6, characterized in that, The input terminal of the main control chip is connected to the output terminal of the low-voltage interface terminal for communication.

8. The carrier communication circuit according to any one of claims 3-7, characterized in that, The carrier communication circuit also includes a voltage acquisition circuit, the input of which is connected to the output of the power supply circuit, and the output of which is communicatively connected to the input of the main control system circuit.

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