An optoelectronic conversion interface circuit and a relay communication device for relay communication in a power device

Abstract

The application discloses an optoelectronic conversion interface circuit and a relay communication device for relay communication in power equipment, relates to the technical field of relay communication, and solves the problems of software inversion occupying computing resources and insufficient driving power caused by opposite signal logic between a processor and an optoelectronic conversion chip in the prior art. Technical scheme points are as follows: the optoelectronic conversion interface circuit comprises a reverse input circuit, an optoelectronic conversion module U3 comprising an electro-optical conversion circuit and an optoelectronic conversion circuit, a reverse output circuit and a voltage stabilizing circuit, the reverse input / output circuit is connected with the electro-optical conversion / optoelectronic conversion circuit respectively, and the voltage stabilizing circuit supplies power; the relay device comprises an optical fiber and relay modules at two ends, and the relay module integrates the interface circuit and the like. The utility model realizes hardware signal reverse, saves computing resources, enhances driving capacity, and is suitable for long-distance relay communication in a power system and the like.

Description

Technical Field

[0001] This utility model belongs to the field of relay communication technology, and specifically relates to a photoelectric conversion interface circuit and a relay communication device for power equipment relay communication. Background Technology

[0002] With the construction of my country's power system, the distribution network has gradually realized distribution automation. A large number of remote distribution terminals have been installed on the lines and connected to the distribution automation master stations of local municipal bureaus. They can realize three-remote or even four-remote functions, which greatly improves the level of intelligent operation and provides a guarantee for the safe and reliable operation of the power grid. As the construction of the power grid continues to advance, urban areas have completed the construction and transformation of distribution networks and are now gradually moving towards rural areas.

[0003] In power system protection and control devices, wireless communication modules (2G / 3G / 4G / 5G mobile communication) are mostly used to achieve long-distance data transmission. The wireless communication module communicates with the distribution terminal equipment via serial ports. Because serial communication between the distribution terminal and the communication module is limited to a distance of approximately 10 meters, long-distance data transmission is not possible. Therefore, the wireless communication module can only be installed inside the distribution terminal or near the device. In such cases, even if there is no signal or a poor signal at the construction site, it is impossible to extend the serial cable to a region with good signal coverage. This is especially true in remote mountainous areas, tunnels, caves, basements, and signal-shielded locations, particularly in areas with wind power and other new energy development. Therefore, relay communication devices are needed to extend the wireless communication module to a region with good signal coverage.

[0004] Long-distance, interference-resistant, and attenuation-resistant relay communication typically uses fiber optic relay. While photoelectric conversion modules and chips are technologically mature and widely available, the signal level logic between the processor and the photoelectric conversion chip is generally reversed (i.e., when the processor outputs a high level, a low-level signal must be input to the photoelectric conversion chip to output light). The usual approach is to invert the data bits internally using a function before sending the signal. This not only consumes additional computing resources but also limits the processor's driving power, making it difficult to drive the photoelectric conversion chip effectively.

[0005] Therefore, there is a need for an optoelectronic conversion interface circuit and a relay communication device for power equipment relay communication. Utility Model Content

[0006] The purpose of this invention is to provide a photoelectric conversion interface circuit and a relay communication device for power equipment relay communication, thereby overcoming the problems of existing technologies that use software processing methods, which consume additional computing resources, have low processor drive power, and are difficult to drive photoelectric conversion chips, thus ensuring the relay communication quality and efficiency of wind power and other new energy construction equipment. The specific technical solution is as follows:

[0007] A photoelectric conversion interface circuit for relay communication in power equipment includes an inverting input circuit, a photoelectric conversion module U3, an inverting output circuit, and a voltage regulator circuit. The photoelectric conversion module U3 includes an electro-optical conversion circuit and a photoelectric conversion circuit. The electro-optical conversion circuit is connected to the inverting input circuit to convert the electrical signal input to the inverting input circuit into an optical signal and transmit it through an optical fiber. The photoelectric conversion circuit is connected to the inverting output circuit to convert the received optical signal into an electrical signal and transmit it through the inverting output circuit. The voltage regulator circuit is connected to the photoelectric conversion module U3 to provide a stable operating power supply V1 to the photoelectric conversion module U3. The inverting input circuit is connected to the operating power supply V1. The inverting output circuit is connected to the operating power supply V2.

[0008] Furthermore, the electro-optical conversion circuit has a ground terminal GNDT, an input terminal TXP, and a power supply terminal VCCT; the photoelectric conversion circuit has a ground terminal GNDR, an output terminal RXP, and a power supply terminal VCCR; the ground terminal GNDT of the electro-optical conversion circuit is grounded, the input terminal TXP is connected to the inverting input circuit, and the power supply terminal VCCT is connected to the voltage regulator circuit; the ground terminal GNDR of the photoelectric conversion circuit is grounded, the output terminal RXP is connected to the inverting output circuit, and the power supply terminal VCCR is connected to the voltage regulator circuit.

[0009] Furthermore, the inverting input circuit includes a logic inverter U4, resistors R13 and R12, and capacitor C8. The logic inverter U4 has an input terminal A, an output terminal Y, a power supply terminal VCC, and a ground terminal GND. The first end of resistor R13 is connected to the input terminal A of the logic inverter U4, serving as the electrical signal input terminal of the inverting input circuit. The second end of resistor R13 is connected to the output terminal Y of the logic inverter U4, and then connected to the first end of resistor R12. The first end of resistor R12 serves as the electrical signal output terminal of the inverting input circuit and is connected to the input terminal TXP of the electro-optical conversion circuit. The power supply terminal VCC of the logic inverter U4 is connected to the operating power supply V1. The power supply terminal VCC of the logic inverter U4 is connected to ground in series with capacitor C8. The second end of resistor R12 is connected to the operating power supply V1. The ground terminal GND of the logic inverter U4 is grounded.

[0010] Furthermore, the inverting output circuit includes a logic inverter U2, resistors R10 and R11, and capacitor C4. The logic inverter U2 has an input terminal A, an output terminal Y, a power supply terminal VCC, and a ground terminal GND. The output terminal Y of the logic inverter U2 is connected to the first end of resistor R10 and serves as the electrical signal output terminal of the inverting output circuit. The input terminal A of the logic inverter U2 is connected to the second end of resistor R10 and then to the first end of resistor R11. The second end of resistor R11 is connected to the operating power supply V2. The first end of resistor R11 serves as the electrical signal input terminal of the inverting output circuit and is connected to the output terminal RXP of the photoelectric conversion circuit. The power supply terminal VCC of the logic inverter U2 is connected to the operating power supply V2. The power supply terminal VCC of the logic inverter U2 is connected to ground after being connected in series with capacitor C4. The ground terminal GND of the logic inverter U2 is grounded.

[0011] Furthermore, the voltages of the operating power supply V1 and the operating power supply V2 are the same.

[0012] Furthermore, the voltage regulator circuit includes capacitors C5 and C7, inductors L2 and L3, capacitor C6, and capacitor C9; the first terminal of capacitor C5 is connected to the operating power supply V1 and the first terminal of inductor L2 respectively; the first terminal of capacitor C7 is connected to the first terminal of inductor L3 and then to the first terminal of inductor L2; the second terminal of capacitor C5 is connected to the second terminal of capacitor C7 and then grounded; the second terminal of inductor L2 is connected to the first terminal of capacitor C6 and then connected to the power supply terminal VCCR of the photoelectric conversion circuit; the second terminal of inductor L3 is connected to the first terminal of capacitor C9 and then connected to the power supply terminal VCCT of the electro-optical conversion circuit; the second terminal of capacitor C6 is grounded; the second terminal of capacitor C9 is grounded.

[0013] Furthermore, the capacitor C5 is a ceramic capacitor.

[0014] Furthermore, the inverting input circuit includes a resistor R26, a MOSFET M2, a resistor R28, and a capacitor C30; the first end of the resistor R26 serves as the electrical signal input terminal of the inverting input circuit, and the second end is connected to the gate of the MOSFET M2; the source of the MOSFET M2 is connected to the first end of the resistor R28; the source of the MOSFET M2 serves as the electrical signal output terminal of the inverting input circuit and is connected to the input terminal TXP of the electro-optical conversion circuit; the drain of the MOSFET M2 is grounded; the second end of the resistor R28 is connected to the operating power supply V1; and the second end of the resistor R28 is connected to the ground after being connected in series with the capacitor C30.

[0015] Furthermore, the inverting output circuit includes a resistor R25, a MOSFET M1, a resistor R27, and a capacitor C31; the first end of the resistor R25 serves as the electrical signal input terminal of the inverting output circuit and is connected to the output terminal RXP of the photoelectric conversion circuit, and the second end is connected to the gate of the MOSFET M1; the source of the MOSFET M1 is connected to the first end of the resistor R27; the source of the MOSFET M1 serves as the electrical signal output terminal of the inverting output circuit; the drain of the MOSFET M1 is grounded; the second end of the resistor R27 is connected to the operating power supply V2; and the second end of the resistor R27 is connected to the ground after being connected in series with the capacitor C31.

[0016] A relay communication device for power equipment relay communication includes an optical fiber; both ends of the optical fiber are respectively connected to a relay module; the relay module includes a level conversion circuit, a data processing circuit, a display module, a power conversion circuit, and the aforementioned photoelectric conversion interface circuit; a first end of the level conversion circuit is connected to the serial port of the device to be relayed, and a second end is connected to the data processing circuit; the data processing circuit is connected to the display module, the power conversion circuit, and the photoelectric conversion interface circuit respectively; the photoelectric conversion interface circuit is connected to the optical fiber.

[0017] Compared with existing technologies, this utility model has the following beneficial effects:

[0018] 1. Overcome the problem of consuming additional computing resources in existing technologies that require inverting data before sending it.

[0019] 2. Overcome the problem that the processor's driving power is too low and it is difficult to drive the photoelectric conversion chip.

[0020] 3. Ensure the quality of relay communication for equipment used in the construction of new energy sources such as wind power. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of the module structure of an optoelectronic conversion interface circuit for relay communication in power equipment.

[0023] Figure 2 This is a schematic diagram of the structure of the first photoelectric conversion interface circuit used for relay communication in power equipment;

[0024] Figure 3 This is a schematic diagram of the structure of a second type of photoelectric conversion interface circuit used for relay communication in power equipment;

[0025] Figure 4 This is a schematic diagram of a relay communication device used for relay communication in power equipment.

[0026] Figure 5 This is a schematic diagram of the relay module.

[0027] Figure 6 This is a schematic diagram of a level conversion circuit;

[0028] Figure 7 This is a schematic diagram of the data processing circuit. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0033] Example 1

[0034] like Figure 1 The diagram shows a schematic of a photoelectric conversion interface circuit for power equipment relay communication, including an inverting input circuit, a photoelectric conversion module U3, an inverting output circuit, and a voltage regulator circuit. The photoelectric conversion module U3 includes an electro-optical conversion circuit and a photoelectric conversion circuit. The electro-optical conversion circuit is connected to the inverting input circuit to convert the electrical signal input to the inverting input circuit into an optical signal and transmit it through an optical fiber. The photoelectric conversion circuit is connected to the inverting output circuit to convert the received optical signal into an electrical signal and transmit it through the inverting output circuit. The voltage regulator circuit is connected to the photoelectric conversion module U3 to provide a stable operating power supply V1 to the photoelectric conversion module U3. The inverting input circuit is connected to the operating power supply V1, and the inverting output circuit is connected to the operating power supply V2. By designing signal inversion hardware circuits to invert / buffer the signal between the processor and the photoelectric conversion module U3, the computational resources occupied by the processor can be reduced. Furthermore, each signal inversion hardware circuit has an independent power supply, which enhances the signal driving capability.

[0035] Furthermore, such as Figure 2 As shown, the electro-optical conversion circuit has a ground terminal GNDT, an input terminal TXP, and a power supply terminal VCCT; the photoelectric conversion circuit has a ground terminal GNDR, an output terminal RXP, and a power supply terminal VCCR; the ground terminal GNDT of the electro-optical conversion circuit is grounded, the input terminal TXP is connected to the inverting input circuit, and the power supply terminal VCCT is connected to the voltage regulator circuit; the ground terminal GNDR of the photoelectric conversion circuit is grounded, the output terminal RXP is connected to the inverting output circuit, and the power supply terminal VCCR is connected to the voltage regulator circuit. Furthermore, the photoelectric conversion module U3 can directly use commercially available chips to achieve electrical signal to optical signal conversion.

[0036] Transmitter (TXP): Receives the electrical signal converted by UART, then converts it into an optical signal, and transmits it through optical fiber.

[0037] Receiver (RXP): Receives optical signals transmitted through optical fiber, converts them into electrical signals, and sends them back to UART.

[0038] Furthermore, such as Figure 2 As shown, the inverting input circuit includes a logic inverter U4, resistors R13 and R12, and capacitor C8. The logic inverter U4 has an input terminal A, an output terminal Y, a power supply terminal VCC, and a ground terminal GND. The first end of resistor R13 is connected to the input terminal A of the logic inverter U4, serving as the electrical signal input terminal of the inverting input circuit. The second end of resistor R13 is connected to the output terminal Y of the logic inverter U4, and then connected to the first end of resistor R12. The first end of resistor R12 serves as the electrical signal output terminal of the inverting input circuit and is connected to the input terminal TXP of the electro-optical conversion circuit. The power supply terminal VCC of the logic inverter U4 is connected to the operating power supply V1. The power supply terminal VCC of the logic inverter U4 is connected to ground in series with capacitor C8. The second end of resistor R12 is connected to the operating power supply V1. The ground terminal GND of the logic inverter U4 is grounded. The specific working process is as follows:

[0039] UART5_TX (TTL level of microcontroller / serial device) → enters the A terminal of U4 → internal logic conversion (such as inversion / buffering) → output from the Y terminal → sent to the TXP terminal of the electro-optical conversion circuit → the electro-optical conversion circuit converts the electrical signal into an optical signal and transmits it through optical fiber.

[0040] Furthermore, the inverting output circuit includes a logic inverter U2, resistors R10 and R11, and capacitor C4. The logic inverter U2 has an input terminal A, an output terminal Y, a power supply terminal VCC, and a ground terminal GND. The output terminal Y of the logic inverter U2 is connected to the first end of resistor R10, serving as the electrical signal output terminal of the inverting output circuit. The input terminal A of the logic inverter U2 is connected to the second end of resistor R10, and then to the first end of resistor R11. The second end of resistor R11 is connected to the operating power supply V2. The first end of resistor R11 serves as the electrical signal input terminal of the inverting output circuit and is connected to the output terminal RXP of the photoelectric conversion circuit. The power supply terminal VCC of the logic inverter U2 is connected to the operating power supply V2. The power supply terminal VCC of the logic inverter U2 is connected to ground after being connected in series with capacitor C4. The ground terminal GND of the logic inverter U2 is grounded. The specific workflow is as follows:

[0041] Optical signal transmitted from optical fiber → received by photoelectric conversion circuit → converted into electrical signal → output through RXP terminal → enters U2's A terminal → internal logic conversion (such as inversion / buffering) → output through Y terminal → UART5_RX is sent back to microcontroller / serial port device.

[0042] U2 and U4 are single-channel logic conversion chips that reverse / buffer the TTL level signals of UART5_RX (receive) and UART5_TX (transmit) to match the level requirements of the photoelectric conversion module U3 (both are high level or both are low level). At the same time, each circuit uses an independent power supply to enhance the signal driving capability.

[0043] Furthermore, resistors R10 and R13 act as current limiters, restricting the current flowing through logic inverters U2 and U4 to prevent damage to the chips due to excessive current. They also adjust the signal driving capability, making the signal more stable during transmission.

[0044] Resistors R11 and R12 are pull-up resistors, which, together with the logic inverter, pull the logic-converted signal to a suitable level (such as the V2 and V1 voltage domains) to match the signal level with the input requirements of the photoelectric conversion module U3, ensuring correct signal recognition.

[0045] Furthermore, the voltages of the operating power supply V1 and the operating power supply V2 are the same to prevent voltage differences that could lead to signal level mismatch, additional current flow in the circuit, and noise interference. This is especially problematic during high-frequency signal transmission, as it could interfere with the UART signal, affecting signal purity and transmission quality.

[0046] Furthermore, the voltage regulator circuit includes capacitors C5 and C7, inductors L2 and L3, capacitor C6, and capacitor C9; the first terminal of capacitor C5 is connected to the operating power supply V1 and the first terminal of inductor L2 respectively; the first terminal of capacitor C7 is connected to the first terminal of inductor L3 and then to the first terminal of inductor L2; the second terminal of capacitor C5 is connected to the second terminal of capacitor C7 and then grounded; the second terminal of inductor L2 is connected to the first terminal of capacitor C6 and then connected to the power supply terminal VCCR of the photoelectric conversion circuit; the second terminal of inductor L3 is connected to the first terminal of capacitor C9 and then connected to the power supply terminal VCCT of the electro-optical conversion circuit; the second terminal of capacitor C6 is grounded; the second terminal of capacitor C9 is grounded.

[0047] Furthermore, L2 and L3 are common-mode inductors, which suppress common-mode interference from the power supply, prevent external common-mode noise from entering the circuit, and also prevent internal noise from being conducted outward, thereby improving the anti-interference capability of the photoelectric conversion module U3 and ensuring the signal conversion quality of the photoelectric conversion module U3.

[0048] Furthermore, capacitors C4, C6, C7, C8, and C9 primarily serve as high-frequency filters, removing high-frequency noise from power supply or signal lines to make the signal cleaner.

[0049] Furthermore, capacitor C5 is a ceramic capacitor, which is a polarized capacitor (marked with "+"), used to filter out low-frequency ripple in the working power supply V1 and stabilize the power supply voltage.

[0050] Example 2

[0051] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the inverting input circuit includes a resistor R26, a MOSFET M2, a resistor R28, and a capacitor C30; the first end of the resistor R26 serves as the electrical signal input terminal of the inverting input circuit, and the second end is connected to the gate of the MOSFET M2; the source of the MOSFET M2 is connected to the first end of the resistor R28; the source of the MOSFET M2 serves as the electrical signal output terminal of the inverting input circuit and is connected to the input terminal TXP of the electro-optical conversion circuit; the drain of the MOSFET M2 is grounded; the second end of the resistor R28 is connected to the operating power supply V1; and the second end of the resistor R28 is connected to the ground after being connected in series with the capacitor C30.

[0052] Furthermore, the inverting output circuit includes a resistor R25, a MOSFET M1, a resistor R27, and a capacitor C31; the first end of the resistor R25 serves as the electrical signal input terminal of the inverting output circuit and is connected to the output terminal RXP of the photoelectric conversion circuit, and the second end is connected to the gate of the MOSFET M1; the source of the MOSFET M1 is connected to the first end of the resistor R27; the source of the MOSFET M1 serves as the electrical signal output terminal of the inverting output circuit; the drain of the MOSFET M1 is grounded; the second end of the resistor R27 is connected to the operating power supply V2; and the second end of the resistor R27 is connected to the ground after being connected in series with the capacitor C31.

[0053] Signal Drive: The transmit signal output from UART5_TX is current-limited by R26, controlling the on and off states of MOSFET M2. M2 operates in switching mode, converting the V1 power supply to a level change corresponding to the UART signal. At this time, the operating power supply V1 of the inverting input circuit is consistent with that of the photoelectric conversion module U3.

[0054] Signal Conversion and Transmission: The photoelectric conversion module U3 receives the optical signal, converts it into an electrical signal, and outputs it from the RXP pin. Components such as resistor R25 then send the signal to a circuit composed of MOSFET M1. MOSFET M1 acts as a switch, adapting the signal level to the UART reception requirements, and then sends it to the subsequent processing unit via UART5_RX. At this time, the operating power supply V2 of the inverting output circuit is consistent with the operating voltage of the external processor.

[0055] In this embodiment, through clever design, not only is the signal inversion function realized and the signal driving capability enhanced, but also the compatibility of multiple levels of the working power supply V1 and V2 is realized by using MOS transistors and supporting components (that is, the voltages of V1 and V2 can be the same or different, and both can be driven in a compatible manner). For example, the processor uses the same 3.3V voltage as V2, and the working power supply V2 of the photoelectric conversion module U3 uses a 5V voltage, which can achieve compatibility between the two while ensuring the quality of signal transmission.

[0056] Example 3

[0057] like Figure 4 , Figure 5 The diagram shows a structural schematic of a relay communication device for power equipment relay communication, including an optical fiber; both ends of the optical fiber are connected to a relay module (as shown in the attached diagram). Figure 4 In this configuration, for ease of identification, the two relay modules can be named Relay Module A and Relay Module B respectively. Each relay module includes a level conversion circuit, a data processing circuit, a display module, a power conversion circuit, and the aforementioned photoelectric conversion interface circuit. The first terminal of the level conversion circuit is connected to the serial port of the device to be relayed (e.g., the level conversion circuit of Relay Module A is connected to a power distribution terminal, and the level conversion circuit of Relay Module B is connected to a wireless communication module), and the second terminal is connected to the data processing circuit. The data processing circuit is connected to the display module, the power conversion circuit, and the photoelectric conversion interface circuit, respectively. The photoelectric conversion interface circuit is connected to an optical fiber.

[0058] Furthermore, the optical fiber is a single-mode optical fiber.

[0059] Furthermore, such as Figure 6 As shown, the level conversion circuit includes a conversion chip U5, resistors R15 and R18, inductors LA1 and LB1, resistors R14 and R17; pin 11 of the conversion chip U5 is connected to the first end of resistor R15, and pin 12 is connected to the first end of resistor R18; the second ends of resistors R15 and R18 are respectively connected to the data processing circuit to output the level-converted signal; pin 14 of the conversion chip U5 is connected to the first end of inductor LA1, and pin 13 is connected to the first end of inductor LB1; the second ends of inductors LA1 and LB1 are respectively connected to the serial port of the device to be relayed, as the RS-232 interface input of the serial signal that needs to be level-converted.

[0060] Furthermore, the level conversion circuit also includes TVS diodes D2 and D3; the first terminal of TVS diode D2 is connected to the first terminal of TVS diode D3 and then grounded; the second terminal of TVS diode D2 is connected to the second terminal of inductor LA1; the second terminal of TVS diode D3 is connected to the second terminal of inductor LB1; when the RS-232 interface encounters static electricity or surge, the TVS diodes quickly conduct, clamping the overvoltage to a safe range and protecting the subsequent level conversion circuit.

[0061] Furthermore, the level conversion circuit also includes capacitors C10 and C13; the VCC pin of the conversion chip U5 is connected to the operating power supply; the VCC pin of the conversion chip U5 is connected to ground after series with capacitor C10; the VCC pin of the conversion chip U5 is connected to the V+ pin after series with capacitor C13.

[0062] Furthermore, such as Figure 7 As shown, the data processing circuit A includes a processor U1A; the processor U1A has a PC11 pin connected to the second end of a resistor R18, and a PC10 pin connected to the second end of a resistor R15 to input a serial port signal after level conversion; the processor U1A also has a PA9 pin connected to the electrical signal input terminal of an inverting input circuit, and a PA10 pin connected to the electrical signal output terminal of an inverting output circuit to output and input signals that need to be transmitted through optical fiber.

[0063] For the rest, the display module can use existing display products that can perform the same display function, and the power conversion circuit can use existing products that perform the same voltage conversion function as needed, which will not be elaborated here.

[0064] This application discloses a photoelectric conversion interface circuit and a relay communication device for power equipment relay communication, relating to the field of relay communication technology. It solves the problems in existing technologies where the signal logic between the processor and the photoelectric conversion chip is reversed, requiring software inversion which consumes computing resources and resulting in insufficient drive power. The key technical points are: the photoelectric conversion interface circuit includes an inverting input circuit, a photoelectric conversion module U3 containing electro-optical and photoelectric conversion circuits, an inverting output circuit, and a voltage regulator circuit. The inverting input / output circuits are respectively connected to the electro-optical / photoelectric conversion circuits, and the voltage regulator circuit provides power. The relay device includes an optical fiber and relay modules at both ends, with the interface circuit integrated into the relay modules. This utility model achieves hardware signal inversion, saves computing resources, enhances drive capability, and is suitable for long-distance relay communication in power systems and other applications.

[0065] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made in accordance with the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of this application and are protected by patent law.

Claims

1. An opto-electrical conversion interface circuit for relaying communication in a power device, characterized by, It includes an inverting input circuit, a photoelectric conversion module U3, an inverting output circuit, and a voltage regulator circuit; the photoelectric conversion module U3 includes an electro-optical conversion circuit and a photoelectric conversion circuit. The electro-optical conversion circuit is connected to the inverting input circuit to convert the electrical signal input to the inverting input circuit into an optical signal and transmit it through an optical fiber; the photoelectric conversion circuit is connected to the inverting output circuit to convert the received optical signal into an electrical signal and transmit it through the inverting output circuit. The voltage regulator circuit is connected to the photoelectric conversion module U3 to provide a stable operating power supply V1 to the photoelectric conversion module U3; the inverting input circuit is connected to the operating power supply V1; and the inverting output circuit is connected to the operating power supply V2.

2. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 1, characterized in that, The electro-optical conversion circuit has a ground terminal GNDT, an input terminal TXP, and a power supply terminal VCCT; the photoelectric conversion circuit has a ground terminal GNDR, an output terminal RXP, and a power supply terminal VCCR; the ground terminal GNDT of the electro-optical conversion circuit is grounded, the input terminal TXP is connected to the inverting input circuit, and the power supply terminal VCCT is connected to the voltage regulator circuit; the ground terminal GNDR of the photoelectric conversion circuit is grounded, the output terminal RXP is connected to the inverting output circuit, and the power supply terminal VCCR is connected to the voltage regulator circuit.

3. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 2, characterized in that, The inverting input circuit includes a logic inverter U4, resistors R13 and R12, and capacitor C8. The logic inverter U4 has an input terminal A, an output terminal Y, a power supply terminal VCC, and a ground terminal GND. The first end of resistor R13 is connected to the input terminal A of the logic inverter U4, serving as the electrical signal input terminal of the inverting input circuit. The second end of resistor R13 is connected to the output terminal Y of the logic inverter U4, and then connected to the first end of resistor R12. The first end of resistor R12 serves as the electrical signal output terminal of the inverting input circuit and is connected to the input terminal TXP of the electro-optical conversion circuit. The power supply terminal VCC of the logic inverter U4 is connected to the operating power supply V1. The power supply terminal VCC of the logic inverter U4 is connected to ground in series with capacitor C8. The second end of resistor R12 is connected to the operating power supply V1. The ground terminal GND of the logic inverter U4 is grounded.

4. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 2, characterized in that, The inverting output circuit includes a logic inverter U2, resistors R10 and R11, and capacitor C4. The logic inverter U2 has an input terminal A, an output terminal Y, a power supply terminal VCC, and a ground terminal GND. The output terminal Y of the logic inverter U2 is connected to the first end of resistor R10 and serves as the electrical signal output terminal of the inverting output circuit. The input terminal A of the logic inverter U2 is connected to the second end of resistor R10 and then to the first end of resistor R11. The second end of resistor R11 is connected to the operating power supply V2. The first end of resistor R11 serves as the electrical signal input terminal of the inverting output circuit and is connected to the output terminal RXP of the photoelectric conversion circuit. The power supply terminal VCC of the logic inverter U2 is connected to the operating power supply V2. The power supply terminal VCC of the logic inverter U2 is connected to ground after being connected in series with capacitor C4. The ground terminal GND of the logic inverter U2 is grounded.

5. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 1, characterized in that, The voltages of the working power supply V1 and the working power supply V2 are the same.

6. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 2, characterized in that, The voltage regulator circuit includes capacitors C5 and C7, inductors L2 and L3, capacitor C6 and capacitor C9; the first terminal of capacitor C5 is connected to the operating power supply V1 and the first terminal of inductor L2 respectively; the first terminal of capacitor C7 is connected to the first terminal of inductor L3 and then to the first terminal of inductor L2; the second terminal of capacitor C5 is connected to the second terminal of capacitor C7 and then grounded; the second terminal of inductor L2 is connected to the first terminal of capacitor C6 and then connected to the power supply terminal VCCR of the photoelectric conversion circuit; the second terminal of inductor L3 is connected to the first terminal of capacitor C9 and then connected to the power supply terminal VCCT of the electro-optical conversion circuit; the second terminal of capacitor C6 is grounded; the second terminal of capacitor C9 is grounded.

7. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 6, characterized in that, The capacitor C5 is a ceramic capacitor.

8. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 2, characterized in that, The inverting input circuit includes a resistor R26, a MOSFET M2, a resistor R28, and a capacitor C30. The first terminal of resistor R26 serves as the electrical signal input terminal of the inverting input circuit, and the second terminal is connected to the gate of MOSFET M2. The source of MOSFET M2 is connected to the first terminal of resistor R28. The source of MOSFET M2 serves as the electrical signal output terminal of the inverting input circuit and is connected to the input terminal TXP of the electro-optical conversion circuit. The drain of MOSFET M2 is grounded. The second terminal of resistor R28 is connected to the operating power supply V1. The second terminal of resistor R28 is connected to ground after being connected in series with capacitor C30.

9. The photoelectric conversion interface circuit for relay communication in power equipment according to claim 2, characterized in that, The inverting output circuit includes a resistor R25, a MOSFET M1, a resistor R27, and a capacitor C31. The first terminal of the resistor R25 serves as the electrical signal input terminal of the inverting output circuit and is connected to the output terminal RXP of the photoelectric conversion circuit. The second terminal of the resistor R25 is connected to the gate of the MOSFET M1. The source of the MOSFET M1 is connected to the first terminal of the resistor R27. The source of the MOSFET M1 serves as the electrical signal output terminal of the inverting output circuit. The drain of the MOSFET M1 is grounded. The second terminal of the resistor R27 is connected to the operating power supply V2. The second terminal of the resistor R27 is connected to the ground after being connected in series with the capacitor C31.

10. A relay communication device for relay communication in power equipment, characterized in that, The device includes an optical fiber; both ends of the optical fiber are connected to a relay module; the relay module includes a level conversion circuit, a data processing circuit, a display module, a power conversion circuit, and a photoelectric conversion interface circuit as described in any one of claims 1 to 9; the first end of the level conversion circuit is connected to the serial port of the device to be relayed, and the second end is connected to the data processing circuit; the data processing circuit is connected to the display module, the power conversion circuit, and the photoelectric conversion interface circuit respectively; the photoelectric conversion interface circuit is connected to the optical fiber.

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