Power equipment communication system

Abstract

The utility model provides a power equipment communication system, which comprises a coordinator, first power equipment and second power equipment, wherein the first power equipment and the second power equipment are connected in parallel to the output end of the coordinator; the coordinator comprises a zero signal detection circuit, a processor, a power supply output circuit and a communication signal input circuit; the zero signal detection circuit, the power supply output circuit and the communication signal input circuit are respectively connected with the processor. By adopting the scheme, two-way communication of the power equipment can be realized, the communication cost is reduced, and the communication robustness is improved.

Description

[0001] This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office on January 31, 2024, with application number 2024202486634 and application name “A Node Communication Device and Node Communication System”. Figure 2 and Figure 3 The corresponding content is incorporated into the present application by reference. Technical Field

[0002] The utility model relates to the technical field of equipment communication, in particular to a power equipment communication system. Background Art

[0003] PLC (Power Line Communication) technology is increasingly being used. When the current PLC (Power Line Communication) system communicates, it basically couples a signal of a certain frequency to the power line system through a coupler to achieve power supply and two-way communication. However, this solution requires a dedicated coupling circuit and a dedicated chip, which is costly, has high requirements for devices and technology, and is also large in size.

[0004] Therefore, a new device communication solution needs to be proposed. Summary of the invention

[0005] A technical problem to be solved by the utility model is to provide a power equipment communication system, which can realize two-way communication of the power equipment, while reducing communication costs and improving communication robustness.

[0006] The utility model provides a power equipment communication system, comprising: a coordinator, a first power equipment, and a second power equipment; wherein the first power equipment and the second power equipment are connected in parallel to the output end of the coordinator;

[0007] The coordinator comprises a zero-point signal detection circuit, a processor, a power supply output circuit and a communication signal input circuit; the zero-point signal detection circuit, the power supply output circuit and the communication signal input circuit are respectively connected to the processor.

[0008] The utility model utilizes a coordinating machine to process a mains power signal into a power supply interval and a non-power supply interval in each half cycle according to a zero-point signal. In the communication interval, a processor connects a communication signal input circuit, opens a communication channel between power equipment, and disconnects a power supply output circuit to stop the mains power supply to each power equipment. When the first and second power equipment detect a communication trigger signal and enter the communication interval after a predetermined delay, the communication channel opened by the coordinating machine is used to communicate between the power equipment. In the non-power supply interval, each power equipment is self-powered by its own energy storage. In the power supply interval, the coordinating machine closes the communication channel between the power equipment, stops communication between the power equipment, provides mains power to each power equipment, and does not communicate between the power equipment. Power supply and two-way communication on the power line are realized, and communication efficiency is high. No special devices are required, and the cost is low, and the device size is small, so reliable and low-cost communication on the power line is realized.

[0009] In one embodiment, the first power device includes: a first energy storage unit, a first signal detection circuit, a first communication unit, and a first single-chip microcomputer; the second power device includes: a second energy storage unit, a second signal detection circuit, a second communication unit, and a second single-chip microcomputer;

[0010] Among them, the first energy storage unit, the first signal detection circuit, and the first communication unit are respectively connected to the first single-chip microcomputer; the second energy storage unit, the second signal detection circuit, and the second communication unit are respectively connected to the second single-chip microcomputer.

[0011] In one embodiment, the zero-point signal detection circuit includes a first optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a capacitor; wherein the live wire is connected to one input end of the first optocoupler through the first resistor, the neutral wire is connected to the other input end of the first optocoupler through the second resistor, the circuit supply voltage is connected to the collector of the first optocoupler through the third resistor, and the zero-point detection signal is output through the collector of the first optocoupler and the fifth resistor; the emitter of the first optocoupler is grounded; the third resistor is grounded through the fourth resistor; wherein one end of the capacitor is connected to the output end of the zero-point detection signal, and the other end of the capacitor is grounded.

[0012] In one embodiment, the power supply output circuit includes a second optocoupler, a bidirectional thyristor, a bidirectional TVS tube, a sixth resistor, a seventh resistor, and an eighth resistor;

[0013] The anode input terminal of the second optocoupler is connected to the processor through the sixth resistor; one main electrode of the bidirectional thyristor is connected to the collector of the second optocoupler through the seventh resistor, and the other main electrode of the bidirectional thyristor is connected to the emitter of the second optocoupler through the eighth resistor; the control electrode of the bidirectional thyristor is connected to the emitter of the second optocoupler; and the two ends of the bidirectional TVS tube are respectively connected to the two main electrodes of the bidirectional thyristor;

[0014] The live wire signal is connected to the collector of the second optocoupler through the seventh resistor; the emitter of the second optocoupler is connected to the live wire end of the power device through the eighth resistor.

[0015] In one embodiment, the communication signal input circuit includes: a third optocoupler and a fourth optocoupler; wherein the anode of the third optocoupler and the anode of the fourth optocoupler are respectively connected to the processor; the cathode of the third optocoupler and the cathode of the fourth optocoupler are respectively grounded; the collector of the third optocoupler is connected to the non-reverse communication signal, and the collector of the fourth optocoupler is connected to the reverse communication signal;

[0016] The emitter of the third optocoupler is connected to the live wire terminal of the power equipment; the emitter of the fourth optocoupler is connected to the neutral wire terminal of the power equipment.

[0017] In one implementation, anodes of the third optocoupler and the fourth optocoupler are respectively connected to protection resistors.

[0018] In one embodiment, the first signal detection circuit includes a rectifier bridge, a voltage-stabilizing diode, a ninth resistor, a fifth optocoupler, and a tenth resistor; wherein the mains neutral line and the live line are connected to the AC input end of the rectifier bridge; the positive output end of the rectifier bridge is connected to the negative end of the voltage-stabilizing diode, the positive end of the voltage-stabilizing diode is connected to the anode end of the fifth optocoupler through the ninth resistor, and the cathode end of the fifth optocoupler is connected to the negative output end of the rectifier bridge;

[0019] The circuit power supply voltage is connected to the collector of the fifth optocoupler through the tenth resistor, and the collector of the fifth optocoupler is connected to the first single-chip computer; the emitter of the fifth optocoupler is grounded.

[0020] In one embodiment, the second signal detection circuit includes a rectifier bridge, a voltage-stabilizing diode, a ninth resistor, a fifth optocoupler, and a tenth resistor; wherein the mains neutral line and the live line are connected to the AC input end of the rectifier bridge; the positive output end of the rectifier bridge is connected to the negative end of the voltage-stabilizing diode, the positive end of the voltage-stabilizing diode is connected to the anode end of the fifth optocoupler through the ninth resistor, and the cathode end of the fifth optocoupler is connected to the negative output end of the rectifier bridge;

[0021] The circuit power supply voltage is connected to the collector of the fifth optocoupler through the tenth resistor, and the collector of the fifth optocoupler is connected to the second single-chip computer; the emitter of the fifth optocoupler is grounded.

[0022] In one embodiment, the first communication unit and the second communication unit include RS485 communication modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, a brief introduction is given below to the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of the power equipment communication system proposed by the utility model;

[0025] Figure 2 It is a structural schematic diagram of the first electric power equipment proposed by the utility model;

[0026] Figure 3 It is a structural schematic diagram of the second electric power equipment proposed by the utility model;

[0027] Figure 4 It is a schematic diagram of the communication principle of the power equipment of the utility model;

[0028] Figure 5 This is a schematic diagram of an embodiment of the zero-point signal detection circuit proposed by the utility model;

[0029] Figure 6 This is a schematic diagram of an embodiment of the power supply output circuit proposed by the utility model;

[0030] Figure 7 It is a schematic diagram of an embodiment of the communication signal input circuit proposed by the utility model;

[0031] Figure 8 It is a schematic diagram of an embodiment of the first signal detection circuit and the second signal detection circuit proposed by the utility model. DETAILED DESCRIPTION

[0032] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one or more (including two). The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0033] References to "one embodiment" or "some embodiments" etc. described in this specification mean that the specific features, structures or characteristics described in conjunction with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. The term "connected" includes direct and indirect connections, unless otherwise specified.

[0034] In the following, the terms "first", "second" are used only for descriptive purposes and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second" may explicitly or implicitly include one or more of the features.

[0035] In the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0036] The following describes in detail an electric power equipment communication system proposed by the present invention with reference to the accompanying drawings.

[0037] First, refer to Figures 1 to 3 , a power equipment communication system, comprising: a coordinator, a first power equipment, and a second power equipment; wherein the first power equipment and the second power equipment are connected in parallel to the output end of the coordinator;

[0038] The coordinator includes a zero-point signal detection circuit for detecting the zero point of the level signal of the mains, a processor, a power supply output circuit, and a communication signal input circuit; the zero-point signal detection circuit, the power supply output circuit, and the communication signal input circuit are connected to the processor respectively. The processor turns on the communication signal input circuit according to the zero point of the level signal and the duration of the non-power supply interval to open the communication channel between the power equipment; and controls the power supply output circuit to stop providing the mains; the processor is also used to turn off the communication signal input circuit according to the zero point of the level signal and the duration of the power supply interval; and controls the power supply output circuit to output the mains.

[0039] The first power device and the second power device are used to enter the communication interval after a predetermined delay when a communication trigger signal is detected, and communicate using the communication channel; wherein the communication trigger signal is obtained according to the mains voltage when entering the power supply interval; the first power device and the second power device are also used to self-power themselves in the non-power supply interval by their own energy storage.

[0040] The utility model utilizes a coordinating machine to process a mains power signal into a power supply interval and a non-power supply interval in each half cycle according to a zero-point signal. In the communication interval, a processor connects a communication signal input circuit, opens a communication channel between power equipment, and disconnects a power supply output circuit to stop the mains power supply to each power equipment. When the first and second power equipment detect a communication trigger signal and enter the communication interval after a predetermined delay, the communication channel opened by the coordinating machine is used to communicate between the power equipment. In the non-power supply interval, each power equipment is self-powered by its own energy storage. In the power supply interval, the coordinating machine closes the communication channel between the power equipment, stops communication between the power equipment, provides mains power to each power equipment, and does not communicate between the power equipment. Power supply and two-way communication on the power line are realized, and communication efficiency is high. No special devices are required, and the cost is low, and the device size is small, so reliable and low-cost communication on the power line is realized.

[0041] refer to Figure 2 The first power device includes: a first energy storage unit, a first signal detection circuit, a first communication unit, and a first single-chip microcomputer; the second power device includes: a second energy storage unit, a second signal detection circuit, a second communication unit, and a second single-chip microcomputer; wherein the first energy storage unit, the first signal detection circuit, and the first communication unit are respectively connected to the first single-chip microcomputer, and the second energy storage unit, the second signal detection circuit, and the second communication unit are respectively connected to the second single-chip microcomputer.

[0042] The first energy storage unit is used to provide electric energy to the first power equipment in the non-power supply interval; the first signal detection circuit is used to detect the communication trigger signal on the power line, and if the communication trigger signal is detected, the first single chip microcomputer controls the first communication unit to perform information communication after a predetermined delay time;

[0043] The second energy storage unit is used to provide power to the second power equipment in the non-power supply area; the second signal detection circuit is used to detect the communication trigger signal on the power line. If the communication trigger signal is detected, the second single-chip microcomputer controls the second communication unit to perform information communication after a predetermined delay time.

[0044] refer to Figure 5The zero-point signal detection circuit includes a first optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a capacitor; wherein the live wire is connected to an input end (pin 1) of the first optocoupler through the first resistor, the neutral wire is connected to another input end (pin 2) of the first optocoupler through the second resistor, the circuit power supply voltage (such as 3.3V) is connected to the collector (pin 3) of the first optocoupler through the third resistor, and the zero-point detection signal is output through the collector of the first optocoupler and the fifth resistor; the emitter (pin 4) of the first optocoupler is grounded; the third resistor is grounded through the fourth resistor; wherein one end of the capacitor (C1) is connected to the output end of the zero-point detection signal, and the other end of the capacitor is grounded.

[0045] In one embodiment, a schematic diagram of an embodiment of a power supply output circuit is shown in FIG. Figure 6 , including a second optocoupler, a bidirectional thyristor, a bidirectional TVS tube, a sixth resistor, a seventh resistor, and an eighth resistor;

[0046] The anode (pin 1) input terminal of the second optocoupler is connected to the processor through the sixth resistor; one main electrode of the bidirectional thyristor is connected to the collector (pin 3) of the second optocoupler through the seventh resistor, and the other main electrode of the bidirectional thyristor is connected to the emitter (pin 4) of the second optocoupler through the eighth resistor; the control electrode of the bidirectional thyristor is connected to the emitter (pin 4) of the second optocoupler; the two ends of the bidirectional TVS tube are respectively connected to the two main electrodes of the bidirectional thyristor; transient voltage suppressor (TVS) diode.

[0047] The collector (pin 3) of the second optocoupler is connected to the live wire signal through the seventh resistor; the emitter (pin 4) of the second optocoupler is connected to the live wire end of the power device (including the first and second power devices) through the eighth resistor.

[0048] In one embodiment, a schematic diagram of an embodiment of a communication signal input circuit, referring to Figure 7 , including: a third optocoupler and a fourth optocoupler; wherein the anode (pin 1) of the third optocoupler and the anode (pin 1) of the fourth optocoupler are respectively connected to the processor; the cathode (pin 2) of the third optocoupler and the cathode (pin 2) of the fourth optocoupler are respectively grounded; the collector (pin 3) of the third optocoupler is connected to the non-inverting communication signal, and the collector (pin 3) of the fourth optocoupler is connected to the inverting communication signal. When in the communication section, the coordinator opens the communication signal input circuit and receives the differential signals sent by the power equipment: non-inverting communication signal (non-inverting) and inverting communication signal (inverting).

[0049] In some implementations, the anode (pin 1) of the third optocoupler and the anode (pin 1) of the fourth optocoupler are respectively connected to the processor via protection resistors.

[0050] The emitter (pin 4) of the third optocoupler is connected to the live wire terminal of the power equipment; the emitter (pin 4) of the fourth optocoupler is connected to the neutral wire terminal of the power equipment.

[0051] In one embodiment, a schematic diagram of an embodiment of a first signal detection circuit is shown in FIG. Figure 8 , including a rectifier bridge, a voltage-stabilizing diode, a ninth resistor, a fifth optocoupler, and a tenth resistor; wherein the mains neutral line and the live line are connected to the AC input end of the rectifier bridge; the positive output end of the rectifier bridge is connected to the negative end of the voltage-stabilizing diode, the positive end of the voltage-stabilizing diode is connected to the anode end of the fifth optocoupler through the ninth resistor, and the cathode end of the fifth optocoupler is connected to the negative output end of the rectifier bridge;

[0052] The circuit power supply voltage is connected to the collector of the fifth optocoupler through the tenth resistor, and the collector of the fifth optocoupler is connected to the first single-chip computer; the emitter of the fifth optocoupler is grounded.

[0053] In one embodiment, a schematic diagram of an embodiment of a second signal detection circuit is shown in FIG. Figure 8 , including a rectifier bridge, a voltage-stabilizing diode, a ninth resistor, a fifth optocoupler, and a tenth resistor; wherein the mains neutral line and the live line are connected to the AC input terminal (AC pin) of the rectifier bridge; the positive output terminal of the rectifier bridge is connected to the negative terminal of the voltage-stabilizing diode, the positive terminal of the voltage-stabilizing diode is connected to the anode terminal (pin 1) of the fifth optocoupler through the ninth resistor, and the cathode terminal (pin 2) of the fifth optocoupler is connected to the negative output terminal of the rectifier bridge;

[0054] The circuit supply voltage is connected to the collector (pin 3) of the fifth optocoupler through the tenth resistor, and the collector of the fifth optocoupler is connected to the second single-chip microcomputer for transmitting the communication trigger signal to the second single-chip microcomputer; the emitter (pin 4) of the fifth optocoupler is grounded.

[0055] In one embodiment, the coordinator further processes the non-power supply interval into a front protection interval, a communication interval, and a rear protection interval; wherein the front protection interval, the communication interval, and the rear protection interval are adjacent in sequence; in the front and rear protection intervals, the mains power supply to each power device is stopped, and the communication channel between the power devices is closed. Based on this solution, the reliability of communication can be improved.

[0056] In one embodiment, when the non-power supply interval includes only the communication interval, the predetermined time is the preset power supply interval duration;

[0057] When the non-power supply interval includes a front protection interval, a communication interval, and a rear protection interval; the predetermined time is the sum of the power supply interval length and the front protection interval length.

[0058] In one embodiment, the first communication unit and the second communication unit include RS485 communication modules.

[0059] The principle of using the utility model to communicate with power equipment is shown in Figure 1. Figure 4 , taking a period T of the AC power signal as an example, from the time axis 0 to 1 / 2T, the coordinator processes the AC power signal into a non-power supply interval (0~t3) and a power supply interval (t3~1 / 2T). The non-power supply interval (0~t3) includes the front protection interval (0~t1), the communication interval (t1~t2), and the rear protection interval (t2~t3); from the time axis 1 / 2T position to T, the AC power signal is processed into a non-power supply interval (1 / 2T~t7) and a power supply interval (t7~T). The non-power supply interval (1 / 2T~t7) includes the front protection interval (1 / 2T~t5), the communication interval (t5~t6), and the rear protection interval (t6~t7);

[0060] When in the power supply interval, the coordinator closes the communication channel between the power equipment and outputs the mains power supply signal voltage. When the power supply signal voltage is detected at the power equipment terminal, a high level is output (i.e., the communication trigger signal is detected). Figure 5 , the level corresponding to t3 to t4 (it can be understood that the duration of the high-level identification output, such as t3~t4, t7~t8, is related to the specific detection circuit). At this time, the power equipment terminal enters the communication interval after a predetermined time, that is, the duration of t5-t3. In the communication interval, the coordinator opens the communication channel between the power equipment and stops the mains power supply to each power equipment; the power equipment uses the communication channel opened by the coordinator to communicate between the power equipment. At this time, the power equipment uses its own energy storage for self-powered communication. The communication voltage (the self-powered voltage of the power equipment) is lower than the mains voltage, so as to facilitate the identification of what kind of signal the detected signal is. After the communication is completed, it passes through the post-protection interval and enters the power supply area. In this cycle, power supply and two-way communication on the power line are realized.

[0061] It is understandable that in the built-in program of the power equipment, it is necessary to pre-synchronize with the coordinator the mechanism for processing the AC power signal into non-power supply intervals and power supply intervals to obtain the start and end times of the front protection interval, communication interval, rear protection interval, and power supply interval.

[0062] The electrical equipment mentioned in this plan should be understood in a broad sense.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A power equipment communication system, characterized in that: include: A coordinator, a first power device, and a second power device; wherein the first power device and the second power device are connected in parallel to the output end of the coordinator; The coordinator comprises a zero-point signal detection circuit, a processor, a power supply output circuit and a communication signal input circuit; the zero-point signal detection circuit, the power supply output circuit and the communication signal input circuit are respectively connected to the processor.

2. The power equipment communication system according to claim 1, characterized in that: The first power device includes: a first energy storage unit, a first signal detection circuit, a first communication unit, and a first single-chip microcomputer; the second power device includes: a second energy storage unit, a second signal detection circuit, a second communication unit, and a second single-chip microcomputer; Among them, the first energy storage unit, the first signal detection circuit, and the first communication unit are respectively connected to the first single-chip microcomputer; the second energy storage unit, the second signal detection circuit, and the second communication unit are respectively connected to the second single-chip microcomputer.

3. The power equipment communication system according to claim 1, characterized in that: The zero-point signal detection circuit includes a first optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a capacitor; wherein, the live wire is connected to one input end of the first optocoupler through the first resistor, the neutral wire is connected to the other input end of the first optocoupler through the second resistor, the circuit power supply voltage is connected to the collector of the first optocoupler through the third resistor, and the zero-point detection signal is output to the processor through the collector of the first optocoupler and the fifth resistor; the emitter of the first optocoupler is grounded; the third resistor is grounded through the fourth resistor; wherein, one end of the capacitor is connected to the output end of the zero-point detection signal, and the other end of the capacitor is grounded.

4. The power equipment communication system according to claim 1, characterized in that: The power supply output circuit includes a second optical coupler, a bidirectional thyristor, a bidirectional TVS tube, a sixth resistor, a seventh resistor, and an eighth resistor; The anode input terminal of the second optocoupler is connected to the processor through the sixth resistor; one main electrode of the bidirectional thyristor is connected to the collector of the second optocoupler through the seventh resistor, and the other main electrode of the bidirectional thyristor is connected to the emitter of the second optocoupler through the eighth resistor; the control electrode of the bidirectional thyristor is connected to the emitter of the second optocoupler; and the two ends of the bidirectional TVS tube are respectively connected to the two main electrodes of the bidirectional thyristor; The live wire signal is connected to the collector of the second optocoupler through the seventh resistor; the emitter of the second optocoupler is connected to the live wire end of the power device through the eighth resistor.

5. The power equipment communication system according to claim 1, characterized in that: The communication signal input circuit includes: a third optocoupler and a fourth optocoupler; wherein the anode of the third optocoupler and the anode of the fourth optocoupler are respectively connected to the processor; the cathode of the third optocoupler and the cathode of the fourth optocoupler are respectively grounded; the collector of the third optocoupler is connected to the non-reverse communication signal of the power device, and the collector of the fourth optocoupler is connected to the reverse communication signal of the power device; The emitter of the third optocoupler is connected to the live wire terminal of the power equipment; the emitter of the fourth optocoupler is connected to the neutral wire terminal of the power equipment.

6. The power equipment communication system according to claim 1, characterized in that: Anodes of the third optical coupler and the fourth optical coupler are respectively connected to protection resistors.

7. The power equipment communication system according to claim 2, characterized in that: The first signal detection circuit includes a rectifier bridge, a voltage-stabilizing diode, a ninth resistor, a fifth optocoupler, and a tenth resistor; wherein the mains neutral line and the live line are connected to the AC input end of the rectifier bridge; the positive output end of the rectifier bridge is connected to the negative end of the voltage-stabilizing diode, the positive end of the voltage-stabilizing diode is connected to the anode end of the fifth optocoupler through the ninth resistor, and the cathode end of the fifth optocoupler is connected to the negative output end of the rectifier bridge; The circuit power supply voltage is connected to the collector of the fifth optocoupler through the tenth resistor, and the collector of the fifth optocoupler is connected to the first single-chip computer; the emitter of the fifth optocoupler is grounded.

8. The power equipment communication system according to claim 2, characterized in that: The second signal detection circuit includes a rectifier bridge, a voltage-stabilizing diode, a ninth resistor, a fifth optical coupler, and a tenth resistor; wherein the mains neutral line and the live line are connected to the AC input end of the rectifier bridge; the positive output end of the rectifier bridge is connected to the negative end of the voltage-stabilizing diode, the positive end of the voltage-stabilizing diode is connected to the anode end of the fifth optical coupler through the ninth resistor, and the cathode end of the fifth optical coupler is connected to the negative output end of the rectifier bridge; The circuit power supply voltage is connected to the collector of the fifth optocoupler through the tenth resistor, and the collector of the fifth optocoupler is connected to the second single-chip computer; the emitter of the fifth optocoupler is grounded.

9. The power equipment communication system according to any one of claims 2 to 8, characterized in that: The first communication unit and the second communication unit include RS485 communication modules.

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