Detection circuit, dry node communication system and detection method

Abstract

The invention provides a detection circuit, a dry node communication system and a detection method, the detection circuit is applied to the dry node communication system, the dry node communication system comprises a sender, a receiver and a transmission link, the sender is provided with a dry node and a detection circuit, the detection circuit comprises a sending detection circuit, a transmission detection circuit and a controller, the sending detection circuit and the transmission detection circuit are both connected with the dry node; the sending detection circuit is used for controlling the dry node to be opened or closed according to an instruction of the controller and outputting a corresponding sending detection signal; the transmission detection circuit is used for outputting a transmission detection signal of a transmission link when the dry node is disconnected; the controller is used for determining whether the sender has a fault according to the sending detection signal; and determining whether the transmission link has a fault according to the transmission detection signal. According to the invention, the fault position in the dry node communication system can be accurately determined through the sending detection circuit and the transmission detection circuit.

Description

Technical Field

[0001] This invention relates to the field of communication technology, specifically to a detection circuit, a dry node communication system, and a detection method. Background Technology

[0002] A dry node communication system refers to a system that uses dry nodes as signal sources and transmits the status (open or closed) information of the dry nodes to a remote receiving device through a transmission link.

[0003] However, in real-world scenarios, the signal lines of dry node communication systems are often buried in conduits within walls. Once a communication failure occurs, troubleshooting can take a significant amount of time, resulting in low efficiency in fault detection for dry node communication systems. Summary of the Invention

[0004] In view of this, embodiments of the present invention aim to provide a detection circuit, a dry node communication system, and a detection method to solve the problem of low anomaly detection efficiency in the prior art for dry node communication systems.

[0005] The present invention provides a detection circuit for use in a dry node communication system. The dry node communication system includes a transmitter, a receiver, and a transmission link. The transmitter is provided with a dry node and the detection circuit. The detection circuit includes a transmission detection circuit, a transmission detection circuit, and a controller. The transmission detection circuit and the transmission detection circuit are both connected to the dry node.

[0006] The transmission detection circuit is used to control the dry node to open or close according to the instructions of the controller, and output the corresponding transmission detection signal;

[0007] The transmission detection circuit is used to output a transmission detection signal of the transmission link when the dry node is disconnected;

[0008] The controller is used to determine whether the sender is faulty based on the transmission detection signal; and to determine whether the transmission link is faulty based on the transmission detection signal.

[0009] In some embodiments, when the controller sends a first control command and receives a first detection signal sent by the transmission detection circuit, and when the controller sends a second control command and receives a second detection signal sent by the transmission detection circuit, it is determined that the transmitter is not faulty.

[0010] In some embodiments, the transmission detection circuit includes a multiplexer switch, the multiplexer switch including a first contact and a second contact connected to each other;

[0011] When the controller sends the first control command, the first contact and the second contact are respectively connected to the corresponding contact of the dry node;

[0012] When the controller sends the second control command, the first and second contacts disconnect from the dry node and connect to the output terminal that sends the detection signal.

[0013] In some embodiments, when the controller sends the second control command, the first contact is connected to the first power supply terminal through a pull-up resistor and outputs the transmission detection signal; the second contact is grounded.

[0014] In some embodiments, the multiplexer is a relay, and the relay includes a first switch, a second switch, and an inductor;

[0015] The fixed end of the first switch is connected to the first contact, and the movable end of the first switch is used to connect to the third or fourth contact under the drive of the inductor.

[0016] The fixed end of the second switch is connected to the second contact, and the movable end of the second switch is used to connect to the fifth or sixth contact under the drive of the inductor; the third and fifth contacts are connected to the transmission link; the fourth contact outputs the transmission detection signal, and the sixth contact is grounded;

[0017] The inductor is connected to the controller and is used to receive the first control command or the second control command, and drive the first switch and the second switch to perform corresponding actions according to the first control command or the second control command.

[0018] In some embodiments, the transmission detection circuit includes: an acquisition amplification circuit and an isolation conversion circuit;

[0019] The acquisition and amplification circuit is connected to the transmission link and is used to acquire and amplify the voltage difference of the transmission link when the dry node is disconnected.

[0020] The isolation conversion circuit is connected to the acquisition amplification circuit and the controller respectively, and is used to convert the amplified voltage difference into a corresponding transmission detection signal and output it to the controller.

[0021] In some embodiments, when the amplified voltage difference is within a specified voltage difference range, the isolation conversion circuit outputs a transmission detection signal at a preset level, and the controller determines that there is no fault in the transmission link based on the transmission detection signal.

[0022] Another aspect of the present invention provides a dry node communication system, the dry node communication system comprising a transmitter, a receiver and a transmission link, wherein the transmitter is provided with a dry node and a detection circuit as described in any one of claims 1 to 7.

[0023] In another aspect, the present invention provides a detection method applied to the controller in the above embodiments, the method comprising:

[0024] Send a command to the transmission detection circuit to control the dry node to open or close, and receive the corresponding transmission detection signal; when the dry node is open, receive the transmission detection signal sent by the transmission detection circuit;

[0025] The sender is determined to have a fault based on the transmission detection signal; and the transmission link is determined to have a fault based on the transmission detection signal.

[0026] In one embodiment, the method further includes:

[0027] If it is determined that the dry node communication system is faulty, and neither the sender nor the transmission link is faulty, then it is determined that the receiver is faulty.

[0028] Compared with related technologies, the detection circuit provided by the present invention has the following advantages:

[0029] The detection circuit provided by this invention includes a transmission detection circuit, a transmission detection circuit, and a controller. Both the transmission detection circuit and the transmission detection circuit are connected to the trunk node. The transmission detection circuit controls the trunk node to open or close according to the controller's instructions and outputs a corresponding transmission detection signal. The transmission detection circuit outputs a transmission link detection signal when the trunk node is open. The controller determines whether a fault exists on the sender based on the transmission detection signal and whether a fault exists on the transmission link based on the transmission detection signal. In other words, the controller can automatically receive the transmission detection signal output by the transmission detection circuit and the transmission detection signal output by the transmission detection circuit, and use this to determine whether the fault in the trunk node communication system occurs on the sender or on the transmission link. This allows for accurate and rapid location of the fault, eliminating the tedious manual troubleshooting of faults in the trunk node communication system and improving the efficiency of anomaly detection in the trunk node communication system. Attached Figure Description

[0030] Figure 1 The diagram shown is a schematic diagram of a dry node communication system provided in an embodiment of the present invention.

[0031] Figure 2 The diagram shown is a schematic diagram of a dry node communication system provided in another embodiment of the present invention.

[0032] Figure 3 The diagram shown is a schematic diagram of the transmission detection circuit provided in an embodiment of the present invention.

[0033] Figure 4 The diagram shown is a schematic diagram of the transmission detection circuit provided in another embodiment of the present invention.

[0034] Figure 5 The diagram shown is a schematic diagram of the transmission detection circuit provided in an embodiment of the present invention.

[0035] Figure 6 The diagram shows a connection diagram of a first power supply and a second power supply according to an embodiment of the present invention.

[0036] Figure 7 The diagram shown is a connection diagram of the second power supply and the fourth power supply provided in an embodiment of the present invention.

[0037] Figure 8 The diagram shown is a connection diagram of the third power supply and the fourth power supply provided in an embodiment of the present invention.

[0038] Figure 9 The diagram shown is a flowchart of a detection method provided in an embodiment of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Currently, dry-node communication systems are widely used in various fields. For example, in photovoltaic-thermal integrated systems, it is necessary to store the surplus power generated by photovoltaic equipment, which is crucial for improving the utilization rate of photovoltaic power. The heat pump control module can establish a dry-node communication system with the heat pump to achieve communication and change the heat pump's operating mode based on the surplus photovoltaic power provided by the inverter, thereby improving the utilization rate of photovoltaic power.

[0041] The heat pump's operating mode is adjusted by inputting a dry node signal. In practical scenarios, the heat pump control module can act as the sender in the dry node communication system, and the heat pump can act as the receiver. The communication link between the heat pump control module and the heat pump can be achieved through a dry node signal line. However, the dry node signal line is usually buried in a pipe in the wall. Once the dry node communication system between the heat pump control module and the heat pump fails, troubleshooting will take a lot of time and is not easy to operate.

[0042] For example, such as Figure 1 As shown, a dry node communication system can typically be divided into three parts: the sender, the transmission link, and the receiver. The sender may have dry nodes, and the transmission link can transmit signals through the state of the dry nodes (such as closed and open states). When a communication failure occurs, it is necessary to quickly locate which of the three parts the fault occurs in.

[0043] In view of the above problems, one embodiment of the present invention provides a detection circuit that can be applied to the aforementioned dry node communication system, such as... Figure 2 As shown, the dry node communication system may include a transmitter 10, a receiver 30 and a transmission link 20. The transmitter 10 is provided with a dry node 11 and a detection circuit 12. The detection circuit 12 includes a transmission detection circuit 123, a transmission detection circuit 121 and a controller 122. The transmission detection circuit 123 and the transmission detection circuit 121 are both connected to the dry node 11.

[0044] The transmitting detection circuit 123 is used to control the dry node 11 to open or close according to the instructions of the controller 122, and output the corresponding transmitting detection signal;

[0045] The transmission detection circuit 121 is used to output a transmission detection signal of the transmission link when the dry node 11 is disconnected.

[0046] The controller 122 is used to determine whether there is a fault in the sender based on the transmission detection signal; and to determine whether there is a fault in the transmission link based on the transmission detection signal.

[0047] For example, in practical applications, the first end of the transmission link can be connected to the detection circuit, and the second end of the transmission link 20 can be connected to the load. The first end of the dry node communication system can be used to connect to the sender, and the second end of the dry node communication system can be used to connect to the receiver.

[0048] The sender has a dry node 11 with two ports (hereinafter also referred to as contacts), namely the first port n1 and the second port n2. The dry node 11 can be connected to the transmission link 20 through the first port n1 and the second port n2. The sending detection circuit 123 and the transmission detection circuit 121 can both be connected to the dry node 11 through the first port n1 and the second port n2.

[0049] In some implementations, the control command may include a first control command and a second control command, and the detection signal may include a first detection signal matching the first control command and a second detection signal matching the second control command. For example, the first control command may be used to control the trunk node 11 to open, and the first detection signal may indicate that the trunk node 11 is in an open state. The first control command may also be used to control the trunk node 11 to close, and the first detection signal may indicate that the trunk node 11 is in a closed state.

[0050] In this embodiment, the controller 122 can determine whether the transmitter is faulty by detecting whether the detection signal output by the transmission detection circuit 123 matches the command control.

[0051] As an example, when controller 122 sends a first control command to trunk node 11 and receives a first detection signal from transmission detection circuit 123; and when controller 122 sends a second control command to trunk node 11 and receives a second detection signal from transmission detection circuit 123, it is determined that the transmitter is not faulty. Thus, controller 122 can detect whether trunk node 11 of the transmitter is responding normally to control commands to quickly determine whether the transmitter is faulty.

[0052] In some implementations, the transmission detection circuit 121 can output a transmission detection signal of the transmission link 20 when the trunk node 11 is disconnected. The transmission detection signal can be obtained by the transmission detection circuit 121 detecting the voltage difference of the transmission link 20 (such as the difference between the voltage of the first port n1 and the voltage of the second port n2). Since there is generally a voltage difference between the two ends of the trunk node 11 when it is disconnected, and the voltage difference is usually within a certain voltage difference range, the transmission detection circuit 121 detects the voltage difference of the transmission link 20 to obtain the transmission detection signal, and then the controller 122 determines whether the voltage difference is within the specified voltage difference range based on the transmission detection signal. This can accurately determine whether the transmission link 20 has a fault, thereby reducing the difficulty of fault detection of the transmission link 20 and improving the efficiency of fault detection of the transmission link 20.

[0053] As can be seen, in this embodiment, the detection circuit includes a transmitting detection circuit 123, a transmission detection circuit 121, and a controller 122. Both the transmitting detection circuit 123 and the transmission detection circuit 121 are connected to the trunk node 11. The transmitting detection circuit 123 controls the trunk node 11 to open or close according to the instructions of the controller 122 and outputs a corresponding transmitting detection signal. The transmission detection circuit 121 outputs a transmission detection signal for the transmission link 20 when the trunk node 11 is open. The controller 122 determines whether a fault exists on the sender based on the transmitting detection signal and whether a fault exists on the transmission link 20 based on the transmission detection signal. In other words, the controller 122 can automatically receive the transmitting detection signal output by the transmitting detection circuit and the transmission detection signal output by the transmission detection circuit 121, and use this to determine whether the fault in the trunk node communication system occurs on the sender or on the transmission link 20. This allows for accurate and rapid location of the fault, eliminating the tedious manual troubleshooting of faults in the trunk node communication system and improving the efficiency of anomaly detection in the trunk node communication system.

[0054] In some implementations, such as Figure 3 As shown, the transmission detection circuit 121 may include: a data acquisition and amplification circuit 1211 and an isolation and conversion circuit 1212.

[0055] The acquisition and amplification circuit 1211 is connected to the transmission link 20 and is used to acquire and amplify the voltage difference of the transmission link 20 when the dry node 11 is disconnected.

[0056] The isolation conversion circuit 1212 is connected to the acquisition amplifier circuit 1211 and the controller 122 respectively, and is used to convert the amplified voltage difference into the corresponding transmission detection signal and output it to the controller 122.

[0057] In this embodiment, the voltage difference of the transmission link 20 is acquired and amplified by the acquisition amplification circuit 1211, so that even a small change in the voltage difference of the transmission link 20 can be clearly detected by the transmission detection circuit 121. In addition, the amplified voltage difference is isolated and converted into a corresponding transmission detection signal by the isolation conversion circuit 1212, thereby obtaining a stable and accurate transmission detection signal and preventing high voltage or noise input to the controller 122, protecting the sensitive controller 122 from damage.

[0058] In some implementations, when the amplified voltage difference is within a specified voltage difference range, the isolation conversion circuit 1212 outputs a transmission detection signal at a preset level, and the controller 122 determines that there is no fault in the transmission link 20 based on the transmission detection signal.

[0059] For example, the preset level can be low. The amplified voltage difference is voltage difference U0. If voltage difference U0 is within a specified voltage difference range, a low-level transmission detection signal can be generated. If voltage difference U0 is not within the specified voltage difference range, a high-level transmission detection signal can be generated. When the controller 122 receives a low-level transmission detection signal, it can determine that there is no fault in the transmission link 20. When the controller 122 receives a high-level transmission detection signal, it can determine that there is a fault in the transmission link 20.

[0060] Understandably, the specified voltage difference range can be set according to actual needs. Optionally, this specified voltage difference range can be determined based on historical voltage differences collected under normal operating conditions of the transmission link 20. For example, when the receiver is a heat pump, the detected voltage difference of the transmission link 20 is typically in the range of 5V to 24V. Therefore, when the receiver is the aforementioned heat pump, the specified voltage difference range can be set to 5V to 24V.

[0061] In some implementations, such as Figure 4 As shown, the acquisition amplifier circuit 1211 may include: a differential operational amplifier D2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.

[0062] The first end of the first resistor R1 is connected to the first end of the trunk node 11 of the trunk node communication system 420, and is used to receive the first voltage U1 of the first port n1 of the trunk node 11. The second end of the first resistor R1 is connected to the first end of the third resistor R3 and the first input end of the differential operational amplifier D2, respectively.

[0063] The first end of the second resistor R2 is connected to the second end n2 of the trunk node 11 of the trunk node communication system, and is used to receive the second voltage U2 of the second port n2 of the trunk node 11. The second end of the second resistor R2 is connected to the first end of the fourth resistor R4 and the second input end of the differential operational amplifier D2, respectively.

[0064] The output of the differential operational amplifier D2 is connected to the second terminal of the isolation conversion circuit 1212 and the fourth resistor R4, respectively.

[0065] The second terminal of the third resistor R3 is grounded.

[0066] In practical applications, the differential operational amplifier D2 is connected to a third power supply (P12V0_2). The first input terminal of the differential operational amplifier D2 is the positive input terminal, and the second input terminal of the differential operational amplifier D2 (hereinafter referred to as the operational amplifier) ​​is the negative input terminal. Therefore, the voltages at the positive input terminal, negative input terminal, and output terminal of the differential operational amplifier D2 can be expressed as U, respectively. + U ― U OBased on the "virtual open" characteristic of operational amplifiers, we can conclude that:

[0067] Based on the "virtual short" characteristic of operational amplifiers, we can conclude that: U + =U ― .

[0068] In this embodiment, for ease of calculation, the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are R1, R2, R3, and R4, respectively, where R1 = R2 and R3 = R4.

[0069] Therefore, it can be determined

[0070] According to the above U O As can be seen from the expression, in this embodiment, the voltage difference of the collected dry node communication system can be limited to a specified voltage difference range (such as 5 to 24V) by adjusting the resistance values ​​R1 of the first resistor R1 and R3 of the third resistor R3.

[0071] If the voltage difference is less than 5V or there is no voltage difference, the output of differential operational amplifier D2 can output a low level. If the voltage difference exceeds 24V, there is a risk of burning out the operational amplifier; in this case, the output of differential operational amplifier D2 can also output a low level. If the voltage difference is between 5V and 24V, the output of differential operational amplifier D2 can output a high level.

[0072] In this embodiment, since the differential operational amplifier D2 can accurately measure the voltage difference between the two input terminals, the acquisition accuracy of the voltage difference of the transmission link 20 can be improved. Furthermore, the transmission link 20 may be affected by various electromagnetic interferences and noises. The differential operational amplifier D2 has a high common-mode rejection ratio (CMRR), which can effectively suppress these common-mode noises. Even in noisy environments, the differential operational amplifier D2 can accurately detect the actual voltage difference of the dry node 11, thereby improving the reliability and stability of the transmission detection circuit 121.

[0073] In some implementations, please refer again. Figure 4 The isolation conversion circuit 1212 may include: an optocoupler D1, a first transistor Q1, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.

[0074] The first end of the fifth resistor R5 is connected to the acquisition amplifier circuit 1211, and the second end of the fifth resistor R5 is connected to the input end of the optocoupler D1.

[0075] The first output terminal of optocoupler D1 is connected to the first terminal of the sixth resistor R6, and the second output terminal of optocoupler D1 is connected to the base of the first transistor Q1.

[0076] The second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7 and the first power supply, respectively.

[0077] The second end of the seventh resistor R7 is connected to the first input terminal of the controller 122 and the collector of the first transistor Q1, respectively.

[0078] The emitter of the first transistor Q1 is grounded.

[0079] In practical applications, please refer to [the relevant documentation] again. Figure 4 The input terminal of optocoupler D1 is connected to the output terminal of differential operational amplifier D2.

[0080] If the amplified voltage difference is not within the specified voltage difference range, the differential operational amplifier D2 outputs a low level. When the amplified voltage difference received at the input of optocoupler D1 is low, optocoupler D1 is in the open state, thereby causing the first transistor Q1 to also be in the open state. At this time, the voltage of the first power supply (P3V3_1) is transmitted to the first input of controller 122, causing the first input of controller 122 to detect a high-level transmission detection signal. The high-level transmission detection signal can indicate that there is a fault in the transmission link 20.

[0081] When the voltage difference of several nodes in the communication system is within a specified voltage difference range, the differential operational amplifier D2 outputs a high level. When the amplified voltage difference received at the input terminal of optocoupler D1 is high, optocoupler D1 is in a conducting state, thereby causing the first transistor Q1 to also be in a conducting state. This causes the first input terminal of controller 122 to detect a low-level transmission detection signal, which indicates that there is no fault in the transmission link 20.

[0082] In this embodiment, electrical isolation is achieved through optocoupler D1, which helps to improve the safety of the detection circuit and avoid damage to sensitive components (such as controller 122).

[0083] In some implementations, such as Figure 5 As shown, the transmitting detection circuit 123 may include a multiplexer switch, which includes a first contact P1 and a second contact P2 that are connected to each other.

[0084] When the controller 122 sends the first control command, the first contact P1 and the second contact P2 are respectively connected to the corresponding contacts P3 and P5 of the dry node 11 (i.e., the first port n1 and the second port n2 mentioned above).

[0085] When the controller 122 sends the second control command, the first contact P1 and the second contact P2 are disconnected from the dry contact 11 and connected to the output terminal that sends the detection signal.

[0086] In some implementations, when the controller sends a second control command, the first contact is connected to the first power supply (P3V3_1) terminal through a pull-up resistor and outputs a detection signal; the second contact is grounded.

[0087] In some implementations, please refer again. Figure 5 The multi-channel switch can be a relay, specifically a dual-channel relay, which includes a first switch K1, a second switch K2, and an inductor L1.

[0088] The fixed end of the first switch K1 is connected to the first contact P1, and the movable end of the first switch K1 is used to connect to the third contact P3 or the fourth contact P4 under the drive of the inductor L1.

[0089] The fixed end of the second switch K2 is connected to the second contact P2, and the movable end of the second switch is used to connect to the fifth contact P5 or the sixth contact P6 under the drive of the inductor L2; wherein, the third contact P3 and the fifth contact P5 are connected to the transmission link, the fourth contact P4 outputs a detection signal, and the sixth contact P6 is grounded.

[0090] The inductor is connected to the controller 122 and is used to receive a first control command or a second control command, and drive the first switch and the second switch to perform corresponding actions according to the first control command or the second control command.

[0091] For example, the fourth contact P4 can be connected to the second input terminal of the controller 122, one end of the inductor L1 can be connected to the second output terminal of the controller 122, and the other end can be connected to the second power supply (P5V0_1).

[0092] Exemplarily, in some implementations, such as Figure 5 As shown, the transmitting detection circuit 123 may further include: a second transistor Q2, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a capacitor C1.

[0093] The first end of the eighth resistor R8 is connected to the second output terminal of the controller 122, and the second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9 and the base of the second transistor Q2 respectively; the second end of the ninth resistor R9 is grounded.

[0094] The collector of the second transistor Q2 is connected to the first terminal of the inductor L1, and the emitter of the second transistor Q2 is grounded. The second terminal of the inductor L1 is connected to the second power supply (P5V0_1).

[0095] The first end of the tenth resistor R10 is connected to the first end of the capacitor C1 and the second input end of the controller 122. The second end of the tenth resistor R10 is connected to the first end of the eleventh resistor R11 and the fixed end of the first switch K1. The second end of the eleventh resistor R11 is connected to the first power supply.

[0096] For example, in practical applications, both the first switch K1 and the second switch K2 are single-pole double-throw switches. The initial state of the first switch K1 is that its active end is connected to the fourth contact P4, and the initial state of the second switch K2 is that its active end is connected to the sixth contact P6.

[0097] When it is necessary to control the dry contact 11 to be in the closed state, the second output terminal of the controller 122 can output a high-level first control command. This high level can turn on the second transistor Q2, thereby energizing the inductor L1 and generating a magnetic field. The active terminal of the first switch K1 is connected to the third contact P3, and the active terminal of the second switch K2 is connected to the fifth contact P5. Since the third contact P3 is connected to the first port n1 of the dry contact 11, and the fifth contact P5 is connected to the second port n2 of the dry contact 11, the first port n1 and the second port n2 of the dry contact 11 can form a loop, making the dry contact 11 in the closed state. At this time, the second input terminal of the controller 122 should detect the voltage of the first power supply (P3V3_1), i.e., a high-level first detection signal.

[0098] When it is necessary to control the dry contact 11 to be in the open state, the second output terminal of the controller 122 can output a low-level second control command. This low level will de-conduct the second transistor Q2, thereby de-energizing the inductor L1. Both the first switch K1 and the second switch K2 are in their initial states, i.e., the active terminal of the first switch K1 is connected to the fourth contact P4, and the active terminal of the second switch K2 is connected to the sixth contact P6. Therefore, the first port n1 and the second port n2 of the dry contact 11 cannot form a loop, making the dry contact 11 in the open state. At this time, the second input terminal of the controller 122 should detect a low-level second detection signal.

[0099] Therefore, if the control command output by the second output terminal of the controller 122 is high, the transmission detection signal detected by the second input terminal of the controller 122 is high, and if the control command output by the second output terminal of the controller 122 is low, the transmission detection signal detected by the second input terminal of the controller 122 is low, then it can be determined that the control command matches the transmission detection signal, and it can be determined that there is no fault on the sender side of the dry node communication system.

[0100] If the relay control signal output by the second output terminal of the controller 122 is high, and the transmission detection signal detected by the second input terminal of the controller 122 is low, or if the relay control signal output by the second output terminal of the controller 122 is low, and the transmission detection signal detected by the second input terminal of the controller 122 is high, then it can be determined that the control command and the transmission detection signal do not match, and it can be determined that there is a fault in the sender of the dry node communication system.

[0101] As can be seen, in this embodiment, the fault of the sender in the dry node communication system can be accurately detected by relay self-test.

[0102] In some implementations, both the second power supply and the first power supply are isolated power supplies.

[0103] For example, such as Figure 6 As shown, the voltage of the first power supply (P3V3_1) can be obtained by converting the voltage of the second power supply (P5V0_1) through a DC-DC converter (DCDC).

[0104] like Figure 7 As shown, the voltage of the second power supply (P5V0_1) can be obtained by converting the voltage of the fourth power supply (P12V0_1) through a DC-DC converter.

[0105] like Figure 8 As shown, the third power supply (P12V0_2) and the fourth power supply (P12V0_1) can be isolated by a power isolation module.

[0106] Another aspect of the present invention provides a dry node communication system, which includes a sender, a receiver and a transmission link, wherein the sender is provided with a dry node and a detection circuit as described in any of the above embodiments.

[0107] In another aspect, the present invention provides a detection method, which is applied to the detection circuit in any of the above embodiments, such as... Figure 9 As shown, the method may include:

[0108] 110. Send commands to the transmitting detection circuit to control the dry contact to open or close, and receive the corresponding transmitting detection signal; when the dry contact is open, receive the transmitting detection signal sent by the transmitting detection circuit;

[0109] 120. Determine whether there is a fault in the sender based on the transmission detection signal; and determine whether there is a fault in the transmission link based on the transmission detection signal.

[0110] The specific implementation methods of steps 110 to 120 can refer to the working process of the detection circuit in the above embodiments, and therefore will not be repeated here.

[0111] In some implementations, the method may further include:

[0112] If it is determined that the trunk node communication system is faulty, and there are no faults on the sender and the transmission link, then it is determined that the receiver is faulty.

[0113] For example, if a fault is determined in the dry node communication system, but neither the sender nor the transmission link is fault-free, the controller can send a load control command to the receiver's load. If the load responds to the load control command, it can be determined that the receiver is not faulty. If the load does not respond to the load control command, it can be determined that the receiver is faulty. This allows for the detection of faults at the receiver in the dry node communication system.

[0114] In summary, the detection circuit, dry node communication system, and detection method provided in this application can detect faults in the transmission link of a dry node communication system by collecting the voltage difference of the transmission link. Furthermore, fault detection on the transmitter side of the dry node communication system can be achieved by performing a self-test on the relays in the transmitting detection circuit. This allows for rapid and effective location of faults in the dry node communication system, reducing the difficulty of anomaly detection and effectively improving the anomaly detection efficiency of the dry node communication system.

[0115] Those skilled in the art will recognize that the algorithmic steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0116] Furthermore, it should be noted that the combination of the various technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0117] It should be noted that the above examples are merely specific embodiments of the present invention, and the present invention is obviously not limited to the above embodiments, with many similar variations. All modifications that can be directly derived or conceived by those skilled in the art from the content disclosed in this invention should fall within the protection scope of this invention.

[0118] It should be understood that the qualifiers such as "first" and "second" mentioned in the embodiments of the present invention are only for the purpose of more clearly describing the use of the technical solutions of the embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A detection circuit, characterized in that, The invention is applied to a dry node communication system, which includes a transmitter, a receiver, and a transmission link. The transmitter is equipped with a dry node and the detection circuit. The detection circuit includes a transmission detection circuit, a transmission detection circuit, and a controller. Both the transmission detection circuit and the transmission detection circuit are connected to the dry node. The transmission detection circuit is used to control the dry node to open or close according to the instructions of the controller, and output the corresponding transmission detection signal; The transmission detection circuit is used to output a transmission detection signal of the transmission link when the dry node is disconnected; The controller is used to determine whether the sender is faulty based on the transmission detection signal; and to determine whether the transmission link is faulty based on the transmission detection signal.

2. The detection circuit according to claim 1, characterized in that, When the controller sends a first control command and receives a first detection signal from the transmission detection circuit, and when the controller sends a second control command and receives a second detection signal from the transmission detection circuit, it is determined that the transmitter is not faulty.

3. The detection circuit according to claim 2, characterized in that, The transmitting detection circuit includes a multiplexer switch, and the multiplexer switch includes a first contact and a second contact that are connected to each other. When the controller sends the first control command, the first contact and the second contact are respectively connected to the corresponding contact of the dry node; When the controller sends the second control command, the first and second contacts disconnect from the dry node and connect to the output terminal that sends the detection signal.

4. The detection circuit according to claim 3, characterized in that, When the controller sends the second control command, the first contact is connected to the first power supply terminal through a pull-up resistor and outputs the transmission detection signal; the second contact is grounded.

5. The detection circuit according to claim 4, characterized in that, The multiplexer is a relay, and the relay includes a first switch, a second switch, and an inductor; The fixed end of the first switch is connected to the first contact, and the movable end of the first switch is used to connect to the third or fourth contact under the drive of the inductor. The fixed end of the second switch is connected to the second contact, and the movable end of the second switch is used to connect to the fifth or sixth contact under the drive of the inductor; the third and fifth contacts are connected to the transmission link; the fourth contact outputs the transmission detection signal, and the sixth contact is grounded; The inductor is connected to the controller and is used to receive the first control command or the second control command, and drive the first switch and the second switch to perform corresponding actions according to the first control command or the second control command.

6. The detection circuit according to claim 1, characterized in that, The transmission detection circuit includes: an acquisition amplification circuit and an isolation conversion circuit; The acquisition and amplification circuit is connected to the transmission link and is used to acquire and amplify the voltage difference of the transmission link when the dry node is disconnected. The isolation conversion circuit is connected to the acquisition amplification circuit and the controller respectively, and is used to convert the amplified voltage difference into a corresponding transmission detection signal and output it to the controller.

7. The detection circuit according to claim 6, characterized in that, When the amplified voltage difference is within a specified voltage difference range, the isolation conversion circuit outputs a transmission detection signal at a preset level, and the controller determines that there is no fault in the transmission link based on the transmission detection signal.

8. A dry node communication system, characterized in that, The dry node communication system includes a sender, a receiver, and a transmission link. The sender is equipped with a dry node and a detection circuit as described in any one of claims 1 to 7.

9. A detection method, characterized in that, Applied to the controller as described in any one of claims 1 to 7, the method comprises: Send a command to the transmission detection circuit to control the dry node to open or close, and receive the corresponding transmission detection signal; when the dry node is open, receive the transmission detection signal sent by the transmission detection circuit; The sender is determined to have a fault based on the transmission detection signal; and the transmission link is determined to have a fault based on the transmission detection signal.

10. The method according to claim 9, characterized in that, The method further includes: If it is determined that the dry node communication system is faulty, and neither the sender nor the transmission link is faulty, then it is determined that the receiver is faulty.

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