Output control type interface circuit for monitoring external line

Abstract

The utility model relates to an output control type interface circuit for monitoring an external line, and belongs to the technical field of relays, the output control type interface circuit comprises a first active relay JD1, a contact C is connected with a first wiring terminal DZ1, and the other end is connected with a contact B or a contact K; the contact B is connected with an alternating-current live wire L; the K contact is connected with a low-voltage direct-current power supply VCC; the first wiring terminal DZ1 is connected with the input end of the controlled equipment MT; the C contact of the second active relay JD2 is connected with the second wiring terminal DZ2, and the other end of the second active relay JD2 is connected with the B contact or the K contact; the contact B is connected with an alternating current zero line N; the second wiring terminal DZ2 is connected with the output end of the controlled equipment MT; the input end of the monitoring circuit is connected with a K contact in the second active relay JD2, the monitoring end of the monitoring circuit is connected with the monitoring port AD1, and the output end of the monitoring circuit is grounded. The method has the effect that the influence factors that the controlled equipment cannot achieve the expected action effect can be found in time.

Description

Technical Field

[0001] This application relates to the technical field of relays, and in particular to an output control interface circuit for monitoring external lines. Background Technology

[0002] Typical output control circuits only consider the control output as the main control terminal, without considering whether the output control of the main control terminal can actually control the controlled device.

[0003] For example, a device acts as the main control unit, controlling a controlled device (such as a motor / fan) by outputting an active AC signal. If there is an abnormality in the wiring connecting the main control unit to the motor / fan, or if there is an abnormality in the internal electrical circuit of the motor / fan itself, such as a broken wire, even if the main control unit outputs a control signal, the control signal may not reach the motor / fan or the motor / fan may not respond to the control signal. Therefore, the controlled device cannot achieve the expected operating effect.

[0004] For example, a passive relay, as a control device, only needs to control the relay to operate when needed. However, if there is a problem with the connection line between the passive relay and the controlled device, the controlled device will naturally be unable to be controlled by the main control device.

[0005] In related technologies, when the controlled equipment fails to achieve the expected action effect, relevant personnel often cannot promptly identify the influencing factors causing the problem, thereby affecting the control of the controlled equipment by the main control terminal. Utility Model Content

[0006] In order to promptly identify factors that prevent the controlled equipment from achieving the expected operating effect, this application provides an output control interface circuit for monitoring external lines.

[0007] In a first aspect, this application provides an output control interface circuit for monitoring external lines, employing the following technical solution:

[0008] An output control interface circuit for monitoring external lines, comprising:

[0009] The first active relay JD1 has one end of its C contact connected to the first external terminal DZ1 of the main control device, and the other end connected to either the B contact or the K contact. The B contact is connected to the AC live wire L inside the main control device. The K contact is connected to the low-voltage DC power supply VCC inside the main control device. The first terminal DZ1 is connected to the input terminal of the controlled device MT.

[0010] The second active relay JD2 has one end of its C contact connected to the second external terminal DZ2 of the main control device, and the other end connected to either the B contact or the K contact; the B contact is connected to the AC neutral line N inside the main control device; the second terminal DZ2 is connected to the output terminal of the controlled device MT.

[0011] The monitoring circuit has its input terminal connected to the K contact in the second active relay JD2, its monitoring terminal connected to the monitoring port AD1, and its output terminal grounded.

[0012] By adopting the above technical solution, when it is necessary to control the operation of the controlled device MT, the MCU in the main control device controls the first active relay JD1 and the second active relay JD2 to operate, so that the corresponding B and C contacts are turned on. Then the AC power inside the main control device can be applied to the controlled device MT, and the controlled device MT will work normally.

[0013] During the time when the controlled device MT does not need to be controlled, the K and C contacts of the first active relay JD1 and the second active relay JD2 are turned on. The low-voltage DC power supply VCC reaches the controlled device MT through the K and C terminals of the first active relay JD1 and the external line connected to the first terminal DZ1. Then it reaches the second terminal DZ2 through the external line, and then reaches the monitoring circuit through the C and K contacts of the second active relay JD2. Finally, it reaches the power ground through the monitoring circuit, forming a loop.

[0014] By monitoring the monitoring circuit through the monitoring port AD1, it is possible to analyze whether the external lines or the internal electrical circuits of the controlled equipment are normal, thereby enabling timely detection of factors that prevent the controlled equipment from achieving the expected operating effect.

[0015] Optionally, the monitoring circuit includes:

[0016] The first voltage divider resistor R1 is connected at one end to the input terminal of the monitoring circuit and at the other end to the monitoring terminal of the monitoring circuit.

[0017] The second voltage divider resistor R2 has one end connected to the other end of the first voltage divider resistor R1, and the other end connected to the output terminal of the monitoring circuit.

[0018] By adopting the above technical solution, during the time when it is not necessary to control the operation of the controlled device MT, the K and C contacts of the first active relay JD1 and the second active relay JD2 are turned on. The low-voltage DC power supply VCC reaches the controlled device MT through the K and C terminals of the first active relay JD1 and the external line connected to the first terminal DZ1. Then it reaches the second terminal DZ2 through the external line, and then through the C and K contacts of the second active relay JD2, the first voltage divider resistor R1 and the second voltage divider resistor R2 to the power supply ground, forming a circuit.

[0019] By monitoring the voltage of the second voltage divider resistor R2, it is possible to analyze whether the external lines or the internal electrical circuits of the controlled equipment are normal.

[0020] Optionally, the output control interface circuit further includes:

[0021] The positive terminal of the first diode D1 is connected to the low-voltage DC power supply VCC, and the negative terminal is connected to the K contact of the first active relay.

[0022] By adopting the above technical solution, it is possible to prevent external line interference signals from flowing back and affecting the internal power supply of the main control equipment.

[0023] Secondly, this application provides an output control interface circuit for monitoring external lines, employing the following technical solution:

[0024] An output control interface circuit for monitoring external lines, comprising:

[0025] The passive relay JD has its C contact connected to the second external terminal DZ2 of the main control device, and its K contact connected to the first external terminal DZ1 of the main control device.

[0026] The monitoring circuit has one end connected to the K contact and the other end connected to the C contact, with the monitoring end connected to the monitoring port IO1.

[0027] The first resistor R1 has one end connected to the first external terminal DZ3 of the controlled device, and the other end connected to the internal power supply Vdd of the controlled device.

[0028] The second resistor R2 has one end connected to the second external terminal DZ4 of the controlled device and the other end connected to the detection signal terminal IO2.

[0029] The third resistor R3 has one end grounded and the other end connected to the other end of the second resistor R2.

[0030] By adopting the above technical solution, when the main control equipment is not activated, the passive relay contacts are in the open state; when the external line is normal, the power supply Vdd of the controlled equipment goes through the first resistor R1 to the first external terminal DZ3 of the controlled equipment, and then through the external line to the first terminal DZ1 of the main control equipment, and then through the monitoring circuit, the second terminal DZ2, the external line, the second external terminal DZ4, the second resistor R2, and the third resistor R3 to form a circuit.

[0031] When the external line is disconnected or short-circuited, the monitoring port IO1 is at a low level; when the external line is normal, the monitoring port IO1 is at a high level; the status of the external line can be monitored by monitoring the high and low level states of the monitoring port IO1.

[0032] Optionally, the monitoring circuit includes:

[0033] The fourth resistor R4 is connected at one end to one end of the monitoring circuit;

[0034] The optocoupler IC1 has its first end connected to the low-voltage DC power supply VCC inside the main control device, and its second end connected to the other end of the fourth resistor R4.

[0035] The fifth resistor R5 has one end connected to the other end of the monitoring circuit and the other end connected to the third end of the optocoupler IC1; the fourth end of the optocoupler is connected to the monitoring end of the monitoring circuit and is grounded.

[0036] By adopting the above technical solution, when the main control device is not activated, the passive relay contacts are in the open state; when the external line is normal, the power supply Vdd of the controlled device goes through the first resistor R1 to the first external terminal DZ3 of the controlled device, and then through the external line to the first terminal DZ1 of the main control device, and then through the fourth resistor R4, optocoupler IC1, fifth resistor R5, external line, second external terminal DZ4, second resistor R2, and third resistor R3 to form a circuit.

[0037] When current flows through the input terminal of optocoupler IC1, the phototransistor at its output terminal conducts, and the monitoring port IO1 is at a high level. When the external line is disconnected or short-circuited, no current flows through the input terminal of optocoupler IC1, so the phototransistor at its output terminal is cut off, and the monitoring port IO1 is at a low level; thus, the status of the external line is monitored.

[0038] Optionally, the monitoring circuit further includes:

[0039] The sixth resistor R6 has one end connected to the monitoring port IO1 and the other end grounded.

[0040] By adopting the above technical solution, it is possible to detect whether there is a loop current at the input terminal of the optocoupler IC1, so as to form a standard high / low level at the monitoring port IO1.

[0041] Thirdly, this application provides an output control interface circuit for monitoring external lines, employing the following technical solution:

[0042] An output control interface circuit for monitoring external lines, comprising:

[0043] The passive relay JD has its C contact connected to the second external terminal DZ2 of the main control device, and its K contact connected to the first external terminal DZ1 of the main control device; the output terminal of the controlled device MT is connected to the AC neutral line N, and the first terminal DZ1 is connected to the AC live line L.

[0044] The monitoring circuit has the following terminals: the first terminal is connected to the K contact of the passive relay JD; the second terminal is connected to the low-voltage DC power supply VCC in the main control device; the third terminal is connected to the C contact of the passive relay JD; and the fourth terminal is connected to the monitoring port IO1 and grounded.

[0045] By adopting the above technical solution, when the main control device is not operating, the passive relay contacts are in the open state; when the external line is normal, the positive half-axis waveform of the externally connected AC power supply passes through the monitoring circuit and the external line to the controlled device MT, and then returns to the AC neutral line, forming a loop. At this time, the current of the controlled device MT is very small, and the controlled device MT does not work. The monitoring port IO1 has periodic pulses.

[0046] When the external line is disconnected or short-circuited, no current flows through the monitoring circuit, and the monitoring port IO1 is normally at a low level. By judging the status of the external line through the monitoring port IO1, the status of the external line can be monitored.

[0047] When it is necessary to control the operation of the controlled device MT, the contacts of the passive relay JD close, and the external AC live wire is directly applied to the controlled device MT after passing through the contacts of the passive relay JD, and the controlled device MT starts to work.

[0048] Optionally, the monitoring circuit includes:

[0049] The positive terminal of the first diode D1 is connected to the first terminal of the monitoring circuit.

[0050] The first resistor R1 has one end connected to the negative terminal of the first diode D1;

[0051] The optocoupler IC1 has its second terminal connected to the other end of the first resistor R1, and its first terminal connected to the second terminal of the monitoring circuit.

[0052] The second resistor R2 is connected at one end to the third end of the optocoupler IC1;

[0053] The positive terminal of the second diode D2 is connected to the other end of the second resistor R2, and the negative terminal is connected to the third terminal of the monitoring circuit.

[0054] The third resistor R3 has one end connected to the fourth terminal of the optocoupler IC1 and the other end grounded; the monitoring port IO1 is connected to one end of the third resistor R3.

[0055] By adopting the above technical solution, when the main control device is not operating, the passive relay contacts are in the open state. When the external circuit is normal, the positive half-axis waveform of the AC power supply passes through the first diode D1, the first resistor R1, the optocoupler IC1, the second resistor R2, the second diode D2, and the external circuit to the controlled device MT, and then returns to the AC neutral line, forming a loop. At this time, the current flowing through the controlled device MT is very small, and the controlled device MT does not work. When there is a periodic current flowing through the input terminal of the optocoupler IC1, the phototransistor at its output terminal conducts periodically, that is, the monitoring port IO1 has periodic pulses.

[0056] When the external line is disconnected or short-circuited, no current flows through the input terminal of optocoupler IC1, so the phototransistor at its output terminal is cut off, and the monitoring port IO1 is normally at a low level. By judging the status of the external line through the MCU's monitoring port IO1, the status of the external line can be monitored. Attached Figure Description

[0057] Figure 1 This is a circuit structure diagram of the first embodiment of this application;

[0058] Figure 2 This is a circuit structure diagram of the second embodiment of this application;

[0059] Figure 3 This is a circuit structure diagram of the third embodiment of this application.

[0060] Explanation of reference numerals in the attached diagram: 100, monitoring circuit. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the appendices of the embodiments of this utility model will be described below. Figure 1 -Appendix Figure 3 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0062] The first embodiment of this application discloses an output control type interface circuit for monitoring external lines. (See also...) Figure 1 The output control interface circuit includes a first active relay JD1, a second active relay JD2, and a monitoring circuit 100.

[0063] In the first active relay JD1, one end of contact C is connected to the first external terminal DZ1 of the main control device, and the other end is connected to contact B or contact K respectively. Contact B is connected to the AC live wire L inside the main control device, and contact K is connected to the low-voltage DC power supply VCC (generally 5V) inside the main control device. The first terminal DZ1 is connected to the input terminal of the controlled device MT.

[0064] In the second active relay JD2, one end of contact C is connected to the second external terminal DZ2 of the main control device, and the other end is also connected to either contact B or contact C. Contact B is connected to the AC neutral line N within the main control device. Terminal DZ2 is connected to the output terminal of the controlled device MT.

[0065] The input terminal of the monitoring circuit 100 is connected to the K contact in the second active relay JD2, the monitoring terminal is connected to the monitoring port AD1, and the output terminal is grounded.

[0066] Furthermore, the output control interface circuit also includes a first diode D1, the positive terminal of which is connected to the low-voltage DC power supply VCC, and the negative terminal is connected to the K contact of the first active relay.

[0067] The monitoring circuit 100 may include a first voltage divider resistor R1 and a second voltage divider resistor R2.

[0068] In this circuit, one end of the first voltage divider resistor R1 is connected to the input terminal of the monitoring circuit 100, and the other end is connected to the monitoring terminal of the monitoring circuit 100. One end of the second voltage divider resistor R2 is connected to the other end of the first voltage divider resistor R1, and the other end is connected to the output terminal of the monitoring circuit 100.

[0069] The implementation principle of this embodiment is as follows:

[0070] When it is necessary to control the operation of the controlled device MT, the MCU of the main control device controls the first active relay JD1 and the second active relay JD2 to activate the corresponding B and C contacts, so that the AC power L and N inside the main control device can be applied to the controlled device MT, and the controlled device MT will work normally.

[0071] During the time when the controlled device MT does not need to be controlled, the K and C contacts of the first active relay JD1 and the second active relay JD2 are turned on. The low-voltage DC power supply VCC reaches the controlled device MT through the first diode D1, the K and C contacts of the first active relay JD1, and the external line connected to the first terminal DZ1. Then it reaches the second terminal DZ2 through the external line, and then reaches the power supply ground through the C and K contacts of the second active relay JD2, the first voltage divider resistor R1 and the second voltage divider resistor R2, forming a circuit.

[0072] By monitoring the voltage of the second voltage divider resistor R2, it is possible to analyze whether the external lines or the electrical circuits inside the controlled equipment MT are functioning properly.

[0073] This circuit can also be applied to active outputs of other voltages, such as DC24V. Because it uses a relay, the power supply for monitoring is isolated from the low-voltage DC power supply VCC of the main control device, preventing mutual interference.

[0074] Different devices have different DC internal resistances, but the resistance values ​​of the first voltage divider resistor R1 and the second voltage divider resistor R2 can be adjusted to keep the monitoring port AD1 within a reasonable monitoring range. This allows for monitoring of the connected lines for abnormalities even when the controlled device MT is not operating, ensuring that when control of the controlled device MT is needed, the control signal reaches the controlled device MT and that the controlled device MT is in a normal controlled state. This method does not require any modification to the controlled device MT and is simple and easy to implement.

[0075] The second embodiment of this application discloses an output control type interface circuit for monitoring external lines. (See also...) Figure 2 The output control interface circuit includes a passive relay JD, a monitoring circuit 100, a first resistor R1, a second resistor R2, and a third resistor R3.

[0076] In the passive relay JD, the C contact is connected to the second external terminal DZ2 of the main control device, and the K contact is connected to the first external terminal DZ1 of the main control device. One end of the monitoring circuit 100 is connected to the K contact, the other end is connected to the C contact, and the monitoring end is connected to the monitoring port IO1.

[0077] One end of the first resistor R1 is connected to the first external terminal DZ3 of the controlled device, and the other end is connected to the internal power supply Vdd of the controlled device. One end of the second resistor R2 is connected to the second external terminal DZ4 of the controlled device, and the other end is connected to the detection signal terminal IO2. One end of the third resistor R3 is grounded, and the other end is connected to the other end of the second resistor R2.

[0078] The first resistor R1 and the second resistor R2 are inside the controlled equipment and play a protective role to prevent external interference from affecting its power supply Vdd and detection signal terminal IO2; the third resistor R3 is used to ensure that Vdd forms a current loop and is used by the controlled equipment to monitor the voltage of the third resistor R3 in order to determine the state of the passive relay JD contact in the main control equipment.

[0079] The monitoring circuit 100 includes a fourth resistor R4, an optocoupler IC1, a fifth resistor R5, and a sixth resistor R6.

[0080] In this circuit, one end of the fourth resistor R4 is connected to one end of the monitoring circuit 100, and the other end is connected to the second end of the optocoupler IC1. The first end of the optocoupler IC1 is connected to the low-voltage DC power supply VCC inside the main control device. One end of the fifth resistor R5 is connected to the other end of the monitoring circuit 100, and the other end is connected to the third end of the optocoupler IC1. One end of the sixth resistor R6 is connected to the fourth end of the optocoupler and to the monitoring terminal of the monitoring circuit 100; the other end of the sixth resistor R6 is grounded.

[0081] The implementation principle of this embodiment is as follows:

[0082] When the main control device is not activated, the passive relay JD contacts are in the open state. When the external line is normal, the Vdd power supply of the controlled device goes through the first resistor R1 to the first external terminal DZ3 of the controlled device, and then through the external line to the first terminal DZ1 of the main control device. Then, through the fourth resistor R4, optocoupler IC1, fifth resistor R5, second terminal DZ2, external line, second external terminal DZ4, second resistor R2 and third resistor R3 to form a circuit.

[0083] When current flows through the input terminal of optocoupler IC1, the phototransistor at its output terminal conducts, and the monitoring port IO1 is at a high level. When the external line is disconnected or short-circuited, no current flows through the input terminal of optocoupler IC1, so the phototransistor at its output terminal is cut off, and the monitoring port IO1 is at a low level, thus realizing the monitoring of the status of the external line.

[0084] The third embodiment of this application discloses an output control type interface circuit for monitoring external lines. (See also...) Figure 3 The output control interface circuit includes a passive relay JD and a monitoring circuit 100.

[0085] In this configuration, the C contact of the passive relay JD is connected to the second external terminal DZ2 of the main control device, and the K contact is connected to the first external terminal DZ1 of the main control device. The output terminal of the controlled device MT is connected to the AC neutral wire N, and the first terminal DZ1 is connected to the AC live wire L.

[0086] The first terminal of the monitoring circuit 100 is connected to the K contact of the passive relay JD, the second terminal is connected to the low-voltage DC power supply VCC in the main control device, the third terminal is connected to the C contact of the passive relay JD, and the fourth terminal is connected to the monitoring port IO1 and grounded.

[0087] The monitoring circuit 100 includes a first diode D1, a first resistor R1, an optocoupler IC1, a second resistor R2, a second diode D2, and a third resistor R3.

[0088] In this circuit, the anode of the first diode D1 is connected to the first terminal of the monitoring circuit 100, and the cathode is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to the second terminal of the optocoupler IC1. The first terminal of the optocoupler IC1 is connected to the second terminal of the monitoring circuit 100. One end of the second resistor R2 is connected to the third terminal of the optocoupler IC1, and the other end is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the third terminal of the monitoring circuit 100. One end of the third resistor R3 is connected to the fourth terminal of the optocoupler IC1, and the other end is grounded. The monitoring port IO1 is connected to one end of the third resistor R3.

[0089] The implementation principle of this embodiment is as follows:

[0090] When the main control device is not operating, the passive relay JD contacts are in the open state. With the external circuitry normal, the positive half-axis waveform of the externally connected AC power supply passes through the first diode D1, the first resistor R1, the optocoupler IC1, the second resistor R2, the second diode D2, and the external circuitry to the controlled device MT, and then back to the AC neutral line, forming a loop. At this time, the current in the controlled device MT is very small, and the controlled device MT does not operate. A periodic current flows through the input terminal of the optocoupler IC1, causing its output phototransistor to conduct periodically, meaning that the monitoring port IO1 has periodic pulses; taking a 50Hz AC power supply as an example, the period is 20ms, and the duty cycle is 1 / 2.

[0091] When the external line is disconnected or short-circuited, no current flows through the input terminal of optocoupler IC1, so the phototransistor at its output terminal is cut off, and the monitoring port IO1 is normally at a low level. By judging the status of the external line through the MCU's monitoring port IO1, the status of the external line can be monitored.

[0092] When it is necessary to control the operation of the controlled device MT, the contacts of the passive relay JD close, and the external AC live wire is directly applied to the controlled device MT after passing through the contacts of the passive relay JD, and the controlled device MT starts to work.

[0093] Adding filtering capacitors to the circuits related to this application, or changing the values ​​of components, changing the power supply voltage, adding / removing components or changing their equivalent positions, adding other anti-interference components, or replacing them with other components with equivalent functions, are all considered to be within the scope of protection of this application.

[0094] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. An output control interface circuit for monitoring external lines, characterized in that, include: The first active relay JD1 has one end of its C contact connected to the first external terminal DZ1 of the main control device, and the other end connected to either the B contact or the K contact. The B contact is connected to the AC live wire L inside the main control device. The K contact is connected to the low-voltage DC power supply VCC inside the main control device. The first terminal DZ1 is connected to the input terminal of the controlled device MT. The second active relay JD2 has one end of its C contact connected to the second external terminal DZ2 of the main control device, and the other end connected to either the B contact or the K contact; the B contact is connected to the AC neutral line N inside the main control device; the second terminal DZ2 is connected to the output terminal of the controlled device MT. The monitoring circuit (100) has its input terminal connected to the K contact in the second active relay JD2, its monitoring terminal connected to the monitoring port AD1, and its output terminal grounded.

2. The output control interface circuit for monitoring external lines according to claim 1, characterized in that, The monitoring circuit (100) includes: The first voltage divider resistor R1 is connected at one end to the input terminal of the monitoring circuit (100) and at the other end to the monitoring terminal of the monitoring circuit (100). The second voltage divider resistor R2 has one end connected to the other end of the first voltage divider resistor R1, and the other end connected to the output terminal of the monitoring circuit (100).

3. The output control interface circuit for monitoring external lines according to claim 2, characterized in that, The output control interface circuit also includes: The positive terminal of the first diode D1 is connected to the low-voltage DC power supply VCC, and the negative terminal is connected to the K contact of the first active relay.

4. An output control interface circuit for monitoring external lines, characterized in that, include: The passive relay JD has its C contact connected to the second external terminal DZ2 of the main control device, and its K contact connected to the first external terminal DZ1 of the main control device. The monitoring circuit (100) has one end connected to the K contact and the other end connected to the C contact, and the monitoring end is connected to the monitoring port IO1. The first resistor R1 has one end connected to the first external terminal DZ3 of the controlled device, and the other end connected to the internal power supply Vdd of the controlled device. The second resistor R2 has one end connected to the second external terminal DZ4 of the controlled device and the other end connected to the detection signal terminal IO2. The third resistor R3 has one end grounded and the other end connected to the other end of the second resistor R2.

5. The output control interface circuit for monitoring external lines according to claim 4, characterized in that, The monitoring circuit (100) includes: The fourth resistor R4 is connected at one end to one end of the monitoring circuit (100); The optocoupler IC1 has its first end connected to the low-voltage DC power supply VCC inside the main control device, and its second end connected to the other end of the fourth resistor R4. The fifth resistor R5 has one end connected to the other end of the monitoring circuit (100) and the other end connected to the third end of the optocoupler IC1; the fourth end of the optocoupler is connected to the monitoring end of the monitoring circuit (100) and grounded.

6. The output control interface circuit for monitoring external lines according to claim 5, characterized in that, The monitoring circuit (100) also includes: The sixth resistor R6 has one end connected to the monitoring port IO1 and the other end grounded.

7. An output control interface circuit for monitoring external lines, characterized in that, include: The passive relay JD has its C contact connected to the second external terminal DZ2 of the main control device, and its K contact connected to the first external terminal DZ1 of the main control device; the output terminal of the controlled device MT is connected to the AC neutral line N, and the first terminal DZ1 is connected to the AC live line L. The monitoring circuit (100) has a first terminal connected to the K contact of the passive relay JD, a second terminal connected to the low-voltage DC power supply VCC in the main control device, a third terminal connected to the C contact of the passive relay JD, and a fourth terminal connected to the monitoring port IO1 and grounded.

8. The output control interface circuit for monitoring external lines according to claim 7, characterized in that, The monitoring circuit (100) includes: The positive terminal of the first diode D1 is connected to the first terminal of the monitoring circuit (100); The first resistor R1 has one end connected to the negative terminal of the first diode D1; The second end of the optocoupler IC1 is connected to the other end of the first resistor R1, and the first end is connected to the second end of the monitoring circuit (100). The second resistor R2 is connected at one end to the third end of the optocoupler IC1; The positive terminal of the second diode D2 is connected to the other end of the second resistor R2, and the negative terminal is connected to the third terminal of the monitoring circuit (100); The third resistor R3 has one end connected to the fourth terminal of the optocoupler IC1 and the other end grounded; the monitoring port IO1 is connected to one end of the third resistor R3.

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