A switching circuit and a hybrid and leakage monitoring device for hybrid and leakage monitoring of a power panel

Abstract

The utility model provides a kind of switching circuit and and mixed power monitoring device for power screen's mixed power and leakage monitoring, including power module, multiple leakage relays and mixed power monitoring module;Mixed power monitoring module includes mixed power main control unit, main control relay and power mixed power detection circuit, wherein, mixed power main control unit is connected with power screen by the contact switch of main control relay, power mixed power detection circuit;Power module connects the power supply port of main control relay by multiple leakage relays connected in series, to power supply for main control relay;The connection point of multiple leakage relays connected in series and main control relay is also connected the input end of mixed power main control unit by leakage relay state acquisition circuit;Mixed power main control unit is connected the control port of main control relay by relay drive circuit, for controlling the coil of main control relay is powered or power loss.The utility model has realized the automatic switching of leakage and mixed power monitoring, improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power supply panel monitoring technology, specifically, to a switching circuit and a mixed current monitoring device for monitoring mixed current and leakage current in a power supply panel. Background Technology

[0002] Power supply panels are a crucial component of railway signaling systems, providing stable and reliable power to railway signaling equipment. However, during actual operation, power supply panels may experience mixed-power faults, where electrical connections between different power sources occur, leading to abnormal power output. Mixed-power faults can affect the normal operation of signaling equipment and even cause safety accidents. Common causes of mixed-power faults include: accidental connection of output lines from different power sources, resulting in short circuits; incorrect wiring during installation or maintenance, leading to mixed connections between different power sources; and power lines connecting after insulation damage.

[0003] Power supply panel leakage current fault detection refers to the monitoring and diagnosis of leakage current in the power supply panel. Leakage current refers to current leaking from the normal path to the ground wire or other parts that should not be energized, which may lead to equipment damage or safety hazards. Common causes of leakage current faults include: aging or damage to insulation materials, leading to current leakage; humid environment or contaminants causing a decline in insulation performance, resulting in leakage; and damage or aging of internal components, leading to leakage.

[0004] In practical work, it is sometimes necessary to detect mixed current faults and sometimes to detect leakage current faults. Since the test positions for mixed current monitoring and leakage current monitoring on the power supply panel are often the same, mixed current testing and leakage current testing cannot be performed simultaneously. In existing technologies, the test is often performed manually to adjust whether to perform mixed current monitoring or leakage current monitoring, which is inefficient.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a switching circuit and a mixed current monitoring device for power supply panels to monitor mixed current and leakage current, thereby solving the problem of low working efficiency.

[0007] To achieve the above objectives, the first aspect of this utility model provides a switching circuit for monitoring mixed current and leakage current in a power supply panel: including a power module, multiple leakage current relays and a mixed current monitoring module; the mixed current monitoring module includes a mixed current main control unit, a main control relay and a power mixed current detection circuit, wherein the mixed current main control unit is connected to the power supply panel through the contact switch of the main control relay and the power mixed current detection circuit;

[0008] The power module is connected to the power supply port of the main control relay through multiple leakage relays connected in series to supply power to the main control relay.

[0009] The connection points of the multiple leakage relays and the main control relay connected in series are also connected to the input terminal of the hybrid main control unit through the leakage relay status acquisition circuit.

[0010] The hybrid main control unit is connected to the control port of the main control relay through a relay drive circuit. It is used to control the coil of the main control relay to be energized or de-energized according to the received leakage relay status, thereby controlling the contact switch of the main control relay to be engaged or disengaged, so as to realize the connection or disconnection of the hybrid monitoring module and the power supply panel.

[0011] Based on the above, the leakage current relay status acquisition circuit includes a first diode, a Zener diode, a first resistor, and a first optocoupler;

[0012] The connection point of the multiple leakage relays and the main control relay connected in series is connected to the input terminal of the leakage relay status acquisition circuit; the input terminal of the leakage relay status acquisition circuit is connected in series with the first diode, the Zener diode, the first resistor, and the light-emitting diode of the first optocoupler, and then grounded; wherein, the positive terminal of the first diode is connected to the input terminal of the leakage relay status acquisition circuit, the negative terminal of the Zener diode is connected to the negative terminal of the first diode, and the negative terminal of the light-emitting diode of the first optocoupler is grounded;

[0013] The collector of the phototransistor of the first optocoupler serves as the output terminal of the leakage current relay status acquisition circuit and is connected to the input terminal of the hybrid main control unit.

[0014] The emitter of the phototransistor in the first optocoupler is grounded.

[0015] Based on the above, the relay driving circuit includes a first buffer, a second resistor, a second optocoupler, and a third resistor;

[0016] The output terminal of the hybrid main control unit is connected to the input pin of the first buffer, and the output pin of the first buffer is connected to the cathode of the diode of the second optocoupler through the second resistor. The power supply VCC is connected to the anode of the diode of the second optocoupler.

[0017] A third resistor is connected in parallel between the base and emitter of the transistor in the second optocoupler, and the emitter of the transistor in the second optocoupler is also grounded;

[0018] The collector of the transistor in the second optocoupler serves as the output terminal of the relay drive circuit, connecting to the control port of the main control relay.

[0019] The second aspect of this utility model provides a mixed current monitoring device for a power supply panel, including any of the above-mentioned switching circuits for mixed current and leakage current monitoring of a power supply panel.

[0020] The power supply mixing detection circuit includes a routing network and a signal acquisition module;

[0021] One end of the routing network is connected to multiple power lines of the power supply panel, and the other end of the routing network is connected to the hybrid main control unit of the switching circuit through a signal acquisition module.

[0022] The mixing control unit of the switching circuit is also connected to the control terminal of the routing network, which is used to select any two power lines to connect to the signal acquisition module for mixing detection.

[0023] Based on the above, the routing network includes multiple relay drive circuits and multiple relays. The input terminal of the relay drive circuit is connected to the hybrid main control unit, and the output terminal of each relay drive circuit is connected to the control port of a relay.

[0024] Based on the above, each relay drive circuit includes a second buffer, a fourth resistor, a third optocoupler, and a fifth resistor.

[0025] The output terminal of the hybrid main control unit is connected to the input pin of the second buffer, and the output pin of the second buffer is connected to the cathode of the diode of the third optocoupler through the fourth resistor. The power supply VCC is connected to the anode of the diode of the third optocoupler.

[0026] A fifth resistor is connected in parallel between the base and emitter of the transistor in the third optocoupler, and the emitter of the transistor in the third optocoupler is also grounded;

[0027] The collector of the transistor in the third optocoupler serves as the output terminal of the relay drive circuit, and is connected to the control port of the corresponding relay in the routing network to control the opening and closing of the corresponding relay in the routing network.

[0028] Based on the above, a mixed-current monitoring device for a power supply panel further includes a CAN communication module and a host computer.

[0029] The hybrid main control unit is connected to the host computer via the CAN communication module to receive control commands.

[0030] This invention represents a substantial improvement over existing technologies. Specifically, since the test positions for mixed-current monitoring and leakage current monitoring on the power supply panel are often the same, mixed-current testing and leakage current testing cannot be performed simultaneously. When all leakage current relays are engaged, leakage current monitoring is performed. The input of the leakage current relay status acquisition circuit is high. Upon receiving this high level, the mixed-current main control unit de-energizes the coil of the main control relay via the relay drive circuit, thereby opening the contact switch of the main control relay and disconnecting the mixed-current monitoring module from the power supply panel to stop mixed-current monitoring. When all leakage current relays are disconnected, leakage current monitoring stops. The level acquired by the leakage current relay status acquisition circuit is low. Upon receiving this low level, the mixed-current main control unit energizes the coil of the main control relay via the relay drive circuit, thereby closing the contact switch of the main control relay and connecting the mixed-current monitoring module to the power supply panel for mixed-current monitoring. This invention achieves automatic switching between leakage current monitoring and mixed-current monitoring, improving work efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the switching circuit for monitoring the mixing and leakage current of a power supply panel according to this utility model.

[0032] Figure 2 This is a schematic diagram of the leakage current relay status acquisition circuit of this utility model;

[0033] Figure 3 This is a schematic diagram of the relay drive circuit of the main control relay of this utility model.

[0034] Figure 4 This is a schematic diagram of the principle of a hybrid power monitoring device for a power supply panel according to the present invention;

[0035] Figure 5 This is a schematic diagram of the routing network principle of this utility model;

[0036] Figure 6 This is a schematic diagram of the relay drive circuit in the routing network of this utility model.

[0037] Figure 7 This is a schematic diagram of the principle of a hybrid power monitoring device for a power supply panel, including a CAN communication module and a host computer.

[0038] Figure 8 This is a schematic diagram of the routing network principle of this utility model. Detailed Implementation

[0039] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0040] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application.

[0041] Example 1

[0042] As attached Figure 1 As shown, this embodiment provides an implementation of a switching circuit for monitoring the mixing and leakage current of a power supply panel.

[0043] A switching circuit for monitoring mixed current and leakage current in a power supply panel includes a power module, multiple leakage current relays (JA0, J80, J80', etc.) and a mixed current monitoring module; the mixed current monitoring module includes a mixed current main control unit, a main control relay and a power mixed current detection circuit, wherein the mixed current main control unit is connected to the power supply panel through the contact switch of the main control relay and the power mixed current detection circuit;

[0044] The power module is connected to the power supply port of the main control relay through multiple leakage relays connected in series to supply power to the main control relay.

[0045] The connection points of the multiple leakage relays and the main control relay connected in series are also connected to the input terminal of the hybrid main control unit through the leakage relay status acquisition circuit.

[0046] The hybrid main control unit is connected to the control port of the main control relay through a relay drive circuit. It is used to control the coil of the main control relay to be energized or de-energized according to the received leakage relay status, thereby controlling the contact switch of the main control relay to be engaged or disengaged, so as to realize the connection or disconnection of the hybrid monitoring module and the power supply panel.

[0047] The power supply module can output 24 volts; the hybrid main control unit can be a DSP digital signal processing module.

[0048] It should be noted that there may be multiple connections between the power mixing detection circuit and the mixing main control unit. Therefore, there is no limit to the number of contact switches of the main control relay between the power mixing detection circuit and the mixing main control unit, so that there is a contact switch of the main control relay between each connection.

[0049] It should be noted that because the test location for mixed current monitoring and leakage current monitoring on the power supply panel is the same, mixed current monitoring and leakage current monitoring cannot be performed simultaneously on the power supply panel. In actual use, if leakage current testing is initiated, the associated leakage current relays JA0, J80, and J80' will all be activated, stopping mixed current monitoring.

[0050] Specifically, Figure 1 Multiple leakage current relays are disconnected. When all leakage current relays are disconnected, a path is formed between the power supply port of the power module and the main control relay, allowing the power module to supply power to the coil of the main control relay. The leakage current relay status acquisition circuit acquires a low-level signal, which is output to the hybrid main control unit. Upon receiving the low-level signal, the hybrid main control unit controls the coil of the main control relay to be energized through the relay drive circuit, thereby controlling the contact switch of the main control relay to close, thus connecting the hybrid monitoring module to the power supply panel for hybrid monitoring and stopping leakage current monitoring. The contacts of the main control relay are normally open contacts.

[0051] When multiple leakage relays are engaged, leakage current monitoring is performed. The power supply path between the power module and the main control relay is disconnected, and the input terminal of the leakage relay status acquisition circuit is in a floating state. The level acquired by the leakage relay status acquisition circuit is a high level (the level signal received when the input terminal of the leakage relay status acquisition circuit is floating is a high level signal). After receiving the high level, the hybrid main control unit controls the coil of the main control relay to de-energize through the relay drive circuit, thereby controlling the contact switch of the main control relay to open, realizing the disconnection of the hybrid monitoring module from the power supply panel, so as to stop hybrid monitoring.

[0052] The hybrid main control unit controls the energization or de-energization of the coil of the main control relay, thereby controlling the contact switch of the main control relay to close or open, thus achieving the purpose of switching between hybrid and leakage current monitoring.

[0053] Example 2

[0054] As attached Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that a specific implementation method for the leakage current relay status acquisition circuit is given.

[0055] The leakage current relay status acquisition circuit includes a first diode (D1), a Zener diode (Z1), a first resistor (R23), and a first optocoupler (U6).

[0056] The connection point of the multiple leakage relays and the main control relay connected in series is connected to the input terminal (IN) of the leakage relay status acquisition circuit; the input terminal of the leakage relay status acquisition circuit is connected in series with the first diode, the Zener diode, the first resistor, and the light-emitting diode of the first optocoupler, and then grounded; wherein, the positive terminal of the first diode is connected to the input terminal of the leakage relay status acquisition circuit, the negative terminal of the Zener diode is connected to the negative terminal of the first diode, and the negative terminal of the light-emitting diode of the first optocoupler is grounded;

[0057] The collector of the phototransistor of the first optocoupler serves as the output terminal (DI) of the leakage current relay status acquisition circuit, and is connected to the input terminal of the hybrid main control unit.

[0058] The emitter of the phototransistor in the first optocoupler is grounded.

[0059] It should be noted that diode D1 is used to prevent reverse connection; Zener diode Z1 limits the voltage input to the switching signal acquisition circuit; resistor R23 limits the current input to the switching signal acquisition circuit. Optocoupler U6 isolates the input and output.

[0060] The high or low level state of the input terminal (IN) of the leakage current relay status acquisition circuit is transmitted through the first diode (D1), the Zener diode (Z1), the first resistor (R23), and the first optocoupler (U6), and the output terminal (DI) of the leakage current relay status acquisition circuit outputs a high or low level signal to the hybrid main control unit.

[0061] When the input terminal (IN) of the leakage current relay status acquisition circuit is at a high level, the output terminal (DI) outputs a high-level signal; when the input terminal (IN) of the leakage current relay status acquisition circuit is at a low level, the output terminal (DI) outputs a low-level signal.

[0062] Example 3

[0063] As attached Figure 3 As shown, the difference between this embodiment and embodiment 1 or 2 is that a specific implementation method of the relay drive circuit of the main control relay is given.

[0064] The relay drive circuit of the main control relay includes a first buffer (U3), a second resistor (R20), a second optocoupler (U4), and a third resistor (R17).

[0065] The output terminal of the hybrid main control unit is connected to the input pin of the first buffer, and the output pin (Q1) of the first buffer is connected to the cathode of the diode of the second optocoupler through the second resistor. The power supply VCC is connected to the anode of the diode of the second optocoupler.

[0066] A third resistor is connected in parallel between the base and emitter of the transistor in the second optocoupler, and the emitter of the transistor in the second optocoupler is also grounded;

[0067] The collector of the transistor in the second optocoupler serves as the output terminal (OUT1) of the relay drive circuit, which is connected to the control port of the main control relay.

[0068] The peripheral circuitry of buffer U3 is existing technology and will not be described in detail.

[0069] The resistor R20 is used for current limiting; the second optocoupler (U4) is used to isolate the input and output.

[0070] It should be noted that the control signal (D0) output by the hybrid main control unit is input to the main control relay through the relay drive circuit to control the coil of the main control relay to be energized or de-energized. When the hybrid main control unit receives a low-level signal output from the leakage current relay status acquisition circuit, the control signal (D0) controls the coil of the main control relay to be energized. When the hybrid main control unit receives a high-level signal output from the leakage current relay status acquisition circuit, the control signal (D0) controls the coil of the main control relay to be de-energized.

[0071] Example 4

[0072] As attached Figure 4 As shown, this embodiment provides a mixed current monitoring device for a power supply panel, including a switching circuit for mixed current and leakage current monitoring of a power supply panel as described in any of the above embodiments.

[0073] The power supply mixing detection circuit includes a routing network and a signal acquisition module;

[0074] One end of the routing network is connected to multiple power lines of the power supply panel, and the other end of the routing network is connected to the hybrid main control unit of the switching circuit through a signal acquisition module.

[0075] The mixing control unit of the switching circuit is also connected to the control terminal of the routing network, which is used to select any two power lines to connect to the signal acquisition module for mixing detection.

[0076] It should be noted that cross-current monitoring targets two power lines, and its purpose is to detect whether cross-current occurs between them. For example, when the insulation of two power lines is damaged and the damaged parts of the insulation come into contact, the current between the two power lines will change, and this is considered a cross-current phenomenon.

[0077] When the two power lines are not mixed, the signal acquisition module collects a larger current between the two power lines; when the two power lines are mixed, the signal acquisition module collects a smaller current between the two power lines. Based on this, it is determined whether there is a mixing of currents between the power lines.

[0078] Specifically, during mixed-current monitoring, the contact switch of the main control relay closes. The mixed-current main control unit selects any two power lines to connect to the signal acquisition module through the control routing network. The current information between these two power lines is acquired by the signal acquisition module, and the current information acquired by the signal acquisition module is transmitted to the mixed-current main control unit for processing through the contact switch of the main control relay to determine whether mixed-current occurs between the power lines or the degree of mixed-current.

[0079] Example 5

[0080] As attached Figure 5 As shown, the difference between this embodiment and embodiment 4 is that the implementation method of the routing network is given.

[0081] The routing network includes multiple relay drive circuits and multiple relays. The input terminal of each relay drive circuit is connected to the hybrid main control unit, and the output terminal of each relay drive circuit is connected to the control port of a relay.

[0082] It should be noted that the relay drive circuits in the routing network correspond one-to-one with the relays. The hybrid main control unit controls the corresponding relays to engage or disengage through the relay drive circuits in the routing network, so as to select any two power lines to connect to the signal acquisition module.

[0083] like Figure 8As shown, in one specific embodiment, the routing network includes relays JHD30, JHD40, JHD50, JHD60, JHD30', JHD40', JHD50', and JHD60', each relay having 8 sets of switching contacts. Each set of switching contacts includes one upper contact, one lower contact, and one middle contact. Specifically, relay JHD30 uses 8 sets of switching contacts, relay JHD40 uses 4 sets of switching contacts, relay JHD50 uses 2 sets of switching contacts, and relay JHD60 uses 1 set of switching contacts. The 16 upper and lower contacts of the 8 sets of changeover contacts of relay JHD30 are connected to 16 power lines under test. The 8 middle contacts of relay JHD30 are connected to the 8 upper and lower contacts of the 4 sets of changeover contacts of relay JHD40. The middle contacts of the 4 sets of changeover contacts of relay JHD40 are connected to the upper and lower contacts of the 4 upper and lower contacts of the 2 sets of changeover contacts of relay JHD50. The middle contacts of the 2 sets of changeover contacts of relay JHD50 are connected to the upper and lower contacts of the 1 set of changeover contacts of relay JHD60. The middle contact of the 1 set of changeover contacts of relay JHD60 is connected to a signal input terminal of the signal acquisition module, forming a selection channel for the 16 power lines under test. Figure 8 As shown, JHD30', JHD40', JHD50', and JHD60' are symmetrically designed with JHD30, JHD40, JHD50, and JHD60. The connection relationship of JHD30', JHD40', JHD50', and JHD60' will not be elaborated further. Through JHD30', JHD40', JHD50', and JHD60', 16 power lines under test can also be selected and connected to the signal acquisition module via another signal input terminal of the signal acquisition module.

[0084] It should be noted that, since the two power lines under test need to be input to the power mixing detection circuit at the same time, and the connection of these two power lines under test cannot interfere with each other, the routing network is designed symmetrically, and the two power lines under test are connected to the power mixing detection circuit through independent networks.

[0085] Example 6

[0086] As attached Figure 6 As shown, the difference between this embodiment and embodiment 5 is that a specific implementation method for the relay driving circuit of the relay in the routing network is given.

[0087] Each relay drive circuit includes a second buffer (U5), a fourth resistor (R21), a third optocoupler (U7), and a fifth resistor (R22).

[0088] The output terminal of the hybrid main control unit is connected to the input pin (D1) of the second buffer, and the output pin (Q1) of the second buffer is connected to the cathode of the diode of the third optocoupler through the fourth resistor. The power supply VCC is connected to the anode of the diode of the third optocoupler.

[0089] A fifth resistor is connected in parallel between the base and emitter of the transistor in the third optocoupler, and the emitter of the transistor in the third optocoupler is also grounded;

[0090] The collector of the transistor in the third optocoupler serves as the output terminal (OUT2) of the relay drive circuit, which is connected to the control port of the corresponding relay in the routing network to control the opening and closing of the corresponding relay in the routing network.

[0091] It should be noted that the gating signal output by the hybrid main control unit is input to the relay drive circuit of the relay in the routing network through the input pin (D1) of the second buffer. The output terminal (OUT2) of the relay drive circuit outputs the gating signal. The gating signal is input to the corresponding relay through the control port of the corresponding relay to control the on / off state of the corresponding relay, so as to achieve the purpose of selecting any two power lines to be connected to the signal acquisition module.

[0092] Example 7

[0093] As attached Figure 7 As shown, the difference between this embodiment and any embodiment of embodiment 6 is that the hybrid power monitoring device for a power supply panel further includes a CAN communication module and a host computer.

[0094] The hybrid main control unit is connected to the host computer via the CAN communication module to receive control commands.

[0095] It should be noted that the host computer transmits the serial number information of the power supply under test to the hybrid power control unit through the CAN communication module. The hybrid power control unit, based on the received serial number information of the power supply under test, controls the on / off state of the corresponding relays through the relay drive circuit in the routing network to select any two power lines to connect to the signal acquisition module for hybrid power monitoring.

[0096] In some embodiments, the power module of this invention may be model URF2405P-6WR3. The CAN communication module may be model ADM3053.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A switching circuit for monitoring mixing and leakage current in a power supply panel, characterized in that: It includes a power module, multiple leakage relays, and a mixed-current monitoring module; the mixed-current monitoring module includes a mixed-current main control unit, a main control relay, and a power mixed-current detection circuit, wherein the mixed-current main control unit is connected to the power supply panel through the contact switch of the main control relay and the power mixed-current detection circuit; The power module is connected to the power supply port of the main control relay through multiple leakage relays connected in series to supply power to the main control relay. The connection points of the multiple leakage relays and the main control relay connected in series are also connected to the input terminal of the hybrid main control unit through the leakage relay status acquisition circuit. The hybrid main control unit is connected to the control port of the main control relay through a relay drive circuit. It is used to control the coil of the main control relay to be energized or de-energized according to the received leakage relay status, thereby controlling the contact switch of the main control relay to be engaged or disengaged, so as to realize the connection or disconnection of the hybrid monitoring module and the power supply panel.

2. The switching circuit for monitoring mixing and leakage current in a power supply panel according to claim 1, characterized in that: The leakage current relay status acquisition circuit includes a first diode, a Zener diode, a first resistor, and a first optocoupler; The connection point of the multiple leakage relays and the main control relay connected in series is connected to the input terminal of the leakage relay status acquisition circuit; the input terminal of the leakage relay status acquisition circuit is connected in series with the first diode, the Zener diode, the first resistor, and the light-emitting diode of the first optocoupler, and then grounded; wherein, the positive terminal of the first diode is connected to the input terminal of the leakage relay status acquisition circuit, the negative terminal of the Zener diode is connected to the negative terminal of the first diode, and the negative terminal of the light-emitting diode of the first optocoupler is grounded; The collector of the phototransistor of the first optocoupler serves as the output terminal of the leakage current relay status acquisition circuit and is connected to the input terminal of the hybrid main control unit. The emitter of the phototransistor in the first optocoupler is grounded.

3. A switching circuit for monitoring mixing and leakage current in a power supply panel according to claim 1 or 2, characterized in that: The relay drive circuit includes a first buffer, a second resistor, a second optocoupler, and a third resistor; The output terminal of the hybrid main control unit is connected to the input pin of the first buffer, and the output pin of the first buffer is connected to the cathode of the diode of the second optocoupler through the second resistor. The power supply VCC is connected to the anode of the diode of the second optocoupler. A third resistor is connected in parallel between the base and emitter of the transistor in the second optocoupler, and the emitter of the transistor in the second optocoupler is also grounded; The collector of the transistor in the second optocoupler serves as the output terminal of the relay drive circuit, connecting to the control port of the main control relay.

4. A mixed-current monitoring device for a power supply panel, characterized in that: Including a switching circuit for power supply panel mixing and leakage current monitoring as described in any one of claims 1 to 3; The power supply mixing detection circuit includes a routing network and a signal acquisition module; One end of the routing network is connected to multiple power lines of the power supply panel, and the other end of the routing network is connected to the hybrid main control unit of the switching circuit through a signal acquisition module. The mixing control unit of the switching circuit is also connected to the control terminal of the routing network, which is used to select any two power lines to connect to the signal acquisition module for mixing detection.

5. A mixed-current monitoring device for a power supply panel according to claim 4, characterized in that: The routing network includes multiple relay drive circuits and multiple relays. The input terminal of each relay drive circuit is connected to the hybrid main control unit, and the output terminal of each relay drive circuit is connected to the control port of a relay.

6. A mixed-current monitoring device for a power supply panel according to claim 5, characterized in that: Each relay drive circuit includes a second buffer, a fourth resistor, a third optocoupler, and a fifth resistor; The output terminal of the hybrid main control unit is connected to the input pin of the second buffer, and the output pin of the second buffer is connected to the cathode of the diode of the third optocoupler through the fourth resistor. The power supply VCC is connected to the anode of the diode of the third optocoupler. A fifth resistor is connected in parallel between the base and emitter of the transistor in the third optocoupler, and the emitter of the transistor in the third optocoupler is also grounded; The collector of the transistor in the third optocoupler serves as the output terminal of the relay drive circuit, and is connected to the control port of the corresponding relay in the routing network to control the opening and closing of the corresponding relay in the routing network.

7. A mixed-current monitoring device for a power supply panel according to any one of claims 4 to 6, characterized in that: It also includes a CAN communication module and a host computer; The hybrid main control unit is connected to the host computer via the CAN communication module to receive control commands.

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