Automatic switching circuit, automatic switching device and automatic switching equipment for metering secondary current loop
By combining the metering instrument module, load control terminal module, junction box module, and switching module, the problem of low efficiency in automatic switching of secondary current loops is solved, and fast and efficient power supply circuit switching is achieved.
Patent Information
- Application Number
- CN202422944636.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the existing technology, the automatic switching efficiency of the secondary current loop is low, mainly because the control loop is complex and there is a delay during switching, resulting in a long signal response time.
The design employs a combination of metering instrument modules, load control terminal modules, junction box modules, and switching modules. By reducing the number of modules and using relay control, it enables rapid switching between main power supply and backup power supply circuits.
It improves the automatic switching efficiency of the secondary current loop, reduces signal response time, and enhances the speed and efficiency of switching.
Smart Images
Figure CN223652008U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit switching technology, specifically to an automatic switching circuit, automatic switching device, and automatic switching equipment for metering secondary current loops. Background Technology
[0002] Existing solutions typically use two sets of dual-power switching devices to switch between the current and voltage loops. However, this solution requires a large amount of space and has a complex control circuit. This complexity leads to low efficiency in the automatic switching of the secondary current loop. Furthermore, the dual-power switching devices have a delay during switching, resulting in a long signal response time during loop switching, further contributing to the low efficiency in the automatic switching of the secondary current loop. Utility Model Content
[0003] One objective of this application is to provide an automatic switching circuit, automatic switching device, and automatic switching equipment for metering secondary current loops, aiming to improve the efficiency of automatic switching of secondary current loops.
[0004] In a first aspect, embodiments of this application provide an automatic switching circuit for a metering secondary current loop, applied to electronic equipment. The automatic switching circuit for the metering secondary current loop includes: a metering instrument module, a load control terminal module, a junction box module, and a switching module, wherein...
[0005] The output port of the switching module is connected to the input port of the junction box module. The first output port of the junction box module is connected to the input port of the metering instrument module. The second output port of the junction box module is connected to the input port of the load control terminal module. The first output port of the load control terminal module is connected to the input port of the metering instrument module. The second output port of the load control terminal module is connected to the input port of the switching module.
[0006] The switching module is used to transmit first circuit information or second circuit information to the junction box module, and to receive first circuit control information transmitted by the negative control terminal module, and to switch between the main power supply circuit and the backup power supply circuit according to the first circuit control information. The first circuit information includes voltage information and current information in the main power supply circuit, and the second circuit information includes voltage information and current information in the backup power supply circuit.
[0007] The junction box module is used to transmit the first circuit information to the metering instrument module and the load control terminal module, or to transmit the second circuit information to the metering instrument module and the load control terminal module.
[0008] The load control terminal module is used to receive first circuit information or second circuit information, and to generate second loop control information based on the first circuit information, wherein the second loop control information is used to indicate the meter module to display the first circuit information; or to generate third loop control information based on the second circuit information, wherein the third loop control information is used to indicate the meter module to display the second circuit information.
[0009] The metering instrument module is used to receive first circuit information and second loop control information, and display the first circuit information according to the second loop control information; or, to receive second circuit information and third loop control information, and display the second circuit information according to the third loop control information.
[0010] In one possible implementation, the switching module includes a first power supply module, a second power supply module, and a data acquisition module, wherein,
[0011] The output port of the first power module is connected to the first input port of the acquisition module, and the output port of the second power module is connected to the second input port of the acquisition module.
[0012] In one possible implementation, the acquisition module includes a first power contactor, a second power contactor, a third power contactor, a fourth power contactor, a first control circuit, a second control circuit, a third control circuit, and a fourth control circuit. The first control circuit includes a first switch and a first relay; the second control circuit includes a second switch and a second relay; the third control circuit includes a third switch and a third relay; and the fourth control circuit includes a fourth switch and a fourth relay.
[0013] The input port of the first power contactor is connected to the first sub-output port of the first power module, and the output port of the first power contactor is connected to the first sub-input port of the junction box module. The input port of the second power contactor is connected to the first output port of the second power module, and the output port of the second power contactor is connected to the second sub-input port of the junction box module.
[0014] The input port of the third power contactor is connected to the second sub-output port of the first power module, the output port of the third power contactor is connected to the third sub-input port of the junction box module, the input port of the fourth power contactor is connected to the second sub-output port of the second power module, and the output port of the fourth power contactor is connected to the fourth sub-input port of the junction box module.
[0015] The first terminal of the first switch is connected to the 1L1 port of the third power contactor, the second terminal of the first switch is connected to the first terminal of the first relay, and the second terminal of the first relay is connected to the 1N port of the third power contactor.
[0016] The first end of the second switch is connected to the 2L1 port of the fourth power contactor, the second end of the second switch is connected to the first end of the second relay, and the second end of the second relay is connected to the 2N port of the fourth power contactor.
[0017] The first end of the third switch is connected to the 1L1 port of the third power contactor, the second end of the third switch is connected to the first end of the third relay, and the second end of the third relay is connected to the 1N port of the third power contactor.
[0018] The first end of the fourth switch is connected to the 2L1 port of the fourth power contactor, the second end of the fourth switch is connected to the first end of the fourth relay, and the second end of the fourth relay is connected to the 2N port of the fourth power contactor.
[0019] In one possible implementation, the first power module includes a main power supply terminal, a first current transformer, and a load terminal, wherein...
[0020] The output port of the main power supply is connected to the input port of the first current transformer, the first output port of the first current transformer is connected to the input port of the load, the second output port of the first current transformer is connected to the input port of the first power contactor, and the third output port of the first current transformer is connected to the input port of the third power contactor.
[0021] In one possible implementation, the first current transformer includes a first coil, a second coil, and a third coil, wherein,
[0022] The first end of the first coil is connected to the output port of the main power supply, the input port of the first power contactor, and the input port of the third power contactor; the second end of the first coil is connected to the input port of the load, the input port of the first power contactor, and the input port of the third power contactor.
[0023] The first end of the second coil is connected to the output port of the main power supply, the input port of the first power contactor, and the input port of the third power contactor; the second end of the second coil is connected to the input terminal of the load, the input port of the first power contactor, and the input port of the third power contactor.
[0024] The first end of the third coil is connected to the output port of the main power supply, the input port of the first power contactor, and the input port of the third power contactor; the second end of the third coil is connected to the input terminal of the load, the input port of the first power contactor, and the input port of the third power contactor.
[0025] The second end of the first coil is connected to the second end of the second coil and the second end of the third coil and grounded.
[0026] In one possible implementation, the second power module includes a backup power supply terminal, a second current transformer, and a load terminal, wherein...
[0027] The output port of the backup power supply is connected to the input port of the second current transformer, the first output port of the second current transformer is connected to the input port of the load, the second output port of the second current transformer is connected to the input port of the second power contactor, and the third output port of the second current transformer is connected to the input port of the fourth power contactor.
[0028] In one possible implementation, the second current transformer includes a fourth coil, a fifth coil, and a sixth coil, wherein,
[0029] The first end of the fourth coil is connected to the output port of the backup power supply, the input port of the second power contactor, and the input port of the fourth power contactor; the second end of the fourth coil is connected to the input port of the load, the input port of the second power contactor, and the input port of the fourth power contactor.
[0030] The first end of the fifth coil is connected to the output port of the backup power supply, the input port of the second power contactor, and the input port of the fourth power contactor; the second end of the fifth coil is connected to the input port of the load, the input port of the second power contactor, and the input port of the fourth power contactor.
[0031] The first end of the sixth coil is connected to the output end of the backup power supply, the input port of the second power contactor, and the input port of the fourth power contactor; the second end of the sixth coil is connected to the input end of the load, the input port of the second power contactor, and the input port of the fourth power contactor.
[0032] The second end of the fourth coil is connected to the second end of the fifth coil and the second end of the sixth coil and grounded.
[0033] In one possible implementation, the metering instrument module includes a DTSD188S three-phase four-wire multi-function electronic meter, and the load control terminal module includes an FKGA43-SX2710 load management terminal.
[0034] In a second aspect, embodiments of this application provide an automatic switching device, the automatic switching device including a circuit board and an automatic switching circuit for metering secondary current loops as described in any one of the first aspects, the automatic switching circuit for metering secondary current loops being disposed on the circuit board.
[0035] In a third aspect, embodiments of this application provide an automatic switching device, the automatic switching device including a housing and an automatic switching apparatus as described in the second aspect, the automatic switching apparatus being disposed inside the housing.
[0036] The automatic switching circuit for the secondary current metering loop provided in this application embodiment includes a metering instrument module, a load control terminal module, a junction box module, and a switching module. The output port of the switching module is connected to the input port of the junction box module. The first output port of the junction box module is connected to the input port of the metering instrument module, and the second output port of the junction box module is connected to the input port of the load control terminal module. The first output port of the load control terminal module is connected to the input port of the metering instrument module, and the second output port of the load control terminal module is connected to the input port of the switching module. The switching module is used to transmit first circuit information or second circuit information to the junction box module, and to receive first loop control information transmitted by the load control terminal module. It then switches between the main power supply circuit and the backup power supply circuit according to the first loop control information. The first circuit information includes voltage and current information in the main power supply circuit, and the second circuit information includes voltage information in the backup power supply circuit. The junction box module transmits the first circuit information to the metering instrument module and the load control terminal module, or transmits the second circuit information to the metering instrument module and the load control terminal module. The load control terminal module receives the first circuit information or the second circuit information and generates second loop control information based on the first circuit information. The second loop control information is used to instruct the metering instrument module to display the first circuit information. Alternatively, it generates third loop control information based on the second circuit information. The third loop control information is used to instruct the metering instrument module to display the second circuit information. The metering instrument module receives the first circuit information and the second loop control information and displays the first circuit information based on the second loop control information. Or, it receives the second circuit information and the third loop control information and displays the second circuit information based on the third loop control information. Therefore, the automatic switching between the main power supply and the backup power supply can be controlled by the first loop control information generated by the load control terminal module, thereby improving the switching efficiency of the secondary current loop. Attached Figure Description
[0037] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0038] Figure 1 This application provides a schematic diagram of the structure of an existing automatic switching circuit for secondary current loops.
[0039] Figure 2 This application provides a schematic diagram of the structure of an automatic switching circuit for metering secondary current loops.
[0040] Figure 3 This application provides a schematic diagram of the structure of a switching module.
[0041] Figure 4 This application provides a schematic diagram of the structure of a data acquisition module.
[0042] Figure 5 A schematic diagram of the structure of the first power module is provided for an embodiment of this application;
[0043] Figure 6 A schematic diagram of the structure of a first current transformer is provided for an embodiment of this application;
[0044] Figure 7 A schematic diagram of the structure of the second power module is provided for an embodiment of this application.
[0045] Figure 8 A schematic diagram of the structure of the second current transformer is provided for the embodiments of this application. Detailed Implementation
[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0047] It should be noted that, unless there is a conflict, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. Moreover, the terms "first," "second," and "third" used in this application do not limit the data or execution order, but only distinguish identical or similar items with essentially the same function and effect.
[0048] To better understand the display module driving circuit provided in the embodiments of this application, a brief introduction to the display module driving circuit in the prior art is first given. Figure 1 A schematic diagram of an automatic switching structure for an existing metering secondary current loop is shown, as follows: Figure 1As shown, it includes a first power module 101, a second power module 102, a junction box 103, a first control module 104, a second control module 105, a first metering module 106, and a second metering module 107. The first power module 101 and the second power module 101 are connected to the junction box 103. The junction box 103 is connected to both the first and second control modules 104 and 105. The first control module 104 is connected to the first metering module 106, and the second control module 105 is connected to the second metering module 107. Therefore, there are two control modules and two metering modules, resulting in a slow signal response during automatic switching of the secondary current loop, leading to low efficiency. To address this problem, this application provides an automatic switching circuit for metering secondary current loops. This circuit uses a metering instrument module, a load control terminal module, a junction box module, and a switching module to achieve secondary current loop switching, reducing the number of modules required for loop switching and the signal response time, thereby improving the efficiency of automatic switching of secondary current loops.
[0049] Please see Figure 2 , Figure 2 This application provides a schematic diagram of an automatic switching circuit for measuring secondary current loops. For example... Figure 2 As shown, the automatic switching circuit for the secondary current loop includes: metering instrument module 4, load control terminal module 3, junction box module 2, and switching module 1.
[0050] The output port of the switching module 1 is connected to the input port of the junction box module 2. The first output port of the junction box module 2 is connected to the input port of the metering instrument module 4. The second output port of the junction box module 2 is connected to the input port of the load control terminal module 3. The first output port of the load control terminal module 3 is connected to the input port of the metering instrument module 4. The second output port of the load control terminal module 3 is connected to the input port of the switching module 1.
[0051] The switching module 1 is used to transmit first circuit information or second circuit information to the junction box module 2, and to receive first circuit control information transmitted by the negative control terminal module 3, and to switch between the main power supply circuit and the backup power supply circuit according to the first circuit control information. The first circuit information includes voltage information and current information in the main power supply circuit, and the second circuit information includes voltage information and current information in the backup power supply circuit.
[0052] The junction box module 2 is used to transmit the first circuit information to the metering instrument module 4 and the load control terminal module 3, or to transmit the second circuit information to the metering instrument module 4 and the load control terminal module 3.
[0053] The load control terminal module 3 is used to receive first circuit information or second circuit information, and to generate second loop control information based on the first circuit information. The second loop control information is used by the indicator instrument module 4 to display the first circuit information; or to generate third loop control information based on the second circuit information. The third loop control information is used by the indicator instrument module 4 to display the second circuit information.
[0054] The metering instrument module 4 is used to receive first circuit information and second loop control information, and display the first circuit information according to the second loop control information; or, to receive second circuit information and third loop control information, and display the second circuit information according to the third loop control information.
[0055] The metering instrument module 4 can be a DTSD188S three-phase four-wire multi-function electronic meter, and the load control terminal module 3 can be an FKGA43-SX2710 load management terminal.
[0056] In one possible implementation, such as Figure 3 As shown, the switching module 1 includes a first power module 11, a second power module 12, and a data acquisition module 13, wherein...
[0057] The output port of the first power module 11 is connected to the first input port of the acquisition module 13, and the output port of the second power module 12 is connected to the second input port of the acquisition module 13.
[0058] In this example, the acquisition module 13 collects current and voltage information in the circuit, providing accurate data for subsequent judgment on whether to switch between the first power supply module and the second power supply module, thereby improving the efficiency of automatic switching of the secondary current circuit.
[0059] In one possible implementation, such as Figure 4 As shown, the acquisition module 13 includes a first power contactor 41, a second power contactor 42, a third power contactor 43, a fourth power contactor 44, a first control circuit 45, a second control circuit 46, a third control circuit 47, and a fourth control circuit 48. The first control circuit includes a first switch K1 and a first relay KA1; the second control circuit includes a second switch K2 and a second relay KA2; the third control circuit includes a third switch K3 and a third relay KA3; and the fourth control circuit includes a fourth switch K4 and a fourth relay KA4.
[0060] The input port of the first power contactor 41 is connected to the first sub-output port of the first power module 11, and the output port of the first power contactor 41 is connected to the first sub-input port of the junction box module 2. The input port of the second power contactor 42 is connected to the first output port of the second power module 12, and the output port of the second power contactor 42 is connected to the second sub-input port of the junction box module 2.
[0061] The input port of the third power contactor 43 is connected to the second sub-output port of the first power module 11, the output port of the third power contactor 43 is connected to the third sub-input port of the junction box module 2, the input port of the fourth power contactor 44 is connected to the second sub-output port of the second power module 12, and the output port of the fourth power contactor 44 is connected to the fourth sub-input port of the junction box module 2.
[0062] The first end of the first switch K1 is connected to the 1L1 port of the third power contactor 43, the second end of the first switch K1 is connected to the first end of the first relay KA1, and the second end of the first relay KA1 is connected to the 1N port of the third power contactor 43.
[0063] The first end of the second switch K2 is connected to the 2L1 port of the fourth power contactor 44, the second end of the second switch K2 is connected to the first end of the second relay KA2, and the second end of the second relay KA2 is connected to the 2N port of the fourth power contactor.
[0064] The first end of the third switch K3 is connected to the 1L1 port of the third power contactor 43, the second end of the third switch K3 is connected to the first end of the third relay KA3, and the second end of the third relay KA3 is connected to the 1N port of the third power contactor 43.
[0065] The first end of the fourth switch K4 is connected to the 2L1 port of the fourth power contactor 44, the second end of the fourth switch K4 is connected to the first end of the fourth relay KA4, and the second end of the fourth relay KA4 is connected to the 2N port of the fourth power contactor 44.
[0066] In this example, relays are used to control the opening and closing of the main power supply circuit and the backup power supply circuit, thereby achieving automatic switching between the main power supply circuit and the backup power supply circuit and improving the efficiency of automatic switching of the secondary current loop.
[0067] In one possible implementation, such as Figure 5 As shown, the first power module includes a main power supply terminal 51, a first current transformer 52, and a load terminal 53, wherein...
[0068] The output port of the main power supply terminal 51 is connected to the input port of the first current transformer 52, the first output port of the first current transformer 52 is connected to the input port of the load terminal 53, the second output port of the first current transformer 52 is connected to the input port of the first power contactor 41, and the third output port of the first current transformer 52 is connected to the input port of the third power contactor 43.
[0069] In one possible implementation, such as Figure 6 As shown, the first current transformer 52 includes a first coil TAa1, a second coil Tab1, and a third coil TAc1, wherein,
[0070] The first end as1 of the first coil TAa1 is connected to the output port of the main power supply terminal 51, the input port of the first power contactor, and the input port of the third power contactor 43. The second end as2 of the first coil TAa1 is connected to the input terminal of the load terminal 53, the input port of the first power contactor 41, and the input port of the third power contactor 43.
[0071] The first end as1 of the second coil Tab1 is connected to the output port of the main power supply terminal 51, the input port of the first power contactor 41, and the input port of the third power contactor 43. The second end as2 of the second coil Tab1 is connected to the input terminal of the load terminal 53, the input port of the first power contactor 41, and the input port of the third power contactor 43.
[0072] The first end as1 of the third coil TAc1 is connected to the output port of the main power supply terminal 51, the input port of the first power contactor 41, and the input port of the third power contactor 43. The second end as2 of the third coil TAc1 is connected to the input terminal of the load terminal 53, the input port of the first power contactor 41, and the input port of the third power contactor 43.
[0073] The second end as2 of the first coil TAa1 is connected to the second end as2 of the second coil Tab1 and the second end as2 of the second coil TAc1 and grounded.
[0074] In one possible implementation, such as Figure 7 As shown, the second power module includes a backup power supply terminal 71, a second current transformer 72, and a load terminal 73, wherein...
[0075] The output port of the backup power supply terminal 71 is connected to the input port of the second current transformer 72, the first output port of the second current transformer 72 is connected to the input port of the load terminal 73, the second output port of the second current transformer 72 is connected to the input port of the second power contactor 42, and the third output port of the second current transformer 72 is connected to the input port of the fourth power contactor 44.
[0076] In one possible implementation, such as Figure 8 As shown, the second current transformer 81 includes a fourth coil TAa2, a fifth coil Tab2, and a sixth coil TAc2, wherein,
[0077] The first end as1 of the fourth coil TAa2 is connected to the output port of the backup power supply, the input port of the second power contactor 42, and the input port of the fourth power contactor 44. The second end as2 of the fourth coil TAa2 is connected to the input terminal of the load, the input port of the second power contactor 42, and the input port of the fourth power contactor 44.
[0078] The first end as1 of the fifth coil Tab2 is connected to the output port of the backup power supply, the input port of the second power contactor 42, and the input port of the fourth power contactor 44. The second end as2 of the fifth coil Tab2 is connected to the input terminal of the load, the input port of the second power contactor 42, and the input port of the fourth power contactor 44.
[0079] The first end as1 of the sixth coil TAc2 is connected to the output end of the backup power supply 71, the input port of the second power contactor 42, and the input port of the fourth power contactor 44. The second end as2 of the sixth coil TAc2 is connected to the input end of the load end, the input port of the second power contactor 42, and the input port of the fourth power contactor 44.
[0080] The second end as2 of the fourth coil TAa2 is connected to the second end as2 of the fifth coil Tab2 and the second end as2 of the sixth coil TAc2 and grounded.
[0081] This application also provides an automatic switching device, which includes a circuit board and an automatic switching circuit for the metering secondary current loop as described in any of the foregoing embodiments, wherein the automatic switching circuit for the metering secondary current loop is disposed on the circuit board.
[0082] This application also provides an automatic switching device, which includes a housing and an automatic switching device as described in the foregoing embodiments, wherein the automatic switching device is disposed inside the housing.
[0083] The apparatus or device embodiments described above are merely illustrative. The unit modules described as separate components may or may not be physically separate, and the components shown as module units may or may not be physical units; that is, they may be located in one place or distributed across multiple network module units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0084] Through the above description of the embodiments, those skilled in the art can clearly understand that the method parts of each embodiment can be implemented by means of software plus a general-purpose hardware platform, or of course, by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.
[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. An automatic switching circuit for metering secondary current loops, characterized in that, Applied to electronic equipment, the automatic switching circuit of the metering secondary current loop includes: a metering instrument module, a load control terminal module, a junction box module, and a switching module, wherein... The output port of the switching module is connected to the input port of the junction box module. The first output port of the junction box module is connected to the input port of the metering instrument module. The second output port of the junction box module is connected to the input port of the load control terminal module. The first output port of the load control terminal module is connected to the input port of the metering instrument module. The second output port of the load control terminal module is connected to the input port of the switching module. The switching module is used to transmit first circuit information or second circuit information to the junction box module, and to receive first circuit control information transmitted by the negative control terminal module, and to switch between the main power supply circuit and the backup power supply circuit according to the first circuit control information. The first circuit information includes voltage information and current information in the main power supply circuit, and the second circuit information includes voltage information and current information in the backup power supply circuit. The junction box module is used to transmit the first circuit information to the metering instrument module and the load control terminal module, or to transmit the second circuit information to the metering instrument module and the load control terminal module. The load control terminal module is used to receive first circuit information or second circuit information, and to generate second loop control information based on the first circuit information, wherein the second loop control information is used to indicate the meter module to display the first circuit information; or to generate third loop control information based on the second circuit information, wherein the third loop control information is used to indicate the meter module to display the second circuit information. The metering instrument module is used to receive first circuit information and second loop control information, and display the first circuit information according to the second loop control information; or, to receive second circuit information and third loop control information, and display the second circuit information according to the third loop control information.
2. The automatic switching circuit for the metering secondary current loop according to claim 1, characterized in that, The switching module includes a first power module, a second power module, and a data acquisition module, wherein, The output port of the first power module is connected to the first input port of the acquisition module, and the output port of the second power module is connected to the second input port of the acquisition module.
3. The automatic switching circuit for the metering secondary current loop according to claim 2, characterized in that, The acquisition module includes a first power contactor, a second power contactor, a third power contactor, a fourth power contactor, a first control circuit, a second control circuit, a third control circuit, and a fourth control circuit. The first control circuit includes a first switch and a first relay; the second control circuit includes a second switch and a second relay; the third control circuit includes a third switch and a third relay; and the fourth control circuit includes a fourth switch and a fourth relay. The input port of the first power contactor is connected to the first sub-output port of the first power module, and the output port of the first power contactor is connected to the first sub-input port of the junction box module. The input port of the second power contactor is connected to the first output port of the second power module, and the output port of the second power contactor is connected to the second sub-input port of the junction box module. The input port of the third power contactor is connected to the second sub-output port of the first power module, the output port of the third power contactor is connected to the third sub-input port of the junction box module, the input port of the fourth power contactor is connected to the second sub-output port of the second power module, and the output port of the fourth power contactor is connected to the fourth sub-input port of the junction box module. The first terminal of the first switch is connected to the 1L1 port of the third power contactor, the second terminal of the first switch is connected to the first terminal of the first relay, and the second terminal of the first relay is connected to the 1N port of the third power contactor. The first end of the second switch is connected to the 2L1 port of the fourth power contactor, the second end of the second switch is connected to the first end of the second relay, and the second end of the second relay is connected to the 2N port of the fourth power contactor. The first end of the third switch is connected to the 1L1 port of the third power contactor, the second end of the third switch is connected to the first end of the third relay, and the second end of the third relay is connected to the 1N port of the third power contactor. The first end of the fourth switch is connected to the 2L1 port of the fourth power contactor, the second end of the fourth switch is connected to the first end of the fourth relay, and the second end of the fourth relay is connected to the 2N port of the fourth power contactor.
4. The automatic switching circuit for the metering secondary current loop according to claim 3, characterized in that, The first power module includes a main power supply terminal, a first current transformer, and a load terminal, wherein, The output port of the main power supply is connected to the input port of the first current transformer, the first output port of the first current transformer is connected to the input port of the load, the second output port of the first current transformer is connected to the input port of the first power contactor, and the third output port of the first current transformer is connected to the input port of the third power contactor.
5. The automatic switching circuit for the metering secondary current loop according to claim 4, characterized in that, The first current transformer includes a first coil, a second coil, and a third coil, wherein, The first end of the first coil is connected to the output port of the main power supply, the input port of the first power contactor, and the input port of the third power contactor; the second end of the first coil is connected to the input port of the load, the input port of the first power contactor, and the input port of the third power contactor. The first end of the second coil is connected to the output port of the main power supply, the input port of the first power contactor, and the input port of the third power contactor; the second end of the second coil is connected to the input terminal of the load, the input port of the first power contactor, and the input port of the third power contactor. The first end of the third coil is connected to the output port of the main power supply, the input port of the first power contactor, and the input port of the third power contactor; the second end of the third coil is connected to the input terminal of the load, the input port of the first power contactor, and the input port of the third power contactor. The second end of the first coil is connected to the second end of the second coil and the second end of the third coil and grounded.
6. The automatic switching circuit for the metering secondary current loop according to claim 5, characterized in that, The second power module includes a backup power supply terminal, a second current transformer, and a load terminal, wherein, The output port of the backup power supply is connected to the input port of the second current transformer, the first output port of the second current transformer is connected to the input port of the load, the second output port of the second current transformer is connected to the input port of the second power contactor, and the third output port of the second current transformer is connected to the input port of the fourth power contactor.
7. The automatic switching circuit for the metering secondary current loop according to claim 6, characterized in that, The second current transformer includes a fourth coil, a fifth coil, and a sixth coil, wherein, The first end of the fourth coil is connected to the output port of the backup power supply, the input port of the second power contactor, and the input port of the fourth power contactor; the second end of the fourth coil is connected to the input terminal of the load, the input port of the second power contactor, and the input port of the fourth power contactor. The first end of the fifth coil is connected to the output port of the backup power supply, the input port of the second power contactor, and the input port of the fourth power contactor; the second end of the fifth coil is connected to the input terminal of the load, the input port of the second power contactor, and the input port of the fourth power contactor. The first end of the sixth coil is connected to the output end of the backup power supply, the input port of the second power contactor, and the input port of the fourth power contactor; the second end of the sixth coil is connected to the input end of the load, the input port of the second power contactor, and the input port of the fourth power contactor. The second end of the fourth coil is connected to the second end of the fifth coil and the second end of the sixth coil and grounded.
8. The automatic switching circuit for the metering secondary current loop according to claim 7, characterized in that, The metering instrument module includes a DTSD188S three-phase four-wire multi-function electronic meter, and the load control terminal module includes an FKGA43-SX2710 load management terminal.
9. An automatic switching device, characterized in that, The automatic switching device includes a circuit board and an automatic switching circuit for metering secondary current loops as described in any one of claims 1-8, wherein the automatic switching circuit for metering secondary current loops is disposed on the circuit board.
10. An automatic switching device, characterized in that, The automatic switching device includes a housing and an automatic switching apparatus as described in claim 9, wherein the automatic switching apparatus is disposed inside the housing.