A power switching circuit, a power supply and a power device

Abstract

The application discloses a power supply switching circuit, a power supply and a power device, and belongs to the technical field of power supply circuits, wherein the power supply switching circuit comprises a first switching module and a second switching module. The first switching module comprises a first controller, a first transmission path and a first interlocking path, and the first controller controls the conduction and shutdown of the first transmission path and the first interlocking path; the second switching module comprises a second controller, a second transmission path and a second interlocking path, and the second controller controls the conduction and shutdown of the second transmission path and the second interlocking path. By introducing the interlocking mechanism, it is ensured that the first transmission path and the second transmission path cannot be conducted at the same time, the two power supplies are prevented from supplying power at the same time, the impact current caused by the phase difference is reduced, and the stability and reliability of the power supply switching are improved.

Description

Technical Field

[0001] This application relates to the field of power supply circuit technology, and in particular to a power switching circuit, a power supply, and a power device. Background Technology

[0002] The reliability and stability of power sources are crucial for ensuring the continuity of power supply and the normal operation of systems involving power equipment. To improve the reliability and stability of power sources, power systems are typically configured with a primary power source and a backup power source. When the primary power source fails, the power system switches to the backup power source to ensure that equipment continues to receive power and to avoid power outages or equipment damage caused by power failures.

[0003] However, existing power switching circuits may cause instantaneous current surges during the switching process due to the phase difference between the two power supplies, which could damage the equipment. Utility Model Content

[0004] This application provides a power switching circuit, a power supply, and a power device, which aims to improve the stability and reliability of the power switching process, prevent instantaneous current surges caused by phase differences during power switching, thereby ensuring the continuity of power supply and avoiding equipment damage or system failure.

[0005] To achieve the above objectives, in a first aspect, a power switching circuit is provided, comprising:

[0006] The first switching module includes a first controller, a first transmission path and a first interlock path. The first controller controls the conduction and shutdown of the first transmission path and the first interlock path. The first transmission path is used to couple between a first power supply and a power transmission port. The first terminal of the first controller is coupled to the first terminal of the first power supply.

[0007] The second switching module includes a second controller, a second transmission path, and a second interlock path. The second controller controls the conduction and shutdown of the second transmission path and the second interlock path. The second transmission path is used to couple between the second power supply and the power transmission port. The second terminal of the second controller is coupled to the second terminal of the second power supply.

[0008] The first interlocking path is coupled between the first terminal of the second power supply and the first terminal of the second controller, and the second interlocking path is coupled between the second terminal of the first power supply and the second terminal of the first controller.

[0009] The first switch module and the second switch module are configured as follows:

[0010] When the first power supply is in operation, the first controller controls the first transmission path to be turned on and controls the first interlock path to be turned off.

[0011] When the first power supply is de-energized and the second power supply is energized, the first controller controls the first transmission path to shut down and controls the first interlock path to open, and the second controller controls the second interlock path to shut down and the second transmission path to open.

[0012] Optionally, the first controller includes a first drive coil, the first transmission path includes a first normally open switch, and the first interlock path includes a first normally closed switch.

[0013] The first switch module is configured such that when the first power supply is powered, current flows through the second interlocking path through the first drive coil, the first drive coil drives the first normally open switch to close, and drives the first normally closed switch to open.

[0014] Optionally, the power transmission port includes a positive transmission terminal and a negative transmission terminal, and the first transmission path includes:

[0015] The first negative terminal path is used to couple between the second terminal of the first power supply and the negative transmission terminal;

[0016] The first positive terminal is used to couple between the first terminal of the first power supply and the positive transmission terminal;

[0017] Both the first positive electrode path and the first negative electrode path have the first normally open switch.

[0018] Optionally, it further includes: a first switch for coupling between a second terminal of the first power supply and the first negative terminal path; and a second switch for coupling between a first terminal of the first power supply and the first positive terminal path.

[0019] Optionally, the second controller includes a second drive coil, the second transmission path includes a second normally open switch, and the second interlock path includes a second normally closed switch.

[0020] The second switch module is configured such that when the first power supply is de-energized and the second power supply is energized, the first normally closed switch closes, current flows through the first interlocking path through the second drive coil, the second drive coil drives the second normally open switch to close, and drives the second normally closed switch to open.

[0021] Optionally, the power transmission port includes a positive transmission terminal and a negative transmission terminal, and the second transmission path includes:

[0022] The second negative terminal path is used to couple between the second terminal of the second power supply and the negative terminal transmission terminal;

[0023] The second positive terminal is used to couple between the first terminal of the second power supply and the positive transmission terminal;

[0024] The second normally open switch is present on both the second positive electrode path and the second negative electrode path.

[0025] Optionally, it further includes: a third switch for coupling between the second terminal of the second power supply and the second negative terminal path; and a fourth switch for coupling between the first terminal of the second power supply and the second positive terminal path.

[0026] Secondly, a power supply is also proposed, including:

[0027] Includes the power switching circuit described in any of the above disclosures;

[0028] A first power supply is coupled to the first switch module;

[0029] The second power supply is coupled to the second switching module.

[0030] Optionally, both the first power source and the second power source are AC or DC power sources.

[0031] Thirdly, an electrical device is also proposed, including an electrical device coupled to the power supply described in any of the above.

[0032] The above technical solution introduces an interlock mechanism. When no current flows through the first controller, the first interlock circuit is in a conducting state; when no current flows through the second controller, the second interlock circuit is in a conducting state. By controlling the energization state of the first and second controllers through the first and second interlock circuits, it ensures that the first and second transmission circuits will not be simultaneously activated, avoiding the situation where two power sources supply power at the same time. This reduces the inrush current caused by phase difference, improves the stability and reliability during power switching, ensures the continuity of power supply, and prevents equipment damage or system failure. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1This is a schematic diagram of the power switching circuit disclosed in the embodiments of this application;

[0035] Figure 2 This is a schematic diagram of the power supply structure disclosed in the embodiments of this application.

[0036] Explanation of icon numbers:

[0037] 1. First switch module; 11. First controller; 12. First transmission path; 121. First negative path; 122. First positive path; 13. First interlock path;

[0038] 2. Second switch module; 21. Second controller; 22. Second transmission path; 221. Second negative path; 222. Second positive path; 23. Second interlock path;

[0039] 3. First power supply; 4. Second power supply;

[0040] 5. Power transmission port; 51. Negative transmission terminal; 52. Positive transmission terminal;

[0041] K1, First normally open switch; K2, First normally closed switch; K3, Second normally open switch; K4, Second normally closed switch; S1, First switch; S2, Second switch; S3, Third switch; S4, Fourth switch.

[0042] The realization of the objectives, functional features and advantages of the embodiments of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] Furthermore, descriptions involving "first," "second," etc., in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0045] As described in the background section, the reliability and stability of power supply are crucial for ensuring the continuity of power supply and the normal operation of systems involved in power equipment. To improve the reliability and stability of power supply, power systems are typically configured with a primary power source and a backup power source. When the primary power source fails, the power system switches to the backup power source to ensure that the equipment continues to receive power and avoids power outages or equipment damage caused by power failures.

[0046] In existing technologies, power switching circuits typically include two contactors, coupled to the main power supply and the backup power supply respectively. These contactors control the switching of power sources. When one power source fails, the other is switched to the load side via the contactor, ensuring uninterrupted power supply. However, AC power sources in power systems often exhibit phase differences, meaning there is a time difference between the current waveforms of the two power sources. When switching power sources in existing circuits, if the phases of the two power sources are inconsistent, a momentary current surge (inrush current) will occur during the switching process. This inrush current can cause electrical stress on equipment, potentially damaging it or leading to system instability. Furthermore, existing power switching circuits typically use normally open contactors. During switching, the contactor contacts may stick or become poorly connected, affecting the reliability and stability of the power switching. Finally, existing power switching circuits generally lack interlocking functionality, which could lead to the simultaneous connection of both power sources during maintenance or repair, posing a safety risk.

[0047] Therefore, in order to improve the stability and reliability of the power switching process and prevent problems such as instantaneous current surges, contact sticking, or poor contact caused by phase differences during power switching, thereby ensuring the continuity of power supply and avoiding equipment damage or system failure, this application discloses a power switching circuit.

[0048] Reference Figure 1This application discloses a power switching circuit including a first switching module 1 and a second switching module 2. The first switching module 1 includes a first controller 11, a first transmission path 12, and a first interlocking path 13. The first controller 11 controls the on / off state of the first transmission path 12 and the first interlocking path 13. The first transmission path 12 is coupled between a first power supply 3 and a power transmission port 5, and the first terminal of the first controller 11 is coupled to the first terminal of the first power supply 3. The second switching module 2 includes a second controller 21, a second transmission path 22, and a second interlocking path 23. The second controller 21 controls the on / off state of the second transmission path 22 and the second interlocking path 23. The second transmission path 22 is coupled between a second power supply 4 and a power transmission port 5, and the second terminal of the second controller 21 is coupled to the second terminal of the second power supply 4. Further, the first interlocking path 13 is coupled between the first terminal of the second power supply 4 and the first terminal of the second controller 21, and the second interlocking path 23 is coupled between the second terminal of the first power supply 3 and the second terminal of the first controller 11.

[0049] The first switch module 1 and the second switch module 2 are configured such that: when the first power supply 3 supplies power, the first controller 11 controls the first transmission path 12 to be turned on and controls the first interlock path 13 to be turned off; when the first power supply 3 is de-energized and the second power supply 4 supplies power, the first controller 11 controls the first transmission path 12 to be turned off and controls the first interlock path 13 to be turned on, the second controller 21 controls the second interlock path 23 to be turned off and the second transmission path 22 to be turned on.

[0050] In this embodiment, an interlocking mechanism is introduced. When no current flows through the first controller 11, the first interlocking path 13 is in a conducting state; when no current flows through the second controller 21, the second interlocking circuit is in a conducting state. By controlling the energizing state of the first controller 11 and the second controller 21 through the first interlocking path 13 and the second interlocking path 23, it is ensured that the first transmission path 12 and the second transmission path 22 will not be simultaneously activated, avoiding the situation where two power sources supply power at the same time. This reduces the inrush current caused by the phase difference, improves the stability and reliability during power switching, ensures the continuity of power supply, and avoids equipment damage or system failure.

[0051] In this embodiment, the first controller 11 includes a first drive coil, the first transmission path 12 includes a first normally open switch K1, and the first interlock path 13 includes a first normally closed switch K2. The second controller 21 includes a second drive coil, the second transmission path 22 includes a second normally open switch K3, and the second interlock path 23 includes a second normally closed switch K4.

[0052] The first switch module 1 is configured such that when the first power supply 3 is powered, current flows through the second normally closed switch K4 and the first drive coil, which in turn drives the first normally open switch K1 to close and the first normally closed switch K2 to open. The second switch module 2 is configured such that when the first power supply 3 is de-energized and the second power supply 4 is powered, the first normally closed switch K2 closes, current flows through the first interlocking path 13 and the second drive coil, the second normally open switch K3 closes, and the second normally closed switch K4 opens.

[0053] In existing technologies, normally open contactors are typically used for power switching. Normally open contactors require current flow to close their contacts. However, during switching, the contactors' contacts are prone to sticking or poor contact, leading to unreliability and instability in the power switching process. In this embodiment, normally closed switches are provided on both the first interlocking path 13 and the second interlocking path 23. The first normally closed switch K2 remains closed when the first controller 11 is not energized, and the second normally closed switch K4 remains closed when the second controller 21 is not energized. The design of the normally closed switches can reliably close to avoid sticking or poor contact problems. This ensures that when the first power supply 3 is powered, current can flow through the second normally closed switch K4 through the first controller 11, causing the first controller 11 to drive the first transmission path 12 to conduct; and that when the second power supply 4 is powered, current can flow through the first normally closed switch K2 through the second controller 21, causing the second controller 21 to drive the second transmission path 22 to conduct. The reliable closing of the normally closed switches helps ensure the stability and reliability of the switching circuit, effectively avoiding switching failures caused by contactor malfunctions (such as contact sticking).

[0054] Furthermore, the power transmission port 5 includes a negative transmission terminal 51 and a positive transmission terminal 52. In this embodiment, the first terminal of the first power supply 3 is the positive terminal, the second terminal of the first power supply 3 is the negative terminal, the first terminal of the second power supply 4 is the positive terminal, and the second terminal of the second power supply 4 is the negative terminal. In some other embodiments, the first terminal of the first power supply 3 is the negative terminal, the second terminal of the first power supply 3 is the positive terminal, the first terminal of the second power supply 4 is the negative terminal, and the second terminal of the second power supply 4 is the positive terminal.

[0055] In this embodiment, the first transmission path 12 includes a first negative path 121 and a first positive path 122. The first negative path 121 is used to couple between the second terminal of the first power supply 3 and the negative transmission terminal 51, and the first positive path 122 is used to couple between the first terminal of the first power supply 3 and the positive transmission terminal 52. Both the first negative path 121 and the first positive path 122 have a first normally open switch K1.

[0056] The second transmission path 22 includes a second negative path 221 and a second positive path 222. The second negative path 221 is used to couple between the second terminal of the second power supply 4 and the negative transmission terminal 51. The second positive path 222 is used to couple between the first terminal of the second power supply 4 and the positive transmission terminal 52; wherein, both the second negative path 221 and the second positive path 222 have a second normally open switch K3.

[0057] In this embodiment, the power switching circuit further includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. The first switch S1 is coupled between the second terminal of the first power supply 3 and the first negative terminal path 121. The second switch S2 is coupled between the first terminal of the first power supply 3 and the first positive terminal path 122. The third switch S3 is coupled between the second terminal of the second power supply 4 and the second negative terminal path 221. The fourth switch S4 is coupled between the first terminal of the second power supply 4 and the second positive terminal path 222.

[0058] In this application, a switch is provided between the transmission path and the power supply. When the power switching circuit is operating normally, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all closed. When maintenance is required on the circuit or the load side, the power supply can be effectively isolated by turning off the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4, thus ensuring the safety of the maintenance operation.

[0059] Reference Figure 2 This application also discloses a power supply, including: a power switching circuit comprising any of the above-disclosed components, a first power supply 3, and a second power supply 4. The first power supply 3 is coupled to a first switching module 1; the second power supply 4 is coupled to a second switching module 2.

[0060] In some embodiments, both the first power source 3 and the second power source 4 are AC power sources. In some other embodiments, both the first power source 3 and the second power source 4 are DC power sources.

[0061] This application also discloses an electrical device, which includes an electrical device coupled to a power supply that is used to supply power to the electrical device.

[0062] The above are merely optional embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A power switching circuit, characterized in that, include: The first switch module (1) includes a first controller (11), a first transmission path (12) and a first interlock path (13). The first controller (11) controls the conduction and shutdown of the first transmission path (12) and the first interlock path (13). The first transmission path (12) is used to couple between the first power supply (3) and the power transmission port (5). The first end of the first controller (11) is coupled to the first end of the first power supply (3). The second switch module (2) includes a second controller (21), a second transmission path (22), and a second interlock path (23). The second controller (21) controls the conduction and shutdown of the second transmission path (22) and the second interlock path (23). The second transmission path (22) is used to couple between the second power supply (4) and the power transmission port (5). The second end of the second controller (21) is coupled to the second end of the second power supply (4). The first interlocking path (13) is coupled between the first end of the second power supply (4) and the first end of the second controller (21), and the second interlocking path (23) is coupled between the second end of the first power supply (3) and the second end of the first controller (11); The first switch module (1) and the second switch module (2) are configured as follows: When the first power supply (3) supplies power, the first controller (11) controls the first transmission path (12) to be turned on and controls the first interlock path (13) to be turned off; When the first power supply (3) is de-energized and the second power supply (4) is energized, the first controller (11) controls the first transmission path (12) to shut down and controls the first interlock path (13) to open, and the second controller (21) controls the second interlock path (23) to shut down and controls the second transmission path (22) to open.

2. The power switching circuit as described in claim 1, characterized in that, The first controller (11) includes a first drive coil, the first transmission path (12) includes a first normally open switch K1, and the first interlock path (13) includes a first normally closed switch K2. The first switch module (1) is configured such that when the first power supply (3) supplies power, the current flows through the second interlocking path (23) through the first drive coil, and the first drive coil drives the first normally open switch K1 to close and drives the first normally closed switch K2 to open.

3. The power switching circuit as described in claim 2, characterized in that, The power transmission port (5) includes a positive transmission terminal (52) and a negative transmission terminal (51), and the first transmission path (12) includes: The first negative terminal path (121) is used to couple between the second end of the first power supply (3) and the negative terminal transmission (51); A first positive terminal path (122) is used to couple between the first terminal of the first power supply (3) and the positive transmission terminal (52); Both the first negative electrode path (121) and the first positive electrode path (122) have the first normally open switch K1.

4. The power switching circuit as described in claim 3, characterized in that, Also includes: The first switch S1 is used to couple between the second terminal of the first power supply (3) and the first negative terminal path (121); The second switch S2 is used to couple between the first terminal of the first power supply (3) and the first positive terminal path (122).

5. The power switching circuit as described in claim 2, characterized in that, The second controller (21) includes a second drive coil, the second transmission path (22) includes a second normally open switch K3, and the second interlock path (23) includes a second normally closed switch K4; The second switch module (2) is configured such that when the first power supply (3) is de-energized and the second power supply (4) is energized, the first normally closed switch K2 is closed, and the current flows through the first interlocking path (13) through the second drive coil. The second drive coil drives the second normally open switch K3 to close and drives the second normally closed switch K4 to open.

6. The power switching circuit as described in claim 5, characterized in that, The power transmission port (5) includes a positive transmission terminal (52) and a negative transmission terminal (51), and the second transmission path (22) includes: The second negative terminal path (221) is used to couple between the second terminal of the second power supply (4) and the negative terminal transmission (51); The second positive terminal path (222) is used to couple between the first end of the second power supply (4) and the positive transmission terminal (52); The second negative electrode path (221) and the second positive electrode path (222) each have the second normally open switch K3.

7. The power switching circuit as described in claim 6, characterized in that, Also includes: The third switch S3 is used to couple between the second terminal of the second power supply (4) and the second negative terminal path (221); The fourth switch S4 is used to couple between the first terminal of the second power supply (4) and the second positive terminal path (222).

8. A power supply, characterized in that, include: Includes the power switching circuit described in any one of claims 1 to 7; The first power supply (3) is coupled to the first switch module (1); The second power supply (4) is coupled to the second switch module (2).

9. The power supply as described in claim 8, characterized in that, Both the first power source (3) and the second power source (4) are AC or DC power sources.

10. An electrical device, characterized in that, Includes electrical equipment coupled to the power supply as described in any one of claims 8-9.

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