Dual power transfer switch
By combining the characteristics of mechanical and solid-state dual power transfer switches, a fast power switching is achieved using a drive mechanism and an electromagnetic actuator, solving the problems of conversion speed and cost, and realizing low power consumption and high reliability power conversion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SCHNEIDER ELECTRIC IND SAS
- Filing Date
- 2024-12-11
- Publication Date
- 2026-06-12
AI Technical Summary
Existing mechanical dual power transfer switches have a slow switching speed, while solid-state dual power transfer switches are expensive and consume a lot of power, making it difficult to find a balance between fast switching and cost control.
Design a dual power transfer switch that combines the features of mechanical and solid-state types. It uses first and second switches and power electronic switches connected in parallel, and achieves rapid switching through a drive mechanism and an electromagnetic actuator. Power switching control is achieved using IGBTs and fuses.
It achieves a fast conversion speed of less than 10ms, while reducing the number of IGBTs used, reducing costs, and features low power consumption and high reliability, as well as complete isolation between power supplies.
Smart Images
Figure CN122202079A_ABST
Abstract
Description
Technical Field
[0001] This application relates to a dual power transfer switch. Background Technology
[0002] A dual power transfer switch is a switch used to switch between a primary power source and a backup power source. Dual power transfer switches are generally classified as mechanical or solid-state. Solid-state dual power transfer switches use power electronic switches (such as IGBTs), offering very fast switching speeds, typically in the microsecond range. However, IGBTs themselves have limited overload capacity, often requiring very large IGBTs, leading to high costs. Furthermore, solid-state dual power transfer switches have higher power consumption, necessitating complex heat dissipation designs such as air cooling or liquid cooling.
[0003] Mechanical dual-power transfer switches have a relatively slow switching speed. However, their advantages include low power consumption, low cost, and high reliability. They also have good heat dissipation, requiring no air or water cooling to achieve a relatively high rated current.
[0004] Therefore, there is a need to develop a dual power supply transfer switch that has a fast switching speed (e.g., within 10ms) without incurring excessive costs. Summary of the Invention
[0005] To overcome the above problems, this application provides a dual power supply transfer switch configured to switch between a first power supply and a second power supply. The dual power supply transfer switch includes:
[0006] A first switch has a first movable contact configured to rotate between a first position and a second position. In the first position, the first movable contact is connected to a first stationary contact for a first power supply, and in the second position, the first movable contact is connected to a second stationary contact for a second power supply.
[0007] The second switch and the power electronic switch are connected in parallel and then connected in series with the first switch. The second switch has a second moving contact, which is configured to switch between a closed position and an open position. The power electronic switch is configured to switch between an on state and an off state.
[0008] The drive mechanism is configured to drive the first moving contact to switch between a first position and a second position, and to drive the second moving contact to switch between a closed position and an open position.
[0009] In the first power supply operating mode of the dual power supply transfer switch, the first moving contact is in the first position, the second moving contact is in the closed position, and the power electronic switch is in the off state.
[0010] In the second power supply operating mode of the dual power supply transfer switch, the first moving contact is in the second position, the second moving contact is in the closed position, and the power electronic switch is in the off state.
[0011] During the switching of the dual power supply transfer switch from the first power supply operating mode to the second power supply operating mode, the power electronic switch first switches to the ON state, then the drive mechanism drives the second moving contact to switch from the closed position to the OFF position, then the power electronic switch switches to the OFF state, the drive mechanism drives the first moving contact to switch from the first position to the second position, and drives the second moving contact to switch from the OFF position back to the OFF position.
[0012] Advantageously, the drive mechanism includes:
[0013] The spindle is rotatably disposed within the housing of the dual power transfer switch and configured to rotate under the action of the main spring drive assembly, which is switchable between a first state and a second state. In the first state, the main spring drive assembly is configured to provide a biasing force that pivots the spindle in a first direction, and in the second state, the main spring drive assembly is configured to provide a biasing force that pivots the spindle in a second direction opposite to the first direction.
[0014] The first bracket is fixedly installed on the spindle and supports the first moving contact.
[0015] The second bracket is rotatably mounted inside the housing of the dual power transfer switch and carries the second moving contact;
[0016] A locking assembly, connected between the spindle and the second support, is configured to switch between a locked state and an unlocked state. In the locked state, the locking assembly locks the second support to keep the second moving contact in the closed position. In the unlocked state, the locking assembly allows the second support to move the second moving contact to the open position.
[0017] Advantageously, the drive mechanism further includes a locking member rotatably disposed within the housing of the dual power transfer switch, configured to rotate between a locked position and an unlocked position. In the locked position, the locking member abuts against the spindle to prevent the spindle from rotating, and in the unlocked position, the locking member disengages from the spindle and allows the spindle to rotate.
[0018] Advantageously, the drive mechanism includes a first actuator configured to switch the locking component from a locked state to an unlocked state, the locking component and the second bracket forming a four-bar linkage.
[0019] Advantageously, the drive mechanism includes a second actuator configured to actuate the locking member to rotate between a locked position and an unlocked position.
[0020] Advantageously, the drive mechanism also includes a tension spring configured to provide a biasing force that moves the second support toward the disconnected position.
[0021] Advantageously, the locking component includes:
[0022] The first rod, one end of which is connected to the first actuator, is pivotally mounted in the housing at the first pivot point;
[0023] The second rod has one end pivotally connected to the main shaft and the other end is provided with an opening slot, in which the first pin of the first rod is accommodated;
[0024] The third rod has one end pivotally connected to the other end of the first rod, and the other end of the third rod is connected to the second bracket. A groove is provided on the other end of the third rod, and the second pin of the second bracket is accommodated in the groove.
[0025] In the locked state, the first and third levers are in the first position and configured to provide a locking force that counteracts the biasing force of the tension spring to lock the second bracket.
[0026] In the unlocked state, the first and third levers are in the second position and configured not to provide locking force.
[0027] Advantageously, when the first actuator pulls the first rod to pivot, the first rod drives the third rod to pivot, causing the first and third rods to switch from the first posture to the second posture, thereby eliminating the locking force. Then, the second bracket drives the second moving contact to rotate toward the disconnected position under the biasing force of the tension spring.
[0028] Advantageously, during the switching of the dual power supply changeover switch from the first power supply operating mode to the second power supply operating mode, after the power electronic switch switches to the ON state, the first actuator switches the locking component from the locked state to the unlocked state, causing the first and third levers to switch from the first posture to the second posture, thereby allowing the second bracket to move the second moving contact to the OFF position. Then, the second actuator switches the locking element from the locked position to the unlocked position, and the main shaft rotates in the first direction under the action of the main spring drive assembly, thereby driving the first bracket and then the first moving contact to rotate from the first position to the second position, and at the same time driving the second lever to rotate, so that the second lever abuts against the first pin through the opening slot, causing the first and third levers to switch towards the first posture, pushing the second bracket to drive the second moving contact to the closed position, so that the second switch is closed. Then, the continued rotation of the main shaft drives the first bracket to rotate to the second position and simultaneously drives the second lever to pivot. At this time, the first pin of the first lever moves relative to the opening slot of the second lever. Then, the main spring drive assembly switches to the second state.
[0029] Advantageously, the dual power transfer switch also includes a fuse, which is connected in series with the power electronic switch and then in parallel with the second switch.
[0030] Advantageously, it also includes a detection device electrically connected to the main circuit of the dual-power transfer switch, configured to detect the presence of current in the main circuit of the dual-power transfer switch after the power electronic switch switches from the on state to the off state.
[0031] When the detection device does not detect current in the main circuit, the drive mechanism starts to drive the first moving contact to switch from the first position to the second position, and drives the second moving contact to switch from the open position back to the closed position.
[0032] Advantageously, the power electronic switch is an IGBT.
[0033] Advantageously, the first actuator and the second actuator are electromagnetic actuators.
[0034] Advantageously, the main spring drive assembly includes:
[0035] A pivot rod, pivotally mounted on the housing;
[0036] The first bearing rod has a first long groove at one end, a first column passes through the first long groove and is fixed to the housing, and the other end is pivotally mounted to the pivot rod via a first pivot column, the first pivot column abutting a portion of the main shaft;
[0037] The second bearing rod has a second long groove at one end, through which a second column passes and is fixed to the housing, and at the other end is pivotally mounted to the pivot rod via a second pivot column, which abuts against another part of the main shaft;
[0038] The first main spring is located between the first column and the first pivot column;
[0039] The second main spring is located between the second column and the second pivot column.
[0040] The first main spring and the second main spring are configured to provide a biasing force via the first pivot post in a first state to pivot the main shaft in a first direction, and via the second pivot post in a second state to pivot the main shaft in a second direction opposite to the first direction.
[0041] Advantageously, the locking component includes:
[0042] A hook-like element, connected to a first actuator, is configured to pivot between a hooked position and a released position when actuated by the first actuator. In the hooked position, the hook-like element hooks onto a second support to prevent the second support from moving toward a disconnected position under the action of a tension spring. In the released position, the hook-like element disengages from the hook on the second support.
[0043] A connecting rod, which connects the first bracket and the main shaft, has a third long slot into which the third pin of the first bracket is inserted. Attached Figure Description
[0044] The above and other features and advantages of exemplary embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, which are for illustrative purposes only and are not intended to limit the scope of the invention in any way, wherein:
[0045] Figure 1 A schematic diagram of a dual power supply transfer switch according to this application is shown. In this mode, the dual power supply transfer switch is in the first power supply operating mode. At this time, the first moving contact is in the first position, the second moving contact is in the closed position, and the power electronic switch is in the off state.
[0046] Figure 2 Showing the corresponding Figure 1 The circuit diagram.
[0047] Figure 3 A schematic diagram of a dual power supply changeover switch according to this application is shown. At this time, the power electronic switch is in the ON state, the locking component of the drive mechanism is in the OFF state, and the second bracket drives the second moving contact to the OFF position.
[0048] Figure 4 Showing the corresponding Figure 3 The circuit diagram.
[0049] Figure 5 A schematic diagram of a dual power supply changeover switch according to this application is shown, in which the second actuator switches the locking element to the unlocked position.
[0050] Figure 6 A schematic diagram of a dual power supply changeover switch according to this application is shown, in which the spindle drives the first bracket and the first moving contact to move from the first position toward the second position.
[0051] Figure 7 Showing the corresponding Figure 6 The circuit diagram.
[0052] Figure 8 A schematic diagram of a dual power supply changeover switch according to this application is shown, in which the spindle switches the locking assembly from the unlocked state to the locked state and moves the second bracket and the second moving contact to the closed position.
[0053] Figure 9 Showing the corresponding Figure 8 The circuit diagram.
[0054] Figure 10 A schematic diagram of a dual power supply changeover switch according to this application is shown, in which the spindle continues to rotate, causing the first bracket and the first moving contact to move to the second position.
[0055] Figure 11 Showing the corresponding Figure 10 The circuit diagram.
[0056] Figure 12 A schematic diagram of a dual power supply changeover switch according to this application is shown, in which the main spring assembly switches to the second state.
[0057] Figure 13 A schematic diagram of a dual power transfer switch according to another embodiment of this application is shown, wherein different locking components are present. Detailed Implementation
[0058] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0059] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.
[0060] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, terms such as “a,” “the,” and “described” do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative orientations when the equipment is in use or as shown in the accompanying drawings; these relative orientations may change accordingly when the absolute position of the described object changes.
[0061] Figure 1A schematic diagram of a dual power supply transfer switch according to this application is shown, in which the dual power supply transfer switch is in the first power supply operating mode. In the description of this application, for the sake of simplicity, the electrical connections between the first power supply, the second power supply, and the load are shown in a simplified form.
[0062] The dual power supply transfer switch is configured to switch between a first power supply S1 and a second power supply S2. In the first power supply operating mode, the first power supply S1 and the load L form a main circuit and are connected, and the first power supply S1 supplies power to the load. In the second power supply operating mode, the second power supply S2 and the load L form a main circuit and are connected, and the second power supply S2 supplies power to the load.
[0063] exist Figure 1 The electrical connections between the first power supply S1, the second power supply S2, and the load L are schematically shown in the figures and will not be shown again in the following figures to make the figures clearer.
[0064] like Figure 2 As shown, the dual power supply transfer switch includes a first switch K1 with a first moving contact 3, which is configured to rotate between a first position and a second position. In the first position, the first moving contact is connected to a first stationary contact for a first power supply, and in the second position, the first moving contact is connected to a second stationary contact for a second power supply.
[0065] The second switch K2 and the power electronic switch K3 are connected in parallel and in series with the first switch K1. The second switch has a second moving contact 4, which is configured to switch between a closed position and an open position. The power electronic switch is configured to switch between an on state and an off state. In the embodiments of this application, the power electronic switch is an IGBT; however, those skilled in the art will understand that the power electronic switch can also be in other forms, as long as it can achieve electronic switching of current.
[0066] The drive mechanism 1 is configured to drive the first moving contact to switch between a first position and a second position, and to drive the second moving contact to switch between a closed position and an open position.
[0067] like Figure 1 and 2As shown, the dual power transfer switch is in the first power supply operating mode. In this mode, the first moving contact is in the first position, the second moving contact is in the closed position, and the power electronic switch is in the off state, allowing the first power supply S1 to supply power to the load. During the switchover from the first power supply operating mode to the second power supply operating mode, the power electronic switch K3 first switches to the on state, causing current to flow through K3 but not through the second switch K2. Next, the drive mechanism 1 drives the second moving contact from the closed position to the open position, then the power electronic switch switches to the off state. Following this, the drive mechanism 1 drives the first moving contact from the first position to the second position, and then drives the second moving contact from the open position back to the closed position.
[0068] See Figure 1 The drive mechanism 1 includes a main shaft 11 rotatably disposed within the housing of a dual-power transfer switch and configured to rotate under the action of a main spring drive assembly 2. The main spring drive assembly 2 is switchable between a first state and a second state. In the first state, the main spring drive assembly is configured to provide a biasing force that pivots the main shaft in a first direction; in the second state, the main spring drive assembly is configured to provide a biasing force that pivots the main shaft in a second direction opposite to the first direction. The form of the main spring drive assembly is well known to those skilled in the art, and it is used to rotate the main shaft. Specifically, the main spring drive assembly 2 includes a pivot rod 21, which is pivotally mounted on the housing; a first support rod 22, one end of which has a first elongated groove 221, through which a first post 222 passes and is fixed to the housing, and the other end of which is pivotally mounted to the pivot rod 21 via a first pivot post 223, the first pivot post 223 abutting against a portion of the main shaft 11; a second support rod 23, one end of which has a second elongated groove 231, through which a second post 232 passes and is fixed to the housing, and the other end of which is pivotally mounted to the pivot rod 21 via a second pivot post 233, the second pivot post 233 abutting against another portion of the main shaft 11; a first main spring 24, disposed between the first post 222 and the first pivot post 223; and a second main spring 25, disposed between the second post 232 and the second pivot post 233. The first main spring 24 and the second main spring 25 are configured to provide a biasing force via the first pivot post in a first state to pivot the main shaft in a first direction, and via the second pivot post in a second state to pivot the main shaft in a second direction opposite to the first direction.
[0069] The drive mechanism 1 further includes: a first bracket (not shown) fixedly mounted to the spindle and carrying a first moving contact; a second bracket 12 rotatably disposed within the housing of the dual power transfer switch and carrying a second moving contact; and a locking assembly 13 connected between the spindle 11 and the second bracket 12, configured to switch between a locked state and an unlocked state. In the locked state, the locking assembly locks the second bracket 12 to keep the second moving contact in the closed position. In the unlocked state, the locking assembly allows the second bracket to move the second moving contact to the open position.
[0070] The drive mechanism also includes a locking member 14, which is rotatably disposed within the housing of the dual power changeover switch and configured to rotate between a locked position and an unlocked position. In the locked position, the locking member 14 abuts against the spindle 11 to prevent the spindle 11 from rotating, and in the unlocked position, the locking member 14 disengages from the spindle and allows the spindle to rotate.
[0071] The drive mechanism also includes a first actuator 15, configured to switch the locking component from a locked state to an unlocked state. Figures 1 to 12 In one embodiment, the locking component 13 and the second bracket 12 form a four-bar linkage.
[0072] The locking assembly 13 includes a first lever 131, one end of which is connected to a first actuator 15 and pivotally mounted within a housing; a second lever 132, one end of which is pivotally connected to a spindle, and the other end of which has an opening slot 133 in which a first pin of the first lever 131 is received; and a third lever 134, one end of which is pivotally connected to the other end of the first lever, and the other end of the third lever is connected to a second bracket, the other end of which has a groove in which a second pin of the second bracket is received. In the locked state, the first and third levers are in a first posture, such as... Figure 1 As shown, it is configured to provide a locking force to lock the second bracket against the biasing force of the tension spring. In the unlocked state, the first and third levers are in the second posture, as shown. Figure 3 As shown, it is configured not to provide locking force, so that the tension spring can pull the second moving contact toward the disconnected position.
[0073] The drive mechanism includes a second actuator 16 configured to actuate the locking member 14 to rotate between a locked position and an unlocked position.
[0074] The first and second actuators are in the form of electromagnetic actuators, which are well known to those skilled in the art, and therefore will not be described in detail here.
[0075] The drive mechanism also includes a tension spring 17 configured to provide a biasing force that moves the second moving contact toward the open position by the second support 12. That is, in the closed position of the second moving contact, the tension spring 17 is stretched and stores energy, thereby providing a biasing force to pull the second moving contact toward the open position.
[0076] The following describes the operation of the dual power transfer switch during the switchover from the first power supply mode to the second power supply mode.
[0077] like Figure 1 and 2 As shown, the dual power supply transfer switch is in the first power supply working mode. At this time, the first moving contact is in the first position, the second moving contact is in the closed position, the power electronic switch is in the off state, so that the first power supply S1 supplies power to the load.
[0078] When switching to the second power supply operating mode is required, firstly, the power electronic switch K3 switches from the off state to the on state, causing current to flow through the power electronic switch but not through the second switch K2. Next, the first actuator 15 pulls the first lever 131, causing the first lever 131 and the third lever 134 to switch from the first posture to the second posture. As a result, the tension spring 17 pulls the second bracket 12, thereby moving the second bracket 12, along with the second moving contact, to the off position. Figure 3 and 4 As shown.
[0079] Then, the power electronic switch K3 switches from the ON state to the OFF state. At this time, the detection device electrically connected to the main circuit of the dual power transfer switch detects whether there is current in the main circuit of the dual power transfer switch. When there is current in the main circuit, the fuse F blows. This fuse F is connected in series with the power electronic switch K3 and then in parallel with the second switch K2. When the detection device does not detect current in the main circuit, the second actuator 16 pulls the locking member 14, causing the locking member 14 to move from the locked position to the unlocked position, so that the locking member disengages from the contact with the main shaft (e.g., Figure 5 As shown). As a result, the spindle 11 moves along the first direction under the action of the main spring assembly 2 (as shown). Figure 6 Rotating clockwise (as is) causes the first bracket to move the first moving contact away from the first position, as... Figure 6 and 7 As shown, at this time, the first moving contact of the first switch K1 leaves the first position.
[0080] Next, as the spindle rotates along the first direction, the spindle drives the second rod 132 to move, causing the opening slot 133 of the second rod 132 to abut against the first pin of the first rod 131, thereby switching the first rod 131 and the third rod 134 from the second posture to the first posture, as shown. Figure 8As shown, this causes the first lever 131 and the third lever 134 to move the second bracket, which in turn moves the second moving contact to the closed position, as shown. Figure 9 As shown. At this point, the first and third levers again provide the locking force to lock the second moving contact on the second bracket in the closed position.
[0081] Then, the spindle continues to rotate in the first direction, thereby causing the first moving contact on the first support to finally move to the second position, such as... Figure 10 and 11 As shown, the second power supply is turned on. Then, the main spring assembly 2 switches to the second posture, as... Figure 12 As shown, it can be used to switch from the second power supply operating mode to the first power supply operating mode.
[0082] The process of switching from the second power supply mode to the first power supply mode by the dual power supply transfer switch is similar to the process described above, so it will not be repeated here.
[0083] Figure 13 A schematic diagram of a dual power supply switch according to another embodiment of this application is shown, in which the dual power supply switch is in the first power supply operating mode. The difference between this embodiment and the previous embodiment lies in the specific form of the locking component. In the previous embodiment, the locking component and the second bracket form a four-bar linkage structure. Figure 13 In one embodiment, the locking component is a hook-shaped structure.
[0084] Specifically, Figure 13 The locking assembly 2' of the embodiment includes: a hook 21' connected to a first actuator and configured to pivot between a hooked position and a released position when actuated by the first actuator; in the hooked position, the hook is hooked onto a second bracket to prevent the second bracket from moving toward a disconnected position under the action of a tension spring; in the released position, the hook is disengaged from the hook of the second bracket; and a connecting rod 22' connected between the first bracket and the spindle, the connecting rod having a third elongated groove into which a third pin of the first bracket is inserted.
[0085] The connecting rod 22' in this embodiment functions similarly to the second rod in the aforementioned embodiment; therefore, Figure 13 The working process of the illustrated embodiments will not be described in detail herein, but those skilled in the art can conceive of it based on the working process of the foregoing embodiments. Figure 13 The working process of the embodiment.
[0086] The dual power supply transfer switch of this application enables the use of a smaller number of IGBTs (only one) while achieving a fast switching speed, such as within 10ms. Furthermore, complete isolation is achieved between the first and second power supplies.
[0087] Although the present invention has been described in the specification and illustrated in the accompanying drawings with reference to various embodiments, those skilled in the art will understand that the above embodiments are merely preferred embodiments, and some technical features in the embodiments may not be necessary for solving specific technical problems, so these technical features may be omitted or omitted without affecting the solution of the technical problem or the formation of the technical solution; moreover, the features, elements and / or functions of one embodiment may be appropriately combined, combined or coordinated with the features, elements and / or functions of one or more other embodiments, unless such combination, combination or coordination is obviously not feasible.
Claims
1. A dual-power transfer switch configured to switch between a first power supply and a second power supply, characterized in that, The dual power supply transfer switch includes: A first switch has a first movable contact configured to rotate between a first position and a second position. In the first position, the first movable contact is connected to a first stationary contact for a first power supply, and in the second position, the first movable contact is connected to a second stationary contact for a second power supply. The second switch and the power electronic switch are connected in parallel and then connected in series with the first switch. The second switch has a second moving contact, which is configured to switch between a closed position and an open position. The power electronic switch is configured to switch between an on state and an off state. The drive mechanism is configured to drive the first moving contact to switch between a first position and a second position, and to drive the second moving contact to switch between a closed position and an open position. In the first power supply operating mode of the dual power supply transfer switch, the first moving contact is in the first position, the second moving contact is in the closed position, and the power electronic switch is in the off state. In the second power supply operating mode of the dual power supply transfer switch, the first moving contact is in the second position, the second moving contact is in the closed position, and the power electronic switch is in the off state. During the switching of the dual power supply transfer switch from the first power supply operating mode to the second power supply operating mode, the power electronic switch first switches to the ON state, then the drive mechanism drives the second moving contact to switch from the closed position to the OFF position, then the power electronic switch switches to the OFF state, the drive mechanism drives the first moving contact to switch from the first position to the second position, and drives the second moving contact to switch from the OFF position back to the OFF position.
2. The dual power supply transfer switch as described in claim 1, characterized in that, The drive mechanism includes: The spindle is rotatably disposed within the housing of the dual power transfer switch and configured to rotate under the action of the main spring drive assembly, which is switchable between a first state and a second state. In the first state, the main spring drive assembly is configured to provide a biasing force that pivots the spindle in a first direction, and in the second state, the main spring drive assembly is configured to provide a biasing force that pivots the spindle in a second direction opposite to the first direction. The first bracket is fixedly installed on the spindle and supports the first moving contact. The second bracket is rotatably mounted inside the housing of the dual power transfer switch and carries the second moving contact; A locking assembly, connected between the spindle and the second support, is configured to switch between a locked state and an unlocked state. In the locked state, the locking assembly locks the second support to keep the second moving contact in the closed position. In the unlocked state, the locking assembly allows the second support to move the second moving contact to the open position.
3. The dual power supply transfer switch as described in claim 2, characterized in that, The drive mechanism also includes a locking element rotatably disposed within the housing of the dual power transfer switch, configured to rotate between a locked position and an unlocked position. In the locked position, the locking element abuts against the spindle to prevent the spindle from rotating, and in the unlocked position, the locking element disengages from the spindle and allows the spindle to rotate.
4. The dual power supply transfer switch as described in claim 3, characterized in that, The drive mechanism includes a first actuator configured to switch the locking component from a locked state to an unlocked state, the locking component and the second bracket forming a four-bar linkage.
5. The dual power supply transfer switch as described in claim 4, characterized in that, The drive mechanism includes a second actuator configured to actuate the locking member to rotate between a locked position and an unlocked position.
6. The dual power supply transfer switch as described in claim 5, characterized in that, The drive mechanism also includes a tension spring configured to provide a biasing force that moves the second support toward the disconnected position.
7. The dual power supply transfer switch as described in claim 6, characterized in that, The locking component includes: The first rod, one end of which is connected to the first actuator, is pivotally mounted in the housing at the first pivot point; The second rod has one end pivotally connected to the main shaft and the other end is provided with an opening slot, in which the first pin of the first rod is accommodated; The third rod has one end pivotally connected to the other end of the first rod, and the other end of the third rod is connected to the second bracket. A groove is provided on the other end of the third rod, and the second pin of the second bracket is accommodated in the groove. In the locked state, the first and third levers are in the first position and configured to provide a locking force that counteracts the biasing force of the tension spring to lock the second bracket. In the unlocked state, the first and third levers are in the second position and configured not to provide locking force.
8. The dual power supply transfer switch as described in claim 7, characterized in that, When the first actuator pulls the first rod to pivot, the first rod drives the third rod to pivot, causing the first and third rods to switch from the first posture to the second posture, thereby eliminating the locking force. Then, under the biasing force of the tension spring, the second bracket drives the second moving contact to rotate toward the disconnected position.
9. The dual power supply transfer switch as described in claim 8, characterized in that, During the switching of the dual power supply transfer switch from the first power supply operating mode to the second power supply operating mode, after the power electronic switch switches to the on state, the first actuator switches the locking component from the locked state to the unlocked state, causing the first and third levers to switch from the first posture to the second posture, thereby allowing the second bracket to move the second moving contact to the off position. Then, the second actuator switches the locking element from the locked position to the unlocked position, and the main shaft rotates along the first direction under the action of the main spring drive component, thereby driving the first bracket and then the first moving contact to rotate from the first position to the second position, and at the same time driving the second lever to rotate, so that the second lever abuts against the first pin through the opening slot, causing the first and third levers to switch towards the first posture, pushing the second bracket to drive the second moving contact to rotate to the closed position, so that the second switch is closed. Then, the continued rotation of the main shaft drives the first bracket to rotate to the second position and simultaneously drives the second lever to pivot. At this time, the first pin of the first lever moves relative to the opening slot of the second lever. Then, the main spring drive component switches to the second state.
10. The dual power supply transfer switch as described in any one of claims 1 to 9, characterized in that, The dual power transfer switch also includes a fuse, which is connected in series with the power electronic switch and then in parallel with the second switch.
11. The dual power supply transfer switch as described in claim 10, characterized in that, It also includes a detection device electrically connected to the main circuit of the dual-power transfer switch, configured to detect the presence of current in the main circuit of the dual-power transfer switch after the power electronic switch switches from the on state to the off state. When the detection device does not detect current in the main circuit, the drive mechanism starts to drive the first moving contact to switch from the first position to the second position, and drives the second moving contact to switch from the open position back to the closed position.
12. The dual power supply transfer switch as described in any one of claims 1 to 10, characterized in that, The power electronic switch is an IGBT.
13. The dual power supply transfer switch as described in claim 5, characterized in that, The first actuator and the second actuator are electromagnetic actuators.
14. The dual power supply transfer switch as described in any one of claims 2 to 10, characterized in that, The main spring drive assembly includes: A pivot rod, pivotally mounted on the housing; The first bearing rod has a first long groove at one end, a first column passes through the first long groove and is fixed to the housing, and the other end is pivotally mounted to the pivot rod via a first pivot column, the first pivot column abutting a portion of the main shaft; The second bearing rod has a second long groove at one end, through which a second column passes and is fixed to the housing, and at the other end is pivotally mounted to the pivot rod via a second pivot column, which abuts against another part of the main shaft; The first main spring is located between the first column and the first pivot column; The second main spring is located between the second column and the second pivot column. The first main spring and the second main spring are configured to provide a biasing force via the first pivot post in a first state to pivot the main shaft in a first direction, and via the second pivot post in a second state to pivot the main shaft in a second direction opposite to the first direction.
15. The dual power supply transfer switch as described in claim 6, characterized in that, The locking component includes: A hook-like element, connected to a first actuator, is configured to pivot between a hooked position and a released position when actuated by the first actuator. In the hooked position, the hook-like element hooks onto a second support to prevent the second support from moving toward a disconnected position under the action of a tension spring. In the released position, the hook-like element disengages from the hook on the second support. A connecting rod, which connects the first bracket and the main shaft, has a third long slot into which the third pin of the first bracket is inserted.