Motor control circuit, dual power transfer switch and emergency power supply system

Abstract

The application relates to the field of electronic technology, in particular to a motor control circuit, a double-power conversion switch and an emergency power supply system. The motor control circuit comprises a first electromagnetic relay and a second electromagnetic relay. The first electromagnetic relay comprises a first electromagnetic coil, a first group of normally open contacts and a first group of normally closed contacts. The second electromagnetic relay comprises a second electromagnetic coil, a second group of normally open contacts and a second group of normally closed contacts. The first group of normally open contacts and the second group of normally closed contacts are connected in series, and a motor power supply device is electrically connected to a first input end of a motor through the first group of normally open contacts and the second group of normally closed contacts. The first group of normally closed contacts and the second group of normally open contacts are connected in series, and the motor power supply device is electrically connected to a second input end of the motor through the first group of normally closed contacts and the second group of normally open contacts. When the first electromagnetic coil and the second electromagnetic coil are powered at the same time, the motor power supply device cannot supply power to the motor, so that the motor can avoid receiving opposite rotating signals, and the circuit short circuit or the motor damage can be prevented.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a motor control circuit, a dual power transfer switch, and an emergency power supply system. Background Technology

[0002] Emergency power supply systems require dual power transfer switches. These switches support both primary and backup power supplies to the load. To ensure the load operates normally, the dual power transfer switch must guarantee that the load is not simultaneously connected to either the primary or backup power supply.

[0003] In related technologies, a dual-power transfer switch includes a motor and a switching device. The operation of the switching device is controlled by the forward and reverse rotation of the motor. For example, when the motor rotates forward, the switching device connects the load to the main power supply, and the main power supply supplies power to the load. When the motor rotates in reverse, the switching device disconnects the main power supply and connects the backup power supply to the load, and the backup power supply supplies power to the load.

[0004] In some special environments, the motor in a dual power transfer switch may receive both forward and reverse signals simultaneously. In severe cases, this could burn out the circuit and damage the motor. Utility Model Content

[0005] This invention provides a motor control circuit, a dual power supply transfer switch, and an emergency power supply system, which can prevent the motor from receiving both forward and reverse signals simultaneously, thereby improving the reliability of motor operation.

[0006] The technical solution of this utility model is as follows:

[0007] In one aspect, this application provides a motor control circuit, including a first electromagnetic relay and a second electromagnetic relay.

[0008] The first electromagnetic relay includes a first electromagnetic coil, a first set of normally open contacts, and a first set of normally closed contacts. The second electromagnetic relay includes a second electromagnetic coil, a second set of normally open contacts, and a second set of normally closed contacts.

[0009] The first set of normally open contacts and the second set of normally closed contacts are connected in series. The motor power supply device is electrically connected to the first input terminal of the motor through the first set of normally open contacts and the second set of normally closed contacts.

[0010] The first set of normally closed contacts is connected in series with the second set of normally open contacts. The motor power supply device is electrically connected to the second input terminal of the motor through the first set of normally closed contacts and the second set of normally open contacts.

[0011] When the first input terminal is energized, the motor rotates in the first direction. When the second input terminal is energized, the motor rotates in the second direction. One of the first and second directions is clockwise, and the other is counterclockwise.

[0012] Based on the motor control circuit provided in the first aspect, the first set of normally open contacts and the second set of normally closed contacts are connected in series in the motor control circuit, and the first set of normally closed contacts and the second set of normally open contacts are connected in series. In this way, when the first electromagnetic relay coil and the second electromagnetic relay coil are energized at the same time, the motor power supply device will not supply power to the motor, thereby avoiding the motor from receiving two opposite rotation signals at the same time, and preventing the circuit from short-circuiting and burning out or the motor from being damaged.

[0013] Furthermore, the motor control circuit provided in this application achieves interlocking between the first electromagnetic relay and the second electromagnetic relay without adding any additional components, which has the effect of saving costs.

[0014] In one possible design, the motor power supply unit serves as both the main power source and a backup power source.

[0015] The motor control circuit also includes a first switching unit, which is used to control the on / off of the power supply channel between the main power supply and the motor, and the on / off of the power supply channel between the backup power supply and the motor, based on the status of the main power supply and the backup power supply.

[0016] Based on the motor control circuit provided in this embodiment, the motor control circuit includes a first switching unit. The main power supply and backup power supply for powering the load can supply power to the motor through the first switching unit. Thus, there is no need to set up an additional power supply device for the motor, which can save costs. In addition, supplying power to the motor through dual power supplies of main power supply and backup power supply can also improve the reliability of motor power supply.

[0017] In one possible design, the first switching unit includes a third electromagnetic relay, which includes at least a third electromagnetic coil, a third set of normally closed contacts, a fourth set of normally closed contacts, a third set of normally open contacts, and a fourth set of normally open contacts.

[0018] One end of the third set of normally closed contacts is electrically connected to the live wire of the main power supply, and the other end of the third set of normally closed contacts is electrically connected to the first input terminal of the motor through the first set of normally open contacts and the second set of normally closed contacts.

[0019] One end of the fourth set of normally closed contacts is electrically connected to the neutral wire of the main power supply, and the other end of the fourth set of normally closed contacts is electrically connected to the neutral signal input terminal of the motor.

[0020] One end of the third set of normally open contacts is electrically connected to the live wire of the backup power supply, and the other end of the third set of normally open contacts is electrically connected to the second input terminal of the motor through the first set of normally closed contacts and the second set of normally open contacts.

[0021] One end of the fourth set of normally open contacts is electrically connected to the neutral wire of the backup power supply, and the other end of the fourth set of normally open contacts is electrically connected to the neutral signal input terminal of the motor.

[0022] In one possible design, the motor control circuit also includes a coil power supply unit, which includes a first power supply processing unit, a second power supply processing unit, and a second switching unit.

[0023] The first power supply processing unit is electrically connected to the main power supply and is used to process the output voltage of the main power supply and supply power to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil.

[0024] The second power supply processing unit is electrically connected to the backup power supply and is used to process the output voltage of the backup power supply and supply power to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil.

[0025] The second switching unit controls the connection and disconnection of the power supply channels between the main power supply and the backup power supply and the first, second, and third electromagnetic coils based on the status of the main power supply and the backup power supply.

[0026] Based on the motor control circuit provided by this embodiment, the main power supply and the backup power supply can supply power to the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil through the coil power supply unit. In this way, there is no need to set up an additional power supply for the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil, which is beneficial to cost saving.

[0027] In addition, the main power supply and backup power supply can respectively provide appropriate voltages to the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil through the first power supply processing unit and the second power supply processing unit, so that the first electromagnetic coil and the second electromagnetic coil can work under appropriate voltage. In this way, it can avoid the occurrence of phenomena such as the coil working voltage being too low, the contacts not working properly, or the coil being too high, causing the coil to burn out.

[0028] In one possible design, the first power supply processing unit includes a first step-down module and a first AC-DC conversion module. The input terminal of the first step-down module is electrically connected to the output terminal of the main power supply to reduce the output voltage of the main power supply.

[0029] The input terminal of the first AC-DC converter module is electrically connected to the output terminal of the first step-down module, and is used to convert the AC power output by the first step-down module into DC power.

[0030] The second power supply processing unit includes a second step-down module and a second AC-DC conversion module; the input terminal of the second step-down module is electrically connected to the output terminal of the backup power supply to reduce the output voltage of the backup power supply.

[0031] The input terminal of the second AC-DC converter module is electrically connected to the output terminal of the second step-down module, and is used to convert the AC power output by the second step-down module into DC power.

[0032] The coil power supply unit also includes a voltage regulator module. The input terminal of the voltage regulator module is connected to the output terminals of the first AC-DC conversion module and the second AC-DC conversion module, and is used to regulate the DC power output by the first AC-DC conversion module and the second AC-DC conversion module.

[0033] The output terminal of the voltage regulator module is electrically connected to the two ends of the first electromagnetic coil, the two ends of the second electromagnetic coil, and the two ends of the third electromagnetic coil, and is used to supply power to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil.

[0034] Based on the motor control circuit provided by this embodiment, the output voltages of the main power supply and the backup power supply are processed sequentially by the step-down module, the AC-DC conversion module and the voltage regulation module, which can stably provide appropriate operating voltages for the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil, which is beneficial to the reliable operation of the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil.

[0035] In one possible design, the second switching unit includes a first electronic switch, a second electronic switch, and a third electronic switch. The first electronic switch is connected in series with the first electromagnetic coil. The second electronic switch is connected in series with the second electromagnetic coil. The third electronic switch is connected in series with the third electromagnetic coil. Thus, by controlling the on / off states of the first, second, and third electronic switches, the energization and de-energization of the first, second, and third electromagnetic coils can be controlled.

[0036] In one possible design, the motor control circuit also includes a controller that is electrically connected to both the main power supply and the backup power supply, and is capable of monitoring the voltages of both the main power supply and the backup power supply.

[0037] The controller is also electrically connected to the second switching unit to turn on or off the power supply to the first, second, and third electromagnetic coils based on voltage monitoring results of the main power supply and the backup power supply.

[0038] Based on the motor control circuit provided in this embodiment, the controller can monitor the status of the main power supply and the backup power supply, and control the second switching unit according to the monitoring results. This enables automatic control of the motor control circuit, saving manpower. Furthermore, the same controller can monitor voltage, switch the power supply to the first electromagnetic coil, and switch the power supply to the second and third electromagnetic coils, which helps simplify the structure of the motor control circuit.

[0039] In one possible design, the motor control circuit also includes a third power supply processing unit.

[0040] The input terminal of the third power supply processing unit is electrically connected to the output terminal of the voltage regulator module, and is used to convert the output voltage of the voltage regulator module into the working voltage of the controller. The output terminal of the third power supply processing unit is electrically connected to the power supply terminal of the controller.

[0041] Based on the motor control circuit provided in this embodiment, the output voltage of the voltage regulator module is varied by the third power supply processing unit to suit the power supply of the controller. Thus, the controller can draw power from the main power supply and the backup power supply without the need for additional power supply equipment.

[0042] Secondly, based on the same inventive concept, this application also provides a dual-power transfer switch, including a motor, a motor control circuit, and a switching device. The motor control circuit is the motor control circuit described above.

[0043] The motor control circuit is electrically connected to the motor and is used to control the motor's rotation state, which includes rotation in a first direction and rotation in a second direction. The switching device is electrically connected to the motor and driven by the motor. When the motor rotates in the first direction, it connects the main power supply to the load. When the motor rotates in the second direction, it connects the backup power supply to the load.

[0044] Based on the dual power supply transfer switch provided in the second aspect, including any of the motor control circuits mentioned above, the beneficial effects can be found in the beneficial effects brought about by the motor control circuits mentioned above, and will not be described in detail here.

[0045] Thirdly, based on the same inventive concept, this application also provides an emergency power supply system, including a main power supply, a backup power supply, and a dual power supply transfer switch. The dual power supply transfer switch is the aforementioned dual power supply transfer switch, and the main power supply and the backup power supply are electrically connected to the load through the dual power supply transfer switch. Attached Figure Description

[0046] Figure 1 This is a structural diagram of an emergency power supply system.

[0047] Figure 2 This is a schematic diagram of the connection between the motor control circuit and the motor provided in an embodiment of this application.

[0048] Figure 3 The diagram shows one type of contact for the first and second electromagnetic relays in this application.

[0049] Figure 4 The diagram shows another contact type for the first and second electromagnetic relays in this application.

[0050] Figure 5 The diagram shows another contact type for the first and second electromagnetic relays in this application.

[0051] Figure 6 This is a schematic diagram illustrating the connection between a motor control circuit and a motor, a main power supply, and a backup power supply, as provided in an embodiment of this application.

[0052] Figure 7 This is a schematic diagram illustrating the connection between a motor control circuit and a motor, a main power supply, and a backup power supply, as provided in an embodiment of this application.

[0053] Figure 8 This is a schematic diagram illustrating the connection between a motor control circuit and a motor, a main power supply, and a backup power supply, as provided in an embodiment of this application.

[0054] Figure 9 This is a schematic diagram illustrating the connection between a motor control circuit and a motor, a main power supply, and a backup power supply, as provided in an embodiment of this application.

[0055] Figure 10 This is a schematic diagram illustrating the connection between a motor control circuit and a motor, a main power supply, and a backup power supply, as provided in an embodiment of this application.

[0056] The attached figures are labeled as follows:

[0057] 1. Dual power transfer switch; 2. Main power supply; 3. Backup power supply; 4. Load;

[0058] 11. Motor control circuit; 12. Motor; 13. Switching device;

[0059] 111. Motor power supply device; 112. Coil power supply unit; 1121. First power supply processing unit; 1122. Second power supply processing unit; 1123. Second switching unit; 1124. Voltage regulator module; 113. First switching unit;

[0060] K1, First electromagnetic relay; K2, Second electromagnetic relay; K3, Third electromagnetic relay; L1, First electromagnetic coil; L2, Second electromagnetic coil; L3, Third electromagnetic coil; S2, First group of normally open contacts; S1, First group of normally closed contacts; S3, Second group of normally closed contacts; S4, Second group of normally open contacts; S5, Third group of normally closed contacts; S6, Third group of normally open contacts; 114, Controller; 115, Third power supply processing unit. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0063] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0065] In the description of this application, unless otherwise stated, "multiple" means two or more (including two).

[0066] In the description of this application, the term "connected" or "connected" in circuit structure can refer not only to physical connection, but also to electrical or signal connection. For example, it can be a direct connection (physical connection), or an indirect connection through at least one intermediate component, as long as the circuit is connected. It can also refer to the internal connection between two components. Signal connection can refer to signal connection through a circuit or through a media, such as radio waves. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] The present application will be described in detail below with reference to the accompanying drawings.

[0068] Figure 1 Please refer to the structural diagram of the emergency power supply system. Figure 1 The emergency power supply system includes a main power supply 2, a backup power supply 3, and a dual power transfer switch 1.

[0069] The dual power transfer switch 1 includes a motor control circuit 11, a motor 12, and a switching device 13. The motor control circuit 11 is electrically connected to the motor 12 and can control the rotation direction of the motor 12. The switching device 13 is connected to the motor 12 and selects either the main power supply 2 or the backup power supply 3 to supply power to the load 4 according to the different rotation directions of the motor 12.

[0070] For example, when the main power supply 2 is in a normal state, the motor control circuit 11 controls the motor 12 to rotate forward, and the motor 12 drives the switching device 13 to activate, connecting the main power supply 2 with the load 4. When the main power supply 2 malfunctions, the motor control circuit 11 controls the motor 12 to rotate in reverse, and the motor 12 drives the switching device 13 to activate, disconnecting the circuit connection between the main power supply 2 and the load 4, and connecting the circuit between the backup power supply 3 and the load 4.

[0071] In existing technology, motor control circuits include two electromagnetic relays, and the forward and reverse rotation of the motor is achieved by controlling the opening and closing of the two electromagnetic relays. For example, the motor rotates forward when one electromagnetic relay is closed, and the motor rotates in reverse when the other electromagnetic relay is closed.

[0072] To prevent two electromagnetic relays from closing simultaneously, a circuit module needs to be installed between the two electromagnetic relays in the motor control circuit to ensure reliable and stable motor operation. This type of motor control circuit is relatively expensive.

[0073] In view of this, this application provides a motor control circuit 11. Figure 2 This is a schematic diagram of the structure of the motor control circuit 11 provided in the embodiment of this application.

[0074] Please refer to Figure 2 The motor control circuit 11 provided in this application includes a first electromagnetic relay K1 and a second electromagnetic relay K2.

[0075] The first electromagnetic relay K1 includes a first electromagnetic coil L1, a first set of normally open contacts S2, and a first set of normally closed contacts S1. The second electromagnetic relay K2 includes a second electromagnetic coil L2, a second set of normally open contacts S4, and a second set of normally closed contacts S3.

[0076] The first set of normally open contacts S2 and the second set of normally closed contacts S3 are connected in series. The motor power supply device 111 is electrically connected to the first input terminal of the motor 12 through the first set of normally open contacts S2 and the second set of normally closed contacts S3.

[0077] The first set of normally closed contacts S1 and the second set of normally open contacts S4 are connected in series. The motor power supply device 111 is electrically connected to the second input terminal of the motor 12 through the first set of normally closed contacts S1 and the second set of normally open contacts S4.

[0078] When the first input terminal is energized, the motor 12 rotates in the first direction. When the second input terminal is energized, the motor 12 rotates in the second direction, one of which is clockwise and the other is counterclockwise.

[0079] It should be noted that the normally open and normally closed contacts in an electromagnetic relay are complementary contact types, and their state is determined by whether the electromagnetic coil is energized. When the electromagnetic coil is not energized, the normally open contacts are open, and the normally closed contacts are closed. When the electromagnetic coil is energized, the normally open contacts are closed, and the normally closed contacts are open.

[0080] Based on this, when the motor 12 needs to rotate in the first direction, the first electromagnetic coil L1 is energized, the first set of normally open contacts S2 closes, and the first set of normally closed contacts S1 opens. The motor power supply device 111 can be electrically connected to the first input terminal of the motor 12 through the first set of normally open contacts S2 and the second set of normally closed contacts S3. The first input terminal of the motor 12 is energized, and the motor 12 rotates in the first direction.

[0081] If the second electromagnetic coil L2 is also energized during the rotation of motor 12 in the first direction, the second set of normally open contacts S4 will be attracted and the second set of normally closed contacts S3 will be opened. The motor power supply device 111 will be unable to supply power to motor 12, and motor 12 will stop rotating.

[0082] Similarly, when the motor 12 needs to rotate in the second direction, the second electromagnetic coil L2 is energized, the second set of normally open contacts S4 is closed, and the second set of normally closed contacts S3 is opened. The motor power supply device 111 can be electrically connected to the second input terminal of the motor 12 through the first set of normally closed contacts S1 and the second set of normally open contacts S4. The second input terminal of the motor 12 is energized, and the motor 12 rotates in the second direction.

[0083] If the first electromagnetic coil L1 is also energized during the rotation of motor 12 in the second direction, the first set of normally open contacts S2 will be attracted and the first set of normally closed contacts S1 will be opened. The motor power supply device 111 will be unable to supply power to motor 12, and motor 12 will stop rotating.

[0084] As can be seen from the above, in the motor control circuit 11, the first set of normally open contacts S2 and the second set of normally closed contacts S3 are connected in series, and the first set of normally closed contacts S1 and the second set of normally open contacts S4 are connected in series. In this way, when the first electromagnetic coil L1 and the second electromagnetic coil L2 are energized at the same time, the motor power supply device 111 will not supply power to the motor 12, thereby avoiding the motor 12 from receiving the opposite rotation signal and preventing short circuit or damage to the motor 12.

[0085] In addition, by Figure 2 As can be seen from the motor control circuit 11 shown, the motor control circuit 11 of this application achieves interlocking between the first electromagnetic relay K1 and the second electromagnetic relay K2 without adding any additional components, which has the effect of saving costs.

[0086] Figure 3The image shows one contact type of the first electromagnetic relay K1 and the second electromagnetic relay K2 in this application. Please refer to... Figure 2 and Figure 3 Both the first electromagnetic relay K1 and the second electromagnetic relay K2 can be relays with one set of normally open contacts and one set of normally closed contacts. For example... Figure 3 As shown, contact 2 and contact 5 form a set of normally closed contacts, and contact 3 and contact 6 form a set of normally open contacts.

[0087] when Figure 3 When the relays shown are used as the first electromagnetic relay K1 and the second electromagnetic relay K2, the normally open and normally closed contacts can be referenced. Figure 2 The embodiment connects to the motor control circuit 11 in the manner described.

[0088] Figure 4 The diagram shows another contact type for the first electromagnetic relay K1 and the second electromagnetic relay K2 in this application. Please refer to... Figure 2 and Figure 4 Both the first electromagnetic relay K1 and the second electromagnetic relay K2 can be relays with two sets of normally open contacts and two sets of normally closed contacts. For example... Figure 4 As shown, contacts 8 and 7 form a set of normally open contacts, contacts 9 and 6 form a set of normally closed contacts, contacts 10 and 5 form another set of normally open contacts, and contacts 11 and 4 form another set of normally closed contacts.

[0089] when Figure 4 When the relay shown is used as the first electromagnetic relay K1 or the second electromagnetic relay K2, either of the two sets of normally open contacts or either of the two sets of normally closed contacts can be connected to the motor control circuit 11.

[0090] Figure 5 The diagram shows another contact type for the first electromagnetic relay K1 and the second electromagnetic relay K2 in this application. Please refer to... Figure 2 and Figure 5 Both the first electromagnetic relay K1 and the second electromagnetic relay K2 can be relays with two or more sets of normally open contacts and two or more sets of normally closed contacts. For example... Figure 5 As shown, contact 1 and contact 2 form a normally open contact, and contact 3 and contact 4 form a normally closed contact. The relay includes four sets of normally open contacts and one set of normally closed contacts.

[0091] when Figure 5 When the relay shown is used as the first electromagnetic relay K1 or the second electromagnetic relay K2, this set of normally closed contacts and any one of the four sets of normally open contacts can be connected to the motor control circuit 11.

[0092] As can be seen from the above, there are many possible types of the first electromagnetic relay K1 and the second electromagnetic relay K2 in this application. Electromagnetic relays with at least one set of normally open contacts and at least one set of normally closed contacts can be used in this application. In addition, the number of contact sets of the first electromagnetic relay K1 and the second electromagnetic relay K2 can be the same or different.

[0093] Figure 6 This is a schematic diagram illustrating the connection between a motor control circuit 11, a motor 12, a main power supply 2, and a backup power supply 3, as provided in an embodiment of this application. Please refer to... Figure 6 In some embodiments of this application, the motor power supply device is the main power supply 2 and the backup power supply 3.

[0094] The motor control circuit 11 also includes a first switching unit 113, which controls the on / off of the power supply channel between the main power supply 2 and the motor 12 based on the status of the main power supply 2 and the backup power supply 3, and controls the on / off of the power supply channel between the backup power supply 3 and the motor 12.

[0095] Specifically, when the main power supply 2 is in normal working condition, the first switching unit 113 connects the power supply channel between the main power supply 2 and the motor 12. When the main power supply 2 is abnormal, the first switching unit 113 connects the power supply channel between the backup power supply 3 and the motor 12.

[0096] Thus, in this embodiment, the main power supply 2 and the backup power supply 3 can supply power to the motor 12 through the first switching unit 113, thereby eliminating the need for an additional power supply device for the motor 12 and saving costs. Furthermore, supplying power to the motor 12 with a dual power supply including the main power supply 2 and the backup power supply 3 also improves the reliability of the power supply to the motor 12.

[0097] Figure 7 This is a schematic diagram illustrating the connection between a motor control circuit 11 and a motor 12, a main power supply 2, and a backup power supply 3, as provided in an embodiment of this application. In some embodiments of this application, the first switching unit 113 includes a third electromagnetic relay K3, which includes at least a third set of normally closed contacts S5, a fourth set of normally closed contacts (not shown in the figure), a third set of normally open contacts S6, and a fourth set of normally open contacts (not shown in the figure). One end of the third set of normally closed contacts S5 is electrically connected to the live wire of the main power supply 2, and the other end of the third set of normally closed contacts S5 is electrically connected to the first input terminal of the motor 12 through a first set of normally open contacts S2 and a second set of normally closed contacts S3. One end of the fourth set of normally closed contacts is electrically connected to the neutral wire of the main power supply 2, and the other end of the fourth set of normally closed contacts is electrically connected to the neutral signal input terminal of the motor 12.

[0098] One end of the third set of normally open contacts S6 is electrically connected to the live wire of the backup power supply 3, and the other end of the third set of normally open contacts S6 is electrically connected to the second input terminal of the motor 12 through the first set of normally closed contacts S1 and the second set of normally open contacts S4. One end of the fourth set of normally open contacts is electrically connected to the neutral wire of the backup power supply 3, and the other end of the fourth set of normally open contacts is electrically connected to the neutral signal input terminal of the motor 12.

[0099] Specifically, in some cases, both the main power supply 2 and the backup power supply 3 are 380V three-phase AC power supplies, while the motor 12 uses single-phase 220V AC power. The first switching unit 113 adopts a third electromagnetic relay K3 with two sets of normally open contacts and two sets of normally closed contacts. The two sets of normally closed contacts of the third electromagnetic relay K3 are respectively connected to the live wire and neutral wire of the main power supply 2, and the two sets of normally open contacts of the third electromagnetic relay K3 are respectively connected to the live wire and neutral wire of the backup power supply 3.

[0100] When the main power supply 2 is in normal condition, the third electromagnetic coil L3 is not energized, and the third set of normally closed contacts S5 and the fourth set of normally closed contacts are in the closed state. The first set of normally open contacts S2 and the second set of normally closed contacts S3 are also in the closed state. The live wire signal of the main power supply 2 is transmitted to the motor 12 through the third set of normally closed contacts S5, the engaged first set of normally open contacts S2, and the engaged second set of normally closed contacts S3. The neutral wire signal of the main power supply 2 is transmitted to the motor 12 through the fourth set of normally closed contacts.

[0101] When the main power supply 2 is in an abnormal state and the backup power supply 3 is in a normal state, the third electromagnetic coil L3 is energized. The third set of normally closed contacts S5 and the fourth set of normally closed contacts are both open. The third set of normally open contacts S6, the fourth set of normally open contacts, the first set of normally closed contacts S1, and the second set of normally open contacts S4 are all closed. The live wire signal of the backup power supply 2 is transmitted to the motor 12 through the third set of normally open contacts S6, the first set of normally closed contacts S1, and the closed second set of normally open contacts S4. The neutral wire signal of the backup power supply 3 is transmitted to the motor 12 through the closed fourth set of normally open contacts.

[0102] It should be noted that the first switching unit 113 can be implemented using an electromagnetic relay, or other switching devices such as contactors, IGBT modules, etc.

[0103] It should also be noted that, as an equivalent alternative to this embodiment, in some other embodiments of this application, the two normally open contacts of the third electromagnetic relay K3 are respectively connected to the live and neutral wires of the main power supply 2, and the two normally closed contacts of the third electromagnetic relay K3 are respectively connected to the live and neutral wires of the backup power supply 3. Thus, when the main power supply 2 is normal, the third electromagnetic coil L3 of the third electromagnetic relay K3 is energized, the two normally open contacts of the third electromagnetic relay K3 are closed, and the main power supply 2 supplies power to the motor 12 through the two normally open contacts. When the main power supply 2 is abnormal and the backup power supply 3 is normal, the third electromagnetic coil L3 of the third electromagnetic relay K3 is de-energized, the two normally open contacts of the third electromagnetic relay K3 are open, and the two normally closed contacts are closed, and the backup power supply 3 supplies power to the motor 12 through the two normally closed contacts.

[0104] Figure 8 This is a schematic diagram illustrating the connection between a motor control circuit 11, a motor 12, a main power supply 2, and a backup power supply 3, as provided in an embodiment of this application. Please refer to... Figure 7 and Figure 8 In some embodiments of this application, the motor control circuit 11 includes a coil power supply unit 112, which includes a first power supply processing unit 1121, a second power supply processing unit 1122, and a second switching unit 1123.

[0105] The first power supply processing unit 1121 is electrically connected to the main power supply 2 and is used to process the output voltage of the main power supply 2 and supply power to the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3.

[0106] The second power supply processing unit 1122 is electrically connected to the backup power supply 3 and is used to process the output voltage of the backup power supply 3 and supply power to the first electromagnetic coil L1, the second electromagnetic coil L2 and the third electromagnetic coil L3.

[0107] The second switching unit 1123 controls the on / off switching of the power supply channels between the main power supply 2 and the backup power supply 3 and the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3 based on the status of the main power supply 2 and the backup power supply 3.

[0108] For details, please refer to [link / reference]. Figure 8 Under normal circumstances, the main power supply 2 and the backup power supply 3 in the emergency power supply system are both 380V three-phase AC power, which is relatively high and there is a possibility that they cannot directly supply power to the first electromagnetic coil L1, the second electromagnetic coil L2 and the second electromagnetic coil L3.

[0109] In one embodiment of this application, the first power supply processing unit 1121 is used to process the single-phase AC power in the three-phase AC power output by the main power supply 2, and the second power supply processing unit 1122 is used to process the single-phase AC power in the three-phase AC power output by the backup power supply 3, so that the processed voltage can be used to power the first electromagnetic coil L1, the second electromagnetic coil L2 and the third electromagnetic coil L3.

[0110] For details, please refer to [link / reference]. Figure 8 During operation, when the main power supply 2 and the backup power supply 3 are in normal condition, the power supply channel between the main power supply 2 and the backup power supply 3 and the first electromagnetic coil L1 is connected, the power supply channel between the main power supply 2 and the backup power supply 3 and the second electromagnetic coil L2 is disconnected, and the power supply channel between the main power supply 2 and the backup power supply 3 and the third electromagnetic coil L3 is disconnected. Thus, the first electromagnetic coil L1 is energized, the second electromagnetic coil L2 is not energized, and the third electromagnetic coil L3 is not energized. The main power supply 2 supplies power to the first input terminal of the motor 12 through the third set of normally closed contacts S5, the first set of normally open contacts S2, and the second set of normally closed contacts S3.

[0111] When the main power supply 2 is abnormal and the backup power supply 3 is normal, the main power supply 2 has no voltage output, the power supply channel between the backup power supply 3 and the first electromagnetic coil L1 is disconnected, the power supply channel between the backup power supply 3 and the second electromagnetic coil L2 is connected, and the power supply channel between the backup power supply 3 and the third electromagnetic coil L3 is connected. The backup power supply 3 supplies power to the second input terminal of the motor 12 through the third set of normally open contacts S6, the first set of normally closed contacts S1, and the second set of normally open contacts S4.

[0112] Thus, in this embodiment, the main power supply 2 and the backup power supply 3 can supply power to the first electromagnetic coil L1, the second electromagnetic coil L2 and the third electromagnetic coil L3 through the coil power supply unit 112. In this way, there is no need to set up an additional power supply for the first electromagnetic coil L1, the second electromagnetic coil L2 and the third electromagnetic coil L3, which is beneficial to cost saving.

[0113] Furthermore, in this embodiment, the main power supply 2 and the backup power supply 3 can respectively provide appropriate voltages to the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3 through the first power supply processing unit 1121 and the second power supply processing unit 1122, so that the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3 can operate under appropriate voltages. This avoids phenomena such as insufficient electromagnetic coil voltage causing the contacts to malfunction, or excessive electromagnetic coil voltage causing the electromagnetic coil to burn out. In addition, based on the states of the main power supply 2 and the backup power supply 3, the second switching unit 1123 controls the power supply to the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3, ensuring that the motor 12 is energized only at either the first input terminal or the second input terminal during operation, thus preventing the motor 12 from receiving both forward and reverse rotation signals simultaneously.

[0114] Figure 9 This is a schematic diagram illustrating the connection between a motor control circuit 11, a motor 12, a main power supply 2, and a backup power supply 3, as provided in an embodiment of this application. Please refer to... Figure 9 In one embodiment of this application, the first power supply processing unit 1121 includes a first step-down module and a first AC-DC conversion module; the input terminal of the first step-down module is electrically connected to the output terminal of the main power supply 2, for reducing the output voltage of the main power supply 2; the input terminal of the first AC-DC conversion module is electrically connected to the output terminal of the first step-down module, for converting the AC power output by the first step-down module into DC power; the second power supply processing unit 1122 includes a second step-down module and a second AC-DC conversion module; the input terminal of the second step-down module is electrically connected to the output terminal of the backup power supply 3, for reducing the output voltage of the backup power supply 3; the input terminal of the second AC-DC conversion module is electrically connected to the output terminal of the second step-down module ... The output terminal of the step-down module is electrically connected to convert the AC power output by the second step-down module into DC power. The coil power supply unit 112 also includes a voltage regulator module 1124. The input terminal of the voltage regulator module 1124 is connected to the output terminals of the first AC-DC converter module and the second AC-DC converter module to regulate the DC power output by the first AC-DC converter module and the second AC-DC converter module. The output terminal of the voltage regulator module 1124 is electrically connected to the two ends of the first electromagnetic coil L1, the two ends of the second electromagnetic coil L2, and the two ends of the third electromagnetic coil L3 to supply power to the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3.

[0115] Specifically, in one embodiment of this application, the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3 all use direct current (DC) with low voltages, such as 5V, 8V, and 12V. The main power supply 2 and the backup power supply 3 are both three-phase 380V AC. When supplying power to the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3, only single-phase 220V AC can be used. In this case, the first step-down module reduces the amplitude of the single-phase 220V AC output from the main power supply 2, and the first AC-DC converter module converts the AC output from the first step-down module into DC. The second step-down module reduces the amplitude of the single-phase 220V AC output from the backup power supply 3, and the second AC-DC converter module converts the AC output from the second step-down module into DC. The voltage regulator module 1124 stabilizes the output voltage of the first and second AC-DC converter modules at a certain value, such as 12V, and supplies power to the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3.

[0116] It should be noted that in this embodiment, the first power supply processing unit 1121 and the second power supply processing unit 1122 share the same voltage regulator module 1124 for voltage regulation. In other embodiments of this application, the first power supply processing unit 1121 and the second power supply processing unit 1122 may also use a separate voltage regulator module for voltage regulation. In this application, the first and second step-down modules can be implemented based on the law of electromagnetic induction. For example, the first step-down module includes a primary coil and a secondary coil. Alternating current is applied to the primary coil, generating an alternating magnetic field. This magnetic field is coupled to the secondary coil through the iron core, inducing an alternating voltage in the secondary coil. If the number of turns in the secondary coil is less than that in the primary coil, voltage reduction is achieved. The first and second AC-DC conversion modules generally include a filter circuit and a rectifier circuit. The voltage regulator module 1124 generally includes a sampling circuit, a comparator, and a feedback adjustment circuit.

[0117] Currently, the first step-down module, the second step-down module, the first AC-DC converter module, the second AC-DC converter module, and the voltage regulator module 1124 are all relatively mature technologies, and finished products can be purchased and used according to needs.

[0118] Please continue to refer to this. Figure 9 In one embodiment of this application, the second switching unit 1123 includes a first electronic switch, a second electronic switch, and a third electronic switch. The first electronic switch is connected in series with the first electromagnetic coil L1. The second electronic switch is connected in series with the second electromagnetic coil L2, and the third electronic switch is connected in series with the third electromagnetic coil L3. Thus, the energization and de-energization of the first electromagnetic coil L1, the second electromagnetic coil L2, and the third electromagnetic coil L3 can be controlled by controlling the on / off states of the first electronic switch, the second electronic switch, and the third electronic switch.

[0119] Specifically, in one embodiment of this application, a first electronic switch can be connected in series between the positive terminal of the output terminal of the voltage regulator module 1124 and the first terminal of the first electromagnetic coil L1, and the second terminal of the first electromagnetic coil L1 is electrically connected to the negative terminal of the output terminal of the voltage regulator module 1124.

[0120] In another embodiment of this application, the positive terminal of the output terminal of the voltage regulator module 1124 is electrically connected to the first terminal of the first electromagnetic coil L1, and the first electronic switch can also be connected in series between the second terminal of the first electromagnetic coil L1 and the negative terminal of the output terminal of the voltage regulator module 1124.

[0121] The principles behind the second and third electronic switches are the same as those of the first electronic switch, and will not be repeated here.

[0122] Figure 10 This is a schematic diagram illustrating the connection between a motor control circuit 11, a motor 12, a main power supply 2, and a backup power supply 3, as provided in an embodiment of this application. Please refer to... Figure 9 In one embodiment of this application, the motor control circuit 11 further includes a controller 114, which is electrically connected to the main power supply 2 and the backup power supply 3, and is capable of monitoring the voltages of the main power supply 2 and the backup power supply 3. The electrical connection relationship between the controller 114 and the main power supply and the backup power supply 3 for voltage monitoring is as follows: Figure 10 The text is omitted and not illustrated.

[0123] The controller 114 is also electrically connected to the second switching unit 1123, and is used to turn on or off the power supply to the first electromagnetic coil L1, the second electromagnetic coil L2 and the third electromagnetic coil L3 based on the voltage monitoring results of the main power supply 2 and the backup power supply 3.

[0124] Specifically, when the controller 114 detects that the main power supply 2 voltage is abnormal and the backup power supply 3 voltage is normal, it connects the backup power supply 3 to supply power to the third electromagnetic coil L3 through the second switching unit 1123, disconnects the backup power supply 3 from supplying power to the first electromagnetic coil L1, and connects the backup power supply 3 to supply power to the second electromagnetic coil L2.

[0125] When the voltage of the backup power supply 3 is detected to be abnormal and the voltage of the main power supply 2 is normal, the second switching unit 1123 disconnects the main power supply 2 from supplying power to the third electromagnetic coil L3, cuts off the main power supply 2 from supplying power to the second electromagnetic coil L2, and connects the main power supply 2 to supply power to the first electromagnetic coil L1.

[0126] When both the backup power supply 3 and the main power supply 2 are detected to be normal, the second switching unit 1123 disconnects the power supply from the main power supply 2 and the backup power supply 3 to the third electromagnetic coil L3, cuts off the power supply from the main power supply 2 and the backup power supply 3 to the second electromagnetic coil L2, and connects the power supply from the main power supply 2 to the first electromagnetic coil L1.

[0127] In this embodiment, the controller 114 can monitor the status of the main power supply 2 and the backup power supply 3, and control the second switching unit 1123 based on the monitoring results. This enables automatic control of the motor control circuit 11, saving manpower.

[0128] In addition, voltage monitoring, switching of power supply for the first electromagnetic coil L1, and switching of power supply for the second electromagnetic coil L2 and the third electromagnetic coil L3 can be achieved through the same controller 114, which helps to simplify the composition of the motor control circuit 11.

[0129] Please continue to refer to this. Figure 10 In one embodiment of this application, the motor control circuit 11 further includes a third power supply processing unit 115. The input terminal of the third power supply processing unit 115 is electrically connected to the output terminal of the voltage regulator module 1124, and is used to convert the output voltage of the voltage regulator module 1124 into the operating voltage of the controller 114. The output terminal of the third power supply processing unit 115 is electrically connected to the power supply terminal of the controller 114.

[0130] Specifically, the controller 114 is an electronic device, such as a microcontroller-based electronic device, and it also requires a power supply. The motor control circuit 11 provided in this embodiment uses a third power supply processing unit 115 to change the output voltage of the voltage regulator module 1124 to suit the power supply of the controller 114. Thus, the controller 114 can draw power from the main power supply 2 and the backup power supply 3, without the need for additional power supply equipment.

[0131] For example, in some embodiments of this application, the output voltage of the voltage regulator module 1124 is 12V. After being processed by the third power supply processing unit 115, the voltage can be changed to 5V for use by the controller 114.

[0132] It should be noted that, Figures 7 to 10 There are two main power sources 2 and two backup power sources 3 in the diagram. The two main power sources 2 refer to the same power source, and the two backup power sources 3 refer to the same power source.

[0133] Please combine Figures 1 to 10 Based on the same inventive concept, this application also provides a dual power supply changeover switch 1, including a motor 12, a motor control circuit 11, and a switching device 13. The motor control circuit 11 is any of the motor control circuits described above.

[0134] The motor control circuit 11 is electrically connected to the motor 12 and is used to control the rotation state of the motor 12, including rotation along a first direction and rotation along a second direction.

[0135] The switching device 13 is electrically connected to the motor 12 and is driven by the motor 12. When the motor 12 rotates in the first direction, it connects the main power supply 2 to the load 4. When the motor 12 rotates in the second direction, it connects the backup power supply 3 to the load 4.

[0136] The dual power supply transfer switch 1 provided in this application includes any of the above-mentioned motor control circuits 11. Its beneficial effects can be found in the beneficial effects brought by the above-mentioned motor control circuits 11, and will not be described in detail here.

[0137] It should be noted that the switching device 13 in the dual power transfer switch 1 generally includes a mechanical transmission part and an electronic part. The electronic part includes a first circuit breaker and a second circuit breaker. The first circuit breaker is installed on the circuit where the main power supply 2 supplies power to the load 4, and the second circuit breaker is installed on the circuit where the backup power supply 3 supplies power to the load 4. The input power of the mechanical part comes from the motor 12. When the motor 12 rotates in the first direction, the mechanical part causes the first circuit breaker to close and the second circuit breaker to open, allowing the main power supply 2 to supply power to the load 4. When the motor 12 rotates in the second direction, the mechanical part causes the first circuit breaker to open and the second circuit breaker to close, allowing the backup power supply 3 to supply power to the load 4. There are many structures for the mechanical part in the prior art, which will not be described in detail here.

[0138] Please continue to refer to this. Figures 1 to 10 Based on the same inventive concept, this application also provides an emergency power supply system, including a main power supply, a backup power supply, and a dual power supply transfer switch, wherein the dual power supply transfer switch is the one provided in this application. The beneficial effects of this emergency power supply system can be found in the beneficial effects of the motor control circuit 11 described above, and will not be detailed here.

[0139] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0140] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A motor control circuit, characterized in that, Including a first electromagnetic relay and a second electromagnetic relay; The first electromagnetic relay includes a first electromagnetic coil, a first set of normally open contacts, and a first set of normally closed contacts; the second electromagnetic relay includes a second electromagnetic coil, a second set of normally open contacts, and a second set of normally closed contacts. The first set of normally open contacts and the second set of normally closed contacts are connected in series, and the motor power supply device is electrically connected to the first input terminal of the motor through the first set of normally open contacts and the second set of normally closed contacts; The first set of normally closed contacts is connected in series with the second set of normally open contacts, and the motor power supply device is electrically connected to the second input terminal of the motor through the first set of normally closed contacts and the second set of normally open contacts; When the first input terminal is energized, the motor rotates in a first direction; when the second input terminal is energized, the motor rotates in a second direction, wherein one of the first direction and the second direction is clockwise and the other is counterclockwise.

2. The motor control circuit according to claim 1, characterized in that, The motor power supply device is the main power supply and the backup power supply. The motor control circuit further includes a first switching unit, which is used to control the on / off of the power supply channel between the main power supply and the motor, and the on / off of the power supply channel between the backup power supply and the motor, based on the status of the main power supply and the backup power supply.

3. The motor control circuit according to claim 2, characterized in that, The first switching unit includes a third electromagnetic relay, which includes at least a third electromagnetic coil, a third set of normally closed contacts, a fourth set of normally closed contacts, a third set of normally open contacts, and a fourth set of normally open contacts. One end of the third set of normally closed contacts is electrically connected to the live wire of the main power supply, and the other end of the third set of normally closed contacts is electrically connected to the first input terminal of the motor through the first set of normally open contacts and the second set of normally closed contacts. One end of the fourth set of normally closed contacts is electrically connected to the neutral wire of the main power supply, and the other end of the fourth set of normally closed contacts is electrically connected to the neutral signal input terminal of the motor. One end of the third set of normally open contacts is electrically connected to the live wire of the backup power supply, and the other end of the third set of normally open contacts is electrically connected to the second input terminal of the motor through the first set of normally closed contacts and the second set of normally open contacts. One end of the fourth set of normally open contacts is electrically connected to the neutral wire of the backup power supply, and the other end of the fourth set of normally open contacts is electrically connected to the neutral signal input terminal of the motor.

4. The motor control circuit according to claim 3, characterized in that, The motor control circuit also includes a coil power supply unit, which includes a first power supply processing unit, a second power supply processing unit, and a second switching unit. The first power supply processing unit is electrically connected to the main power supply and is used to process the output voltage of the main power supply and supply power to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil. The second power supply processing unit is electrically connected to the backup power supply and is used to process the output voltage of the backup power supply and supply power to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil. The second switching unit controls the connection and disconnection of the power supply channels between the main power supply and the backup power supply and the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil based on the status of the main power supply and the backup power supply.

5. The motor control circuit according to claim 4, characterized in that, The first power supply processing unit includes a first step-down module and a first AC-DC conversion module; The input terminal of the first step-down module is electrically connected to the output terminal of the main power supply, and is used to reduce the output voltage of the main power supply; The input terminal of the first AC-DC converter module is electrically connected to the output terminal of the first step-down module, and is used to convert the AC power output by the first step-down module into DC power. The second power supply processing unit includes a second step-down module and a second AC-DC conversion module; The input terminal of the second step-down module is electrically connected to the output terminal of the backup power supply, and is used to reduce the output voltage of the backup power supply; The input terminal of the second AC-DC converter module is electrically connected to the output terminal of the second step-down module, and is used to convert the AC power output by the second step-down module into DC power. The coil power supply unit also includes a voltage regulator module. The input terminal of the voltage regulator module is connected to the output terminal of the first AC-DC conversion module and the output terminal of the second AC-DC conversion module, and is used to regulate the DC power output by the first AC-DC conversion module and the second AC-DC conversion module. The output terminal of the voltage regulator module is electrically connected to the two ends of the first electromagnetic coil, the two ends of the second electromagnetic coil, and the two ends of the third electromagnetic coil, and is used to supply power to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil.

6. The motor control circuit according to claim 5, characterized in that, The second switching unit includes a first electronic switch, a second electronic switch, and a third electronic switch; The first electronic switch is connected in series with the first electromagnetic coil, the second electronic switch is connected in series with the second electromagnetic coil, and the third electronic switch is connected in series with the third electromagnetic coil.

7. The motor control circuit according to claim 5 or 6, characterized in that, The motor control circuit also includes a controller, which is electrically connected to the main power supply and the backup power supply, and is capable of monitoring the voltage of the main power supply and the backup power supply. The controller is also electrically connected to the second switching unit and is used to turn on or off the power supply to the first electromagnetic coil, the second electromagnetic coil, and the third electromagnetic coil based on the voltage monitoring results of the main power supply and the backup power supply.

8. The motor control circuit according to claim 7, characterized in that, The motor control circuit also includes a third power supply processing unit; The input terminal of the third power supply processing unit is electrically connected to the output terminal of the voltage regulator module, and is used to convert the output voltage of the voltage regulator module into the operating voltage of the controller. The output terminal of the third power supply processing unit is electrically connected to the power supply terminal of the controller.

9. A dual-power transfer switch, characterized in that, Includes the motor, motor control circuit, and switching device; The motor control circuit is the motor control circuit according to any one of claims 1 to 8; The motor control circuit is electrically connected to the motor and is used to control the rotation state of the motor, the rotation state including rotation along a first direction and rotation along a second direction; The switching device is connected to the motor and is driven by the motor to connect the main power supply to the load when the motor rotates in the first direction; and to connect the backup power supply to the load when the motor rotates in the second direction.

10. An emergency power supply system, characterized in that, It includes a main power supply, a backup power supply, and a dual power supply transfer switch. The dual power supply transfer switch is the dual power supply transfer switch as described in claim 9. The main power supply and the backup power supply are electrically connected to the load through the dual power supply transfer switch.

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