Three-phase power supply system and electrical equipment

Abstract

The utility model discloses a three-phase power supply system and electrical equipment. The system comprises a controller, a first switch module, a second switch module and a sensing device, the sensing devices are arranged on three power supply branches of the system, and sensing signal output ends of the sensing devices are connected with the controller; the respective control ends of the first switch module and the second switch module are connected with the controller; the first switch module is arranged between the first phase input end and the first phase output end and between the second phase input end and the second phase output end, and the second switch module is arranged between the first phase input end and the second phase output end and between the second phase input end and the first phase output end. According to the embodiment of the invention, the phase sequence of each branch is automatically adjusted when the three-phase electrical wiring has an error, the error wiring sequence does not need to be manually adjusted, and the automation level of fault processing of the three-phase electrical equipment is improved.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a three-phase power supply system and electrical equipment. Background Technology

[0002] In traditional three-phase electrically driven equipment, such as electric motors, incorrect phase sequence can cause the motor to reverse or even damage the equipment. Other equipment may experience overheating, vibration, or other malfunctions if the phase sequence is incorrect. Therefore, three-phase electrically driven equipment typically incorporates phase sequence detection devices to monitor the phase sequence of the input power supply and prevent risks associated with incorrect wiring.

[0003] Phase sequence detection is used to ensure the correct phase sequence and prevent equipment damage. However, typical phase sequence protectors only cut off the output when an incorrect phase sequence is detected, preventing the equipment from receiving power. This requires manual adjustment of the input wiring sequence, which is inconvenient and inefficient. Therefore, how to efficiently correct wiring sequence errors in three-phase electrical equipment is a problem that urgently needs to be solved. Utility Model Content

[0004] In view of this, in order to solve some or all of the above-mentioned technical problems, this application provides a three-phase power supply system and electrical equipment.

[0005] In a first aspect, embodiments of this application provide a three-phase power supply system, which includes: a controller, a first switch module, a second switch module, and a sensing device; the system has three power supply branches, including a first phase input terminal, a second phase input terminal, a third phase input terminal, a first phase output terminal, a second phase output terminal, and a third phase output terminal; the sensing device is disposed on the three power supply branches of the system, and the sensing signal output terminal of the sensing device is connected to the controller; the control terminals of the first switch module and the second switch module are each connected to the controller; the first switch module is disposed between the first phase input terminal and the first phase output terminal, and between the second phase input terminal and the second phase output terminal, and the second switch module is disposed between the first phase input terminal and the second phase output terminal, and between the second phase input terminal and the first phase output terminal.

[0006] In one possible implementation, the system further includes a third switch module, the input of which is connected to at least two of the first phase output, the second phase output, and the third phase output; the output of which is connected to the three-phase load device; the control terminal of which is connected to a controller; the sensing device is a current sensor; and the controller is further configured to: use the current sensor to determine the current in each of the three power supply branches; if the current in any of the three power supply branches is greater than or equal to a preset current threshold, send a second control signal to the third switch module to disconnect at least two of the three power supply branches from the three-phase load device.

[0007] In one possible implementation, the first switch module includes a first switch unit, a second switch unit, and a first control unit. The first switch unit is disposed on the line between the first phase input terminal and the first phase output terminal, and the second switch unit is disposed on the line between the second phase input terminal and the second phase output terminal. The signal transmission terminal of the first control unit is connected to the first switch unit and the second switch unit, and the control terminal of the first control unit is connected to the controller. The second switch module includes a third switch unit, a fourth switch unit, and a second control unit. The third switch unit is disposed on the line between the first phase input terminal and the second phase output terminal, and the fourth switch unit is disposed on the line between the second phase input terminal and the first phase output terminal. The signal transmission terminal of the second control unit is connected to the third switch unit and the fourth switch unit, and the control terminal of the second control unit is connected to the controller.

[0008] In one possible implementation, the control terminals of the first control unit and the second control unit are connected to the same control signal output terminal of the controller; under the control of the same control signal, one control unit is turned on and the other control unit is turned off.

[0009] Secondly, embodiments of this application provide an electrical device including the three-phase power supply system described in the second aspect above.

[0010] The three-phase power supply system and electrical equipment provided in this application embodiment, by setting up a controller, two switch modules and a sensing device, realizes the automatic adjustment of the phase sequence of each branch when a three-phase power wiring error occurs, so that the phase sequence of the three branches conforms to the three-phase power phase arrangement order, eliminating the need for manual adjustment of the incorrect wiring sequence and improving the automation level of three-phase electrical equipment fault handling. Attached Figure Description

[0011] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0014] Figure 1 This application provides a schematic diagram of the structure of a three-phase power supply system according to an embodiment of the present application.

[0015] Figure 2 This is a schematic diagram of another three-phase power supply system provided in an embodiment of this application;

[0016] Figure 3 A schematic diagram of another three-phase power supply system provided in this application embodiment;

[0017] Figure 4 A schematic diagram of another three-phase power supply system provided in this application embodiment;

[0018] Figure 5 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application. Detailed Implementation

[0019] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0020] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of this application are only used to distinguish different steps, devices or modules, and do not represent any specific technical meaning, nor do they indicate the logical order between them.

[0021] It should also be understood that in this embodiment, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0022] It should also be understood that any component, data or structure mentioned in the embodiments of this application can generally be understood as one or more unless explicitly defined or given contrary guidance in the context.

[0023] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "or" relationship.

[0024] It should also be understood that the description of the various embodiments in this application emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0026] Techniques, circuits, and devices known to a person skilled in the art may not be discussed in detail, but where appropriate, such techniques, circuits, and devices should be considered part of the specification.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. To facilitate understanding of the embodiments of this application, the application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] To address the technical problem of low fault handling efficiency caused by the need for manual correction of wiring errors in existing three-phase electrical equipment, this application provides a three-phase power supply system that can automatically adjust the phase sequence of each branch of the three-phase power supply when the wiring sequence is incorrect, thus improving fault handling efficiency.

[0030] Figure 1 This is a schematic diagram of a three-phase power supply system 100 provided in an embodiment of this application. The system 100 specifically includes: a controller 101, a first switch module 102, a second switch module 103, and a sensing device 104.

[0031] The system has three power supply branches, including the first phase input terminal L1, the second phase input terminal L2, the third phase input terminal L3, the first phase output terminal L1′, the second phase output terminal L2′, and the third phase output terminal L3′.

[0032] The first switch module 102 and the second switch module 103 may include devices such as relays and transistors. Figure 1 As shown, the first switch module 102 includes devices K1 and K2 that implement switching functions, and the second switch module 103 includes devices K3 and K4 that implement switching functions. Three input terminals are used to connect to three-phase power, and three output terminals are used to output three-phase power to three-phase load devices (e.g., motors).

[0033] The sensing device 104 is installed on the three power supply branches of the system, and the sensing signal output terminal of the sensing device 104 is connected to the controller 101.

[0034] The sensing device 104 can be a current sensor, voltage sensor, or other similar device. As an example, Figure 1 The current sensors U1, U2, and U3 in the diagram are sensing devices 104. The sensing devices 104 can send sensing signals to the controller 101, and the controller 101 determines the phase difference between each pair of power supply branches based on the sensing signals.

[0035] The control terminals of the first switch module 102 and the second switch module 103 are both connected to the controller 101. The controller 101 can control the switching logic state of the first switch module 102 and the second switch module 103 according to the phase difference judgment result.

[0036] The first switch module 102 is disposed between the first phase input terminal L1 and the first phase output terminal L1′, and between the second phase input terminal L2 and the second phase output terminal L2′. The second switch module 103 is disposed between the first phase input terminal L1 and the second phase output terminal L2′, and between the second phase input terminal L2 and the first phase output terminal L1′.

[0037] The controller 101 is used to execute the three-phase automatic phase commutation method. That is, when the controller 101 determines that there is a phase sequence error in the three power supply branches, it controls the first switch module 102 to disconnect (e.g., ...). Figure 1 When K1 and K2 are disconnected, the second switch module 103 is turned on (e.g., K1 and K2 are disconnected). Figure 1 (K3 and K4 in the circuit are turned on) to disconnect the first phase input terminal and the first phase output terminal, disconnect the second phase input terminal and the second phase output terminal, and connect the first phase input terminal and the second phase output terminal, and connect the second phase input terminal and the first phase output terminal. That is, the controller 101 cross-connects L1, L2 and L1′, L2′.

[0038] It should be noted that, Figure 1In the system architecture shown, L1, L2, L3, and L1′, L2′, L3′ only represent the interface sequence of the three-phase power supply, not the actual input / output port positions of the circuit. That is, the first phase input, second phase input, and third phase input can also be respectively... Figure 1 L2, L3, and L1 in the text represent, or are represented by L3, L1, and L2.

[0039] The three-phase power supply system provided in this application embodiment, by setting up a controller, two switch modules and a sensing device, realizes the automatic adjustment of the phase sequence of each branch when an error occurs in the three-phase power wiring, so that the phase sequence of the three branches conforms to the three-phase power phase arrangement order, eliminating the need for manual adjustment of the incorrect wiring sequence and improving the automation level of three-phase power equipment fault handling.

[0040] In some alternative implementations, such as Figure 2 As shown, the system also includes a third switch module 105. The input terminal of the third switch module 105 is connected to at least two of the first phase output terminal, the second phase output terminal, and the third phase output terminal. The output terminal of the third switch module 105 is connected to a three-phase load device. The control terminal of the third switch module 105 is connected to the controller 101.

[0041] The third switch module 105 may include devices such as relays and transistors. Figure 2 As shown, the third switch module 105 includes a device K5 that performs the switching function, which is disposed on the line between L1′, L2′ and the three-phase load device.

[0042] As an example, as follows Figure 4 As shown, the third switch module 105 includes a relay K5 and a transistor T3. K5 is connected to the output terminals of the two power supply lines, and T3 is an NPN transistor used to drive the relay. When an overcurrent is detected in any of the three power supply branches, another control signal output terminal (port 5) of the controller 101 outputs a low level to T3, and the relay K5 is disconnected.

[0043] In this embodiment, the sensing device 104 is a current sensor. For example... Figure 5 and Figure 2 The current sensors U1, U2, and U3 in the middle can be used as sensing devices 104.

[0044] The controller 101 is also used to: use a current sensor to determine the current in each of the three power supply branches; if the current in any of the three power supply branches is greater than or equal to a preset current threshold, send a second control signal to the third switch module 105 to disconnect at least two of the three power supply branches from the three-phase load equipment.

[0045] That is, when an excessive current is detected on any power supply branch, the system is disconnected from the three-phase load equipment, and the three-phase load equipment stops operating.

[0046] This embodiment improves the safety of system operation by setting a third switch module and implementing overcurrent protection based on the collected current.

[0047] In some alternative implementations, such as Figure 3 As shown, the first switch module 102 includes a first switch unit K1, a second switch unit K2, and a first control unit D1. The first switch unit is disposed on the line between the first phase input terminal L1 and the first phase output terminal L1′, and the second switch unit is disposed on the line between the second phase input terminal L2 and the second phase output terminal L2′. The signal transmission terminal of the first control unit D1 is connected to the first switch unit K1 and the second switch unit K2, and the control terminal of the first control unit D1 is connected to the controller 101.

[0048] The second switch module 103 includes a third switch unit K3, a fourth switch unit K4, and a second control unit D2. The third switch unit K3 is located on the line between the first phase input terminal L1 and the second phase output terminal L2′, and the fourth switch unit K4 is located on the line between the second phase input terminal L2 and the first phase output terminal L1′. The signal transmission terminal of the second control unit D2 is connected to the third switch unit K3 and the fourth switch unit K4, and the control terminal of the second control unit D2 is connected to the controller 101.

[0049] The types of K1, K2, K3, and K4 mentioned above can be various, such as relays, thyristors, etc.

[0050] The first control unit D1 and the second control unit D2 are used to drive the switching states of the first switching module 102 and the second switching module 103, respectively. D1 and D2 can be various types of driving devices such as transistors and field-effect transistors. The control terminals of the first control unit D1 and the second control unit D2 can be connected to the same signal output terminal of the controller 101, or they can be connected to different signal output terminals. When the controller 101 determines that there is a phase sequence error based on the phase difference, it sends control signals to the first control unit D1 and the second control unit D2 to drive K1 and K2 to disconnect and K3 and K4 to turn on.

[0051] This embodiment achieves control of the switching units by the controller through four switching units and two control units, allowing the two power supply lines to be cross-connected. The circuit structure is simpler, more effective, and less expensive.

[0052] In some alternative implementations, the control terminals of the first control unit and the second control unit are connected to the same control signal output terminal of the controller 101. Under the control of the same control signal, one control unit is turned on while the other is turned off.

[0053] That is, the same control signal emitted from the same control signal output terminal controls the state of two different control units. For example... Figure 4 As shown, the first control control unit includes a PNP transistor T1, whose emitter is connected to a 12V power supply and whose collector is grounded; the second control control unit includes an NPN transistor T2, whose emitter is grounded and whose collector is connected to a 12V power supply. If a phase sequence error is detected, the controller 101 outputs a signal through the same control signal terminal ( Figure 4 When port 4 in the circuit outputs a high level, T1 is cut off, relays K1 and K2 are disconnected, T2 is turned on, relays K3 and K4 are turned on, L1 is connected to L2', and L2 is connected to L1'. Furthermore, Figure 4 Resistors R1-R5 are current-limiting resistors. Optional. Figure 4 The types of transistors T1 and T2 can be interchanged, and the corresponding control signals also need to be changed (i.e., when the output is low, T1 is off and T2 is on, and when the output is high, T1 is on and T2 is off).

[0054] This embodiment saves on the number of ports in the controller 101 and simplifies the implementation of the system by controlling two switch modules to execute opposite switching logic simultaneously through a single signal output terminal.

[0055] Figure 5 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application. Figure 5 The electrical device 500 shown includes the aforementioned three-phase power supply system 100. This electrical device can use the aforementioned three-phase power supply system 100 to supply power to the three-phase load device 501. As an example, the three-phase load device is a three-phase motor; this electrical device can be an air conditioner, a water pump, or other equipment containing a three-phase motor.

[0056] The electrical equipment provided in this embodiment can achieve the technical effects described above by applying the above three-phase power supply system. Please refer to the relevant descriptions above for details. For the sake of brevity, further details are not provided here.

[0057] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different circuits to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0058] The steps of the circuits or algorithms described in connection with the embodiments disclosed herein can be implemented in hardware, software modules executed by a processor, or a combination of both. The software modules can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0059] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A three-phase power supply system, characterized in that, The system includes: a controller, a first switch module, a second switch module, and a sensing device; the system has three power supply branches, including a first phase input terminal, a second phase input terminal, a third phase input terminal, a first phase output terminal, a second phase output terminal, and a third phase output terminal; The sensing device is installed on the three power supply branches of the system, and the sensing signal output terminal of the sensing device is connected to the controller. The control terminals of the first switch module and the second switch module are both connected to the controller; the first switch module is disposed between the first phase input terminal and the first phase output terminal, and between the second phase input terminal and the second phase output terminal, and the second switch module is disposed between the first phase input terminal and the second phase output terminal, and between the second phase input terminal and the first phase output terminal.

2. The system according to claim 1, characterized in that, The system further includes a third switch module, the input terminal of which is connected to at least two of the first phase output terminal, the second phase output terminal, and the third phase output terminal, and the output terminal of the third switch module is connected to a three-phase load device. The control terminal of the third switch module is connected to the controller; The sensing device is a current sensor, and the controller is further configured to: use the current sensor to determine the current in each of the three power supply branches; if the current in any of the three power supply branches is greater than or equal to a preset current threshold, send a second control signal to the third switch module to disconnect at least two of the three power supply branches from the three-phase load equipment.

3. The system according to claim 1, characterized in that, The first switch module includes a first switch unit, a second switch unit, and a first control unit. The first switch unit is disposed on the line between the first phase input terminal and the first phase output terminal, and the second switch unit is disposed on the line between the second phase input terminal and the second phase output terminal. The signal transmission terminal of the first control unit is connected to the first switch unit and the second switch unit, and the control terminal of the first control unit is connected to the controller. The second switch module includes a third switch unit, a fourth switch unit, and a second control unit. The third switch unit is disposed on the line between the first phase input terminal and the second phase output terminal, and the fourth switch unit is disposed on the line between the second phase input terminal and the first phase output terminal. The signal transmission terminal of the second control unit is connected to the third switch unit and the fourth switch unit, and the control terminal of the second control unit is connected to the controller.

4. The system according to claim 3, characterized in that, The control terminals of the first control unit and the second control unit are connected to the same control signal output terminal of the controller; Under the control of the same control signal, one control unit is turned on and the other is turned off.

5. An electrical appliance, characterized in that, Includes the three-phase power supply system as described in any one of claims 1-4.

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