Three-phase power automatic commutation method, three-phase power supply system and electrical equipment

Abstract

The embodiment of the invention relates to a three-phase power automatic commutation method, a three-phase power supply system and electrical equipment. The method comprises the following steps: determining whether three power supply branches of three-phase power have phase sequence errors or not; if yes, the first switch module is controlled to be switched off, and the second switch module is controlled to be switched on, so that a first phase input end and a first phase output end for transmitting the three-phase power are switched off, a second phase input end and a second phase output end are switched off, and the first phase input end and the second phase output end are switched on; and the second phase input end is conducted with 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 automatic phase change method, a three-phase power supply system, and an electrical device. Background Art

[0002] For traditional three-phase power-driven devices, such as motors, if the phase sequence is connected incorrectly, it may cause the motor to rotate in reverse and even damage the device. For some other devices, if the phase sequence is incorrect, it may cause the device to overheat, vibrate, or have other faults. Therefore, in general, some phase sequence detection devices are added to three-phase power-driven devices to detect the phase sequence of the input power supply to avoid the risks caused by incorrect wiring.

[0003] Phase sequence detection is to ensure the correctness of the phase sequence and prevent device damage. However, generally, a phase sequence protector is only used to cut off the output when a phase sequence error is detected, so that the device is de-energized. Then, the input wire sequence needs to be manually adjusted, which is inconvenient and inefficient. Therefore, how to efficiently correct the problem when the wire sequence connection of a three-phase power device is incorrect is an urgent problem to be solved. Summary of the Invention

[0004] In view of this, to solve the above-mentioned partial or all technical problems, embodiments of this application provide a three-phase power automatic phase change method, a three-phase power supply system, and an electrical device.

[0005] In a first aspect, embodiments of this application provide a three-phase power automatic phase change method, which includes: determining whether there is a phase sequence error in the three power supply branches of the three-phase power; if there is, controlling the first switch module to disconnect and the second switch module to conduct, so that the connection between the first-phase input terminal and the first-phase output terminal for transmitting the three-phase power is disconnected, the connection between the second-phase input terminal and the second-phase output terminal is disconnected, and, the connection between the first-phase input terminal and the second-phase output terminal is conducted, and the connection between the second-phase input terminal and the first-phase output terminal is conducted, where the first switch module is arranged 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 arranged 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 a possible implementation manner, after determining whether there is a phase sequence error in the three power supply branches of the three-phase power, the method further includes: if there is no phase sequence error, controlling the first switch module to conduct and the second switch module to disconnect, so that the connection between the first-phase input terminal and the first-phase output terminal is conducted, the connection between the second-phase input terminal and the second-phase output terminal is conducted, and, the connection between the first-phase input terminal and the second-phase output terminal is disconnected, and the connection between the second-phase input terminal and the first-phase output terminal is disconnected.

[0007] In a possible implementation, controlling the first switch module to disconnect and the second switch module to conduct includes: sending a first control signal to the first switch module and the second switch module through the first signal output terminal, so that the first switch module disconnects and the second switch module conducts.

[0008] In a possible implementation, the method further includes: determining the current on each of the three power supply branches; if the current on any one of the three power supply branches is greater than or equal to a preset current threshold, sending 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.

[0009] In a possible implementation, determining whether there is a phase sequence error in the three power supply branches of the three-phase power includes: determining the current on each of the three power supply branches; based on the current on each power supply branch, determining the phase difference between each pair of power supply branches; if the phase difference between any pair of power supply branches does not conform to a preset phase difference, determining that there is a phase sequence error in the three power supply branches.

[0010] In a second aspect, an embodiment of the present application provides a three-phase power supply system, which includes: a controller, a first switch module, a second switch module, and an induction device; the three power supply branches of the system include 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 induction device is arranged on the three power supply branches of the system, and the induction signal output terminal of the induction 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 arranged 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 arranged 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; the controller is configured to receive the induction signal collected by the induction device and execute the above-mentioned three-phase power automatic phase change method based on the induction signal.

[0011] In a possible implementation, the system further includes a third switch module, the input terminal of the third switch module is connected to at least two output terminals 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 the three-phase load device; the control terminal of the third switch module is connected to the controller; the induction device is a current sensor, and the controller is further configured to: use the current sensor to determine the current on each of the three power supply branches; if the current on any one 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.

[0012] In a 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.

[0013] In a 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 of the control units is turned on and the other control unit is turned off.

[0014] In a third aspect, an embodiment of the present application provides an electrical device, including the three-phase power supply system described in the second aspect above.

[0015] In a fourth aspect, an embodiment of the present application provides an electronic device, including: a memory for storing a computer program; a processor for executing the computer program stored in the memory, and when the computer program is executed, implementing the method of any one of the embodiments of the three-phase power automatic phase conversion method in the first aspect of the present application.

[0016] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method of any one of the embodiments of the three-phase power automatic phase conversion method in the first aspect above is implemented.

[0017] In a sixth aspect, an embodiment of the present application provides a computer program, which includes computer-readable code. When the computer-readable code runs on a device, the processor in the device is caused to implement the method of any one of the embodiments of the three-phase power automatic phase conversion method in the first aspect above.

[0018] The three-phase power automatic phase conversion method, three-phase power supply system and electrical equipment provided by the embodiments of the present application determine whether there is a phase sequence error in the three power supply branches of the three-phase power. If there is a phase sequence error, the first switch module is controlled to disconnect and the second switch module is controlled to conduct, so that the first-phase input terminal and the second-phase input terminal for transmitting the three-phase power are cross-connected with the first-phase output terminal and the second-phase output terminal, thereby realizing the automatic adjustment of the phase sequence of each branch when the three-phase power wiring is incorrect, making the phase sequences of the three branches conform to the three-phase power phase arrangement sequence, without the need for manual adjustment of the incorrect wiring sequence, and improving the automation level of the fault handling of three-phase power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0021] One or more embodiments are illustrated by way of example in the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0022] Figure 1 It is a schematic flow chart of a three-phase power automatic phase conversion method provided by the embodiments of the present application;

[0023] Figure 2A It is a schematic diagram of the states of the first switch module and the second switch module in the case where there is no phase sequence error provided by the embodiments of the present application;

[0024] Figure 2B It is a schematic diagram of the states of the first switch module and the second switch module in the case where there is a phase sequence error provided by the embodiments of the present application;

[0025] Figure 3 It is a schematic flow chart of another three-phase power automatic phase conversion method provided by the embodiments of the present application;

[0026] Figure 4 It is a schematic flow chart of yet another three-phase power automatic phase conversion method provided by the embodiments of the present application;

[0027] Figure 5 It is a schematic flow chart of yet another three-phase power automatic phase conversion method provided by the embodiments of the present application;

[0028] Figure 6 Schematic diagram of a three - phase power supply system provided by an embodiment of the present application;

[0029] Figure 7 Schematic diagram of another three - phase power supply system provided by an embodiment of the present application;

[0030] Figure 8 Schematic diagram of yet another three - phase power supply system provided by an embodiment of the present application;

[0031] Figure 9 Schematic diagram of yet another three - phase power supply system provided by an embodiment of the present application;

[0032] Figure 10 Schematic diagram of a three - phase power automatic phase - change device provided by an embodiment of the present application;

[0033] Figure 11 Schematic diagram of an electrical equipment provided by an embodiment of the present application;

[0034] Figure 12 Schematic diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0035] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application.

[0036] Those skilled in the art can understand that terms such as "first", "second", etc. in the embodiments of the present application are only used to distinguish different steps, devices or modules, etc., without representing any specific technical meaning and without indicating the logical order between them.

[0037] It should also be understood that in this embodiment, "a plurality" may refer to two or more, and "at least one" may refer to one, two or more.

[0038] It should also be understood that for any component, data or structure mentioned in the embodiments of the present application, without clear definition or contrary indication in the context, it can generally be understood as one or more.

[0039] In addition, the term "and / or" in this application merely describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, both A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0040] It should also be understood that the descriptions of the various embodiments in this application emphasize the differences between the embodiments. Their similarities or similarities can be referred to each other. For the sake of brevity, they will not be elaborated one by one.

[0041] The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes any limitation to this application and its application or use.

[0042] The technologies, circuits, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the above technologies, circuits, and devices should be regarded as part of the specification.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0044] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. To facilitate the understanding of the embodiments of this application, the following will refer to the drawings and combine the embodiments to detail this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application.

[0045] In order to solve the technical problem that when the wiring sequence of a three-phase electrical device in the prior art is incorrect, it is necessary to manually correct the wiring error, and the fault handling efficiency is low, this application provides a three-phase electricity automatic phase change method, which can automatically adjust the phase sequence of each branch of the three-phase electricity when the wiring sequence of the three-phase electricity is incorrect, and the fault handling efficiency is higher.

[0046] Figure 1Schematic flowchart of a three-phase power automatic phase change method provided by an embodiment of the present application. This method can be applied to a three-phase power supply system and can be executed by a controller in the system. In addition, the execution entity of this method can be hardware or software. When the above execution entity is hardware, the execution entity can be one or more of the above electronic devices. For example, a single electronic device can execute this method, or multiple electronic devices can cooperate with each other to execute this method. When the above execution entity is software, this method can be implemented as multiple software or software modules, or can be implemented as a single software or software module. No specific limitation is made here.

[0047] As Figure 1 shown, the method specifically includes:

[0048] Step 101, determine whether there is a phase sequence error in the three power supply branches of the three-phase power.

[0049] In some embodiments, sensors can be set on each power supply branch to collect the induction signals of each branch. The induction signals can be voltage signals, current signals, etc. In some embodiments, relevant phase difference detection methods can be used to determine the phase difference between each pair of power supply branches among the three power supply branches. For example, methods such as the voltage method and the current method can be used to detect the phase difference, that is, according to the phase induction signal, determine the voltage difference or current difference between any two phases, and according to the corresponding relationship between the voltage difference or current difference and the phase difference, determine the phase difference between each pair of power supply branches.

[0050] In some embodiments, if the phase difference between a certain pair of power supply branches does not meet the preset phase difference, it can be determined that there is a phase sequence error in the three power supply branches. For example, using A, B, and C to represent each phase of the three-phase power, under normal circumstances, the phase difference between B and A, C and B, and A and C is 120°. If it is detected that any one of the three phase differences between B and A, C and B, and A and C is not 120°, but 240°, it is determined that there is a phase sequence error.

[0051] Step 104, if there is, control the first switch module to disconnect and the second switch module to conduct, so that the connection between the first-phase input terminal and the first-phase output terminal for transmitting the three-phase power is disconnected, the connection between the second-phase input terminal and the second-phase output terminal is disconnected, and, the connection between the first-phase input terminal and the second-phase output terminal is conducted, and the connection between the second-phase input terminal and the first-phase output terminal is conducted.

[0052] Among them, the first switch module is set 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 set 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.

[0053] In some embodiments, as Figure 2AAs shown in the figure, a three-phase power supply system may include three input terminals, namely the first-phase input terminal (denoted as L1), the second-phase input terminal (denoted as L2), and the third-phase input terminal (denoted as L3), and may also include three output terminals, namely the first-phase output terminal (denoted as L1′), the second-phase input terminal (denoted as L2′), and the third-phase input terminal (denoted as L3′). Suppose the first switch module includes two switches K1 and K2, and the second switch module includes two switches K3 and K4. In the case of no connection error, K1 and K2 are conducting, and K3 and K4 are off.

[0054] Suppose the three phases input at the three input terminals are A, B, and C respectively. In the case of no connection error, the three-phase power input at L1, L2, and L3 in sequence may be A, B, C, or B, C, A, or C, A, B; the three-phase power output at L1′, L2′, and L3′ in sequence is A′, B′, C′, or B′, C′, A′, or C′, A′, B′.

[0055] When a wiring error occurs in any pair of branches, the three-phase power input at L1, L2, and L3 in sequence may be A, C, B, or B, A, C, or C, B, A; the three-phase power output at L1′, L2′, and L3′ in sequence is A′, C′, B′, or B′, A′, C′, or C′, B′, A′. At this time, as Figure 2B shown, according to step 104, K1 and K2 are off, and K3 and K4 are conducting, that is, L1, L2 are cross-connected with L1′, L2′. Then, if the input phase sequence is A, C, B, the output phase sequence is C′, A′, B′; similarly, if the input phase sequence is B, A, C, the output phase sequence is A′, B′, C′; if the input phase sequence is C, B, A, the output phase sequence is B′, C′, A′. Thus, the output phase sequence is the correct phase sequence.

[0056] It should be noted that Figure 2A and Figure 2B is merely an exemplary circuit diagram. The types, contact numbers, control methods, and other attributes of the first switch module and the second switch module can be set arbitrarily. Any method that can controllably cross-connect two power supply branches belongs to the scope of the embodiments of the present application.

[0057] The three-phase power automatic phase change method provided by the embodiments of the present application determines whether there is a phase sequence error in the three power supply branches of the three-phase power. If there is a phase sequence error, it controls the first switch module to be off and the second switch module to be on, so as to cross-connect between the first-phase input terminal and the second-phase input terminal for transmitting three-phase power and the first-phase output terminal and the second-phase output terminal. Thus, when a wiring error occurs in the three-phase power, the phase sequence of each branch is automatically adjusted to make the phase sequence of the three branches conform to the three-phase power phase arrangement sequence, without manually adjusting the incorrect wiring sequence, improving the automation level of three-phase power equipment fault handling.

[0058] In some alternative implementations, such as Figure 3 shown, after step 101, the method further includes:

[0059] Step 103, if there is no phase sequence error, control the first switch module to conduct and the second switch module to disconnect, so that the first phase input terminal is connected to the first phase output terminal, the second phase input terminal is connected to the second phase output terminal, and, the first phase input terminal is disconnected from the second phase output terminal, and the second phase input terminal is disconnected from the first phase output terminal.

[0060] Such as Figure 2A shown, K1 and K2 included in the first switch module conduct, and K3 and K4 included in the second switch module disconnect, then the phase sequences of the three output terminals and the three input terminals are the same.

[0061] This embodiment realizes outputting current according to the output terminals corresponding to the three input terminals when the accessed three-phase power has no phase sequence error, realizes flexible identification and adjustment of the phase sequence, and further improves the automation degree of phase sequence control.

[0062] In some alternative implementations, the above step 102 can be executed as follows:

[0063] Send a first control signal to the first switch module and the second switch module through the first signal output terminal, so that the first switch module disconnects and the second switch module conducts.

[0064] Specifically, the electronic device executing this method can send the same control signal to the first switch module and the second switch module through a signal output terminal, and this control signal simultaneously controls the first switch module and the second switch module to execute opposite switching logics.

[0065] For example, the first control signal can be a high-level signal. The first switch module is controlled by a PNP type triode, and the second switch module is controlled by an NPN type triode. When the first switch module and the second switch module receive the high-level signal, the first switch module disconnects and the second switch module conducts.

[0066] This embodiment controls two switch modules to execute opposite switching logics simultaneously by one signal output terminal, saves the number of ports of the control circuit, and simplifies the implementation difficulty of the control circuit.

[0067] In some alternative implementations, such as Figure 4 shown, the method further includes:

[0068] Step 104, determine the current on each of the three power supply branches.

[0069] This step can be achieved by setting current sensors on three power supply branches and collecting current values from the current sensors.

[0070] Step 105, if the current on any one 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.

[0071] Among them, the third switch module is arranged on at least two of the three power supply branches. The electronic device executing this method can send a second control signal to the third switch module through the second signal output end.

[0072] In this embodiment, when it is detected that the current on any power supply branch is too large, the connection with the three-phase load device is disconnected, so that on the basis of automatically switching the phase sequence, overcurrent protection can also be achieved, improving the safety of the power supply system.

[0073] In some optional implementation manners, as Figure 5 shown, step 101 includes:

[0074] Step 1011, determine the current on each of the three power supply branches.

[0075] The current on each power supply branch can be determined by the same method as step 104 above, which will not be elaborated here.

[0076] Step 1012, based on the current on each power supply branch, determine the phase difference between each pair of power supply branches.

[0077] Specifically, relevant methods for measuring the phase difference based on three-phase current can be used to judge the phase difference between each pair of power supply branches. For example, by collecting the current waveforms on each power supply branch for a period of time, judge the phase difference between each pair of power supply branches.

[0078] Step 1013, if the phase difference between any pair of power supply branches does not conform to the preset phase difference, determine that there is a phase sequence error in the three power supply branches.

[0079] For example, use A, B, and C to represent each phase of the three-phase electricity. Under normal circumstances, the phase differences between B and A, C and B, and A and C are 120°. If it is detected that any one of the three phase differences between B and A, C and B, and A and C is not 120°, but 240°, it is determined that there is a phase sequence error.

[0080] In this embodiment, the phase difference is judged by collecting current. Using the collected current values, not only can the phase difference be detected, but also the current can be monitored in real time, which helps to enrich the functions of the power supply system, simplify the circuit structure of the power supply system, and improve the configuration efficiency of the circuit system.

[0081] Figure 6 This is a schematic structural diagram of a three - phase power supply system 600 provided by an embodiment of the present application. The system 600 specifically includes: a controller 601, a first switch module 602, a second switch module 603, and an induction device 604.

[0082] The three power supply branches of the system include a first - phase input terminal L1, a second - phase input terminal L2, a third - phase input terminal L3, a first - phase output terminal L1′, a second - phase output terminal L2′, and a third - phase output terminal L3′.

[0083] Among them, the first switch module 602 and the second switch module 603 may include devices such as relays and transistors. As Figure 6 shown, the first switch module 602 includes devices K1 and K2 that implement switch functions, and the second switch module 603 includes devices K3 and K4 that implement switch functions. The three input terminals are used to connect to three - phase electricity, and the three output terminals are used to output three - phase electricity to three - phase load devices (such as motors).

[0084] The induction device 604 is arranged on the three power supply branches of the system, and the induction signal output terminal of the induction device 604 is connected to the controller 601.

[0085] Among them, the induction device 604 may be a current sensor, a voltage sensor, etc. As an example, Figure 6 the current sensors U1, U2, and U3 in are the induction device 604. The induction device 604 can send an induction signal to the controller 601, and the controller 601 judges the phase difference between each pair of power supply branches according to the induction signal.

[0086] The control terminals of the first switch module 602 and the second switch module 603 are both connected to the controller 601. The controller 601 can control the switch logic states of the first switch module 602 and the second switch module 603 according to the judgment result of the phase difference.

[0087] The first switch module 602 is arranged 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 603 is arranged 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′.

[0088] The controller 601 is used to execute the three - phase electricity automatic phase - change method described in the above embodiments. That is, when the controller 601 judges that there is a phase - sequence error in the three power supply branches, it controls the first switch module 602 to disconnect (for example, Figure 6 K1 and K2 in are disconnected), and the second switch module 603 to conduct (for example, Figure 6When K3 and K4 in it are turned on, the connection between the first-phase input terminal and the first-phase output terminal for transmitting three-phase electricity is disconnected, the connection between the second-phase input terminal and the second-phase output terminal is disconnected, and the first-phase input terminal is connected to the second-phase output terminal, and the second-phase input terminal is connected to the first-phase output terminal. That is, the controller 601 cross-connects L1, L2, and L1′, L2′.

[0089] It should be noted that Figure 6 L1, L2, L3, and L1′, L2′, L3′ in the shown system architecture only represent the interface sequence of three-phase electricity, and do not represent the positions of the input and output ports of the actual circuit. That is, the first-phase input terminal, the second-phase input terminal, and the third-phase input terminal can also be represented by Figure 6 L2, L3, L1 in it, or represented by L3, L1, L2.

[0090] The three-phase power supply system provided by the embodiment of the present application realizes automatic adjustment of the phase sequence of each branch when the three-phase electricity wiring is incorrect by setting a controller, two switch modules, and an induction device, so that the phase sequences of the three branches conform to the three-phase electricity phase arrangement sequence, without manual adjustment of the incorrect wiring sequence, improving the automation level of three-phase electricity equipment fault handling.

[0091] In some optional implementation manners, as Figure 7 shown, the system further includes a third switch module 605. The input terminal of the third switch module 605 is connected to at least two output terminals among the first-phase output terminal, the second-phase output terminal, and the third-phase output terminal. The output terminal of the third switch module 605 is connected to the three-phase load device. The control terminal of the third switch module 605 is connected to the controller 601.

[0092] The third switch module 605 may include devices such as a relay and a transistor. As Figure 7 shown, the third switch module 605 includes a device K5 that realizes a switch function, which is arranged on the line between L1′, L2′ and the three-phase load device.

[0093] As an example, as shown in the following Figure 9 shown, the third switch module 605 includes a relay K5 and a triode T3. K5 is connected to the output terminals of two power supply lines. T3 is an NPN-type triode used to drive the relay. When any one of the three power supply branches is detected to be overcurrent, the other control signal output terminal (port 5) of the controller 601 outputs a low level to T3, and the relay K5 is disconnected.

[0094] In this embodiment, the induction device 604 is a current sensor. As the current sensors U1, U2, U3 in Figure 6 and Figure 7 can be used as the induction device 604.

[0095] The controller 601 is further configured to: determine the current on each of the three power supply branches by using a current sensor; if the current on any one 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 605 to disconnect at least two of the three power supply branches from the three-phase load device.

[0096] That is, when it is detected that the current on any power supply branch is too large, the system is disconnected from the three-phase load device, and the three-phase load device stops operating.

[0097] In this embodiment, by setting the third switch module and implementing overcurrent protection according to the collected current, the safety of the system operation is improved.

[0098] In some alternative implementation manners, as Figure 8 shown, the first switch module 602 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'; 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 end of the first control unit D1 is connected to the first switch unit K1 and the second switch unit K2, and the control end of the first control unit D1 is connected to the controller 601.

[0099] The second switch module 603 includes a third switch unit K3, a fourth switch unit K4, and a second control unit D2. The third switch unit K3 is disposed on the line between the first-phase input terminal L1 and the second-phase output terminal L2'; the fourth switch unit K4 is disposed on the line between the second-phase input terminal L2 and the first-phase output terminal L1'; the signal transmission end of the second control unit D2 is connected to the third switch unit K3 and the fourth switch unit K4, and the control end of the second control unit D2 is connected to the controller 601.

[0100] The types of the above K1, K2, K3, and K4 can be various, such as relays, thyristors, etc.

[0101] The first control unit D1 and the second control unit D2 are respectively configured to drive the switching states of the first switch module 602 and the second switch module 603. D1 and D2 can be various types of driving devices such as triodes and field effect transistors. The control ends of the first control unit D1 and the second control unit D2 can be connected to the same signal output terminal of the controller 601, or can be respectively connected to different signal output terminals. When the controller 601 determines that there is a phase sequence error according to the phase difference, it sends a control signal to the first control unit D1 and the second control unit D2 to drive K1 and K2 to disconnect and K3 and K4 to conduct.

[0102] In this embodiment, by setting four switch units and two control units, the controller controls the switch units, enabling the two power supply lines to be cross-connected. The structure of this circuit is simpler and more effective, and the cost is lower.

[0103] In some optional implementation manners, the control ends of the first control unit and the second control unit are connected to the same control signal output end of the controller 601. Under the control of the same control signal, one of the control units is turned on and the other is turned off.

[0104] That is, the same control signal sent from the same control signal output end controls the states of two different control units. As Figure 9 shown, the first control unit includes a PNP type triode T1, whose emitter is connected to a 12V power supply and whose collector is grounded; the second control unit includes an NPN type triode T2, whose emitter is grounded and whose collector is connected to a 12V power supply. If a phase sequence error is detected, the controller 601 outputs a high level through the same control signal output end ( Figure 9 the 4th port in), T1 is turned off, the relays K1 and K2 are disconnected, and at the same time T2 is turned on, the relays K3 and K4 are turned on, L1 is connected to L2′, and L2 is connected to L1′. In addition, Figure 9 the resistors R1 - R5 in are current-limiting resistors. Optionally, Figure 9 the types of the triodes T1 and T2 in can be interchanged. Correspondingly, the control signal also needs to be changed (that is, when a low level is output, T1 is turned off and T2 is turned on, and when a high level is output, T1 is turned on and T2 is turned off).

[0105] In this embodiment, by using one signal output end to control two switch modules to execute opposite switch logics simultaneously, the number of ports of the controller 601 is saved, and the implementation difficulty of the system is simplified.

[0106] Figure 10 is a schematic structural diagram of a three-phase power automatic phase-changing device provided by an embodiment of the present application. Specifically, it includes:

[0107] A first determination module 1001, configured to determine whether there is a phase sequence error in the three power supply branches of the three-phase power;

[0108] The first control module 1002 is configured to, if exists, control the first switch module to disconnect and the second switch module to conduct, so as to disconnect between the first-phase input terminal and the first-phase output terminal for transmitting three-phase electricity, disconnect between the second-phase input terminal and the second-phase output terminal, and conduct between the first-phase input terminal and the second-phase output terminal, and conduct between the second-phase input terminal and the first-phase output terminal. 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. 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.

[0109] In some alternative implementation manners, the apparatus further includes: a second control module, configured to, if there is no phase sequence error, control the first switch module to conduct and the second switch module to disconnect, so as to conduct between the first-phase input terminal and the first-phase output terminal, conduct between the second-phase input terminal and the second-phase output terminal, and disconnect between the first-phase input terminal and the second-phase output terminal, and disconnect between the second-phase input terminal and the first-phase output terminal.

[0110] In some alternative implementation manners, the first control module is further configured to: send a first control signal to the first switch module and the second switch module through the first signal output terminal, so that the first switch module disconnects and the second switch module conducts.

[0111] In some alternative implementation manners, the apparatus further includes: a second determination module, configured to determine the current on each of the three power supply branches; a third control module, configured to, if the current on any one 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.

[0112] In some alternative implementation manners, the first determination module includes: a first determination unit, configured to determine the current on each of the three power supply branches; a second determination unit, configured to determine the phase difference between each pair of power supply branches based on the current on each power supply branch; a third determination unit, configured to determine that there is a phase sequence error in the three power supply branches if the phase difference between any pair of power supply branches does not conform to a preset phase difference.

[0113] The three-phase electricity automatic phase change device provided in this embodiment may be the three-phase electricity automatic phase change device as shown in Figure 10 , and can execute all steps of the above various three-phase electricity automatic phase change methods, and further achieve the technical effects of the above various three-phase electricity automatic phase change methods. For specific reference, please refer to the above relevant descriptions. For the sake of concise description, it will not be elaborated here.

[0114] Figure 11 This is a schematic structural diagram of an electrical device provided in an embodiment of the present application.Figure 11 The electrical device 1100 shown includes the above-mentioned three-phase power supply system 600. This electrical device can use the above-mentioned three-phase power supply system 600 to supply power to the three-phase load device 1101. As an example, the three-phase load device is a three-phase motor, and this electrical device can be a device including a three-phase motor such as an air conditioner or a water pump.

[0115] By applying the above-mentioned three-phase power supply system, the electrical device provided in this embodiment can achieve the technical effects described above. For specific details, please refer to the above relevant descriptions. For the sake of concise description, it will not be elaborated here.

[0116] Figure 12 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 12 The electronic device 1200 shown includes: at least one processor 1201, a memory 1202, at least one network interface 1204, and other user interfaces 1203. Each component in the electronic device 1200 is coupled together through a bus system 1205. It can be understood that the bus system 1205 is used to realize the connection and communication between these components. In addition to including a data bus, the bus system 1205 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clear illustration, in Figure 12 all kinds of buses are labeled as the bus system 1205.

[0117] Among them, the user interface 1203 may include a display, a keyboard, or a pointing device (such as a mouse, a trackball, a touchpad, or a touch screen, etc.).

[0118] It can be understood that the memory 1202 in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synch link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM). The memory 1202 described herein is intended to include but not be limited to these and any other suitable types of memory.

[0119] In some embodiments, the memory 1202 stores the following elements, executable units or data structures, or subsets or supersets thereof: an operating system 12021 and application programs 12022.

[0120] Among them, the operating system 12021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., and is used to implement various basic services and process hardware-based tasks. The application programs 12022 include various application programs, such as a media player and a browser, etc., and are used to implement various application services. The program for implementing the method of the embodiments of the present application can be included in the application programs 12022.

[0121] In this embodiment, by calling the programs or instructions stored in the memory 1202, specifically, the programs or instructions stored in the application programs 12022, the processor 1201 is configured to execute the method steps provided in each method embodiment, for example, including:

[0122] Obtain the phase induction signals of each power supply branch from the three power supply branches of the three-phase power supply; based on the phase induction signals, determine the phase differences between each pair of the three power supply branches; based on the phase differences, determine whether there is a phase sequence error in the three power supply branches; if so, control the first switch module to disconnect and the second switch module to conduct, so that the connection between the first-phase input terminal and the first-phase output terminal for transmitting the three-phase power is disconnected, the connection between the second-phase input terminal and the second-phase output terminal is disconnected, and, the connection between the first-phase input terminal and the second-phase output terminal is conducted, and the connection between the second-phase input terminal and the first-phase output terminal is conducted.

[0123] The method disclosed in the embodiments of the present application can be applied to or implemented by the processor 1201. The processor 1201 may be an integrated circuit chip with signal processing capabilities. During implementation, the steps of the above method can be completed by the integrated logic circuit in hardware or instructions in software form in the processor 1201. The above-mentioned processor 1201 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor or executed by a combination of hardware and software units in the decoding processor. The software unit may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 1202, and the processor 1201 reads the information in the memory 1202 and combines its hardware to complete the steps of the above method.

[0124] It will be appreciated that the embodiments described herein may be implemented using hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the processing unit may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the above functions of this application, or any combination thereof.

[0125] For a software implementation, the above-described techniques herein may be implemented by units that execute the above functions herein. The software code may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

[0126] The electronic device provided in this embodiment may be an electronic device as shown in Figure 12 and can execute all steps of the above-described three-phase power automatic phase change methods, thereby achieving the technical effects of the above-described three-phase power automatic phase change methods. For specific details, please refer to the above relevant descriptions. For the sake of brevity, no further elaboration will be provided here.

[0127] The embodiments of this application also provide a storage medium (computer-readable storage medium). The storage medium stores one or more programs. Among them, the storage medium may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; the memory may also include a combination of the above types of memory.

[0128] When one or more programs in the storage medium can be executed by one or more processors, the three-phase power automatic phase change method executed on the electronic device side as described above can be implemented.

[0129] The above processor is used to execute the program stored in the memory to implement the following steps of the three-phase power automatic phase change method executed on the electronic device side:

[0130] Obtain the phase induction signals of each power supply branch from the three power supply branches of the three-phase power supply respectively; based on the phase induction signals, determine the phase differences between each pair of power supply branches among the three power supply branches; based on the phase differences, determine whether there is a phase sequence error in the three power supply branches; if so, control the first switch module to disconnect and the second switch module to conduct, so that the connection between the first-phase input end and the first-phase output end for transmitting the three-phase power is disconnected, the connection between the second-phase input end and the second-phase output end is disconnected, and in addition, the connection between the first-phase input end and the second-phase output end is conducted, and the connection between the second-phase input end and the first-phase output end is conducted.

[0131] Those skilled in the art should also be able to further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner 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 to exceed the scope of this application.

[0132] The steps of the circuits or algorithms described in combination with the embodiments disclosed herein can be implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0133] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless otherwise clearly specified in the context, the singular forms "a", "an", and "the" as used herein may also represent the plural form. The terms "include", "comprise", "contain", and "have" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations. The steps, processes, and operations described herein are not to be construed as necessarily requiring them to be executed in the specific order described or illustrated, unless the execution order is clearly specified. It should also be understood that additional or alternative steps can be used.

[0134] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A three-phase electric automatic commutation method, characterized in that: The method comprises: Determine whether there is a phase sequence error in the three power supply branches of the three-phase electricity; If present, control the first switch module to be disconnected and the second switch module to be turned on, so that the first phase input terminal and the first phase output terminal for transmitting the three-phase electricity are disconnected, the second phase input terminal and the second phase output terminal are disconnected, and the first phase input terminal and the second phase output terminal are turned on, and the second phase input terminal and the first phase output terminal are turned on, wherein the first switch module is arranged 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 arranged 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 method according to claim 1, characterized in that: After determining whether the three power supply branches of the three-phase electricity have a phase sequence error, the method further includes: If there is no phase sequence error, control the first switch module to be turned on and the second switch module to be turned off, so that the first phase input terminal and the first phase output terminal are connected, the second phase input terminal and the second phase output terminal are connected, and the first phase input terminal and the second phase output terminal are disconnected, and the second phase input terminal and the first phase output terminal are disconnected.

3. The method according to claim 1, characterized in that The controlling the first switch module to be disconnected and the second switch module to be turned on includes: A first control signal is sent to the first switch module and the second switch module through the first signal output terminal, so that the first switch module is disconnected and the second switch module is turned on.

4. The method according to claim 1, characterized in that: The method further comprises: Determining the current on each of the three power supply branches; If the current on any one of the three power supply branches is greater than or equal to a preset current threshold, a second control signal is sent to the third switch module to disconnect at least two of the three power supply branches from the three-phase load device.

5. The method according to claim 1, characterized in that: The determining whether the three power supply branches of the three-phase electricity have a phase sequence error comprises: Determining the current on each of the three power supply branches; Determine the phase difference between each pair of power supply branches based on the current on each power supply branch; If the phase difference between any pair of power supply branches does not meet the preset phase difference, it is determined that there is a phase sequence error in the three power supply branches.

6. A three-phase power supply system, characterized in that: The system comprises: a controller, a first switch module, a second switch module and an induction device; the three power supply branches of the system comprise 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 arranged on the three power supply branches of the system, and the sensing signal output end of the sensing device is connected to the controller; The control ends of the first switch module and the second switch module are connected to 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; The controller is used to receive the sensing signal collected by the sensing device, and based on the sensing signal, execute the three-phase electric automatic commutation method according to any one of claims 1 to 5.

7. The system according to claim 6, characterized in that The system further comprises a third switch module, wherein an input end of the third switch module is connected to at least two output ends of the first phase output end, the second phase output end, and the third phase output end, and an output end of the third switch module is connected to a three-phase load device; The control end of the third switch module is connected to the controller; The sensing device is a current sensor, and the controller is also used to: use the current sensor to determine the current on each of the three power supply branches; if the current on 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.

8. The system according to claim 6, 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 arranged on the line between the first phase input terminal and the first phase output terminal, and the second switch unit is arranged on the line between the second phase input terminal and the second phase output terminal; The signal transmission end of the first control unit is connected to the first switch unit and the second switch unit, and the control end 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 arranged on the line between the first phase input terminal and the second phase output terminal, and the fourth switch unit is arranged on the line between the second phase input terminal and the first phase output terminal; A signal transmission end of the second control unit is connected to the third switch unit and the fourth switch unit, and a control end of the second control unit is connected to the controller.

9. The system according to claim 8, characterized in that The control end of the first control unit and the control end of the second control unit are connected to the same control signal output end of the controller; The first control unit and the second control unit are controlled by the same control signal, wherein one of the control units is turned on and the other is turned off.

10. An electrical device, characterized in that: A three-phase power supply system comprising any one of claims 6-9.

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