Dual-motor driving circuit and troubleshooting method of dual-motor driving circuit

Abstract

The embodiment of the invention relates to a dual-motor driving circuit and a fault removal method of the dual-motor driving circuit. The circuit comprises five bridge arms, two direct-current bus capacitors and a common selection unit, each of the five bridge arms is provided with two switch units; the five bridge arms comprise a common bridge arm and four special bridge arms, connecting ends of two switch units of the common bridge arm are connected with a first contact of a common selection unit, and a common connecting end of two direct-current bus capacitors is connected with a second contact of the common selection unit; the output end of the common selection unit is connected with the common phase of the first motor and the second motor. According to the embodiment of the invention, the fault of the driving circuit can be timely handled, the motor driving stability is improved, the motor driving circuit can be flexibly switched between the two bridge arm topologies, the use flexibility of the motor driving circuit is improved, and the use scene is expanded.

Description

Technical Field

[0001] The present application relates to the field of motor control technology, and in particular to a dual-motor drive circuit and a method for troubleshooting the dual-motor drive circuit. Background Art

[0002] With the continuous advancement of modern industrial technology, multi-motor drive control technology has been widely applied in various fields, such as CNC machine tools, electric vehicles, and industrial robots. In CNC machine tools, multi-motor drive technology is used to precisely control the motion of multiple axes, significantly improving machining accuracy and efficiency. In electric vehicles, multi-motor drive technology is used to enhance vehicle power output and handling performance while optimizing energy utilization. Multi-motor coordinated control enables industrial robots to perform complex movements, improving production efficiency and flexibility. Control theory is the core of control system design, ensuring that multiple motors operate in coordination and synchronization. Current dual permanent magnet synchronous motor control typically uses four-arm or five-arm bridge topologies.

[0003] Compared with the five-arm topology, the four-arm topology saves one bridge arm, that is, two switching tubes, and reduces the cost. However, when the switching tube in the bridge arm is short-circuited or open-circuited, one of the motors cannot run, resulting in energy waste and increased operating costs.

[0004] The five-arm topology has a complex control algorithm and higher control accuracy, and has a greater advantage in bus voltage utilization compared to the four-arm topology. However, two motors in the five-arm topology share one arm, which has a higher utilization rate and more losses, which has a greater impact on the stability and reliability of the system. Summary of the Invention

[0005] In view of this, in order to solve some or all of the above technical problems, the embodiments of the present application provide a dual-motor drive circuit and a troubleshooting method for the dual-motor drive circuit.

[0006] In a first aspect, an embodiment of the present application provides a dual-motor drive circuit, which includes: five bridge arms, two DC bus capacitors and a common selection unit; two switch units are provided on each of the five bridge arms; the five bridge arms include a common bridge arm and four dedicated bridge arms, the connection ends of the two switch units of the common bridge arm are connected to the first contact of the common selection unit, the common connection ends of the two DC bus capacitors are connected to the second contact of the common selection unit, and the output end of the common selection unit is connected to the common phase of the first motor and the second motor.

[0007] In one possible embodiment, the circuit also includes four dedicated selection units; for each of the four dedicated bridge arms, the connection ends of the two switching units of the dedicated bridge arm are connected to the first contact of the corresponding dedicated selection unit, the second contact of the corresponding dedicated selection unit is connected to the common bridge arm, and the output end of the corresponding dedicated selection unit is connected to one of the corresponding motors.

[0008] In one possible embodiment, the circuit also includes a controller and five current detection units, each of the five current detection units is connected to a bridge arm, and is used to detect the current on the connected bridge arm; the controller is connected to each of the five current detection units, and is used to receive current detection signals output by the five current detection units, and switch the states of the common selection unit and the four dedicated selection units according to the current detection signals.

[0009] In one possible embodiment, the circuit further includes a first switch unit and a second switch unit; the first switch unit is arranged on the line between the output end of the common selection unit and the first motor; the second switch unit is arranged on the line between the output end of the common selection unit and the second motor.

[0010] In one possible implementation, the common selection unit is a dual-circuit selection circuit breaker.

[0011] In a second aspect, an embodiment of the present application provides a troubleshooting method for a dual-motor drive circuit, the method comprising: determining a faulty bridge arm from the five bridge arms included in the dual-motor drive circuit; if the faulty bridge arm is a common bridge arm, controlling the output end of the common selection unit included in the dual-motor drive circuit to be connected to the second contact, so that the common phase of the first motor and the second motor is connected to the common connection end of the two DC bus capacitors included in the dual-motor drive circuit.

[0012] In one possible embodiment, after determining the faulty bridge arm from the five bridge arms included in the dual-motor drive circuit, the method further includes: if the faulty bridge arm is a dedicated bridge arm, controlling the output end of the common selection unit to be connected to the second contact, and controlling the output end of the dedicated selection unit corresponding to the faulty bridge arm to be connected to the second contact, so that the common bridge arm replaces the faulty bridge arm.

[0013] In one possible implementation, after determining a faulty bridge arm from among the five bridge arms included in the dual-motor drive circuit, the method further includes: if the number of faulty bridge arms is greater than or equal to two, determining the location of the faulty bridge arm; and determining a target switch unit to be currently disconnected from among the first switch unit and the second switch unit included in the dual-motor drive circuit according to a preset bridge arm switching rule; The control target switching unit is disconnected.

[0014] In a third aspect, embodiments of the present application provide an electrical device comprising: a rectifier module, a first motor, a second motor, and the dual-motor drive circuit of the first aspect. The rectifier module is connected to a voltage input terminal of the dual-motor drive circuit, an output terminal of a common selection unit of the dual-motor drive circuit is connected to a common phase of the first motor and the second motor, and the remaining phases of the first motor and the second motor are respectively connected to the output terminals of corresponding dedicated selection units.

[0015] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method of any embodiment of the troubleshooting method for the dual-motor drive circuit of the second aspect described above is implemented.

[0016] The dual-motor drive circuit and the troubleshooting method for the dual-motor drive circuit provided by the embodiment of the present application are provided with five bridge arms, two DC bus capacitors and a common selection unit in the circuit, the five bridge arms include a common bridge arm and four dedicated bridge arms, the connection ends of the two switch units of the common bridge arm are connected to the first contact of the common selection unit, the common connection end of the two DC bus capacitors is connected to the second contact of the common selection unit, and the output end of the common selection unit is connected to the common phase of the first motor and the second motor. The embodiment of the present application realizes that when a common bridge arm in the circuit fails, the common selection unit can be used to switch the common phase of the two motors from the common bridge arm to the DC bus capacitor, that is, from a five-bridge arm topology to a four-bridge arm topology, thereby realizing timely response to the failure of the drive circuit and improving the stability of the motor drive. In addition, the motor drive circuit can flexibly switch between the two bridge arm topologies, thereby improving the flexibility of use of the motor drive circuit and expanding the use scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A schematic structural diagram of a dual-motor drive circuit provided in an embodiment of the present application; Figure 2 A schematic diagram of the circuit structure after the public selection unit is switched according to an embodiment of the present application; Figure 3 A schematic structural diagram of a second dual-motor drive circuit provided in an embodiment of the present application; Figure 4 A schematic diagram of the circuit structure after the dedicated selection unit provided in an embodiment of the present application is switched; Figure 5 A schematic structural diagram of a third dual-motor drive circuit provided in an embodiment of the present application; Figure 6 A schematic structural diagram of a fourth dual-motor drive circuit provided in an embodiment of the present application; Figure 7 A flowchart of a method for troubleshooting a dual-motor drive circuit provided in an embodiment of the present application; Figure 8 A flowchart of another method for troubleshooting a dual-motor drive circuit provided in an embodiment of the present application; Figure 9 A flowchart of another method for troubleshooting a dual-motor drive circuit provided in an embodiment of the present application; Figure 10 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It is apparent that the described embodiments are only a portion of the embodiments of the present application, rather than all of the embodiments. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values ​​described in these embodiments do not limit the scope of the present application.

[0022] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present application are only used to distinguish between different steps, devices, modules and other objects, and neither represent any specific technical meaning nor indicate the logical order between them.

[0023] It should also be understood that in this embodiment, “a plurality of” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0024] It should also be understood that any component, data or structure mentioned in the embodiments of the present application can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0025] In addition, the term "and / or" in this application is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0026] It should also be understood that the description of each embodiment in this application focuses on the differences between the embodiments, and the same or similar aspects can be referenced with each other. For the sake of brevity, they will not be described one by one.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0028] 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-mentioned technologies, circuits, and devices should be considered part of the specification.

[0029] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0030] It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of 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 in combination with the embodiments. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] Figure 1 This is a schematic diagram of the structure of a dual-motor drive circuit 100 provided in an embodiment of the present application. This circuit can be applied to various scenarios requiring motor drive, such as household appliances, CNC machine tools, and electric vehicles. The circuit specifically includes five bridge arms, two DC bus capacitors, and a common selection unit. Each of the five bridge arms is equipped with two switch units.

[0032] like Figure 1 As shown, S1-S10 are switching units, each consisting of a diode and a switching transistor (typically an IGBT). S1 and S2 are connected to form a bridge arm; S3 and S4 are connected to form a bridge arm; S5 and S6 are connected to form a bridge arm; S7 and S8 are connected to form a bridge arm; and S9 and S10 are connected to form a bridge arm. QF_D1 is a common selection unit.

[0033] The five bridge arms include a common bridge arm and four dedicated bridge arms. The connection ends of the two switch units of the common bridge arm are connected to the first contact of the common selection unit, the common connection ends of the two DC bus capacitors are connected to the second contact of the common selection unit, and the output end of the common selection unit is connected to the common phase of the first motor and the second motor.

[0034] like Figure 1 As shown, the bridge arm formed by S9 and S10 is a common bridge arm. The common selection unit includes two contacts and an output terminal. As shown in Figure 1, the contact marked as "1" is the first contact, and the contact marked as "2" is the second contact.

[0035] The common phases of the first motor M1 and the second motor M2 are connected to the output of a common selection unit. The output of the common selection unit can be connected to either the first or second contact. When the output is connected to the first contact, the common bridge arm formed by S9 and S10 is simultaneously connected to the common phases (c1 and c2) of motors M1 and M2. The dedicated bridge arms formed by S1, S2, and S3, S4 are connected to phases a1 and b1 of motor M1, respectively. The dedicated bridge arms formed by S5, S6, and S7, S8 are connected to phases a2 and b2 of motor M2. The circuit uses a half-cycle SVPWM (Space Vector Pulse Width Modulation) drive algorithm to start the motors.

[0036] When the output terminal is connected to the second contact, the common bridge arm formed by S9 and S10 is disconnected from the motors M1 and M2, and the common phases c1 and c2 of the motors M1 and M2 are connected to the DC bus capacitors C1 and C2. The topology of the circuit is as follows: Figure 2 The entire circuit is changed to a four-arm topology, and the algorithm used in the circuit is switched to a three-phase four-switch SVPWM modulation drive algorithm to drive the motor to start.

[0037] Typically, when the common bridge arm is intact, the output of the common selection unit is connected to the first contact, driving the dual motors using a five-bridge-arm topology. If a short circuit or open circuit occurs in the common bridge arm, the common selection unit is switched to the second contact, driving the dual motors using a four-bridge-arm topology.

[0038] The dual-motor drive circuit provided by the embodiment of the present application has five bridge arms, two DC bus capacitors and a common selection unit set in the circuit. The five bridge arms include a common bridge arm and four dedicated bridge arms. The connection ends of the two switch units of the common bridge arm are connected to the first contact of the common selection unit, the common connection end of the two DC bus capacitors is connected to the second contact of the common selection unit, and the output end of the common selection unit is connected to the common phase of the first motor and the second motor. The embodiment of the present application realizes that when a common bridge arm in the circuit fails, the common selection unit can be used to switch the common phase of the two motors from the common bridge arm to the DC bus capacitor, that is, from a five-bridge arm topology to a four-bridge arm topology, thereby realizing timely response to the failure of the drive circuit and improving the stability of the motor drive. In addition, the motor drive circuit can flexibly switch between the two bridge arm topologies, thereby improving the flexibility of the motor drive circuit and expanding the usage scenarios.

[0039] In some optional implementations of this embodiment, such as Figure 3 As shown, the circuit also includes four dedicated selection units QF_D2, QF_D3, QF_D4, and QF_D5; For each of the four dedicated bridge arms, the connection ends of the two switching units of the dedicated bridge arm are connected to the first contact of the corresponding dedicated selection unit, the second contact of the corresponding dedicated selection unit is connected to the common bridge arm, and the output end of the corresponding dedicated selection unit is connected to one of the phases of the corresponding motor.

[0040] Typically, in the event of a fault in any bridge arm, each dedicated selection unit is connected to the first contact, forming a five-arm topology. If a dedicated bridge arm fails, the corresponding dedicated selection unit disconnects the faulty bridge arm from the motor. The dedicated selection unit switches to the second contact, replacing the faulty bridge arm with the common bridge arm. Simultaneously, switching the common selection unit to the second contact switches the common phase of the two motors to the two DC bus capacitors.

[0041] Taking the bridge arm formed by S1 and S2 as an example, when no fault occurs, the bridge arm is connected to the first contact of the dedicated selection unit QF_D2, the second contact of QF_D2 is connected to the common bridge arm formed by connections S9 and S10, and the output end of QF_D2 is connected to the a1 phase of the first motor M1. When a short circuit or open circuit fault occurs in the bridge arm, the output end of QF_D2 is switched to connect to the second contact, and at the same time, the output end of QF_D1 is switched to connect to the second contact, so that the common phase of motors M1 and M2 is connected to capacitors C1 and C2, and the a1 phase of motor M1 is connected to the common bridge arm. The entire circuit operates according to the four-bridge arm topology. The topology of the circuit is as follows Figure 4 shown.

[0042] This embodiment sets a corresponding dedicated selection unit for each dedicated bridge arm, so that when a dedicated bridge arm fails, the dedicated bridge arm can be used to replace the faulty bridge arm, thereby achieving timely response to the fault and improving the stability of motor operation.

[0043] In some optional implementations of this embodiment, such as Figure 5 As shown, the circuit further includes a controller 301 and five current detection units 302 - 306 . Each of the five current detection units is connected to a bridge arm and is used to detect the current I on the connected bridge arm.

[0044] The controller is connected to each of the five current detection units, and is used for receiving current detection signals output by the five current detection units, and switching the states of the common selection unit and the four dedicated selection units according to the current detection signals.

[0045] The controller 301 can control each selection unit so that the output end of each selection unit is connected to the first contact point or the second contact point.

[0046] like Figure 5 As shown, when the controller detects that the current on the common bridge arm exceeds the upper current threshold or is less than the lower current threshold, it can control QF_D1 to switch to the second contact, so that the common phase of motors M1 and M2 is connected to capacitors C1 and C2; when the controller detects that the current on a certain dedicated bridge arm exceeds the upper current threshold or is less than the lower current threshold, it can control the corresponding dedicated selection unit to switch to the second contact, and at the same time control QF_D1 to switch to the second contact, so that the common phase of motors M1 and M2 is connected to capacitors C1 and C2, and the common bridge arm is used to replace the faulty bridge arm.

[0047] This embodiment provides a controller and a current detection unit, so that the controller monitors the current on each bridge arm and controls the selection unit corresponding to each bridge arm, so that the controller can more flexibly switch the state of each switch unit, improve the convenience of circuit control, and improve the degree of automation of circuit operation.

[0048] In some optional implementations of this embodiment, such as Figure 6 As shown, the circuit further includes a first switching unit QF1 and a second switching unit QF2.

[0049] The first switch unit QF1 is provided on the line between the output terminal of the common selection unit and the first motor M1 (ie, provided on phase c1). The second switch unit QF2 is provided on the line between the output terminal of the common selection unit and the second motor M2 (ie, provided on phase c2).

[0050] The first switch unit QF1 and the second switch unit QF2 can be circuit breakers or controlled switches connected to the controller. Generally, if at least two bridge arms have faults, or if only one motor needs to be controlled, the first switch unit QF1 and the second switch unit QF2 can be disconnected, and the circuit of this embodiment drives the single motor.

[0051] This embodiment can control the access status of any motor by providing the first switch unit and the second switch unit, thereby enriching the fault handling methods and improving the scenario adaptability of the circuit.

[0052] In some optional implementations of this embodiment, the common selection unit is a dual-circuit selection circuit breaker that can automatically sense the current output by the bridge arm and automatically switch contacts if the current is too large or too small.

[0053] Optional, Figure 3 The four dedicated selection units can also use dual-circuit selection circuit breakers.

[0054] This embodiment adopts a dual-circuit selective circuit breaker as the selection unit, so that the selection unit can automatically sense the current size without the need for an external controller, thereby reducing the structural complexity of the circuit.

[0055] Figure 7 A flow chart of a troubleshooting method for a dual-motor drive circuit provided in an embodiment of the present application. This method can be used to control the dual-motor drive circuit in the above-mentioned embodiment. This method can be executed by a dedicated controller, or by other general electronic devices connected to the dual-motor drive circuit, such as an industrial computer, a laptop computer, a smart phone, etc. This method can also be executed by the above-mentioned dual-motor drive circuit itself, that is, the circuit itself can detect the fault condition of each bridge arm and switch the state of each selection unit. In addition, the execution subject of this method can be hardware or software. When the above-mentioned execution subject is hardware, the execution subject can be one or more of the above-mentioned electronic devices. For example, a single electronic device can execute this method, or a plurality of electronic devices can cooperate with each other to execute this method. When the above-mentioned execution subject is software, this method can be implemented as multiple software or software modules, or as a single software or software module. No specific limitation is made here.

[0056] like Figure 7 As shown, the method specifically includes: Step 701: Determine a bridge arm having a fault from among five bridge arms included in the dual-motor drive circuit.

[0057] In some embodiments, it is possible to determine whether a fault has occurred based on the magnitude of the current on each bridge arm. Figure 5The current detection unit shown collects the current of each bridge arm, and the controller determines whether the current is within the normal range. It can also be achieved through a dual-way selection circuit breaker (such as the above Figure 1 、 Figure 2 QF_D1-QF_D5 shown in the figure) automatically senses whether the current on each bridge arm exceeds the current upper limit.

[0058] Step 702: If the bridge arm in which the fault occurs is the common bridge arm, control the output end of the common selection unit included in the dual-motor drive circuit to be connected to the second contact, so that the common phase of the first motor and the second motor is connected to the common connection end of the two DC bus capacitors included in the dual-motor drive circuit.

[0059] In some embodiments, if the bridge arm that fails is a common bridge arm, the bridge arm can be switched as follows: Figure 1 The state of the common selection unit shown in the figure, the dual motor drive circuit follows the above Figure 2 The topology shown operates.

[0060] The dual-motor drive circuit troubleshooting method provided in the embodiment of the present application detects the fault status of each bridge arm in the dual-motor drive circuit in real time, and switches to a four-bridge-arm topology when a common bridge arm fails, thereby achieving timely response to the drive circuit fault and improving the stability of the motor drive. In addition, the motor drive circuit can flexibly switch between the two bridge arm topologies, thereby improving the flexibility of the motor drive circuit and expanding the usage scenarios.

[0061] In some optional implementations, such as Figure 8 As shown, after step 701, the method further includes: Step 703: If the faulty bridge arm is a dedicated bridge arm, control the output end of the public selection unit to be connected to the second contact, and control the output end of the dedicated selection unit corresponding to the faulty bridge arm to be connected to the second contact, so that the public bridge arm replaces the faulty bridge arm.

[0062] This embodiment is applicable to the above Figure 3 Corresponding circuit structure. If the faulty bridge arm is a dedicated bridge arm, the state of the dedicated selection unit corresponding to the dedicated bridge arm can be switched, as well as the state of the common selection unit. The dedicated selection unit is switched to the second contact point, replacing the faulty bridge arm with the common bridge arm. Simultaneously, the common selection unit is switched to the second contact point, switching the common phase of the two motors to connect to the two DC bus capacitors.

[0063] like Figure 3As shown, taking the bridge arm composed of S1 and S2 as an example, when no fault occurs, the bridge arm is connected to the first contact of the dedicated selection unit QF_D2, the second contact of QF_D2 is connected to the common bridge arm composed of connections S9 and S10, and the output end of QF_D2 is connected to the a1 phase of the first motor M1. When a short circuit or open circuit fault occurs in the bridge arm, the output end of QF_D2 is switched to connect to the second contact, and at the same time, the output end of QF_D1 is switched to connect to the second contact, so that the common phase of motors M1 and M2 is connected to capacitors C1 and C2, and the a1 phase of motor M1 is connected to the common bridge arm. The entire circuit operates according to the four-bridge arm topology. The topology of the circuit is shown as follows Figure 4 shown.

[0064] In this embodiment, when a dedicated bridge arm fails, the dedicated bridge arm can be used to replace the failed bridge arm, thereby achieving timely response to the failure and improving the stability of the motor operation.

[0065] In some optional implementations, such as Figure 9 As shown, after step 701, the method further includes: Step 704: If the number of bridge arms with faults is greater than or equal to two, determine the locations of the bridge arms with faults.

[0066] Specifically, by monitoring the fault status of each bridge arm, it is possible to determine which bridge arm has failed.

[0067] Step 705 : According to a preset bridge arm switching rule, a target switch unit to be disconnected is determined from the first switch unit and the second switch unit included in the dual-motor drive circuit.

[0068] Specifically, when only one of the five bridge arms fails, the bridge arms can be switched according to the above embodiment. If the number of failed bridge arms is greater than or equal to two, it is necessary to select one of the motors to stop running according to the bridge arm switching rules, and use the bridge arm without fault to drive the other motor. Figure 6 , the target switching unit is QF1 or QF2.

[0069] Step 706: Control the target switch unit to be disconnected.

[0070] For example, referring to the above Figure 6 If a fault occurs in the common bridge arm and one of the dedicated bridge arms (for example, the bridge arm composed of S1 and S2), the common bridge arm is disconnected from phases C1 and C2, and phases C1 and C2 are connected to capacitors C1 and C2. At the same time, the motor (for example, M1) corresponding to the failed dedicated bridge arm is disconnected, that is, the switch unit (for example, QF1) corresponding to the motor is controlled to be disconnected.

[0071] For another example, if a common bridge arm and two dedicated bridge arms (e.g., S1, S2, and S3, S4) fail, and the two failed dedicated bridge arms correspond to the same motor (e.g., M1), the common bridge arm is disconnected from phases C1 and C2, and phases C1 and C2 are connected to capacitors C1 and C2. Simultaneously, the motor corresponding to the failed dedicated bridge arm is disconnected, meaning the switch unit (e.g., QF1) corresponding to the motor is controlled to be disconnected.

[0072] For another example, if three dedicated bridge arms fail, the motors connected to the two faulty bridge arms can be disconnected by controlling QF1 or QF2, and the common bridge arm can be disconnected from phases C1 and C2, and phases C1 and C2 can be connected to capacitors C1 and C2. At the same time, the dedicated selection unit can be controlled to replace the other faulty bridge arm with the common bridge arm.

[0073] For example, if a common bridge arm and two or more dedicated bridge arms fail, or if three or more dedicated bridge arms fail, both motors will be unable to drive. In this case, both the first and second switch units can be used as target switch units to disconnect the two motors. A fault prompt message can also be output to prompt the user to manually resolve the fault.

[0074] In this embodiment, when the number of faulty bridge arms is greater than or equal to two, the access status of the motor is controlled according to the position of the faulty bridge arm, thereby being able to cope with more complex fault conditions and improving the scenario adaptability of the motor drive.

[0075] Figure 10 This is a structural schematic diagram of an electrical device 1000 provided in an embodiment of the present application. The electrical device 1000 includes: a rectifier module (including an AC power supply, rectifier diodes D1-D4), a first motor M1, a second motor M2, and the dual-motor drive circuit 100 described in any of the above embodiments.

[0076] like Figure 10 As shown, the rectifier module is connected to the voltage input end of the dual-motor drive circuit, and the output end of the common selection unit of the dual-motor drive circuit is connected to the common phase of the first motor and the second motor.

[0077] The electrical equipment provided in this embodiment can be various equipment including motors, such as air conditioners, electric vehicles, robots, etc.

[0078] The electrical equipment provided in the embodiment of the present application realizes timely response to faults and improves the stability of motor drive by applying the above-mentioned dual-motor drive circuit.

[0079] The present application also provides a storage medium (computer-readable storage medium). The storage medium stores one or more programs. 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, a hard disk, or a solid-state drive; or a combination of the aforementioned types of memory.

[0080] When one or more programs in the storage medium can be executed by one or more processors, the above-mentioned troubleshooting method for the dual-motor drive circuit executed on the electronic device side can be implemented.

[0081] The processor is configured to execute a program stored in the memory to implement the following steps of a method for troubleshooting a dual-motor drive circuit executed on the electronic device side: From the five bridge arms included in the dual-motor drive circuit, determine the bridge arm where the fault occurs; if the bridge arm where the fault occurs is the common bridge arm, control the output end of the common selection unit included in the dual-motor drive circuit to be connected to the second contact, so that the common phase of the first motor and the second motor is connected to the common connection end of the two DC bus capacitors included in the dual-motor drive circuit.

[0082] Professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians 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.

[0083] The steps of the circuits or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0084] 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 the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0085] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present 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 the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A dual motor drive circuit, characterized in that: The circuit comprises: five bridge arms, two DC bus capacitors and a common selection unit; each of the five bridge arms is provided with two switch units; The five bridge arms include a common bridge arm and four dedicated bridge arms. The connection ends of the two switch units of the common bridge arm are connected to the first contact of the common selection unit, the common connection end of the two DC bus capacitors is connected to the second contact of the common selection unit, and the output end of the common selection unit is connected to the common phase of the first motor and the second motor.

2. The circuit according to claim 1, wherein: The circuit also includes four dedicated selection units; For each of the four dedicated bridge arms, the connection ends of the two switching units of the dedicated bridge arm are connected to the first contact of the corresponding dedicated selection unit, the second contact of the corresponding dedicated selection unit is connected to the common bridge arm, and the output end of the corresponding dedicated selection unit is connected to one of the corresponding motors.

3. The circuit according to claim 2, characterized in that The circuit further includes a controller and five current detection units, each of the five current detection units being connected to a bridge arm and configured to detect the current on the connected bridge arm; The controller is connected to each of the five current detection units, and is configured to receive current detection signals output by the five current detection units, and switch states of the common selection unit and the four dedicated selection units according to the current detection signals.

4. The circuit according to claim 1, wherein: The circuit further includes a first switch unit and a second switch unit; The first switch unit is provided on a line between the output terminal of the common selection unit and the first motor; The second switch unit is provided on a line between an output terminal of the common selection unit and the second motor.

5. The circuit according to claim 1, wherein: The common selection unit is a dual-circuit selection circuit breaker.

6. A method for troubleshooting a dual-motor drive circuit, characterized in that: The dual-motor drive circuit is the dual-motor drive circuit according to any one of claims 1 to 5; the method comprises: Determine the bridge arm that has a fault from the five bridge arms included in the dual-motor drive circuit; If the faulty bridge arm is a common bridge arm, the output end of the common selection unit included in the dual-motor drive circuit is controlled to be connected to the second contact, so that the common phase of the first motor and the second motor is connected to the common connection end of the two DC bus capacitors included in the dual-motor drive circuit.

7. The method according to claim 6, characterized in that After determining a bridge arm having a fault among the five bridge arms included in the dual-motor drive circuit, the method further includes: If the faulty bridge arm is a dedicated bridge arm, the output end of the common selection unit is controlled to be connected to the second contact, and the output end of the dedicated selection unit corresponding to the faulty bridge arm is controlled to be connected to the second contact, so that the common bridge arm replaces the faulty bridge arm.

8. The method according to claim 6, characterized in that After determining a bridge arm having a fault among the five bridge arms included in the dual-motor drive circuit, the method further includes: If the number of the bridge arms having the fault is greater than or equal to two, determining the position of the bridge arms having the fault; According to a preset bridge arm switching rule, determining a target switch unit to be disconnected from the first switch unit and the second switch unit included in the dual-motor drive circuit; The target switch unit is controlled to be disconnected.

9. An electrical device, characterized in that: The electrical device comprises: a rectifier module, a first motor, a second motor, and a dual-motor drive circuit according to any one of claims 1 to 5; The rectifier module is connected to the voltage input end of the dual-motor drive circuit, the output end of the common selection unit of the dual-motor drive circuit is connected to the common phase of the first motor and the second motor, and the remaining phases of the first motor and the second motor are respectively connected to the output ends of the corresponding dedicated selection units.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the troubleshooting method for the dual-motor drive circuit according to any one of claims 6 to 8 is implemented.

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