Drive control circuit, drive control method, circuit board and air conditioner

Abstract

The present invention discloses a drive control circuit, a drive control method, a circuit board and an air conditioner. The drive control circuit includes a first switch module, a first power module, a second power module, a second switch module and an energy storage device. By configuring the first switch module to connect the power input end to the first power module or short-circuit the first DC end of the first power module, and configuring the second switch module to connect the energy storage device to the second power module or short-circuit the second DC end of the second power module, the drive control circuit has multiple working states to be suitable for different scenarios. In addition, by configuring the control module to output control signals to the first power module and the second power module according to the states of the first switch module and the second switch module, the drive control circuit can operate reliably and efficiently under various working states.

Description

Technical Field

[0001] The present invention relates to the field of motor drive technology, and in particular to a drive control circuit, a drive control method, a circuit board and an air conditioner. Background Art

[0002] An open-winding motor system is a novel dual-ended power supply topology created by opening the neutral point of a conventional motor winding and connecting a converter in series at each end. This system offers excellent characteristics, including high output power, diverse power supply modes and voltage vector modulation, flexible control, and strong redundancy and fault tolerance. It has broad application in high-power, high-capacity, and wide-operating-range applications.

[0003] Air conditioner compressors account for over 70% of total energy consumption. Therefore, improving compressor efficiency significantly improves the overall energy efficiency of the air conditioning system. Currently, open-winding motor systems are increasingly used in air conditioners, but they also face certain challenges. These include the diverse and complex operating conditions of air conditioners, the varying control requirements for each operating condition, and the need to balance energy efficiency and operational reliability. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a drive control circuit, a drive control method, a circuit board and an air conditioner, which have multiple working states and can operate reliably and efficiently in various working states.

[0005] In a first aspect, an embodiment of the present invention provides a drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of the winding of each phase constitutes a first three-phase outgoing wire group, and the other end of the winding of each phase constitutes a second three-phase outgoing wire group, including:

[0006] a first power module, the first power module comprising a first DC terminal and a first AC terminal, the first AC terminal being connected to the first three-phase outgoing line group;

[0007] a first switch module, configured to connect the power input terminal to the first DC terminal or short-circuit the first DC terminal;

[0008] a second power module, the second power module comprising a second DC terminal and a second AC terminal, the second AC terminal being connected to the second three-phase outgoing line group;

[0009] Energy storage devices;

[0010] a second switch module, configured to connect the energy storage device to the second DC terminal or short-circuit the second DC terminal;

[0011] A control module is configured to output a control signal to the first power module and the second power module according to states of the first switch module and the second switch module.

[0012] The drive control circuit provided in accordance with an embodiment of the present invention has at least the following beneficial effects: by configuring the first switch module to connect the power input terminal to the first power module or short-circuit the first DC terminal of the first power module, and configuring the second switch module to connect the energy storage device to the second power module or short-circuit the second DC terminal of the second power module, the drive control circuit has multiple working states to be applicable to different scenarios. For example, under normal load, the first switch module can connect the power input terminal to the first power module and the second switch module can short-circuit the second DC terminal of the second power module, and the three-phase winding is in star connection operation; under high load state, the first switch module can connect the power input terminal to the first power module and the second switch module can connect the energy storage device To the second power module, the three-phase winding is in an open-winding connection mode; in an emergency state where the power input end suddenly loses power, the first switch module can short-circuit the first DC end of the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in a star connection mode and obtains electrical energy from the energy storage device; when the open-winding motor needs emergency braking, the first switch module can short-circuit the first DC end of the first power module and the second switch module can short-circuit the second DC end of the second power module, thereby cutting off all power to the open-winding motor; in addition, the control module is configured to output control signals to the first power module and the second power module according to the states of the first switch module and the second switch module, so that the drive control circuit can operate reliably and efficiently under various working conditions.

[0013] The above-mentioned drive control circuit further includes a rectifier module, wherein the input end of the rectifier module is connected to the power input end, and the output end of the rectifier module is connected to the first switch module.

[0014] By providing a rectifier module, the alternating current from the power input terminal is converted into direct current, which is then transmitted to the first switch module.

[0015] The above-mentioned drive control circuit further includes a first capacitor, which is connected in parallel between the output end of the rectifier module and the first switch module.

[0016] By arranging the first capacitor between the output end of the rectifier module and the first switch module, it can play both the role of energy storage and the role of filtering.

[0017] In addition, the first embodiment of the present invention further provides a drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of the winding of each phase constitutes a first three-phase outgoing wire group, and the other end of the winding of each phase constitutes a second three-phase outgoing wire group, including:

[0018] a first power module, wherein a power input end is connected to the first three-phase outgoing line group through the first power module;

[0019] a second power module, the second power module comprising a second DC terminal and a second AC terminal, the second AC terminal being connected to the second three-phase outgoing line group;

[0020] Energy storage devices;

[0021] a second switch module, configured to connect the energy storage device to the second DC terminal or short-circuit the second DC terminal;

[0022] A control module is configured to output a control signal to the first power module and the second power module according to a state of the second switch module.

[0023] Compared with the aforementioned driving control circuit having both the first switch module and the second switch module, the driving control circuit provided in this embodiment reduces the first switch module.

[0024] In addition, the first embodiment of the present invention further provides a drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of the winding of each phase constitutes a first three-phase outgoing wire group, and the other end of the winding of each phase constitutes a second three-phase outgoing wire group, including:

[0025] a first power module, the first power module comprising a first DC terminal and a first AC terminal, the first AC terminal being connected to the first three-phase outgoing line group;

[0026] a first switch module, configured to connect the power input terminal to the first DC terminal or short-circuit the first DC terminal;

[0027] a second power module, the second power module comprising a second DC terminal and a second AC terminal, the second AC terminal being connected to the second three-phase outgoing line group;

[0028] an energy storage device connected to the second DC terminal;

[0029] A control module is configured to output a control signal to the first power module and the second power module according to a state of the first switch module.

[0030] Compared with the aforementioned driving control circuit having both the first switch module and the second switch module, the driving control circuit provided in this embodiment reduces the second switch module.

[0031] In a second aspect, an embodiment of the present invention provides a drive control method, which is applied to a drive control circuit including a first switch module, a first power module, a second power module, a second switch module, and an energy storage device, wherein the drive control circuit is used to drive an open-winding motor having a three-phase winding, one end of the winding of each phase constitutes a first three-phase outgoing line group, and the other end of the winding of each phase constitutes a second three-phase outgoing line group, the first power module includes a first DC terminal and a first AC terminal, the first AC terminal is connected to the first three-phase outgoing line group, the first switch module is respectively connected to the power input terminal and the first DC terminal, the second power module includes a second DC terminal and a second AC terminal, the second AC terminal is connected to the second three-phase outgoing line group, and the second switch module is respectively connected to the energy storage device and the second DC terminal. The method includes:

[0032] Controlling the first switch module to connect the power input terminal to the first DC terminal or to short-circuit the first DC terminal;

[0033] controlling the second switch module to connect the energy storage device to the second DC terminal or to short-circuit the second DC terminal;

[0034] A control signal is output to the first power module and the second power module according to states of the first switch module and the second switch module.

[0035] The drive control method provided by the embodiment of the present invention has at least the following beneficial effects: the drive control circuit configures the first switch module to connect the power input terminal to the first power module or short-circuit the first DC terminal of the first power module, and configures the second switch module to connect the energy storage device to the second power module or short-circuit the second DC terminal of the second power module, so that the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module can connect the power input terminal to the first power module and the second switch module can short-circuit the second DC terminal of the second power module, and the three-phase winding is in star connection operation; under high load state, the first switch module can connect the power input terminal to the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in open winding connection. method of operation; in an emergency state where the power input end suddenly loses power, the first switch module can be made to short-circuit the first DC end of the first power module and the second switch module can be made to connect the energy storage device to the second power module, and the three-phase winding is in a star connection and obtains power from the energy storage device; when the open-winding motor needs emergency braking, the first switch module can be made to short-circuit the first DC end of the first power module and the second switch module can be made to short-circuit the second DC end of the second power module, thereby cutting off all power supply to the open-winding motor; therefore, the drive control method can control the connection state of the first switch module and the second switch module to enable the drive control circuit to operate in different working states, and output control signals to the first power module and the second power module according to the states of the first switch module and the second switch module, so that the drive control circuit can operate reliably and efficiently under various working states.

[0036] In the above-mentioned drive control method, when the first switch module connects the power input terminal to the first DC terminal and the second switch module shorts the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes:

[0037] Outputting a PWM control signal to the first power module using PWM control technology;

[0038] The second power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module.

[0039] When the first switch module connects the power input to the first DC terminal and the second switch module shorts the second DC terminal, power is transmitted from the power input to the first switch module and then, through the first power module, to the three-phase winding. Because the second switch module shorts the second DC terminal of the second power module, the three-phase winding operates in a star configuration, powered by a single-ended power input. PWM control technology is then used to output a PWM control signal to the first power module. The duty cycle is calculated based on the load conditions to control the high-frequency switching of each power switch in the first power module. Furthermore, the second power module is controlled based on the current flow in the three-phase winding, so that the current flowing from the second power module to the three-phase winding alternately converges on the positive and negative busbars of the second power module. This method of controlling the power switches in the second power module ensures a more balanced on-off time for each power switch in the second power module, thereby preventing damage to individual switches caused by extended on-times and ensuring the reliability of the drive control circuit.

[0040] In the above-mentioned drive control method, when the first switch module connects the power input terminal to the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes:

[0041] A PWM control technology is used to output a PWM control signal to the first power module and the second power module.

[0042] When the first switch module connects the power input terminal to the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, the three-phase winding is in an open-winding connection mode, and can obtain electric energy from the first three-phase output line group and the second three-phase output line group respectively. At this time, the PWM control technology outputs PWM control signals to the first power module and the second power module respectively, calculates the duty cycle according to the load conditions, and controls each power switch tube of the first power module and the second power module to perform high-frequency switching, which is suitable for the high-speed operation mode of the open-winding motor.

[0043] In the above-mentioned drive control method, when the first switch module shorts the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes:

[0044] Outputting a PWM control signal to the second power module using PWM control technology;

[0045] The first power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module.

[0046] When the first switch module short-circuits the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, electrical energy is transferred from the energy storage device to the second switch module, and then to the three-phase winding via the second power module. Since the first switch module short-circuits the first DC terminal of the first power module, the three-phase winding operates in a star configuration, powered by a single end of the energy storage device. At this point, PWM control technology is used to output a PWM control signal to the second power module, calculating the duty cycle based on the load to control the high-frequency switching of each power switch in the second power module. This operating state is generally suitable for emergency situations such as sudden power loss at the power input. The energy storage device provides electrical energy to the three-phase winding, thereby improving the reliability of open-winding motor operation. In addition, the first power module will be controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding alternately converges on the positive bus and negative bus of the first power module. By controlling the various power switching tubes of the first power module in this way, the on-off time of the various power switching tubes of the first power module can be relatively balanced, thereby avoiding the long conduction time of individual switching tubes and easy damage, thereby ensuring the reliability of the operation of the drive control circuit.

[0047] In the above drive control method, when the first switch module connects the power input terminal to the first DC terminal and the second switch module short-circuits the second DC terminal, the following steps are also included:

[0048] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the second power module to be turned on;

[0049] controlling the second switch module to connect the energy storage device to the second DC terminal;

[0050] A PWM control technology is used to output a PWM control signal to the second power module.

[0051] When it is necessary to switch from single-ended power supply operation at the power input end to dual-ended power supply operation at the power input end and the energy storage device, the upper switch tube or the lower switch tube of the three bridge arms of the second power module is first controlled to be turned on to replace the function of the second switch module. Then, the second switch module is controlled to connect the energy storage device to the second DC end, and the three-phase winding is switched to an open winding connection method. Finally, PWM control technology is used to output a PWM control signal to the second power module. The switching process is simple and convenient.

[0052] In the above drive control method, when the first switch module connects the power input terminal to the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, the following steps are further included:

[0053] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the second power module to be turned on;

[0054] Controlling the second switch module to short-circuit the second DC terminal;

[0055] The second power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module.

[0056] When it is necessary to switch from dual-end power supply operation of the power input terminal and the energy storage device to single-end power supply operation of the power input terminal, first control the upper switch tube or the lower switch tube of the three bridge arms of the second power module to conduct, then control the second switch module to short-circuit the second DC terminal, and switch the three-phase winding to a star connection. Finally, the second power module is controlled according to the current flow direction of the three-phase winding so that the current flowing from the second power module to the three-phase winding alternately converges at the positive bus and negative bus of the second power module. The switching process is simple and convenient. It can be understood that this switching process is the reverse process of the above-mentioned switching from single-end power supply operation of the power input terminal to dual-end power supply operation of the power input terminal and the energy storage device.

[0057] In the above drive control method, when the first switch module connects the power input terminal to the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, the following steps are further included:

[0058] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the first power module to be turned on;

[0059] Controlling the first switch module to short-circuit the first DC terminal;

[0060] The first power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module.

[0061] When it is necessary to switch from dual-end power supply operation of the power input end and the energy storage device to single-end power supply operation of the energy storage device, first control the upper switch tube or the lower switch tube of the three bridge arms of the first power module to be turned on, then control the first switch module to short-circuit the first DC end, and switch the three-phase winding to a star connection. Finally, the first power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding alternately converges on the positive bus and negative bus of the first power module. The switching process is simple and convenient.

[0062] In the above drive control method, when the first switch module short-circuits the first DC terminal and the energy storage device of the second switch module is connected to the second DC terminal, the following steps are also included:

[0063] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the first power module to be turned on;

[0064] Controlling the first switch module to connect the power input terminal to the first DC terminal;

[0065] A PWM control technology is used to output a PWM control signal to the first power module.

[0066] When it is necessary to switch from single-end power supply operation of the energy storage device to dual-end power supply operation of the power input end and the energy storage device, the upper switch tube or the lower switch tube of the three bridge arms of the first power module is first controlled to be turned on to replace the function of the first switch module, and then the first switch module is controlled to connect the power input end to the first DC end, and the three-phase winding is switched to an open winding connection method. Finally, PWM control technology is used to output a PWM control signal to the first power module. The switching process is simple and convenient.

[0067] In a third aspect, an embodiment of the present invention provides a circuit board, comprising the drive control circuit as described in the embodiment of the first aspect of the present invention.

[0068] The circuit board provided in accordance with an embodiment of the present invention has at least the following beneficial effects: the drive control circuit configures the first switch module to connect the power input terminal to the first power module or short-circuit the first DC terminal of the first power module, and configures the second switch module to connect the energy storage device to the second power module or short-circuit the second DC terminal of the second power module, so that the drive control circuit has multiple working states to be applicable to different scenarios. For example, under normal load, the first switch module can connect the power input terminal to the first power module and the second switch module can short-circuit the second DC terminal of the second power module, and the three-phase winding is in star connection operation; under high load state, the first switch module can connect the power input terminal to the first power module and the second switch module can connect the energy storage device to the second power module. When connected to the second power module, the three-phase winding is in an open-winding connection mode; in an emergency state where the power input end suddenly loses power, the first switch module can short-circuit the first DC end of the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in a star connection mode and obtains electrical energy from the energy storage device; when the open-winding motor needs emergency braking, the first switch module can short-circuit the first DC end of the first power module and the second switch module can short-circuit the second DC end of the second power module, thereby cutting off all power supply to the open-winding motor; in addition, the control module is configured to output control signals to the first power module and the second power module according to the states of the first switch module and the second switch module, so that the drive control circuit can operate reliably and efficiently under various working conditions.

[0069] In a fourth aspect, an embodiment of the present invention provides an air conditioner, comprising the circuit board according to the embodiment of the third aspect of the present invention;

[0070] or,

[0071] It includes at least one processor and a memory for communicating with the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the drive control method as described in the embodiment of the second aspect of the present invention.

[0072] The air conditioner provided according to the embodiment of the present invention has at least the following beneficial effects: the drive control circuit is configured with a first switch module for connecting the power input terminal to the first power module or short-circuiting the first DC terminal of the first power module, and a second switch module for connecting the energy storage device to the second power module or short-circuiting the second DC terminal of the second power module, so that the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module can connect the power input terminal to the first power module and the second switch module can short-circuit the second DC terminal of the second power module, and the three-phase winding is in a star connection; under high load, the first switch module can connect the power input terminal to the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in an open winding connection. Operation; in an emergency state where the power input end suddenly loses power, the first switch module can short-circuit the first DC end of the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in star connection and obtains electrical energy from the energy storage device; when the open-winding motor needs emergency braking, the first switch module can short-circuit the first DC end of the first power module and the second switch module can short-circuit the second DC end of the second power module to cut off all power supply to the open-winding motor; therefore, the drive control method can control the connection state of the first switch module and the second switch module to make the drive control circuit operate in different working states, and output control signals to the first power module and the second power module according to the states of the first switch module and the second switch module, so that the drive control circuit can operate reliably and efficiently under various working states.

[0073] In a fifth aspect, an embodiment of the present invention provides a computer storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the drive control method as described in the embodiment of the second aspect of the present invention.

[0074] The computer storage medium provided in accordance with an embodiment of the present invention has at least the following beneficial effects: the drive control circuit configures the first switch module to connect the power input terminal to the first power module or short-circuit the first DC terminal of the first power module, and configures the second switch module to connect the energy storage device to the second power module or short-circuit the second DC terminal of the second power module, so that the drive control circuit has multiple working states to be applicable to different scenarios. For example, under normal load, the first switch module can connect the power input terminal to the first power module and the second switch module can short-circuit the second DC terminal of the second power module, and the three-phase winding is in star connection operation; under high load state, the first switch module can connect the power input terminal to the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in open winding state. connection method; in an emergency state where the power input end suddenly loses power, the first switch module can short-circuit the first DC end of the first power module and the second switch module can connect the energy storage device to the second power module, and the three-phase winding is in star connection operation and obtains electric energy from the energy storage device; when the open-winding motor needs emergency braking, the first switch module can short-circuit the first DC end of the first power module and the second switch module can short-circuit the second DC end of the second power module to cut off all power supply to the open-winding motor; therefore, the drive control method can control the connection state of the first switch module and the second switch module to make the drive control circuit operate in different working states, and output control signals to the first power module and the second power module according to the states of the first switch module and the second switch module, so that the drive control circuit can operate reliably and efficiently under various working states.

[0075] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0077] Figure 1 is a circuit schematic diagram of a drive control circuit provided by an embodiment of the present invention;

[0078] Figure 2 is a structural diagram of a first switch module provided by an embodiment of the present invention;

[0079] Figure 3 is a structural diagram of another first switch module provided by an embodiment of the present invention;

[0080] Figure 4is a structural diagram of another first switch module provided by an embodiment of the present invention;

[0081] Figure 5 is a structural diagram of an energy storage device provided by an embodiment of the present invention;

[0082] Figure 6 is a structural diagram of another energy storage device provided by an embodiment of the present invention;

[0083] Figure 7 is a structural diagram of another energy storage device provided by an embodiment of the present invention;

[0084] Figure 8 is a structural diagram of another energy storage device provided by an embodiment of the present invention;

[0085] Figure 9 is a structural diagram of a power module provided by an embodiment of the present invention;

[0086] Figure 10 is a flow chart of a drive control method provided by an embodiment of the present invention;

[0087] Figure 11 1 is a schematic diagram of a working state 1 of a drive control circuit provided by an embodiment of the present invention;

[0088] Figure 12 2 is a schematic diagram of a working state 2 of a drive control circuit provided by an embodiment of the present invention;

[0089] Figure 13 3 is a schematic diagram of a working state 3 of a drive control circuit provided by an embodiment of the present invention;

[0090] Figure 14 4 is a schematic diagram of a working state 4 of a drive control circuit provided by an embodiment of the present invention;

[0091] Figure 15 It is a schematic diagram of the switching conditions of each power module and switch module in the working state and transition state of the drive control circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0092] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0093] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0094] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0095] The embodiments of the present invention provide a drive control circuit, a drive control method, a circuit board, and an air conditioner, which have multiple working states and can operate reliably and efficiently in various working states.

[0096] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0097] Reference Figure 1 In a first aspect, an embodiment of the present invention provides a drive control circuit for driving an open-winding motor 100 having three-phase windings, wherein one end of each phase winding constitutes a first three-phase output wire group 110, and the other end of each phase winding constitutes a second three-phase output wire group 120. The drive control circuit includes a first power module 200, a first switch module 300, a second power module 500, an energy storage device 600, and a second switch module 700, wherein:

[0098] The first power module 200 includes a first DC terminal 210 and a first AC terminal 220 , and the first AC terminal 220 is connected to the first three-phase outgoing line group 110 ;

[0099] The first switch module 300 is used to connect the power input terminal 400 to the first DC terminal 210 or short-circuit the first DC terminal 210;

[0100] The second power module 500 includes a second DC terminal 510 and a second AC terminal 520 , and the second AC terminal 520 is connected to the second three-phase outgoing line group 120 ;

[0101] The second switch module 700 is used to connect the energy storage device 600 to the second DC terminal 510 or short-circuit the second DC terminal 510;

[0102] The control module is configured to output control signals to the first power module 200 and the second power module 500 according to states of the first switch module 300 and the second switch module 700 .

[0103] According to the drive control circuit provided by the embodiment of the present invention, by configuring the first switch module 300 to connect the power input terminal 400 to the first power module 200 or short-circuit the first DC terminal 210 of the first power module 200, and configuring the second switch module 700 to connect the energy storage device 600 to the second power module 500 or short-circuit the second DC terminal 510 of the second power module 500, the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, and the three-phase winding is in star connection operation, and is powered by the power input terminal 400 at a single end; under high load state, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 5 00, the three-phase winding is in open-winding connection mode, and is powered by both the power input terminal 400 and the energy storage device; in an emergency state where the power input terminal 400 suddenly loses power, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in star connection mode and obtains power from the energy storage device 600; when the open-winding motor 100 needs emergency braking, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, thereby cutting off all power to the open-winding motor 100; in addition, the control module is configured to output control signals to the first power module 200 and the second power module 500 according to the states of the first switch module 300 and the second switch module 700, so that the drive control circuit can operate reliably and efficiently under various working conditions.

[0104] In the above Figure 1 The driving control circuit further includes a rectifier module 800 , an input end of the rectifier module 800 is connected to the power input end 400 , and an output end of the rectifier module 800 is connected to the first switch module 300 .

[0105] By providing the rectifier module 800 , the alternating current from the power input terminal 400 is converted into direct current, which is then transmitted to the first switch module 300 .

[0106] In the above Figure 1 The driving control circuit further includes a first capacitor C1, which is connected in parallel between the output end of the rectifier module 800 and the first switch module 300.

[0107] By providing the first capacitor C1 between the output end of the rectifier module 800 and the first switch module 300 , it can play both the role of energy storage and the role of filtering.

[0108] The first switch module 300 mainly functions to connect the power input terminal 400 to the first DC terminal 210 or short-circuit the first DC terminal 210. Figure 2 The single-pole double-throw mechanical switch K1 shown is shown in FIG. Figure 1 , point b of switch K1 is connected to the positive pole of the output terminal of the rectifier module 800, point c of switch K1 is connected to the negative pole of the output terminal of the rectifier module 800 and the negative pole of the first DC terminal 210, point a of switch K1 is connected to the positive pole of the first DC terminal 210, and switch K1 has two states to choose from: point a and point b are conductive and point a and point c are disconnected, and point a and point c are conductive and point a and point b are disconnected. In addition, in addition to using Figure 2 A single-pole double-throw mechanical switch can also be used Figure 3 The two mechanical switches shown are combined or Figure 4 This is achieved by combining multiple switching tubes as shown.

[0109] Similarly, for the second switch module 700, you can use Figure 2 The single-pole double-throw mechanical switch shown can also be used Figure 3 The two mechanical switches shown are combined or Figure 4 This is achieved by combining multiple switch tubes as shown, which will not be described here in detail.

[0110] For the energy storage device 600, it can be Figure 5 The capacitance shown is Figure 6 The battery shown is Figure 7 The capacitor plus battery shown is a capacitor plus a DC converter plus a battery or a Figure 8 The capacitor plus half bridge plus inductor plus battery shown, where Figure 8 The battery in the battery can also be replaced by a capacitor.

[0111] In addition, the first power module 200 and the second power module 500 may be implemented by using MOSFET separation devices, IGBT separation devices or intelligent power modules (IPM). Figure 9A common case of a power module is given. The power module includes three bridge arms connected in parallel, namely a first bridge arm, a second bridge arm, and a third bridge arm. The first bridge arm includes a first upper switch tube AH and a first lower switch tube AL connected in series. The second bridge arm includes a second upper switch tube BH and a second lower switch tube BL connected in series. The third bridge arm includes a third upper switch tube CH and a third lower switch tube CL connected in series. For the convenience of description, the first upper switch tube AH, the second upper switch tube BH, and the third upper switch tube CH are respectively the upper bridge switch tubes of the bridge arm, and the three are collectively referred to as the upper three bridge switch tubes of the power module; similarly, the first lower switch tube AL, the second lower switch tube BL, and the third lower switch tube CL are respectively the lower bridge switch tubes of the bridge arm, and the three are collectively referred to as the lower three bridge switch tubes of the power module.

[0112] The first power module 200 and the second power module 500 have the following four states:

[0113] OFF state: the upper three-bridge switch tubes and the lower three-bridge switch tubes are all turned off;

[0114] State 1: The control module uses PWM control technology to output PWM control signals for control;

[0115] State 2: The current flow direction of the three-phase winding of the control module controls the on-off of each switch tube of the power module. At this time, the switching frequency of each switch tube is at the same level as the current base frequency. By controlling the on-off of each switch tube, the current flowing from the power module to the three-phase winding of the open-winding motor 100 is alternately converged at the positive bus and negative bus of the power module; here combined Figure 1 and Figure 9 The power module is explained to operate in state 3: the three bridge arms of the power module are respectively connected to the three-phase windings of the open-winding motor 100. At a certain moment, the current of one bridge arm of the power module will flow to one-phase winding of the open-winding motor 100, or the current of two bridge arms of the power module will flow to two-phase windings of the open-winding motor 100 respectively; when the current flowing to the three-phase winding of the power module is to be converged at the positive bus of the power module, it is necessary to conduct the current to the upper switch tube of the bridge arm of the open-winding motor 100. For example, if the current of the first bridge arm of the power module flows to a single-phase winding of the open-winding motor 100, the upper switch of the first bridge arm is controlled to be turned on. For another example, if the current of the first bridge arm and the second bridge arm of the power module flows to two-phase windings of the open-winding motor 100 respectively, the upper switches of the first bridge arm and the first bridge arm are controlled to be turned on. Similarly, when the current flowing from the power module to the three-phase winding is to be converged at the negative busbar of the power module, the lower switch tube of the bridge arm of the open-winding motor 100 needs to be turned on.

[0116] State 3: Only the upper three bridge switches are turned on or only the lower three bridge switches are turned on.

[0117] In addition, an embodiment of the first aspect of the present invention also provides a drive control circuit for driving an open-winding motor 100 having a three-phase winding, wherein one end of the winding of each phase constitutes a first three-phase output line group 110, and the other end of the winding of each phase constitutes a second three-phase output line group 120. The drive control circuit includes a first power module 200, a second power module 500, an energy storage device 600, a second switch module 700 and a control module. The power input end 400 is connected to the first three-phase output line group 110 through the first power module 200; the second power module 500 includes a second DC end 510 and a second AC end 520, and the second AC end 520 is connected to the second three-phase output line group 120; the second switch module 700 is used to connect the energy storage device 600 to the second DC end 510 or short-circuit the second DC end 510; the control module 600 is used to output a control signal to the first power module 200 and the second power module 500 according to the state of the second switch module 700.

[0118] Compared with the above Figure 1 The drive control circuit has both the first switch module 300 and the second switch module 700. The drive control circuit provided in this embodiment reduces the first switch module 300, which is equivalent to Figure 1 A reduced version of the drive control circuit.

[0119] In addition, an embodiment of the first aspect of the present invention further provides a drive control circuit for driving an open-winding motor 100 having a three-phase winding, wherein one end of the winding of each phase constitutes a first three-phase output line group 110, and the other end of the winding of each phase constitutes a second three-phase output line group 120, including a first power module 200, a first switch module 300, a second power module 500, an energy storage device 600 and a control module; the first power module 200 includes a first DC end 210 and a first AC end 220, and the first AC end 220 is connected to the first three-phase output Line group 110; the first switch module 300 is used to connect the power input terminal 400 to the first DC terminal 210 or short-circuit the first DC terminal 210; the second power module 500 includes a second DC terminal 510 and a second AC terminal 520, and the second AC terminal 520 is connected to the second three-phase outgoing line group 120; the energy storage device 600 is connected to the second DC terminal 510; the control module is used to output a control signal to the first power module 200 and the second power module 500 according to the state of the first switch module 200.

[0120] Compared with the above Figure 1 The drive control circuit has both the first switch module 300 and the second switch module 700. The drive control circuit provided in this embodiment reduces the second switch module 700, which is equivalent to Figure 1 A reduced version of the drive control circuit.

[0121] In a second aspect, an embodiment of the present invention provides a drive control method, which is applied to Figure 1 The drive control circuit shown includes a first switch module 300, a first power module 200, a second power module 500, a second switch module 700 and an energy storage device 600. The drive control circuit is used to drive an open-winding motor 100 having a three-phase winding, one end of each phase winding constitutes a first three-phase output group 110, and the other end of each phase winding constitutes a second three-phase output group 120. The first power module 200 includes a first DC terminal 210 and a first AC terminal 220, and the first AC terminal 220 is connected to the first three-phase output group 110. The first switch module 300 is respectively connected to the power input terminal 400 and the first DC terminal 210. The second power module 500 includes a second DC terminal 510 and a second AC terminal 520, and the second AC terminal 520 is connected to the second three-phase output group 120. The second switch module 700 is respectively connected to the energy storage device 600 and the second DC terminal 510. Figure 10 , the method comprises the following steps:

[0122] Step S1010: controlling the first switch module 300 to connect the power input terminal 400 to the first DC terminal 210 or short-circuit the first DC terminal 210;

[0123] Step S1020: controlling the second switch module 700 to connect the energy storage device 600 to the second DC terminal 510 or short-circuit the second DC terminal 510;

[0124] Step S1030 : outputting a control signal to the first power module 200 and the second power module 500 according to the states of the first switch module 300 and the second switch module 700 .

[0125] According to the drive control method provided by an embodiment of the present invention, the drive control circuit configures the first switch module 300 to connect the power input terminal 400 to the first power module 200 or short-circuit the first DC terminal 210 of the first power module 200, and configures the second switch module 700 to connect the energy storage device 600 to the second power module 500 or short-circuit the second DC terminal 510 of the second power module 500, so that the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, and the three-phase winding is in a star connection operation; under high load state, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in an open winding connection operation; In an emergency state where the source input terminal 400 suddenly loses power, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in star connection operation and obtains electrical energy from the energy storage device 600; when the open-winding motor 100 needs emergency braking, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, thereby cutting off all power supply to the open-winding motor 100; therefore, the drive control method can control the connection status of the first switch module 300 and the second switch module 700 to enable the drive control circuit to operate in different working states, and output control signals to the first power module 200 and the second power module 500 according to the status of the first switch module 300 and the second switch module 700, so that the drive control circuit can operate reliably and efficiently under various working states.

[0126] Based on the above Figure 10 In the driving control method shown, when the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 in step S1010 and the second switch module 700 shorts the second DC terminal 510 in step S1020, the connection state of the driving control circuit is as follows: Figure 11 As shown, step S1030 outputs a control signal to the first power module 200 and the second power module 500 according to the states of the first switch module 300 and the second switch module 700, and specifically includes the following steps:

[0127] Using PWM control technology to output a PWM control signal to the first power module 200, that is, controlling the first power module 200 to operate in state 2;

[0128] The second power module 500 is controlled according to the current flow direction of the three-phase winding so that the current flowing from the second power module 500 to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module 500, that is, the second power module 500 is controlled to operate in state 3. Figure 9 and Figure 11 The second power module 500 is explained to operate in state 3: the three bridge arms of the second power module 500 are respectively connected to the three-phase windings of the open-winding motor 100. At a certain moment, the current of one bridge arm of the second power module 500 will flow to one-phase winding of the open-winding motor 100, or the current of two bridge arms of the second power module 500 will flow to two-phase windings of the open-winding motor 100 respectively; when the current of the second power module 500 flowing to the three-phase winding is to be converged at the positive bus of the second power module 500, it is necessary to flow the current to the bridge arm of the open-winding motor 100. The upper switch tube can be turned on. For example, if the current of the first bridge arm of the second power module 500 flows to a single-phase winding of the open-winding motor 100, the upper switch of the first bridge arm is controlled to be turned on. For example, if the current of the first bridge arm and the second bridge arm of the second power module 500 respectively flows to the two-phase windings of the open-winding motor 100, the upper switches of the first bridge arm and the first bridge arm are controlled to be turned on. Similarly, when the current of the second power module 500 flowing to the three-phase winding is to be converged at the negative bus of the second power module 500, the lower switch tube of the bridge arm of the open-winding motor 100 needs to be turned on.

[0129] When the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 short-circuits the second DC terminal 510, power is transmitted from the power input terminal 400 to the first switch module 300, and then transmitted to the three-phase winding through the first power module 200. Since the second switch module 700 short-circuits the second DC terminal 510 of the second power module 500, the three-phase winding operates in a star connection and is powered by a single end of the power input terminal 400. At this time, PWM control technology is used to output a PWM control signal to the first power module 200, and the duty cycle is calculated according to the load condition to control the high-frequency switching of each power switch tube of the first power module 200.

[0130] In addition, the second power module 500 will be controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module 500 to the three-phase winding alternately converges on the positive bus and the negative bus of the second power module 500. By controlling the various power switch tubes of the second power module 500 in this way, the on-off time of the various power switch tubes of the second power module 500 can be relatively balanced, thereby avoiding the long conduction time of individual switch tubes and easy damage, thereby ensuring the reliability of the operation of the drive control circuit.

[0131] Based on the above Figure 10In the driving control method shown in FIG. 1 , when the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 in step S1010 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510 in step S1020, the connection state of the driving control circuit is as follows: Figure 12 As shown, step S1030 outputs a control signal to the first power module 200 and the second power module 500 according to the states of the first switch module 300 and the second switch module 700, and specifically includes the following steps:

[0132] The PWM control technology is used to output a PWM control signal to the first power module 200 and the second power module 500 .

[0133] When the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510, the three-phase winding is in an open-winding connection mode, and can obtain electrical energy from the first three-phase outgoing line group 110 and the second three-phase outgoing line group 120 respectively. At this time, the PWM control technology outputs PWM control signals to the first power module 200 and the second power module 500 respectively, and calculates the duty cycle according to the load conditions to control the various power switch tubes of the first power module 200 and the second power module 500 to perform high-frequency switching, which is suitable for the high-speed operation mode of the open-winding motor 100.

[0134] Based on the above Figure 10 In the driving control method shown in FIG. 1 , when the first switch module 300 short-circuits the first DC terminal 210 in step S1010 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510 in step S1020, the connection state of the driving control circuit is as follows: Figure 13 As shown, step S1030 outputs a control signal to the first power module 200 and the second power module 500 according to the states of the first switch module 300 and the second switch module 700, and specifically includes the following steps:

[0135] Outputting a PWM control signal to the second power module 500 using PWM control technology;

[0136] The first power module 200 is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module 200 to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module 200 .

[0137] When the first switch module 300 short-circuits the first DC terminal 210 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510, electrical energy is transmitted from the energy storage device 600 to the second switch module 700, and then transmitted to the three-phase winding through the second power module 500. Because the first switch module 300 short-circuits the first DC terminal 210 of the first power module 200, the three-phase winding operates in a star configuration, powered by a single-ended supply from the energy storage device 600. At this point, PWM control technology is used to output a PWM control signal to the second power module 500, calculating the duty cycle based on the load to control the high-frequency switching of each power switch in the second power module 500. This operating state is generally suitable for emergency situations where the power input terminal 400 suddenly loses power. The energy storage device 600 provides electrical energy to the three-phase winding, thereby improving the reliability of the open-winding motor 100. In addition, the first power module 200 will be controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module 200 to the three-phase winding alternately converges on the positive bus and the negative bus of the first power module 200. By controlling the various power switching tubes of the first power module 200 in this way, the on-off time of the various power switching tubes of the first power module 200 can be relatively balanced, thereby avoiding the long conduction time of individual switching tubes and easy damage, thereby ensuring the reliability of the operation of the drive control circuit.

[0138] In addition, based on the above Figure 10 In the driving control method shown in FIG. 1 , when the first switch module 300 short-circuits the first DC terminal 210 in step S1010 and the second switch module 700 short-circuits the second DC terminal 510 in step S1020, the connection state of the driving control circuit is as follows: Figure 14 As shown, at this time, there is no power supply at both ends of the open-winding motor 100, and all power supplies of the open-winding motor 100 are cut off. The open-winding motor 100 is in a braking state, and the first power module 200 and the second power module 500 can both be in the OFF state.

[0139] In order to conveniently describe the switching process of the drive control circuit between several working states, working state 1, working state 2, working state 3 and working state 4 are used to distinguish them, as follows:

[0140] Working state 1: Figure 11 As shown, the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 short-circuits the second DC terminal 510. The first power module 200 operates in state 1 and the second power module 500 operates in state 2.

[0141] Working state 2: Figure 12As shown, the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510, the first power module 200 operates in state 2, and the second power module 500 operates in state 2;

[0142] Working state 3: Figure 13 As shown, the first switch module 300 short-circuits the first DC terminal 210 and the second switch module 700 and the energy storage device 600 are connected to the second DC terminal 510 . The first power module 200 operates in state 2 and the second power module 500 operates in state 1 .

[0143] Working state 4: Figure 14 As shown, the first switch module 300 short-circuits the first DC terminal 210 , and the second switch module 700 short-circuits the second DC terminal 510 .

[0144] When the connection status of the drive control circuit is as follows Figure 11 As shown, in working state 1, that is, when the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 short-circuits the second DC terminal 510, the following steps are also included:

[0145] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the second power module 500 to be turned on;

[0146] Controlling the second switch module 700 to connect the energy storage device 600 to the second DC terminal 510;

[0147] The PWM control technology is adopted to output a PWM control signal to the second power module 500 .

[0148] When it is necessary to switch from single-ended power supply operation of the power input terminal 400 to dual-ended power supply operation of the power input terminal 400 and the energy storage device 600, that is, it is necessary to switch from working state 1 to working state 2, first control the upper switch tube or the lower switch tube of the three bridge arms of the second power module 500 to be turned on to replace the function of the second switch module 700, and then control the second switch module 700 to connect the energy storage device 600 to the second DC terminal 510, switch the three-phase winding to an open winding connection, and finally use PWM control technology to output a PWM control signal to the second power module 500. The switching process is simple and convenient.

[0149] When the connection status of the drive control circuit is as follows Figure 12 As shown, in working state 2, that is, when the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510, the following steps are also included:

[0150] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the second power module 500 to be turned on;

[0151] Controlling the second switch module 700 to short-circuit the second DC terminal 510;

[0152] The second power module 500 is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module 500 to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module 500 .

[0153] When it is necessary to switch from dual-end power supply operation of the power input terminal 400 and the energy storage device 600 to single-end power supply operation of the power input terminal 400, that is, it is necessary to switch from working state 2 to working state 1, first control the upper switch tube or the lower switch tube of the three bridge arms of the second power module 500 to conduct, then control the second switch module 700 to short-circuit the second DC terminal 510, switch the three-phase winding to a star connection, and finally control the second power module 500 according to the current flow direction of the three-phase winding so that the current flowing from the second power module 500 to the three-phase winding alternately converges at the positive bus and negative bus of the second power module 500. The switching process is simple and convenient. It can be understood that this switching process is the reverse process of the above-mentioned switching from single-end power supply operation of the power input terminal 400 to dual-end power supply operation of the power input terminal 400 and the energy storage device 600.

[0154] When the connection status of the drive control circuit is as follows Figure 12 As shown, in working state 2, that is, when the first switch module 300 connects the power input terminal 400 to the first DC terminal 210 and the second switch module 700 connects the energy storage device 600 to the second DC terminal 510, the following steps are also included:

[0155] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the first power module 200 to be turned on;

[0156] Controlling the first switch module 300 to short-circuit the first DC terminal 210;

[0157] The first power module 200 is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module 200 to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module 200 .

[0158] When it is necessary to switch from the dual-end power supply operation of the power input terminal 400 and the energy storage device 600 to the single-end power supply operation of the energy storage device 600, that is, it is necessary to switch from working state 2 to working state 3, first control the upper switch tube or the lower switch tube of the three bridge arms of the first power module 200 to be turned on, then control the first switch module 300 to short-circuit the first DC terminal 210, and switch the three-phase winding to a star connection. Finally, the first power module 200 is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module 200 to the three-phase winding alternately converges at the positive bus and the negative bus of the first power module 200. The switching process is simple and convenient.

[0159] When the connection status of the drive control circuit is as follows Figure 13 As shown, in working state 3, that is, when the first switch module 300 short-circuits the first DC terminal 210 and the energy storage device 600 of the second switch module 700 is connected to the second DC terminal 510, the following steps are also included:

[0160] Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the first power module 200 to be turned on;

[0161] Controlling the first switch module 300 to connect the power input terminal 400 to the first DC terminal 210;

[0162] The PWM control technology is adopted to output a PWM control signal to the first power module 200 .

[0163] When it is necessary to switch from single-ended power supply operation of the energy storage device 600 to dual-ended power supply operation of the power input terminal 400 and the energy storage device 600, that is, it is necessary to switch from working state 3 to working state 2, the upper switch tube or the lower switch tube of the three bridge arms of the first power module 200 is first controlled to be turned on to replace the function of the first switch module 300, and then the first switch module 300 is controlled to connect the power input terminal 400 to the first DC terminal 210, and the three-phase winding is switched to an open winding connection method. Finally, PWM control technology is used to output a PWM control signal to the first power module 200. The switching process is simple and convenient.

[0164] Reference Figure 15 , Figure 15 The schematic diagram of the switching status of each power module and switch module in the working state and transition state of the drive control circuit is given:

[0165] Working state 1: Before time t1, the drive control circuit is in working state 1, that is, point a of the first switch module 300 is connected to point b, point a of the second switch module 700 is connected to point c, the first power module 200 is operating in state 1, and the second power module 500 is operating in state 2;

[0166] Transition State 1: It is necessary to switch from working state 1 to working state 2. At time t1, the second power module 500 switches from state 2 to state 3. Then, at time t2, the second switch module 700 switches from point a connected to point c to point a connected to point b. At time t3, the second power module 500 switches from state 3 to state 1. It can be understood that when it is necessary to switch from working state 2 to working state 1, the switching process is the reverse process of transition state 1, which will not be repeated here.

[0167] Working state 2: Between time t3 and time t4, the drive control circuit operates in working state 2, that is, point a of the first switch module 300 is connected to point b, point a of the second switch module 700 is connected to point b, the first power module 200 operates in state 1, and the second power module 500 operates in state 1;

[0168] Transition State 2: It is necessary to switch from working state 2 to working state 3. At time t4, the first power module 200 switches from state 1 to state 3. Then, at time t5, the first switch module 300 switches from point a connected to point b to point a connected to point c. At time t6, the first power module 200 switches from state 3 to state 2. It can be understood that when it is necessary to switch from working state 3 to working state 2, the switching process is the reverse process of transition state 2, which will not be repeated here.

[0169] Working state 3: Between time t6 and time t7, the drive control circuit operates in working state 3, that is, point a of the first switch module 300 is connected to point c, point a of the second switch module 700 is connected to point b, the first power module 200 operates in state 2, and the second power module 500 operates in state 1;

[0170] Transition state 3: It is necessary to switch from working state 3 to working state 1. At time t7, the first power module 200 switches from state 2 to state 3; then at time t8, the first switch module 300 switches from point a to point c to point a to point b; at time t9, the first power module 200 switches from state 3 to state 1 and the second power module 500 switches from state 1 to state 3; at time t10, the second switch module 700 switches from point a to point b to point a to point c; at time t11, the second power module 500 switches from state 3 to state 2; it can be understood that when it is necessary to switch from working state 1 to working state 3, the switching process is the inverse process of transition state 3, which will not be repeated here.

[0171] In a third aspect, an embodiment of the present invention provides a circuit board comprising a drive control circuit according to an embodiment of the first aspect of the present invention.

[0172] According to the circuit board provided in an embodiment of the present invention, the drive control circuit configures the first switch module 300 to connect the power input terminal 400 to the first power module 200 or short-circuit the first DC terminal 210 of the first power module 200, and configures the second switch module 700 to connect the energy storage device 600 to the second power module 500 or short-circuit the second DC terminal 510 of the second power module 500, so that the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, and the three-phase winding is in star connection operation; under high load state, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500. The power module 500 is configured so that the three-phase winding is in an open-winding connection mode. In an emergency state where the power input terminal 400 suddenly loses power, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500. The three-phase winding is in a star connection mode and obtains power from the energy storage device 600. When the open-winding motor 100 requires emergency braking, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500 to cut off all power to the open-winding motor 100. In addition, the control module is configured to output control signals to the first power module 200 and the second power module 500 according to the states of the first switch module 300 and the second switch module 700, so that the drive control circuit can operate reliably and efficiently under various working conditions.

[0173] In a fourth aspect, an embodiment of the present invention provides an air conditioner, comprising the circuit board according to the embodiment of the third aspect of the present invention;

[0174] or,

[0175] It includes at least one processor and a memory for communicating with the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the drive control method as the embodiment of the second aspect of the present invention.

[0176] According to the air conditioner provided by the embodiment of the present invention, the drive control circuit configures the first switch module 300 to connect the power input terminal 400 to the first power module 200 or short-circuit the first DC terminal 210 of the first power module 200, and configures the second switch module 700 to connect the energy storage device 600 to the second power module 500 or short-circuit the second DC terminal 510 of the second power module 500, so that the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, and the three-phase winding is in star connection operation; under high load state, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in open winding connection operation; the power input In an emergency state where the input end 400 suddenly loses power, the first switch module 300 can short-circuit the first DC end 210 of the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in star connection operation and obtains electrical energy from the energy storage device 600; when the open-winding motor 100 needs emergency braking, the first switch module 300 can short-circuit the first DC end 210 of the first power module 200 and the second switch module 700 can short-circuit the second DC end 510 of the second power module 500, thereby cutting off all power supply to the open-winding motor 100; therefore, the drive control method can control the connection state of the first switch module 300 and the second switch module 700 to enable the drive control circuit to operate in different working states, and output control signals to the first power module 200 and the second power module 500 according to the state of the first switch module 300 and the second switch module 700, so that the drive control circuit can operate reliably and efficiently under various working states.

[0177] In a fifth aspect, an embodiment of the present invention provides a computer storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the drive control method of the embodiment of the second aspect of the present invention.

[0178] According to the computer storage medium provided by an embodiment of the present invention, the drive control circuit configures the first switch module 300 to connect the power input terminal 400 to the first power module 200 or short-circuit the first DC terminal 210 of the first power module 200, and configures the second switch module 700 to connect the energy storage device 600 to the second power module 500 or short-circuit the second DC terminal 510 of the second power module 500, so that the drive control circuit has multiple working states to be suitable for different scenarios. For example, under normal load, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, and the three-phase winding is in a star connection operation; under high load state, the first switch module 300 can connect the power input terminal 400 to the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in an open winding connection operation; In an emergency state where the source input terminal 400 suddenly loses power, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can connect the energy storage device 600 to the second power module 500, and the three-phase winding is in star connection operation and obtains electrical energy from the energy storage device 600; when the open-winding motor 100 needs emergency braking, the first switch module 300 can short-circuit the first DC terminal 210 of the first power module 200 and the second switch module 700 can short-circuit the second DC terminal 510 of the second power module 500, thereby cutting off all power supply to the open-winding motor 100; therefore, the drive control method can control the connection status of the first switch module 300 and the second switch module 700 to enable the drive control circuit to operate in different working states, and output control signals to the first power module 200 and the second power module 500 according to the status of the first switch module 300 and the second switch module 700, so that the drive control circuit can operate reliably and efficiently under various working states.

[0179] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer-readable media, which can include computer storage media or non-transitory media and communication media or transient media. As is well known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0180] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of each phase winding forms a first three-phase outgoing wire group, and the other end of each phase winding forms a second three-phase outgoing wire group, characterized in that: include: a first power module, the first power module comprising a first DC terminal and a first AC terminal, the first AC terminal being connected to the first three-phase outgoing line group; a first switch module, configured to connect the power input terminal to the first DC terminal or short-circuit the first DC terminal; a second power module, the second power module comprising a second DC terminal and a second AC terminal, the second AC terminal being connected to the second three-phase outgoing line group; Energy storage devices; a second switch module, configured to connect the energy storage device to the second DC terminal or short-circuit the second DC terminal; a control module, configured to output a control signal to the first power module and the second power module according to states of the first switch module and the second switch module; in: When the first switch module connects the power input terminal to the first DC terminal and the second switch module shorts the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes: Outputting a PWM control signal to the first power module using PWM control technology; The second power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module.

2. A drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of each phase winding constitutes a first three-phase outgoing wire group, and the other end of each phase winding constitutes a second three-phase outgoing wire group, characterized in that: include: a first power module, the first power module comprising a first DC terminal and a first AC terminal, the first AC terminal being connected to the first three-phase outgoing line group; a first switch module, configured to connect the power input terminal to the first DC terminal or short-circuit the first DC terminal; a second power module, the second power module comprising a second DC terminal and a second AC terminal, the second AC terminal being connected to the second three-phase outgoing line group; Energy storage devices; a second switch module, configured to connect the energy storage device to the second DC terminal or short-circuit the second DC terminal; a control module, configured to output a control signal to the first power module and the second power module according to states of the first switch module and the second switch module; in: When the first switch module shorts the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes: Outputting a PWM control signal to the second power module using PWM control technology; The first power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module.

3. The drive control circuit according to claim 1 or 2, characterized in that: It also includes a rectifier module, the input end of the rectifier module is connected to the power input end, and the output end of the rectifier module is connected to the first switch module.

4. The drive control circuit according to claim 3, characterized in that: It also includes a first capacitor, which is connected in parallel between the output end of the rectifier module and the first switch module.

5. A drive control method, characterized in that: Applicable to a drive control circuit including a first switch module, a first power module, a second power module, a second switch module, and an energy storage device, the drive control circuit being used to drive an open-winding motor having a three-phase winding, wherein one end of the winding of each phase constitutes a first three-phase outgoing line group, and the other end of the winding of each phase constitutes a second three-phase outgoing line group, the first power module includes a first DC terminal and a first AC terminal, the first AC terminal is connected to the first three-phase outgoing line group, the first switch module is respectively connected to a power input terminal and the first DC terminal, the second power module includes a second DC terminal and a second AC terminal, the second AC terminal is connected to the second three-phase outgoing line group, and the second switch module is respectively connected to the energy storage device and the second DC terminal, the method comprising: Controlling the first switch module to connect the power input terminal to the first DC terminal or to short-circuit the first DC terminal; controlling the second switch module to connect the energy storage device to the second DC terminal or to short-circuit the second DC terminal; outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module; in: When the first switch module connects the power input terminal to the first DC terminal and the second switch module shorts the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes: Outputting a PWM control signal to the first power module using PWM control technology; The second power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module.

6. A drive control method, characterized in that: Applicable to a drive control circuit including a first switch module, a first power module, a second power module, a second switch module, and an energy storage device, the drive control circuit being used to drive an open-winding motor having a three-phase winding, wherein one end of the winding of each phase constitutes a first three-phase outgoing line group, and the other end of the winding of each phase constitutes a second three-phase outgoing line group, the first power module includes a first DC terminal and a first AC terminal, the first AC terminal is connected to the first three-phase outgoing line group, the first switch module is respectively connected to a power input terminal and the first DC terminal, the second power module includes a second DC terminal and a second AC terminal, the second AC terminal is connected to the second three-phase outgoing line group, and the second switch module is respectively connected to the energy storage device and the second DC terminal, the method comprising: Controlling the first switch module to connect the power input terminal to the first DC terminal or to short-circuit the first DC terminal; controlling the second switch module to connect the energy storage device to the second DC terminal or to short-circuit the second DC terminal; outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module; in: When the first switch module shorts the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes: Outputting a PWM control signal to the second power module using PWM control technology; The first power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module.

7. The drive control method according to claim 5 or 6, characterized in that: When the first switch module connects the power input terminal to the first DC terminal and the second switch module connects the energy storage device to the second DC terminal, outputting a control signal to the first power module and the second power module according to the states of the first switch module and the second switch module includes: A PWM control technology is used to output a PWM control signal to the first power module and the second power module.

8. The driving control method according to claim 5, characterized in that: The following steps are also included: Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the second power module to be turned on; controlling the second switch module to connect the energy storage device to the second DC terminal; A PWM control technology is used to output a PWM control signal to the second power module.

9. The driving control method according to claim 7, characterized in that: The following steps are also included: Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the second power module to be turned on; Controlling the second switch module to short-circuit the second DC terminal; The second power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the second power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the second power module.

10. The driving control method according to claim 7, wherein: The following steps are also included: Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the first power module to be turned on; Controlling the first switch module to short-circuit the first DC terminal; The first power module is controlled according to the current flow direction of the three-phase winding, so that the current flowing from the first power module to the three-phase winding is alternately converged at the positive bus and the negative bus of the first power module.

11. The driving control method according to claim 6, characterized in that: The following steps are also included: Controlling the upper switch tubes or the lower switch tubes of the three bridge arms of the first power module to be turned on; Controlling the first switch module to connect the power input terminal to the first DC terminal; A PWM control technology is used to output a PWM control signal to the first power module.

12. A circuit board, characterized in that: The drive control circuit comprises the drive control circuit according to any one of claims 1 to 4.

13. An air conditioner, characterized in that: comprising the circuit board as claimed in claim 12; or, comprising at least one processor and a memory for communicatively coupling with the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the drive control method according to any one of claims 5 to 11.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the drive control method according to any one of claims 5 to 11.

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