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 drive circuit, a switch component and a first detection circuit. By setting the first detection circuit, even if the drive circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the continuous rotation of the rotor of the motor due to inertia. Then, the position information of the rotor of the motor during the switching process of the connection state of the three-phase windings can be determined according to the back electromotive force voltage. After the subsequent three-phase windings complete the switching of the connection state, it is convenient to make the drive circuit output a drive voltage corresponding to the phase according to the position information of the rotor, so as to realize the switching of the connection state of the three-phase windings while the motor keeps running.

Description

Technical Field

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

[0002] Most of the variable-frequency compressors of existing variable-frequency air conditioners use permanent magnet motors as drive motors. Affected by the operating requirements of variable-frequency air conditioners, the three-phase windings of permanent magnet motors usually need to be switched between star connection and delta connection. When using the existing scheme to switch the connection state, the permanent magnet motor needs to be powered off and stopped, thus affecting the operation of the compressor. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, embodiments of the present invention provide a drive control circuit, a drive control method, a circuit board, an air conditioner, and a storage medium, which can switch the connection state of the three-phase windings while the motor is running.

[0004] In a first aspect, an embodiment of the present invention provides a drive control circuit for driving a motor having a rotor and three-phase windings. One end of each winding forms a first three-phase output line group, and the other end of each winding forms a second three-phase output line group. The drive control circuit includes:

[0005] A drive circuit connected to the second three-phase output line group for providing a drive voltage to the three-phase windings;

[0006] A switch assembly including a first switch group and a second switch group. The first switch group is connected to the first three-phase output line group, and the second switch group is respectively connected to the first three-phase output line group and the second three-phase output line group. When the first switch group is closed and the second switch group is open, the three-phase windings are switched to star connection. When the first switch group is open and the second switch group is closed, the three-phase windings are switched to delta connection;

[0007] A first detection circuit connected to the second three-phase output line group for detecting the back electromotive force voltage generated during the switching process of the connection state of the three-phase windings of the motor. The back electromotive force voltage is used to determine the position information of the rotor during the switching process of the connection state of the three-phase windings.

[0008] The driving control circuit provided by the embodiment of the present invention has at least the following beneficial effects: by setting the first detection circuit, even if the driving circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the rotation of the rotor of the motor due to inertia. Then, the position information of the rotor of the motor during the switching process of the connection state of the three-phase windings can be determined according to the back electromotive force voltage. After the subsequent three-phase windings complete the switching of the connection state, it is convenient to make the driving circuit output the driving voltage of the corresponding phase according to the position information of the rotor, so as to realize the switching of the connection state of the three-phase windings while the motor keeps running.

[0009] In some embodiments of the present invention, the back electromotive force voltage is used to determine the rotation speed of the rotor during the switching process of the connection state of the three-phase windings, and the rotation speed is used to determine the position information of the rotor during the switching process of the connection state of the three-phase windings.

[0010] In the above technical solution, the rotation speed of the rotor is first obtained by using the back electromotive force voltage, and then the position information of the rotor is obtained by using the rotation speed of the rotor.

[0011] In some embodiments of the present invention, the driving control circuit further includes:

[0012] A second detection circuit for detecting the phase current output when the driving circuit provides a driving voltage to the three-phase windings. The phase current is used to determine the position information of the rotor when the three-phase windings are in the star connection or the delta connection state. The second detection circuit is connected to the second three-phase output wire group.

[0013] In the above technical solution, by setting the second detection circuit, when the motor is running normally, that is, when the driving circuit provides a driving voltage to the three-phase windings, the phase current of the three-phase windings can be detected by the second detection circuit, and then the position information of the rotor of the motor can be determined according to the phase current. It is convenient to make the driving circuit output the driving voltage of the corresponding phase according to the position information, so as to realize the closed-loop control of the motor and ensure the stable and efficient operation of the motor.

[0014] In some embodiments of the present invention, the first switch group includes a first switch and a second switch. The first three-phase output wire group includes a first pin, a second pin, and a third pin. The first switch is respectively connected to the first pin and the second pin, and the second switch is respectively connected to the second pin and the third pin.

[0015] In the above technical solution, the first switch group includes a first switch and a second switch. When the first switch and the second switch are both closed and the second switch group is in the open state, at this time, the first pin, the second pin, and the third pin are connected to each other, so that the three-phase windings are in the star connection state.

[0016] In some embodiments of the present invention, the first switch group includes a first switch, a second switch, and a third switch, the first three-phase output line group includes a first pin, a second pin, and a third pin, one ends of the first switch, the second switch, and the third switch are connected to each other, and the other ends of the first switch, the second switch, and the third switch are respectively connected to the first pin, the second pin, and the third pin.

[0017] In the above technical solution, the first switch group includes a first switch, a second switch, and a third switch. When the first switch, the second switch, and the third switch are closed simultaneously and the second switch group is in an open state, at this time, the first pin, the second pin, and the third pin are connected to each other, so that the three-phase winding is in a star connection state.

[0018] In some embodiments of the present invention, the second switch group includes a fourth switch, a fifth switch, and a sixth switch, the first three-phase output line group includes a first pin, a second pin, and a third pin, the second three-phase output line group includes a fourth pin, a fifth pin, and a sixth pin, the fourth switch is respectively connected to the second pin and the sixth pin, the fifth switch is respectively connected to the third pin and the fifth pin, and the sixth switch is respectively connected to the first pin and the fourth pin.

[0019] In the above technical solution, the second switch group includes a fourth switch, a fifth switch, and a sixth switch. When the fourth switch, the fifth switch, and the sixth switch are closed simultaneously and the first switch group is in an open state, at this time, the second pin and the sixth pin are connected to each other, the third pin and the fifth pin are connected to each other, and the first pin and the fourth pin are connected to each other, so that the three-phase winding is in a triangular connection.

[0020] In some embodiments of the present invention, the back electromotive force voltage includes a first voltage, a second voltage, and a third voltage; the first detection circuit includes a first detection end for detecting the first voltage output from the sixth pin, a second detection end for detecting the second voltage output from the fifth pin, and a third detection end for detecting the third voltage output from the fourth pin, the first detection end is connected to the sixth pin, the second detection end is connected to the fifth pin, and the third detection end is connected to the fourth pin.

[0021] In the above technical solution, the first detection circuit includes a first detection end, a second detection end, and a third detection end, and can respectively detect the back electromotive force voltages of the fourth pin, the fifth pin, and the sixth pin of the second three-phase output line group, which is beneficial to ensuring the accuracy of detection.

[0022] In some embodiments of the present invention, the back electromotive force voltage includes a first voltage, a second voltage, and a third voltage; the first detection circuit includes a first detection end and a second detection end for detecting the back electromotive force voltage output from any two of the sixth pin, the fifth pin, and the fourth pin. The first detection end detects the first voltage, the second detection end detects the second voltage, the third voltage is obtained based on the first voltage and the second voltage, and the first detection end and the second detection end are respectively connected to any two of the sixth pin, the fifth pin, and the fourth pin.

[0023] In the above technical solution, the first detection circuit includes a first detection end and a second detection end, which can respectively detect the back electromotive force voltage of any two of the fourth pin, the fifth pin, and the sixth pin of the second three-phase output line group, and then the back electromotive force voltage of the remaining pin can be obtained according to the back electromotive force voltage of the any two pins, which is beneficial to simplifying the structure of the first detection circuit.

[0024] In some embodiments of the present invention, the driving circuit includes a first bridge arm, a second bridge arm, and a third bridge arm connected in parallel with each other. The first bridge arm, the second bridge arm, and the third bridge arm each include two series-connected power switching tubes, and a diode is anti-parallelly connected to the power switching tube.

[0025] In the above technical solution, the first bridge arm, the second bridge arm, and the third bridge arm form a three-phase bridge structure. By controlling the on-off states of the six power switching tubes, the driving circuit can output a driving voltage matching the current phase of the motor.

[0026] In some embodiments of the present invention, a power supply component is further included, and the power supply component is connected to the driving circuit.

[0027] In the above technical solution, by setting the power supply component, an input voltage can be provided for the driving circuit to realize driving the motor to operate.

[0028] In a second aspect, an embodiment of the present invention further provides a driving control method, which is applied to a driving control circuit. The driving control circuit is used to drive a motor having a rotor and a three-phase winding. One end of each phase of the winding forms a first three-phase output line group, and the other end of each phase of the winding forms a second three-phase output line group. The driving control circuit includes:

[0029] A driving circuit connected to the second three-phase output line group;

[0030] The switch assembly includes a first switch group and a second switch group. The first switch group is connected to the first three-phase output line group, and the second switch group is respectively connected to the first three-phase output line group and the second three-phase output line group. When the first switch group is closed and the second switch group is open, the three-phase windings are switched to star connection; when the first switch group is open and the second switch group is closed, the three-phase windings are switched to delta connection;

[0031] The first detection circuit is connected to the second three-phase output line group;

[0032] The drive control method includes:

[0033] Controlling the drive circuit to stop working, and controlling the opening and closing of the switch assembly to switch the connection state of the three-phase windings;

[0034] Obtaining, through the first detection circuit, the back electromotive force voltage generated by the motor during the switching process of the connection state of the three-phase windings;

[0035] Determining the position information of the rotor during the switching process of the connection state of the three-phase windings according to the back electromotive force voltage;

[0036] According to the position information of the rotor during the switching process of the connection state of the three-phase windings, controlling the drive circuit to provide a drive voltage with a corresponding phase to the three-phase windings that have completed the connection state switching.

[0037] The drive control method provided by the embodiments of the present invention has at least the following beneficial effects: Even when the drive circuit stops working during the process of switching the connection state of the three-phase windings, it is possible to use the first detection circuit to detect the back electromotive force voltage generated by the inertia of the rotor of the motor continuing to rotate. Then, the position information of the rotor of the motor during the switching process of the connection state of the three-phase windings can be determined according to the back electromotive force voltage. After the connection state of the three-phase windings is switched, according to the position information of the rotor, the drive circuit outputs a drive voltage with a corresponding phase, realizing the switching of the connection state of the three-phase windings while the motor remains in operation.

[0038] In some embodiments of the present invention, the drive control circuit further includes a second detection circuit, the second detection circuit is connected to the second three-phase output line group, and the drive control method further includes:

[0039] Obtaining, through the second detection circuit, the phase current output when the drive circuit provides a drive voltage to the three-phase windings;

[0040] Determining the position information of the rotor when the three-phase windings are in the star connection or the delta connection state according to the phase current;

[0041] According to the position information of the rotor when the three-phase windings are in the star connection or the delta connection state, control the drive circuit to supply a drive voltage with a corresponding phase to the three-phase windings.

[0042] In the above technical solution, when the motor is running normally, that is, when the drive circuit supplies a drive voltage to the three-phase windings, the phase current of the three-phase windings can be detected by the second detection circuit, and then the position information of the rotor of the motor can be determined according to the phase current, which is convenient to make the drive circuit output a drive voltage with a corresponding phase according to the position information, realize the closed-loop control of the motor, and ensure the stable and efficient operation of the motor.

[0043] In some embodiments of the present invention, during the process of switching the connection state of the three-phase windings, the position information of the rotor is obtained according to the back electromotive force voltage;

[0044] After the switching of the connection state of the three-phase windings is completed, the position information of the rotor is obtained according to the phase current.

[0045] In the above technical solution, during the process of switching the connection state of the three-phase windings, since the motor is powered off and there is no phase current, the position information of the rotor is obtained according to the back electromotive force voltage; when the switching of the connection state of the three-phase windings is completed, the motor runs normally, so the position information of the rotor is directly obtained according to the phase current. Therefore, the data detected by the first detection circuit and the second detection circuit can be selected according to the state of the three-phase windings.

[0046] In some embodiments of the present invention, the second three-phase output wire group includes a fourth pin, a fifth pin and a sixth pin, the first detection circuit includes a first detection end, a second detection end and a third detection end, the first detection end is connected to the sixth pin, the second detection end is connected to the fifth pin, the third detection end is connected to the fourth pin, and obtaining the back electromotive force voltage generated by the motor during the process of switching the connection state of the three-phase windings through the first detection circuit includes:

[0047] Obtain a first voltage detected by the first detection end, a second voltage detected by the second detection end and a third voltage detected by the third detection end.

[0048] In the above technical solution, by respectively detecting and obtaining the back electromotive force voltages of the fourth pin, the fifth pin and the sixth pin of the second three-phase output wire group, it is beneficial to ensure the accuracy of detection.

[0049] In some embodiments of the present invention, the second three-phase output line group includes a fourth pin, a fifth pin, and a sixth pin. The first detection circuit includes a first detection end and a second detection end. The first detection end and the second detection end are respectively connected to any two of the sixth pin, the fifth pin, and the fourth pin. Obtaining the back electromotive force voltage generated during the switching process of the connection state of the motor in the three-phase winding by the first detection circuit includes:

[0050] Obtain a first voltage detected by the first detection end and a second voltage detected by the second detection end.

[0051] In the above technical solution, by detecting and obtaining the back electromotive force voltages of any two of the fourth pin, the fifth pin, and the sixth pin of the second three-phase output line group, and then obtaining the back electromotive force voltage of the remaining pin according to the back electromotive force voltages of any two pins, it is beneficial to simplify the structure of the first detection circuit.

[0052] In some embodiments of the present invention, determining the position information of the rotor during the switching process of the connection state of the three-phase winding according to the back electromotive force voltage includes:

[0053] Obtain the rotational speed of the rotor according to the back electromotive force voltage;

[0054] Obtain the displacement of the rotor according to the integral of the rotational speed of the motor;

[0055] Determine the position information of the rotor according to the displacement of the rotor.

[0056] In the above technical solution, the rotational speed of the rotor is obtained according to the back electromotive force voltage, and then the displacement of the rotor during the period when the drive circuit stops working can be obtained by using the integral of the rotational speed of the rotor. Since the phase of the motor is known when the drive circuit is controlled to stop working, the position information of the rotor after the switching of the connection state of the three-phase winding is completed can be determined according to the displacement of the rotor during the period when the drive circuit stops working.

[0057] In some embodiments of the present invention, obtaining the rotational speed of the rotor according to the back electromotive force voltage includes:

[0058] Convert the back electromotive force voltage into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system;

[0059] Obtain the back electromotive force amplitude according to the first voltage vector and the second voltage vector;

[0060] Obtain the rotational speed of the rotor according to the back electromotive force amplitude.

[0061] In the above technical solution, the back electromotive force voltage is first converted, and then the back electromotive force amplitude is obtained according to the first voltage vector and the second voltage vector. Finally, the rotational speed of the rotor is obtained according to the back electromotive force amplitude. Converting the back electromotive force voltage to the two-phase stationary coordinate system can greatly simplify the subsequent analysis.

[0062] In a third aspect, an embodiment of the present invention further provides a circuit board, including the drive control circuit described in the first aspect.

[0063] Therefore, by providing the first detection circuit in the above circuit board, even if the drive circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the rotor of the motor continuing to rotate due to inertia. Then, the position information of the rotor of the motor during the process of switching the connection state of the three-phase windings can be determined according to the back electromotive force voltage. After the subsequent three-phase windings complete the connection state switching, it is convenient to make the drive circuit output the drive voltage corresponding to the phase according to the position information of the rotor, so as to realize switching the connection state of the three-phase windings while the motor keeps running.

[0064] In a fourth aspect, an embodiment of the present invention further provides an air conditioner, including the circuit board described in the third aspect.

[0065] Or,

[0066] It includes at least one processor and a memory for communicatively connecting 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 described in the second aspect.

[0067] Therefore, by providing the first detection circuit in the above air conditioner, even if the drive circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the rotor of the motor continuing to rotate due to inertia. Then, the position information of the rotor of the motor during the process of switching the connection state of the three-phase windings can be determined according to the back electromotive force voltage. After the subsequent three-phase windings complete the connection state switching, it is convenient to make the drive circuit output the drive voltage corresponding to the phase according to the position information of the rotor, so as to realize switching the connection state of the three-phase windings while the motor keeps running, which is beneficial to improving the temperature stability of the air conditioner.

[0068] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions for causing a computer to execute the drive control method described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0070] Figure 1 Schematic circuit diagram of a drive control circuit provided for an embodiment of the present invention;

[0071] Figure 2 Schematic circuit diagram of a drive control circuit provided for another embodiment of the present invention;

[0072] Figure 3 Schematic circuit diagram of a drive control circuit provided for another embodiment of the present invention;

[0073] Figure 4 Schematic structural diagram of a drive circuit provided for an embodiment of the present invention;

[0074] Figure 5 Flowchart of a drive control method provided for an embodiment of the present invention;

[0075] Figure 6 Flowchart of obtaining the back electromotive force voltage generated during the switching process of the connection state of the motor in the three-phase windings through the first detection circuit provided for an embodiment of the present invention;

[0076] Figure 7 Flowchart of obtaining the back electromotive force voltage generated during the switching process of the connection state of the motor in the three-phase windings through the first detection circuit provided for another embodiment of the present invention;

[0077] Figure 8 Flowchart of determining the position information of the rotor during the switching process of the connection state of the three-phase windings according to the back electromotive force voltage provided for an embodiment of the present invention;

[0078] Figure 9 Flowchart of obtaining the rotational speed of the rotor according to the back electromotive force voltage provided for an embodiment of the present invention;

[0079] Figure 10 Flowchart of supplementary steps of a drive control method provided for an embodiment of the present invention;

[0080] Figure 11 Brief schematic diagram of a rotor position information conversion model provided for an embodiment of the present invention;

[0081] Figure 12 Brief schematic diagram of the structure of a circuit board provided for an embodiment of the present invention;

[0082] Figure 13 Brief schematic diagram of the structure of an air conditioner provided for an embodiment of the present invention;

[0083] Figure 14 Brief schematic diagram of the structure of an air conditioner provided by another embodiment of the present invention. Detailed implementation manners

[0084] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0085] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0086] In the description of the present invention, the meaning of "at least two" is one or more, the meaning of "a plurality" is at least two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0087] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0088] Most variable-frequency compressors of existing variable-frequency air conditioners use permanent magnet motors as drive motors. Affected by the operating requirements of variable-frequency air conditioners, the three-phase windings of permanent magnet motors usually need to be switched between star connection and delta connection. When using existing solutions to switch the connection state, the permanent magnet motor needs to be powered off and stop running, thus affecting the operation of the compressor.

[0089] Based on this, the embodiments of the present invention provide a drive control circuit, a drive control method, a circuit board, an air conditioner and a storage medium, which can realize the non-stop switching of the connection state of the three-phase windings of the motor without affecting the normal operation of the compressor.

[0090] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0091] Refer to Figure 1, an embodiment of the present invention provides a drive control circuit for driving a motor having a rotor and three-phase windings 100. One end of each phase winding forms a first three-phase output group 101, and the other end of each phase winding forms a second three-phase output group 102. The drive control circuit includes a drive circuit 110 for supplying a drive voltage to the three-phase windings 100, a switch component 120, a first detection circuit 130 for detecting the back electromotive force voltage generated during the switching process of the connection state of the motor in the three-phase windings 100, and a second detection circuit 140 for detecting the phase current output when the drive circuit 110 supplies a drive voltage to the three-phase windings 100. The drive circuit 110 is connected to the second three-phase output group 102; the switch component 120 includes a first switch group 121 and a second switch group 122. The first switch group 121 is connected to the first three-phase output group 101, and the second switch group 122 is respectively connected to the first three-phase output group 101 and the second three-phase output group 102. When the first switch group 121 is closed and the second switch group 122 is opened, the three-phase windings 100 are switched to the star connection. When the first switch group 121 is opened and the second switch group 122 is closed, the three-phase windings 100 are switched to the delta connection; the first detection circuit 130 is connected to the second three-phase output group 102, and the second detection circuit 140 is connected to the second three-phase output group 102.

[0092] Among them, first, the speed of the rotor during the switching process of the connection state of the three-phase windings 100 is determined by the back electromotive force voltage, and then the position information of the rotor during the switching process of the connection state of the three-phase windings 100 is determined according to the speed.

[0093] In one embodiment, the three-phase windings 100 include three-phase windings. The pins of the first-phase winding, the second-phase winding, and the third-phase winding are led out of the motor. The two ends of the first-phase winding are respectively led out as the first pin M1 and the sixth pin M6. The two ends of the second-phase winding are respectively led out as the second pin M2 and the fifth pin M5. The two ends of the third-phase winding are respectively led out as the third pin M3 and the fourth pin M4. Based on this, the first three-phase output group 101 includes the first pin M1, the second pin M2, and the third pin M3, and the second three-phase output group 102 includes the fourth pin M4, the fifth pin M5, and the sixth pin M6.

[0094] The drive circuit 110 supplies a drive voltage to the three-phase windings 100 to make the motor operate. During the operation of the motor, the three-phase windings are in the star connection or delta connection state. It is necessary to perform closed-loop control on the motor through the position information of the rotor. Therefore, the phase current of the three-phase windings 100 is detected by the second detection circuit 140, and then the position information of the rotor of the motor in the star connection or delta connection state of the three-phase windings (that is, when the motor is operating normally) is determined according to the phase current, so as to facilitate the drive circuit 110 to output a drive voltage corresponding to the phase according to the position information, realize the closed-loop control of the motor, and ensure the stable and efficient operation of the motor.

[0095] Exemplarily, the second detection circuit 140 includes a fourth detection terminal I1, a fifth detection terminal I2, and a sixth detection terminal I3. The fourth detection terminal I1 is connected to the sixth pin M6, the fifth detection terminal I2 is connected to the fifth pin M5, and the sixth detection terminal I3 is connected to the fourth pin M4. Based on this, the first current is detected by the fourth detection terminal I1, the second current is detected by the fifth detection terminal I2, and the third current is detected by the sixth detection terminal I3. The phase currents of the three-phase winding 100 detected by the second detection circuit 140 include the above-mentioned first current, second current, and third current. After obtaining the phase currents of the three-phase winding 100, Clarke transformation is performed, and the position and speed can be estimated based on the data after Clarke transformation, so as to obtain the position information of the rotor when the three-phase winding is in the star connection or delta connection state. According to this position information, the drive circuit 110 can be controlled to output the drive voltage with the corresponding phase to the three-phase winding 100 through the inverse Park transformation, SVPWM, etc.

[0096] In an embodiment, the first switch group 121 includes a first switch K1 and a second switch K2, and the second switch group 122 includes a fourth switch K4, a fifth switch K5, and a sixth switch K6. The first switch K1 is respectively connected to the first pin M1 and the second pin M2, the second switch K2 is respectively connected to the second pin M2 and the third pin M3, the fourth switch K4 is respectively connected to the second pin M2 and the sixth pin M6, the fifth switch K5 is respectively connected to the third pin M3 and the fifth pin M5, and the sixth switch K6 is respectively connected to the first pin M1 and the fourth pin M4.

[0097] When the first switch K1 and the second switch K2 are closed simultaneously, and the second switch group 122 is in the off state, at this time, the first pin M1, the second pin M2, and the third pin M3 are connected to each other, so that the three-phase winding 100 is in the star connection state; when the fourth switch K4, the fifth switch K5, and the sixth switch K6 are closed simultaneously, and the first switch group 121 is in the off state, at this time, the second pin M2 and the sixth pin M6 are connected to each other, the third pin M3 and the fifth pin M5 are connected to each other, and the first pin M1 and the fourth pin M4 are connected to each other, so that the three-phase winding 100 is in the delta connection.

[0098] Refer to Figure 2, in one embodiment, the first switch group 121 may also include a first switch K1, a second switch K2, and a third switch K3. One ends of the first switch K1, the second switch K2, and the third switch K3 are connected to each other. The other ends of the first switch K1, the second switch K2, and the third switch K3 are respectively connected to a first pin M1, a second pin M2, and a third pin M3. When the first switch K1, the second switch K2, and the third switch K3 are closed simultaneously and the second switch group 122 is in an open state, at this time, the first pin M1, the second pin M2, and the third pin M3 are connected to each other, and the three-phase winding 100 can also be in a star connection state.

[0099] In one embodiment, the above-mentioned first switch K1, second switch K2, third switch K3, fourth switch K4, fifth switch K5, and sixth switch K6 may adopt switching tubes. Alternatively, they can also be selected from electromagnetic relays, solid-state relays, contactors, or electronic switches, thus having the advantages of stable switching and low cost. In one embodiment, the above-mentioned first switch K1, second switch K2, third switch K3, fourth switch K4, fifth switch K5, and sixth switch K6 are all single-pole single-throw relays. It should be added that if an electronic switch is selected, its on-resistance does not exceed 1 ohm.

[0100] Generally speaking, it is necessary to switch the three-phase winding 100 between star connection and delta connection according to the operating requirements of the motor. However, when the connection state of the three-phase winding 100 is switched, the drive circuit 110 needs to stop working. At this time, it is impossible to detect the phase current output by the drive circuit 110 through the second detection circuit 140 to determine the position information of the rotor. Even when the drive circuit 110 stops working, the rotor of the motor will still continue to rotate due to inertia at this time, and the three-phase winding 100 will supply power outward, and the motor generates a back electromotive force voltage. Therefore, the position information of the rotor during the switching process of the three-phase winding connection state can be detected by the first detection circuit 130 detecting this back electromotive force voltage.

[0101] In one embodiment, the first detection circuit 130 includes a first detection terminal V1, a second detection terminal V2, and a third detection terminal V3. The first detection terminal V1 is connected to the sixth pin M6, the second detection terminal V2 is connected to the fifth pin M5, and the third detection terminal V3 is connected to the fourth pin M4. Therefore, the first detection terminal V1 can detect the first voltage output by the sixth pin M6, the second detection terminal V2 can detect the second voltage output by the fifth pin M5, and the third detection terminal V3 can detect the third voltage output by the fourth pin M4. Based on this, the back electromotive force voltage output by the second three-phase outgoing line group 102 includes the first voltage, the second voltage, and the third voltage. By setting the first detection terminal V1, the second detection terminal V2, and the third detection terminal V3, the first detection circuit 130 can respectively detect the back electromotive force voltages of the fourth pin M4, the fifth pin M5, and the sixth pin M6 of the second three-phase outgoing line group 102, which is beneficial to ensuring the accuracy of detection.

[0102] In addition, in one embodiment, the first detection circuit 130 can also be provided with only the first detection terminal V1 and the second detection terminal V2. The first detection terminal V1 and the second detection terminal V2 are respectively connected to any two of the sixth pin M6, the fifth pin M5, and the fourth pin M4. Schematically, as Figure 3 shown, the first detection terminal V1 is connected to the sixth pin M6, and the second detection terminal V2 is connected to the fifth pin M5. Therefore, the first detection terminal V1 can detect the first voltage output by the sixth pin M6, and the second detection terminal V2 can detect the second voltage output by the fifth pin M5. Then, based on the first voltage and the second voltage, the third voltage output by the fourth pin M4 can be obtained. Exemplarily, the third voltage can be obtained from the first voltage and the second voltage according to Kirchhoff's voltage law. It can be understood that Figure 3 only one possible embodiment is shown. The first detection terminal V1 and the second detection terminal V2 can be respectively connected to any two of the sixth pin M6, the fifth pin M5, and the fourth pin M4, and then the back electromotive force voltage of the remaining pin can be obtained according to the detected back electromotive force voltages of the two pins. The first detection circuit 130 is provided with only the first detection terminal V1 and the second detection terminal V2, which is beneficial to simplifying the structure of the first detection circuit 130.

[0103] Exemplarily, the first detection circuit 130 can be a voltage sampling circuit or a voltage sensor, etc.; the second detection circuit 140 can be a current sampling circuit or a current sensor, etc. Correspondingly, when the first detection circuit 130 is a voltage sampling circuit, it is necessary to set a sampling resistor R as Figure 1 、 Figure 2 or Figure 3 shown.

[0104] After the first detection circuit 130 detects the back electromotive force voltage output by the second three-phase outgoing line group 102, the rotational speed of the rotor can be obtained based on this back electromotive force voltage. Exemplarily, the back electromotive force voltage can be first converted into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system. Among them, as an exemplary conversion method, the Clarke transformation can be used; then the back electromotive force amplitude Em is obtained according to the root mean square of the first voltage vector and the second voltage vector. Finally, using the back electromotive force amplitude Em, combined with the back electromotive force coefficient Ke and the number of pole pairs P in the motor parameters, the rotational speed of the rotor ωe = Em×(1000P / 60Ke) can be obtained.

[0105] Then, after obtaining the rotational speed of the rotor, by integrating the rotational speed of the rotor, the displacement of the rotor during the period when the drive circuit 110 stops working can be obtained, that is, the displacement of the rotor due to inertia after the drive circuit 110 stops working.

[0106] Since when controlling the drive circuit 110 to stop working, the phase of the motor is known (for example, it can be obtained according to the phase current detected by the second detection circuit 140), so when controlling the drive circuit 110 to stop working, the initial position information of the rotor is known. Therefore, according to the displacement of the rotor during the period when the drive circuit 110 stops working, the position information of the rotor when the connection state of the three-phase winding 100 is switched is determined. Therefore, after the connection state of the three-phase winding 100 is switched, it is convenient to output the drive voltage corresponding to the phase according to this position information, ensuring that the motor can operate normally after the connection state of the three-phase winding 100 is switched. Exemplarily, according to this position information, the drive circuit 110 can be controlled to output the drive voltage corresponding to the phase to the three-phase winding 100 through methods such as Park inverse transformation, SVPWM, etc.

[0107] Refer to Figure 4 , in an embodiment, the drive circuit 110 includes a first bridge arm 410, a second bridge arm 420, and a third bridge arm 430 that are connected in parallel with each other. The first bridge arm 410, the second bridge arm 420, and the third bridge arm 430 each include two power switch tubes Q connected in series, and a diode D is anti-parallelly connected to the power switch tube Q. The first bridge arm 410, the second bridge arm 420, and the third bridge arm 430 form a three-phase bridge structure. By controlling the on-off states of the six power switch tubes Q, the drive circuit 110 can output a drive voltage matching the current phase of the motor. Refer to Figure 1 , correspondingly, the three output terminals A1, B1, and C1 of the drive circuit 110 are respectively connected to the sixth pin M6, the fifth pin M5, and the fourth pin M4 of the three-phase winding 100.

[0108] Exemplarily, the power switching transistor Q of the drive circuit 110 can be a metal oxide semiconductor (MOS) device or an insulated gate bipolar transistor (IGBT) device. Among them, compared with the IGBT device, the MOS device has a smaller current and a lower conduction voltage drop under light load, so it has the advantage of high operating efficiency. The IGBT device, on the other hand, has the advantage of low cost.

[0109] In one embodiment, the drive control circuit further includes a power supply component 150, and the power supply component 150 is connected to the drive circuit 110. The power supply component 150 can provide an input voltage for the drive circuit 110 to realize the operation of the drive motor. In other embodiments, the power supply component 150 can also be arranged independently of the drive control circuit.

[0110] In one embodiment, the power supply component 150 includes an AC power supply and a rectification component for converting the AC power supply into a DC output. The AC power supply is connected to the rectification component, and the rectification component is connected to the drive circuit 110. By setting the rectification component, the AC power supply can be converted into a DC output to adapt to the input signal requirements of the drive circuit 110.

[0111] In one embodiment, the drive control circuit further includes a filtering component. By setting the filtering component, the interference signals of the power supply component 150 can be filtered out, and the stability of the power supply component 150 can be improved. In one embodiment, the filtering component includes an electrolytic capacitor C. The filtering component uses the electrolytic capacitor C, which has the advantages of simple structure and low cost.

[0112] In one embodiment, the control of the above drive circuit 110, switch component 120, first detection circuit 130, and second detection circuit 140 can be realized by a controller, such as a single-chip microcomputer.

[0113] In addition, referring to Figure 5 , an embodiment of the present invention further provides a drive control method, which is applied to Figure 1 , Figure 2 or Figure 3 the drive control circuit shown, and the drive control method includes but is not limited to the following steps:

[0114] Step 501: Control the drive circuit to stop working, and control the opening and closing of the switch component to switch the connection state of the three-phase windings;

[0115] Step 502: Obtain the back electromotive force voltage generated by the motor during the switching process of the connection state of the three-phase windings through the first detection circuit;

[0116] Step 503: Determine the position information of the rotor during the switching process of the connection state of the three-phase windings according to the back electromotive force voltage;

[0117] Step 504: According to the position information of the rotor during the switching process of the three-phase winding connection state, control the drive circuit to supply the drive voltage with the corresponding phase to the three-phase windings that have completed the connection state switching.

[0118] Among them, in step 501, controlling the drive circuit to stop working, that is, disconnecting all the power switching tubes of the drive circuit; controlling the opening and closing of the switching component to switch the connection state of the three-phase windings can be:

[0119] Controlling the first switch group to close and the second switch group to open, so that the three-phase windings are switched to star connection; or, controlling the first switch group to open and the second switch group to close, so that the three-phase windings are switched to delta connection.

[0120] Among them, referring to Figure 6 Based on Figure 1 Or Figure 2 As shown in the drive control circuit, in step 502 above, obtaining the back electromotive force voltage generated by the motor during the switching process of the three-phase winding connection state through the first detection circuit specifically includes the following steps:

[0121] Step 601: Obtain the first voltage detected by the first detection end, the second voltage detected by the second detection end, and the third voltage detected by the third detection end.

[0122] By separately detecting and obtaining the back electromotive force voltages of the fourth pin, the fifth pin, and the sixth pin of the second three-phase outgoing line group, it is beneficial to ensure the accuracy of detection.

[0123] In addition, referring to Figure 7 Based on Figure 3 As shown in the drive control circuit, in step 502 above, obtaining the back electromotive force voltage generated by the motor during the switching process of the three-phase winding connection state through the first detection circuit specifically includes the following steps:

[0124] Step 701: Obtain the first voltage detected by the first detection end and the second voltage detected by the second detection end.

[0125] By detecting and obtaining the back electromotive force voltages of two of the fourth pin, the fifth pin, and the sixth pin of the second three-phase outgoing line group, and then obtaining the back electromotive force voltage of the remaining pin according to the back electromotive force voltages of any two pins, it is beneficial to simplify the structure of the first detection circuit. Exemplarily, obtaining the third voltage according to the first voltage and the second voltage can be achieved by using Kirchhoff's voltage law.

[0126] Referring to Figure 8 In an embodiment, in step 503 above, determining the position information of the rotor during the switching process of the three-phase winding connection state specifically includes the following steps:

[0127] Step 801: Obtain the rotational speed of the rotor based on the back electromotive force voltage;

[0128] Step 802: Obtain the displacement of the rotor based on the integral of the rotational speed of the motor;

[0129] Step 803: Determine the position information of the rotor based on the displacement of the rotor.

[0130] Based on the back electromotive force voltage, the rotational speed of the rotor can be obtained. Then, by using the integral of the rotational speed of the rotor, the displacement of the rotor during the period when the drive circuit stops working can be obtained. Since the phase of the motor is known when the drive circuit is controlled to stop working, the position information of the rotor when the connection state of the three-phase windings is switched is determined according to the displacement of the rotor during the period when the drive circuit stops working.

[0131] Among them, referring to Figure 9 , in the above step 801, obtaining the rotational speed of the rotor based on the back electromotive force voltage specifically includes the following steps:

[0132] Step 901: Convert the back electromotive force voltage into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system;

[0133] Step 902: Obtain the back electromotive force amplitude according to the first voltage vector and the second voltage vector;

[0134] Step 903: Obtain the rotational speed of the rotor according to the back electromotive force amplitude.

[0135] In the above technical solution, the back electromotive force voltage is first converted, then the back electromotive force amplitude is obtained according to the first voltage vector and the second voltage vector, and finally the rotational speed of the rotor is obtained according to the back electromotive force amplitude. Converting the back electromotive force voltage to the two-phase stationary coordinate system can greatly simplify the subsequent analysis.

[0136] Exemplarily, in step 901, converting the back electromotive force voltage into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system can be achieved by using the Clarke transformation;

[0137] In step 902, obtaining the back electromotive force amplitude according to the first voltage vector and the second voltage vector can obtain the back electromotive force amplitude by calculating the root mean square of the first voltage vector and the second voltage vector;

[0138] In step 903, obtaining the rotational speed of the rotor according to the back electromotive force amplitude, in combination with the back electromotive force coefficient Ke and the number of pole pairs P in the motor parameters, the rotational speed of the rotor ωe = Em×(1000P / 60Ke) can be obtained.

[0139] In summary, even if the driving circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the continuous rotation of the rotor of the motor due to inertia. Then, the position information of the rotor of the motor during the switching process of the connection state of the three-phase windings can be determined according to the back electromotive force voltage. After the connection state of the three-phase windings is switched, the driving circuit outputs the driving voltage of the corresponding phase according to the position information of the rotor, so as to realize the switching of the connection state of the three-phase windings while the motor keeps running.

[0140] Referring to Figure 10 , in one embodiment, after the switching of the connection state of the three-phase windings is completed, the above driving control method may further include the following steps:

[0141] Step 1001: Obtain the phase current output when the driving circuit provides the driving voltage to the three-phase windings through the second detection circuit;

[0142] Step 1002: Determine the position information of the rotor when the three-phase windings are in the star connection or delta connection state according to the phase current;

[0143] Step 1003: Control the driving circuit to provide the driving voltage of the corresponding phase to the three-phase windings according to the position information of the rotor when the three-phase windings are in the star connection or delta connection state.

[0144] After the switching of the connection state of the three-phase windings is completed, the driving circuit provides the driving voltage to the three-phase windings again. The phase current of the three-phase windings can be detected through the second detection circuit, and then the position information of the rotor of the motor can be determined according to the phase current, which is convenient for the driving circuit to output the driving voltage of the corresponding phase according to the position information, realizing the closed-loop control of the motor and ensuring the stable and efficient operation of the motor.

[0145] Based on this, during the process of switching the connection state of the three-phase windings, since the motor is powered off and there is no phase current, the position information of the rotor is obtained according to the back electromotive force voltage; when the switching of the connection state of the three-phase windings is completed and the motor runs normally, the position information of the rotor is directly obtained according to the phase current. Therefore, the data detected by the first detection circuit and the second detection circuit can be selected according to the state of the three-phase windings.

[0146] Exemplarily, referring to Figure 11 , Figure 11It is a rotor position information conversion model. During the process of switching the connection state of the three-phase windings, the back electromotive force voltage and speed estimation module is connected to the position information conversion module, and the speed of the rotor is output from the back electromotive force voltage and speed estimation module to the position information conversion module. The position information conversion module converts to obtain the position information of the rotor. After the connection state of the three-phase windings is switched, the motor resumes normal operation, the phase current and speed estimation module is connected to the position information conversion module, and the speed of the rotor is output from the phase current and speed estimation module to the position information conversion module. The position information conversion module converts to obtain the position information of the rotor.

[0147] Refer to Figure 12 , Figure 12 is a circuit board provided by an embodiment of the present invention, including the drive control circuit in the above embodiment. Therefore, by setting the first detection circuit on the above circuit board, even if the drive circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the rotor of the motor continuing to rotate due to inertia. Then, the position information of the rotor of the motor during the process of switching the connection state of the three-phase windings can be determined according to the back electromotive force voltage, so that after the subsequent three-phase windings complete the switching of the connection state, it is convenient to output the drive voltage of the corresponding phase by the drive circuit according to the position information of the rotor, realizing the switching of the connection state of the three-phase windings while the motor keeps running.

[0148] Refer to Figure 13 An embodiment of the present invention also provides an air conditioner, which includes the circuit board in the above embodiment. Therefore, by setting the first detection circuit on the above air conditioner, even if the drive circuit stops working during the process of switching the connection state of the three-phase windings, the first detection circuit can be used to detect the back electromotive force voltage generated by the rotor of the motor continuing to rotate due to inertia. Then, the position information of the rotor of the motor during the process of switching the connection state of the three-phase windings can be determined according to the back electromotive force voltage, so that after the subsequent three-phase windings complete the switching of the connection state, it is convenient to output the drive voltage of the corresponding phase by the drive circuit according to the position information of the rotor, realizing the switching of the connection state of the three-phase windings while the motor keeps running, which is beneficial to improving the temperature stability of the air conditioner.

[0149] Refer to Figure 14 , Figure 14 is a schematic diagram of an air conditioner provided by an embodiment of the present invention. The air conditioner in the embodiment of the present invention includes one or more processors 1401 and a memory 1402. Figure 14 In

[0150] The processor 1401 and the memory 1402 can be connected through a bus or other means. Figure 14 In

[0151] The memory 1402, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1402 can include a high-speed random access memory 1402, and can also include a non-transitory memory 1402, such as at least one magnetic disk storage device, a flash memory component, or other non-transitory solid-state storage devices. In some embodiments, the memory 1402 optionally includes a memory 1402 that is remotely disposed relative to the processor 1401, and these remote memories 1402 can be connected to the operation control device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0152] Those skilled in the art can understand that Figure 14 the device structure shown in

[0153] does not constitute a limitation on the air conditioner, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements. Figure 5 The non-transitory software programs and instructions required to implement the drive control method applied to the air conditioner in the above embodiments are stored in the memory 1402. When executed by the processor 1401, the drive control method applied to the air conditioner in the above embodiments is executed. For example, the Figure 6 method steps 501 to 504 in Figure 7 the method steps 701 to 702 in Figure 8 the method steps 801 to 803 in Figure 9 the method steps 901 to 903 in Figure 10 the method steps 1001 to 1003 in

[0154] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] In addition, an embodiment of the present invention also provides a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by one or more processors 1401. For example, when executed by Figure 14 one of the processors 1401 in Figure 5 the method steps 501 to 504 in Figure 6 the method step 601 in Figure 7Method steps 701 to 702 in Figure 8 Method steps 801 to 803 in Figure 9 Method steps 901 to 903 in Figure 10 Method steps 1001 to 1003 in

[0156] Those of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all 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 can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium 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 technologies, CD-ROM, digital versatile disk (DVD), or other optical disk storage, magnetic cassette, tape, magnetic disk storage, or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0157] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A drive control circuit for driving a motor having a rotor and three-phase windings, one end of each winding forms a first three-phase output group, and the other end of each winding forms a second three-phase output group, characterized in that, The drive control circuit includes: A drive circuit, connected to the second three-phase output group, for providing a drive voltage to the three-phase winding; A switch assembly, including a first switch group and a second switch group. The first switch group is connected to the first three-phase output group, and the second switch group is respectively connected to the first three-phase output group and the second three-phase output group. When the first switch group is closed and the second switch group is open, the three-phase winding is switched to star connection; when the first switch group is open and the second switch group is closed, the three-phase winding is switched to delta connection; A first detection circuit, connected to the second three-phase output group, for detecting the back electromotive force voltage generated during the switching process of the connection state of the motor in the three-phase winding. The back electromotive force voltage is used to determine the position information of the rotor during the switching process of the connection state of the three-phase winding; A second detection circuit, for detecting the phase current output when the drive circuit provides a drive voltage to the three-phase winding. The phase current is used to determine the position information of the rotor when the three-phase winding is in star connection or delta connection state. The second detection circuit is connected to the second three-phase output group. The position information of the rotor when the three-phase winding is in star connection or delta connection state is used to control the drive circuit to provide a drive voltage with a corresponding phase to the three-phase winding; 2. The drive control circuit according to claim 1, wherein: The back electromotive force voltage is used to determine the rotational speed of the rotor during the switching process of the connection state of the three-phase winding, and the rotational speed is used to determine the position information of the rotor during the switching process of the connection state of the three-phase winding; 3. The drive control circuit according to claim 1, wherein: The first switch group includes a first switch and a second switch. The first three-phase output group includes a first pin, a second pin, and a third pin. The first switch is respectively connected to the first pin and the second pin, and the second switch is respectively connected to the second pin and the third pin; 4. The drive control circuit according to claim 1, characterized in that: The first switch group includes a first switch, a second switch, and a third switch. The first three-phase output group includes a first pin, a second pin, and a third pin. One ends of the first switch, the second switch, and the third switch are connected to each other, and the other ends of the first switch, the second switch, and the third switch are respectively connected to the first pin, the second pin, and the third pin; 5. The drive control circuit according to claim 1, wherein: The second switch group includes a fourth switch, a fifth switch, and a sixth switch. The first three-phase output group includes a first pin, a second pin, and a third pin. The second three-phase output group includes a fourth pin, a fifth pin, and a sixth pin. The fourth switch is respectively connected to the second pin and the sixth pin, the fifth switch is respectively connected to the third pin and the fifth pin, and the sixth switch is respectively connected to the first pin and the fourth pin; 6. The drive control circuit according to claim 5, wherein: The back electromotive force voltage includes a first voltage, a second voltage, and a third voltage; the first detection circuit includes a first detection terminal for detecting the first voltage output from the sixth pin, a second detection terminal for detecting the second voltage output from the fifth pin, and a third detection terminal for detecting the third voltage output from the fourth pin. The first detection terminal is connected to the sixth pin, the second detection terminal is connected to the fifth pin, and the third detection terminal is connected to the fourth pin.

7. The drive control circuit according to claim 5, wherein: The back electromotive force voltage includes a first voltage, a second voltage, and a third voltage; the first detection circuit includes a first detection terminal and a second detection terminal for detecting the back electromotive force voltage output from any two of the sixth pin, the fifth pin, and the fourth pin. The first detection terminal detects the first voltage, the second detection terminal detects the second voltage, and the third voltage is obtained based on the first voltage and the second voltage. The first detection terminal and the second detection terminal are respectively connected to any two of the sixth pin, the fifth pin, and the fourth pin.

8. The drive control circuit according to claim 1, wherein: The drive circuit includes a first arm, a second arm, and a third arm connected in parallel with each other. The first arm, the second arm, and the third arm each include two power switch tubes connected in series, and a diode is anti-parallelly connected to the power switch tube.

9. The drive control circuit according to claim 1, wherein: It further includes a power supply component, and the power supply component is connected to the drive circuit.

10. A drive control method is applied to a drive control circuit which is used to drive a motor having a rotor and three-phase windings. One end of each winding forms a first three-phase outgoing line group, and the other end of each winding forms a second three-phase outgoing line group. It is characterized in that, The drive control circuit includes: A drive circuit, connected to the second three-phase output line group; A switch component, including a first switch group and a second switch group. The first switch group is connected to the first three-phase output line group, and the second switch group is respectively connected to the first three-phase output line group and the second three-phase output line group. When the first switch group is closed and the second switch group is open, the three-phase winding is switched to the star connection. When the first switch group is open and the second switch group is closed, the three-phase winding is switched to the delta connection; A first detection circuit, connected to the second three-phase output line group; A second detection circuit, and the second detection circuit is connected to the second three-phase output line group; The drive control method includes: Controlling the drive circuit to stop working, and controlling the opening and closing of the switch component to switch the connection state of the three-phase winding; Obtaining the back electromotive force voltage generated by the motor during the switching process of the connection state of the three-phase winding through the first detection circuit; Determining the position information of the rotor during the switching process of the connection state of the three-phase winding according to the back electromotive force voltage; According to the position information of the rotor during the switching process of the connection state of the three-phase winding, controlling the drive circuit to provide a drive voltage with a corresponding phase to the three-phase winding that has completed the connection state switching; Obtaining the phase current output when the drive circuit provides a drive voltage to the three-phase winding through the second detection circuit; Determining the position information of the rotor when the three-phase winding is in the star connection or the delta connection state according to the phase current; Control the driving circuit to supply a driving voltage with a corresponding phase to the three-phase winding according to the position information of the rotor when the three-phase winding is in the star connection or the delta connection state.

11. The driving control method according to claim 10, characterized in that: During the process of switching the connection state of the three-phase winding, the position information of the rotor is obtained according to the back electromotive force voltage; After the switching of the connection state of the three-phase winding is completed, the position information of the rotor is obtained according to the phase current.

12. The drive control method according to claim 10, characterized in that, The second three-phase output line group includes a fourth pin, a fifth pin, and a sixth pin. The first detection circuit includes a first detection end, a second detection end, and a third detection end. The first detection end is connected to the sixth pin, the second detection end is connected to the fifth pin, and the third detection end is connected to the fourth pin. Obtaining the back electromotive force voltage generated by the motor during the process of switching the connection state of the three-phase winding through the first detection circuit includes: Obtain a first voltage detected by the first detection end, a second voltage detected by the second detection end, and a third voltage detected by the third detection end.

13. The drive control method according to claim 10, characterized in that, The second three-phase output line group includes a fourth pin, a fifth pin, and a sixth pin. The first detection circuit includes a first detection end and a second detection end. The first detection end and the second detection end are respectively connected to any two of the sixth pin, the fifth pin, and the fourth pin. Obtaining the back electromotive force voltage generated by the motor during the process of switching the connection state of the three-phase winding through the first detection circuit includes: Obtain a first voltage detected by the first detection end and a second voltage detected by the second detection end.

14. The drive control method according to claim 10, wherein Determining the position information of the rotor during the process of switching the connection state of the three-phase winding according to the back electromotive force voltage includes: Obtain the rotational speed of the rotor according to the back electromotive force voltage; Obtain the displacement of the rotor according to the integral of the rotational speed of the motor; Determine the position information of the rotor according to the displacement of the rotor.

15. The drive control method according to claim 14, characterized in that, Obtaining the rotational speed of the rotor according to the back electromotive force voltage includes: Convert the back electromotive force voltage into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system; Obtain the back electromotive force amplitude according to the first voltage vector and the second voltage vector; Obtain the rotational speed of the rotor according to the back electromotive force amplitude.

16. A circuit board, characterized in that: It includes a driving control circuit as described in any one of claims 1 to 9.

17. An air conditioner, characterized in that: It includes a circuit board as described in claim 16; Or, 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. The instructions are executed by the at least one processor so that the at least one processor can execute the driving control method as described in any one of claims 10 to 15.

18. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to execute the driving control method as described in any one of claims 10 to 15.

Images