CN111355419A - Drive control circuit, drive control method, circuit board and air conditioner - Google Patents

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

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Publication number
CN111355419A
CN111355419A CN202010300526.7A CN202010300526A CN111355419A CN 111355419 A CN111355419 A CN 111355419A CN 202010300526 A CN202010300526 A CN 202010300526A CN 111355419 A CN111355419 A CN 111355419A
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CN
China
Prior art keywords
pin
phase
voltage
switch
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010300526.7A
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Chinese (zh)
Inventor
赵鸣
黄招彬
文先仕
曾贤杰
张杰楠
胡斌
徐锦清
龙谭
时崎久
堀部美彦
井上薰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Publication date
Application filed by Midea Group Co Ltd, GD Midea Air Conditioning Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN202010300526.7A priority Critical patent/CN111355419A/en
Publication of CN111355419A publication Critical patent/CN111355419A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/184—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/182—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays whereby the speed is regulated by using centrifucal devices, e.g. switch, resistor

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a drive control circuit, a drive control method, a circuit board and an air conditioner, wherein the drive control circuit comprises a drive circuit, a switch component and a first detection circuit, even if the drive circuit stops working in the process of switching the connection state of a three-phase winding, the first detection circuit can be used for detecting the counter potential voltage generated by the continuous operation of a rotor of a motor due to inertia, and then the position information of the rotor of the motor in the process of switching the connection state of the three-phase winding can be determined according to the counter potential voltage, so that after the subsequent three-phase winding completes the connection state switching, the drive circuit can conveniently output the drive voltage of a corresponding phase according to the position information of the rotor, and the connection state of the three-phase winding can be switched under the condition that the motor keeps operating.

Description

Drive control circuit, drive control method, circuit board and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a drive control circuit, a drive control method, a circuit board, an air conditioner and a storage medium.
Background
The variable frequency compressor of the existing variable frequency air conditioner mostly adopts the permanent magnet motor as the driving motor and is influenced by the operation requirement of the variable frequency air conditioner, the three-phase winding of the permanent magnet motor generally needs to be switched between star connection and delta connection, and when the connection state is switched by utilizing the existing scheme, the permanent magnet motor needs to be powered off and stop running, so that the operation of the compressor is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, 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 three-phase windings while a motor remains in operation.
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 of the windings forming a first three-phase outgoing line group, and the other end of each of the windings forming a second three-phase outgoing line group, the drive control circuit including:
the driving circuit is connected with the second three-phase outgoing line group and used for providing driving voltage for the three-phase windings;
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched to be in star connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched to be in triangular connection;
and a first detection circuit connected to the second three-phase outgoing line group, for detecting a back electromotive voltage generated by the motor during switching of connection states of the three-phase windings, the back electromotive voltage being used to determine positional information of the rotor during switching of connection states of the three-phase windings.
The drive control circuit provided by the embodiment of the invention at least has the following beneficial effects: by arranging the first detection circuit, even if the driving circuit stops working in the process of switching the connection state of the three-phase winding, the first detection circuit can be used for detecting the counter electromotive voltage generated by the continuous operation of the rotor of the motor due to inertia, and then the position information of the rotor of the motor in the process of switching the connection state of the three-phase winding can be determined according to the counter electromotive voltage, so that the driving circuit can output the driving voltage of the corresponding phase according to the position information of the rotor after the subsequent three-phase winding completes the connection state switching, and the connection state of the three-phase winding can be switched under the condition that the motor keeps operating.
In some embodiments of the present invention, the back-emf voltage is used to determine a rotational speed of the rotor during switching of the connection states of the three-phase windings, the rotational speed being used to determine positional information of the rotor during switching of the connection states of the three-phase windings.
In the technical scheme, the rotating speed of the rotor is obtained by utilizing the counter electromotive voltage, and then the position information of the rotor is obtained by utilizing the rotating speed of the rotor.
In some embodiments of the present invention, the drive control circuit further comprises:
a second detection circuit, configured to detect a phase current output by the driving circuit in a state where the driving circuit supplies a driving voltage to the three-phase winding, where the phase current is used to determine position information of the rotor in a state where the three-phase winding is in the star connection or the delta connection, and the second detection circuit is connected to the second three-phase outgoing line group.
In the above technical scheme, by setting the second detection circuit, when the motor operates normally, namely the driving circuit provides driving voltage for the three-phase winding, the phase current of the three-phase winding can be detected by the second detection circuit, and then the position information of the rotor of the motor is determined according to the phase current, so that the driving circuit can output the driving voltage of the corresponding phase according to the position information, the closed-loop control of the motor is realized, and the stable and efficient operation of the motor is ensured.
In some embodiments of the present invention, the first switch group includes a first switch and a second switch, the first three-phase outgoing line 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.
In the above technical scheme, the first switch group includes the first switch and the second switch, and when the first switch and the second switch are simultaneously closed and the second switch group is in the off state, the first pin, the second pin and the third pin are connected to each other at this time, so that the three-phase winding is in the star connection state.
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 outgoing 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.
In the above technical scheme, the first switch group includes a first switch, a second switch and a third switch, and when the first switch, the second switch and the third switch are simultaneously closed and the second switch group is in an off state, the first pin, the second pin and the third pin are connected to each other at this time, so that the three-phase winding is in a star connection state.
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 outgoing line group includes a first pin, a second pin and a third pin, the second three-phase outgoing 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.
Among the above-mentioned technical scheme, the second switch group includes fourth switch, fifth switch and sixth switch, and is closed simultaneously when fourth switch, fifth switch and sixth switch, and first switch group is in the off-state, second pin and sixth pin interconnect this moment, third pin and fifth pin interconnect, first pin and fourth pin interconnect for three-phase winding is the triangle-shaped connection.
In some embodiments of the invention, the back-emf voltage comprises a first voltage, a second voltage, and a third voltage; the first detection circuit comprises a first detection end, a second detection end and a third detection end, the first detection end is used for detecting the first voltage output by the sixth pin, the second detection end is used for detecting the second voltage output by the fifth pin, the third detection end is used for detecting the third voltage output by the fourth pin, the first detection end is connected with the sixth pin, the second detection end is connected with the fifth pin, and the third detection end is connected with the fourth pin.
In the above technical scheme, the first detection circuit includes a first detection end, a second detection end and a third detection end, and can detect back electromotive voltage of the fourth pin, the fifth pin and the sixth pin of the second three-phase outgoing line group respectively, which is beneficial to ensuring detection accuracy.
In some embodiments of the invention, the back-emf voltage comprises a first voltage, a second voltage, and a third voltage; the first detection circuit comprises a first detection end and a second detection end, the first detection end is used for detecting back electromotive force voltages output by any two of a sixth pin, a fifth pin and a 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 and correspondingly connected with any two of the sixth pin, the fifth pin and the fourth pin.
In the above technical scheme, the first detection circuit includes a first detection end and a second detection end, and can detect back electromotive voltage of any two pins of a fourth pin, a fifth pin and a sixth pin of the second three-phase outgoing line group respectively, and then can obtain back electromotive voltage of the remaining pin according to the back electromotive voltage of the any two pins, which is beneficial to simplifying the structure of the first detection circuit.
In some embodiments of the present invention, the driving circuit includes a first bridge arm, a second bridge arm, and a third bridge arm that are connected in parallel to each other, each of the first bridge arm, the second bridge arm, and the third bridge arm includes two power switching tubes connected in series, and the power switching tubes are connected in anti-parallel with diodes.
In the technical scheme, the first bridge arm, the second bridge arm and the third bridge arm form a three-phase bridge structure, and the driving circuit can output the driving voltage matched with the current phase of the motor by controlling the on-off states of the six power switching tubes.
In some embodiments of the invention, a power supply component is further included, the power supply component being connected to the drive circuit.
In the technical scheme, the power supply assembly is arranged, so that the input voltage can be provided for the driving circuit, and the driving motor can run.
In a second aspect, an embodiment of the present invention further provides a driving control method applied to a driving control circuit, where the driving control circuit is configured to drive a motor having a rotor and three-phase windings, one end of each phase of the windings constitutes a first three-phase outgoing line group, and the other end of each phase of the windings constitutes a second three-phase outgoing line group, and the driving control circuit includes:
the driving circuit is connected with the second three-phase outgoing line group;
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched to be in star connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched to be in triangular connection;
the first detection circuit is connected with the second three-phase outgoing line group;
the drive control method includes:
controlling the driving circuit to stop working, and controlling the switch assembly to be switched on and off so as to enable the three-phase winding to be switched over in a connection state;
acquiring back electromotive voltage generated by the motor in the process of switching the connection state of the three-phase winding through the first detection circuit;
determining position information of the rotor in the switching process of the connection state of the three-phase winding according to the back electromotive voltage;
and controlling the driving circuit to provide driving voltage of a corresponding phase to the three-phase winding which completes the connection state switching according to the position information of the rotor in the three-phase winding connection state switching process.
The drive control method provided by the embodiment of the invention at least has the following beneficial effects: even if the driving circuit stops working in the process of switching the connection state of the three-phase winding, the first detection circuit can be used for detecting the counter electromotive voltage generated by the continuous operation of the rotor of the motor due to inertia, then the position information of the rotor of the motor in the process of switching the connection state of the three-phase winding can be determined according to the counter electromotive voltage, after the connection state switching of the three-phase winding is completed, the driving circuit is enabled to output the driving voltage of the corresponding phase according to the position information of the rotor, and the connection state of the three-phase winding is switched under the condition that the motor keeps operating.
In some embodiments of the present invention, the drive control circuit further includes a second detection circuit that connects the second three-phase outgoing line group, and the drive control method further includes:
obtaining, by the second detection circuit, a phase current output in a state where the drive circuit supplies a drive voltage to the three-phase winding;
determining position information of the rotor when the three-phase winding is in the star connection state or the delta connection state according to the phase current;
and controlling the driving circuit to provide driving voltage of 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 state or the delta connection state.
In the above technical scheme, when the motor operates normally, that is, the driving circuit provides driving voltage to the three-phase winding, the phase current of the three-phase winding can be detected through the second detection circuit, and then the position information of the rotor of the motor is determined according to the phase current, so that the driving circuit can output the driving voltage of the corresponding phase according to the position information, the closed-loop control of the motor is realized, and the stable and efficient operation of the motor is ensured.
In some embodiments of the present invention, during the switching of the connection state of the three-phase winding, the position information of the rotor is obtained from the back electromotive voltage;
and after the connection state of the three-phase winding is switched, the position information of the rotor is obtained according to the phase current.
In the technical scheme, in the process of switching the connection state of the three-phase winding, as the motor is powered off and phase current does not exist, the position information of the rotor is obtained according to the back electromotive voltage; after the connection state of the three-phase winding is switched, the motor operates normally, so that the position information of the rotor is directly obtained according to the phase current, and data detected by the first detection circuit and the second detection circuit can be selectively obtained according to the state of the three-phase winding.
In some embodiments of the present invention, the second three-phase outgoing line group includes a fourth pin, a fifth pin, and a sixth pin, the first detection circuit includes a first detection terminal, a second detection terminal, and a third detection terminal, the first detection terminal is connected to the sixth pin, the second detection terminal is connected to the fifth pin, the third detection terminal is connected to the fourth pin, and the obtaining, by the first detection circuit, a back electromotive voltage generated by the motor during the connection state switching process of the three-phase winding includes:
and acquiring 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.
In the above technical scheme, the back electromotive voltages of the fourth pin, the fifth pin and the sixth pin of the second three-phase outlet line group are respectively detected and acquired, so that the detection accuracy is favorably ensured.
In some embodiments of the present invention, the second three-phase outgoing 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 pins of the sixth pin, the fifth pin, and the fourth pin, and the obtaining, by the first detection circuit, a back electromotive voltage generated by the motor in a connection state switching process of the three-phase winding includes:
and acquiring a first voltage detected by the first detection end and a second voltage detected by the second detection end.
In the above technical scheme, by detecting and obtaining the counter electromotive voltage of two of the fourth pin, the fifth pin and the sixth pin of the second three-phase outlet line group, the counter electromotive voltage of the remaining pin is obtained according to the counter electromotive voltages of any two pins, which is beneficial to simplifying the structure of the first detection circuit.
In some embodiments of the present invention, the determining position information of the rotor during switching of the connection state of the three-phase winding according to the back electromotive voltage includes:
obtaining the rotating speed of the rotor according to the counter potential voltage;
obtaining the displacement of the rotor according to the integral of the rotating speed of the motor;
and determining the position information of the rotor according to the displacement of the rotor.
In the above technical solution, the rotation speed of the rotor is obtained according to the back electromotive voltage, and then the displacement of the rotor during the period when the driving circuit stops operating can be obtained by using the integral of the rotation speed of the rotor.
In some embodiments of the present invention, the deriving the rotation speed of the rotor from the back electromotive voltage includes:
converting the counter electromotive voltage into a first voltage vector and a second voltage vector under a two-phase static coordinate system;
obtaining a counter potential amplitude according to the first voltage vector and the second voltage vector;
and obtaining the rotating speed of the rotor according to the counter potential amplitude.
In the technical scheme, the counter electromotive voltage is converted, the counter electromotive amplitude is obtained according to the first voltage vector and the second voltage vector, the rotating speed of the rotor is obtained according to the counter electromotive amplitude, the counter electromotive voltage is converted to the two-phase static coordinate system, and subsequent analysis can be greatly simplified.
In a third aspect, an embodiment of the present invention further provides a circuit board, including the driving control circuit according to the first aspect.
Therefore, by arranging the first detection circuit, even if the driving circuit stops working in the process of switching the connection state of the three-phase winding, the first detection circuit can be used for detecting the counter electromotive voltage generated by the continuous operation of the rotor of the motor due to inertia, and then the position information of the rotor of the motor in the process of switching the connection state of the three-phase winding can be determined according to the counter electromotive voltage, so that the driving circuit can output the driving voltage of the corresponding phase according to the position information of the rotor after the subsequent three-phase winding completes the connection state switching, and the connection state of the three-phase winding can be switched under the condition that the motor keeps operating.
In a fourth aspect, an embodiment of the present invention further provides an air conditioner, including the circuit board of the third aspect.
Alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the drive control method of the second aspect.
Therefore, by arranging the first detection circuit, even if the driving circuit stops working in the process of switching the connection state of the three-phase winding, the first detection circuit can be used for detecting the counter electromotive force voltage generated by the continuous operation of the rotor of the motor due to inertia, and then the position information of the rotor of the motor in the process of switching the connection state of the three-phase winding can be determined according to the counter electromotive force voltage, so that the driving circuit can output the driving voltage of the corresponding phase according to the position information of the rotor after the subsequent three-phase winding completes the connection state switching, the connection state of the three-phase winding is switched under the condition that the motor keeps operating, and the temperature stability of the air conditioner is improved.
In a fifth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to cause a computer to execute the drive control method according to the second aspect.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic circuit diagram of a driving control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a driving control circuit according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a driving control circuit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 5 is a flowchart of a driving control method according to an embodiment of the present invention;
fig. 6 is a flowchart for acquiring back electromotive voltage generated by the motor during switching of connection states of three-phase windings through the first detection circuit according to an embodiment of the present invention;
fig. 7 is a flowchart for acquiring a back electromotive voltage generated by the motor during switching of the connection state of the three-phase winding through the first detection circuit according to another embodiment of the present invention;
fig. 8 is a flowchart for determining position information of a rotor during switching of connection states of three-phase windings according to back emf voltages, according to an embodiment of the present invention;
FIG. 9 is a flow chart for obtaining a rotational speed of a rotor based on a back emf voltage, provided in accordance with an embodiment of the present invention;
fig. 10 is a flowchart illustrating supplementary steps of a driving control method according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a rotor position information transformation model provided in accordance with an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a circuit board according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply 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 limiting the present invention.
In the description of the present invention, at least two means are one or more, a plurality means are at least two, and greater than, less than, more than, etc. are understood as excluding the present numbers, and above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The variable frequency compressor of the existing variable frequency air conditioner mostly adopts the permanent magnet motor as the driving motor and is influenced by the operation requirement of the variable frequency air conditioner, the three-phase winding of the permanent magnet motor generally needs to be switched between star connection and delta connection, and when the connection state is switched by utilizing the existing scheme, the permanent magnet motor needs to be powered off and stop running, so that the operation of the compressor is influenced.
Based on this, the embodiment of the invention provides 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 a three-phase winding of a motor without influencing the normal operation of a compressor.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 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 constituting a first three-phase outgoing line group 101 and the other end of each phase winding constituting a second three-phase outgoing line group 102, the drive control circuit including a drive circuit 110 for supplying a drive voltage to the three-phase windings 100, a switching element 120, a first detection circuit 130 for detecting a back electromotive voltage generated by the motor during switching of connection states of the three-phase windings 100, a second detection circuit 140 for detecting a phase current output in a state where the drive circuit 110 supplies the drive voltage to the three-phase windings 100, the drive circuit 110 being connected to the second three-phase outgoing line group 102; the switch assembly 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 outgoing line group 101, the second switch group 122 is respectively connected to the first three-phase outgoing line group 101 and the second three-phase outgoing line group 102, the first switch group 121 is closed, the second switch group 122 is open, the three-phase winding 100 is switched to a star connection, the first switch group 121 is open, the second switch group 122 is closed, and the three-phase winding 100 is switched to a delta connection; the first detection circuit 130 is connected to the second three-phase outlet line group 102, and the second detection circuit 140 is connected to the second three-phase outlet line group 102.
The rotating speed of the rotor in the switching process of the connection state of the three-phase winding 100 is determined through the counter potential voltage, and then the position information of the rotor in the switching process of the connection state of the three-phase winding 100 is determined according to the rotating speed.
In an embodiment, the three-phase winding 100 includes a three-phase winding, pins of a first phase winding, a second phase winding and a third phase winding are led out of the motor, two ends of the first phase winding are led out of a first pin M1 and a sixth pin M6 respectively, two ends of the second phase winding are led out of a second pin M2 and a fifth pin M5 respectively, and two ends of the third phase winding are led out of a third pin M3 and a fourth pin M4 respectively, based on which the first three-phase outgoing line group 101 includes a first pin M1, a second pin M2 and a third pin M3, and the second three-phase outgoing line group 102 includes a fourth pin M4, a fifth pin M5 and a sixth pin M6.
The driving circuit 110 provides driving voltage to the three-phase winding 100 to enable the motor to operate, in the operation process of the motor, the three-phase winding is in a star connection state or a delta connection state, and closed-loop control needs to be performed on the motor through position information of the rotor, so that phase current of the three-phase winding 100 is detected through the second detection circuit 140, and then the position information of the rotor of the motor when the three-phase winding is in the star connection state or the delta connection state (namely when the motor operates normally) is determined according to the phase current, so that the driving circuit 110 can output driving voltage of a corresponding phase according to the position information, closed-loop control on the motor is achieved, and stable and efficient operation of.
Illustratively, 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, the sixth detection terminal I3 is connected to the fourth pin M4, based on this, the fourth detection terminal I1 detects a first current, the fifth detection terminal I2 detects a second current, the sixth detection terminal I3 detects a third current, and the second detection circuit 140 detects a phase current of the three-phase winding 100 including the first current, the second current, and the third current. After obtaining the phase current of the three-phase winding 100, clark conversion is performed, position and speed estimation is performed according to clark converted data, so that position information of the rotor in a star connection or delta connection state of the three-phase winding can be obtained, and the driving circuit 110 can be controlled to output driving voltage of a corresponding phase to the three-phase winding 100 by means of inverse park transformation, SVPWM and the like according to the position information.
In an embodiment, the first switch group 121 includes a first switch K1 and a second switch K2, the second switch group 122 includes a fourth switch K4, a fifth switch K5 and a sixth switch K6, the first switch K1 is connected to the first pin M1 and the second pin M2, respectively, the second switch K2 is connected to the second pin M2 and the third pin M3, respectively, the fourth switch K4 is connected to the second pin M2 and the sixth pin M6, respectively, the fifth switch K5 is connected to the third pin M3 and the fifth pin M5, respectively, and the sixth switch K6 is connected to the first pin M1 and the fourth pin M4, respectively.
When the first switch K1 and the second switch K2 are simultaneously closed and the second switch group 122 is in an open state, 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 a star connection state; when the fourth switch K4, the fifth switch K5 and the sixth switch K6 are simultaneously turned on and the first switch group 121 is in an open state, 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 a delta connection.
Referring to fig. 2, in an 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, and the other ends of the first switch K1, the second switch K2, and the third switch K3 are respectively connected to the first pin M1, the second pin M2, and the third pin M3, respectively, so that when the first switch K1, the second switch K2, and the third switch K3 are simultaneously closed and the second switch group 122 is in an open state, the first pin M1, the second pin M2, and the third pin M3 are connected to each other, the three-phase winding 100 may also be in a star connection state.
In an embodiment, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 may be switch tubes. Or, the switch can be selected from an electromagnetic relay, a solid-state relay, a contactor or an electronic switch, so that the switch has the advantages of stability in switching and low cost. In an embodiment, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are all single-pole single-throw relays. It should be added that if the electronic switch is selected, its on-resistance does not exceed 1 ohm.
Generally, the three-phase winding 100 needs to be switched between the star connection and the delta connection according to the operation requirements of the motor. However, when the three-phase winding 100 is switched to the connection state, the driving circuit 110 needs to stop operating, and at this time, the second detection circuit 140 cannot detect the phase current output from the driving circuit 110 to determine the position information of the rotor. Even if the driving circuit 110 stops operating, the rotor of the motor will continue to operate due to inertia, the three-phase winding 100 will supply power to the outside, and the motor will generate a counter electromotive voltage, so that the counter electromotive voltage can be detected by the first detecting circuit 130 to determine the position information of the rotor during the switching of the connection state of the three-phase winding.
In an 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, so that the first detection terminal V1 can detect a first voltage output from the sixth pin M6, the second detection terminal V2 can detect a second voltage output from the fifth pin M5, and the third detection terminal V3 can detect a third voltage output from the fourth pin M4, based on which the counter potential voltage output from the second three-phase outgoing line group 102 includes the first voltage, the second voltage, and the third voltage. The first detection circuit 130 can detect the back-emf voltages of the fourth pin M4, the fifth pin M5 and the sixth pin M6 of the second three-phase outgoing line group 102 respectively by setting the first detection terminal V1, the second detection terminal V2 and the third detection terminal V3, which is beneficial to ensuring the detection accuracy.
In addition, in an embodiment, the first detection circuit 130 may only be provided with a first detection terminal V1 and a second detection terminal V2, and the first detection terminal V1 and the second detection terminal V2 are respectively connected to any two pins of the sixth pin M6, the fifth pin M5 and the fourth pin M4, schematically, as shown in fig. 3, 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, so that the first detection terminal V1 may detect the first voltage output by the sixth pin M6, the second detection terminal V2 may detect the second voltage output by the fifth pin M5, and then the third voltage output by the fourth pin M4 may be obtained based on the first voltage and the second voltage, and exemplarily, the third voltage may be obtained by using the first voltage and the second voltage according to kirchhoff voltage criterion. It is understood that fig. 3 only shows one possible embodiment, the first detecting terminal V1 and the second detecting terminal V2 may be respectively connected to any two pins of the sixth pin M6, the fifth pin M5 and the fourth pin M4, and then the counter potential voltage of the remaining pin may be obtained according to the detected counter potential voltages of the any 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.
For example, the first detection circuit 130 may be a voltage sampling circuit, a voltage sensor, or the like; the second detection circuit 140 may be a current sampling circuit, a current sensor, or the like. Accordingly, when the first detection circuit 130 is a voltage sampling circuit, a sampling resistor R as shown in fig. 1, 2, or 3 needs to be provided.
After the first detection circuit 130 detects the back electromotive voltage output by the second three-phase outlet line group 102, the rotation speed of the rotor may be obtained according to the back electromotive voltage, for example, the back electromotive voltage may be first converted into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system, where as an exemplary conversion method, clark transformation may be used to obtain the back electromotive amplitude Em according to the root-mean-square of the first voltage vector and the second voltage vector, and finally, the rotation speed ω e of the rotor may be obtained as Em × (1000P/60Ke) by using the back electromotive amplitude Em in combination with the back electromotive coefficient Ke and the pole pair number P in the motor parameter.
Then, after the rotational speed of the rotor is obtained, the displacement of the rotor during the period in which the drive circuit 110 stops operating, that is, the displacement of the rotor due to inertia after the drive circuit 110 stops operating, can be obtained by integrating the rotational speed of the rotor.
Since the phase of the motor is known (for example, it can be obtained by detecting the phase current by the second detection circuit 140) when the control drive circuit 110 stops operating, the initial position information of the rotor is known when the control drive circuit 110 stops operating, and therefore, the position information of the rotor at the time of completion of switching the connection state of the three-phase winding 100 can be determined based on the displacement of the rotor during the period of time when the drive circuit 110 stops operating. Therefore, after the connection state of the three-phase winding 100 is switched, the driving voltage of the corresponding phase is conveniently output according to the position information, and the motor can normally run after the connection state of the three-phase winding 100 is switched. For example, the driving circuit 110 may be controlled to output the driving voltage of the corresponding phase to the three-phase winding 100 by inverse park transformation, SVPWM, or the like according to the position information.
Referring to fig. 4, in an embodiment, driving circuit 110 includes a first leg 410, a second leg 420, and a third leg 430 that are connected in parallel, where each of first leg 410, second leg 420, and third leg 430 includes two power switching tubes Q connected in series, and diodes D are connected in anti-parallel to power switching tubes Q. The first bridge arm 410, the second bridge arm 420 and the third bridge arm 430 form a three-phase bridge structure, and the driving circuit 110 can output a driving voltage matched with the current phase of the motor by controlling the on-off states of the six power switching tubes Q. Referring to fig. 1, correspondingly, three output terminals a1, B1 and C1 of the driving 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.
Illustratively, the power switch Q of the driving circuit 110 may employ a metal oxide semiconductor MOS device, and may also employ an insulated gate bipolar IGBT device. Compared with an IGBT device, the MOS device has the advantages of small current and low conduction voltage drop when in light load, so that the operation efficiency is high. And the IGBT device has the advantage of low cost.
In one embodiment, the driving control circuit further comprises a power supply component 150, and the power supply component 150 is connected to the driving circuit 110. The power supply assembly 150 may provide an input voltage to the drive circuit 110 to effect drive motor operation. In other embodiments, the power supply component 150 may also be provided independently of the drive control circuitry.
In one embodiment, the power module 150 includes an ac power source and a rectifying module for converting the ac power source to a dc output, the ac power source is connected to the rectifying module, and the rectifying module is connected to the driving circuit 110. By providing a rectifying component, the ac power can be converted into dc output to adapt to the input signal requirement of the driving circuit 110.
In an embodiment, the driving control circuit further includes a filter component, and by providing the filter component, the interference signal of the power supply component 150 can be filtered out, so as to improve the stability of the power supply component 150. In one embodiment, the filter assembly comprises an electrolytic capacitor C, and the filter assembly adopts the electrolytic capacitor C, so that the filter assembly has the advantages of simple structure and low cost.
In an embodiment, the control of the driving circuit 110, the switch assembly 120, the first detecting circuit 130, and the second detecting circuit 140 can be implemented by using a controller, for example, a single chip microcomputer.
In addition, referring to fig. 5, an embodiment of the present invention further provides a driving control method, which is applied to the driving control circuit shown in fig. 1, fig. 2, or fig. 3, and the driving control method includes, but is not limited to, the following steps:
step 501: the driving circuit is controlled to stop working, and the switching of the switch assembly is controlled to enable the three-phase winding to switch the connection state;
step 502: acquiring back electromotive voltage generated by the motor in the switching process of the connection state of the three-phase winding through a first detection circuit;
step 503: determining position information of the rotor in the switching process of the connection state of the three-phase winding according to the back electromotive voltage;
step 504: and controlling the driving circuit to provide driving voltage of a corresponding phase to the three-phase winding which completes the connection state switching according to the position information of the rotor in the three-phase winding connection state switching process.
In step 501, the driving circuit is controlled to stop working, that is, all power switches of the driving circuit are turned off; the switching of the switch assembly is controlled to switch the connection state of the three-phase winding, which may be:
controlling the first switch group to be closed and the second switch group to be opened so as to switch the three-phase winding to be in star connection; or the first switch group is controlled to be switched off, and the second switch group is controlled to be switched on, so that the three-phase winding is switched to be in triangular connection.
Referring to fig. 6, based on the driving control circuit shown in fig. 1 or fig. 2, in the step 502, obtaining a back electromotive voltage generated by the motor in the process of switching the connection state of the three-phase windings through the first detection circuit specifically includes the following steps:
step 601: and acquiring 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.
The back electromotive voltage of the fourth pin, the fifth pin and the sixth pin of the second three-phase outgoing line group is detected and acquired respectively, so that the detection accuracy is guaranteed.
In addition, referring to fig. 7, based on the driving control circuit shown in fig. 3, in the step 502, obtaining the back electromotive voltage generated by the motor in the process of switching the connection state of the three-phase winding through the first detection circuit specifically includes the following steps:
step 701: and acquiring a first voltage detected by the first detection end and a second voltage detected by the second detection end.
The back electromotive voltage of two pins of the fourth pin, the fifth pin and the sixth pin of the second three-phase outgoing line group is detected and obtained, and the back electromotive voltage of the rest pin is obtained according to the back electromotive voltages of any two pins, so that the structure of the first detection circuit is simplified. Illustratively, deriving the third voltage from the first voltage and the second voltage may be accomplished using kirchhoff's voltage criterion.
Referring to fig. 8, in an embodiment, in the step 503, 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 voltage specifically includes the following steps:
step 801: obtaining the rotating speed of the rotor according to the counter potential voltage;
step 802: obtaining the displacement of the rotor according to the integral of the rotating speed of the motor;
step 803: and determining the position information of the rotor according to the displacement of the rotor.
The rotating speed of the rotor is obtained according to the counter electromotive voltage, and the displacement of the rotor in the period of time when the driving circuit stops working can be obtained by utilizing the integral of the rotating speed of the rotor.
Referring to fig. 9, in step 801, obtaining the rotation speed of the rotor according to the back electromotive voltage specifically includes the following steps:
step 901: converting the counter electromotive voltage into a first voltage vector and a second voltage vector under a two-phase static coordinate system;
step 902: obtaining a counter potential amplitude according to the first voltage vector and the second voltage vector;
step 903: and obtaining the rotating speed of the rotor according to the counter potential amplitude.
In the technical scheme, the counter electromotive voltage is converted, the counter electromotive amplitude is obtained according to the first voltage vector and the second voltage vector, the rotating speed of the rotor is obtained according to the counter electromotive amplitude, the counter electromotive voltage is converted to the two-phase static coordinate system, and subsequent analysis can be greatly simplified.
Exemplarily, in step 901, the back electromotive voltage is converted into a first voltage vector and a second voltage vector in a two-phase stationary coordinate system, which may be implemented by using clark transformation;
in step 902, obtaining a back electromotive force amplitude according to the first voltage vector and the second voltage vector, wherein the back electromotive force amplitude can be obtained by solving a root mean square of the first voltage vector and the second voltage vector;
in step 903, the rotation speed of the rotor is obtained according to the counter electromotive force amplitude, and the counter electromotive force coefficient Ke and the pole pair number P in the motor parameters may be combined, so that the rotation speed ω e of the rotor is obtained as Em × (1000P/60 Ke).
In summary, even if the driving circuit stops working during the process of switching the connection state of the three-phase winding, the first detection circuit can be used to detect the counter electromotive voltage generated by the continuous operation of the rotor of the motor 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 winding can be determined according to the counter electromotive voltage, and after the connection state switching of the three-phase winding is completed, the driving circuit is enabled to output the driving voltage of the corresponding phase according to the position information of the rotor, so that the connection state of the three-phase winding is switched under the condition that the motor keeps operating.
Referring to fig. 10, in an embodiment, after the three-phase winding completes the switching of the connection state, the driving control method may further include the following steps:
step 1001: phase current output by the driving circuit in a state that the driving circuit provides driving voltage for the three-phase winding is obtained through the second detection circuit;
step 1002: determining the position information of the rotor when the three-phase winding is in a star connection or triangular connection state according to the phase current;
step 1003: and controlling the driving circuit to provide driving voltage of 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 delta connection state.
After the three-phase winding completes the switching of the connection state, the driving circuit provides driving voltage for the three-phase winding again, the phase current of the three-phase winding can be detected through the second detection circuit, the position information of the rotor of the motor is determined according to the phase current, the driving circuit can output the driving voltage of the corresponding phase according to the position information, the closed-loop control of the motor is achieved, and the stable and efficient operation of the motor is guaranteed.
Based on the above, in the process of switching the connection state of the three-phase winding, as the motor is powered off, no phase current exists, and therefore the position information of the rotor is obtained according to the back electromotive voltage; after the connection state of the three-phase winding is switched, the motor operates normally, so that the position information of the rotor is directly obtained according to the phase current, and data detected by the first detection circuit and the second detection circuit can be selectively obtained according to the state of the three-phase winding.
Exemplarily, referring to fig. 11, fig. 11 is a rotor position information conversion model, in the process of switching the connection state of the three-phase winding, the back electromotive voltage and rotation speed estimation module is connected to the position information conversion module, the back electromotive voltage and rotation speed estimation module outputs the rotation speed of the rotor to the position information conversion module, and the position information conversion module converts the rotation speed of the rotor to obtain the position information of the rotor; after the connection state of the three-phase winding is switched, the motor recovers to normal operation, the phase current rotating speed estimation module is connected with the position information conversion module, the phase current rotating speed estimation module outputs the rotating speed of the rotor to the position information conversion module, and the position information conversion module converts the rotating speed of the rotor to obtain the position information of the rotor.
Referring to fig. 12, fig. 12 is a circuit board according to an embodiment of the present invention, which includes the driving control circuit in the above embodiment, and therefore, by providing the first detection circuit, even if the driving circuit stops operating during the process of switching the connection state of the three-phase winding, the circuit board can detect the back electromotive voltage generated by the rotor of the motor due to the continuous operation of inertia by using the first detection circuit, and then, the position information of the rotor of the motor during the process of switching the connection state of the three-phase winding can be determined according to the back electromotive voltage, so that after the connection state switching of the subsequent three-phase winding is completed, the driving circuit can output the driving voltage of the corresponding phase according to the position information of the rotor, and the connection state of the three-phase winding can be switched while the motor keeps operating.
Referring to fig. 13, an embodiment of the present invention further provides an air conditioner, where the air conditioner includes the circuit board in the above embodiment, and therefore, by providing the first detection circuit, even if the driving circuit stops operating during the process of switching the connection state of the three-phase winding, the air conditioner can detect the back electromotive voltage generated by the rotor of the motor due to continuous operation of inertia by using the first detection circuit, and then can determine the position information of the rotor of the motor during the process of switching the connection state of the three-phase winding according to the back electromotive voltage, so that after the connection state switching of the subsequent three-phase winding is completed, the driving circuit can output the driving voltage of the corresponding phase according to the position information of the rotor, thereby realizing switching the connection state of the three-phase winding while the motor keeps operating, and being beneficial to improving the temperature stability of the air conditioner.
Referring to fig. 14, fig. 14 is a schematic diagram of an air conditioner according to an embodiment of the present invention. The air conditioner according to the embodiment of the present invention includes one or more processors 1401 and a memory 1402, and fig. 14 illustrates one processor 1401 and one memory 1402.
The processor 1401 and the memory 1402 may be connected by a bus or other means, and fig. 14 illustrates an example of a bus connection.
The memory 1402, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. Further, memory 1402 may include high-speed random access memory 1402, and may also include non-transitory memory 1402, such as at least one disk storage device, flash memory component, or other non-transitory solid state storage device. In some embodiments, the memory 1402 may optionally include memory 1402 remotely located from the processor 1401, and such remote memory 1402 may be connected to the operation control device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 14 does not constitute a limitation of an air conditioner, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
Non-transitory software programs and instructions required to implement the driving control method applied to the air conditioner in the above-described embodiment are stored in the memory 1402, and when executed by the processor 1401, the driving control method applied to the air conditioner in the above-described embodiment is performed, for example, the method steps 501 to 504 in fig. 5, the method step 601 in fig. 6, the method steps 701 to 702 in fig. 7, the method steps 801 to 803 in fig. 8, the method steps 901 to 903 in fig. 9, and the method steps 1001 to 1003 in fig. 10 described above are performed.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium, which stores computer-executable instructions, which are executed by one or more processors 1401, for example, by one processor 1401 in fig. 14, and can cause the one or more processors 1401 to execute the driving control method in the above-described method embodiment, for example, to execute the above-described method steps 501 to 504 in fig. 5, method step 601 in fig. 6, method steps 701 to 702 in fig. 7, method steps 801 to 803 in fig. 8, method steps 901 to 903 in fig. 9, and method steps 1001 to 1003 in fig. 10.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, 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 includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims (20)

1. A drive control circuit for driving a motor having a rotor and three-phase windings, one end of each of the windings constituting a first three-phase outgoing line group, and the other end of each of the windings constituting a second three-phase outgoing line group, the drive control circuit comprising:
the driving circuit is connected with the second three-phase outgoing line group and used for providing driving voltage for the three-phase windings;
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched to be in star connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched to be in triangular connection;
and a first detection circuit connected to the second three-phase outgoing line group, for detecting a back electromotive voltage generated by the motor during switching of connection states of the three-phase windings, the back electromotive voltage being used to determine positional information of the rotor during switching of connection states of the three-phase windings.
2. The drive control circuit according to claim 1, characterized in that: the back electromotive voltage is used for determining the rotating speed of the rotor in the switching process of the connection state of the three-phase winding, and the rotating speed is used for determining the position information of the rotor in the switching process of the connection state of the three-phase winding.
3. The drive control circuit according to claim 1, characterized in that: the three-phase winding driving circuit comprises a driving circuit, a driving circuit and a second detection circuit, wherein the driving circuit is used for supplying driving voltage to the three-phase winding, the driving circuit is used for outputting a driving voltage to the three-phase winding, the phase current is used for determining position information of the rotor when the three-phase winding is in a star connection state or a delta connection state, and the second detection circuit is connected with the second three-.
4. The drive control circuit according to claim 1, characterized in that: the first switch group comprises a first switch and a second switch, the first three-phase outgoing line group comprises a first pin, a second pin and a third pin, the first switch is respectively connected with the first pin and the second pin, and the second switch is respectively connected with the second pin and the third pin.
5. The drive control circuit according to claim 1, characterized in that: the first switch group comprises a first switch, a second switch and a third switch, the first three-phase outgoing line group comprises 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 with each other, and the other ends of the first switch, the second switch and the third switch are respectively and correspondingly connected with the first pin, the second pin and the third pin.
6. The drive control circuit according to claim 1, characterized in that: the second switch group comprises a fourth switch, a fifth switch and a sixth switch, the first three-phase outgoing line group comprises a first pin, a second pin and a third pin, the second three-phase outgoing line group comprises a fourth pin, a fifth pin and a sixth pin, the fourth switch is respectively connected with the second pin and the sixth pin, the fifth switch is respectively connected with the third pin and the fifth pin, and the sixth switch is respectively connected with the first pin and the fourth pin.
7. The drive control circuit according to claim 6, characterized in that: the back-emf voltage comprises a first voltage, a second voltage, and a third voltage; the first detection circuit comprises a first detection end, a second detection end and a third detection end, the first detection end is used for detecting the first voltage output by the sixth pin, the second detection end is used for detecting the second voltage output by the fifth pin, the third detection end is used for detecting the third voltage output by the fourth pin, the first detection end is connected with the sixth pin, the second detection end is connected with the fifth pin, and the third detection end is connected with the fourth pin.
8. The drive control circuit according to claim 6, characterized in that: the back-emf voltage comprises a first voltage, a second voltage, and a third voltage; the first detection circuit comprises a first detection end and a second detection end, the first detection end is used for detecting back electromotive force voltages output by any two of a sixth pin, a fifth pin and a 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 and correspondingly connected with any two of the sixth pin, the fifth pin and the fourth pin.
9. The drive control circuit according to claim 1, characterized in that:
the driving circuit comprises a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel, the first bridge arm, the second bridge arm and the third bridge arm respectively comprise two power switching tubes which are connected in series, and diodes are connected on the power switching tubes in a reverse parallel mode.
10. The drive control circuit according to claim 1, characterized in that: the power supply assembly is connected with the driving circuit.
11. A drive control method applied to a drive control circuit for driving a motor having a rotor and three-phase windings, one end of each of the windings constituting a first three-phase outgoing line group, and the other end of each of the windings constituting a second three-phase outgoing line group, the drive control circuit comprising:
the driving circuit is connected with the second three-phase outgoing line group;
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched to be in star connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched to be in triangular connection;
the first detection circuit is connected with the second three-phase outgoing line group;
the drive control method includes:
controlling the driving circuit to stop working, and controlling the switch assembly to be switched on and off so as to enable the three-phase winding to be switched over in a connection state;
acquiring back electromotive voltage generated by the motor in the process of switching the connection state of the three-phase winding through the first detection circuit;
determining position information of the rotor in the switching process of the connection state of the three-phase winding according to the back electromotive voltage;
and controlling the driving circuit to provide driving voltage of a corresponding phase to the three-phase winding which completes the connection state switching according to the position information of the rotor in the three-phase winding connection state switching process.
12. The drive control method according to claim 11, wherein the drive control circuit further includes a second detection circuit that connects the second three-phase outgoing line group, the drive control method further comprising:
obtaining, by the second detection circuit, a phase current output in a state where the drive circuit supplies a drive voltage to the three-phase winding;
determining position information of the rotor when the three-phase winding is in the star connection state or the delta connection state according to the phase current;
and controlling the driving circuit to provide driving voltage of 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 state or the delta connection state.
13. The drive control method according to claim 12, characterized in that:
in 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 voltage;
and after the connection state of the three-phase winding is switched, the position information of the rotor is obtained according to the phase current.
14. The driving control method according to claim 11, wherein the second three-phase outgoing line group includes a fourth pin, a fifth pin, and a sixth pin, the first detection circuit includes a first detection terminal, a second detection terminal, and a third detection terminal, the first detection terminal is connected to the sixth pin, the second detection terminal is connected to the fifth pin, the third detection terminal is connected to the fourth pin, and the obtaining, by the first detection circuit, a back electromotive voltage generated by the motor during switching of the connection state of the three-phase winding includes:
and acquiring 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.
15. The driving control method according to claim 11, wherein the second three-phase outgoing line group includes a fourth pin, a fifth pin, and a sixth pin, the first detection circuit includes a first detection terminal and a second detection terminal, the first detection terminal and the second detection terminal are respectively connected to any two pins of the sixth pin, the fifth pin, and the fourth pin, and the obtaining, by the first detection circuit, a back electromotive voltage generated by the motor during switching of the connection state of the three-phase winding includes:
and acquiring a first voltage detected by the first detection end and a second voltage detected by the second detection end.
16. The drive control method according to claim 11, wherein the determining of the position information of the rotor during the switching of the connection state of the three-phase windings based on the back electromotive force voltage includes:
obtaining the rotating speed of the rotor according to the counter potential voltage;
obtaining the displacement of the rotor according to the integral of the rotating speed of the motor;
and determining the position information of the rotor according to the displacement of the rotor.
17. The drive control method according to claim 16, wherein the deriving the rotation speed of the rotor from the back electromotive voltage includes:
converting the counter electromotive voltage into a first voltage vector and a second voltage vector under a two-phase static coordinate system;
obtaining a counter potential amplitude according to the first voltage vector and the second voltage vector;
and obtaining the rotating speed of the rotor according to the counter potential amplitude.
18. A circuit board, characterized by: comprising a drive control circuit according to any of claims 1 to 10.
19. An air conditioner, characterized in that:
comprising the wiring board of claim 18;
alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a drive control method according to any one of claims 11 to 17.
20. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the drive control method according to any one of claims 11 to 17.
CN202010300526.7A 2020-04-16 2020-04-16 Drive control circuit, drive control method, circuit board and air conditioner Pending CN111355419A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010300526.7A CN111355419A (en) 2020-04-16 2020-04-16 Drive control circuit, drive control method, circuit board and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010300526.7A CN111355419A (en) 2020-04-16 2020-04-16 Drive control circuit, drive control method, circuit board and air conditioner

Publications (1)

Publication Number Publication Date
CN111355419A true CN111355419A (en) 2020-06-30

Family

ID=71194900

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010300526.7A Pending CN111355419A (en) 2020-04-16 2020-04-16 Drive control circuit, drive control method, circuit board and air conditioner

Country Status (1)

Country Link
CN (1) CN111355419A (en)

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