CN111355420B - Motor drive control circuit, motor drive method, circuit board and air conditioner - Google Patents

Motor drive control circuit, motor drive method, circuit board and air conditioner Download PDF

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Publication number
CN111355420B
CN111355420B CN202010301087.1A CN202010301087A CN111355420B CN 111355420 B CN111355420 B CN 111355420B CN 202010301087 A CN202010301087 A CN 202010301087A CN 111355420 B CN111355420 B CN 111355420B
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China
Prior art keywords
switch
controlling
phase winding
inversion module
module
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Application number
CN202010301087.1A
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Chinese (zh)
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CN111355420A (en
Inventor
曾贤杰
黄招彬
赵鸣
文先仕
龙谭
胡斌
张杰楠
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202010301087.1A priority Critical patent/CN111355420B/en
Publication of CN111355420A publication Critical patent/CN111355420A/en
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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
    • 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
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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

Abstract

The application discloses a motor drive control circuit, a drive method, a circuit board and an air conditioner, wherein the motor drive control circuit comprises a switch component, a first inversion module and a second inversion module, three-phase windings of a motor can be switched among a first star connection, a second star connection and an open winding connection through the switching of the switch component, the first inversion module provides a first drive voltage for the three-phase windings in the second star connection state or provides a third drive voltage for the three-phase windings in the open winding connection state, and the second inversion module provides a second drive voltage for the three-phase windings in the first star connection state and provides a fourth drive voltage for the three-phase windings in the open winding connection state; aiming at different three-phase winding connection modes, the first inversion module and the second inversion module provide different power supply voltages, so that the power supply voltages are matched with the three-phase winding connection modes, the energy loss in the inversion conversion process is reduced, and the running efficiency of the motor under different frequencies is improved.

Description

Motor drive control circuit, motor drive method, circuit board and air conditioner
Technical Field
The application relates to the technical field of motor drive control, in particular to a motor drive control circuit, a motor drive method, a circuit board and an air conditioner.
Background
The compressor of current inverter air conditioner adopts inverter motor drive more, generally speaking, inverter air conditioner needs to switch between low middle-high frequency's operating condition according to current ambient temperature, often need switch inverter motor's three-phase winding's connected mode simultaneously in the switching, for example, star connection's three-phase winding switches into open winding when inverter motor gets into high frequency work and connects, however direct current bus voltage can't satisfy inverter motor driving voltage demand when different connected modes simultaneously, can't realize inverter motor homoenergetic high-efficient operation under different connected modes.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a motor drive control circuit, a motor drive method, a circuit board and an air conditioner, which can provide different drive voltages for different three-phase winding wiring modes so as to improve the operating efficiency of the variable frequency motor under different frequencies.
A motor drive control circuit according to an embodiment of a first aspect of the present application, for driving a motor having three-phase windings, one end of each of which constitutes a first three-phase lead line group, and the other end of each of which constitutes a second three-phase lead line group, includes:
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase lead-out wire group, the second switch group is connected with the second three-phase lead-out wire group, the first switch group is closed, the second switch group is opened, the three-phase winding is switched to be in first star connection, the first switch group is opened, the second switch group is closed, the three-phase winding is switched to be in second star connection, the first switch group is opened, the second switch group is opened, and the three-phase winding is switched to be in on-winding connection;
the first inversion module is connected with the first three-phase lead-out wire group and used for providing a first driving voltage for the three-phase winding in a second star connection state or providing a third driving voltage for the three-phase winding in an open winding connection state;
the second inversion module is connected with the second three-phase lead-out wire group and used for providing a second driving voltage for the three-phase winding in the first star connection state and providing a fourth driving voltage for the three-phase winding in the open winding connection state;
the first power supply circuit is connected with the first inversion module to provide a first power supply voltage;
and the second power supply circuit is connected with the second inverter module to provide a second power supply voltage.
According to the motor drive control circuit of the embodiment of the first aspect of the application, at least the following advantages are provided: through the switching of control switch subassembly, three-phase winding can be at first star connection, the second star connection switches between the winding connection with opening, to different three-phase winding connected mode, first contravariant module and second contravariant module provide different supply voltage, for example, three-phase winding switches to first star connection, provide second drive voltage by the second contravariant module, switch to the second star connection when three-phase winding, then second contravariant module stops the power supply, change and provide first drive voltage by first contravariant module, can make supply voltage match in current three-phase winding connected mode through above-mentioned mode, thereby reduce the energy loss of voltage in the contravariant conversion process, make the motor homoenergetic high-efficiently operate under different connected modes.
According to some embodiments of the first aspect of the present application, the first power supply circuit and the second power supply circuit are connected in common.
Some embodiments according to the first aspect of the present application further include a first capacitor connected in parallel between the first power supply circuit and the first inverter module, and a second capacitor connected in parallel between the second power supply circuit and the second inverter module.
According to some embodiments of the first aspect of the present application, the power supply further comprises a rectifier bridge, an input end of the rectifier is connected to the alternating current input end, and a positive output end of the rectifier bridge is connected to an input end of the first power supply circuit and an input end of the second power supply circuit.
According to some embodiments of the first aspect of the present application, the first power supply circuit is a boost circuit.
According to some embodiments of the first aspect of the present application, the second power supply circuit is a voltage step-down circuit.
According to some embodiments of the first aspect of the present application, the boost circuit includes a first inductor, a third switching device, a fourth freewheeling device, and a first capacitor, the first inductor, the third switching device, and the first capacitor are sequentially connected to a ground, the first inductor, the fourth freewheeling device, and the ground are sequentially connected to a ground, and a connection point of the third switching device and the first capacitor is connected to the first inverter module.
According to some embodiments of the first aspect of the present application, the voltage reduction circuit includes a fifth switching device, a sixth freewheeling device, a second inductor and a second capacitor, the fifth switching device, the second inductor and the second capacitor are sequentially connected with reference, the fifth switching device, the sixth freewheeling device and the reference are sequentially connected, and a connection point of the second inductor and the second capacitor is connected to the second inverter module.
According to some embodiments of the first aspect of the present application, the first switch group includes a first switch and a second switch, the first three-phase lead-out wire group includes a first pin, a second pin and a third pin, the first switch is connected to the first pin and the second pin, respectively, and the second switch is connected to the second pin and the third pin, respectively.
According to some embodiments of the first aspect of the present application, the first switch group includes a fifth switch, a sixth switch, and a seventh switch, the first three-phase lead-out wire group includes a first pin, a second pin, and a third pin, one end of the fifth switch is connected to the first pin, one end of the sixth switch is connected to the second pin, one end of the seventh switch is connected to the third pin, and the other end of the fifth switch, the other end of the sixth switch, and the other end of the seventh switch are shorted.
According to some embodiments of the first aspect of the present application, the second switch group includes a third switch and a fourth switch, the second three-phase lead-out wire group includes a fourth pin, a fifth pin and a sixth pin, the third switch is connected to the fourth pin and the fifth pin, respectively, and the fourth switch is connected to the fifth pin and the sixth pin, respectively.
According to some embodiments of the first aspect of the present application, the second switch group includes an eighth switch, a ninth switch, and a tenth switch, the second three-phase lead-out wire group includes a fourth pin, a fifth pin, and a sixth pin, one end of the eighth switch is connected to the fourth pin, one end of the ninth switch is connected to the fifth pin, one end of the tenth switch is connected to the sixth pin, and the other end of the eighth switch, the other end of the ninth switch, and the other end of the tenth switch are shorted.
The driving method according to the embodiment of the second aspect of the present application is applied to a motor drive control circuit for driving a motor having three-phase windings, one end of each of the windings constituting a first three-phase lead-out line group, and the other end of each of the windings constituting a second three-phase lead-out line group, the motor drive control circuit including:
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase lead-out wire group, the second switch group is connected with the second three-phase lead-out wire group, the first switch group is closed, the second switch group is opened, the three-phase winding is switched to be in first star connection, the first switch group is opened, the second switch group is closed, the three-phase winding is switched to be in second star connection, the first switch group is opened, the second switch group is opened, and the three-phase winding is switched to be in on-winding connection;
the first inversion module is connected with the first three-phase lead-out wire group;
the second inversion module is connected with the second three-phase lead-out wire group;
the first power supply circuit is connected with the first inversion module to provide a first power supply voltage;
the second power supply circuit is connected with the second inverter module to provide a second power supply voltage;
the driving method includes:
controlling opening and closing of the switching assembly to switch the three-phase winding between the first star connection and the second star connection or between the second star connection and the open winding connection;
and controlling the first inversion module and the second inversion module to start or stop working so as to enable the first inversion module or the second inversion module to provide driving voltage for the three-phase winding in a corresponding connection state.
According to the driving method of the embodiment of the second aspect of the present application, at least the following advantages are provided: through the switching of control switch subassembly, three-phase winding can be at first star connection, the second star connection switches between the winding connection with opening, to different three-phase winding connected mode, first contravariant module and second contravariant module provide different supply voltage, for example, three-phase winding switches to first star connection, provide second drive voltage by the second contravariant module, switch to the second star connection when three-phase winding, then second contravariant module stops the power supply, change and provide first drive voltage by first contravariant module, can make supply voltage match in current three-phase winding connected mode through above-mentioned mode, thereby reduce the energy loss of voltage in the contravariant conversion process, make the motor homoenergetic high-efficiently operate under different connected modes.
According to some embodiments of the second aspect of the present application, the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module provides a driving voltage to the three-phase winding in a corresponding connection state includes:
and controlling the first inversion module to start working, and controlling the second inversion module to stop working so that the first inversion module provides a first driving voltage for the three-phase winding in the second star connection state.
According to some embodiments of the second aspect of the present application, the controlling the first inverter module to start operating and the second inverter module to stop operating so that the first inverter module provides the first driving voltage to the three-phase winding in the second wye connection state includes:
controlling the first inversion module to output a neutral point voltage of the three-phase winding in the first star connection state;
controlling the first switch set to be switched off, and maintaining the voltage value output by the first inversion module within a first time threshold, wherein the first time threshold is greater than the switching-off duration of the first switch set;
controlling the first inversion module to output the first driving voltage, and controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be closed, and maintaining the voltage value output by the second inversion module within a second time threshold, wherein the second time threshold is greater than the closing duration of the second switch group;
and controlling the second inversion module to stop working.
According to some embodiments of the second aspect of the present application, the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module provides a driving voltage to the three-phase winding in a corresponding connection state includes:
and controlling the second inversion module to start working, and controlling the first inversion module to stop working so as to enable the second inversion module to provide a second driving voltage for the three-phase winding in the first star connection state.
According to some embodiments of the second aspect of the present application, the controlling the second inverter module to start operating and the first inverter module to stop operating so that the second inverter module provides a second driving voltage to the three-phase winding in the first star connection state includes:
controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be switched off, and maintaining the voltage value output by the second inversion module within a third time threshold, wherein the third time threshold is greater than the switching-off duration of the second switch group;
controlling the second inversion module to output the second driving voltage, and controlling the first inversion module to output a neutral point voltage of the three-phase winding in the first star connection state;
controlling the first switch group to be closed, and maintaining the voltage value output by the first inversion module within a fourth time threshold, wherein the fourth time threshold is greater than the closing duration of the first switch group;
and controlling the first inversion module to stop working.
According to some embodiments of the second aspect of the present application, the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module provides a driving voltage to the three-phase winding in a corresponding connection state includes:
and controlling the second inversion module to start working so that the first inversion module provides a third driving voltage for the three-phase winding in the open winding connection state and the second inversion module provides a fourth driving voltage for the three-phase winding in the open winding connection state.
According to some embodiments of the second aspect of the present application, controlling the second inverter module to start operating such that the first inverter module supplies a third driving voltage to the three-phase winding in the open-winding connected state and the second inverter module supplies a fourth driving voltage to the three-phase winding in the open-winding connected state includes:
controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be switched off, and maintaining the voltage value output by the second inversion module within a fifth time threshold, wherein the fifth time threshold is greater than the switching-off duration of the second switch group;
and controlling the first inversion module to output the first driving voltage, and controlling the second inversion module to output the second driving voltage.
According to some embodiments of the second aspect of the present application, the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module provides a driving voltage to the three-phase winding in a corresponding connection state includes:
and controlling the second inversion module to stop working so that the first inversion module provides a first driving voltage for the three-phase winding in the second star connection state.
According to some embodiments of the second aspect of the present application, controlling the second inverter module to stop operating so that the first inverter module supplies the first driving voltage to the three-phase winding in the second wye connection state includes:
controlling the first inversion module to output the first driving voltage, and controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be closed, and maintaining the voltage value output by the second inversion module within a sixth time threshold, wherein the sixth time threshold is greater than the disconnection duration of the second switch group;
and controlling the second inversion module to stop working.
According to some embodiments of the second aspect of the present application, controlling opening and closing of the switching assembly to switch the three-phase winding between the first star connection and the second star connection or between the second star connection and the open-winding connection comprises:
when the operating frequency of the motor is lower than a first frequency threshold value, controlling the opening and closing of the switch assembly to enable the three-phase winding to be switched from the second star connection to the first star connection;
when the operating frequency of the motor is higher than the first frequency threshold and lower than a second frequency threshold, controlling the opening and closing of the switch assembly to switch the three-phase winding from the first star connection to the second star connection;
when the operating frequency of the motor is higher than the second frequency threshold, controlling the opening and closing of the switch assembly to switch the three-phase winding from a second star connection to an open winding connection.
A wiring board according to an embodiment of the third aspect of the present application includes the motor drive control circuit according to any one of the above first aspects.
According to the circuit board of the third aspect of the present application, at least the following beneficial effects are achieved: integrate motor drive control circuit on the circuit board, be convenient for install on frequency conversion equipment, switching through control switch subassembly, three-phase winding can be in first star connection, second star connection and open and switch between the winding connection, to different three-phase winding connected mode, first contravariant module and second contravariant module provide different supply voltage, for example, three-phase winding switches to first star connection, provide second driving voltage by second contravariant module, switch to second star connection when three-phase winding, then second contravariant module stops the power supply, change and provide first driving voltage by first contravariant module, can make supply voltage match in current three-phase winding connected mode through above-mentioned mode, thereby reduce the energy loss of voltage in the contravariant conversion process, make the motor homoenergetic high-efficient operation under different connected mode.
An air conditioner according to a fourth aspect embodiment of the present application includes the wiring board as described in the above 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 method of driving according to any one of the second aspects above.
According to the air conditioner of the fourth aspect of the present application, at least the following advantages are provided: the air conditioner is provided with a circuit board integrated with a motor drive control circuit, or a corresponding drive method is directly executed through a processor, so that the function of the motor drive control circuit is realized, the three-phase winding can be switched among a first star connection, a second star connection and an open winding connection by controlling the opening and closing of a switch component, aiming at different three-phase winding connection modes, a first inversion module and a second inversion module provide different power supply voltages, for example, the three-phase winding is switched to the first star connection, the second inversion module provides a second drive voltage, when the three-phase winding is switched to the second star connection, the second inversion module stops supplying power, the first inversion module provides the first drive voltage, the power supply voltage can be matched with the current three-phase winding connection mode through the mode, and the energy loss of the voltage in the inversion conversion process is reduced, the motor can run efficiently under different connection modes.
A computer-readable storage medium according to an embodiment of the fifth aspect of the present application stores computer-executable instructions for causing a computer to perform the driving method according to any one of the above second aspects.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application 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 circuit diagram of a motor drive control circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a motor drive control circuit according to another embodiment of the present application;
FIG. 3 is an equivalent circuit diagram of a first star connection provided by one embodiment of the present application;
FIG. 4 is an equivalent circuit diagram of a second star connection provided by one embodiment of the present application;
FIG. 5 is an equivalent circuit diagram of an open winding connection provided by one embodiment of the present application;
fig. 6 is a circuit diagram of a motor drive control circuit according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a control device according to an embodiment of the present application;
FIG. 8 is a flow chart of a driving method provided in an embodiment of the present application;
fig. 9 is a flowchart of a driving method according to another embodiment of the present application;
fig. 10 is a flowchart of a driving method according to another embodiment of the present application;
fig. 11 is a flowchart of a driving method according to another embodiment of the present application;
fig. 12 is a flowchart of a driving method according to another embodiment of the present application;
fig. 13 is a flowchart of a driving method according to another embodiment of the present application;
fig. 14 is an operation control diagram of a driving method according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, 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 drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. 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 application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
The motor with the switchable connection mode usually adopts a single power supply for power supply, and after alternating current input is rectified, the output direct current voltage is determined, so that the driving circuit can only adjust the voltage through the inverter to output a proper driving voltage.
Based on this, the application provides a motor drive control circuit, a driving method, a circuit board and an air conditioner, and two different power supply voltages are obtained by arranging two different voltage conversion circuits, so that energy loss in the inversion conversion process is reduced, and the operation efficiency of the motor is improved.
As is well known to those skilled in the art, an open-winding motor has six terminals led out from three windings, the three windings include a first phase winding, a second phase winding and a third phase winding to form a three-phase power supply, each winding includes two terminals, namely, a first pin and a sixth pin are led out from two ends of the first phase winding respectively, a second pin and a fifth pin are led out from two ends of the second phase winding respectively, and a third pin and a fourth pin are led out from two ends of the third phase winding respectively, so that the first pin, the second pin and the third pin form a three-phase lead-out wire on one side of the open-winding motor, the fourth pin, the fifth pin and the sixth pin form a three-phase lead-out wire on the other side of the open-winding motor, and the three-phase lead-out wires on two sides of the open-winding motor are connected through two inverter modules to drive the open-winding motor.
The embodiments of the present application will be further explained with reference to the drawings.
Referring to fig. 1, fig. 1 is a circuit diagram of a motor drive control circuit provided in a first aspect of an embodiment of the present application, the motor drive control circuit being configured to drive an open-winding motor having three-phase windings 100, one end of each phase winding constituting a first three-phase lead-out line group 110, and the other end of each phase winding constituting a second three-phase lead-out line group 120, the motor drive control circuit including:
the three-phase winding comprises a switch assembly and a control circuit, wherein the switch assembly comprises a first switch group KY1 and a second switch group KY2, the first switch group KY1 is connected with a first three-phase lead-out line group 110, the second switch group KY2 is connected with a second three-phase lead-out line group 120, the first switch group KY1 is closed, the second switch group KY2 is opened, the three-phase winding 100 is switched to be in first star connection, the first switch group KY1 is opened, the second switch group KY2 is closed, the three-phase winding 100 is switched to be in second star connection, the first switch group KY1 is opened, the second switch group KY2 is opened, and the three-phase winding 100 is switched to be in open winding connection;
a first inversion module, connected to the first three-phase outgoing line group 110, for providing a first driving voltage to the three-phase winding 100 in the second star connection state or providing a third driving voltage to the three-phase winding 100 in the open winding connection state;
a second inverter module, connected to the second three-phase outgoing line group 120, for providing a second driving voltage to the three-phase winding 100 in the first star connection state and providing a fourth driving voltage to the three-phase winding 100 in the open winding connection state;
the first power supply circuit is connected with the first inversion module to provide a first power supply voltage;
and the second power supply circuit is connected with the second inverter module to provide a second power supply voltage.
In the present embodiment, the first inverter module and the second inverter module are respectively connected to the first three-phase lead-out line group 110 and the second three-phase lead-out line group 120 to form an open winding connection, in order to realize the switching of the connection modes, the first switch group KY1 and the second switch group KY2 are arranged on the first three-phase lead-out line group 110 and the second three-phase lead-out line group 120, the three-phase winding 100 is switched to the first star connection by closing the first switch group KY1 and opening the second switch group KY2, the three-phase winding 100 is switched to the second star connection by opening the first switch group KY1 and closing the second switch group KY2, and the three-phase winding 100 is switched to the open winding connection by opening the first switch group KY1 and the second switch group KY 2; there are various embodiments of the structure and connection manner of the first switch group KY1 and the second switch group KY2, in one embodiment, the first switch group KY1 includes a first switch and a second switch, the three-phase winding 100 includes a first phase winding, a second phase winding and a third phase winding 100, pins of the three are led out of the motor, a first pin M1 and a sixth pin M6 are led out from two ends of the first phase winding respectively, a second pin M2 and a fifth pin M5 are led out from two ends of the second phase winding respectively, a third pin M3 and a fourth pin M4 are led out from two ends of the third phase winding 100 respectively, based on that, the first three-phase lead-out line group 110 includes a first pin M1, a second pin M2 and a third pin M3, the second three-phase lead-out line group 120 includes a fourth pin M4, a fifth pin M5 and a sixth pin M6, the first switch is connected with the first pin M1 and the second pin M2, and the third pin M3, when the first switch and the second switch are simultaneously closed and the second switch group K Y2 is open, the first pin M1, the second pin M2, and the third pin M3 are connected to each other such that the three-phase winding 100 is in a first star connection state, as shown in fig. 3; similarly, the second switch group KY2 includes a third switch and a fourth switch, the third switch is respectively connected to the fourth pin M4 and the fifth pin M5, the fourth switch is respectively connected to the fifth pin M5 and the sixth pin M6, when the third switch and the fourth switch are simultaneously turned on and the first switch group KY1 is turned off, the fourth pin M4, the fifth pin M5 and the sixth pin M6 are connected to each other, so that the three-phase winding 100 is in a second star connection state, as shown in fig. 4; as for the open winding connection state, it is sufficient to open the first switch, the second switch, the third switch, and the fourth switch, as shown in fig. 5.
The first switch group KY1 and the second switch group KY2 may have the following structure in addition to the above-described specific structure: referring to fig. 6, the first switch group KY1 includes a fifth switch, a sixth switch and a seventh switch, one end of the fifth switch is connected to the first pin M1, one end of the sixth switch is connected to the second pin M2, one end of the seventh switch is connected to the third pin M3, the other end of the fifth switch, the other end of the sixth switch and the other end of the seventh switch are short-circuited, and the first pin M1, the second pin M2 and the third pin M3 are connected to each other by closing the first switch group KY 1; similarly, the second switch group KY2 includes an eighth switch, a ninth switch and a tenth switch, one end of the eighth switch is connected to the fourth pin M4, one end of the ninth switch is connected to the fifth pin M5, one end of the tenth switch is connected to the sixth pin M6, the other end of the eighth switch, the other end of the ninth switch and the other end of the tenth switch are short-circuited, and the fourth pin M4, the fifth pin M5 and the sixth pin M6 can be connected to each other by closing the second switch group KY 2.
It is to be understood that the first to tenth switches may be discrete components or integrated on a single component, for example, the first and second switches are electromagnetic relays, contactors, solid state relays, or electronic switches having on-resistance of not more than 1 ohm, respectively; for another example, the first switch and the second switch are integrated on a rotary switch, and the first switch and the second switch can be simultaneously turned on and off by rotating the rotary switch; the realization mode of the first switch group KY1 and the second switch group KY2 is more, different switch forms have different switch time, different switch forms can be selected according to the response requirement of the motor drive control circuit, and redundant description is not repeated here. The first inverter Module and the second inverter Module may be Module circuits formed by discrete devices in terms of type selection, for example, the first Power Module PM1 is a three-phase bridge inverter circuit formed by six switching devices, at this time, the switching devices may be IGBT devices, MOSFETs made of Si material, MOSFETs made of SiO material, or MOSFETs made of GaN material, and the first Power Module PM1 may also be an integrated packaged Intelligent Power Module, for example, an IPM Module (Intelligent Power Module), and may also implement the function of inverter conversion.
For example, referring to fig. 2, the first power supply circuit may be a boost circuit composed of a switching device, a capacitor, and an inductor, and may implement boost conversion, and the second power supply circuit may be a buck circuit composed of a switching device, a capacitor, and an inductor, and may implement buck conversion, and for example, the voltage conversion chip may enable the voltage conversion chip to output voltages of different magnitudes by controlling an input voltage of an enable terminal or a voltage feedback terminal of the voltage conversion chip, so as to implement voltage conversion; the first power supply circuit and the second power supply circuit are various, and different voltage conversion circuits can be adopted to meet different design requirements, which is not described herein in detail.
It should be noted that, because the voltages output by the first power supply circuit and the second power supply circuit are different, the operating frequencies of the motors corresponding to the first star connection and the second star connection are different, when the motor works at a lower frequency, the first star connection can be adopted, and at this time, the second inverter module with a lower power supply voltage is connected to the motor; when the frequency of the motor rises, the first star connection can be switched into the second star connection, and the first inverter module with higher supply voltage is connected to the motor; when the frequency of the motor continues to rise, the connection of the open winding can be switched, and the first inversion module and the second inversion module are connected to the motor. The embodiment changes the driving voltage of the motor by switching the access of the inverter module, thereby matching the operating frequency of the motor, reducing the loss caused by the voltage conversion in the inverter module and improving the operating efficiency of the motor.
Referring to fig. 2, in an embodiment, the first power supply circuit and the second power supply circuit are commonly connected. The existing dual-power circuit design usually needs to isolate two power supplies so as to avoid the mutual interference of the two power supplies, thus the design cost of the power supply is increased, the selection of the power supplies is also strict, the first power supply circuit and the second power supply circuit of the embodiment adopt a common-ground connection mode, an isolation circuit is not needed to be arranged, and the circuit cost is reduced.
Referring to fig. 1, in an embodiment, the inverter further includes a first capacitor connected in parallel between the first power supply circuit and the first inverter module, and a second capacitor connected in parallel between the second power supply circuit and the second inverter module. The first capacitor and the second capacitor play a role in filtering, and if the first power supply circuit or the second power supply circuit is an inductive load, the first capacitor and the second capacitor can convert the inductive load into a resistive load and play a role in power factor correction.
Referring to fig. 2, in an embodiment, the power supply further includes a rectifier bridge, an input end of the rectifier is connected to the ac input end, and an anode output end of the rectifier bridge is connected to an input end of the first power supply circuit and an input end of the second power supply circuit. In this embodiment, the first power supply circuit and the second power supply circuit receive the dc output of the same power supply, and obtain the first power supply voltage and the second power supply voltage through respective conversion modes, and meanwhile, the device is also convenient to be directly connected to the ac mains supply for use, and no additional power supply is required.
In one embodiment, the first power supply circuit and the second power supply circuit employ a voltage conversion circuit that is at least one of:
the first power supply circuit is a booster circuit;
the second power supply circuit is a voltage reduction circuit;
the first power supply circuit is a boost circuit while the second power supply circuit is a buck circuit.
In the embodiment, a first power supply voltage and a second power supply voltage are obtained by adopting a boosting circuit and a voltage reduction circuit; in the case that the first power supply circuit is a voltage boosting circuit and the second power supply circuit is a voltage reducing circuit, the connection modes of the voltage boosting circuit and the voltage reducing circuit may be different, for example, in the first embodiment, the voltage boosting circuit and the voltage reducing circuit are independently arranged and are respectively connected with the first inverter module and the second inverter module, which is equivalent to the parallel arrangement of the voltage boosting circuit and the voltage reducing circuit, in this embodiment, the voltage boosting circuit and the voltage reducing circuit may be in common or not in common; in a second embodiment, a dc power supply is sequentially connected to a buck circuit and a boost circuit, a voltage of the dc power supply passes through the buck circuit to obtain a second supply voltage, and the second supply voltage is respectively input to the boost circuit and the second inverter module, the boost circuit boosts the second supply voltage to obtain a first supply voltage and inputs the first supply voltage to the first inverter module, which is equivalent to the series arrangement of the boost circuit and the buck circuit, wherein the buck circuit is in front and the boost circuit is in back; in the third embodiment mode, direct current power supply connects gradually boost circuit and buck circuit, and direct current power supply's voltage obtains first supply voltage behind boost circuit, inputs buck circuit and first contravariant module respectively, and buck circuit obtains second supply voltage and inputs second contravariant module after stepping down first supply voltage, is equivalent to boost circuit and buck circuit series connection setting like this, and boost circuit is preceding, and buck circuit is after.
It can be understood that, when the first power supply circuit is a voltage boost circuit, the second power supply circuit is not limited, and may be a common power supply circuit or a filter rectification circuit, as long as the condition that the first power supply voltage is greater than the second power supply voltage is satisfied; similarly, when the second power supply circuit is a voltage reduction circuit, the first power supply circuit is not limited, as long as the condition that the first power supply voltage is greater than the second power supply voltage is met.
Referring to fig. 2, in an embodiment, the boost circuit includes a first inductor L1, a third switching device Q3, a fourth freewheeling device Q4 and a first capacitor C1, the first inductor L1, the third switching device Q3, the first capacitor C1 and the reference ground are sequentially connected, the first inductor L1, the fourth freewheeling device Q4 and the reference ground are sequentially connected, and a connection point of the third switching device Q3 and the first capacitor C1 is connected to the first inverter module. The voltage reduction circuit comprises a fifth switching device Q5, a sixth freewheeling device Q6, a second inductor L2 and a second capacitor C2, wherein the fifth switching device Q5, the second inductor L2 and the second capacitor C2 are sequentially connected with a reference ground, the fifth switching device Q5 and the sixth freewheeling device Q6 are sequentially connected with the reference ground, and the connection point of the second inductor L2 and the second capacitor C2 is connected with the second inverter module.
In this embodiment, the boost circuit is a boost chopper circuit, and the buck circuit is a buck chopper circuit, where in the selection of circuit devices, the third switching device Q3 and the fifth switching device Q5 may be MOSFETs or IGBTs, and the fourth freewheeling device Q4 and the sixth freewheeling device Q6 may be diodes or a combination of switching power transistors and inverse parallel diodes, and because there are many selectable devices, details are not repeated here.
Referring to fig. 7, fig. 7 is a schematic diagram of a control device 700 according to an embodiment of the present application, the control device 700 may be disposed in the motor drive control circuit of the first aspect of the embodiment, or the control device 700 may be disposed based on a motor drive control circuit with another circuit structure, specifically, the control device 700 is connected to the first control terminal and the second control terminal to implement control over the totem pole PFC circuit and the buck switch circuit. It is understood that the control device 700 includes a control processor 701 and a memory 702, and fig. 7 illustrates a control processor 701 and a memory 702.
The control processor 701 and the memory 702 may be connected by a bus or other means, and fig. 7 illustrates an example of a connection by a bus.
The memory 702, 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, the memory 702 may include high-speed random access memory 702, and may also include non-transitory memory 702, such as at least one disk memory 702, flash memory device, or other non-transitory solid state memory 702. In some embodiments, the memory 702 may optionally include memory 702 located remotely from the control processor 701, and these remote memories 702 may be connected to the control device 700 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 device configuration shown in fig. 7 does not constitute a limitation of control device 700 and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
In the motor drive control circuit shown in fig. 1, the control processor 701 may be configured to call up a driver stored in the memory 702 to implement a driving method for the motor drive control circuit.
Various embodiments of the driving method of the second aspect of the embodiments of the present application are proposed based on a motor drive control circuit.
Referring to fig. 8, fig. 8 is a flowchart of a driving method provided in a second aspect of an embodiment of the present application, where the driving method is applied to a motor driving control circuit, the motor driving control circuit is used for driving a motor having a three-phase winding 100, the three-phase winding 100 includes a first three-phase lead-out line group 110 and a second three-phase lead-out line group 120, and the motor driving control circuit includes:
the three-phase winding comprises a switch assembly and a control circuit, wherein the switch assembly comprises a first switch group KY1 and a second switch group KY2, the first switch group KY1 is connected with a first three-phase lead-out line group 110, the second switch group KY2 is connected with a second three-phase lead-out line group 120, the first switch group KY1 is closed, the second switch group KY2 is opened, the three-phase winding 100 is switched to be in first star connection, the first switch group KY1 is opened, the second switch group KY2 is closed, the three-phase winding 100 is switched to be in second star connection, the first switch group KY1 is opened, the second switch group KY2 is opened, and the three-phase winding 100 is switched to be in open winding connection;
a first inversion module connected to the first three-phase lead-out line group 110;
a second inverter module connected to the second three-phase lead-out line group 120;
the first power supply circuit is connected with the first inversion module to provide a first power supply voltage;
the second power supply circuit is connected with the second inversion module to provide a second power supply voltage;
the driving method comprises the following steps:
s801, controlling the switching of the switching assembly to switch the three-phase winding 100 between the first star connection and the second star connection or between the second star connection and the open winding connection;
and S802, controlling the first inversion module and the second inversion module to start or stop working so that the first inversion module or the second inversion module provides driving voltage for the three-phase winding 100 in the corresponding connection state.
The object to which the above-mentioned driving control method is applied is based on the motor driving control circuit of the second aspect of the embodiment of the present application, and since the motor driving control circuit of the first aspect of the embodiment of the present application has already described a circuit structure in detail, in order to avoid repeated description, the motor driving control circuit of the first aspect of the embodiment of the present application is taken as an example to describe a driving method in detail below, and it should be understood that this does not limit that the driving method of the second aspect of the embodiment of the present application can only be applied to the motor driving control circuit of the first aspect.
Referring to fig. 1, the connection mode of the three-phase winding 100 can be switched by switching the switch assembly, the three-phase winding 100 enters different connection modes, the access inversion modules are also different, only the second inversion module is accessed in the first star connection state, only the first inversion module is accessed in the second star connection state, both the first inversion module and the second inversion module are accessed in the open winding connection state, and the connection mode matched with the change of the motor frequency can be obtained according to the size of the driving voltage because the driving voltage provided by the first inversion module and the second inversion module is different, so that the operation efficiency of the motor under different operation frequencies is improved. The driving method in each connection state is described in detail below.
The first star connection is switched to the second star connection:
in one embodiment, step S802 includes:
and controlling the first inverter module to start working and controlling the second inverter module to stop working so that the first inverter module provides the first driving voltage to the three-phase winding 100 in the second star connection state.
In this embodiment, referring to fig. 9, a switching manner of a first star connection to a second star connection, specifically, controlling a first inverter module to start operating and a second inverter module to stop operating so that the first inverter module provides a first driving voltage to a three-phase winding 100 in a second star connection state includes:
s901, controlling the first inversion module to output neutral point voltage of the three-phase winding 100 in a first star connection state;
s902, controlling the first switch group KY1 to be turned off, and maintaining the voltage value output by the first inverter module within a first time threshold, where the first time threshold is greater than the turn-off duration of the first switch group KY 1;
s903, controlling the first inverter module to output a first driving voltage, and controlling the second inverter module to output a neutral point voltage of the three-phase winding 100 in a second star connection state; (ii) a
S904, controlling the second switch group KY2 to close, and maintaining the voltage value output by the second inverter module within a second time threshold, where the second time threshold is greater than the closing duration of the second switch group KY 2;
and S905, controlling the second inversion module to stop working.
Referring to fig. 1, since the first switch group KY1 and the second switch group KY2 are mechanical switches, there is a certain switching time, and in order to ensure stable operation of the motor in the switching process, it is necessary to ensure that the circuit can be transited stably in the process of opening to closing or closing to opening of the first switch group KY1 and the second switch group KY 2. Specifically, before the first switch group KY1 is disconnected, the first inverter module enters a working state to simulate a neutral point voltage in a first star connection state, the first inverter module is equivalent to the first switch group KY1 at the moment, then the first switch group KY1 is disconnected, the first three-phase lead-out wire group 110 of the motor is connected to the first inverter module, and the first three-phase lead-out wire group 110 of the motor is equivalent to be switched from the first switch group KY1 to the first inverter module simulating the first switch group KY1 at the moment; after the first switch group KY1 is completely disconnected, the first inverter module and the second inverter module together simulate neutral point voltage of the second star connection, then the second switch group KY2 is closed to be switched to the second star connection, similarly, in order to ensure that the motor can stably work after being switched, the purpose that the second inverter module simulates the neutral point voltage of the second star connection is to enable the neutral point voltage to be equivalent to the second switch group KY2, stable transition of the switching process is achieved, finally, after the second switch group KY2 is completely closed, the second inverter module stops working, and the motor stably works in the second star connection state at the moment.
It should be noted that the durations of the first time threshold and the second time threshold are set according to the opening and closing durations of the first switch group KY1 and the second switch group KY2, and the durations of the first time threshold and the second time threshold should be ensured not to be less than the duration of the opening and closing action, so as to ensure the stability of the motor in the switching process.
The second star connection is switched to the first star connection:
in one embodiment, step S802 includes:
and controlling the second inverter module to start working, and controlling the first inverter module to stop working, so that the second inverter module provides a second driving voltage to the three-phase winding 100 in the first star connection state.
In this embodiment, referring to fig. 10, the method for switching the second star connection to the first star connection, specifically, controlling the first inverter module to start operating and controlling the second inverter module to stop operating so that the first inverter module provides the first driving voltage to the three-phase winding 100 in the second star connection state includes:
s1001, controlling a second inverter module to output neutral point voltage of the three-phase winding 100 in a second star connection state;
s1002, controlling the second switch group KY2 to be turned off, and maintaining the voltage value output by the second inverter module within a third time threshold, where the third time threshold is greater than the turn-off duration of the second switch group KY 2;
s1003, controlling the second inverter module to output the second driving voltage, and controlling the first inverter module to output a neutral point voltage of the three-phase winding 100 in the first star connection state;
s1004, controlling the first switch group KY1 to close, and maintaining the voltage value output by the first inverter module within a fourth time threshold, where the fourth time threshold is greater than the closing duration of the first switch group KY 1;
and S1005, controlling the first inversion module to stop working.
Contrary to the process of the previous embodiment, in this embodiment, the second inverter module is first operated to simulate the neutral point voltage of the second star connection, so that the second inverter module is equivalent to the second switch group KY2, the second switch group KY2 is turned off at this time, after the second switch group KY2 is completely turned off, the first inverter module and the second inverter module simultaneously simulate the neutral point voltage of the first star connection, then the first switch group KY1 is closed, the output of the first inverter module is maintained for a period of time to completely close the first switch group KY1, and finally the first inverter module is stopped, so that the whole switching process is completed. Similarly, the time lengths of the fourth time threshold and the third time threshold are also set according to the on-off time lengths of the first switch group KY1 and the second switch group KY2, and are not repeated herein.
The second star connection is switched to the open winding connection:
in one embodiment, step S802 includes:
and controlling the second inversion module to start working so that the first inversion module provides a third driving voltage to the three-phase winding 100 in the open winding connection state and the second inversion module provides a fourth driving voltage to the three-phase winding 100 in the open winding connection state.
The present embodiment is a switching process of the second star connection to the open winding connection, and in detail, referring to fig. 11, the controlling the second inverter module to start operating so that the first inverter module supplies the third driving voltage to the three-phase winding 100 in the open winding connection state and the second inverter module supplies the fourth driving voltage to the three-phase winding 100 in the open winding connection state includes:
s1101, controlling the second inverter module to output neutral point voltage of the three-phase winding 100 in a second star connection state;
s1102, controlling the second switch group KY2 to be turned off, and maintaining the voltage value output by the second inverter module within a fifth time threshold, where the fifth time threshold is greater than the turn-off duration of the second switch group KY 2;
s1103, the first inverter module is controlled to output the first driving voltage, and the second inverter module is controlled to output the second driving voltage.
In this embodiment, the second inverter module is operated to simulate a neutral point voltage of the second star connection, at this time, the second inverter module is equivalent to the second switch group KY2, the second switch group KY2 is disconnected, the output of the second inverter module is maintained to wait for the second switch group KY2 to be completely disconnected, and then the first inverter module and the second inverter module simultaneously output a three-phase voltage in an open winding connection state, so that switching can be completed.
The open winding connection is switched to the second star connection:
in one embodiment, step S802 includes:
and controlling the second inverter module to stop working so that the first inverter module supplies the first driving voltage to the three-phase winding 100 in the second star connection state.
The present embodiment is a switching process of connecting an open winding to a second star connection, and in detail, referring to fig. 12, controlling a second inverter module to stop operating so that a first inverter module supplies a first driving voltage to a three-phase winding 100 in a second star connection state includes:
s1201, controlling the first inversion module to output a first driving voltage, and controlling the second inversion module to output a neutral point voltage of the three-phase winding 100 in a second star connection state; (ii) a
S1202, controlling the second switch group KY2 to be closed, and maintaining the voltage value output by the second inverter module within a sixth time threshold, where the sixth time threshold is greater than the off-time of the second switch group KY 2;
and S1203, controlling the second inversion module to stop working.
In contrast to the previous embodiment, in the present embodiment, during switching, the first inverter module and the second inverter module simultaneously change the output to the neutral point voltage of the second star connection, then close the second switch group KY2, and maintain the output of the second inverter module for a period of time to finish closing the second switch group KY2, and finally stop the operation of the second inverter module, thereby completing the switching process.
The four switching processes are mainly characterized in that stable transition of the motor is guaranteed, the motor is equivalent to the switch group and the time threshold is set through the analog voltage value, stable work of the motor in the switching process can be achieved, and the situation that two switch groups are closed simultaneously can be prevented.
Based on the circuit structure that the first power supply circuit is a boost chopper circuit and the second power supply circuit is a buck chopper circuit, the start or stop of the first power supply circuit in the four switching processes is represented as follows: when the high-frequency switch third switching device, the high-frequency switch or the continuous turn-off of the fourth freewheeling device (the fourth freewheeling device is provided with the reverse parallel diode), the first power supply circuit is in a working state, and when the third switching device and the fourth freewheeling device are continuously turned off, the first power supply circuit stops working; likewise, the start or stop of the second power supply circuit appears as: when the fifth switching device is switched on and off at high frequency or the sixth freewheeling device is continuously turned off (the sixth freewheeling device is additionally provided with an antiparallel diode), the second power supply circuit is in an operating state, and when the fifth switching device and the sixth freewheeling device are continuously turned off, the second power supply circuit stops operating.
Referring to fig. 14, fig. 14 illustrates an operation of switching the respective circuit components among the first star connection, the second star connection, and the open-winding connection, where IPM1 and IPM2 respectively represent the first inverter module and the second inverter module. Of course, the working waveform of fig. 14 only represents one implementation manner, and besides the waveform shown in fig. 14, different waveforms (such as changing duty ratios) may also be adopted to implement the scheme of the embodiment of the present application, which is not described herein again.
Referring to fig. 13, in an embodiment, step S801 includes:
s1301, when the operating frequency of the motor is lower than a first frequency threshold, controlling the switching of the switching assembly to switch the three-phase winding 100 from the second star connection to the first star connection;
s1302, when the operating frequency of the motor is higher than a first frequency threshold and lower than a second frequency threshold, controlling the switching of the switching component to switch the three-phase winding 100 from the first star connection to the second star connection;
and S1303, when the working frequency of the motor is higher than a second frequency threshold value, controlling the opening and closing of the switch assembly to switch the three-phase winding 100 from the second star connection to the open winding connection.
According to the four switching processes, the connection mode of the motor is connected from the first star connection to the second star connection to the open winding connection according to the frequency of the motor from low to high, so that the first frequency threshold and the second frequency threshold can be set to control the time for switching the connection mode of the motor, the motor can automatically switch the connection mode according to the working frequency, and the running efficiency of the motor is improved.
A third aspect of an embodiment of the present application provides a circuit board, including the motor driving control circuit of the first aspect of the embodiments, the motor driving control circuit of the first aspect is carried by way of the circuit board, and can be conveniently installed on an inverter motor to implement driving control, the motor driving control circuit on the circuit board controls the on/off of the switch component, the three-phase winding 100 can be switched among a first star connection, a second star connection, and an open winding connection, for different connection manners of the three-phase winding 100, the first inverter module and the second inverter module provide different power supply voltages, for example, the three-phase winding 100 is switched to the first star connection, the second inverter module provides a second driving voltage, when the three-phase winding 100 is switched to the second star connection, the second inverter module stops supplying power, and the first inverter module provides the first driving voltage instead, by the method, the power supply voltage can be matched with the current connection mode of the three-phase winding 100, so that the energy loss of the voltage in the inversion conversion process is reduced, and the motor can run efficiently in different connection modes.
A fourth aspect of an embodiment of the present application provides an air conditioner including the wiring board of the second aspect as above. The circuit board of the second aspect is installed in an air conditioner to drive a compressor of the air conditioner to work, so as to realize variable frequency control of the air conditioner, wherein a motor drive control circuit on the circuit board controls the on/off of a switch component, the three-phase winding 100 can be switched among a first star connection, a second star connection and an open winding connection, and for different connection modes of the three-phase winding 100, a first inversion module and a second inversion module provide different power supply voltages, for example, the three-phase winding 100 is switched to the first star connection, the second inversion module provides a second drive voltage, when the three-phase winding 100 is switched to the second star connection, the second inversion module stops supplying power, the first inversion module provides the first drive voltage, and the power supply voltage can be matched with the current connection mode of the three-phase winding 100 through the above mode, so as to reduce the energy loss of the voltage in the inversion conversion process, the motor can run efficiently under different connection modes.
Since the air conditioner in the present embodiment has the control device 700 in any of the above embodiments, the air conditioner in the present embodiment has the hardware structure of the control device 700 in the above embodiments, and the control processor 701 in the control device 700 can call the control program of the air conditioner stored in the memory 702 to implement the driving method of the second aspect in the embodiment of the present application.
Furthermore, an embodiment of the present application also provides a computer-readable storage medium storing computer-executable instructions, which are executed by one or more control processors 701, for example, by one control processor 701 in fig. 7, and may cause the one or more control processors 701 to execute a refrigeration method of the refrigeration apparatus in the above-described method embodiment, for example, execute the above-described method steps S801 to S802 in fig. 8, method steps S901 to S905 in fig. 9, method steps S1001 to S1005 in fig. 10, method steps S1101 to S1103 in fig. 11, method steps S1201 to S1203 in fig. 12, and method steps S1301 to S1303 in fig. 13.
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.
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, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.

Claims (20)

1. A motor drive control circuit for driving a motor having three-phase windings, one end of each of the phases of the windings constituting a first three-phase lead-out line group, the other end of each of the phases of the windings constituting a second three-phase lead-out line group, the drive control circuit comprising:
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase lead-out wire group, the second switch group is connected with the second three-phase lead-out wire group, the first switch group is closed, the second switch group is opened, the three-phase winding is switched to be in first star connection, the first switch group is opened, the second switch group is closed, the three-phase winding is switched to be in second star connection, the first switch group is opened, the second switch group is opened, and the three-phase winding is switched to be in on-winding connection;
the first inversion module is connected with the first three-phase lead-out wire group and used for providing a first driving voltage for the three-phase winding in a second star connection state or providing a third driving voltage for the three-phase winding in an open winding connection state;
the second inversion module is connected with the second three-phase lead-out wire group and used for providing a second driving voltage for the three-phase winding in the first star connection state and providing a fourth driving voltage for the three-phase winding in the open winding connection state;
the first power supply circuit is connected with the first inversion module to provide a first power supply voltage;
the second power supply circuit is connected with the second inverter module to provide a second power supply voltage;
the first power supply circuit is a boost circuit, the second power supply circuit is a buck circuit, the boost circuit comprises a first inductor, a third switching device, a fourth freewheeling device and a first capacitor, the first inductor, the third switching device, the first capacitor and a reference ground are sequentially connected, the first inductor, the fourth freewheeling device and the reference ground are sequentially connected, and a connection point of the third switching device and the first capacitor is connected with the first inverter module; the voltage reduction circuit comprises a fifth switching device, a sixth follow current device, a second inductor and a second capacitor, the fifth switching device, the second inductor, the second capacitor and a reference ground are sequentially connected, the fifth switching device, the sixth follow current device and the reference ground are sequentially connected, a connection point of the second inductor and the second capacitor is connected with the second inverter module, and the first power supply circuit and the second power supply circuit are connected with the same input power supply.
2. The motor drive control circuit of claim 1 wherein the first and second power supply circuits are connected in common.
3. The motor drive control circuit of claim 1 further comprising a first capacitor connected in parallel between the first power supply circuit and the first inverter module and a second capacitor connected in parallel between the second power supply circuit and the second inverter module.
4. The motor drive control circuit of claim 1 further comprising a rectifier bridge having an input connected to an ac input and an anode output connected to the input of the first power supply circuit and the input of the second power supply circuit.
5. The motor drive control circuit according to claim 1, wherein the first switch group includes a first switch and a second switch, the first three-phase lead line group includes a first pin, a second pin, and a third pin, the first switch is connected to the first pin and the second pin, respectively, and the second switch is connected to the second pin and the third pin, respectively.
6. The motor drive control circuit according to claim 1, wherein the first switch group includes a fifth switch, a sixth switch, and a seventh switch, the first three-phase lead-out line group includes a first pin, a second pin, and a third pin, one end of the fifth switch is connected to the first pin, one end of the sixth switch is connected to the second pin, one end of the seventh switch is connected to the third pin, and the other end of the fifth switch, the other end of the sixth switch, and the other end of the seventh switch are shorted.
7. The motor drive control circuit of claim 1, wherein the second switch group comprises a third switch and a fourth switch, the second three-phase lead-out wire group comprises a fourth pin, a fifth pin and a sixth pin, the third switch is respectively connected with the fourth pin and the fifth pin, and the fourth switch is respectively connected with the fifth pin and the sixth pin.
8. The motor drive control circuit according to claim 1, wherein the second switch group includes an eighth switch, a ninth switch, and a tenth switch, the second three-phase lead line group includes a fourth pin, a fifth pin, and a sixth pin, one end of the eighth switch is connected to the fourth pin, one end of the ninth switch is connected to the fifth pin, one end of the tenth switch is connected to the sixth pin, and the other end of the eighth switch, the other end of the ninth switch, and the other end of the tenth switch are short-circuited.
9. The driving method is applied to a motor driving control circuit, the motor driving control circuit is used for driving a motor with three-phase windings, one end of each phase of the windings forms a first three-phase lead-out wire group, and the other end of each phase of the windings forms a second three-phase lead-out wire group, and the motor driving control circuit is characterized by comprising the following steps:
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase lead-out wire group, the second switch group is connected with the second three-phase lead-out wire group, the first switch group is closed, the second switch group is opened, the three-phase winding is switched to be in first star connection, the first switch group is opened, the second switch group is closed, the three-phase winding is switched to be in second star connection, the first switch group is opened, the second switch group is opened, and the three-phase winding is switched to be in on-winding connection;
the first inversion module is connected with the first three-phase lead-out wire group;
the second inversion module is connected with the second three-phase lead-out wire group;
the first power supply circuit is connected with the first inversion module to provide a first power supply voltage;
the second power supply circuit is connected with the second inverter module to provide a second power supply voltage;
the driving method includes:
controlling opening and closing of the switching assembly to switch the three-phase winding between the first star connection and the second star connection or between the second star connection and the open winding connection;
controlling the first inversion module and the second inversion module to start or stop working so that the first inversion module or the second inversion module provides driving voltage for the three-phase winding in a corresponding connection state;
the first power supply circuit is a boost circuit, the second power supply circuit is a buck circuit, and the first power supply circuit and the second power supply circuit are connected with the same input power supply;
the controlling of the opening and closing of the switching assembly to switch the three-phase winding between the first star connection and the second star connection or between the second star connection and the open-winding connection includes:
when the operating frequency of the motor is lower than a first frequency threshold value, controlling the opening and closing of the switch assembly to enable the three-phase winding to be switched from the second star connection to the first star connection;
when the operating frequency of the motor is higher than the first frequency threshold and lower than a second frequency threshold, controlling the opening and closing of the switch assembly to switch the three-phase winding from the first star connection to the second star connection;
when the operating frequency of the motor is higher than the second frequency threshold, controlling the opening and closing of the switch assembly to switch the three-phase winding from a second star connection to an open winding connection.
10. The driving method according to claim 9, wherein the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module supplies a driving voltage to the three-phase winding in a corresponding connection state comprises:
and controlling the first inversion module to start working, and controlling the second inversion module to stop working so that the first inversion module provides a first driving voltage for the three-phase winding in the second star connection state.
11. The driving method according to claim 10, wherein the controlling the first inverter module to start operating and the second inverter module to stop operating so that the first inverter module supplies the first driving voltage to the three-phase winding in the second wye connection state comprises:
controlling the first inversion module to output a neutral point voltage of the three-phase winding in the first star connection state;
controlling the first switch set to be switched off, and maintaining the voltage value output by the first inversion module within a first time threshold, wherein the first time threshold is greater than the switching-off duration of the first switch set;
controlling the first inversion module to output the first driving voltage, and controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be closed, and maintaining the voltage value output by the second inversion module within a second time threshold, wherein the second time threshold is greater than the closing duration of the second switch group;
and controlling the second inversion module to stop working.
12. The driving method according to claim 9, wherein the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module supplies a driving voltage to the three-phase winding in a corresponding connection state comprises:
and controlling the second inversion module to start working, and controlling the first inversion module to stop working so as to enable the second inversion module to provide a second driving voltage for the three-phase winding in the first star connection state.
13. The driving method according to claim 12, wherein the controlling the second inverter module to start operating and the first inverter module to stop operating so that the second inverter module supplies the second driving voltage to the three-phase winding in the first star connection state comprises:
controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be switched off, and maintaining the voltage value output by the second inversion module within a third time threshold, wherein the third time threshold is greater than the switching-off duration of the second switch group;
controlling the second inversion module to output the second driving voltage, and controlling the first inversion module to output a neutral point voltage of the three-phase winding in the first star connection state;
controlling the first switch group to be closed, and maintaining the voltage value output by the first inversion module within a fourth time threshold, wherein the fourth time threshold is greater than the closing duration of the first switch group;
and controlling the first inversion module to stop working.
14. The driving method according to claim 9, wherein the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module supplies a driving voltage to the three-phase winding in a corresponding connection state comprises:
and controlling the second inversion module to start working so that the first inversion module provides a third driving voltage for the three-phase winding in the open winding connection state and the second inversion module provides a fourth driving voltage for the three-phase winding in the open winding connection state.
15. The driving method according to claim 14, wherein controlling the second inverter module to start operating so that the first inverter module supplies a third driving voltage to the three-phase windings in the open-winding connected state and the second inverter module supplies a fourth driving voltage to the three-phase windings in the open-winding connected state comprises:
controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be switched off, and maintaining the voltage value output by the second inversion module within a fifth time threshold, wherein the fifth time threshold is greater than the switching-off duration of the second switch group;
and controlling the first inversion module to output the third driving voltage, and controlling the second inversion module to output the fourth driving voltage.
16. The driving method according to claim 9, wherein the controlling the first inverter module and the second inverter module to start or stop operating so that the first inverter module or the second inverter module supplies a driving voltage to the three-phase winding in a corresponding connection state comprises:
and controlling the second inversion module to stop working so that the first inversion module provides a first driving voltage for the three-phase winding in the second star connection state.
17. The driving method according to claim 16, wherein controlling the second inverter module to be out of operation so that the first inverter module supplies the first driving voltage to the three-phase winding in the second wye connection state includes:
controlling the first inversion module to output the first driving voltage, and controlling the second inversion module to output a neutral point voltage of the three-phase winding in the second star connection state;
controlling the second switch group to be closed, and maintaining the voltage value output by the second inversion module within a sixth time threshold, wherein the sixth time threshold is greater than the disconnection duration of the second switch group;
and controlling the second inversion module to stop working.
18. A wiring board characterized by comprising the motor drive control circuit according to any one of claims 1 to 8.
19. An air conditioner, characterized by 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 the method of driving as claimed in any one of claims 9 to 17.
20. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the driving method according to any one of claims 9 to 17.
CN202010301087.1A 2020-04-16 2020-04-16 Motor drive control circuit, motor drive method, circuit board and air conditioner Active CN111355420B (en)

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WO2021209036A1 (en) * 2020-04-16 2021-10-21 广东美的制冷设备有限公司 Motor drive control circuit, driving method, circuit board, and air conditioner
KR20230169643A (en) * 2022-06-09 2023-12-18 현대자동차주식회사 Motor driving apparatus

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JP2010193702A (en) * 2009-01-21 2010-09-02 Kazuo Kawabe Apparatus and method for controlling induction motor
CN102208877A (en) * 2010-03-30 2011-10-05 上海海事大学 Mixing voltage source type DC/ AC inverter
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