CN111355421B - Drive control circuit, drive control method, circuit board and air conditioner - Google Patents

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

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Publication number
CN111355421B
CN111355421B CN202010301094.1A CN202010301094A CN111355421B CN 111355421 B CN111355421 B CN 111355421B CN 202010301094 A CN202010301094 A CN 202010301094A CN 111355421 B CN111355421 B CN 111355421B
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China
Prior art keywords
switch
phase winding
phase
driving circuit
switch group
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CN202010301094.1A
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Chinese (zh)
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CN111355421A (en
Inventor
黄招彬
赵鸣
徐锦清
龙谭
张杰楠
曾贤杰
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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 CN202010301094.1A priority Critical patent/CN111355421B/en
Publication of CN111355421A publication Critical patent/CN111355421A/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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/184—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa

Abstract

The invention discloses a drive control circuit, a drive control method, a circuit board and an air conditioner, wherein the drive control circuit comprises a first drive circuit, a switch component, a second drive circuit, a first power supply circuit and a second power supply circuit; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit and second drive circuit respectively, first drive circuit and second drive circuit provide corresponding driving voltage to three-phase winding when three-phase winding is in different connection state respectively again for three-phase winding all can obtain suitable driving voltage when being in different connection state, in order to realize that the motor can the high-efficient operation at different connection mode homoenergetic.

Description

Drive control circuit, drive control method, circuit board and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a drive control circuit, a drive control method, a circuit board, an air conditioner and a storage medium.
Background
The variable frequency compressor of the existing variable frequency air conditioner mostly adopts a permanent magnet motor as a driving motor, and is influenced by the operation requirement of the variable frequency air conditioner, a three-phase winding of the permanent magnet motor generally needs to be switched between triangular connection and open winding connection, and when the variable frequency compressor is in different connection modes, the operation frequency of the motor is different, so that the driving voltage required by the three-phase winding is also different. However, the dc bus voltage cannot simultaneously satisfy the driving voltage requirements of the motor when the motor operates in different connection modes, and the motor cannot efficiently operate in different connection modes.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the embodiment of the invention provides a drive control circuit, a drive control method, a circuit board, an air conditioner and a storage medium, which can realize that a motor can efficiently run in different connection modes.
In a first aspect, an embodiment of the present invention provides a drive control circuit, configured to drive an open-winding motor having three-phase windings, where one end of each phase of the winding forms a first three-phase outgoing line group, and the other end of each phase of the winding forms a second three-phase outgoing line group, where the drive control circuit includes:
the switch assembly comprises a first switch group, the first switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the three-phase winding is switched to be in triangular connection, the first switch group is disconnected, and the three-phase winding is switched to be in open winding connection;
the first driving circuit is connected with the second three-phase outgoing line group and used for providing a first driving voltage for the three-phase winding in a delta connection state and providing a second driving voltage for the three-phase winding in an open winding state;
the second driving circuit is connected with the first three-phase outgoing line group and used for providing a third driving voltage for the three-phase winding in the open winding connection state;
the first power supply circuit is connected with the first driving circuit and used for providing a first power supply voltage for the first driving circuit;
and the second power supply circuit is connected with the second driving circuit and used for providing a second power supply voltage for the second driving circuit.
The drive control circuit provided by the embodiment of the invention at least has the following beneficial effects: by arranging the switch assembly, the connection mode of the three-phase winding can be switched according to different working frequencies of the motor, and the running efficiency of the motor is improved; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit and second drive circuit respectively, first drive circuit and second drive circuit provide corresponding driving voltage to three-phase winding when three-phase winding is in different connection state respectively again for three-phase winding all can obtain suitable driving voltage when being in different connection state, in order to realize that the motor can the high-efficient operation at different connection mode homoenergetic.
In some embodiments of the present invention, the first power supply circuit includes a voltage step-down circuit.
In the above technical solution, the first power supply circuit includes a voltage reduction circuit, and can provide a lower power supply voltage for the first driving circuit.
In some embodiments of the invention, the second power supply circuit comprises a boost circuit.
In the above technical solution, the second power supply circuit includes a boost circuit, and may provide a higher power supply voltage for the second driving circuit.
In some embodiments of the invention, the first and second power supply circuits are arranged in common to ground and common to the bus.
In the above technical scheme, the first power supply circuit and the second power supply circuit are arranged in common ground and in common bus, which is beneficial to improving the stability of work.
In some embodiments of the present invention, the second drive circuit supplies a fourth drive voltage to the three-phase winding during switching of the three-phase winding between the delta connection and the open-winding connection, the fourth drive voltage being for keeping the motor running during switching of the three-phase winding connection state.
In the above technical solution, the switch assembly is generally mechanical, and the closing or opening action of the switch assembly needs a certain time period to be completed, and if the existing scheme is used to switch the connection mode, the permanent magnet motor needs to be powered off and shut down momentarily, thereby affecting the normal operation of the compressor. Therefore, when the connection mode of the three-phase winding is switched, the second driving circuit can provide the fourth driving voltage for the three-phase winding in the switching process of the connection state of the three-phase winding so as to simulate the voltage environment of the first switch group in the switching process, therefore, when the connection mode is switched, even if the first switch group changes the switching state, the motor still runs normally, the non-stop switching of the connection mode of the three-phase winding of the motor can be realized, and the normal operation of the compressor is not influenced.
In some embodiments of the present invention, the fourth driving voltage is a three-phase voltage in which the three-phase winding is in the delta connection state.
In the above technical solution, the fourth driving voltage is a three-phase voltage of the three-phase winding in the delta connection state, and can simulate a voltage environment when the three-phase winding is in delta connection.
In some embodiments of the present invention, the first switch group includes a first switch, a second switch, and a third switch, the three-phase winding includes a first phase winding, a second phase winding, and a third phase winding, the first phase winding includes a first pin and a sixth pin, the second phase winding includes a second pin and a fifth pin, the third phase winding includes a third pin and a fourth pin, the first three-phase outgoing line group includes the first pin, the second pin, and the third pin, the second three-phase outgoing line group includes the fourth pin, the fifth pin, and the sixth pin, the first switch connects the second pin and the sixth pin, the second switch connects the third pin and the fifth pin, and the third switch connects the first pin and the fourth pin.
In the above technical scheme, the first switch group includes a first switch, a second switch and a third switch, when the first switch, the second switch and the third switch are closed at the same time, the second pin and the sixth pin are connected to each other, the third pin and the fifth pin are connected to each other, and the first pin and the fourth pin are connected to each other, so that the three-phase winding is in triangular connection.
In some embodiments of the present invention, the switch assembly further includes a second switch group and a third switch group, the second switch group is connected to the first three-phase outgoing line group, the third switch group is connected to the second three-phase outgoing line group, the second switch group is closed, the first switch group and the third switch group are both open, the first driving circuit provides a first driving voltage to the three-phase windings, and the three-phase windings are switched to a first star connection; the first switch set is closed, the second switch set and the third switch set are both opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in a first triangular connection; the third switch set is closed, the first switch set and the second switch set are both open, the second drive circuit provides a third drive voltage to the three-phase winding, and the three-phase winding is switched to a second star connection; the first switch set is closed, the second switch set and the third switch set are both opened, the second driving circuit provides a third driving voltage for the three-phase winding, and the three-phase winding is switched to a second triangular connection; the first switch group, the second switch group and the third switch group are all disconnected, the first driving circuit provides second driving voltage for the three-phase winding, the second driving circuit provides third driving voltage for the three-phase winding, and the three-phase winding is switched to be connected with the open winding.
In the above technical scheme, by setting the second switch group and the third switch group, the first switch group, the second switch group and the third switch group are switched to provide corresponding driving voltages in different connection states of the three-phase windings by matching the first driving circuit and the second driving circuit, so that the three-phase windings can realize first star connection, second star connection, first triangular connection, second triangular connection and open winding connection, and therefore, the connection states of the three-phase windings are switched according to the working frequency of the motor, the motor is more detailed, and the motor is favorable for further improving the operation efficiency of the motor.
In some embodiments of the present invention, the second switch group includes a fourth switch and a fifth switch, the first three-phase outgoing line group includes a first pin, a second pin and a third pin, the fourth switch is respectively connected to the first pin and the second pin, and the fifth switch is respectively connected to the second pin and the third pin;
and/or the presence of a gas in the gas,
the third switch group comprises a seventh switch and an eighth switch, the second three-phase outgoing line group comprises a fourth pin, a fifth pin and a sixth pin, the seventh switch is respectively connected with the fourth pin and the fifth pin, and the eighth switch is respectively connected with the fifth pin and the sixth pin.
In the above technical solution, the second switch group includes a fourth switch and a fifth switch, and when the fourth switch and the fifth switch are simultaneously closed, the first pin, the second pin and the third pin are connected to each other, so that the three-phase winding is in a first star connection state; similarly, the third switch group comprises a seventh switch and an eighth switch, and when the seventh switch and the eighth switch are simultaneously closed, the fourth pin, the fifth pin and the sixth pin are connected with each other, so that the three-phase winding is in a second star connection state.
In some embodiments of the present invention, the second switch group includes a fourth switch, a fifth switch and a sixth switch, the first three-phase outgoing line group includes a first pin, a second pin and a third pin, one ends of the fourth switch, the fifth switch and the sixth switch are connected to each other, and the other ends of the fourth switch, the fifth switch and the sixth switch are respectively connected to the first pin, the second pin and the third pin;
and/or the presence of a gas in the gas,
the third switch group comprises a seventh switch, an eighth switch and a ninth switch, the second three-phase outgoing line group comprises a fourth pin, a fifth pin and a sixth pin, one ends of the seventh switch, the eighth switch and the ninth switch are connected with each other, and the other ends of the seventh switch, the eighth switch and the ninth switch are respectively and correspondingly connected with the fourth pin, the fifth pin and the sixth pin.
In the above technical solution, the second switch group includes a fourth switch, a fifth switch and a sixth switch, and when the fourth switch, the fifth switch and the sixth switch are simultaneously closed, the first pin, the second pin and the third pin are connected to each other, so that the three-phase winding is in a first star connection state; similarly, the third switch group comprises a seventh switch, an eighth switch and a ninth switch, and when the seventh switch, the eighth switch and the ninth switch are simultaneously closed, the fourth pin, the fifth pin and the sixth pin are connected with each other, so that the three-phase winding is in a second star connection state.
In some embodiments of the present invention, the step-down circuit is a step-down chopper circuit, the step-down chopper circuit includes a first switching tube, a first freewheeling element, a first inductor, a first capacitor, and a first diode, a drain of the first switching tube, a source of the first switching tube, and the first inductor are sequentially connected in series and then connected to the first driving circuit, a source of the first switching tube, the first freewheeling element, and a reference ground are sequentially connected in series, a source of the first switching tube, the first inductor, the first capacitor, and the reference ground are sequentially connected in series, and the first diode is connected in inverse parallel to the first switching tube.
In the technical scheme, the second switching tube is controlled to be disconnected, when the first switching tube is switched on, a power supply for supplying power charges the first inductor and the first capacitor at the same time, and electric energy is provided for the first driving circuit; when the first switch tube is switched off, the first inductor discharges through the second diode, the current of the first inductor is linearly reduced, the electric energy output to the first driving circuit is maintained by the first capacitor, and therefore the voltage output to the first driving circuit is lower than the voltage provided by the power supply for supplying power, and the voltage reduction effect is achieved.
In some embodiments of the present invention, the boosting circuit is a boosting chopper circuit or a totem-pole circuit.
In some embodiments of the present invention, the boost chopper circuit includes a second freewheeling element, a fourth switching tube, a second inductor, a second capacitor, and a fourth diode, the second inductor and the second freewheeling element are sequentially connected in series and then connected to the second driving circuit, the second inductor, a drain of the fourth switching tube, a source of the fourth switching tube, and a ground are sequentially connected in series, the second freewheeling element, the second capacitor, and the ground are sequentially connected in series, and the fourth diode is connected in anti-parallel to the fourth switching tube.
In the technical scheme, the third switching tube is controlled to be switched off, and when the fourth switching tube is switched on, the power supply for supplying power charges the second inductor; when the fourth switching tube is switched off, the second power supply assembly charges the second capacitor; therefore, the electric energy finally output to the second driving circuit is provided by the second capacitor and the second inductor at the same time, so that the voltage output to the second driving circuit is higher than the voltage provided by the power supply for supplying power, and a boosting effect is realized.
In some embodiments of the invention, the first power supply circuit further comprises a first power pack, the first power pack being connected to the voltage reduction circuit.
In the above technical solution, by providing the first power supply set, the input voltage can be provided for the voltage reduction circuit.
In some embodiments of the invention, the second power supply circuit further comprises a second power pack, the second power pack being connected to the boost circuit.
In the above technical solution, by providing the second power supply set, the input voltage can be provided to the boost circuit.
In some embodiments of the present invention, each of the first driving circuit and the second driving circuit includes a first bridge arm, a second bridge arm, and a third bridge arm that are connected in parallel, each of the first bridge arm, the second bridge arm, and the third bridge arm includes two fifth switching tubes connected in series, and a fifth diode is connected in anti-parallel to each of the fifth switching tubes.
In the above technical scheme, the first bridge arm, the second bridge arm and the third bridge arm form a three-phase bridge structure, and the first driving circuit and the second driving circuit can respectively output the first driving voltage and the second driving voltage by controlling the on-off states of the six fifth switching tubes.
In a second aspect, an embodiment of the present invention further provides a driving control method applied to a driving control circuit, where the driving control circuit is configured to drive an open-winding motor having three-phase windings, one end of each phase of the windings forms a first three-phase outgoing line group, and the other end of each phase of the windings forms a second three-phase outgoing line group, and the driving control circuit includes:
the switch assembly comprises a first switch group, the first switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the three-phase winding is switched to be in triangular connection, the first switch group is disconnected, and the three-phase winding is switched to be in open winding connection;
the first driving circuit is connected with the second three-phase outgoing line group;
the second driving circuit is connected with the first three-phase outgoing line group;
the first power supply circuit is connected with the first driving circuit;
the second power supply circuit is connected with the second driving circuit;
the drive control method includes:
controlling the switching of the switching assembly to switch the connection state of the three-phase winding;
and controlling the first driving circuit and the second driving circuit to start or stop working so as to enable the first driving circuit or the second driving circuit to provide driving voltage for the three-phase windings in the corresponding connection state.
The drive control method provided by the embodiment of the invention at least has the following beneficial effects: the switching of the switching assembly is controlled to enable the three-phase windings to switch the connection state, so that the connection mode of the three-phase windings can be switched according to different working frequencies of the motor, and the running efficiency of the motor is improved; the first driving circuit and the second driving circuit are controlled to start or stop working, so that the first driving circuit or the second driving circuit provides driving voltage for the three-phase winding in the corresponding connection state, the three-phase winding can obtain proper driving voltage in different connection states, and the motor can efficiently run in different connection modes.
In some embodiments of the present invention, the switching of the three-phase winding to the delta connection, and the controlling of the first and second driving circuits to start or stop operation so that the first or second driving circuit supplies a driving voltage to the three-phase winding in a corresponding connection state, includes:
and controlling the first driving circuit to start working, and controlling the second driving circuit to stop working so as to enable the first driving circuit to provide a first driving voltage for the three-phase winding in the delta connection state.
In the technical scheme, when the three-phase winding is switched from open winding connection to delta connection, the first driving circuit provides the first driving voltage for the three-phase winding, and the second driving circuit stops working, so that the suitable driving voltage can be obtained when the three-phase winding is in delta connection.
In some embodiments of the present invention, the switching of the three-phase winding to the open-winding connection, and the controlling of the first and second driving circuits to start or stop operation so that the first or second driving circuit supplies a driving voltage to the three-phase winding in a corresponding connection state, includes:
and controlling the first driving circuit to start working, and controlling the second driving circuit to start working, so that the first driving circuit provides a second driving voltage for the three-phase winding in the open winding connection state, and the second driving circuit provides a third driving voltage for the three-phase winding in the open winding connection state.
In the above technical solution, when the three-phase winding is switched from the delta connection to the open winding connection, the first driving circuit provides the second driving voltage to the three-phase winding, and the second driving circuit provides the third driving voltage to the three-phase winding, so that the suitable driving voltage can be obtained when the three-phase winding is in the open winding connection.
In some embodiments of the present invention, the switch assembly further includes a second switch group and a third switch group, the second switch group is connected to the first three-phase outgoing line group, the third switch group is connected to the second three-phase outgoing line group, and the driving control method further includes at least one of:
controlling the second switch group to be closed, the first switch group and the third switch group to be opened so as to switch the three-phase winding to be in a first star connection; controlling the first driving circuit to start working, and controlling the second driving circuit to stop working, so that the first driving circuit provides a first driving voltage for the three-phase winding in the first star connection state;
controlling the first switch group to be closed, the second switch group and the third switch group to be opened so as to switch the three-phase winding to be connected in a first triangular mode; controlling the first driving circuit to start working, and controlling the second driving circuit to stop working so that the first driving circuit provides a first driving voltage for the three-phase winding in the first delta connection state;
controlling the third switch group to be closed, and the first switch group and the second switch group to be opened so as to switch the three-phase winding to be in a second star connection; controlling the first driving circuit to stop working, and controlling the second driving circuit to start working, so that the second driving circuit provides a third driving voltage for the three-phase winding in the second star connection state;
controlling the first switch group to be closed, the second switch group and the third switch group to be opened so as to switch the three-phase winding to be in second triangular connection; controlling the first driving circuit to stop working, and controlling the second driving circuit to start working, so that the second driving circuit provides a third driving voltage for the three-phase winding in the second delta connection state;
controlling the first switch group, the second switch group and the third switch group to be disconnected so as to switch the three-phase winding to be connected with an open winding; and controlling the first driving circuit to start working, and controlling the second driving circuit to start working, so that the first driving circuit provides a second driving voltage for the three-phase winding in the open winding connection state, and the second driving circuit provides a third driving voltage for the three-phase winding in the open winding connection state.
In the above technical scheme, by setting the second switch group and the third switch group, the first switch group, the second switch group and the third switch group are switched to provide corresponding driving voltages in different connection states of the three-phase windings by matching the first driving circuit and the second driving circuit, so that the three-phase windings can realize first star connection, second star connection, first triangular connection, second triangular connection and open winding connection, and therefore, the connection states of the three-phase windings are switched according to the working frequency of the motor, the motor is more detailed, and the motor is favorable for further improving the operation efficiency of the motor.
In some embodiments of the present invention, the driving control method further comprises:
and controlling the second driving circuit to provide a fourth driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding.
In the above technical solution, the second driving circuit is controlled to provide the fourth driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding to simulate the voltage environment of the first switch group in the switching process, so that when the connection mode is switched, even if the first switch group changes the on-off state, the motor still operates normally, the non-stop switching of the connection mode of the three-phase winding of the motor can be realized, and the normal operation of the compressor is not affected.
In some embodiments of the present invention, the switching of the three-phase winding to the open-winding connection, the controlling of the second drive circuit to supply the fourth drive voltage to the three-phase winding during the switching of the three-phase winding connection state, includes:
the three-phase winding keeps the triangular connection and controls the second driving circuit to output three-phase voltage of the three-phase winding in the triangular connection state;
the first switch group is controlled to be switched off, and the second driving circuit outputs three-phase voltage of the three-phase winding in the triangular connection state for a first time threshold value;
and controlling the first driving circuit to output a second driving voltage, and controlling the second driving circuit to output a third driving voltage.
In the technical scheme, the second driving circuit is controlled to simulate the three-phase voltage of the three-phase winding in the triangular connection state, and the three-phase winding can still operate in the triangular connection state even if the second switch group is disconnected, so that non-stop switching is realized.
In some embodiments of the present invention, the switching of the three-phase winding to the delta connection, the controlling of the second drive circuit to supply a fourth drive voltage to the three-phase winding during the switching of the connection state of the three-phase winding, includes:
the three-phase winding keeps the open winding connection and controls the second driving circuit to output three-phase voltage of the three-phase winding in the triangular connection state;
controlling the first switch group to be closed, and outputting three-phase voltage of the three-phase winding in the triangular connection state by the second driving circuit for a first time threshold value;
and controlling the first driving circuit to output a first driving voltage and controlling the second driving circuit to stop working.
In the technical scheme, the second driving circuit is controlled to simulate the three-phase voltage of the three-phase winding in the triangular connection state, namely, the three-phase winding can be operated in the triangular connection state in the closing process of the second switch group, so that the switching without stopping is realized.
In some embodiments of the present invention, the controlling the opening and closing of the switching assembly to cause the three-phase winding to switch the connection state includes at least one of:
controlling the switching of the switching assembly to switch the three-phase winding to the delta connection according to the operating frequency of the motor being lower than a first frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the operating frequency of the motor being higher than the second frequency threshold;
wherein the first frequency threshold is less than or equal to the second frequency threshold.
In the technical scheme, the working frequency of the motor is judged, the three-phase winding is switched to the corresponding connection state according to the working frequency of the motor, the motor can operate in a connection mode matched with the working frequency, and the operation efficiency of the motor is improved. When the first frequency threshold is smaller than the second frequency threshold, the second frequency threshold and the third frequency threshold can form a hysteresis interval when the working frequency of the motor is judged, so that the phenomenon that the connection state of the motor is frequently switched can be avoided, and the running stability of the motor is ensured.
In some embodiments of the present invention, the switch assembly further includes a second switch group and a third switch group, the second switch group is connected with the first three-phase outgoing line group, and the third switch group is connected with the second three-phase outgoing line group; the second switch group is closed, the first switch group and the third switch group are all opened, and the three-phase winding is switched to be in first star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in first triangular connection; the third switch group is closed, the first switch group and the second switch group are all opened, and the three-phase winding is switched to a second star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the second driving circuit provides third driving voltage for the three-phase winding, and the three-phase winding is switched to be in second triangular connection; the first switch group, the second switch group and the third switch group are all disconnected, the three-phase winding is switched to be connected with an open winding, and the control of the opening and the closing of the switch assembly to enable the three-phase winding to be switched to be connected comprises at least one of the following steps:
controlling the switching of the switching assembly to switch the three-phase winding to the first star connection according to the operating frequency of the motor being lower than a third frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the first triangular connection according to the fact that the working frequency of the motor is higher than the third frequency threshold and lower than a fourth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second star connection according to the operating frequency of the motor being higher than the fourth frequency threshold and lower than a fifth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second delta connection according to the fact that the working frequency of the motor is higher than the fifth frequency threshold and lower than a sixth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the operating frequency of the motor being higher than the sixth frequency threshold;
wherein the frequency third threshold, the fourth frequency threshold, the fifth frequency threshold, and the sixth frequency threshold increase sequentially.
In the technical scheme, the working frequency of the motor is judged, the three-phase winding is switched to the corresponding connection state according to the working frequency of the motor, the motor can operate in a connection mode matched with the working frequency, and the operation efficiency of the motor is improved.
In some embodiments of the present invention, the switch assembly further includes a second switch group and a third switch group, the second switch group is connected with the first three-phase outgoing line group, and the third switch group is connected with the second three-phase outgoing line group; the second switch group is closed, the first switch group and the third switch group are all opened, and the three-phase winding is switched to be in first star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in first triangular connection; the third switch group is closed, the first switch group and the second switch group are all opened, and the three-phase winding is switched to a second star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the second driving circuit provides third driving voltage for the three-phase winding, and the three-phase winding is switched to be in second triangular connection; the first switch group, the second switch group and the third switch group are all disconnected, the three-phase winding is switched to be connected with an open winding, and the control of the opening and the closing of the switch assembly to enable the three-phase winding to be switched to be connected comprises at least one of the following steps:
controlling the switching of the switching assembly to switch the three-phase winding to the first star connection according to the operating frequency of the motor being below a seventh frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the first delta connection according to the fact that the working frequency of the motor is higher than an eighth frequency threshold and lower than a ninth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second star connection according to the operating frequency of the motor being higher than a tenth frequency threshold and lower than an eleventh frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second delta connection according to the operating frequency of the motor being higher than a twelfth frequency threshold and lower than a thirteenth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the fact that the working frequency of the motor is higher than a fourteenth frequency threshold;
wherein the seventh frequency threshold, the eighth frequency threshold, the ninth frequency threshold, the tenth frequency threshold, the eleventh frequency threshold, the twelfth frequency threshold, the thirteenth frequency threshold and the fourteenth frequency threshold increase sequentially.
In the above technical scheme, when the operating frequency of the motor is determined, the seventh frequency threshold and the eighth frequency threshold can form a hysteresis interval, the ninth frequency threshold and the tenth frequency threshold can form a hysteresis interval, the eleventh frequency threshold and the twelfth frequency threshold can form a hysteresis interval, and the thirteenth frequency threshold and the fourteenth frequency threshold can form a hysteresis interval, so that a phenomenon that the connection state of the motor is frequently switched can be avoided, and the stability of the operation of the motor is ensured.
In a third aspect, an embodiment of the present invention further provides a circuit board, including the driving control circuit according to the first aspect.
Therefore, the circuit board can realize switching of the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch assembly, and the operation efficiency of the motor is improved; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit and second drive circuit respectively, first drive circuit and second drive circuit provide corresponding driving voltage to three-phase winding when three-phase winding is in different connection state respectively again for three-phase winding all can obtain suitable driving voltage when being in different connection state, in order to realize that the motor can the high-efficient operation at different connection mode homoenergetic.
In a fourth aspect, an embodiment of the present invention further provides an air conditioner, including the circuit board of the third aspect.
Therefore, the air conditioner can realize switching of the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch assembly, and the operation efficiency of the motor is improved; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit and second drive circuit respectively, first drive circuit and second drive circuit provide corresponding driving voltage to three-phase winding when three-phase winding is in different connection state respectively again for three-phase winding all can obtain suitable driving voltage when being in different connection state, in order to realize that the motor can the high-efficient operation at different connection mode homoenergetic.
In a fifth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to cause a computer to execute the drive control method according to the second aspect.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic circuit diagram of a driving control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a driving control circuit according to another embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a voltage step-down circuit according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a boost circuit according to an embodiment of the present invention;
fig. 5 is a waveform diagram of signals for controlling the three-phase winding to switch from the delta connection to the open winding connection by the driving control circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a driving control circuit according to another embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a driving control circuit according to another embodiment of the present invention;
fig. 8 is a waveform diagram of signals for controlling the three-phase winding to switch from the first wye connection to the first delta connection by the driving control circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first driving circuit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a second driving circuit according to an embodiment of the present invention;
fig. 11 is a flowchart of a driving control method according to an embodiment of the present invention;
fig. 12 is a flowchart illustrating supplementary steps of a driving control method according to another embodiment of the present invention;
fig. 13 is a flowchart for controlling the second driving circuit to supply the fourth driving voltage to the three-phase windings during the switching of the connection state of the three-phase windings according to an embodiment of the present invention;
fig. 14 is a flowchart for controlling the second driving circuit to supply the fourth driving voltage to the three-phase windings during the switching of the connection state of the three-phase windings according to another embodiment of the present invention;
fig. 15 is a schematic diagram illustrating a connection manner of switching three-phase windings according to an operating frequency of a motor according to an embodiment of the present invention;
fig. 16 is a schematic diagram illustrating a connection manner of switching three-phase windings according to an operating frequency of a motor according to another embodiment of the present invention;
fig. 17 is a schematic diagram illustrating a connection manner of switching three-phase windings according to an operating frequency of a motor according to another embodiment of the present invention;
fig. 18 is a schematic diagram illustrating a connection manner of switching three-phase windings according to an operating frequency of a motor according to another embodiment of the present invention;
FIG. 19 is a schematic diagram of a circuit board according to an embodiment of the present invention;
FIG. 20 is a schematic diagram of an air conditioner according to an embodiment of the present invention;
fig. 21 is a schematic view of an air conditioner according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, at least two means are one or more, a plurality means are at least two, and greater than, less than, more than, etc. are understood as excluding the present numbers, and above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The variable frequency compressor of the existing variable frequency air conditioner mostly adopts a permanent magnet motor as a driving motor, and is influenced by the operation requirement of the variable frequency air conditioner, a three-phase winding of the permanent magnet motor generally needs to be switched between triangular connection and open winding connection, and when the variable frequency compressor is in different connection modes, the operation frequency of the motor is different, so that the driving voltage required by the three-phase winding is also different. However, the dc bus voltage cannot simultaneously satisfy the driving voltage requirements of the motor when the motor operates in different connection modes, and the motor cannot efficiently operate in different connection modes.
Based on this, the embodiment of the invention provides a drive control circuit, a drive control method, a circuit board, an air conditioner and a storage medium, which can realize that a motor can efficiently operate in different connection modes.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, an embodiment of the present invention provides a driving control circuit for driving an open-winding motor having three-phase windings 100, where one end of each phase winding forms a first three-phase outgoing line group 101, and the other end of each phase winding forms a second three-phase outgoing line group 102, the driving control circuit includes a first driving circuit 110, a switch assembly 120, a second driving circuit 130, a first power supply circuit, and a second power supply circuit, the switch assembly 120 includes a first switch group 121, the first switch group 121 is connected to the first three-phase outgoing line group 101 and the second three-phase outgoing line group 102, the first switch group 121 is closed, the three-phase windings 100 are switched to a delta connection, the first switch group 121 is open, and the three-phase windings 100 are switched to an open-winding connection; the first drive circuit 110 is connected to the second three-phase outgoing line group 102, and is configured to supply a first drive voltage to the three-phase winding 100 in the delta connection state and supply a second drive voltage to the three-phase winding 100 in the open winding state; the second drive circuit 130 is connected to the first three-phase outgoing line group 101, and is configured to supply a third drive voltage to the three-phase winding 100 in the open winding connection state; the first power supply circuit is connected to the first driving circuit 110, and is configured to provide a first power supply voltage to the first driving circuit 110; the second power supply circuit is connected to the second driving circuit 130, and is configured to provide a second power supply voltage to the second driving circuit 130.
In an embodiment, the first switch group 121 includes a first switch K1, a second switch K2, and a third switch K3, the three-phase winding 100 includes a three-phase winding, pins of the first phase winding, the second phase winding, and the third phase winding are led out of the motor, two ends of the first phase winding are led out of a first pin M1 and a sixth pin M6, two ends of the second phase winding are led out of a second pin M2 and a fifth pin M5, two ends of the third phase winding are led out of a third pin M3 and a fourth pin M4, respectively, based on which, the first three-phase outgoing line group 101 includes a first pin M1, a second pin M2 and a third pin M3, the second three-phase outgoing line group 102 includes a fourth pin M4, a fifth pin M5 and a sixth pin M6, the first switch K1 is connected to the second pin M2 and the sixth pin M6, the second switch K2 is connected to the third pin M3 and the fifth pin M5, and the third switch K3 is connected to the first pin M1 and the fourth pin M4.
When the first switch K1, the second switch K2 and the third switch K3 are simultaneously closed, the second pin M2 and the sixth pin M6 are connected to each other, the third pin M3 and the fifth pin M5 are connected to each other, and the first pin M1 and the fourth pin M4 are connected to each other, so that the three-phase winding 100 is connected in a delta shape. When the first switch K1, the second switch K2 and the third switch K3 are simultaneously turned off, the first pin M1, the second pin M2, the third pin M3, the fourth pin M4, the fifth pin M5 and the sixth pin M6 are separately powered, so that the three-phase winding 100 is in an open winding connection.
The three-phase winding 100 is in a delta connection state, the motor generally operates at a medium-low frequency, and the second driving voltage provided by the first driving circuit 110 to the three-phase winding 100 is higher than the first driving voltage; when the three-phase winding 100 is in the open winding connection state, the motor generally operates at a high frequency, and the first driving circuit 110 and the second driving circuit 130 simultaneously supply power to the three-phase winding 100. It is understood that the above-mentioned middle-low frequency operation and high frequency operation are based on the relative judgment between the two connection modes, and no limitation is made on the specific operating frequency.
In an embodiment, the first power supply circuit and the second power supply circuit are arranged in common ground and in common bus, which is beneficial to improving the stability of operation. The first power supply circuit includes a buck circuit 150, the second power supply circuit includes a boost circuit 160, the first power supply circuit and the second power supply circuit may further include a power supply component 140, the power supply component 140 is connected to the buck circuit 150 and the boost circuit 160, respectively, and the buck circuit 150 and the boost circuit 160 may be provided with input voltages by the power supply component 140. When the three-phase winding 100 is switched to the delta connection, the voltage reduction circuit 150 provides a first power supply voltage for the first driving circuit 110; when the three-phase winding 100 is switched to the open winding connection, the voltage boosting circuit 160 provides the second driving circuit 130 with the second supply voltage, and the voltage reducing circuit 150 provides the first driving circuit 110 with the first supply voltage. In the case where the input voltage supplied from the power supply module 140 is not changed, the voltage-reducing circuit 150 performs voltage-reducing conversion on the power supply voltage to obtain the first power supply voltage, and the voltage-increasing circuit 160 performs voltage-increasing conversion on the power supply voltage to obtain the second power supply voltage.
The number of the power supply components 140 may be one, and the power supply components simultaneously supply power to the voltage reduction circuit 150 and the voltage increase circuit 160. Referring to fig. 2, in an embodiment, the power supply assembly 140 comprises a first power supply pack 141 and a second power supply pack 142, the first power supply pack 141 comprises the first power supply pack 141 and a buck circuit 150, the first power supply pack 141 is connected to the buck circuit 150, the second power supply pack 142 comprises the second power supply pack 142 and a boost circuit 160, and the second power supply pack 142 is connected to the boost circuit 160. By providing the first power supply group 141 and the second power supply group 142, the voltage step-down circuit 150 and the voltage step-up circuit 160 can be supplied with power, respectively, which is advantageous for improving flexibility.
It is understood that the voltage-reducing circuit 150 and the voltage-increasing circuit 160 can be disposed at the same time or alternatively.
Referring to fig. 3, in an embodiment, the step-down circuit 150 is a step-down chopper circuit, and includes a first switching tube Q1, a second switching tube Q2, a first inductor L1, a first capacitor C1, a first diode D1, and a second diode D2, wherein an anode of the power module 140, a drain of the first switching tube Q1, a source of the first switching tube Q1, and the first inductor L1 are sequentially connected in series and then connected to the first driving circuit 110, a source of the first switching tube Q1, a drain of the second switching tube Q2, and a cathode of the power module 140 are sequentially connected in series, a source of the first switching tube Q1, the first inductor L1, the first capacitor C1, and a cathode of the power module 140 (ground) are sequentially connected in series, a cathode of the power module 140 is connected to the first driving circuit 110, the first diode D1 is connected in inverse-parallel to the first switching tube Q1, and the second diode D2 is connected in inverse-parallel to the second switching tube Q2. The second switch Q2 is used as the first freewheeling element, and the first freewheeling element may be formed by removing the second switch Q2 and separately providing it as the second diode D2.
When the voltage reducing circuit 150 works, the second switching tube Q2 is controlled to be switched off, and when the first switching tube Q1 is switched on, the power supply pack 1 component 140 charges the first inductor L1 and simultaneously charges the first capacitor C1 to provide electric energy for the first driving circuit 110; when the first switch Q1 is turned off, the first inductor L1 discharges through the second diode D2, the current of the first inductor L1 decreases linearly, the power output to the first driving circuit 110 is maintained by the first capacitor C1, and thus the voltage output to the first driving circuit 110 is lower than the voltage provided by the power module 140, thereby achieving the voltage reduction effect.
Referring to fig. 4, in an embodiment, the boost circuit 160 is a boost chopper circuit, and includes a third switching tube Q3, a fourth switching tube Q4, a second inductor L2, a second capacitor C2, a third diode D3, and a fourth diode D4, an anode of the power module 140, a second inductor L2, a source of the third switching tube Q3, and a drain of the first switching tube Q1 are sequentially connected in series and then connected to the second driving circuit 130, a second inductor L2, a drain of the fourth switching tube Q4, a source of the fourth switching tube Q4, and a cathode (ground) of the power module 140 are sequentially connected in series, a drain of the third switching tube Q3, a drain of the second capacitor C2, and a cathode of the power module 140 are sequentially connected in series, a cathode of the power module 140 is connected to the second driving circuit 130, a third diode D3 is connected in inverse parallel to the third switching tube Q3, and a fourth diode D4 is connected in inverse parallel to the fourth switching tube Q4. The third switching tube Q3 is used as the second freewheeling element, and the second freewheeling element may be provided with the third switching tube Q3 removed and separately provided as the third diode D3. In addition, the boosting circuit 160 may be a totem-pole circuit.
When the boost circuit 160 is in operation, the third switching tube Q3 is controlled to be turned off, and when the fourth switching tube Q4 is turned on, the power supply module 140 charges the second inductor L2; when the fourth switching tube Q4 is turned off, the power supply module 140 charges the second capacitor C2; therefore, the electric power finally output to the second driving circuit 130 is provided by the second capacitor C2 and the second inductor L2 at the same time, so that the voltage output to the second driving circuit 130 is higher than the voltage provided by the power module 140, and a boosting effect is achieved.
Based on the voltage-reducing circuit 150 described above, when the three-phase winding 100 is switched to the open winding connection, the first drive circuit 110 and the second drive circuit 130 simultaneously supply power to the three-phase winding 100. Since the first driving voltage is stepped down, the efficiency of the three-phase winding 100 is reduced. Therefore, when the three-phase winding 100 is switched to the open winding connection, the first switching tube Q1 can be controlled to be continuously conducted, the second switching tube Q2 can be continuously disconnected, at this time, the first inductor L1 and the first capacitor C1 form an LC filter circuit, and in this state, the output voltage of the first driving circuit 110 is the second driving voltage, so that the voltage reduction effect of the voltage reduction circuit 150 almost disappears, the voltage utilization efficiency of the power supply module 140 is improved, and the three-phase winding 100 in the open winding connection state operates more efficiently.
Therefore, by arranging the switch assembly 120, the connection mode of the three-phase winding 100 can be switched according to different working frequencies of the motor, and the operation efficiency of the motor is improved; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit 110 and second drive circuit 130 respectively, first drive circuit 110 and second drive circuit 130 provide corresponding drive voltage to three-phase winding 100 when three-phase winding 100 is in different connection state respectively again for three-phase winding 100 all can obtain suitable drive voltage when being in different connection state, in order to realize that the motor homoenergetic is high-efficient to be operated at different connected modes.
In addition, the switch assembly 120 is generally mechanical, and the closing or opening of the switch assembly needs a certain time period to complete, and if the connection mode is switched by using the existing scheme, the permanent magnet motor needs to be stopped for a short time, thereby affecting the normal operation of the compressor. Therefore, the second drive circuit 130 supplies the fourth drive voltage to the three-phase winding during the switching of the connection state of the three-phase winding 100, and the fourth drive voltage is used for keeping the motor running during the switching of the connection state of the three-phase winding 100, and in this embodiment, the motor running during the switching of the connection state of the three-phase winding 100 refers to the motor running with electricity rather than running with inertia. Referring to fig. 5, the second driving circuit 130 is provided in the embodiment of the present invention, so that the three-phase winding 100 enters the transition state when the delta connection is switched to the open winding connection. When the three-phase winding 100 is in the delta connection, the first driving circuit 110 provides the first driving voltage, the second driving circuit 130 is turned off, and the first switch group 121 is closed. Then, entering a transition state, wherein in the transition state, in the phase I, the state of the control switch assembly 120 is unchanged, the second driving circuit 130 outputs the three-phase voltage in the delta connection, and in this phase, the motor is still in the delta connection state for operation; in the phase II, the first switch set 121 and the second drive circuit 130 are controlled to output the delta-connected three-phase voltage (i.e., the first drive voltage) and continue for the first time threshold, and in this phase, because the second drive circuit 130 outputs the delta-connected three-phase voltage, even if the first switch set 121 is disconnected, the motor can still operate in the delta-connected state, and in addition, because a certain time period is required for the first switch set 121 to be disconnected from being closed, the first time threshold needs to be continued, and the first time threshold may be the action time period of the first switch set 121. Finally, the first switch group 121 completes the turn-off operation, controls the first driving circuit 110 to output the second driving voltage, controls the second driving circuit 130 to output the third driving voltage, and completes the switching of the three-phase winding 100 from the delta connection to the open winding connection. In summary, the second driving circuit 130 can increase the transient state when the three-phase winding 100 is switched from the delta connection to the open winding connection, thereby realizing the non-stop switching.
The principle of switching the three-phase winding 100 from open winding connection to delta connection is similar to the process described above. When the three-phase winding 100 is in the open winding connection, the first driving circuit 110 provides the second driving voltage, the second driving circuit 130 provides the third driving voltage, and the first switch group 121 is turned off. Then, entering a transition state, wherein in the transition state, in a phase II, the state of the first switch group 121 is controlled to be unchanged, and the second driving circuit 130 outputs a three-phase voltage (at this time, a first driving voltage) in a delta connection, and in this phase, the motor is still in an open winding connection state to operate; in the phase I, the first switch set 121 is controlled to be closed, the second driving circuit 130 outputs the three-phase voltage in the delta connection, and the first time threshold is maintained, in this phase, because the second driving circuit 130 outputs the three-phase voltage in the delta connection, in the process of closing the first switch set 121, the three-phase winding 100 is already in the delta connection state, that is, the motor can keep running, because a certain time period is required for the first switch set 121 to be closed from being opened, the first time threshold needs to be maintained, and the first time threshold may be the action time period of the first switch set 121. Finally, the first switch group 121 completes the closing action, controls the first driving circuit 110 to output the first driving voltage, controls the second driving circuit 130 to stop, and completes the switching from the open winding connection to the delta connection for the three-phase winding 100. In summary, with the second driving circuit 130, a transition state can be added when the three-phase winding 100 is switched from the open winding connection to the delta connection, thereby realizing the non-stop switching.
In addition, in an embodiment, after the three-phase winding 100 is switched from the open winding connection to the delta connection, the second driving circuit 130 may also continue to supply power to control the first driving circuit 110 to be turned off, so as to enable the motor to operate efficiently.
It should be added that the fourth driving voltage is a three-phase voltage of the three-phase winding 100 in the delta connection state, so that the transition of the three-phase winding 100 in the switching process of delta connection and open winding connection is smoother and more stable. It will be appreciated by those skilled in the art that the fourth drive voltage may also be set to other voltage values during switching.
In summary, when the connection manner of the three-phase winding 100 is switched, the second driving circuit 130 can provide the fourth driving voltage for the three-phase winding 100 in the switching process of the connection state of the three-phase winding 100 to simulate the voltage environment of the first switch group 121 in the switching process, so that, when the connection manner is switched, even if the first switch group 121 changes the on-off state, the motor still operates normally, the non-stop switching of the connection manner of the three-phase winding 100 of the motor can be realized, and the normal operation of the compressor is not affected.
In an embodiment, referring to fig. 6, based on the driving control circuit shown in fig. 1, the switch assembly may further include a second switch group 122 and a third switch group 123, the second switch group 122 is connected to the first three-phase outgoing line group, the third switch group 123 is connected to the second three-phase outgoing line group, the second switch group 122 is closed, the first switch group 121 and the third switch group 123 are both open, the first driving circuit 110 provides the first driving voltage to the three-phase winding 100, and the three-phase winding 100 is switched to the first star connection; the first switch group 121 is closed, the second switch group 122 and the third switch group 123 are both opened, the first driving circuit 110 provides a first driving voltage to the three-phase winding 100, and the three-phase winding 100 is switched to the first delta connection; the third switch group 123 is closed, the first switch group 121 and the second switch group 122 are both opened, the second driving circuit 130 supplies a third driving voltage to the three-phase winding 100, and the three-phase winding 100 is switched to the second star connection; the first switch group 121 is closed, the second switch group 122 and the third switch group 123 are both opened, the second driving circuit 130 provides a third driving voltage to the three-phase winding 100, and the three-phase winding 100 is switched to the second delta connection; the first switch group 121, the second switch group 122, and the third switch group 123 are all turned off, the first driving circuit 110 supplies the second driving voltage to the three-phase winding 100, the second driving circuit 130 supplies the third driving voltage to the three-phase winding 100, and the three-phase winding 100 is switched to the open winding connection.
By arranging the second switch group 122 and the third switch group 123, the first switch group 121, the second switch group 122 and the third switch group 123 are switched to provide corresponding driving voltages in cooperation with the first driving circuit 110 and the second driving circuit 130 in different connection states of the three-phase winding 100, so that the three-phase winding 100 can realize first star connection, second star connection, first delta connection, second delta connection and open winding connection, and the connection state of the three-phase winding 100 is switched according to the working frequency of the motor in a more detailed manner, which is beneficial to further improving the operating efficiency of the motor.
In an embodiment, the second switch group 122 includes a fourth switch K4 and a fifth switch K5, the fourth switch K4 is connected to the first pin M1 and the second pin M2, respectively, and the fifth switch K5 is connected to the second pin M2 and the third pin M3, respectively; the third switch group 123 includes a seventh switch K7 and an eighth switch K8, the seventh switch K7 is connected to the fourth pin M4 and the fifth pin M5, respectively, and the eighth switch K8 is connected to the fifth pin M5 and the sixth pin M6, respectively. When the fourth switch K4 and the fifth switch K5 are simultaneously closed, 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; likewise, when the seventh switch K7 and the eighth switch K8 are simultaneously closed, 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 the second star connection state.
In an embodiment, referring to fig. 7, the second switch group 122 may also include a fourth switch K4, a fifth switch K5 and a sixth switch K6, wherein one ends of the fourth switch K4, the fifth switch K5 and the sixth switch K6 are connected to each other, and the other ends of the fourth switch K4, the fifth switch K5 and the sixth switch K6 are respectively connected to the first pin M1, the second pin M2 and the third pin M3; the third switch group 123 includes a seventh switch K7, an eighth switch K8 and a ninth switch K9, one ends of the seventh switch K7, the eighth switch K8 and the ninth switch K9 are connected to each other, and the other ends of the seventh switch K7, the eighth switch K8 and the ninth switch K9 are respectively and correspondingly connected to the fourth pin M4, the fifth pin M5 and the sixth pin M6. When the fourth switch K4, the fifth switch K5, and the sixth switch K6 are simultaneously closed, 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; likewise, when the seventh switch K7, the eighth switch K8, and the ninth switch K9 are simultaneously closed, the fourth pin M4, the fifth pin M5, and the sixth pin M6 are connected to each other such that the three-phase winding 100 is in the second star connection state.
In an embodiment, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8, and the ninth switch K9 may be selected from an electromagnetic relay, a solid-state relay, a contactor, or an electronic switch, so that the advantages of stable switching and low cost are achieved. In an embodiment, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8, and the ninth switch K9 are all single-pole single-throw relays. It should be added that if the electronic switch is selected, its on-resistance does not exceed 1 ohm.
Similarly, the three-phase winding 100 enters the transition state when switched from the first star connection to the first delta connection. Referring to fig. 8, when the three-phase winding 100 is in the first star connection, the first driving circuit 110 provides the first driving voltage, the second driving circuit 130 is turned off, the second switch group 122 is closed, and the first switch group 121 is opened. Then, a transition state is entered, wherein in the transition state, in a phase III, the states of the first switch group 121 and the second switch group 122 are controlled to be unchanged, the second drive circuit 130 outputs the neutral point voltage of the first star connection, and in this phase, the motor is still in the first star connection state operation; in the stage IV, the second switch group 122 is controlled to be opened, the state of the first switch group 121 is unchanged, the second drive circuit 130 outputs the first star-connected neutral point voltage, and the second time threshold continues, in this stage, because the second drive circuit 130 outputs the first star-connected neutral point voltage, the motor can still operate in the first star-connected state even if the second switch group 122 is opened, and in addition, because a certain time period is required for the second switch group 122 to be opened from being closed, the second time threshold continues, and the second time threshold can be the action time period of the second switch group 122; in the V stage, the second switch group 122 completes the disconnection action, and controls the first switch group 121 to be in a constant state, and the second driving circuit 130 outputs the three-phase voltage of the first delta connection (at this time, the first driving voltage), in this stage, because the first switch group 121 and the second switch group 122 do not act, the second driving circuit 130 changes the neutral point voltage of the first star connection into the three-phase voltage of the first delta connection, and in this stage, the motor is still in a normal power supply state, so that the operation can be maintained; in the VI stage, the state of the second switch group 122 is controlled to be unchanged, the first switch group 121 is controlled to be closed, the second drive circuit 130 outputs the three-phase voltage of the first delta connection, and the second time threshold continues, because the second drive circuit 130 outputs the three-phase voltage of the first delta connection, in the closing process of the second switch group 122, the three-phase winding 100 is already in the first delta connection state, that is, the motor can keep running, because a certain time duration is required for the second switch group 122 to be closed from being opened, the second time threshold needs to be continued, and the second time threshold may be the action time duration of the second switch group 122. Finally, the second switch group 122 completes the closing action, controls the second driving circuit 130 to stop, and the three-phase winding 100 completes the switching from the first star connection to the first delta connection. In summary, with the second driving circuit 130, a transition state can be added when the three-phase winding 100 is switched from the first star connection to the first delta connection, thereby achieving non-stop switching.
Similarly, when the three-phase winding 100 is switched from the second star connection to the second delta connection, the principle is similar to that described above, except that when the second star connection is switched to the second delta connection, the voltage environment of the first switch group 121 and the third switch group 123 is simulated by the first driving circuit 110 (i.e., the fourth driving voltage is provided), and the third driving voltage is provided to the three-phase winding 100 by the second driving circuit 130 after the switching is completed.
The principle of switching the three-phase winding 100 from the first delta connection to the first star connection is similar to the process described above. When the three-phase winding 100 is in the first delta connection, the first driving circuit 110 supplies power (provides the first driving voltage), the second switch set 122 is opened, and the first switch set 121 is closed. Then, entering a transition state, wherein in the transition state, in a VI stage, the states of the first switch group 121 and the second switch group 122 are controlled to be unchanged, the second driving circuit 130 outputs the three-phase voltage of the first delta connection, and in this stage, the motor is still in the first delta connection state for operation; in the V stage, the second switch set 122 is controlled to be in a constant state, the first switch set 121 is controlled to be disconnected, the second drive circuit 130 outputs the three-phase voltage of the first delta connection, and the second time threshold continues, in this stage, because the second drive circuit 130 outputs the three-phase voltage of the first delta connection, even if the first switch set 121 is disconnected, the motor can still operate in the first delta connection state, in addition, because a certain time duration is required for the first switch set 121 to be disconnected from being closed, the first time threshold continues, and the first time threshold may be the action time duration of the first switch set 121; in the stage IV, the first switch group 121 completes the disconnection operation, controls the second switch group 122 to have a constant state, and controls the second driving circuit 130 to output the neutral point voltage of the first star connection, in this stage, since the first switch group 121 and the second switch group 122 do not operate, the second driving circuit 130 changes the three-phase voltage of the first delta connection into the neutral point voltage of the first star connection, and in this stage, the motor is still in the normal power supply state, so that the motor can keep running; in the phase III, the second switch set 122 is controlled to be closed, the state of the first switch set 121 is unchanged, the second drive circuit 130 outputs the neutral point voltage of the first star connection, and the second time threshold continues, and since the second drive circuit 130 outputs the neutral point voltage of the first star connection, during the closing of the second switch set 122, the three-phase winding 100 is already in the first star connection state, that is, the motor can keep running, and since a certain time period is required for the second switch set 122 to be closed from being opened, the second time threshold continues, and the second time threshold may be the action time period of the second switch set 122. Finally, the second switch group 122 completes the closing action, controls the second driving circuit 130 to stop, and the three-phase winding 100 completes the switching from the first delta connection to the first star connection. In summary, with the second driving circuit 130, a transition state can be added when the three-phase winding 100 is switched from the first delta connection to the first star connection, thereby achieving non-stop switching.
Similarly, when the three-phase winding 100 is switched from the second delta connection to the second star connection, the principle is similar to that described above, except that when the second delta connection is switched to the second star connection, the voltage environment of the first switch group 121 and the third switch group 123 is simulated by the first driving circuit 110 (i.e., the fourth driving voltage is provided), and the third driving voltage is provided to the three-phase winding 100 by the second driving circuit 130 after the switching is completed.
In addition, in an embodiment, when the three-phase winding 100 is switched from the first delta connection to the second delta connection, the transition principle of the switching process is similar to that when the first delta connection is switched to the first star connection, except that the second driving circuit 130 is not turned off after the switching is completed, the third driving voltage is provided for supplying power to the three-phase winding 100, and the first driving circuit 110 is turned off, and since the third driving voltage is greater than the first driving voltage, the operating frequency of the motor is higher in the second star connection than in the first delta connection, and the principle of the three-phase winding 100 is switched from the second star connection to the first delta connection is similar. In addition, the transition principle of the three-phase winding 100 from the second delta connection to the open winding connection is explained in the above embodiment, and is not described in detail herein.
In summary, when the three-phase winding 100 is switched between the star connection and the delta connection, the fourth drive voltage may also be the neutral point voltage of the star connection. The fourth driving voltage is a three-phase voltage in which the three-phase winding 100 is in star connection or in delta connection, and the transition of the three-phase winding 100 in the switching process can be smoother and more stable. It will be appreciated by those skilled in the art that the fourth drive voltage may also be set to other voltage values during switching.
Referring to fig. 9 and 10, in an embodiment, each of first driving circuit 110 and second driving circuit 130 includes a first leg 910, a second leg 920, and a third leg 930 that are connected in parallel, each of first leg 910, second leg 920, and third leg 930 includes two fifth switching tubes Q5 connected in series, and fifth switching tube Q5 is connected in anti-parallel with a fifth diode D5. The fifth switching tube Q5 may be a MOS tube as shown in fig. 9, or an IGBT tube as shown in fig. 10. The first power supply voltage and the second power supply voltage are both direct current signals, the first bridge arm 910, the second bridge arm 920 and the third bridge arm 930 form a three-phase bridge structure, and by controlling the on-off state of the six fifth switching tubes Q5, the first driving circuit 110 and the second driving circuit 130 can both output sine wave alternating current signals for driving the motor to operate, that is, the first driving voltage and the second driving voltage can be provided for the three-phase winding 100, and similarly, the first driving circuit 110 and the second driving circuit 130 can also output neutral point voltage of the three-phase winding 100 in a star connection state, or three-phase voltage of the three-phase winding 100 in a triangle connection state, and the second driving circuit 130 outputs third driving voltage. Referring to fig. 1, correspondingly, three output terminals a1, B1 and C1 of the first driving circuit 110 are respectively connected to the sixth pin M6, the fifth pin M5 and the fourth pin M4 of the three-phase winding 100, and three output terminals a2, B2 and C2 of the second driving circuit 130 are respectively connected to the first pin M1, the second pin M2 and the third pin M3 of the three-phase winding 100. Illustratively, SPWM may be adopted as a driving signal for driving the first driving circuit 110, which may effectively reduce harmonic components of the output voltage and the output current, and improve the output waveform, so that the first driving circuit 110 outputs a sine wave ac signal, that is, the first driving voltage may be provided to the three-phase winding 100 (the second driving circuit 130 is the same). When the SPWM is used as a driving signal for driving the first driving circuit 110, when the three-phase winding 100 is in the star connection, the neutral point voltage is zero voltage, and correspondingly, the three output terminals a2, B2 and C2 of the second driving circuit 130 can be adjusted to the PWM output with the duty ratio of 50%, i.e. the star-connected neutral point voltage can be provided for the three-phase winding 100. The second drive circuit 130 outputs a three-phase voltage having a triangular shape, that is, the output terminal a2 of the second drive circuit 130 outputs the same voltage as the output terminal C1 of the first drive circuit 110, the output terminal B2 of the second drive circuit 130 outputs the same voltage as the output terminal a1 of the first drive circuit 110, and the output terminal C2 of the second drive circuit 130 outputs the same voltage as the output terminal B1 of the first drive circuit 110. It is understood by those skilled in the art that the first driving voltage, the second driving voltage, and the third driving voltage may be adjusted according to the connection state of the three-phase windings.
In one embodiment, the power module 140 includes an ac power source 143 and a rectifying module 144 for converting the ac power source 143 into a dc output, the ac power source 143 is connected to the rectifying module 144, and the rectifying module 144 is connected to the buck circuit 150 and the boost circuit 160, respectively. By providing the rectifying component 144, the ac power source 143 can be converted to a dc output to adapt to the input signal requirements of the buck circuit 150 and the boost circuit 160. It will be appreciated that the first power pack 141 and the second power pack 142 may each include an ac power source 143 and a rectifying component 144 for converting the ac power source 143 into a dc output.
In an embodiment, the control of the first driving circuit 110, the switching component 120, the second driving circuit 130, the voltage reducing circuit 150, and the voltage boosting circuit 160 may be implemented by using a controller, for example, a single chip microcomputer.
Referring to fig. 11, an embodiment of the present invention further provides a driving control method, which is applied to the driving control circuit in fig. 1 or fig. 2, and the driving control method includes, but is not limited to, the following steps:
step 1101: controlling the switch assembly to be opened and closed so as to enable the three-phase winding to switch the connection state;
step 1102: and controlling the first driving circuit and the second driving circuit to start or stop working so that the first driving circuit or the second driving circuit provides driving voltage for the three-phase windings in the corresponding connection state.
For example, the first driving circuit is powered by the voltage reduction circuit, and the second driving circuit is powered by the voltage boost circuit, so that the driving voltage output by the first driving circuit is lower than the driving voltage output by the second driving circuit, and the first driving voltage and the second driving voltage are explained in the above embodiment of the driving control circuit, and are not described again here.
Wherein the switching of the connection state of the three-phase winding has at least the following possible situations:
one is to switch the three-phase winding to delta connection, in this case, in the step 1102, the controlling the first driving circuit and the second driving circuit to start or stop working, so that the first driving circuit or the second driving circuit provides driving voltage to the three-phase winding in the corresponding connection state, including:
and controlling the first driving circuit to start working and controlling the second driving circuit to stop working so that the first driving circuit provides a first driving voltage for the three-phase winding in the delta connection state.
When the three-phase winding is switched from open winding connection to delta connection, the first driving circuit provides first driving voltage for the three-phase winding, and the second driving circuit stops working, so that proper driving voltage can be obtained when the three-phase winding is in delta connection.
Another is that the three-phase winding is switched to the open winding connection, in this case, in the step 1102, controlling the first driving circuit and the second driving circuit to start or stop working, so that the first driving circuit or the second driving circuit provides the driving voltage to the three-phase winding in the corresponding connection state, including:
and controlling the first driving circuit to start working and the second driving circuit to start working so that the first driving circuit provides a second driving voltage for the three-phase windings in the open winding connection state, and the second driving circuit provides a third driving voltage for the three-phase windings in the open winding connection state.
When the three-phase winding is switched from the delta connection to the open winding connection, the first driving circuit provides a second driving voltage for the three-phase winding, and the second driving circuit provides a third driving voltage for the three-phase winding, so that a proper driving voltage can be obtained when the three-phase winding is in the open winding connection.
The three-phase winding is switched to the connection state by controlling the on-off of the switch assembly, so that the connection mode of the three-phase winding can be switched according to different working frequencies of the motor, and the running efficiency of the motor is improved; the first driving circuit and the second driving circuit are controlled to start or stop working, so that the first driving circuit or the second driving circuit provides driving voltage for the three-phase winding in the corresponding connection state, the three-phase winding can obtain suitable driving voltage in different connection states, and the motor can efficiently run in different connection modes.
Referring to fig. 12, in an embodiment, an embodiment of the present invention further provides a driving control method, and on the basis of the driving control method of the above embodiment, the method further includes the following steps:
step 1201: and controlling the second driving circuit to supply a fourth driving voltage to the three-phase windings during the switching of the connection state of the three-phase windings.
The switch assembly is generally mechanical, and the closing or opening action of the switch assembly needs a certain time to be completed, and if the existing scheme is utilized to switch the connection mode, the permanent magnet motor needs to be stopped for a short time, so that the normal operation of the compressor is influenced. Therefore, when the connection mode of the three-phase winding is switched, the second driving circuit is controlled to provide the fourth driving voltage for the three-phase winding in the switching process of the connection state of the three-phase winding so as to simulate the voltage environment of the first switch group in the switching process, therefore, when the connection mode is switched, even if the first switch group changes the switching state, the motor still normally operates, the non-stop switching of the connection mode of the three-phase winding of the motor can be realized, and the normal operation of the compressor is not influenced.
The three-phase voltages of the three-phase windings in the delta connection state are explained in the above embodiment of the driving control circuit, and are not described herein again.
Referring to fig. 5 and 13, when the first connection state is delta connection and the second connection state is open winding connection, in step 1201, controlling the second driving circuit to provide the fourth driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding specifically includes the following steps:
step 1301: the three-phase windings are in triangular connection, and the second driving circuit is controlled to output three-phase voltage of the three-phase windings in a triangular connection state;
step 1302: the first switch group is controlled to be disconnected, and the second driving circuit outputs three-phase voltage of the three-phase winding in a triangular connection state for a first time threshold value;
step 1303: and controlling the first driving circuit to output a second driving voltage and controlling the second driving circuit to output a third driving voltage.
Specifically, in step 1301, the motor is still running in a delta connection state; in step 1202, the second driving circuit is controlled to simulate three-phase voltages of the three-phase winding in the delta connection state, and the motor can still operate in the delta connection state even if the first switch group is disconnected, wherein the first time threshold value can be the action duration of the first switch group. In step 1303, the first driving circuit is controlled to output the second driving voltage, and the second driving circuit outputs the third driving voltage. It can be seen that the non-stop switching of the motor can be realized through the above steps 1301 and 1303. After the switching is completed, the first driving circuit and the second driving circuit jointly supply power to the three-phase winding.
Referring to fig. 5 and 14, when the first connection state is open winding connection and the second connection state is delta connection, in the step 1201, controlling the second driving circuit to provide the fourth driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding specifically includes the following steps:
step 1401: the three-phase winding keeps open winding connection and controls the second driving circuit to output three-phase voltage when the three-phase winding is in a triangular connection state;
step 1402: controlling the first switch group to be closed, and outputting three-phase voltage of the three-phase winding in a triangular connection state by the second driving circuit for a first time threshold value;
step 1403: and controlling the first driving circuit to output the first driving voltage and controlling the second driving circuit to stop working.
Specifically, in step 1401, the motor is still operating in an open winding connection state; in step 1402, the second driving circuit is controlled to simulate three-phase voltages of the three-phase winding in the delta connection state, that is, during the closing process of the first switch set, the three-phase winding may be operated in the delta connection state first, wherein the first time threshold may be an action duration of the first switch set. In step 1403, the first driving circuit is controlled to output the first driving voltage, and thus, through the above steps 1401 and 1403, non-stop switching of the motor can be realized. After the switching is finished, the second driving circuit stops working, and the first driving circuit supplies power to the three-phase winding; or the first driving circuit stops working, and the second driving circuit supplies power to the three-phase winding.
The second driving circuit is controlled to provide the fourth driving voltage for the three-phase winding in the switching process of the connection state of the three-phase winding so as to simulate the voltage environment of the first switch group in the switching process, therefore, when the connection mode is switched, even if the first switch group changes the switching state, the motor still normally operates, the non-stop switching of the connection mode of the three-phase winding of the motor can be realized, and the normal operation of the compressor is not influenced.
In an embodiment, based on the driving control circuit shown in fig. 6 or fig. 7, the driving control method provided by the present invention may further include the following steps:
controlling the second switch group to be closed, and controlling the first switch group and the third switch group to be opened so as to switch the three-phase winding to be in the first star connection; controlling the first driving circuit to start working and controlling the second driving circuit to stop working so that the first driving circuit provides a first driving voltage for the three-phase winding under the first star connection state;
controlling the first switch group to be closed, the second switch group and the third switch group to be opened so as to switch the three-phase winding to be connected with the first triangle; controlling the first driving circuit to start working and controlling the second driving circuit to stop working so that the first driving circuit provides a first driving voltage for the three-phase winding in the first delta connection state;
controlling the third switch group to be closed and the first switch group and the second switch group to be opened so as to switch the three-phase winding to be in the second star connection; controlling the first driving circuit to stop working, and controlling the second driving circuit to start working so that the second driving circuit provides a third driving voltage for the three-phase winding in the second star connection state;
controlling the first switch group to be closed, the second switch group and the third switch group to be opened so as to switch the three-phase winding to be in second triangular connection; controlling the first driving circuit to stop working, and controlling the second driving circuit to start working so that the second driving circuit provides a third driving voltage for the three-phase winding in the second delta connection state;
the first switch group, the second switch group and the third switch group are controlled to be disconnected so that the three-phase winding is switched to be connected with the open winding; and controlling the first driving circuit to start working and the second driving circuit to start working so that the first driving circuit provides a second driving voltage for the three-phase windings in the open winding connection state, and the second driving circuit provides a third driving voltage for the three-phase windings in the open winding connection state.
Utilize the switching of first switch group, second switch group and third switch group, cooperation first drive circuit and second drive circuit provide corresponding driving voltage under the different connection status of three-phase winding for three-phase winding can realize first star connection, second star connection, first triangular connection, second triangular connection and open the winding and connect, thereby more meticulous when making the connection status that switches three-phase winding according to the operating frequency of motor, be favorable to further improving the operating efficiency of motor.
It can be understood that based on the driving control circuit in fig. 6 or fig. 7, during the process of sequentially switching the first star connection, the second star connection, the first delta connection, the second delta connection, and the open winding connection, the transition process in the above embodiment may also be used to implement non-stop switching, and details are not repeated here.
In an embodiment, based on the driving control circuit of fig. 1 or fig. 2, referring to fig. 15, the connection manner of the three-phase windings may be switched according to the operating frequency of the motor, and specifically, one or more of the following determination manners may be included in combination:
controlling the switching of the switch assembly to switch the three-phase winding to triangular connection according to the fact that the working frequency of the motor is lower than a first frequency threshold;
and controlling the opening and closing of the switch assembly to switch the three-phase winding to be connected with the open winding according to the condition that the working frequency of the motor is higher than a second frequency threshold value.
The first frequency threshold is equal to the second frequency threshold, the three-phase winding is switched to the corresponding connection state according to the working frequency of the motor by judging the working frequency of the motor, the motor can operate in a connection mode matched with the working frequency, and the operation efficiency of the motor is improved. It is understood that the first frequency threshold may be determined according to the actual operation condition of the motor, and is not limited herein.
In an embodiment, based on the driving control circuit of fig. 1, referring to fig. 16, the connection manner of the three-phase windings is switched according to the operating frequency of the motor, and a first frequency threshold and a second frequency threshold may be set, where the first frequency threshold is smaller than the second frequency threshold, and specifically, one or more of the following determination manners may be included in combination:
controlling the switching of the switch assembly to switch the three-phase winding to triangular connection according to the fact that the working frequency of the motor is lower than a first frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to open winding connection according to the fact that the working frequency of the motor is higher than a second frequency threshold;
when the working frequency of the motor is judged, the first frequency threshold value and the second frequency threshold value can form a hysteresis interval, so that the phenomenon that the connection state of the motor is frequently switched can be avoided, and the running stability of the motor is ensured. The first frequency threshold and the second frequency threshold may be determined according to the actual operation condition of the motor, and are not limited herein.
In an embodiment, based on the driving control circuit of fig. 6 or fig. 7, referring to fig. 17, the connection manner of the three-phase windings may be switched according to the operating frequency of the motor, and specifically, one or more of the following determination manners may be included in combination:
controlling the switching of the switching assembly to switch the three-phase winding to the first star connection according to the operating frequency of the motor being lower than a third frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the first triangular connection according to the fact that the working frequency of the motor is higher than the third frequency threshold and lower than a fourth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second star connection according to the operating frequency of the motor being higher than the fourth frequency threshold and lower than a fifth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second delta connection according to the fact that the working frequency of the motor is higher than the fifth frequency threshold and lower than a sixth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the operating frequency of the motor being higher than the sixth frequency threshold;
wherein the third frequency threshold, the fourth frequency threshold, the fifth frequency threshold, and the sixth frequency threshold increase sequentially.
Through judging the operating frequency of the motor, the three-phase winding is switched to the corresponding connection state according to the operating frequency of the motor, the motor can operate in a connection mode matched with the operating frequency, and the operating efficiency of the motor is improved. It is understood that the fourth frequency threshold, the fifth frequency threshold, the sixth frequency threshold, and the seventh frequency threshold may be determined according to the actual operation condition of the motor, and are not limited herein.
In an embodiment, based on the driving control circuit of fig. 6 or fig. 7, referring to fig. 18, the connection manner of the three-phase windings may be switched according to the operating frequency of the motor, and specifically, a combination of one or more of the following determination manners may also be included:
controlling the switching of the switching assembly to switch the three-phase winding to the first star connection according to the operating frequency of the motor being below a seventh frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the first delta connection according to the fact that the working frequency of the motor is higher than an eighth frequency threshold and lower than a ninth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second star connection according to the operating frequency of the motor being higher than a tenth frequency threshold and lower than an eleventh frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second delta connection according to the operating frequency of the motor being higher than a twelfth frequency threshold and lower than a thirteenth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the fact that the working frequency of the motor is higher than a fourteenth frequency threshold;
wherein the seventh frequency threshold, the eighth frequency threshold, the ninth frequency threshold, the tenth frequency threshold, the eleventh frequency threshold, the twelfth frequency threshold, the thirteenth frequency threshold and the fourteenth frequency threshold increase sequentially.
When the working frequency of the motor is judged, the seventh frequency threshold value and the eighth frequency threshold value can form a hysteresis interval, the ninth frequency threshold value and the tenth frequency threshold value can form a hysteresis interval, the eleventh frequency threshold value and the twelfth frequency threshold value can form a hysteresis interval, and the thirteenth frequency threshold value and the fourteenth frequency threshold value can form a hysteresis interval, so that the phenomenon that the connection state of the motor is frequently switched can be avoided, and the running stability of the motor is ensured.
It should be noted that the method in the above embodiment is only schematically applied to the driving control circuit shown in fig. 1, fig. 2, fig. 6, or fig. 7, and may also be applied to other similar circuits.
Referring to fig. 19, fig. 19 is a circuit board according to an embodiment of the present invention, including the driving control circuit in the above embodiment. Therefore, the circuit board can realize switching of the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch assembly, and the operation efficiency of the motor is improved; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit and second drive circuit respectively, first drive circuit and second drive circuit provide corresponding driving voltage to three-phase winding when three-phase winding is in different connection state respectively again for three-phase winding all can obtain suitable driving voltage when being in different connection state, in order to realize that the motor can the high-efficient operation at different connection mode homoenergetic.
Referring to fig. 20, another embodiment of the present invention further provides an air conditioner, where the air conditioner includes the circuit board in the above embodiment and a compressor, the compressor is driven by a permanent magnet motor, and the circuit board is used to control an operation mode of the permanent magnet motor. The air conditioner can realize switching of the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch assembly, so that the running efficiency of the motor is improved; through setting up first power supply circuit and second power supply circuit, can provide different supply voltage for first drive circuit and second drive circuit respectively, first drive circuit and second drive circuit provide corresponding driving voltage to three-phase winding when three-phase winding is in different connection state respectively again for three-phase winding all can obtain suitable driving voltage when being in different connection state, in order to realize that the motor can the high-efficient operation at different connection mode homoenergetic.
Referring to fig. 21, fig. 21 is a schematic diagram of an air conditioner according to an embodiment of the present invention. The air conditioner according to the embodiment of the present invention includes one or more processors 2101 and a memory 2102, and one processor 2101 and one memory 2102 are exemplified in fig. 21.
The processor 2101 and the memory 2102 may be connected by a bus or other means, such as a bus connection in fig. 21.
The memory 2102, 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 2102 may include a high-speed random access memory 2102, and may also include a non-transitory memory 2102, such as at least one disk storage device, flash memory component, or other non-transitory solid state storage device. In some embodiments, the memory 2102 may optionally include memory 2102 located remotely from the processor 2101, the remote memory 2102 may be connected to the operation control device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 21 does not constitute a limitation of an air conditioner and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
Non-transitory software programs and instructions required to implement the driving control method applied to the air conditioner in the above-described embodiment are stored in the memory 2102, and when executed by the processor 2101, the driving control method applied to the air conditioner in the above-described embodiment is performed, for example, the method steps 1101 to 1102 in fig. 11, the method step 1201 in fig. 12, the method steps 1301 to 1302 in fig. 13, and the method steps 1401 to 1402 in fig. 14 described above are performed.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium storing computer-executable instructions, which are executed by one or more processors 2101, for example, by one processor 2101 in fig. 21, and may cause the one or more processors 2101 to perform the driving control method in the above-described method embodiment, for example, perform the above-described method steps 1101 to 1102 in fig. 11, method step 1201 in fig. 12, method steps 1301 to 1302 in fig. 13, and method steps 1401 to 1402 in fig. 14.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims (27)

1. A drive control circuit for driving an open-winding motor having three-phase windings, one end of each of the phases of the windings constituting a first three-phase outgoing line group, and the other end of each of the phases of the windings constituting a second three-phase outgoing line group, the drive control circuit comprising:
the switch assembly comprises a first switch group, the first switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the three-phase winding is switched to be in triangular connection, the first switch group is disconnected, and the three-phase winding is switched to be in open winding connection;
the first driving circuit is connected with the second three-phase outgoing line group and used for providing a first driving voltage for the three-phase winding in a delta connection state and providing a second driving voltage for the three-phase winding in an open winding state, and the second driving voltage is larger than the first driving voltage;
the second driving circuit is connected with the first three-phase outgoing line group and used for providing a third driving voltage for the three-phase winding in the open winding connection state;
the first power supply circuit is connected with the first driving circuit and used for providing a first power supply voltage for the first driving circuit;
and the second power supply circuit is connected with the second driving circuit and used for providing a second power supply voltage for the second driving circuit.
2. The drive control circuit according to claim 1, characterized in that: the first power supply circuit includes a voltage step-down circuit.
3. The drive control circuit according to claim 1 or 2, characterized in that: the second power supply circuit includes a boost circuit.
4. The drive control circuit according to claim 1, characterized in that: the first power supply circuit and the second power supply circuit are arranged in a common ground and a common bus.
5. The drive control circuit according to claim 1, characterized in that: the second drive circuit supplies a fourth drive voltage to the three-phase winding during switching of the three-phase winding between the delta connection and the open winding connection, the fourth drive voltage being used to keep the motor running during switching of the three-phase winding connection state.
6. The drive control circuit according to claim 5, characterized in that: the fourth driving voltage is a three-phase voltage of the three-phase winding in a delta connection state.
7. The drive control circuit according to claim 1, characterized in that: the first switch group comprises a first switch, a second switch and a third switch, the three-phase winding comprises a first phase winding, a second phase winding and a third phase winding, the first phase winding comprises a first pin and a sixth pin, the second phase winding comprises a second pin and a fifth pin, the third phase winding comprises a third pin and a fourth pin, the first three-phase outgoing line group comprises the first pin, the second pin and the third pin, the second three-phase outgoing line group comprises the fourth pin, the fifth pin and the sixth pin, the first switch is respectively connected with the second pin and the sixth pin, the second switch is respectively connected with the third pin and the fifth pin, and the third switch is respectively connected with the first pin and the fourth pin.
8. The drive control circuit according to claim 1, characterized in that:
the switch assembly further comprises a second switch group and a third switch group, the second switch group is connected with the first three-phase outgoing line group, the third switch group is connected with the second three-phase outgoing line group, the second switch group is closed, the first switch group and the third switch group are both opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in first star connection; the first switch set is closed, the second switch set and the third switch set are both opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in a first triangular connection; the third switch set is closed, the first switch set and the second switch set are both open, the second drive circuit provides a third drive voltage to the three-phase winding, and the three-phase winding is switched to a second star connection; the first switch set is closed, the second switch set and the third switch set are both opened, the second driving circuit provides a third driving voltage for the three-phase winding, and the three-phase winding is switched to a second triangular connection; the first switch group, the second switch group and the third switch group are all disconnected, the first driving circuit provides second driving voltage for the three-phase winding, the second driving circuit provides third driving voltage for the three-phase winding, and the three-phase winding is switched to be connected with the open winding.
9. The drive control circuit according to claim 8, characterized in that:
the second switch group comprises a fourth switch and a fifth switch, the first three-phase outgoing line group comprises a first pin, a second pin and a third pin, the fourth switch is respectively connected with the first pin and the second pin, and the fifth switch is respectively connected with the second pin and the third pin;
and/or the presence of a gas in the gas,
the third switch group comprises a seventh switch and an eighth switch, the second three-phase outgoing line group comprises a fourth pin, a fifth pin and a sixth pin, the seventh switch is respectively connected with the fourth pin and the fifth pin, and the eighth switch is respectively connected with the fifth pin and the sixth pin.
10. The drive control circuit according to claim 8, characterized in that:
the second switch group comprises a fourth switch, a fifth switch and a sixth switch, the first three-phase outgoing line group comprises a first pin, a second pin and a third pin, one ends of the fourth switch, the fifth switch and the sixth switch are connected with each other, and the other ends of the fourth switch, the fifth switch and the sixth switch are respectively and correspondingly connected with the first pin, the second pin and the third pin;
and/or the presence of a gas in the gas,
the second switch group comprises a seventh switch, an eighth switch and a ninth switch, the second three-phase outgoing line group comprises a fourth pin, a fifth pin and a sixth pin, one ends of the seventh switch, the eighth switch and the ninth switch are connected with each other, and the other ends of the seventh switch, the eighth switch and the ninth switch are respectively and correspondingly connected with the fourth pin, the fifth pin and the sixth pin.
11. The drive control circuit according to claim 2, characterized in that:
the voltage reduction circuit is a voltage reduction chopper circuit, the voltage reduction chopper circuit comprises a first switch tube, a first follow current element, a first inductor, a first capacitor and a first diode, a drain electrode of the first switch tube, a source electrode of the first switch tube and the first inductor are sequentially connected in series and then connected with the first driving circuit, a source electrode of the first switch tube, the first follow current element and a reference ground are sequentially connected in series, a source electrode of the first switch tube, the first inductor, the first capacitor and the reference ground are sequentially connected in series, and the first diode is connected in inverse-parallel on the first switch tube.
12. The drive control circuit according to claim 3, characterized in that:
the booster circuit is a boost chopper circuit or a totem-pole circuit.
13. The drive control circuit according to claim 12, characterized in that:
the boost chopper circuit comprises a second follow current element, a fourth switch tube, a second inductor, a second capacitor and a fourth diode, the second inductor and the second follow current element are sequentially connected in series and then connected with the second driving circuit, the second inductor, a drain electrode of the fourth switch tube, a source electrode of the fourth switch tube and a reference ground are sequentially connected in series, the second follow current element, the second capacitor and the reference ground are sequentially connected in series, and the fourth diode is reversely connected in parallel to the fourth switch tube.
14. The drive control circuit according to claim 2, characterized in that:
the first power supply circuit further comprises a first power supply set, and the first power supply set is connected with the voltage reduction circuit.
15. The drive control circuit according to claim 3, characterized in that:
the second power supply circuit further comprises a second power supply set, and the second power supply set is connected with the booster circuit.
16. The drive control circuit according to claim 1, characterized in that:
the first driving circuit and the second driving circuit respectively comprise a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel, the first bridge arm, the second bridge arm and the third bridge arm respectively comprise two fifth switching tubes which are connected in series, and fifth diodes are reversely connected in parallel on the fifth switching tubes.
17. A drive control method applied to a drive control circuit for driving an open-winding motor having three-phase windings, one end of each of the phases of the windings constituting a first three-phase outgoing line group, and the other end of each of the phases of the windings constituting a second three-phase outgoing line group, the drive control circuit comprising:
the switch assembly comprises a first switch group, the first switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the three-phase winding is switched to be in triangular connection, the first switch group is disconnected, and the three-phase winding is switched to be in open winding connection;
the first driving circuit is connected with the second three-phase outgoing line group;
the second driving circuit is connected with the first three-phase outgoing line group;
the first power supply circuit is connected with the first driving circuit;
the second power supply circuit is connected with the second driving circuit;
the drive control method includes:
controlling the switching of the switching assembly to switch the connection state of the three-phase winding;
when the three-phase winding is switched to the delta connection, the first driving circuit is controlled to start working, and the second driving circuit is controlled to stop working, so that the first driving circuit provides a first driving voltage for the three-phase winding in the delta connection state;
when the three-phase winding is switched to the open winding connection state, controlling the first driving circuit to start working, and controlling the second driving circuit to start working, so that the first driving circuit provides a second driving voltage for the three-phase winding in the open winding connection state, and the second driving circuit provides a third driving voltage for the three-phase winding in the open winding connection state;
wherein the second driving voltage is greater than the first driving voltage.
18. The drive control method of claim 17, wherein the switch assembly further includes a second switch group and a third switch group, the second switch group being connected to the first three-phase outgoing line group, the third switch group being connected to the second three-phase outgoing line group, the drive control method further comprising at least one of:
controlling the second switch group to be closed, the first switch group and the third switch group to be opened so as to switch the three-phase winding to be in a first star connection; controlling the first driving circuit to start working, and controlling the second driving circuit to stop working, so that the first driving circuit provides a first driving voltage for the three-phase winding in the first star connection state;
controlling the first switch group to be closed, the second switch group and the third switch group to be opened so as to switch the three-phase winding to be connected in a first triangular mode; controlling the first driving circuit to start working, and controlling the second driving circuit to stop working so that the first driving circuit provides a first driving voltage for the three-phase winding in the first delta connection state;
controlling the third switch group to be closed, and the first switch group and the second switch group to be opened so as to switch the three-phase winding to be in a second star connection; controlling the first driving circuit to stop working, and controlling the second driving circuit to start working, so that the second driving circuit provides a third driving voltage for the three-phase winding in the second star connection state;
controlling the first switch group to be closed, the second switch group and the third switch group to be opened so as to switch the three-phase winding to be in second triangular connection; controlling the first driving circuit to stop working, and controlling the second driving circuit to start working, so that the second driving circuit provides a third driving voltage for the three-phase winding in the second delta connection state;
controlling the first switch group, the second switch group and the third switch group to be disconnected so as to switch the three-phase winding to be connected with an open winding; and controlling the first driving circuit to start working, and controlling the second driving circuit to start working, so that the first driving circuit provides a second driving voltage for the three-phase winding in the open winding connection state, and the second driving circuit provides a third driving voltage for the three-phase winding in the open winding connection state.
19. The drive control method according to claim 17, characterized by further comprising:
and controlling the second driving circuit to provide a fourth driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding.
20. The drive control method according to claim 19, wherein the switching of the three-phase winding to the open-winding connection, the controlling of the second drive circuit to supply a fourth drive voltage to the three-phase winding during the switching of the three-phase winding connection state, comprises:
the three-phase winding keeps the triangular connection and controls the second driving circuit to output three-phase voltage of the three-phase winding in the triangular connection state;
the first switch group is controlled to be switched off, and the second driving circuit outputs three-phase voltage of the three-phase winding in the triangular connection state for a first time threshold value;
and controlling the first driving circuit to output a second driving voltage, and controlling the second driving circuit to output a third driving voltage.
21. The drive control method according to claim 19, wherein the switching of the three-phase winding to the delta connection, the controlling of the second drive circuit to supply a fourth drive voltage to the three-phase winding during the switching of the three-phase winding connection state, comprises:
the three-phase winding keeps the open winding connection and controls the second driving circuit to output three-phase voltage of the three-phase winding in the triangular connection state;
controlling the first switch group to be closed, and outputting three-phase voltage of the three-phase winding in the triangular connection state by the second driving circuit for a first time threshold value;
and controlling the first driving circuit to output a first driving voltage and controlling the second driving circuit to stop working.
22. The drive control method according to any one of claims 17 to 21, wherein the controlling of the opening and closing of the switching assembly to switch the connection state of the three-phase winding includes at least one of:
controlling the switching of the switching assembly to switch the three-phase winding to the delta connection according to the operating frequency of the motor being lower than a first frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the fact that the working frequency of the motor is higher than a second frequency threshold;
wherein the first frequency threshold is less than or equal to the second frequency threshold.
23. The drive control method according to claim 17, wherein the switch assembly further includes a second switch group connected to the first three-phase outgoing line group and a third switch group connected to the second three-phase outgoing line group; the second switch group is closed, the first switch group and the third switch group are all opened, and the three-phase winding is switched to be in first star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in first triangular connection; the third switch group is closed, the first switch group and the second switch group are all opened, and the three-phase winding is switched to a second star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the second driving circuit provides third driving voltage for the three-phase winding, and the three-phase winding is switched to be in second triangular connection; the first switch group, the second switch group and the third switch group are all disconnected, the three-phase winding is switched to be connected with an open winding, and the control of the opening and the closing of the switch assembly to enable the three-phase winding to be switched to be connected comprises at least one of the following steps:
controlling the switching of the switching assembly to switch the three-phase winding to the first star connection according to the operating frequency of the motor being lower than a third frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the first triangular connection according to the fact that the working frequency of the motor is higher than the third frequency threshold and lower than a fourth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second star connection according to the operating frequency of the motor being higher than the fourth frequency threshold and lower than a fifth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second delta connection according to the fact that the working frequency of the motor is higher than the fifth frequency threshold and lower than a sixth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the operating frequency of the motor being higher than the sixth frequency threshold;
wherein the third frequency threshold, the fourth frequency threshold, the fifth frequency threshold, and the sixth frequency threshold increase sequentially.
24. The drive control method according to claim 17, wherein the switch assembly further includes a second switch group connected to the first three-phase outgoing line group and a third switch group connected to the second three-phase outgoing line group; the second switch group is closed, the first switch group and the third switch group are all opened, and the three-phase winding is switched to be in first star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the first driving circuit provides a first driving voltage for the three-phase winding, and the three-phase winding is switched to be in first triangular connection; the third switch group is closed, the first switch group and the second switch group are all opened, and the three-phase winding is switched to a second star connection; the first switch group is closed, the second switch group and the third switch group are all opened, the second driving circuit provides third driving voltage for the three-phase winding, and the three-phase winding is switched to be in second triangular connection; the first switch group, the second switch group and the third switch group are all disconnected, the three-phase winding is switched to be connected with an open winding, and the control of the opening and the closing of the switch assembly to enable the three-phase winding to be switched to be connected comprises at least one of the following steps:
controlling the switching of the switching assembly to switch the three-phase winding to the first star connection according to the operating frequency of the motor being below a seventh frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the first delta connection according to the fact that the working frequency of the motor is higher than an eighth frequency threshold and lower than a ninth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second star connection according to the operating frequency of the motor being higher than a tenth frequency threshold and lower than an eleventh frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the second delta connection according to the operating frequency of the motor being higher than a twelfth frequency threshold and lower than a thirteenth frequency threshold;
controlling the switching of the switching assembly to switch the three-phase winding to the open winding connection according to the fact that the working frequency of the motor is higher than a fourteenth frequency threshold;
wherein the seventh frequency threshold, the eighth frequency threshold, the ninth frequency threshold, the tenth frequency threshold, the eleventh frequency threshold, the twelfth frequency threshold, the thirteenth frequency threshold and the fourteenth frequency threshold increase sequentially.
25. A circuit board, characterized by: comprising a drive control circuit according to any of claims 1 to 16.
26. An air conditioner, characterized in that:
comprising the wiring board of claim 25;
alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a drive control method according to any one of claims 17 to 24.
27. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the drive control method according to any one of claims 17 to 24.
CN202010301094.1A 2020-04-16 2020-04-16 Drive control circuit, drive control method, circuit board and air conditioner Active CN111355421B (en)

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