CN111478642B - 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
CN111478642B
CN111478642B CN202010301996.5A CN202010301996A CN111478642B CN 111478642 B CN111478642 B CN 111478642B CN 202010301996 A CN202010301996 A CN 202010301996A CN 111478642 B CN111478642 B CN 111478642B
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switch
phase
connection state
group
terminal
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CN111478642A (en
Inventor
胡斌
黄招彬
赵鸣
龙谭
曾贤杰
张杰楠
文先仕
徐锦清
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Guangzhou Hualing Refrigeration Equipment Co Ltd
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Guangzhou Hualing Refrigeration Equipment Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16Arrangements 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
    • H02P25/18Arrangements 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
    • H02P25/184Arrangements 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

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 switch assembly, a first inversion module and a switching transition assembly, the three-phase winding is switched between a star connection state and a triangle connection state, the states of a first switch group and a second switch group are required to be respectively switched, through the arrangement of the switching transition assembly, a second drive voltage for keeping the three-phase winding running is provided for the three-phase winding before the first switch group and the second switch group are switched, after the first switch group and the second switch group are switched, the working state of the three-phase winding cannot be changed, the motor can still keep stable running, the smooth switching is ensured, the phenomenon that the three-phase winding is subjected to voltage impact to generate pause or braking when the motor is switched is avoided, and the connection state of the motor is switched without stopping the machine.

Description

Drive control circuit, drive control method, circuit board and air conditioner
Technical Field
The invention relates to the technical field of motor driving, in particular to a driving control circuit, a driving control method, a circuit board and an air conditioner.
Background
The driving motor of the high-efficiency inverter compressor of the inverter air conditioner is generally a permanent magnet synchronous motor, and the motor winding generally adopts a star-shaped connection mode. In order to improve the efficiency of the motor, it is necessary to increase the back electromotive force coefficient of the motor as much as possible. But be limited by direct current bus voltage, improve the back electromotive force coefficient and can make the compressor appear voltage saturation under lower frequency when high frequency operation to get into weak magnetic control in advance, efficiency when having led to the high frequency descends, influences the operating stability even, is unfavorable for full frequency channel's efficiency promotion. In order to solve the problem of high-frequency operation of a motor with high back electromotive force coefficient, a triangular winding connection mode is provided. The voltage utilization being star-connected in this manner
Figure BDA0002454356560000011
The high-frequency efficiency of the motor can be effectively improved.
In order to ensure that the compressor can efficiently and stably operate in a full frequency band, a frequency converter design of star-shaped and triangular switching is adopted, and due to the mechanical delay characteristic of a relay switch, the compressor needs to be closed before the star-shaped triangular switching, and the compressor is restarted after the switching. This may cause the compressor to be turned off more times during the adjustment of the frequency, which affects the temperature stability of the air conditioner for cooling and heating.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and provides a driving control circuit, a driving control method, a circuit board, an air conditioner, and a computer storage medium, which can switch the connection state of a motor without stopping the machine.
A drive control circuit according to an embodiment of a first aspect of the present invention 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, the other end of each of the phases of the windings constituting a second three-phase outgoing line group, includes:
the switch assembly comprises a first switch group and a second 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 second switch group is connected with the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched into a triangular connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched into a star connection;
the first inversion module is connected with the first three-phase outgoing line group and used for outputting a first driving voltage to the three-phase winding;
the switching transition assembly comprises an energy storage component, a first switch and a second inversion module, wherein the energy storage component is connected with the input end of the second inversion module through the first switch, the output end of the second inversion module is connected with the second three-phase wire outlet group, the second inversion module is used for providing a second driving voltage for the three-phase winding in the switching process of the connection state of the three-phase winding, and the second driving voltage is used for keeping the three-phase winding in operation in the switching process of the connection state.
The drive control circuit according to the embodiment of the invention has at least the following beneficial effects: three-phase winding switches the state that needs switch first switch group and second switch group respectively between star type connection status and triangle-shaped connection status, through setting up switching transition subassembly, it keeps moving second driving voltage to make three-phase winding to provide to three-phase winding before first switch group and second switch group switch, make first switch group and second switch group switch the back, three-phase winding's operating condition can not change, the motor still can maintain steady operation, it is smooth and easy to guarantee to switch, it receives voltage shock and produces pause and frustrate or the braking to avoid the motor to receive when switching, realize not shutting down the connection status who switches the motor.
According to some embodiments of the present invention, the second driving voltage is a three-phase voltage in which the three-phase windings are in a delta connection state or a neutral-point voltage in which the three-phase windings are in a star connection state. If the three-phase winding is in the triangular connection state before the switching of the switching assembly, the second inversion module provides three-phase voltage of the three-phase winding in the triangular connection state, so that the motor can still maintain stable operation after the switching of the switching assembly, and smooth switching is ensured; if the switching assembly is switched, the three-phase winding is in a star connection state, the second inversion module provides neutral point voltage of the three-phase winding in the star connection state, and after the switching assembly is switched, the motor can still maintain stable operation, and smooth switching is guaranteed.
According to some embodiments of the invention, the first switch group comprises a second switch, a third switch and a fourth switch, the first three-phase outgoing line group comprises a first terminal, a second terminal and a third terminal, the second three-phase outgoing line group comprises a fourth terminal, a fifth terminal and a sixth terminal, the second switch is respectively connected with the first terminal and the fifth terminal, the third switch is respectively connected with the second terminal and the sixth terminal, and the fourth switch is respectively connected with the third terminal and the fourth terminal. It will be appreciated that the first switch set is closed, i.e. the second switch is closed, the third switch is closed and the fourth switch is closed, thereby shorting the first and fifth terminals, the second and sixth terminals and the third and fourth terminals of the three-phase winding such that the three-phase winding is in a delta connection state. Similarly, the first switch group is turned off, that is, the second switch is turned off, the third switch is turned off, and the fourth switch is turned off. Wherein the first switch is one of an electromagnetic relay, a solid state relay, a contactor or an electronic switch; the second switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the third switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the fourth switch is one of an electromagnetic relay, a solid state relay, a contactor or an electronic switch. The electromagnetic relay, the solid-state relay, the contactor or the electronic switch can realize the functions of the first switch, the second switch, the third switch and the fourth switch, and can be used as the model selection of the first switch, the second switch, the third switch and the fourth switch.
According to some embodiments of the invention, the second switch group comprises a fifth switch and a sixth switch, the second three-phase outgoing line group comprises a fourth terminal, a fifth terminal and a sixth terminal, the fifth switch is respectively connected with the fourth terminal and the fifth terminal, and the sixth switch is respectively connected with the fifth terminal and the sixth terminal. It will be appreciated that the second switch set is closed, i.e. the fifth switch is closed and the sixth switch is closed, thereby shorting the fourth, fifth and sixth ends of the three-phase windings together so that the three-phase windings are in a star connected state. Similarly, the second switch group is turned off, that is, the fifth switch is turned off and the sixth switch is turned off. Wherein the fifth switch is one of an electromagnetic relay, a solid state relay, a contactor or an electronic switch; the sixth switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch. The electromagnetic relay, the solid-state relay, the contactor or the electronic switch can realize the functions of the fifth switch and the sixth switch and can be used as the model selection of the fifth switch and the sixth switch.
According to some embodiments of the invention, the second switch group includes a seventh switch, an eighth switch and a ninth switch, the second three-phase outgoing line group includes a fourth terminal, a fifth terminal and a sixth terminal, one end of the seventh switch is connected to the fourth terminal, one end of the eighth switch is connected to the fifth terminal, one end of the ninth switch is connected to the sixth terminal, and the other end of the seventh switch, the other end of the eighth switch and the other end of the ninth switch are shorted. It is understood that the second switch group is closed, that is, the seventh switch is closed, the eighth switch is closed, and the ninth switch is closed, so that the fourth end, the fifth end, and the sixth end of the three-phase winding are shorted together, so that the three-phase winding is in the star connection state. Similarly, the second switch group is turned off, that is, the seventh switch is turned off, the eighth switch is turned off, and the ninth switch is turned off. Wherein the seventh switch is one of an electromagnetic relay, a solid state relay, a contactor or an electronic switch; the eighth switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the ninth switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch. The electromagnetic relay, the solid-state relay, the contactor or the electronic switch can realize the functions of the seventh switch, the eighth switch and the ninth switch, and can be used as the model selection of the seventh switch, the eighth switch and the ninth switch.
According to some embodiments of the invention, the energy storage component is a first capacitor. When the first switch is closed and the second inversion module works in a rectification state, the first capacitor can be charged, and energy storage is realized; when the second inversion module works in an inversion state, the first capacitor supplies power to the second inversion module so that the second inversion module can output driving voltage to the three-phase winding.
According to some embodiments of the present invention, the power supply further comprises a dc power supply module, and an output terminal of the dc power supply module is connected to the first inverter module. The direct current power supply module is used for providing power supply voltage for the first inversion module.
According to some embodiments of the invention, a second capacitor is further connected between the dc power module and the first inverter module. The second capacitor may filter an alternating current component of the output voltage of the direct current power supply module.
According to some embodiments of the present invention, each of the first inverter module and the second inverter module includes a first bridge arm, a second bridge arm and a third bridge arm connected in parallel, each of the first bridge arm, the second bridge arm and the third bridge arm includes two switching tubes connected in series, and each of the switching tubes is connected in parallel and in reverse with a diode. The first bridge arm, the second bridge arm and the third bridge arm form a three-phase bridge structure, and the first inversion module and the second inversion module can respectively output a first driving voltage and a second driving voltage by controlling the on-off state of the switch tube.
According to some embodiments of the invention, the switching tube of the first inverter module is a metal oxide semiconductor MOS device, and the switching tube of the first inverter module is an insulated gate bipolar IGBT device. The first inversion module is used as a main driving device of the motor, a power switch tube of the first inversion module adopts a Metal Oxide Semiconductor (MOS) device, and compared with an Insulated Gate Bipolar Transistor (IGBT) device, the MOS device has the advantages of small current and lower conduction voltage drop when in light load, so that the first inversion module has high operation efficiency.
According to a second aspect of the present invention, there is provided a driving control method applied to a driving control circuit for driving an open-winding motor having three-phase windings, one end of each phase of the windings forming a first three-phase outgoing line group, and the other end of each phase of the windings forming a second three-phase outgoing line group, the driving control circuit including:
the switch assembly comprises a first switch group and a second 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 second switch group is connected with the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched into a triangular connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched into a star connection;
the first inversion module is connected with the first three-phase outgoing line group and used for outputting a first driving voltage to the three-phase winding;
the switching transition assembly comprises an energy storage component, a first switch and a second inversion module, the energy storage component is connected with the input end of the second inversion module through the first switch, and the output end of the second inversion module is connected with the second three-phase wire outlet group;
the method comprises the following steps:
controlling opening and closing of the switching assembly to switch the three-phase winding from a first connection state to a second connection state;
and controlling the switching transition assembly to provide a second driving voltage to the three-phase winding during switching, wherein the second driving voltage is used for keeping the three-phase winding running during switching of the connection state.
The control method of the driving circuit according to the embodiment of the invention has at least the following beneficial effects: the switching through the control switch subassembly realizes that three-phase winding's connection state switches, and control switching transition subassembly provides the second driving voltage that is used for making three-phase winding keep moving to three-phase winding at the switching in-process, make first switch group and second switch group switch the back, three-phase winding's operating condition can not change, the motor still can maintain steady operation, it is smooth and easy to guarantee to switch, avoid the motor three-phase winding to receive voltage impact and produce and pause and contort or brake when switching, realize the connection state of switching motor not shutting down.
According to some embodiments of the invention:
the first connection state is a star connection state, and the second connection state is a triangular connection state;
the controlling of the opening and closing of the switch assembly includes:
controlling the second switch group to be switched off;
controlling the first switch group to be closed;
the controlling the switching transition component to provide the second driving voltage to the three-phase winding during the switching process includes:
controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch set is disconnected;
and controlling the second inversion module to provide three-phase voltages in a delta connection state to the three-phase winding before the first switch group is closed.
In the technical scheme, the three-phase winding is switched from the star connection state to the triangle connection state, the second inverter module is controlled to provide neutral point voltage in the star connection state for the three-phase winding, namely the connection state of the second three-phase outgoing line group is simulated, and then the second switch group is controlled to be disconnected, so that the three-phase winding can still keep the star connection state to operate after the second switch group is disconnected; and then the second inversion module is controlled to provide three-phase voltage in a triangular connection state for the three-phase winding, and then the first switch group is controlled to be closed, so that after the first switch group is closed, the three-phase winding can still maintain stable operation, smooth switching is ensured, the phenomenon that the three-phase winding is subjected to voltage impact to generate pause or braking when the motor is switched is avoided, and the connection state of the motor is switched without stopping.
According to some embodiments of the invention:
the first connection state is a triangular connection state, and the second connection state is a star connection state;
the controlling of the opening and closing of the switch assembly includes:
controlling the first switch group to be switched off;
controlling the second switch group to be closed;
the controlling the switching transition component to provide the second driving voltage to the three-phase winding during the switching process includes:
controlling the second inversion module to provide three-phase voltages in a delta connection state to the three-phase winding before the first switch group is disconnected;
and controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch group is closed.
In the technical scheme, the three-phase winding is switched to the star connection state from the triangular connection state, the second inverter module is controlled to provide three-phase voltage in the triangular connection state for the three-phase winding, and then the first switch group is controlled to be disconnected; after the first switch group is disconnected, the three-phase winding can still keep the operation in a triangular connection state; and then the second inversion module is controlled to provide neutral point voltage in a star connection state for the three-phase winding, namely, the connection state of the second three-phase outgoing line group is simulated, and then the second switch group is controlled to be closed, so that the three-phase winding can still maintain stable operation after the second switch group is closed, smooth switching is ensured, the three-phase winding is prevented from being subjected to voltage impact during switching of the motor to generate pause or braking, and the connection state of the motor is switched without stopping.
According to some embodiments of the present invention, before controlling the second inverting module to provide the three-phase voltage in the delta connection state to the three-phase winding, the method further includes controlling the second inverting module to charge the energy storage component. And controlling the second inversion module to charge the energy storage component so that the energy storage component has enough electric energy to supply to the second inversion module in the subsequent steps, and ensuring that the second inversion module can output three-phase voltage of the three-phase winding in a triangular connection state.
According to some embodiments of the invention, before controlling the second inverter module to charge the energy storage component, the controlling further includes controlling the first switch to be closed. And controlling the first switch to be closed so as to connect the energy storage component with the second inversion module.
According to some embodiments of the present invention, the method further comprises controlling the first switch to be turned off and the second inverter module to stop working after the switching is completed. After the switching is completed, the three-phase winding is driven to operate by the first driving voltage provided by the first inversion module, the first switch is controlled to be switched off, the second inversion module is controlled to stop working, and the loss of the three-phase winding during operation can be reduced.
According to a third aspect of the present invention, there is provided a wiring board including the driving control circuit according to the first aspect of the present invention.
The circuit board provided by the embodiment of the invention at least has the following beneficial effects: three-phase winding switches the state that needs switch first switch group and second switch group respectively between star type connection status and triangle-shaped connection status, through setting up switching transition subassembly, it keeps moving second driving voltage to make three-phase winding to provide to three-phase winding before first switch group and second switch group switch, make first switch group and second switch group switch the back, three-phase winding's operating condition can not change, the motor still can maintain steady operation, it is smooth and easy to guarantee to switch, it receives voltage shock and produces pause and frustrate or the braking to avoid the motor to receive when switching, realize not shutting down the connection status who switches the motor.
According to a fourth aspect of the present invention, there is provided an air conditioner comprising the wiring board according to the third aspect of the present invention; alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the drive control method according to the embodiment of the third aspect of the present invention.
The air conditioner provided by the embodiment of the invention has at least the following beneficial effects: three-phase winding switches between star type connection status and triangle-shaped connection status and needs to switch the state of first switch group and second switch group respectively, through setting up switching transition subassembly, it keeps moving second driving voltage to make three-phase winding keep to provide to three-phase winding before first switch group and second switch group switch, make first switch group and second switch group switch the back, three-phase winding's operating condition can not change, the motor still can maintain steady operation, it is smooth and easy to guarantee to switch, it receives voltage shock and produces pause and contort or brake to avoid the motor when switching, realize not shutting down and switch the connection status of motor
A computer storage medium according to an embodiment of the fifth aspect of the present invention stores computer-executable instructions for causing a computer to perform the drive control method according to the embodiment of the third aspect of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
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 a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a driving control circuit according to a third embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a first inverter module and a second inverter module of a driving control circuit according to an embodiment of the present invention;
FIG. 5 is a flowchart of a driving control method according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a switching process of a driving control method according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another switching process of a driving control method according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
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 driving motor of the high-efficiency inverter compressor of the inverter air conditioner is generally a permanent magnet synchronous motor, and the motor winding generally adopts a star-shaped connection mode. In order to improve the efficiency of the motor, it is necessary to increase the back electromotive force coefficient of the motor as much as possible. But be limited by direct current bus voltage, improve the back electromotive force coefficient and can make the compressor appear voltage saturation under lower frequency when high frequency operation to get into weak magnetic control in advance, efficiency when having led to the high frequency descends, influences the operating stability even, is unfavorable for full frequency channel's efficiency promotion. In order to solve the problem of high-frequency operation of a motor with high back electromotive force coefficient, a triangular winding connection mode is provided. The voltage utilization being star-connected in this manner
Figure BDA0002454356560000101
The high-frequency efficiency of the motor can be effectively improved.
In order to ensure that the compressor can efficiently and stably operate in a full frequency band, a frequency converter design of star-shaped and triangular switching is adopted, and due to the mechanical delay characteristic of a relay switch, the compressor needs to be closed before the star-shaped triangular switching, and the compressor is restarted after the switching. This may cause the compressor to be turned off more times during the adjustment of the frequency, which affects the temperature stability of the air conditioner for cooling and heating.
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 computer storage medium, which can realize switching of the connection state of a motor without stopping.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, a first embodiment of the present invention provides a driving control circuit for driving an open-winding motor having three-phase windings, one end of each phase winding forms a first three-phase outgoing line group 100, and the other end of each phase winding forms a second three-phase outgoing line group 200, specifically, the three-phase windings include an a-phase winding, a B-phase winding, and a C-phase winding, where the first three-phase outgoing line group 100 includes a first end 110, a second end 220, and a third end 130, the first end 110 is one end of the a-phase winding, the second end 120 is one end of the B-phase winding, and the third end 130 is one end of the C-phase winding; accordingly, the second three-phase wire outlet group 200 includes a fourth terminal 210, a fifth terminal 220 and a sixth terminal 230, the fourth terminal 210 is the other end of the a-phase winding, the fifth terminal 220 is the other end of the B-phase winding, the sixth terminal 230 is the other end of the C-phase winding, and the driving control circuit includes:
the switch assembly comprises a first switch group KD and a second switch group KY, the first switch group KD is respectively connected with the first three-phase outgoing line group 100 and the second three-phase outgoing line group 200, the second switch group KY is connected with the second three-phase outgoing line group 200, the first switch group KD is closed, the second switch group KY is disconnected, the three-phase windings are switched into a triangular connection, the first switch group KD is disconnected, the second switch group KY is closed, and the three-phase windings are switched into a star connection;
the first inversion module is connected with the first three-phase outgoing line group 100 and is used for outputting a first driving voltage to the three-phase winding;
the switching transition assembly comprises an energy storage component, a first switch KB and a second inversion module, wherein the energy storage component is connected with the input end of the second inversion module through the first switch KB, the output end of the second inversion module is connected with a second three-phase wire outlet group 200, the second inversion module is used for providing second driving voltage for the three-phase winding in the switching process of the connection state of the three-phase winding, and the second driving voltage is used for keeping the three-phase winding in operation in the switching process of the connection state.
In the drive control circuit of this embodiment, three-phase winding switches the state that needs to switch first switch group KD and second switch group KY respectively between star type connection state and triangle-shaped connection state, through setting up switching transition subassembly, switch at first switch group KD and second switch group KY and provide the second driving voltage that makes three-phase winding keep the operation to three-phase winding, make first switch group KD and second switch group KY switch the back, three-phase winding's operating condition can not change, the motor still can maintain steady operation, it is smooth and easy to guarantee to switch, it receives voltage shock and produces pause or braking to avoid the motor to receive the three-phase winding when switching, realize the connection state of switching motor not shutting down.
Specifically, the second driving voltage is a three-phase voltage in which the three-phase winding is in a delta connection state or a neutral-point voltage in which the three-phase winding is in a star connection state. If the three-phase winding is in the triangular connection state before the switching of the switching assembly, the second inversion module provides three-phase voltage of the three-phase winding in the triangular connection state, so that the motor can still maintain stable operation after the switching of the switching assembly, and smooth switching is ensured; if the switching assembly is switched, the three-phase winding is in a star connection state, the second inversion module provides neutral point voltage of the three-phase winding in the star connection state, and after the switching assembly is switched, the motor can still maintain stable operation, and smooth switching is guaranteed.
Referring to fig. 1, in some embodiments of the present invention, the first switch group KD includes a second switch, a third switch and a fourth switch, the second switch is respectively connected to the first terminal 110 and the fifth terminal 220, the third switch is respectively connected to the second terminal 120 and the sixth terminal 230, and the fourth switch is respectively connected to the third terminal 130 and the fourth terminal 210. It will be appreciated that the first switch set KD is closed, i.e. the second switch is closed, the third switch is closed and the fourth switch is closed, thereby shorting the first terminal 110 and the fifth terminal 220 of the three-phase winding, shorting the second terminal 120 and the sixth terminal 230 and shorting the third terminal 130 and the fourth terminal 210, so that the three-phase winding is in a delta connection state. Similarly, the first switch set KD is turned off, that is, the second switch is turned off, the third switch is turned off, and the fourth switch is turned off. The first switch KB is one of an electromagnetic relay, a solid-state relay, a contactor, or an electronic switch; the second switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the third switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the fourth switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch. The electromagnetic relay, the solid-state relay, the contactor, or the electronic switch may implement functions of the first switch KB, the second switch, the third switch, and the fourth switch, and may be used as a selection type of the first switch KB, the second switch, the third switch, and the fourth switch.
It will be appreciated that the second, third and fourth switches may be three interlocked acting switches to achieve simultaneous action; or the interlocking is not needed, and only the control signals need to be synchronized. If the second switch, the third switch and the fourth switch adopt three switches with interlocking action, the interlocking mode can be mechanical interlocking or electronic interlocking.
Referring to fig. 1, in some embodiments of the present invention, the second switch group KY includes a fifth switch and a sixth switch, the fifth switch is respectively connected to the fourth terminal 210 and the fifth terminal 220, and the sixth switch is respectively connected to the fifth terminal 220 and the sixth terminal 230. It will be appreciated that the second switch group KY is closed, i.e. the fifth switch is closed and the sixth switch is closed, thereby shorting the fourth 210, fifth 220 and sixth 230 ends of the three-phase windings together so that the three-phase windings are in a star connected state. Similarly, the second switch group KY is turned off, that is, the fifth switch and the sixth switch are turned off. The fifth switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the sixth switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch. The electromagnetic relay, the solid-state relay, the contactor or the electronic switch can realize the functions of the fifth switch and the sixth switch and can be used as the model selection of the fifth switch and the sixth switch. Similarly, the fifth switch and the sixth switch may be two switches that act in an interlocking manner to achieve simultaneous action; or the interlocking is not needed, and only the control signals need to be synchronized. If the fifth switch and the sixth switch adopt two switches which are interlocked, the interlocking mode can be mechanical interlocking or electronic interlocking.
It is understood that the second switch group KY can be implemented in the manner as shown in fig. 2, besides the fifth switch and the sixth switch in fig. 1, that is: the second switch group KY includes a seventh switch, an eighth switch and a ninth switch, one end of the seventh switch is connected to the fourth terminal 210, one end of the eighth switch is connected to the fifth terminal 220, one end of the ninth switch is connected to the sixth terminal 230, and the other end of the seventh switch, the other end of the eighth switch and the other end of the ninth switch are short-circuited. It is understood that the second switch group KY is closed, that is, the seventh switch, the eighth switch and the ninth switch are closed, so as to short-circuit the fourth, fifth and sixth terminals 210, 220 and 230 of the three-phase winding together, so that the three-phase winding is in the star connection state. Similarly, the second switch group KY is turned off, that is, the seventh switch, the eighth switch and the ninth switch are turned off. Wherein, the seventh switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the eighth switch is one of an electromagnetic relay, a solid-state relay, a contactor or an electronic switch; the ninth switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch. The electromagnetic relay, the solid-state relay, the contactor or the electronic switch can realize the functions of the seventh switch, the eighth switch and the ninth switch, and can be used as the model selection of the seventh switch, the eighth switch and the ninth switch. Similarly, the seventh switch, the eighth switch and the ninth switch may be three switches acting in an interlocking manner to achieve simultaneous actions; or the interlocking is not needed, and only the control signals need to be synchronized. If the seventh switch, the eighth switch, and the ninth switch use three switches that are interlocked, the interlock mode may be a mechanical interlock or an electronic interlock.
Referring to fig. 1, in some embodiments of the present invention, the energy storage component is a first capacitor C1. When the first switch KB is closed and the second inverter module works in a rectification state, the first capacitor C1 can be charged to realize energy storage; when the second inversion module works in an inversion state, the first capacitor C1 supplies power to the second inversion module, so that the second inversion module can output driving voltage to the three-phase winding.
In some embodiments of the present invention, the dc power module 300 is further included, and an output terminal of the dc power module 300 is connected to the first inverter module. The dc power module 300 is used for providing a supply voltage for the first inverter module. The DC power module 300 may be the DC battery in fig. 1, or may be composed of the AC power supply and the AC/DC power module in fig. 3.
Referring to fig. 1, in some embodiments of the present invention, a second capacitor C2 is further connected between the dc power module and the first inverter module. The second capacitor C2 may filter out the ac component of the output voltage of the dc power supply module 300.
Referring to fig. 4, in some embodiments of the present invention, each of the first inverter module and the second inverter module includes a first leg 400, a second leg 500, and a third leg 600 connected in parallel, each of the first leg 400, the second leg 500, and the third leg 600 includes two switching tubes connected in series, and each of the switching tubes has a diode connected in anti-parallel. The first bridge arm 400, the second bridge arm 500 and the third bridge arm 600 form a three-phase bridge structure, and the first inverter module and the second inverter module can respectively output a first driving voltage and a second driving voltage by controlling the on-off state of the switching tubes. Specifically, first leg 400, second leg 500, and third leg 600 each include an upper switching tube and a lower switching tube.
In some embodiments of the present invention, the switching tube of the first inverter module uses a metal oxide semiconductor MOS device, and the switching tube of the first inverter module uses an insulated gate bipolar IGBT device. The first inversion module is used as a main driving device of the motor, a power switch tube of the first inversion module adopts a Metal Oxide Semiconductor (MOS) device, and compared with an Insulated Gate Bipolar Transistor (IGBT) device, the MOS device has the advantages of small current and lower conduction voltage drop when in light load, so that the first inversion module has high operation efficiency.
Referring to fig. 5, the driving control method provided in the second embodiment of the present invention is applied to the driving control circuit described in the first embodiment of the present invention, and includes, but is not limited to, the following steps:
step S100: controlling the switching of the switching assembly to switch the three-phase winding from the first connection state to the second connection state;
step S200: and controlling the switching transition component to provide a second driving voltage to the three-phase winding during the switching process, wherein the second driving voltage is used for keeping the three-phase winding in operation during the switching process of the connection state.
According to the control method of the driving circuit, the switching of the connection state of the three-phase winding is realized by controlling the switching of the switch assembly, and the switching transition assembly is controlled to provide the second driving voltage for keeping the three-phase winding running for the three-phase winding in the switching process, so that after the first switch group KD and the second switch group KY are switched, the working state of the three-phase winding cannot be changed, the motor can still keep stable running, the smooth switching is ensured, the phenomenon that the three-phase winding is subjected to voltage impact to generate pause or braking when the motor is switched is avoided, and the connection state of the motor is switched without stopping the motor.
Wherein, the condition that three-phase winding switches connection status includes: the first connection state is a star connection state, and the second connection state is a triangle connection state; in this case, the step S100 of controlling the opening and closing of the switch assembly includes:
controlling the second switch group KY to be switched off;
controlling the first switch group KD to be closed;
in the step S200, controlling the switching transition module to provide the second driving voltage to the three-phase winding during the switching process includes:
the second inversion module is controlled to provide neutral point voltage in a star connection state to the three-phase winding before the second switch group KY is disconnected;
and controlling the second inversion module to provide three-phase voltage in a delta connection state to the three-phase winding before the first switch group KD is closed.
In the above technical scheme, the three-phase winding is switched from the star connection state to the delta connection state, the second inverter module is controlled to provide the neutral point voltage in the star connection state to the three-phase winding, that is, the connection state of the second three-phase outgoing line group 200 is simulated, and then the second switch group KY is controlled to be disconnected, so that the three-phase winding can still keep the operation in the star connection state after the second switch group KY is disconnected; and then the second inversion module is controlled to provide three-phase voltage in a triangular connection state for the three-phase winding, and then the first switch group KD is controlled to be closed, so that after the first switch group KD is closed, the three-phase winding can still maintain stable operation, smooth switching is ensured, the phenomenon that the three-phase winding is subjected to voltage impact to generate pause or brake when the motor is switched is avoided, and the connection state of the motor is switched without stopping.
It is understood that the case where the three-phase winding switches the connection state further includes: the first connection state is a triangular connection state, and the second connection state is a star connection state; in this case, the step S100 of controlling the opening and closing of the switch assembly includes:
controlling the first switch group KD to be switched off;
controlling the second switch group KY to be closed;
in the step S200, controlling the switching transition module to provide the second driving voltage to the three-phase winding during the switching process includes:
controlling a second inversion module to provide three-phase voltage in a triangular connection state to the three-phase winding before the first switch group KD is disconnected;
and controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch group KY is closed.
In the technical scheme, the three-phase winding is switched to the star connection state from the triangular connection state, the second inverter module is controlled to provide three-phase voltage in the triangular connection state for the three-phase winding, and then the first switch set KD is controlled to be disconnected; after the first switch group KD is disconnected, the three-phase winding can still keep the operation in a triangular connection state; and then the second inversion module is controlled to provide neutral point voltage under a star-shaped connection state for the three-phase winding, namely, the connection state of the second three-phase outgoing line group 200 is simulated, and then the second switch group KY is controlled to be closed, so that after the second switch group KY is closed, the three-phase winding can still maintain stable operation, smooth switching is ensured, the three-phase winding is prevented from being subjected to voltage impact to generate pause or braking when the motor is switched, and the connection state of the motor is switched without stopping.
In some embodiments of the present invention, before controlling the second inverting module to provide the three-phase voltage in the delta connection state to the three-phase winding, the controlling of the second inverting module to charge the energy storage component is further included. And controlling the second inversion module to charge the energy storage component so that the energy storage component has enough electric energy to supply to the second inversion module in the subsequent steps, and ensuring that the second inversion module can output three-phase voltage of the three-phase winding in a triangular connection state.
In some embodiments of the present invention, before controlling the second inverting module to charge the energy storage component, the controlling of the first switch KB is further included. The first switch KB is controlled to be closed to connect the energy storage component and the second inversion module.
In some embodiments of the present invention, the method further includes controlling the first switch KB to be turned off and the second inverter module to stop operating after the switching is completed. After the switching is completed, the first inversion module provides the first driving voltage to drive the three-phase winding to operate, the first switch KB is controlled to be disconnected, the second inversion module is controlled to stop working, and the loss of the three-phase winding during operation can be reduced.
The following describes a drive control method of the drive control circuit with reference to a specific embodiment:
with reference to fig. 1 and 6, the motor needs to switch from the star connection state to the delta connection state, and specifically includes the following steps:
controlling the first switch KB to close; controlling upper switching tubes of a first bridge arm, a second bridge arm and a third bridge arm of the second inversion module to be conducted, and controlling lower switching tubes of the first bridge arm, the second bridge arm and the third bridge arm of the second inversion module to be cut off, so as to realize the connection state of the second three-phase outgoing line group 200 when the simulated three-phase winding is in a star connection state;
controlling the second switch group KY to be switched off;
controlling the second inversion module to work in a rectification state and charging the first capacitor C1;
controlling a first inversion module to provide three-phase voltage of a three-phase winding in a triangular connection state to the three-phase winding; the first capacitor C1 discharges electricity to the second inversion module, and the second inversion module is controlled to provide three-phase voltage of the three-phase winding in a triangular connection state to the three-phase winding;
controlling the first switch group KD to be closed;
controlling the first switch KB to be turned off; and controlling the second inversion module to stop working.
With reference to fig. 1 and 7, the motor needs to switch from the delta connection state to the star connection state, and specifically includes the following steps:
controlling the first switch KB to close;
controlling the second inversion module to work in a rectification state and charging the first capacitor C1;
the first capacitor C1 discharges electricity to the second inversion module, and the second inversion module is controlled to provide three-phase voltage of the three-phase winding in a triangular connection state to the three-phase winding; controlling the first switch group KD to be switched off;
controlling a first inversion module to provide three-phase voltage of a three-phase winding in a star connection state to the three-phase winding; controlling upper switching tubes of a first bridge arm, a second bridge arm and a third bridge arm of the second inversion module to be conducted, and controlling lower switching tubes of the first bridge arm, the second bridge arm and the third bridge arm of the second inversion module to be cut off, so as to realize the connection state of the second three-phase outgoing line group 200 when the simulated three-phase winding is in a star connection state; controlling the first switch KB to be turned off;
controlling the second switch group KY to be closed;
and controlling the second inversion module to stop working.
The embodiment of the third aspect of the present invention further provides a circuit board, including the driving control circuit according to the embodiment of the first aspect of the present invention. The function and principle of the circuit board of this embodiment are based on the above-mentioned driving control circuit, so the circuit board of this embodiment has the same function and principle as the above-mentioned driving control circuit, and for the sake of brevity, the description is not repeated here.
An embodiment of the fourth aspect of the present invention further provides an air conditioner, including the circuit board according to the embodiment of the third aspect of the present invention; alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the drive control method according to the embodiment of the third aspect of the present invention. The operation and principle of the air conditioner of this embodiment are based on the circuit board or the driving control method, and will not be repeated herein for saving space.
Embodiments of the fifth aspect of the present invention further provide a computer storage medium, where the computer storage medium stores computer-executable instructions for causing a computer to execute the drive control method according to embodiments of the third aspect of the present invention. The operation and principle of the computer storage medium of this embodiment are based on the above-described drive control method, and will not be repeated herein for the sake of brevity.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (16)

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 and a second 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 second switch group is connected with the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched into a triangular connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched into a star connection;
the first inversion module is connected with the first three-phase outgoing line group and used for outputting a first driving voltage to the three-phase winding;
the switching transition assembly comprises an energy storage component, a first switch and a second inversion module, the energy storage component is connected with the input end of the second inversion module through the first switch, the output end of the second inversion module is connected with the second three-phase wire outlet group, the second inversion module is used for providing a second driving voltage for the three-phase winding in the switching process of the connection state of the three-phase winding, and the second driving voltage is used for keeping the three-phase winding in operation in the switching process of the connection state;
wherein:
when the switching process of the three-phase winding is switched from a star connection state to a triangular connection state, the second switch group is controlled to be disconnected; controlling the first switch group to be closed; controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch set is disconnected; controlling the second inversion module to provide three-phase voltages in a delta connection state to the three-phase winding before the first switch group is closed;
and/or when the switching process of the three-phase winding is switched from a triangular connection state to a star connection state, controlling the first switch group to be disconnected; controlling the second switch group to be closed; controlling the second inversion module to provide three-phase voltages in a delta connection state to the three-phase winding before the first switch group is disconnected; and controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch group is closed.
2. The drive control circuit according to claim 1, wherein the first switch group includes a second switch, a third switch, and a fourth switch, the first three-phase outgoing line group includes a first terminal, a second terminal, and a third terminal, the second three-phase outgoing line group includes a fourth terminal, a fifth terminal, and a sixth terminal, the second switch is connected to the first terminal and the fifth terminal, respectively, the third switch is connected to the second terminal and the sixth terminal, respectively, and the fourth switch is connected to the third terminal and the fourth terminal, respectively.
3. The driving control circuit according to claim 1, wherein the second switch group comprises a fifth switch and a sixth switch, the second three-phase outgoing line group comprises a fourth terminal, a fifth terminal and a sixth terminal, the fifth switch is respectively connected to the fourth terminal and the fifth terminal, and the sixth switch is respectively connected to the fifth terminal and the sixth terminal.
4. The driving control circuit according to claim 1, wherein the second switch group includes a seventh switch, an eighth switch, and a ninth switch, the second three-phase outgoing line group includes a fourth terminal, a fifth terminal, and a sixth terminal, one terminal of the seventh switch is connected to the fourth terminal, one terminal of the eighth switch is connected to the fifth terminal, one terminal of the ninth switch is connected to the sixth terminal, and the other terminal of the seventh switch, the other terminal of the eighth switch, and the other terminal of the ninth switch are shorted.
5. The drive control circuit according to claim 1, wherein the energy storage component is a first capacitor.
6. The driving control circuit according to claim 1, further comprising a dc power module, wherein an output terminal of the dc power module is connected to the first inverter module.
7. The drive control circuit according to claim 6, wherein a second capacitor is further connected between the DC power supply module and the first inverter module.
8. The driving control circuit according to claim 1, wherein the first inverter module and the second inverter module each include a first bridge arm, a second bridge arm and a third bridge arm connected in parallel with each other, each of the first bridge arm, the second bridge arm and the third bridge arm includes two switching tubes connected in series with each other, and the switching tubes are connected in anti-parallel with diodes.
9. 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, 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 and a second 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 second switch group is connected with the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched into a triangular connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched into a star connection;
the first inversion module is connected with the first three-phase outgoing line group and used for outputting a first driving voltage to the three-phase winding;
the switching transition assembly comprises an energy storage component, a first switch and a second inversion module, the energy storage component is connected with the input end of the second inversion module through the first switch, and the output end of the second inversion module is connected with the second three-phase wire outlet group;
the method comprises the following steps:
controlling opening and closing of the switching assembly to switch the three-phase winding from a first connection state to a second connection state;
controlling the switching transition component to provide a second driving voltage to the three-phase winding during switching, wherein the second driving voltage is used for keeping the three-phase winding running during switching of the connection state;
when the first connection state is a star connection state, the second connection state is a triangle connection state;
the controlling of the opening and closing of the switch assembly includes:
controlling the second switch group to be switched off;
controlling the first switch group to be closed;
the controlling the switching transition component to provide the second driving voltage to the three-phase winding during the switching process includes:
controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch set is disconnected;
and controlling the second inversion module to provide three-phase voltages in a delta connection state to the three-phase winding before the first switch group is closed.
10. 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, 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 and a second 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 second switch group is connected with the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched into a triangular connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched into a star connection;
the first inversion module is connected with the first three-phase outgoing line group and used for outputting a first driving voltage to the three-phase winding;
the switching transition assembly comprises an energy storage component, a first switch and a second inversion module, the energy storage component is connected with the input end of the second inversion module through the first switch, and the output end of the second inversion module is connected with the second three-phase wire outlet group;
the method comprises the following steps:
controlling opening and closing of the switching assembly to switch the three-phase winding from a first connection state to a second connection state;
controlling the switching transition component to provide a second driving voltage to the three-phase winding during switching, wherein the second driving voltage is used for keeping the three-phase winding running during switching of the connection state;
when the first connection state is a triangular connection state, the second connection state is a star connection state;
the controlling of the opening and closing of the switch assembly includes:
controlling the first switch group to be switched off;
controlling the second switch group to be closed;
the controlling the switching transition component to provide the second driving voltage to the three-phase winding during the switching process includes:
controlling the second inversion module to provide three-phase voltages in a delta connection state to the three-phase winding before the first switch group is disconnected;
and controlling the second inversion module to provide neutral point voltage in a star connection state to the three-phase winding before the second switch group is closed.
11. The drive control method according to claim 9 or 10, further comprising controlling the second inverter module to charge the energy storage component before controlling the second inverter module to supply the three-phase voltages in the delta connection state to the three-phase windings.
12. The driving control method according to claim 11, further comprising controlling the first switch to be closed before controlling the second inverter module to charge the energy storage component.
13. The driving control method according to claim 9 or 10, further comprising controlling the first switch to be turned off and the second inverter module to stop operating after the switching is completed.
14. A wiring board characterized by comprising the drive control circuit according to any one of claims 1 to 8.
15. An air conditioner, characterized by comprising the wiring board of claim 14;
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 9 to 13.
16. A computer storage medium storing computer-executable instructions for causing a computer to execute the drive control method according to any one of claims 9 to 13.
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