CN111355415A

CN111355415A - Drive control circuit, drive control method, circuit board and air conditioner

Info

Publication number: CN111355415A
Application number: CN202010299692.XA
Authority: CN
Inventors: 黄招彬; 时崎久; 曾贤杰; 龙谭; 张杰楠; 赵鸣
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2020-06-30

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 and a second drive circuit, and the second drive circuit is arranged, so that when the connection mode of a three-phase winding is switched, the second drive circuit can provide a second drive 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 a first switch group and a second switch group in the switching process.

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 inverter compressor of the existing inverter air conditioner mostly adopts a permanent magnet motor as a driving motor, and is influenced by the operation requirement of the inverter air conditioner, a three-phase winding of the permanent magnet motor generally needs to be switched between star connection and delta connection, and generally, the purpose of switching the connection mode is realized by controlling a switch device. However, most of the existing switching devices are mechanical, the closing or opening action of the existing switching devices needs a certain time to complete, and when the existing scheme is used for switching 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.

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 the non-stop switching of the connection mode of a three-phase winding of a motor without influencing the normal operation of a compressor.

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 another end of each phase of the winding forms a second three-phase outgoing line group, where the drive control circuit includes:

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 windings;

the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, the first switch group is closed, the second switch group is opened, the three-phase windings are switched to be in star connection, the first switch group is opened, the second switch group is closed, and the three-phase windings are switched to be in triangular connection;

and the second driving circuit is connected with the first three-phase outgoing line group and used for providing a second driving voltage for the three-phase winding in the switching process of the star connection and the triangular connection of the three-phase winding and stopping working after the switching of the connection state of the three-phase winding is finished, and the second driving voltage is used for keeping the motor running in the switching process of the connection state of the three-phase winding.

The drive control circuit provided by the embodiment of the invention at least has the following beneficial effects: through setting up the switch module, can realize switching the connected mode of three-phase winding according to the operating frequency that the motor is different, promote the operating efficiency of motor to, through setting up second drive circuit, when switching the connected mode of three-phase winding, second drive circuit can be in three-phase winding connected state switching process does three-phase winding provides second drive voltage to the simulation is at the voltage environment that first switch group and second switch group located in the switching process, consequently, when switching the connected mode, even first switch group or second switch group change the switching state, the motor still normally operates, can realize the switching of not shutting down of motor three-phase winding connected mode, does not influence the normal operating of compressor.

In some embodiments of the present invention, the second driving voltage is a neutral point voltage of the three-phase winding in the star connection state or a three-phase voltage of the three-phase winding in the delta connection state.

In the above technical solution, the second driving voltage is a neutral point voltage of the three-phase winding in the star connection state, and can simulate a voltage environment when the three-phase winding is in the star connection state; the second driving voltage is a three-phase voltage of the three-phase winding in the delta connection state, and can simulate a voltage environment of the three-phase winding in delta connection.

In some embodiments of the present invention, the first switch group and the second switch group are both open, the three-phase winding is switched to an open winding connection, the second drive circuit is further configured to provide a third drive voltage to the three-phase winding during switching of the three-phase winding between the delta connection and the open winding connection and to provide a fourth drive voltage to the three-phase winding after switching of the three-phase winding connection state is completed, and the third drive voltage is used to keep the motor running during switching of the three-phase winding connection state.

In the above technical solution, the second driving circuit is further configured to provide a third driving voltage for the three-phase winding during the switching process of the connection state of the three-phase winding, and may simulate a voltage environment in which the second switch group is located during the switching process of the three-phase winding between the delta connection and the open winding connection, so that when the switching process is performed between the delta connection and the open winding connection, even if the second switch group changes the open-close state, the motor still operates normally, the non-stop switching of the connection mode of the three-phase winding of the motor may be implemented, and the normal operation of the compressor is not affected.

In some embodiments of the present invention, the third 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 third 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 and a second switch, the first three-phase outgoing line group includes a first pin, a second pin and a third pin, the first switch is respectively connected to the first pin and the second pin, and the second switch is respectively connected to the second pin and the third pin.

In the above technical scheme, the first switch group includes the first switch and the second switch, and when the first switch and the second switch are simultaneously closed and the second switch group is in the off state, the first pin, the second pin and the third pin are connected to each other at this time, so that the three-phase winding is in the star connection state.

In some embodiments of the invention, the first switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch, and the second switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch.

Among the above-mentioned technical scheme, electromagnetic relay, solid state relay, contactor or electronic switch have switch stably, advantage with low costs.

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

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

In some embodiments of the present invention, the second switch group includes a fourth switch, a fifth switch, and a sixth switch, the 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 fourth switch is respectively connected to the second pin and the sixth pin, the fifth switch is respectively connected to the third pin and the fifth pin, and the sixth switch is respectively connected to the first pin and the fourth pin.

Among the above-mentioned technical scheme, the second switch group includes fourth switch, fifth switch and sixth switch, and is closed simultaneously when fourth switch, fifth switch and sixth switch, and first switch group is in the off-state, second pin and sixth pin interconnect this moment, third pin and fifth pin interconnect, first pin and fourth pin interconnect for three-phase winding is the triangle-shaped connection.

In some embodiments of the present invention, the fourth switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch, the fifth switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch, and the sixth switch is one of an electromagnetic relay, a solid state relay, a contactor, or an electronic switch.

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 power switch tubes connected in series, and the power switch tubes are connected in anti-parallel with diodes.

In the technical scheme, the first bridge arm, the second bridge arm and the third bridge arm form a three-phase bridge structure, the first driving circuit can output sine wave alternating current signals for driving the motor to operate by controlling the on-off states of the six power switching tubes, and the second driving circuit can output neutral point voltage of the three-phase winding in a star connection state or three-phase voltage of the three-phase winding in a triangular connection state.

In some embodiments of the present invention, the power switch tube of the first driving circuit is a metal oxide semiconductor MOS device, and the power switch tube of the second driving circuit is an insulated gate bipolar IGBT device.

In the above technical scheme, the first driving circuit is used as a main driving device of the motor, and the power switching tube of the first driving circuit is an MOS device, an MOS device made of SiC material, or an MOS device made of GaN material. The second driving circuit is used for simulating the voltage environment of the first switch and the second switch in the switching process, and the power switch tube of the second driving circuit adopts an IGBT device, so that the second driving circuit has the advantage of low cost.

In some embodiments of the present invention, the power supply module is further included, and the power supply module is connected to the first driving circuit and the second driving circuit respectively, and the first driving circuit and the second driving circuit are arranged in a common ground and a common bus.

In the technical scheme, the power supply assembly is arranged, so that input voltage can be provided for the first drive circuit and the second drive circuit, the purpose of driving the motor to operate and simulating the voltage environment of the first switch group and the second switch group in the switching process is achieved, the first drive circuit and the second drive circuit are arranged in a common ground mode and a common bus, and the working stability can be improved.

In some embodiments of the present invention, the power supply module includes an ac power source and a rectifying module for converting the ac power source into a dc output, the ac power source is connected to the rectifying module, and the rectifying module is respectively connected to the first driving circuit and the second driving circuit.

In the technical scheme, the rectifier assembly is arranged, so that an alternating current power supply can be converted into direct current output to adapt to the input signal requirements of the first driving circuit and the second driving circuit.

In some embodiments of the invention, the power supply further comprises a filter component, and the filter component and the power supply component are connected in parallel.

In the technical scheme, the filter assembly is arranged, so that interference signals of the power supply assembly can be filtered, and the stability of the power supply assembly is improved.

In some embodiments of the invention, the filter assembly comprises an electrolytic capacitor.

In the technical scheme, the filtering component adopts the electrolytic capacitor, and has the advantages of simple structure and low cost.

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 first driving circuit is connected with the first three-phase outgoing line group;

the second driving circuit is connected with the second three-phase outgoing line group;

the drive control method includes:

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 second driving circuit to provide a second driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding.

The drive control method provided by the embodiment of the invention at least has the following beneficial effects: the switching of the switch assembly is controlled to enable the three-phase winding to be switched from the first connection state to the second connection state, the connection mode of switching the three-phase winding according to different working frequencies of the motor can be achieved, the running efficiency of the motor is improved, in the switching process, the second driving circuit is controlled to provide second driving voltage for the three-phase winding, and the voltage environment where the first switch group and the second switch group are located in the switching process is simulated.

In some embodiments of the present invention, the first connection state is star connection, the second connection state is delta connection, and the controlling the second driving circuit to supply the second driving voltage to the three-phase windings during switching of the connection states of the three-phase windings includes:

the three-phase winding maintains the star connection, and the second driving circuit is controlled to output neutral point voltage of the three-phase winding in the star connection state;

controlling the first switch group to be switched off, and outputting a neutral point voltage of the three-phase winding in the star connection state by the second driving circuit for a first time threshold value;

controlling the second driving circuit to output three-phase voltages of the three-phase winding in the triangular connection state;

controlling the second 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 second time threshold value;

and controlling the second driving circuit to stop working.

In the technical scheme, the second driving circuit is controlled to simulate the neutral point voltage of the three-phase winding in the star connection state, and the motor can still operate in the star connection state even if the first switch group is disconnected; and then the second driving circuit is controlled to simulate the three-phase voltage of the three-phase winding in the triangular connection state, namely, the motor can be operated in the triangular connection state in the process of closing the second switch group, so that the switching without stopping is realized.

In some embodiments of the present invention, the first connection state is a delta connection, the second connection state is a star connection, and the controlling the second driving circuit to supply the second driving voltage to the three-phase windings during switching of the connection states of the three-phase windings 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 second 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 second time threshold value;

controlling the second driving circuit to output a neutral point voltage of the three-phase winding in the star connection state;

controlling the first switch group to be closed, and outputting a neutral point voltage of the three-phase winding in the star connection state by the second driving circuit for a first time threshold value;

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, and the motor can still operate in the triangular connection state even if the second switch group is disconnected; and then the second driving circuit is controlled to simulate the neutral point voltage of the three-phase winding in the star connection state, namely, the motor can be operated in the star connection state in the process of closing the first switch group, so that the non-stop switching is realized.

In some embodiments of the present invention, the first switch group and the second switch group are both open, the three-phase winding is switched to an open winding connection, and the drive control method further includes:

and controlling the second driving circuit to provide a third 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 third driving voltage to the three-phase winding in the switching process of the connection state of the three-phase winding, so that the non-stop switching of the three-phase winding between the delta connection and the open winding connection can be realized.

In some embodiments of the present invention, the first connection state is a delta connection, the second connection state is an open winding connection, and the controlling the second driving circuit to supply the third driving voltage to the three-phase windings during switching of the three-phase winding connection state includes:

and controlling the second driving circuit to output a fourth 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 first connection state is an open winding connection, the second connection state is a delta connection, and the controlling the second driving circuit to supply the third driving voltage to the three-phase winding during switching of the three-phase winding connection state 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 a triangular connection state;

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 switch the three-phase winding from the first connection state to the second connection state includes at least one of:

controlling the switching of the switching assembly to switch the three-phase winding from a delta connection to a star connection in dependence on the operating frequency of the motor being below a first frequency threshold;

and controlling the opening and closing of the switch assembly to switch the three-phase winding from star connection or open winding connection to delta connection according to the condition that the working frequency of the motor is higher than a first frequency threshold and lower than a second frequency threshold.

Controlling the switching of the switching assembly to switch the three-phase winding from delta connection to open winding connection according to the operating frequency of the motor being higher than a second frequency threshold;

wherein the first frequency threshold is lower than 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.

controlling the switching of the switch assembly to switch the three-phase winding from a delta connection to a 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 from star connection or open winding connection to delta connection according to the fact that the working frequency of the motor is higher than a fourth frequency threshold and lower than a fifth frequency threshold;

controlling the switching of the switching assembly to switch the three-phase winding from delta connection to open winding connection according to the operating frequency of the motor being higher than a sixth frequency threshold;

wherein the third frequency threshold, the fourth frequency threshold, the fifth frequency threshold, and the sixth frequency threshold increase sequentially.

In the technical scheme, by sequentially increasing the third frequency threshold, the fourth frequency threshold, the fifth frequency threshold and the sixth frequency threshold, when the working frequency of the motor is judged, the third frequency threshold and the fourth frequency threshold can form a hysteresis interval, and the fifth frequency threshold and the sixth frequency threshold 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.

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 the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch assembly, the operation efficiency of the motor is improved, and the second drive circuit is arranged, when the connection mode of the three-phase winding is switched, the second drive circuit can provide second drive 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 where the first switch group and the second switch group are located in the switching process.

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

Alternatively, the first and second electrodes may be,

comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the drive control method of the second aspect.

Therefore, 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, the operation efficiency of the motor is improved, and the second drive circuit is arranged, when the connection mode of the three-phase winding is switched, the second drive circuit can provide second drive 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 where the first switch group and the second switch group are located in the switching process.

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 waveform diagram of signals of a driving control circuit for controlling the three-phase winding to switch from a star connection to a delta connection according to an embodiment of the present invention;

fig. 4 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. 5 is a schematic structural diagram of a first driving circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second driving circuit according to an embodiment of the present invention;

fig. 7 is a flowchart of a driving control method according to an embodiment of the present invention;

fig. 8 is a flowchart for controlling the second driving circuit to supply the second 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. 9 is a flowchart for controlling the second driving circuit to supply the second 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. 10 is a flowchart illustrating supplementary steps of a driving control method according to another embodiment of the present invention;

fig. 11 is a flowchart for controlling the second driving circuit to supply the third 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. 12 is a flowchart for controlling the second driving circuit to supply the third 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. 13 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. 14 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. 15 is a schematic diagram of a circuit board according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of an air conditioner according to an embodiment of the present invention;

fig. 17 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.

Based on this, the embodiment of the invention provides a drive control circuit, a drive control method, a circuit board, an air conditioner and a storage medium, which can realize the non-stop switching of the connection mode of the three-phase winding of the motor without influencing the normal operation of the compressor.

The embodiments of the present invention will be further explained with reference to the drawings.

Referring to fig. 1, an embodiment of the present invention provides a driving control circuit for driving an open-winding motor having three-phase windings 100, one end of each phase winding constituting a first three-phase outgoing line group 101, the other end of each phase winding constituting a second three-phase outgoing line group 102, the driving control circuit including a first driving circuit 110 for supplying a first driving voltage to the three-phase windings 100, a switching element 120, and a second driving circuit 130, the first driving circuit 110 being connected to the second three-phase outgoing line group 102; the switch assembly 120 includes a first switch group 121 and a second switch group 122, the first switch group 121 is connected to the first three-phase outgoing line group 101, the second switch group 122 is respectively connected to the first three-phase outgoing line group 101 and the second three-phase outgoing line group 102, the first switch group 121 is closed, the second switch group 122 is open, the three-phase winding 100 is switched to a star connection, the first switch group 121 is open, the second switch group 122 is closed, and the three-phase winding 100 is switched to a delta connection; the second driving circuit 130 is connected to the first three-phase outgoing line group 101, and is configured to provide a second driving voltage to the three-phase winding 100 during the switching of the connection states of the three-phase winding 100, and stop working after the switching of the connection states of the three-phase winding 100 is completed, where the second driving voltage is used to keep the motor running during the switching of the connection states of the three-phase winding 100, and in this embodiment, the motor running during the switching of the connection states of the three-phase winding 100 refers to a motor running with electricity rather than running with inertia.

In an embodiment, the first switch group 121 includes a first switch K1 and a second switch K2, 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, a first pin M1 and a sixth pin M6 are respectively led out from two ends of the first phase winding, a second pin M2 and a fifth pin M5 are respectively led out from two ends of the second phase winding, a third pin M3 and a fourth pin M4 are respectively led out from two ends of the third phase winding, based on this, the first three-phase outgoing line group 101 includes a first pin M1, a second pin M2 and a third pin M3, the first switch K1 is respectively connected with the first pin M1 and the second pin M2, and the second switch K2 is respectively connected with the second pin M2 and the third pin M3. The second switch group 122 includes a fourth switch K4, a fifth switch K5 and a sixth switch K6, 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 fourth switch K4 is respectively connected to the second pin M2 and the sixth pin M6, the fifth switch K5 is respectively connected to the third pin M3 and the fifth pin M5, and the sixth switch K6 is respectively connected to the first pin M1 and the fourth pin M4.

When the first switch K1 and the second switch K2 are simultaneously closed and the second switch group 122 is in an open state, the first pin M1, the second pin M2 and the third pin M3 are connected to each other, so that the three-phase winding 100 is in a star connection state. When the fourth switch K4, the fifth switch K5 and the sixth switch K6 are simultaneously turned on and the first switch group 121 is in an off state, the second pin M2 and the sixth pin M6 are connected to each other, the third pin M3 and the fifth pin M5 are connected to each other, and the first pin M1 and the fourth pin M4 are connected to each other, so that the three-phase winding 100 is connected in a delta shape. When the first switch K1, the second switch K2, the fourth switch K4, the fifth switch K5 and the sixth switch K6 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 individually powered, so that the three-phase winding 100 is in an open winding connection.

Referring to fig. 2, in an embodiment, the first switch group 121 may also include a first switch K1, a second switch K2, and a third switch K3, wherein one ends of the first switch K1, the second switch K2, and the third switch K3 are connected to each other, and the other ends of the first switch K1, the second switch K2, and the third switch K3 are respectively connected to the first pin M1, the second pin M2, and the third pin M3. When the first switch K1, the second switch K2 and the third switch K3 are simultaneously closed and the second switch group 122 is in the open state, the first pin M1, the second pin M2 and the third pin M3 are connected to each other, so that the three-phase winding 100 is also in the star connection state.

In an embodiment, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 may be 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 and the sixth switch K6 are all single-pole single-throw relays. It should be added that if the electronic switch is selected, its on-resistance does not exceed 1 ohm.

Referring to fig. 3, the embodiment of the present invention provides the second driving circuit 130, so that the three-phase winding 100 enters the transition state when switching from the star connection to the delta connection. When the three-phase winding 100 is in the star connection, the first driving circuit 110 provides the first driving voltage, the second driving circuit 130 is turned off, the first switch group 121 is closed, and the second switch group 122 is opened. Then, a transition state is entered, wherein in the transition state, in the phase I, the states of the first switch group 121 and the second switch group 122 are controlled to be unchanged, and the second drive circuit 130 outputs the star-connected neutral point voltage, and in this phase, the motor is still operated in the star-connected state; in the phase II, the first switch set 121 is controlled to be opened, the second switch set 122 is controlled to be in a constant state, and the second drive circuit 130 outputs the star-connected neutral point voltage for a first time threshold, in this phase, because the second drive circuit 130 outputs the star-connected neutral point voltage, the motor can still operate in the star-connected state even if the first switch set 121 is opened, and in addition, because a certain time period is required for the first switch set 121 to be opened from being closed, the first time threshold needs to be continued, and the first time threshold can be the action time period of the first switch set 121; in the stage III, the first switch group 121 completes the disconnection operation, controls the second switch group 122 to output the three-phase voltage in delta connection, and in this stage, because the first switch group 121 and the second switch group 122 do not operate, the second drive circuit 130 changes the neutral point voltage of the star connection into the three-phase voltage in delta connection, and in this stage, the motor is still in the normal power supply state, so that the motor can keep running; in the IV stage, the first switch group 121 is controlled to be in a constant state, the second switch group 122 is controlled to be closed, the second driving circuit 130 outputs the three-phase voltage in the delta connection, and the second time threshold continues, because the second driving circuit 130 outputs the three-phase voltage in the delta connection, in the process that the second switch group 122 is closed, 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 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 period 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 star connection to the 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 star connection to the delta connection, thereby achieving the non-stop switching.

The principle of switching the three-phase winding 100 from delta connection to star connection is similar to the process described above. 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, the first switch set 121 is opened, and the second switch set 122 is closed. Then, entering a transition state, wherein in the transition state, in the IV 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 three-phase voltages in delta connection, and in this stage, the motor is still in the delta connection state for operation; in the stage III, the first switch set 121 is controlled to be in a constant state, the second switch set 122 is controlled to be off, the second drive circuit 130 outputs the three-phase voltage in the delta connection, and the second time threshold continues, in this stage, because the second drive circuit 130 outputs the three-phase voltage in the delta connection, even if the second switch set 122 is off, the motor can still operate in the delta connection state, in addition, because a certain time duration is required for the second switch set 122 to be off from being on, the second time threshold needs to be continued, and the second time threshold can be the action time duration of the second switch set 122; in the phase II, the second switch group 122 completes the opening action, and controls the first switch group 121 to output the neutral point voltage of the star connection, and in this phase, because the first switch group 121 and the second switch group 122 do not act, the second drive circuit 130 changes the three-phase voltage of the output delta connection into the neutral point voltage of the output star connection, and in this phase, the motor is still in the normal power supply state, so the motor can keep running; in the phase I, the first switch set 121 is controlled to be closed, the state of the second switch set 122 is unchanged, the second drive circuit 130 outputs the star-connected neutral point voltage, and the first time threshold value is maintained, because the second drive circuit 130 outputs the star-connected neutral point voltage, in the process that the first switch set 121 is closed, the three-phase winding 100 is already equivalently in the star-connected 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 value needs to be maintained, and the first time threshold value may be the action time period of the first switch set 121. Finally, the first switch group 121 completes the closing action, controls the second driving circuit 130 to stop, and the three-phase winding 100 completes the switching from the delta connection to the 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 delta connection to the star connection, thereby achieving the non-stop switching.

It should be added that the second driving voltage is a neutral point voltage when the three-phase winding 100 is in a star connection state, or a three-phase voltage when the three-phase winding 100 is in a delta connection state, so that the transition of the three-phase winding 100 in the star connection and delta connection switching process is smoother and more stable. It will be appreciated by those skilled in the art that the second driving voltage may also be set to other voltage values during the switching process.

In an embodiment, the second driving circuit is further configured to provide a third driving voltage to the three-phase winding during switching of the connection state of the three-phase winding and provide a fourth driving voltage to the three-phase winding after switching of the connection state of the three-phase winding is completed, where the third driving voltage is a three-phase voltage of the three-phase winding in the delta connection state.

Referring to fig. 4, 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, the first switch set 121 is opened, and the second switch set 122 is closed. Then, entering a transition state, wherein in the transition state, in a V-th 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 three-phase voltages in a delta connection, and in this stage, the motor is still in a delta connection state for operation; in the VI stage, the first switch set 121 is controlled to be in a constant state, the second switch set 122 is controlled to be off, the second driving circuit 130 outputs the three-phase voltage in the delta connection, and the second time threshold continues, in this stage, because the second driving circuit 130 outputs the three-phase voltage in the delta connection, even if the second switch set 122 is off, the motor can still operate in the delta connection state, in addition, because a certain time duration is required for the second switch set 122 to be off from being on, the second time threshold needs to be continued, and the second time threshold can be the action time duration of the second switch set 122. Finally, the second switch group 122 completes the turn-off operation, the second driving circuit outputs the fourth driving voltage, and the three-phase winding 100 completes the switching 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 first driving voltage, the second driving circuit 130 provides the fourth driving voltage, the first switch group 121 is turned off, and the second switch group 122 is turned off. 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 three-phase voltages in delta connection, and in this stage, the motor is still in an open winding connection state to operate; in the phase V, the first switch set 121 is controlled to be in a constant state, the second switch set 122 is controlled to be closed, the second driving circuit 130 outputs the three-phase voltage in the delta connection, and the second time threshold continues, in this phase, because the second driving circuit 130 outputs the three-phase voltage in the delta connection, in the process that the second switch set 122 is closed, the three-phase winding 100 is in the delta connection state, that is, the motor can keep running, because 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 open winding connection to the 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 open winding connection to the delta connection, thereby realizing the non-stop switching.

It will be appreciated that after the three-phase winding 100 has switched from the wye connection to the delta connection, the second drive circuit 130 may continue to operate while the first drive circuit 110 is shut down.

It should be added that the third 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 third driving voltage may also be set to other voltage values during the switching process.

Through setting up switch module 120, can realize switching the connected mode of three-phase winding 100 according to the different operating frequency of motor, promote the operating efficiency of motor, and, through setting up second drive circuit 130, when switching the connected mode of three-phase winding 100, second drive circuit 130 can provide the second drive voltage for three-phase winding 100 in the connected state switching process of three-phase winding 100, in order to simulate the voltage environment that first switch group 121 and second switch group 122 were located in the switching process, therefore, when switching the connected mode, even first switch group 121 or second switch group 122 change the on-off state, the motor still normally operates, can realize the switching of not shutting down of motor three-phase winding 100 connected mode, do not influence the normal operating of compressor.

Referring to fig. 5 and 6, in an embodiment, each of the first driving circuit 110 and the second driving circuit 130 includes a first bridge arm 510, a second bridge arm 520, and a third bridge arm 530 connected in parallel, each of the first bridge arm 510, the second bridge arm 520, and the third bridge arm 530 includes two power switching tubes Q connected in series, and a diode D is connected in anti-parallel to each of the power switching tubes Q. The first bridge arm 510, the second bridge arm 520 and the third bridge arm 530 form a three-phase bridge structure, by controlling the on-off states of the six power switching tubes Q, the first driving circuit 110 can output sine wave alternating current signals for driving the motor to operate, that is, the first driving voltage can be provided for the three-phase winding 100, and similarly, the second driving circuit 130 can 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, or fourth 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, i.e., may provide the first driving voltage to the three-phase winding 100. At this time, when the three-phase winding 100 is in star connection, and the neutral point voltage is zero voltage, correspondingly, the three output terminals a2, B2 and C2 of the second driving circuit 130 can be adjusted to a PWM output with a 50% duty ratio, that is, 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 and the fourth driving voltage may be adjusted according to the connection state of the three-phase windings.

Illustratively, the power switch Q of the first driving circuit 110 is a metal oxide semiconductor MOS device, and the power switch Q of the second driving circuit 130 is an insulated gate bipolar IGBT device. The first driving circuit 110 is used as a main driving device of the motor, and the power switching tube Q thereof is an MOS device, which has a smaller current and a lower conduction voltage drop when the MOS device is under light load compared with an IGBT device, thereby having the advantage of high operating efficiency. The second driving circuit 130 is used for simulating a voltage environment where the first switch group 121 and the second switch group 122 are located in a switching process, and the power switch tube Q of the second driving circuit adopts an IGBT device, so that the second driving circuit has the advantage of low cost. Illustratively, the power switch Q of the first driving circuit 110 may employ a MOS device of Si material, or a MOS device of SiC material, or a MOS device of GaN material.

In an embodiment, the driving control circuit further includes a power supply component 140, the power supply component 140 is respectively connected to the first driving circuit 110 and the second driving circuit 130, and the first driving circuit 110 and the second driving circuit 130 are disposed in a common ground and a common bus. The power supply component 140 can provide input voltage for the first driving circuit 110 and the second driving circuit 130, so as to achieve the purpose of driving the motor and simulating the voltage environment of the first switch set 121 and the second switch set 122 during the switching process. In another embodiment, the power module 140 may be provided independently of the drive control circuit, and the first drive circuit 110 and the second drive circuit 130 may be provided in common and on a common bus, thereby improving the stability of operation.

In one embodiment, the power supply assembly 140 includes an ac power source 141 and a rectifying assembly 142 for converting the ac power source 141 into a dc output, the ac power source 141 is connected to the rectifying assembly 142, and the rectifying assembly 142 is connected to the first driving circuit 110 and the second driving circuit 130, respectively. By providing the rectifying component 142, the ac power source 141 can be converted into a dc output to adapt to the input signal requirements of the first driving circuit 110 and the second driving circuit 130.

In an embodiment, the driving control circuit further includes a filter component, and by setting the filter component, the interference signal of the power supply component 140 can be filtered out, so as to improve the stability of the power supply component 140. In one embodiment, the filter assembly comprises an electrolytic capacitor C, and the filter assembly adopts the electrolytic capacitor C, so that the filter assembly has the advantages of simple structure and low cost.

In an embodiment, the control of the first driving circuit 110, the switch assembly 120 and the second driving circuit 130 may be implemented by using a controller, for example, a single chip microcomputer.

In addition, referring to fig. 7, an embodiment of the present invention further provides a driving control method, which is applied to the driving control circuit shown in fig. 1 or fig. 2, and the driving control method includes, but is not limited to, the following steps:

step 701: controlling the switching of the switching assembly to switch the three-phase winding from the first connection state to the second connection state;

step 702: and controlling the second driving circuit to supply a second driving voltage to the three-phase windings during the switching of the connection state of the three-phase windings.

Wherein the first connection state and the second connection state have at least the following possible combinations:

referring to fig. 8, in a combination that the first connection state is star connection and the second connection state is delta connection, in this case, the step 702 of controlling the second driving circuit to provide the second driving voltage to the three-phase winding during the switching process of the connection state of the three-phase winding specifically includes the following steps:

step 801: the three-phase windings are in star connection, and the second driving circuit is controlled to output neutral point voltage of the three-phase windings in a star connection state;

step 802: controlling the first switch group to be switched off, and outputting neutral point voltage of the three-phase winding in a star connection state by the second driving circuit for a first time threshold value;

step 803: controlling a second driving circuit to output three-phase voltage of a three-phase winding in a triangular connection state;

step 804: controlling the second 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 second time threshold value;

step 805: and controlling the second driving circuit to stop working.

Specifically, in step 801, the motor is still operating in a star connected state; in step 802, controlling a second driving circuit to simulate a neutral point voltage of a three-phase winding in a star connection state, wherein the motor can still operate in the star connection state even if a first switch group is disconnected, and a first time threshold can be an action duration of the first switch group; in step 803, the motor is in a normal power supply state, and thus can be kept running; in step 804, the second driving circuit is controlled to simulate three-phase voltages of the three-phase winding in the delta connection state, that is, the motor can be operated in the delta connection state in the process of closing the second switch group, wherein the second time threshold is the action time length of the second switch group. It can be seen that through the above steps 801 to 805, non-stop switching of the motor can be realized.

Referring to fig. 9, in another combination, the first connection state is delta connection, and the second connection state is star connection, in this case, in step 702, the controlling the second driving circuit to provide the second driving voltage to the three-phase winding during the switching process of the connection state of the three-phase winding specifically includes the following steps:

step 901: 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 902: the second 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 second time threshold;

step 903: controlling a second driving circuit to output neutral point voltage of the three-phase winding in a star connection state;

step 904: controlling the first switch group to be closed, and outputting neutral point voltage of the three-phase winding in a star connection state by the second driving circuit for a first time threshold value;

step 905: and controlling the second driving circuit to stop working.

Specifically, in step 901, the motor is still in a delta connection state for operation; in step 902, controlling the second driving circuit to simulate three-phase voltages of the three-phase winding in a delta connection state, so that the motor can still operate in the delta connection state even if the second switch group is disconnected, wherein the second time threshold may be an action duration of the second switch group; in step 903, the motor is in a normal power supply state, so that the motor can keep running; in step 904, the second drive circuit is controlled to simulate the neutral point voltage of the three-phase winding in the star connection state, that is, the motor can be operated in the star connection state before the first switch group is closed, wherein the first time threshold is the action time of the first switch group. Therefore, through the steps 901 to 905, the non-stop switching of the motor can be realized.

The neutral point voltage when the three-phase winding is in the star connection state or the three-phase voltage when the three-phase winding is in the delta connection state is explained in the above embodiment of the driving control circuit, and will not be described again.

Referring to fig. 10, when the three-phase winding is switched between the delta connection and the open winding connection, the driving control method may further include the steps of:

step 1001: and controlling the second driving circuit to supply a third driving voltage to the three-phase windings during the switching of the connection state of the three-phase windings.

On the basis, referring to fig. 11, in a case where the first connection state is delta connection and the second connection state is open winding connection, the step 1001 described above controls the second driving circuit to provide the third driving voltage to the three-phase winding during the switching process of the connection state of the three-phase winding, and specifically includes the following steps:

step 1101: 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 1102: the second 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 second time threshold;

step 1103: and controlling the second driving circuit to output a fourth driving voltage.

Specifically, in step 1101, the motor is still operating in a delta connection state; in step 1102, controlling a second driving circuit to simulate three-phase voltages of a three-phase winding in a delta connection state, wherein the motor can still operate in the delta connection state even if a second switch group is disconnected, and a second time threshold may be an action duration of the second switch group; in step 1103, the second driving circuit is controlled to output a fourth driving voltage, and the three-phase winding operates in an open winding connection mode. It can be seen that the non-stop switching of the motor can be realized through the

above steps

1101 and 1103.

Referring to fig. 12, in another combination, the first connection state is an open winding connection, and the second connection state is a delta connection, in this case, in step 1001, the controlling the second driving circuit to provide the third driving voltage to the three-phase winding during the switching process of the connection state of the three-phase winding specifically includes the following steps:

step 1201: 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 1202: controlling the second 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 second time threshold value;

step 1203: and controlling the second driving circuit to stop working.

Specifically, in step 1201, the motor is still operating in an open winding 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, that is, during the closing process of the second switch group, the three-phase winding can be operated in the delta connection state first, wherein the second time threshold may be the action duration of the second switch group. It can be seen that through

steps

1201 and 1203 described above, non-stop switching of the motor can be achieved.

The switching of the switch assembly is controlled to enable the three-phase winding to be switched from the first connection state to the second connection state, the connection mode of switching the three-phase winding according to different working frequencies of the motor can be achieved, the running efficiency of the motor is improved, in the switching process, the second driving circuit is controlled to provide second driving voltage for the three-phase winding, and the voltage environment where the first switch group and the second switch group are located in the switching process is simulated.

In an embodiment, referring to fig. 13, the connection manner of the three-phase winding 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 from the delta connection to the star connection according to the operating frequency of the motor being lower than a first frequency threshold;

and controlling the opening and closing of the switch assembly to switch the three-phase winding from the star connection or the open winding connection to the delta connection according to the fact that the working frequency of the motor is higher than the first frequency threshold and lower than the second frequency threshold.

Controlling the switching of the switching assembly to switch the three-phase winding from the delta connection to the open winding connection according to the operating frequency of the motor being higher than a second frequency threshold;

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 second frequency threshold is greater than the first frequency threshold, and 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, referring to fig. 14, the connection manner of the three-phase windings is switched according to the operating frequency of the motor, and a third frequency threshold, a fourth frequency threshold, a fifth frequency threshold, and a sixth frequency threshold that are sequentially increased may be set, and specifically, a combination of one or more of the following determination manners may be included:

controlling the switching of the switch assembly to switch the three-phase winding from the delta connection to the star connection according to the fact that the working frequency of the motor is lower than a third frequency threshold;

controlling the switching of the switching assembly to switch the three-phase winding from the delta connection to the open winding connection according to the fact that the working frequency of the motor is higher than a sixth frequency threshold;

when the working frequency of the motor is judged, the third frequency threshold value and the fourth frequency threshold value can form a hysteresis interval, and the fifth frequency threshold value and the sixth 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 third frequency threshold, the fourth frequency threshold, the fifth frequency threshold, and the sixth frequency threshold may be determined according to an actual operation condition of the motor, and are not limited herein.

It should be noted that the method in the above embodiment is only schematically applied to the driving control circuit shown in fig. 1 or fig. 2, and may also be applied to other similar circuits.

Referring to fig. 15, fig. 15 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 the switching of the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch component, the operation efficiency of the motor is improved, and in addition, by arranging the second driving circuit, when the connection mode of the three-phase windings is switched, the second drive circuit can provide a second drive voltage for the three-phase windings during the switching of the connection state of the three-phase windings, so as to simulate the voltage environment of the first switch group and the second switch group in the switching process, therefore, when the connection mode is switched, even if the first switch group or the second switch group changes the on-off 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.

Referring to fig. 16, an embodiment of the present invention further provides an air conditioner, which includes the circuit board in the above embodiment, therefore, the air conditioner can realize the switching of the connection mode of the three-phase winding according to different working frequencies of the motor by arranging the switch component, improves the operation efficiency of the motor, and can improve the efficiency of the air conditioner by arranging the second driving circuit, when the connection mode of the three-phase windings is switched, the second drive circuit can provide a second drive voltage for the three-phase windings during the switching of the connection state of the three-phase windings, so as to simulate the voltage environment of the first switch group and the second switch group in the switching process, therefore, when the connection mode is switched, even if the first switch group or the second switch group changes the on-off 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.

Referring to fig. 17, fig. 17 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 1701 and a memory 1702, and fig. 17 illustrates one processor 1701 and one memory 1702.

The processor 1701 and the memory 1702 may be connected by a bus or other means, such as by a bus in fig. 17.

The memory 1702 is one type of non-transitory computer readable storage medium that may be used to store non-transitory software programs as well as non-transitory computer executable programs. Further, the memory 1702 may include high speed random access memory 1702, and may also include non-transitory memory 1702, such as at least one magnetic disk storage device, flash memory assembly, or other non-transitory solid state storage device. In some embodiments, the memory 1702 may optionally include memory 1702 located remotely from the processor 1701, and the remote memory 1702 may be coupled 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. 17 does not constitute a limitation of an air conditioner, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.

Non-transitory software programs and instructions required to implement the driving control method applied to the air conditioner in the above-described embodiment are stored in the memory 1702, and when executed by the processor 1701, the driving control method applied to the air conditioner in the above-described embodiment is performed, for example, the method steps 701 to 702 in fig. 7, the method steps 801 to 804 in fig. 8, the method steps 901 to 904 in the drawing, the method step 1001 in fig. 10, the method steps 1101 to 1102 in fig. 11, and the method steps 1201 to 1202 in fig. 12 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 1701, for example, by one of the processors 1701 in fig. 17, and may cause the one or more processors 1701 to execute the driving control method in the above-described method embodiment, for example, to execute the above-described method steps 701 to 702 in fig. 7, method steps 801 to 804 in fig. 8, method steps 901 to 904 in fig. 9, method step 1001 in fig. 10, method steps 1101 to 1102 in fig. 11, and method steps 1201 to 1202 in fig. 12.

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

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:

2. The drive control circuit according to claim 1, characterized in that: the second driving voltage is a neutral point voltage of the three-phase winding in the star connection state, or a three-phase voltage of the three-phase winding in the delta connection state.

3. The drive control circuit according to claim 1, characterized in that: the first switch group and the second switch group are both disconnected, the three-phase winding is switched to be connected with the open winding, the second driving circuit is further used for providing third driving voltage for the three-phase winding in the process that the three-phase winding is switched between the triangular connection and the open winding connection, and providing fourth driving voltage for the three-phase winding after the three-phase winding connection state is switched, and the third driving voltage is used for enabling the motor to keep running in the switching process of the three-phase winding connection state.

4. The drive control circuit according to claim 3, characterized in that: the third driving voltage is a three-phase voltage of the three-phase winding in the delta connection state.

5. The drive control circuit according to claim 1, characterized in that: the first switch group comprises a first switch and a second switch, the first three-phase outgoing line group comprises a first pin, a second pin and a third pin, the first switch is respectively connected with the first pin and the second pin, and the second switch is respectively connected with the second pin and the third pin.

6. The drive control circuit according to claim 1, characterized in that: the first switch group comprises a first switch, a second switch and a third switch, the first three-phase outgoing line group comprises a first pin, a second pin and a third pin, one ends of the first switch, the second switch and the third switch are connected with each other, and the other ends of the first switch, the second switch and the third switch are respectively and correspondingly connected with the first pin, the second pin and the third pin.

7. The drive control circuit according to claim 1, characterized in that: the second switch group comprises a fourth switch, a fifth switch and a sixth switch, the 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 fourth switch is respectively connected with the second pin and the sixth pin, the fifth switch is respectively connected with the third pin and the fifth pin, and the sixth switch is respectively connected with the first pin and the fourth pin.

8. 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 power switch tubes which are connected in series, and diodes are reversely connected in parallel on the power switch tubes.

9. The drive control circuit according to claim 1, characterized in that: the power supply assembly is connected with the first driving circuit and the second driving circuit respectively, and the first driving circuit and the second driving circuit are arranged in a common mode and in a common bus.

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, 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 drive control method includes:

11. The drive control method according to claim 10, wherein the first connection state is a star connection, the second connection state is a delta connection, and the controlling the second drive circuit to supply the second drive voltage to the three-phase windings during switching of the connection states of the three-phase windings includes:

and controlling the second driving circuit to stop working.

12. The drive control method according to claim 10, wherein the first connection state is a delta connection, the second connection state is a star connection, and the controlling the second drive circuit to supply the second drive voltage to the three-phase windings during switching of the connection states of the three-phase windings includes:

and controlling the second driving circuit to stop working.

13. The drive control method according to claim 10, characterized in that the first switch group and the second switch group are both open, the three-phase winding is switched to an open winding connection, the drive control method further comprising:

14. The drive control method according to claim 13, wherein the first connection state is a delta connection, the second connection state is an open winding connection, and the controlling the second drive circuit to supply the third drive voltage to the three-phase windings during switching of the three-phase winding connection state includes:

and controlling the second driving circuit to output a fourth driving voltage.

15. The drive control method according to claim 10, wherein the first connection state is an open winding connection, the second connection state is a delta connection, and the controlling the second drive circuit to supply the third drive voltage to the three-phase windings during switching of the three-phase winding connection state 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;

and controlling the second driving circuit to stop working.

16. The drive control method according to any one of claims 10 to 15, wherein the controlling of the opening and closing of the switching assembly to switch the three-phase winding from the first connection state to the second connection state includes at least one of:

controlling the switching of the switching assembly to switch the three-phase winding from star connection or open winding connection to delta connection according to the fact that the working frequency of the motor is higher than a first frequency threshold and lower than a second frequency threshold;

17. The drive control method according to any one of claims 10 to 15, wherein the controlling of the opening and closing of the switching assembly to switch the three-phase winding from the first connection state to the second connection state includes at least one of:

18. A circuit board, characterized by: comprising a drive control circuit according to any of claims 1 to 9.

19. An air conditioner, characterized in that:

comprising the wiring board of claim 18;

alternatively, the first and second electrodes may be,

comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a drive control method according to any one of claims 10 to 17.

20. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the drive control method according to any one of claims 10 to 17.