WO2021209036A1

WO2021209036A1 - Motor drive control circuit, driving method, circuit board, and air conditioner

Info

Publication number: WO2021209036A1
Application number: PCT/CN2021/087740
Authority: WO
Inventors: 黄招彬; 徐锦清; 李金波; 龙谭; 曾贤杰; 胡斌; 江海昊; 张杰楠; 赵鸣; 关平达; 时崎久; 堀部美彦; 文先仕
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2020-04-16
Filing date: 2021-04-16
Publication date: 2021-10-21
Also published as: JP2023517209A; JP7348409B2

Abstract

A drive control circuit, a driving method, a circuit board, and an air conditioner. The motor drive control circuit comprises a first power module (PM1) and a second power module (PM2) that are connected on two sides of an open winding motor, a first switch group (KY1), a controller, a totem pole PFC circuit (200), and a buck switch circuit (300); the controller is connected to the totem pole PFC circuit (200) so as to control the totem pole PFC circuit (200) to reach at least one of the following states: a diode rectification state, a low-frequency switch state, and a high-frequency switch state; and a diode rectification mode and a low-frequency switch mode that match the totem pole PFC circuit (200). The controller controls the buck switch circuit (300) to carry out buck output and supply to the first power module a voltage that is suitable for low-frequency work.

Description

Motor drive control circuit, drive method, circuit board and air conditioner

Cross-references to related applications

This application requires that the application number submitted on April 16, 2020 is 202010299960.8, the name is "motor drive control circuit, drive method, circuit board and air conditioner", and the application number submitted on April 16, 2020 is 202020572055.0, the name It is the priority of the Chinese patent application for "motor drive control circuit, circuit board and air conditioner", the entire content of which is incorporated into this application by reference.

Technical field

The present disclosure relates to the technical field of motor drive control, in particular to a motor drive control circuit, a drive method, a circuit board and an air conditioner.

Background technique

Frequency conversion motors are widely used in various frequency conversion equipment, such as frequency conversion air conditioners. The frequency conversion motor outputs a matching drive voltage according to the current load, thereby improving the operation efficiency of the frequency conversion equipment and achieving the purpose of energy saving. In order to meet the high frequency work requirements of variable frequency equipment, some variable frequency motors adopt an open-winding motor structure, which can achieve high torque and power in high-power driving occasions. However, compared to the single inverter motor winding structure, the open-winding motor structure has dual inverters, so the operating efficiency of the open-winding motor at low frequencies is not high, and it cannot meet the increasing energy-saving needs of users.

Summary of the invention

The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, the present disclosure proposes a drive control circuit, a drive method, a circuit board, and an air conditioner. By switching to a different working state, the open-winding motor can run at high frequency while improving the low-frequency operation of the open-winding motor. efficient.

The motor drive control circuit according to the embodiment of the first aspect of the present disclosure is used to drive an open-winding motor with three-phase windings. One end forms a second three-phase lead wire group, and the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The first switch group is connected to the second three-phase lead-out wire group, and is used to switch the three-phase winding between star connection and open winding connection;

A controller, respectively connected to the first power module, the second power module, and the first switch group;

A totem pole PFC circuit, the controller is connected to the totem pole PFC circuit to control the totem pole PFC circuit to achieve at least one of the following states:

Diode rectification state, low-frequency switching state and high-frequency switching state;

A step-down switch circuit, the totem pole PFC circuit, the step-down switch circuit, and the three-phase winding are sequentially connected, and the controller is connected to the step-down switch circuit to control the output voltage of the step-down switch circuit.

The motor drive control circuit according to the embodiment of the first aspect of the present disclosure has at least the following beneficial effects: on the basis of an open-winding motor, by controlling the switching of the first switch group, the switching of the working state of the totem PFC circuit, and the operation of the step-down switch circuit The state switching can realize different driving modes corresponding to the various loads of the open-winding motor. For example, when the open-winding motor is working at low frequency, the connection mode of the three-phase winding is switched to star connection by closing the first switch group, and at the same time Control the totem pole PFC circuit to work in the diode rectification state or the low frequency switch state, and control the step-down switch circuit to work in the step-down output state, so that the access loss of the second power module can be avoided, and the first power module can also get a better The low power supply voltage reduces the inverter conversion loss in the first power module, so that the open-winding motor can obtain a higher energy efficiency ratio under low-frequency operation and meet the energy-saving requirements.

According to some embodiments of the first aspect of the present disclosure, the totem pole PFC circuit further includes a first inductor, a first capacitor, and a bridge circuit, an AC input terminal, the first inductor, the bridge circuit, and the second A capacitor is connected in sequence, and the controller is connected with the bridge circuit.

According to some embodiments of the first aspect of the present disclosure, the bridge circuit includes a first bridge arm unit and a second bridge arm unit, and the first bridge arm unit includes a first rectifying component and a second rectifying component connected in series in the same direction The second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, and the first capacitor is connected to the output end of the bridge circuit and is connected in parallel with the first bridge arm unit. The first rectifying component, the second rectifying component, the third rectifying component, and the fourth rectifying component are respectively connected to the controller.

According to some embodiments of the first aspect of the present disclosure, the first rectifying component, the second rectifying component, the third rectifying component, and the fourth rectifying component are semiconductor switching devices, and the first rectifying component, The second rectifying component, the third rectifying component and the fourth rectifying component are all provided with anti-parallel diodes.

According to some embodiments of the first aspect of the present disclosure, the first rectifying component and the second rectifying component are semiconductor switching devices, the third rectifying component and the fourth rectifying component are diodes, and the first rectifying component is a diode. The component and the second rectifying component are provided with anti-parallel diodes. According to some embodiments of the first aspect of the present disclosure, the step-down switching circuit includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth switching device, a sixth freewheeling device, a second inductor, and a second capacitor , The output terminal of the totem pole PFC circuit, the fifth switching device, the sixth freewheeling device and the reference ground are connected in sequence, and the connection point between the fifth switching device and the sixth freewheeling device , The second inductor and the second capacitor are sequentially connected to a reference ground, and a connection point between the second inductor and the second capacitor is connected to the first power module.

According to some embodiments of the first aspect of the present disclosure, the fifth switching device is provided with an anti-parallel diode.

According to another embodiment of the first aspect of the present disclosure, a motor drive control circuit is used to drive an open-winding motor with three-phase windings. The other end of the is composed of a second three-phase lead-out wire group, and the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The totem pole PFC circuit includes a first inductor, a first capacitor, and a bridge circuit, the first inductor, the bridge circuit, and the first capacitor are connected in sequence, and the bridge circuit includes a first bridge arm unit and A second bridge arm unit, the first bridge arm unit includes a first rectifying component and a second rectifying component connected in series in the same direction, and the second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, The first capacitor is connected to the output terminal of the bridge circuit and is connected in parallel with the first bridge arm unit;

A step-down switch circuit, the totem pole PFC circuit, the step-down switch circuit, and the three-phase winding are sequentially connected, the step-down switch circuit includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth The switching device, the sixth freewheeling device, the second inductor and the second capacitor, the output end of the totem pole PFC circuit, the fifth switching device, the sixth freewheeling device and the reference ground are connected in sequence, and the first Five connection points between the switching device and the sixth freewheeling device, the second inductor and the second capacitor are connected to the reference ground in sequence, and the connection point between the second inductor and the second capacitor Connect the first power module.

According to some embodiments of the first aspect of the present disclosure, further comprising a second switch group, the second switch group is respectively connected to the first three-phase lead-out wire group and the second three-phase lead-out wire group, the first One switch group is opened, the second switch group is closed, and the three-phase winding is switched to a delta connection.

According to some embodiments of the first aspect of the present disclosure, the step-down switch circuit further includes a short-circuit switch, and the short-circuit switch is connected in parallel with the step-down chopper circuit.

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The totem pole PFC circuit is used to achieve at least one of the following states according to the load of the open-winding motor:

The step-down switch circuit is used to enter different voltage output states according to the load of the open-winding motor, and the totem pole PFC circuit, the step-down switch circuit and the three-phase winding are connected in sequence.

The driving method according to the embodiment of the second aspect of the present disclosure is used to drive an open-winding motor with three-phase windings. The second three-phase lead wire group is characterized in that the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

Totem pole PFC circuit, used to achieve at least one of the following states:

A step-down switch circuit, the totem pole PFC circuit, the step-down switch circuit and the three-phase winding are connected in sequence;

The driving method includes:

According to the load of the open-winding motor, the first switch group is controlled to close so that the three-phase winding is switched to star connection, the totem pole PFC circuit is controlled to enter the diode rectification state or the low-frequency switching state, and the control The step-down switch circuit performs step-down output.

The driving method according to the embodiment of the second aspect of the present disclosure has at least the following beneficial effects: on the basis of the open-winding motor, by controlling the switching of the first switch group, the switching of the working state of the totem PFC circuit, and the working state of the step-down switch circuit Switching can realize different driving modes corresponding to various loads of the open-winding motor. For example, when the open-winding motor works at low frequency, the connection mode of the three-phase windings can be switched to star connection by closing the first switch group, and the totem can be controlled at the same time The column PFC circuit works in the diode rectification state or the low-frequency switch state, and controls the step-down switch circuit to work in the step-down output state, so that the access loss of the second power module can be avoided, and the first power module can also get a lower The power supply voltage, thereby reducing the inverter conversion loss in the first power module, enables the open-winding motor to obtain a higher energy efficiency ratio under the low-frequency operation state, and meet the energy-saving requirements.

According to some embodiments of the second aspect of the present disclosure, the totem pole PFC circuit further includes a bridge circuit, the bridge circuit includes a first bridge arm unit and a second bridge arm unit, and the first bridge arm unit includes the same The first rectifying component and the second rectifying component are connected in series, the second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, and the first capacitor is connected to the output end of the bridge circuit and Connected in parallel with the first bridge arm unit;

The controlling the totem pole PFC circuit to enter a diode rectification state includes:

The first rectifying component, the second rectifying component, the third rectifying component and the fourth rectifying component are continuously turned off.

The controlling the totem pole PFC circuit to enter a low-frequency switch state includes:

During the positive half cycle of the AC input, the fourth rectifying component is continuously turned on, the second rectifying component and the third rectifying component are continuously turned off, and when a current flows through the first rectifying component In the segment, the first rectifying component is turned on;

During the negative half cycle of the AC input, the third rectifying component is continuously turned on, the first rectifying component and the fourth rectifying component are continuously turned off, and when a current flows through the second rectifying component In the segment, the second rectifying component is turned on.

According to some embodiments of the second aspect of the present disclosure, the driving method further includes:

According to the load of the open-winding motor, the totem pole PFC circuit is controlled to enter a high-frequency switching state, and the step-down switch circuit is controlled to perform a filtered output.

The controlling the totem pole PFC circuit to enter a high frequency switch state includes:

During the positive half cycle of the AC input, the first rectifying component is switched on and off by high frequency, the fourth rectifying component is continuously turned on, and the second rectifying component and the third rectifying component are continuously turned off;

In the negative half cycle of the AC input, the second rectifying component is switched on and off by high frequency, the third rectifying component is continuously turned on, and the first rectifying component and the fourth rectifying component are continuously turned off.

According to some embodiments of the second aspect of the present disclosure, the step-down switching circuit includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth switching device, a sixth freewheeling device, a second inductor, and a second capacitor , The output terminal of the totem pole PFC circuit, the fifth switching device, the sixth freewheeling device and the reference ground are connected in sequence, and the connection point between the fifth switching device and the sixth freewheeling device , The second inductor and the second capacitor are sequentially connected to a reference ground, and the connection point between the second inductor and the second capacitor is connected to the first power module;

The controlling the step-down switch circuit to perform step-down output includes:

Controlling the high-frequency switching of the fifth switching device;

In the on state of the fifth switching device, control the sixth freewheeling device to turn off, and in the off state of the fifth switching device, control the sixth freewheeling device to turn on or off .

According to the load of the open-winding motor, controlling the totem pole PFC circuit to enter a high-frequency switching state, and controlling the step-down switching circuit to perform filtered output;

The controlling the step-down switch circuit to perform filtering output includes:

The fifth switching device is controlled to be continuously turned on, and the sixth freewheeling device is controlled to be continuously turned off.

According to some embodiments of the second aspect of the present disclosure, the step-down switch circuit further includes a short-circuit switch, and the short-circuit switch is connected in parallel with the step-down chopper circuit;

The driving method further includes: controlling the totem pole PFC circuit to enter a high-frequency switching state according to the load of the open-winding motor, and controlling the short-circuit switch to close.

According to some embodiments of the second aspect of the present disclosure, the motor drive control circuit further includes a second switch group, the second switch group is respectively connected to the first three-phase lead-out wire group and the second three-phase lead-out wire Group connection, the first switch group is opened, the second switch group is closed, and the three-phase winding is switched to a delta connection;

The driving method further includes:

According to the load of the open-winding motor, control the first switch group to open and the second switch group to close, so that the three-phase winding is switched to delta connection, and the totem pole PFC circuit is controlled to enter the high-frequency switching state , And control the step-down switch circuit to filter output.

According to some embodiments of the second aspect of the present disclosure, the load of the open-winding motor is the operating power parameter of the open-winding motor, and the driving method includes:

According to the operating power parameters of the open-winding motor, control the totem pole PFC circuit, the step-down switch circuit, the first switch group, and the second switch group to achieve at least one of the following states:

The operating power parameter of the open-winding motor is less than the first operating power parameter, the first switch group is controlled to be closed and the second switch group is opened to switch the stator windings into star connection, and the totem is controlled The column PFC circuit enters the diode rectification state, and controls the step-down switch circuit to perform step-down output;

The operating power parameter of the open-winding motor is greater than the first operating power parameter and less than the second power operating parameter, and the first switch group is controlled to be closed and the second switch group is opened to switch the stator winding to Star connection, and controlling the totem pole PFC circuit to enter a low-frequency switching state, and controlling the step-down switch circuit to perform a step-down output;

The operating power parameter of the open-winding motor is greater than the second operating power parameter and less than the third power operating parameter, and the first switch group is controlled to be closed and the second switch group is opened to switch the stator winding to Star connection, and controlling the totem pole PFC circuit to enter a high-frequency switching state, and controlling the step-down switch circuit to filter output;

The operating power parameter of the open-winding motor is greater than the third operating power parameter and less than the fourth power operating parameter, and the first switch group is controlled to be opened and the second switch group is closed so that the stator winding is switched to Delta connection, and controlling the totem pole PFC circuit to enter a high-frequency switching state, and controlling the step-down switch circuit to perform filtered output;

The operating power parameter of the open-winding motor is greater than the fourth power operating parameter, the first switch group is controlled to be disconnected and the second switch group is disconnected so that the stator winding is switched to the open winding connection, and the control The totem pole PFC circuit enters a high-frequency switch state, and controls the step-down switch circuit to perform filtered output.

A circuit board according to an embodiment of the third aspect of the present disclosure includes the motor drive control circuit according to any one of the embodiments of the first aspect.

The circuit board according to the embodiment of the third aspect of the present disclosure has at least the following beneficial effects: the circuit board carries the above-mentioned motor drive control circuit, which facilitates the installation of the circuit board in the device to apply the function of the above-mentioned motor drive control circuit, that is, when the winding motor is turned on On the basis of this, by controlling the switching of the first switch group, the switching of the working state of the totem PFC circuit, and the switching of the working state of the step-down switch circuit, different driving modes can be realized corresponding to the various loads of the open-winding motor, for example, when the winding is open When the motor is working at low frequency, the connection mode of the three-phase winding is switched to star connection by closing the first switch group, and at the same time, the totem pole PFC circuit is controlled to work in the diode rectification state or the low frequency switch state, and the step-down switch circuit is controlled to work in the step-down state. Output state, so that the access loss of the second power module can be avoided, and the first power module can also get a lower power supply voltage, thereby reducing the inverter conversion loss in the first power module, so that the open-winding motor works at low frequencies. In the state of operation, a higher energy efficiency ratio is obtained to meet the energy-saving needs.

An air conditioner according to an embodiment of the fourth aspect of the present disclosure, and the circuit board according to the third aspect;

or,

It includes at least one processor and a memory for communicating with the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to The at least one processor is enabled to execute the driving method according to any one of the second aspect.

The air conditioner according to the embodiment of the fourth aspect of the present disclosure has at least the following beneficial effects: installing a circuit board integrated with a motor drive control circuit in the air conditioner or executing a corresponding drive method can apply the functions of the motor drive control circuit described above. On the basis that the motor of the air conditioner is an open-winding motor, by controlling the switching of the first switch group, the switching of the working state of the totem PFC circuit, and the switching of the working state of the step-down switch circuit, different loads of the open-winding motor can be realized. For example, when the open-winding motor works at low frequency, the connection mode of the three-phase winding is switched to star connection by closing the first switch group, and the totem pole PFC circuit is controlled to work in the diode rectification state or the low-frequency switching state at the same time, Control the step-down switch circuit to work in the step-down output state, so that the access loss of the second power module can be avoided, and the first power module can also get a lower power supply voltage, thereby reducing the inverter in the first power module The conversion loss enables the open-winding motor to obtain a higher energy efficiency ratio under low-frequency operation and meet the energy-saving requirements.

A computer-readable storage medium according to an embodiment of the fifth aspect of the present disclosure, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute any of the The driving method described in one item.

The additional aspects and advantages of the present disclosure will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present disclosure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a circuit diagram of a motor drive control circuit provided by an embodiment of the disclosure;

2 is an equivalent circuit diagram of the motor drive control circuit when the totem pole PFC circuit is in the diode rectification state, the step-down switch circuit is in the step-down output state, and the stator winding is in the star connection state according to an embodiment of the present disclosure;

FIG. 3 is an equivalent circuit diagram of the motor drive control circuit when the totem pole PFC circuit is in the low-frequency switching state, the step-down switch circuit is in the step-down output state, and the stator winding is in the star connection state according to an embodiment of the present disclosure;

4 is an equivalent circuit diagram of the motor drive control circuit when the totem pole PFC circuit is in the high-frequency switching state, the step-down switch circuit is in the equal-voltage output state, and the stator windings are in the star connection state according to an embodiment of the present disclosure;

5 is an equivalent circuit diagram of the motor drive control circuit when the totem pole PFC circuit is in the high-frequency switching state, the step-down switch circuit is in the equal-voltage output state, and the stator windings are in a delta connection state according to an embodiment of the present disclosure;

6 is an equivalent circuit diagram of the motor drive control circuit when the totem pole PFC circuit is in the high-frequency switch state, the step-down switch circuit is in the equal voltage output state, and the stator winding is in the open winding connection state according to an embodiment of the present disclosure;

FIG. 7 is a waveform diagram corresponding to the working state of FIG. 2 and FIG. 3 provided by an embodiment of the present disclosure;

FIG. 8 is a waveform diagram corresponding to the working state of FIG. 4 to FIG. 6 provided by an embodiment of the present disclosure;

FIG. 9 is a circuit diagram of a motor drive control circuit provided by another embodiment of the disclosure;

Fig. 10 is a structural diagram of a control device provided by an embodiment of the present disclosure;

FIG. 11 is a flowchart of a driving method provided by an embodiment of the present disclosure;

FIG. 12 is a flowchart of a driving method provided by another embodiment of the present disclosure;

FIG. 13 is a flowchart of a driving method provided by another embodiment of the present disclosure;

FIG. 14 is a flowchart of a driving method provided by another embodiment of the present disclosure;

FIG. 15 is a flowchart of a driving method provided by another embodiment of the present disclosure;

FIG. 16 is a flowchart of a driving method provided by another embodiment of the present disclosure;

FIG. 17 is a flowchart of a driving method provided by another embodiment of the present disclosure;

FIG. 18 is a diagram of the corresponding working states of the motor drive control circuit under different operating power parameters provided by an embodiment of the present disclosure.

Detailed ways

The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present disclosure, and cannot be understood as a limitation to the present disclosure.

In the description of the present disclosure, several meanings are one or more, multiple meanings are two or more, greater than, less than, exceeding, etc. are understood to not include the number, and above, below, and within are understood to include the number. If it is described that the first and second are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features or implicitly specifying the order of the indicated technical features relation.

In the description of the present disclosure, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the foregoing terms in the present disclosure in combination with the specific content of the technical solution.

The motor drive control circuit realizes frequency conversion control in the equipment by providing variable voltage. In order to meet the high frequency operation requirements of frequency conversion equipment, some frequency conversion motors adopt an open winding motor structure, which can achieve high torque and Power, such as inverter air conditioners, but the open-winding motor can ensure high-frequency operation, but the operating efficiency of the open-winding motor at low frequencies is not ideal. This is particularly obvious in the extremely low-frequency working state, because the two open-winding motors Inverters have conduction loss and switching loss, and the low-frequency output of the drive control circuit of the open-winding motor often has only one voltage value, which corresponds to a low-frequency working state with the best operating efficiency. When the device enters a lower frequency In the working state, the motor drive control circuit can only drive the motor through this voltage value. At this time, the operating efficiency of the equipment is reduced, and the energy loss in the circuit is increased. Obviously, it cannot meet people's growing energy-saving needs.

Based on this, the present disclosure proposes a motor drive control circuit, a drive method, a circuit board, an air conditioner, and a computer-readable storage medium. When the device is running in a low frequency state, the different working states of the totem pole PFC circuit cooperate with the step-down The switch circuit obtains a lower power supply voltage, so as to match the different working states of the open-winding motor. Under the premise of ensuring the high-frequency operation of the open-winding motor, the low-frequency operation efficiency of the open-winding motor is improved.

Those skilled in the art know that an open-winding motor has three windings and a total of six terminals. The three windings include a first phase winding, a second phase winding, and a third phase winding to form a three-phase power supply. Each winding includes two terminals. , That is, the two ends of the first phase winding lead to the first pin and the sixth pin, the two ends of the second phase winding lead to the second pin and the fifth pin, and the two ends of the third phase winding lead to the first pin. Three pins and fourth pins. In this way, the first pin, second pin, and third pin form a three-phase lead wire on one side of the open-winding motor. The fourth pin, fifth pin, and sixth lead The legs form the three-phase lead wire on the other side of the open-winding motor, and the open-winding motor can be driven by connecting the three-phase lead wires on both sides of the open-winding motor through two inverter modules.

The embodiments of the present disclosure will be further described below in conjunction with the accompanying drawings.

1, FIG. 1 is a circuit diagram of a motor drive control circuit provided by the first aspect of an embodiment of the present disclosure. The motor drive control circuit is used to drive an open-winding motor with a three-phase winding 100, and one end of each phase winding is composed of The first three-phase lead wire group 110, the other end of each phase winding forms the second three-phase lead wire group 120, and the motor drive control circuit includes:

The first power module PM1 is connected to the first three-phase lead wire group 110;

The second power module PM2 is connected to the second three-phase lead wire group 120;

The first switch group KY1 is connected to the second three-phase lead wire group 120, and is used to switch the three-phase winding 100 between star connection and open winding connection;

The controller is respectively connected to the first power module PM1, the second power module PM2 and the first switch group KY1;

Totem-pole PFC circuit 200 (Totem-pole PFC), the controller is connected to the totem-pole PFC circuit 200 to control the totem-pole PFC circuit 200 to achieve at least one of the following states:

The step-down switch circuit 300, the totem pole PFC circuit 200, the step-down switch circuit 300, and the three-phase winding 100 are sequentially connected, and the controller is connected to the step-down switch circuit 300 to control the output voltage of the step-down switch circuit 300.

In an embodiment, the motor drive control circuit is used to drive an open-winding motor with three-phase windings 100, one end of each phase winding forms a first three-phase lead-out wire group 110, and the other end of each phase winding forms a second three-phase Lead wire group 120, the motor drive control circuit includes:

The totem pole PFC circuit 200 is used to achieve at least one of the following states according to the load of the open-winding motor:

The step-down switch circuit 300 is used to enter different voltage output states according to the load of the open-winding motor. The totem pole PFC circuit 200, the step-down switch circuit 300 and the three-phase winding 100 are sequentially connected.

In one embodiment, the working state of the totem pole PFC circuit 200 is switched by the controller to enter the diode rectification state, the low frequency switching state or the high frequency switching state; wherein, the diode rectification state of the totem pole PFC circuit 200 is suitable for low current output , Because the circuit loss at this time is equal to the conduction loss caused by the diode, the diode conduction loss is not high at a small current, which is suitable for the extremely low frequency output of the open-winding motor; however, under the large current, the voltage drop of the diode increases and the conduction The conduction loss increases correspondingly, and the operating efficiency of the circuit decreases. Therefore, when the winding motor increases the operating frequency and the totem pole PFC circuit 200 needs to output a larger current, the diode rectification state is no longer applicable, and the totem pole PFC circuit 200 switches to In the low-frequency switching state to obtain a higher output voltage, in the low-frequency switching state, some or all of the diodes in the totem pole PFC circuit 200 are replaced by switching devices. Because the conduction loss of the switching devices is lower than the conduction loss of the diodes, a higher output voltage can be obtained. The low conduction voltage drop improves the operating efficiency of the open-winding motor; when the open-winding motor enters high-frequency operation, the totem pole PFC circuit 200 needs to output high voltage, and the low-frequency switching state is no longer applicable. At this time, the totem pole PFC circuit 200 switches In a high-frequency switching state, the duty cycle of the switching device is increased to obtain a higher voltage and current to adapt to the operating efficiency under high-frequency output. As for the specific circuit structure of the totem pole PFC circuit 200 and how to enter the corresponding working state, it will be described in detail in the following embodiments.

Although the totem pole PFC circuit 200 can adjust the output voltage, the PFC circuit does not have a step-down function, and in practical applications to ensure that the open winding motor with high back-EMF coefficient can smoothly enter the high frequency, the totem pole PFC circuit 200 has a step-up Components, such as inductors, but this leads to unsatisfactory efficiency at the intermediate frequency. Therefore, it is necessary to combine the step-down switch circuit 300 to obtain a lower voltage output to meet the energy-saving requirements of low-frequency operation of the motor. The step-down in this embodiment The switch circuit 300 is connected to the output terminal of the totem pole PFC circuit 200. The output voltage of the totem pole PFC circuit 200 in the diode rectification state or the low-frequency switching state is processed by the step-down switch circuit 300 and becomes a lower voltage to meet the low frequency of the device. Operational requirements.

It is understandable that the step-down switch circuit 300 can be a step-down circuit composed of discrete components, or an integrated packaged voltage conversion chip; the step-down switch circuit 300 can output different driving voltages in different working modes, for example, The step-down switch circuit 300 is a buck circuit, and the controller can control the switching of the switch tube in the buck circuit to make the buck circuit operate in the step-down mode or the LC filter mode. For another example, the step-down switch circuit 300 is a voltage conversion chip. The controller is connected to the enable terminal of the chip to control the enable signal, and the voltage conversion chip can output voltage values of different levels.

The first power module PM1 and the second power module PM2 are connected to the three-phase winding 100 to achieve inverter conversion, provide driving voltage for the motor, and also constitute the connection structure of the open winding motor; the first power module PM1 and the second power module PM2 can be a modular circuit composed of discrete devices. For example, the first power module PM1 and the second power module PM2 are three-phase bridge inverter circuits composed of six switching devices. At this time, the switching devices can be IGBT devices. , Si material MOSFET, SiO material MOSFET or GaN material MOSFET, the first power module PM1 and the second power module PM2 can also be integrated packaged intelligent power modules, such as IPM modules (Intelligent Power Module), which can also achieve reverse Change the function of conversion.

1, the first switch group KY1 is connected to the first three-phase lead wire 110, the controller controls the first switch group KY1 to close, the three-phase winding 100 is switched to star connection, and the controller controls the first switch group KY1 to open, The three-phase winding 10 is switched to open winding connection. In the low-frequency operation state of the motor, the operating efficiency of the star connection is better than that of the open winding connection. Therefore, the connection mode of the three-phase winding 100 is switched by adding the first switch group KY1 to adapt to the low-frequency operation of the motor; There are multiple implementations of a switch group KY1. Specifically, in one embodiment, the first switch group KY1 includes a first switch and a second switch, and the second three-phase lead-out line group 120 includes a first pin. M1, the second pin M2, and the third pin M3. The first three-phase lead group 110 includes a fourth pin M4, a fifth pin M5, and a sixth pin M6. The first switch is respectively connected to the first pin M1 and the second pin M2, the second switch is respectively connected to the second pin M2 and the third pin M3, when the first switch and the second switch are closed at the same time, the first pin M1, the second pin M2 and the third pin The pins M3 are connected to each other, so that the three-phase winding 100 is in a star connection state, as shown in FIGS. 2, 3, 4, and 6. Since the second power module PM2 is not connected to the motor drive circuit in the star connection state, the loss caused by the second power module PM2 can be ignored. With the totem pole PFC circuit 200 and the step-down switch circuit 300, the motor can be operated at low frequencies. The operating efficiency of the system has been greatly improved. When the star-connected three-phase winding 100 needs to enter the high-frequency working state, the first switch group KY1 is disconnected to switch back to the open winding state, so as to adapt to the high-frequency operation of the motor.

It is understandable that the two switches of the first switch group KY1 can be separate components or integrated on a single component. For example, the first switch and the second switch are electromagnetic relays, contactors, solid state relays, or conductors respectively. An electronic switch whose on-resistance does not exceed 1 ohm; for another example, the first switch and the second switch are integrated on a rotary switch, and turning the rotary switch can make the first switch and the second switch close and open at the same time; the first switch group KY1 There are many implementation methods for different switching forms, which have different switching times. Different switching forms can be selected according to the response requirements of the motor drive control circuit, which will not be repeated here.

1, in an embodiment, the totem pole PFC circuit 200 includes a first inductor L1, a first capacitor C1, and a bridge circuit. The AC input terminal, the first inductor L1, the bridge circuit, and the first capacitor C1 are connected in sequence. The controller is connected to the bridge circuit. In this embodiment, the totem pole PFC circuit 200 is a boost rectifier circuit, and one end of the AC input terminal (such as the mains input, including two connection ports) is connected to the first inductor L1 to realize the boost, and then the bridge circuit is rectified Then output the DC voltage, and finally use the first capacitor C1 to realize the power factor correction (PFC) of the circuit, and use the characteristics of the current leading voltage on the first capacitor C1 to compensate for the current lagging voltage characteristics of the first inductor L1 To make the characteristics of the bridge circuit close to resistive, thereby improving the rectification efficiency.

In an embodiment, the bridge circuit includes a first bridge arm unit and a second bridge arm unit, the first bridge arm unit includes a first rectifying component T1 and a second rectifying component T2 connected in series in the same direction, and the second bridge arm unit includes The third rectifying component T3 and the fourth rectifying component T4 are connected in series in the same direction. The first capacitor C1 is connected to the output end of the bridge circuit and is connected in parallel with the first bridge arm unit. The first rectifying component T1, the second rectifying component T2, and the third The rectifying part T3 and the fourth rectifying part T4 are respectively connected to the controller.

The bridge circuit in this embodiment is used to implement the rectification function. In terms of circuit structure, the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 are all the same in the bridge circuit. To form a rectifier bridge; the selection of the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 can be adjusted according to the requirements of the circuit, for example, the first rectifying component T1 The second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 are all MOSFETs, so in the first bridge arm unit, the source of the first rectifying component T1 is connected to the drain of the second rectifying component T2, In the second bridge arm unit, the source of the third rectifying component T3 is connected to the drain of the fourth rectifying component T4, the drain of the first rectifying component T1 is connected to the drain of the third rectifying component T3, and the source of the second rectifying component T2 The source of the fourth rectifying component T4 is connected, the AC input terminal is respectively connected to the source of the first rectifying component T1 and the source of the third rectifying component T3, and the drain of the first rectifying component T1 is the positive output terminal of the bridge circuit, The source of the second rectifying component T2 is the negative output terminal of the bridge circuit. The above circuit structure is only exemplary, and the actual circuit can be adjusted accordingly according to control requirements.

In fact, in order to realize the diode rectification state, low-frequency switching state and high-frequency switching state, the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 have certain requirements in the selection. In one embodiment, the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 are semiconductor switching devices, and the first rectifying component T1, the second rectifying component T2, and the third rectifying component T4 are semiconductor switching devices. Both the component T3 and the fourth rectifying component T4 are provided with anti-parallel diodes. The anti-parallel diodes can be separate diode elements or parasitic diodes. In this embodiment, the first rectifying component T1 and the second rectifying The component T2, the third rectifying component T3, and the fourth rectifying component T4 are respectively connected to the enable terminal of the controller to switch the working state of the totem pole PFC circuit 200. For example, the controller has at least four enable pins, and the first rectifier The components T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 are all MOSFETs, so the gates of the rectifying components T1 to T4 are respectively connected to the four enable pins of the controller; In the embodiment, the first rectifying component T1 and the second rectifying component T2 are semiconductor switching devices, the third rectifying component T3 and the fourth rectifying component T4 are diodes, and only the first rectifying component T1 and the second rectifying component T2 are provided with reverse Diodes are connected in parallel. In this embodiment, the two enable pins of the controller are respectively connected to the gates of the first rectifying component T1 and the second rectifying component T2 to achieve switching control, while the third rectifying component T3 and the fourth rectifying component T3 and the fourth rectifying component are connected to the gates of the The component T4 is an ordinary diode, which does not need to be controlled, and can also switch the working state of the totem pole PFC circuit 200.

In the following, taking the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 as MOSFETs as an example, several working states of the totem pole PFC circuit 200 are described:

Diode rectification state: referring to Figures 2 and 7, the controller controls the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 to be in a continuous off state. At this time, the current can only be positive Totem pole PFC circuit 200 is equivalent to a bridgeless boost PFC circuit through anti-parallel diodes; since the loss of AC power through the bridge circuit only comes from the conduction loss of the diode, the conduction loss of the diode is related to the current, so the diode rectifies The state is suitable for small current situations;

Low-frequency switching state: Refer to Figure 3 and Figure 7, also called synchronous rectification state. Compared with the diode rectification state, the current in the circuit increases, and the diode's conduction voltage drop also increases, so a low conduction loss MOSFET is used To reduce the impact of the conduction loss of the diode, specifically, during the positive half cycle of the alternating current, the second rectifying component T2 and the third rectifying component T3 are continuously turned off, the fourth rectifying component T4 is continuously turned on, and the first rectifying component T4 is continuously turned on. The component T1 is turned on during the time period when there is current flowing through its anti-parallel diode. In the negative half cycle of the alternating current, the first rectifying component T1 and the fourth rectifying component T4 are continuously turned off, and the third rectifying component T3 is continuously turned on. The second rectifying component T2 is turned on during the time period when there is current flowing through its anti-parallel diode. Since the turn-on voltage drop of the MOSFET is very low, the rectification loss at the output end can be reduced, thereby improving the conversion efficiency, which is suitable for lower voltages. The situation of large current;

High-frequency switching state: referring to Figures 4 and 8, in the positive half cycle of the alternating current, the controller controls the high-frequency switching of the first rectifying component T1 while the fourth rectifying component T4 continues to conduct, the second rectifying component T2 and the third rectifying component The component T3 is continuously turned off. In the negative half cycle of the alternating current, the controller controls the high-frequency switching of the second rectifying component T2 while the third rectifying component T3 is continuously turned on, and the first rectifying component T1 and the fourth rectifying component T4 are continuously turned off. By controlling the duty cycle of the high-frequency switching, a large voltage and large current output can be obtained at the output end of the totem pole PFC circuit 200, which is suitable for the high-frequency working state of the motor.

In one embodiment, the step-down switching circuit 300 includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth switching device Q5, a sixth freewheeling device Q6, a second inductor L2, and a second capacitor C2. The output end, the fifth switching device Q5, the sixth free-wheeling device Q6 and the reference ground are connected in sequence, the connection point between the fifth switching device Q5 and the sixth free-wheeling device Q6, the second inductor L2 and the second capacitor C2 and the reference The ground is connected in sequence, and the connection point between the second inductor L2 and the second capacitor C2 is connected to the first power module PM1.

In this embodiment, the step-down chopper circuit is a buck step-down circuit, the fifth switching device Q5 is used for on-off control, and the sixth freewheeling device Q6 is used as a freewheeling device to cooperate with the second inductor L2 and the second capacitor C2 to form a chopper. Output, in the selection, the fifth switching device Q5 and the sixth freewheeling device Q6 can both be power switch tubes and connected to the enable end of the controller. In this case, the step-down chopper circuit works under the control of the controller There are two modes as follows:

One is the mode of step-down output. With reference to Figures 2 and 3, the controller controls the fifth switching device Q5 to be turned off and on periodically, and the sixth freewheeling device Q6 is turned off when the fifth switching device Q5 is turned on. , When the fifth switching device Q5 is turned off, it is turned off or turned on, and the controller adjusts the step-down amplitude by controlling the duty cycle of the fifth switching device Q5; the step-down output state can obtain a lower voltage, which is suitable for cooperating with totem poles The diode rectification state and the low-frequency switching state of the PFC circuit 200;

The other is the filtering output mode. Referring to Figures 4 to 6, the controller controls the fifth switching device Q5 to be continuously turned on, and the sixth freewheeling device Q6 to continuously turn off. At this time, the step-down chopper circuit is equivalent to LC The filter circuit has negligible voltage drop and is suitable for the high frequency switching state of the totem pole PFC circuit 200.

It can be seen from the above two working modes that the sixth freewheeling device Q6 can be replaced with a diode. In this case, since the diode is not controllable, the sixth freewheeling device Q6 does not need to be connected to the controller.

In an embodiment, the fifth switching device Q5 is provided with an anti-parallel diode. In this embodiment, by adding an anti-parallel diode, the fifth switching device Q5 can be prevented from being damaged by reverse breakdown. Of course, the fifth switching device Q5 may also have no anti-parallel diode, which does not affect the functions to be implemented by the fifth switching device Q5.

In an embodiment, referring to FIG. 1, the step-down switch circuit 300 further includes a short-circuit switch KY3, and the short-circuit switch KY3 is connected in parallel with the step-down chopper circuit. After the short switch KY3 is closed, the step-down chopper circuit can be short-circuited, which is equivalent to that the step-down chopper circuit does not work. The output of the totem pole PFC circuit 200 is directly input to the first power module PM1, due to the output of the totem pole PFC circuit 200 It has not been processed for voltage reduction, so the condition that the short-circuit switch KY3 is closed is suitable for the high-frequency working state of the motor, which is equivalent to the step-down switch circuit 300 working in the direct output mode.

In the above embodiment, the switching between the star connection and the open winding connection is realized through the opening and closing of the first switch group KY1, but there is still a certain gap between the optimal operating frequency corresponding to the star connection and the open winding connection. In this embodiment, delta connection is introduced to adapt to the operation of the motor at high frequency. Based on this, the following winding switching structure can be used:

1, in an embodiment, it further includes a second switch group KY2. The second switch group KY2 is respectively connected to the first three-phase lead-out line group 110 and the second three-phase lead-out line group 120, and the first switch group KY1 is open , The second switch group KY2 is closed, and the three-phase winding 100 is switched to a delta connection. In this embodiment, the second switch group KY2 is added to realize the switching of the delta connection of the three-phase winding 100; specifically, in one embodiment, the second switch group KY2 includes a third switch, a fourth switch, and a fifth switch, The third switch is connected to the second pin M2 and the sixth pin M6, the fourth switch is connected to the third pin M3 and the fifth pin M5, and the fifth switch is connected to the first pin M1 and the fourth pin M4. , When the third switch, the fourth switch and the fifth switch are closed at the same time, and the first switch group KY1 is in the open state, the second pin M2 and the sixth pin M6 are connected to each other, and the third pin M3 and the first switch group KY1 are connected to each other. The five pins 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 triangle shape, as shown in FIGS. 5 and 6. Compared with the star connection, the delta connection allows the motor of the three-phase winding 100 to work at a higher voltage and is suitable for higher operating frequencies. Since the second switch KY2 is added, the opening and closing of the first switch KY1 is also related to the opening and closing state of the second switch KY2, so the switching of the connection mode of the three-phase winding 100 is performed as follows:

The first switch group KY1 is closed, the second switch group KY2 is disconnected, and the three-phase winding 100 is switched to star connection;

The first switch group KY1 is opened, the second switch group KY2 is closed, and the three-phase winding 100 is switched to a delta connection;

The first switch group KY1 is disconnected, the second switch group KY2 is disconnected, and the three-phase winding 100 is switched to the open winding connection.

It is understandable that the second switch group KY2 is also a switch. In the selection, you can refer to the selection of the first switch group KY1. According to the response requirements of the motor drive control circuit, different switch forms are selected to adapt to the three-phase winding 100 Switching requirements of the connection method.

In an embodiment, the second power module PM2 is connected to the output terminal of the step-down switch circuit 300 or the output terminal of the totem pole PFC circuit 200. One of the implementations of this embodiment is that the power supply of the second power module PM2 comes from the output of the totem pole PFC circuit 200. Referring to FIG. 1, the second power module PM2 continuously obtains high voltage drive, which is not conducive to the low and medium frequency of the motor. Therefore, this connection mode needs to be combined with the above-mentioned first switch group KY1, or a combination of the first switch group KY1 and the second switch group KY2, so as to short-circuit the second power module PM2 during low-frequency operation; this embodiment In another implementation of the example, the power supply of the second power module PM2 comes from the output of the step-down switch circuit 300. Referring to FIG. 9, then the first power module PM1 and the second power module PM2 both receive the same voltage value. Make the open-winding connected motor work at low, medium and high frequency. If the above-mentioned first switch group KY1 and second switch group KY2 are combined, the second power module PM2 can be connected only in the high-frequency working state of the motor. The voltage switch circuit 300 performs a filtered output, and the second power module PM2 can still be driven by a high voltage to adapt to the high frequency working state of the motor.

It should be noted that in the above-mentioned embodiment based on the open-winding connection switching connection mode, the second power module PM2 is exclusively used for open-winding connection and is suitable for high-frequency operation, while the first power module PM1 can be suitable for low-, medium-, and high-frequency operation. Therefore, in the selection, the second power module PM2 can be selected only for high-voltage driving devices, to obtain higher operating efficiency, while also saving device costs.

Referring to FIG. 10, FIG. 10 is a schematic diagram of a control device 1000 provided by an embodiment of the present disclosure. The motor drive control circuit of the first aspect of the above embodiment may be provided with the control device 1000, or it may be based on a motor drive control of another circuit structure. The circuit setting control device 1000, specifically, the control device 1000 is connected to the totem pole PFC circuit and the step-down switch circuit to realize the control of the totem pole PFC circuit and the step-down switch circuit. It can be understood that the control device 1000 includes a control processor 1001 and a memory 1002. In FIG. 10, a control processor 1001 and a memory 1002 are taken as an example.

The control processor 1001 and the memory 1002 may be connected through a bus or in other ways. In FIG. 10, the connection through a bus is taken as an example.

The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1002 may include a high-speed random access memory 1002, and may also include a non-transitory memory 1002, such as at least one disk storage 1002, a flash memory device, or other non-transitory solid-state memory 1002 pieces. In some embodiments, the memory 1002 includes a memory 1002 remotely provided with respect to the control processor 1001, and these remote memories 1002 may be connected to the control device 1000 via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

Those skilled in the art can understand that the device structure shown in FIG. 10 does not constitute a limitation on the control device 1000, and may include more or less components than shown, or a combination of certain components, or different component arrangements.

In the motor drive control circuit shown in FIG. 1, the control processor 1001 can be used to call a driver program stored in the memory 1002 to implement a driving method for the motor drive control circuit.

Based on a motor drive control circuit, various embodiments of the drive method of the second aspect of the embodiments of the present disclosure are proposed.

11, FIG. 11 is a flowchart of the driving method provided in the second aspect of an embodiment of the present disclosure, wherein the driving method is used to drive an open-winding motor having a three-phase winding 100, and one end of each phase winding forms the first three-phase The lead wire group 110, the other end of each phase winding forms the second three-phase lead wire group 120, which is characterized in that the motor drive control circuit includes:

The totem pole PFC circuit 200 is used to achieve at least one of the following states:

The step-down switch circuit 300, the totem pole PFC circuit 200, the step-down switch circuit 300 and the three-phase winding 100 are connected in sequence;

Driving methods include:

S1100, according to the load of the open-winding motor, control the first switch group KY1 to close to switch the three-phase winding 100 to star connection, control the totem pole PFC circuit 200 to enter the diode rectification state or low-frequency switching state, and control the step-down switch circuit 300 Perform step-down output.

Referring to FIG. 12, the driving method further includes:

In S1200, according to the load of the open-winding motor, control the totem pole PFC circuit 200 to enter a high-frequency switching state, and control the step-down switch circuit 300 to perform a filtered output.

The object to which the above driving method is applied is based on the motor drive control circuit of the second aspect of the embodiments of the present disclosure. Since the motor drive control circuit of the first aspect of the embodiments of the present disclosure has already described the circuit structure in detail, in order to avoid repetition, the following Taking the motor drive control circuit of the first aspect of the embodiments of the present disclosure as an example, the driving method will be described in detail. It is understandable that this does not limit that the driving method of the second aspect of the embodiments of the present disclosure can only be applied to the first aspect. Motor drive control circuit.

Taking the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 as an example for description, the first rectifying component T1, the second rectifying component T2, the third rectifying component T3 and The fourth rectifying components T4 are all attached with anti-parallel diodes, wherein, referring to FIG. 13, in step S1100, controlling the totem pole PFC circuit 200 to enter the diode rectification state, including:

S1300, continuously turning off the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4.

Since the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 are all attached with anti-parallel diodes, the first rectifying component T1, the second rectifying component T2, and the third rectifying component When both T3 and the fourth rectifying component T4 are turned off, the circuit is equivalent to a bridge circuit composed of four diodes. At this time, the totem pole PFC circuit 200 enters the diode rectification state, and only rectifies the output through the diodes.

Referring to FIG. 14, in step S1100, controlling the totem pole PFC circuit 200 to enter the low-frequency switching state includes:

S1410: During the positive half cycle of the AC input, the fourth rectifying component T4 is continuously turned on, and the second rectifying component T2 and the third rectifying component T3 are continuously turned off, and during the time period when a current flows through the first rectifying component T1 , The first rectifying component T1 is turned on;

S1420: During the negative half cycle of the AC input, the third rectifying component T3 is continuously turned on, and the first rectifying component T1 and the fourth rectifying component T4 are continuously turned off, and during the time period when a current flows through the second rectifying component T2 , The second rectifying component T2 is turned on.

Since the first rectifying component T1, the second rectifying component T2, the third rectifying component T3, and the fourth rectifying component T4 are switched on and off only once in the alternating current cycle, they belong to the low-frequency switching state, and this working state is also called the synchronous rectification state , Use the lower conduction loss of the MOSFET to replace the conduction loss of the diode, so as to adapt to the situation where the current is slightly larger.

Referring to FIG. 15, in step S1200, controlling the totem pole PFC circuit 200 to enter the high-frequency switch state, including:

S1510: During the positive half cycle of the AC input, the first rectifying component T1 is switched on and off by high frequency, the fourth rectifying component T4 is continuously turned on, and the second rectifying component T2 and the third rectifying component T3 are continuously turned off;

S1520: During the negative half cycle of the AC input, the second rectifying component T2 is switched on and off with high frequency, the third rectifying component T3 is continuously turned on, and the first rectifying component T1 and the fourth rectifying component T4 are continuously turned off.

The first rectifying component T1 and the fourth rectifying component T4 form a current path in the positive half cycle, and the first rectifying component T1 is switched on and off at high frequency to form a chopper output. The second rectifying component T2 and the third rectifying component T3 are in the negative half cycle. A current path is formed in the cycle, and the second rectifying component T2 is opened and closed at high frequency to form a chopping output, thereby improving the voltage and current output of the totem pole PFC circuit, and adapting to the high frequency operation of the motor.

Taking the step-down switching circuit 300 including a fifth switching device Q5, a sixth freewheeling device Q6, a second inductor L2, and a second capacitor C2 as an example, a step-down output and a filtered output can be implemented. Referring to FIG. 16, in step S1100, controlling the step-down switch circuit 300 to perform step-down output includes:

S1610, controlling the high-frequency switching of the fifth switching device Q5;

S1620, in the on state of the fifth switching device Q5, control the sixth freewheeling device Q6 to turn off, and in the off state of the fifth switching device Q5, control the sixth freewheeling device Q6 to turn on or off.

Since the fifth switching device Q5 is switched on and off at a high frequency, the step-down switch circuit 300 is equivalent to a buck circuit and achieves a step-down output. The sixth freewheeling device Q6 plays a role of freewheeling in the buck circuit, so the sixth freewheeling device Q6 can be a controllable switch tube or an uncontrollable diode.

Referring to FIG. 17, in step S1200, controlling the step-down switch circuit 300 to perform filtering output includes:

S1710, controlling the fifth switching device Q5 to continuously turn on, and controlling the sixth freewheeling device Q6 to continuously turn off.

At this time, the step-down switch circuit 300 is equivalent to an LC filter circuit, and the output of the totem pole PFC circuit 200 is directly input to the first power module PM1 after being filtered by the LC, so it is suitable for the high frequency operation of the motor.

According to the short-circuit switch KY3 involved in the embodiment of the first aspect of the present disclosure, the step-down chopper circuit can be directly short-circuited by closing the short-circuit switch KY3, which is equivalent to that the step-down switch circuit 300 enters the direct output mode. The filter output mode of the voltage switch circuit 300 is similar, in which the output of the totem pole PFC circuit 200 is output to the first power module PM1 without voltage reduction processing. Therefore, the content of the filter output of the voltage switch circuit 300 is mentioned below. In fact, the direct output mode can be directly applied, so I won’t repeat it here.

In order to switch the connection mode of the three-phase winding 100 in the motor drive control circuit of the embodiment of the first aspect of the present disclosure, a first switch group KY1 and a second switch group KY2 are provided. Based on this structure, referring to FIG. 18, according to the operating power parameters of the open-winding motor, the totem pole PFC circuit 200, the step-down switch circuit 300, the first switch group KY1 and the second switch group KY2 are controlled to achieve at least one of the following states:

The operating power parameter of the open-winding motor is less than the first operating power parameter. The first switch group KY1 is controlled to be closed and the second switch group KY2 is opened to switch the three-phase winding 100 into a star connection, and the totem pole PFC circuit 200 is controlled to enter the diode In the rectification state, the step-down switch circuit 300 is controlled to perform step-down output;

The operating power parameter of the open-winding motor is greater than the first operating power parameter and less than the second power operating parameter, control the first switch group KY1 to close and the second switch group KY2 to open so that the three-phase winding 100 is switched into star connection, and control The totem pole PFC circuit 200 enters the low-frequency switching state, and controls the step-down switch circuit 300 to perform step-down output;

The operating power parameter of the open-winding motor is greater than the second operating power parameter and less than the third power operating parameter, control the first switch group KY1 to close and the second switch group KY2 to open so that the three-phase winding 100 is switched into star connection, and control The totem pole PFC circuit 200 enters the high-frequency switch state, and controls the step-down switch circuit 300 to filter output;

The operating power parameter of the open-winding motor is greater than the third operating power parameter and less than the fourth power operating parameter, controlling the first switch group KY1 to open and the second switch group KY2 to close so that the three-phase winding 100 is switched into a delta connection, and the totem is controlled The column PFC circuit 200 enters the high-frequency switch state, and controls the step-down switch circuit 300 to filter output;

The operating power parameter of the open winding motor is greater than the fourth power operating parameter. The first switch group KY1 is disconnected and the second switch group KY2 is disconnected so that the three-phase winding 100 is switched to the open winding connection, and the totem pole PFC circuit 200 is controlled to enter high The frequency switch state is controlled to control the step-down switch circuit 300 to perform a filtered output.

The parameters corresponding to the first operating power parameter, the second operating power parameter, the third operating power parameter, and the fourth operating power parameter are related to the working condition of the motor. For example, the parameter can be the current of the motor or the operating frequency of the motor. It can also be the operating power of the motor. It is understandable that under the same working condition of an open-winding motor, the current of the motor, the operating frequency of the motor and the operating power of the motor are positively correlated. In an embodiment, the parameter values corresponding to the first operating power parameter, the second operating power parameter, the third operating power parameter, and the fourth operating power parameter can be set to increase sequentially, as shown in FIG. 18.

A third aspect of an embodiment of the present disclosure provides a circuit board, including the motor drive control circuit of the first aspect of the embodiment, and the motor drive control circuit of the first aspect is carried by the circuit board, which can be easily installed in a variable frequency motor In order to realize drive control, based on the open-winding motor, by controlling the switching of the first switch group KY1, the switching of the working state of the totem PFC circuit 200, and the switching of the working state of the step-down switch circuit 300, it can correspond to a variety of open-winding motors. The load realizes different driving modes, for example, when the open-winding motor works at low frequency, the connection mode of the three-phase windings is switched to star connection by closing the first switch group KY1, and the totem pole PFC circuit 200 is controlled to work in the diode rectification state at the same time Or low-frequency switching state, the step-down switch circuit 300 is controlled to work in the step-down output state, so that the access loss of the second power module PM2 can be avoided, and the first power module PM1 can also get a lower power supply voltage, thereby reducing The inverter conversion loss in the first power module PM1 enables the open-winding motor to obtain a higher energy efficiency ratio under low-frequency operation and meet the energy-saving requirements.

A fourth aspect of an embodiment of the present disclosure provides an air conditioner, including the circuit board of the above third aspect. The above-mentioned circuit board of the second aspect is installed in the air conditioner to drive the compressor of the air conditioner to work and realize the inverter control of the air conditioner. Therefore, on the basis of the air conditioner motor being an open winding motor, by controlling the first switch group KY1 The switching, the switching of the working state of the totem PFC circuit 200 and the switching of the working state of the step-down switch circuit 300 can realize different driving modes corresponding to various loads of the open-winding motor. For example, when the open-winding motor works at low frequency, by closing the first A switch group KY1 switches the connection mode of the three-phase windings to star connection, and at the same time controls the totem pole PFC circuit 200 to work in the diode rectification state or low-frequency switching state, and controls the step-down switch circuit 300 to work in the step-down output state, so that you can Avoid the access loss of the second power module PM2, and the first power module PM1 can also get a lower power supply voltage, thereby reducing the inverter conversion loss in the first power module PM1, making the open-winding motor run at low frequency To achieve a higher energy efficiency ratio and meet energy-saving needs.

Since the air conditioner in this embodiment has the control device 1000 in any of the above embodiments, the air conditioner in this embodiment has the hardware structure of the control device 1000 in the above embodiment, and enables the control processor in the control device 1000 to 1001 calls the control program of the air conditioner stored in the memory 1002 to implement the driving method of the second aspect of the embodiment of the present disclosure.

In addition, an embodiment of the present disclosure also provides a computer-readable storage medium that stores computer-executable instructions, and the computer-executable instructions are executed by one or more control processors 1001, for example, When executed by one control processor 1001 in FIG. 10, the above-mentioned one or more control processors 1001 may execute the refrigeration method of the refrigeration device in the above-mentioned method embodiment, for example, execute the above-described method steps S1100 and S1100 in FIG. 11 The method step S1200 in FIG. 12, the method step S1300 in FIG. 13, the method steps S1410 to S1420 in FIG. 14, the method steps S1510 to S1520 in FIG. 15, the method steps S1610 to S1620 in FIG. 16, and the method steps in FIG. Method step S1710.

The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

A person of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile data implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Sexual, removable and non-removable media. Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or Any other medium used to store desired information and that can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media. .

The above is a detailed description of the preferred implementation of the present disclosure, but the present disclosure is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present disclosure. Equivalent modifications or replacements are all included in the scope defined by the claims of the present disclosure.

Claims

The motor drive control circuit is used to drive an open-winding motor with three-phase windings. One end of the winding of each phase forms a first three-phase lead-out wire group, and the other end of the winding of each phase forms a second three-phase lead-out wire group, It is characterized in that the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The first switch group is connected to the second three-phase lead-out wire group, and is used to switch the three-phase winding between star connection and open winding connection;

A controller, respectively connected to the first power module, the second power module, and the first switch group;

A totem pole PFC circuit, the controller is connected to the totem pole PFC circuit to control the totem pole PFC circuit to achieve at least one of the following states:

Diode rectification state, low-frequency switching state and high-frequency switching state;

A step-down switch circuit, the totem pole PFC circuit, the step-down switch circuit, and the three-phase winding are sequentially connected, and the controller is connected to the step-down switch circuit to control the output voltage of the step-down switch circuit.
The motor drive control circuit according to claim 1, wherein the totem pole PFC circuit further comprises a first inductor, a first capacitor, and a bridge circuit, and an AC input terminal, the first inductor, and the bridge circuit The circuit is connected to the first capacitor in sequence, and the controller is connected to the bridge circuit.
The motor drive control circuit according to claim 2, wherein the bridge circuit includes a first bridge arm unit and a second bridge arm unit, and the first bridge arm unit includes a first rectifying component connected in series in the same direction And a second rectifying part, the second bridge arm unit includes a third rectifying part and a fourth rectifying part connected in series in the same direction, and the first capacitor is connected to the output terminal of the bridge circuit and is connected to the first bridge arm The units are connected in parallel, and the first rectifying component, the second rectifying component, the third rectifying component, and the fourth rectifying component are respectively connected to the controller.
The motor drive control circuit according to claim 3, wherein the first rectifying component, the second rectifying component, the third rectifying component, and the fourth rectifying component are semiconductor switching devices, and the The first rectifying component, the second rectifying component, the third rectifying component and the fourth rectifying component are all provided with anti-parallel diodes.
The motor drive control circuit according to claim 1, wherein the step-down switching circuit includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth switching device, a sixth freewheeling device, and a second An inductor and a second capacitor, the output end of the totem pole PFC circuit, the fifth switching device, the sixth freewheeling device and the reference ground are connected in sequence, the fifth switching device and the sixth freewheeling device The connection point between the second inductor and the second capacitor and the reference ground are sequentially connected, and the connection point between the second inductor and the second capacitor is connected to the first power module.
The motor drive control circuit is used to drive an open-winding motor with three-phase windings. One end of the winding of each phase forms a first three-phase lead-out wire group, and the other end of the winding of each phase forms a second three-phase lead-out wire group, It is characterized in that the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The first switch group is connected to the second three-phase lead-out wire group, and is used to switch the three-phase winding between star connection and open winding connection;

The totem pole PFC circuit includes a first inductor, a first capacitor, and a bridge circuit, the first inductor, the bridge circuit, and the first capacitor are connected in sequence, and the bridge circuit includes a first bridge arm unit and A second bridge arm unit, the first bridge arm unit includes a first rectifying component and a second rectifying component connected in series in the same direction, and the second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, The first capacitor is connected to the output terminal of the bridge circuit and is connected in parallel with the first bridge arm unit;

A step-down switch circuit, the totem pole PFC circuit, the step-down switch circuit, and the three-phase winding are sequentially connected, the step-down switch circuit includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth The switching device, the sixth freewheeling device, the second inductor and the second capacitor, the output end of the totem pole PFC circuit, the fifth switching device, the sixth freewheeling device and the reference ground are connected in sequence, and the first Five connection points between the switching device and the sixth freewheeling device, the second inductor and the second capacitor are connected to the reference ground in sequence, and the connection point between the second inductor and the second capacitor Connect the first power module.
The motor drive control circuit according to claim 1 or 6, further comprising a second switch group, the second switch group is connected to the first three-phase lead group and the second three-phase lead group respectively The wire group is connected, the first switch group is opened, the second switch group is closed, and the three-phase winding is switched to a delta connection.
The motor drive control circuit according to claim 5 or 6, wherein the step-down switch circuit further comprises a short-circuit switch, and the short-circuit switch is connected in parallel with the step-down chopper circuit.
The motor drive control circuit is used to drive an open-winding motor with three-phase windings. One end of the winding of each phase forms a first three-phase lead-out wire group, and the other end of the winding of each phase forms a second three-phase lead-out wire group, It is characterized in that the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The first switch group is connected to the second three-phase lead-out wire group, and is used to switch the three-phase winding between star connection and open winding connection;

The totem pole PFC circuit is used to achieve at least one of the following states according to the load of the open-winding motor:

Diode rectification state, low-frequency switching state and high-frequency switching state;

The step-down switch circuit is used to enter different voltage output states according to the load of the open-winding motor, and the totem pole PFC circuit, the step-down switch circuit and the three-phase winding are connected in sequence.
The motor drive control circuit according to claim 9, wherein the totem pole PFC circuit further comprises a first inductor, a first capacitor, and a bridge circuit, an AC input terminal, the first inductor, and the bridge circuit The circuit and the first capacitor are connected in sequence.
The motor drive control circuit according to claim 10, wherein the bridge circuit includes a first bridge arm unit and a second bridge arm unit, and the first bridge arm unit includes a first rectifying component connected in series in the same direction And a second rectifying part, the second bridge arm unit includes a third rectifying part and a fourth rectifying part connected in series in the same direction, and the first capacitor is connected to the output terminal of the bridge circuit and is connected to the first bridge arm Units are connected in parallel.
The motor drive control circuit according to claim 11, wherein the first rectifying component, the second rectifying component, the third rectifying component, and the fourth rectifying component are semiconductor switching devices, and the The first rectifying component, the second rectifying component, the third rectifying component and the fourth rectifying component are all provided with anti-parallel diodes.
The motor drive control circuit according to claim 11, wherein the first rectifying component and the second rectifying component are semiconductor switching devices, and the third rectifying component and the fourth rectifying component are diodes, The first rectifying component and the second rectifying component are provided with anti-parallel diodes.
The motor drive control circuit according to claim 9, wherein the step-down switching circuit includes a step-down chopper circuit, and the step-down chopper circuit includes a fifth switching device, a sixth freewheeling device, and a second The inductor and the second capacitor, the output terminal of the PFC circuit, the fifth switching device, the sixth freewheeling device and the reference ground are connected in sequence, and the fifth switching device and the sixth freewheeling device are connected in sequence. The connection point of the second inductor and the second capacitor are sequentially connected to the reference ground, and the connection point between the second inductor and the second capacitor is connected to the first power module.
The motor drive control circuit according to claim 14, wherein the fifth switching device is provided with an anti-parallel diode.
The motor drive control circuit according to claim 14, wherein the step-down switch circuit further comprises a short-circuit switch, and the short-circuit switch is connected in parallel with the step-down chopper circuit.
The motor drive control circuit according to any one of claims 9 to 16, further comprising a second switch group, and the second switch group is respectively connected to the first three-phase lead-out wire group and the second switch group. The three-phase lead wire group is connected, the first switch group is opened, the second switch group is closed, and the three-phase winding is switched to a delta connection.
The motor drive control circuit according to claim 9, wherein the second power module is connected to the output terminal of the step-down switch circuit or the output terminal of the totem pole PFC circuit.
A driving method for driving an open-winding motor with three-phase windings, one end of the winding of each phase forms a first three-phase lead-out wire group, and the other end of the winding of each phase forms a second three-phase lead-out wire group, It is characterized in that the motor drive control circuit includes:

The first power module is connected to the first three-phase lead wire group;

The second power module is connected to the second three-phase lead wire group;

The first switch group is connected to the second three-phase lead-out wire group, and is used to switch the three-phase winding between star connection and open winding connection;

Totem pole PFC circuit, used to achieve at least one of the following states:

Diode rectification state, low-frequency switching state and high-frequency switching state;

A step-down switch circuit, the totem pole PFC circuit, the step-down switch circuit and the three-phase winding are connected in sequence;

The driving method includes:

According to the load of the open-winding motor, the first switch group is controlled to close so that the three-phase winding is switched to star connection, the totem pole PFC circuit is controlled to enter the diode rectification state or the low-frequency switching state, and the control The step-down switch circuit performs step-down output.
The driving method according to claim 19, wherein the totem pole PFC circuit further comprises a bridge circuit, the bridge circuit comprises a first bridge arm unit and a second bridge arm unit, and the first bridge arm The unit includes a first rectifying component and a second rectifying component connected in series in the same direction, the second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, and the first capacitor is connected to the bridge circuit. The output terminal is connected in parallel with the first bridge arm unit;

The controlling the totem pole PFC circuit to enter a diode rectification state includes:

The first rectifying component, the second rectifying component, the third rectifying component and the fourth rectifying component are continuously turned off.
The driving method according to claim 19, wherein the totem pole PFC circuit further comprises a bridge circuit, the bridge circuit comprises a first bridge arm unit and a second bridge arm unit, and the first bridge arm The unit includes a first rectifying component and a second rectifying component connected in series in the same direction, the second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, and the first capacitor is connected to the bridge circuit. The output terminal is connected in parallel with the first bridge arm unit;

The controlling the totem pole PFC circuit to enter a low-frequency switch state includes:

During the positive half cycle of the AC input, the fourth rectifying component is continuously turned on, the second rectifying component and the third rectifying component are continuously turned off, and when a current flows through the first rectifying component In the segment, the first rectifying component is turned on;

During the negative half cycle of the AC input, the third rectifying component is continuously turned on, the first rectifying component and the fourth rectifying component are continuously turned off, and when a current flows through the second rectifying component In the segment, the second rectifying component is turned on.
The driving method according to claim 19, wherein the driving method further comprises:

According to the load of the open-winding motor, the totem pole PFC circuit is controlled to enter a high-frequency switching state, and the step-down switch circuit is controlled to perform a filtered output.
The driving method of claim 22, wherein the totem pole PFC circuit further comprises a bridge circuit, the bridge circuit comprises a first bridge arm unit and a second bridge arm unit, and the first bridge arm The unit includes a first rectifying component and a second rectifying component connected in series in the same direction, the second bridge arm unit includes a third rectifying component and a fourth rectifying component connected in series in the same direction, and the first capacitor is connected to the bridge circuit. The output terminal is connected in parallel with the first bridge arm unit;

The controlling the totem pole PFC circuit to enter a high frequency switch state includes:

During the positive half cycle of the AC input, the first rectifying component is switched on and off by high frequency, the fourth rectifying component is continuously turned on, and the second rectifying component and the third rectifying component are continuously turned off;

In the negative half cycle of the AC input, the second rectifying component is switched on and off by high frequency, the third rectifying component is continuously turned on, and the first rectifying component and the fourth rectifying component are continuously turned off.
The driving method according to claim 19, wherein the step-down switching circuit comprises a step-down chopper circuit, and the step-down chopper circuit includes a fifth switching device, a sixth freewheeling device, a second inductor, and The second capacitor, the output terminal of the totem pole PFC circuit, the fifth switch device, the sixth freewheeling device and the reference ground are connected in sequence, and the fifth switch device and the sixth freewheeling device are connected in sequence. The connection point of the second inductor and the second capacitor are sequentially connected to a reference ground, and the connection point between the second inductor and the second capacitor is connected to the first power module;

The controlling the step-down switch circuit to perform step-down output includes:

Controlling the high-frequency switching of the fifth switching device;

In the on state of the fifth switching device, control the sixth freewheeling device to turn off, and in the off state of the fifth switching device, control the sixth freewheeling device to turn on or off .
The driving method according to claim 24, wherein the driving method further comprises:

According to the load of the open-winding motor, controlling the totem pole PFC circuit to enter a high-frequency switching state, and controlling the step-down switching circuit to perform filtered output;

The controlling the step-down switch circuit to perform filtering output includes:

The fifth switching device is controlled to be continuously turned on, and the sixth freewheeling device is controlled to be continuously turned off.
The driving method according to claim 24, wherein the step-down switch circuit further comprises a short-circuit switch, and the short-circuit switch is connected in parallel with the step-down chopper circuit;

The driving method further includes: controlling the totem pole PFC circuit to enter a high-frequency switching state according to the load of the open-winding motor, and controlling the short-circuit switch to close.
The driving method according to any one of claims 19 to 26, wherein the motor drive control circuit further comprises a second switch group, and the second switch group is respectively connected to the first three-phase lead-out wire group and The second three-phase lead wire group is connected, the first switch group is opened, the second switch group is closed, and the three-phase winding is switched to a delta connection;

The driving method further includes:

According to the load of the open-winding motor, control the first switch group to open and the second switch group to close, so that the three-phase winding is switched to delta connection, and the totem pole PFC circuit is controlled to enter the high-frequency switching state , And control the step-down switch circuit to filter output.
The driving method according to claim 27, wherein the load of the open-winding motor is an operating power parameter of the open-winding motor, and the driving method comprises:

According to the operating power parameters of the open-winding motor, control the totem pole PFC circuit, the step-down switch circuit, the first switch group, and the second switch group to achieve at least one of the following states:

The operating power parameter of the open-winding motor is less than the first operating power parameter, the first switch group is controlled to be closed and the second switch group is opened to switch the stator windings into star connection, and the totem is controlled The column PFC circuit enters the diode rectification state, and controls the step-down switch circuit to perform step-down output;

The operating power parameter of the open-winding motor is greater than the first operating power parameter and less than the second power operating parameter, and the first switch group is controlled to be closed and the second switch group is opened to switch the stator winding to Star connection, and controlling the totem pole PFC circuit to enter a low-frequency switching state, and controlling the step-down switch circuit to perform a step-down output;

The operating power parameter of the open-winding motor is greater than the second operating power parameter and less than the third power operating parameter, and the first switch group is controlled to be closed and the second switch group is opened to switch the stator winding to Star connection, and controlling the totem pole PFC circuit to enter a high-frequency switching state, and controlling the step-down switch circuit to filter output;

The operating power parameter of the open-winding motor is greater than the third operating power parameter and less than the fourth power operating parameter, and the first switch group is controlled to be opened and the second switch group is closed so that the stator winding is switched to Delta connection, and controlling the totem pole PFC circuit to enter a high-frequency switching state, and controlling the step-down switch circuit to perform filtered output;

The operating power parameter of the open-winding motor is greater than the fourth power operating parameter, the first switch group is controlled to be disconnected and the second switch group is disconnected so that the stator winding is switched to the open winding connection, and the control The totem pole PFC circuit enters a high-frequency switch state, and controls the step-down switch circuit to perform filtered output.
The circuit board is characterized by comprising the motor drive control circuit according to any one of claims 1 to 18.
An air conditioner, characterized by comprising the circuit board according to claim 29;

or,

It includes at least one processor and a memory for communicating with the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to The at least one processor is enabled to execute the driving method according to any one of claims 19 to 28.
A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make a computer execute the drive according to any one of claims 19 to 28 method.