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

Abstract

The embodiment of the application discloses a driving control circuit, a driving control method, a circuit board and an air conditioner, wherein the driving control circuit is connected with the first power module and the second power module at both ends of the open-winding motor, the second power module is connected with the energy storage module, the controller is used for sending the control signal to the first power module and the second power module according to the electric quantity of the energy storage module to change the working state of the driving control circuit, so that the electric energy can flow bidirectionally when the motor operates, the energy storage module can supply power to the open-winding motor under the condition that the energy is sufficient, the operating voltage of the motor is improved, and the operating efficiency of the motor is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a drive control circuit, drive control method, circuit board, and air conditioner. Background Technology

[0002] Air conditioners are common household appliances, and the compressor is a crucial component, accounting for a significant proportion of the total energy consumption. Therefore, improving compressor efficiency has a substantial effect on enhancing the overall energy efficiency of the air conditioner. The compressor's drive motor is typically a permanent magnet synchronous motor. Since the power supply voltage is generally fixed and limited by the DC bus voltage, the compressor is prone to voltage saturation under high load conditions, prematurely entering field weakening control and causing a decrease in motor operating efficiency. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This invention provides a drive control circuit, a drive control method, a circuit board, and an air conditioner, which can improve the operating efficiency of the motor.

[0005] In a first aspect, embodiments of the present invention provide a drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of each phase winding forms a first three-phase output group, and the other end of each phase winding forms a second three-phase output group, the drive control circuit comprising:

[0006] The first power module includes a first input terminal and a first output terminal, wherein the first output terminal is connected to the first three-phase output group;

[0007] The second power module includes a second input terminal and a second output terminal, wherein the second output terminal is connected to the second three-phase output group;

[0008] A power connection terminal is used to connect to a power source, and the power connection terminal is connected to the first input terminal.

[0009] The energy storage module is connected to the second input terminal;

[0010] A controller is used to send control signals to the first power module and the second power module according to the power of the energy storage module to change the operating state of the drive control circuit. The controller is connected to the first power module and the second power module respectively.

[0011] The drive control circuit provided in this embodiment of the invention has at least the following beneficial effects: by connecting a first power module and a second power module to both ends of the open-winding motor, and the second power module being connected to an energy storage module, the controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running, and the energy storage module can supply power to the open-winding motor when the energy is sufficient, thereby increasing the operating voltage of the motor and improving the operating efficiency of the motor.

[0012] In some embodiments of the present invention, the drive control circuit further includes:

[0013] A switch module is connected between the first input terminal and the power connection terminal.

[0014] In the above technical solution, by setting a switch module, the connection between the power supply terminal and the first power module can be controlled. When the energy storage module supplies power to the open winding motor, the open winding motor can operate independently in isolation from the power supply, which helps to reduce the control loss of the open winding motor.

[0015] In some embodiments of the present invention, the switch module includes a first switch, the power connection terminal includes a positive bus connection terminal and a negative bus connection terminal, the first input terminal includes a positive bus input terminal and a negative bus input terminal, the first switch is connected between the positive bus connection terminal and the positive bus input terminal, and the negative bus connection terminal is connected to the negative bus input terminal;

[0016] or,

[0017] The switch module includes a first switch and a second switch. The power connection terminal includes a positive bus connection terminal and a negative bus connection terminal. The first input terminal includes a positive bus input terminal and a negative bus input terminal. The first switch is connected between the positive bus connection terminal and the positive bus input terminal. The second switch is connected between the negative bus connection terminal and the negative bus input terminal.

[0018] In the above technical solution, the switch module can be a single-pole single-throw switch or a double-pole double-throw switch, which has the advantages of simple structure and low cost.

[0019] In some embodiments of the present invention, the drive control circuit further includes:

[0020] A capacitor is connected in parallel between the power supply connection terminal and the first power module.

[0021] In the above technical solution, by setting up capacitor components, the electrical energy of the power supply can be stored, and the signal at the power connection terminal can be filtered, making the operation of the open winding motor more stable.

[0022] Secondly, embodiments of the present invention also provide a drive control method applied to a drive control circuit. The drive control circuit is used to drive an open-winding motor with three-phase windings. One end of each phase winding forms a first three-phase output group, and the other end of each phase winding forms a second three-phase output group. The drive control circuit includes a first power module, a second power module, a power connection terminal, an energy storage module, and a controller. The first power module includes a first input terminal and a first output terminal. The first output terminal is connected to the first three-phase output group. The second power module includes a second input terminal and a second output terminal. The second output terminal is connected to the second three-phase output group. The power connection terminal is connected to the first input terminal. The energy storage module is connected to the second input terminal. The controller is connected to both the first power module and the second power module.

[0023] The drive control method includes:

[0024] Obtain the power of the energy storage module;

[0025] Based on the power level, control signals are sent to the first power module and the second power module to change the operating state of the drive control circuit.

[0026] The drive control method provided in this embodiment of the invention has at least the following beneficial effects: by acquiring the power of the energy storage module, the controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running, and the energy storage module can supply power to the open winding motor when the energy is sufficient, thereby increasing the operating voltage of the motor and improving the operating efficiency of the motor.

[0027] In some embodiments of the present invention, the step of sending control signals to the first power module and the second power module according to the power quantity to change the operating state of the drive control circuit includes:

[0028] When the power level exceeds a preset power threshold, a control signal is sent to the first power module and the second power module to put the drive control circuit into a non-dual-ended power supply state.

[0029] In the above technical solution, when the power of the energy storage module is greater than the preset power threshold, it indicates that the energy storage module has sufficient power. At this time, control signals can be sent to the first power module and the second power module to make the drive control circuit in a non-dual-ended power supply state. The energy storage module can be used to supply power to the open winding motor, or the energy storage module can be not used to supply power to the open winding motor.

[0030] In some embodiments of the present invention, both the first power module and the second power module include three parallel bridge arms, each bridge arm including two series-connected switching transistors, and sending control signals to the first power module and the second power module to put the drive control circuit in a non-dual-ended power supply state includes at least one of the following:

[0031] PWM pulse signals are sent to the six switching transistors of the first power module respectively to turn on the switching transistors of the upper half-bridge of the second power module or to turn on the switching transistors of the lower half-bridge of the second power module.

[0032] PWM pulse signals are sent to the six switching transistors of the second power module respectively, turning on the switching transistors of the upper half-bridge of the first power module or turning on the switching transistors of the lower half-bridge of the first power module.

[0033] In the above technical solution, PWM pulse signals are sent to the six switching transistors of the first power module to turn on the switching transistors of the upper half-bridge or the lower half-bridge of the second power module. At this time, the energy storage module is not used to supply power to the open-winding motor, and the open-winding motor operates in a star connection. Similarly, PWM pulse signals are sent to the six switching transistors of the second power module to turn on the switching transistors of the upper half-bridge or the lower half-bridge of the first power module. At this time, the energy storage module supplies power to the open-winding motor, and the open-winding motor operates in a star connection.

[0034] In some embodiments of the present invention, the step of sending control signals to the first power module and the second power module according to the power quantity to change the operating state of the drive control circuit further includes:

[0035] When the power level is less than or equal to the power threshold, control signals are sent to the first power module and the second power module according to the load parameters of the open-winding motor to change the working state of the drive control circuit.

[0036] In the above technical solution, when the power is less than or equal to the power threshold, it indicates that the energy storage module is low on power. At this time, control signals are sent to the first power module and the second power module according to the load parameters of the open-winding motor to change the working state of the drive control circuit. That is, it is determined whether the energy storage module needs to be charged according to the load parameters of the open-winding motor.

[0037] In some embodiments of the present invention, the load parameter includes the required speed of the open-winding motor, and the step of sending control signals to the first power module and the second power module to change the operating state of the drive control circuit according to the load parameter of the open-winding motor includes at least one of the following:

[0038] When the required speed of the open-winding motor is less than or equal to a preset speed threshold, PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively.

[0039] When the required speed of the open-winding motor is greater than the preset speed threshold, PWM pulse signals are sent to the six switching transistors of the first power module to turn on the switching transistors of the upper half-bridge of the second power module or the switching transistors of the lower half-bridge of the second power module.

[0040] In the above technical solution, when the required speed of the open-winding motor is less than or equal to a preset speed threshold, it indicates that the required speed of the open-winding motor is low. At this time, PWM pulse signals can be sent to the six switching transistors of the first power module and the second power module respectively, so that the power supply can charge the energy storage module, and the open-winding motor operates in open-winding connection. When the required speed of the open-winding motor is greater than the preset speed threshold, it indicates that the required speed of the open-winding motor is high. At this time, PWM pulse signals can be sent to the six switching transistors of the first power module respectively, turning on the switching transistors of the upper half bridge of the second power module or turning on the switching transistors of the lower half bridge of the second power module. At this time, the power supply does not charge the energy storage module, and the open-winding motor operates in star connection.

[0041] In some embodiments of the present invention, the drive control circuit further includes a switching module connected between the first input terminal and the power connection terminal. The step of sending control signals to the first power module and the second power module according to the power level to change the operating state of the drive control circuit includes:

[0042] When the power level exceeds a preset power threshold, the switch module is controlled to disconnect, and control signals are sent to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor.

[0043] In the above technical solution, when the power is greater than the preset power threshold, it indicates that the energy storage module has sufficient power, and the switch module is controlled to disconnect. At this time, the energy storage module supplies power to the open winding motor alone, ensuring the normal operation of the open winding motor. Furthermore, the isolation effect of the switch module helps to reduce the control loss of the open winding motor.

[0044] In some embodiments of the present invention, both the first power module and the second power module include three parallel bridge arms, each bridge arm including two series-connected switching transistors. Sending control signals to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor includes at least one of the following:

[0045] PWM pulse signals are sent to the six switching transistors of the second power module respectively to turn on the switching transistors of the upper half-bridge of the first power module or to turn on the switching transistors of the lower half-bridge of the second power module;

[0046] PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively.

[0047] In the above technical solution, PWM pulse signals are sent to the six switching transistors of the second power module respectively to turn on the switching transistors of the upper half bridge of the first power module or the switching transistors of the lower half bridge of the second power module. At this time, the open-winding motor operates in a star connection; or PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively. At this time, the open-winding motor operates in an open-winding connection.

[0048] In some embodiments of the present invention, the step of sending control signals to the first power module and the second power module according to the power quantity to change the operating state of the drive control circuit includes:

[0049] When the power level is less than or equal to the power threshold, the switch module is controlled to close, and control signals are sent to the first power module and the second power module according to the load parameters of the open winding motor to change the working state of the drive control circuit.

[0050] In the above technical solution, when the power is less than or equal to the power threshold, it indicates that the energy storage module is low on power. At this time, the switch module is controlled to close, and it is determined whether the energy storage module needs to be charged based on the load parameters of the open winding motor.

[0051] In some embodiments of the present invention, both the first power module and the second power module include three parallel bridge arms, each bridge arm including two series-connected switching transistors; the operating states include a dual-end power supply state, an independent power supply state for the energy storage module, and an independent power supply state for the power source; the step of sending control signals to the first power module and the second power module according to the amount of power to change the operating state of the drive control circuit includes:

[0052] The time percentages of the dual-end power supply state, the independent power supply state of the energy storage module, and the independent power supply state are controlled according to the load parameters of the open-winding motor.

[0053] In the above technical solution, by controlling the time ratio of the dual-end power supply state, the independent power supply state of the energy storage module, and the independent power supply state according to the load parameters of the open-winding motor, the power supply failure phenomenon can be prevented and the reliability of the open-winding motor operation can be improved.

[0054] Thirdly, embodiments of the present invention also provide a circuit board including the drive control circuit described in the first aspect. Therefore, the circuit board connects a first power module and a second power module to both ends of the open-winding motor, and the second power module is connected to an energy storage module. The controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running. When the energy storage module has sufficient energy, it can supply power to the open-winding motor, improve the operating voltage of the motor, and improve the operating efficiency of the motor.

[0055] Fourthly, embodiments of the present invention also provide an air conditioner, including the circuit board described in the third aspect, or including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the drive control method described in the second aspect. Therefore, the air conditioner connects a first power module and a second power module to both ends of an open-winding motor, and the second power module is connected to an energy storage module. The controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running. When the energy storage module has sufficient energy, it can supply power to the open-winding motor, increase the operating voltage of the motor, and improve the operating efficiency of the motor.

[0056] Fifthly, embodiments of the present invention also provide a computer-readable storage medium storing a program that is executed by a processor to implement the drive control method described in the second aspect.

[0057] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0058] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0059] Figure 1 This is a schematic diagram of the drive control circuit provided in an embodiment of the present invention;

[0060] Figure 2 This is a schematic diagram of the structure of the first power module / second power module provided in an embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of a DC device (DC power supply) provided in an embodiment of the present invention;

[0062] Figure 4 This is another structural schematic diagram of the DC device provided in the embodiment of the present invention (DC power supply + DC-DC converter);

[0063] Figure 5 This is another structural schematic diagram of the DC device provided in the embodiment of the present invention (AC power supply + AC-DC converter);

[0064] Figure 6 This is a schematic diagram of a structure (battery) of an energy storage module provided in an embodiment of the present invention;

[0065] Figure 7 This is another structural schematic diagram (capacitor) of the energy storage module provided in the embodiment of the present invention;

[0066] Figure 8 This is another structural schematic diagram (battery + capacitor) of the energy storage module provided in the embodiment of the present invention;

[0067] Figure 9 This is another structural schematic diagram of the energy storage module provided in the embodiment of the present invention (capacitor + bridge arm + inductor + battery);

[0068] Figure 10 This is a schematic diagram showing the switching of the working state of the drive control circuit provided in an embodiment of the present invention;

[0069] Figure 11 This is a schematic diagram of the current flow direction during charging of the energy storage module provided in an embodiment of the present invention;

[0070] Figure 12 This is another structural schematic diagram of the drive control circuit provided in an embodiment of the present invention (with a switching module);

[0071] Figure 13 This is a schematic diagram of the structure of the switch module (single-pole single-throw) provided in an embodiment of the present invention;

[0072] Figure 14 This is a schematic diagram of the structure of the switch module provided in an embodiment of the present invention (another connection method for single-pole single-throw);

[0073] Figure 15 This is a schematic diagram of the structure of the switching module (double-pole double-throw) provided in an embodiment of the present invention;

[0074] Figure 16 This is a schematic diagram of another structure of the drive control circuit provided in an embodiment of the present invention (the switch module is located in another position);

[0075] Figure 17 This is a flowchart of the drive control method provided in an embodiment of the present invention;

[0076] Figure 18 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of the present invention. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0078] It should be understood that in the description of the embodiments of the present invention, "multiple" (or "amounts") means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0079] Air conditioners are common household appliances, and the compressor is a crucial component, accounting for a significant proportion of the total energy consumption. Therefore, improving compressor efficiency has a substantial effect on enhancing the overall energy efficiency of the air conditioner. The compressor's drive motor is typically a permanent magnet synchronous motor. Since the power supply voltage is generally fixed and limited by the DC bus voltage, the compressor is prone to voltage saturation under high load conditions, prematurely entering field weakening control and causing a decrease in motor operating efficiency.

[0080] Based on this, embodiments of the present invention provide a drive control circuit, a drive control method, a circuit board, and an air conditioner, which can improve the operating efficiency of the motor.

[0081] Reference Figure 1This invention provides a drive control circuit for driving an open-winding motor with three-phase windings. One end of each phase winding forms a first three-phase output group 1100, and the other end of each phase winding forms a second three-phase output group 1200. The drive control circuit includes a first power module, a second power module, a power connection terminal 1700, an energy storage module, and a controller. The first power module includes a first input terminal 1300 and a first output terminal 1400, with the first output terminal 1400 connected to the first three-phase output group 1100. The second power module includes a second input terminal 1500 and a second output terminal 1600, with the second output terminal 1600 connected to the second three-phase output group 1200. The power connection terminal 1700 is used to connect to a power source and is connected to the first input terminal 1300. The energy storage module is connected to the second input terminal 1500. The controller is used to send control signals to the first power module and the second power module according to the power level of the energy storage module to change the operating state of the drive control circuit. The controller is connected to both the first power module and the second power module.

[0082] It is understood that the power connection terminal 1700 is connected to the DC device, and both the first input terminal 1300 and the second input terminal 1500 are provided with a positive bus input terminal and a ground terminal. The first output terminal 1400 and the second output terminal 1600 are both three-phase output terminals. The positive bus and negative bus of the DC device are connected to the positive bus input terminal and the ground terminal of the first input terminal 1300, respectively. The positive bus and ground wire of the energy storage module are connected to the positive bus input terminal and the ground terminal of the second input terminal 1500, respectively. The three-phase output terminal of the first output terminal 1400 is connected to the first three-phase output group 1100 of the open-winding motor, and the three-phase output terminal of the second output terminal 1600 is connected to the second three-phase output group 1200 of the open-winding motor.

[0083] It is understood that the drive control circuit may also include a capacitor C, which is connected in parallel between the power supply connection terminal 1700 and the first power module. By setting the capacitor C, the electrical energy of the power supply can be stored, and the signal of the power supply connection terminal 1700 can be filtered, making the operation of the open winding motor more stable.

[0084] Reference Figure 2 Both the first power module and the second power module include three parallel bridge arms, each of which includes two switching transistors connected in series. The switching transistors can be MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or IGBTs (Insulated Gate Bipolar Transistors).

[0085] Reference Figures 3 to 5The DC device can be any one of the following: a DC power supply, a DC power supply + DC-DC converter, or an AC power supply + AC-DC converter. The DC power supply can be a battery or a capacitor. If the DC device is a DC power supply, the positive bus and ground wire of the DC power supply are connected to power connection terminal 1700. If the DC device is a DC power supply + DC-DC converter, the two output terminals of the DC-DC converter are connected to power connection terminal 1700, and the positive bus and ground wire of the DC power supply are connected to the two input terminals of the DC-DC converter. If the DC device is an AC power supply + AC-DC converter, the two output terminals of the AC-DC converter are connected to power connection terminal 1700, and the positive bus and negative bus of the AC power supply are connected to the two input terminals of the AC-DC converter.

[0086] Reference Figures 6 to 9 The energy storage module can be any one of the following: battery, capacitor, battery + capacitor, or capacitor + bridge arm + inductor + battery. Specifically, if the energy storage module is a battery, the positive bus and ground wire of the battery are connected to the positive bus input terminal and ground terminal of the second input terminal 1500, respectively; if the energy storage module is a capacitor, the positive bus and ground wire of the capacitor are connected to the positive bus input terminal and ground terminal of the second input terminal 1500, respectively; if the energy storage module is a battery + capacitor, the battery and capacitor are connected in parallel, and the positive bus and ground wires of the battery and capacitor are connected to the positive bus input terminal and ground terminal of the second input terminal 1500, respectively; if the energy storage module is a capacitor + bridge arm + inductor + battery... The system consists of an inductor and a battery. The capacitors include a first capacitor C1 and a second capacitor C2. The bridge arm includes two interconnected switching transistors. The first capacitor C1 is connected in parallel with the bridge arm, and the second capacitor C2 and the battery are both connected in parallel to the lower half-bridge switching transistors of the bridge arm. One end of the inductor is connected between the two switching transistors, and the other end of the inductor is connected to the positive bus of the battery. The positive bus and ground of the first capacitor C1 are connected to the positive bus input terminal and ground terminal of the second input terminal 1500, respectively. The two switching transistors of the bridge arm of the energy storage module are respectively connected to the controller.

[0087] It can be understood that the first power module or the second power module has the following three operating states:

[0088] OFF state: Both the upper and lower half-bridge switches are in the off state;

[0089] Normal modulation state: PWM pulse signals are sent to the six switching transistors respectively. The driving waveform of each switching transistor is obtained by modulation based on the duty cycle calculated by the controller, or the controller can directly control the switching transistors based on the calculated switching state.

[0090] Half-bridge modulation state: The upper half-bridge switching transistor of the first power module (or the second power module) is turned on, or the lower half-bridge switching transistor of the first power module (or the second power module) is turned on. Specifically, there are two methods. The first method is that the controller determines the switching of the six switching transistors (the switching frequency is at the same level as the current fundamental frequency) according to the direction of the three-phase current flow. The switching state of the switching transistors is adjusted so that the N point of the open-winding motor (the intersection point of the three-phase current on the corresponding power module side) alternates to appear on the positive and negative busbars of the first power module or the second power module. In order for the N point of the open-winding motor to alternate to appear on the positive busbar of the first power module or the second power module, at least the upper half-bridge with the corresponding phase of the current flowing from the first power module or the second power module to the open-winding motor must be turned on. In order for the N point of the open-winding motor to alternate to appear on the negative busbar of the first power module or the second power module, at least the lower half-bridge with the corresponding phase of the current flowing from the first power module or the second power module to the open-winding motor must be turned on. The second method is to turn on all three switches in the upper half-bridge or all three switches in the lower half-bridge. In this state, the first three-phase output groups of the open-winding motor are connected, or the second three-phase output groups are connected, making the open-winding motor a star connection.

[0091] If the first method is chosen, when the switching transistors of the first and second power modules are MOSFETs, the switching method of the six transistors is as follows: the upper half-bridge transistors and the lower half-bridge transistors are used alternately at a certain frequency. This switching method helps to reduce conduction losses, balance the heat generation of the upper and lower half-bridge transistors, improve operational reliability, and extend the service life of the transistors. When the switching transistors of the first and second power modules are IGBTs, if the forward voltage drop of the IGBT when it is turned on is less than its reverse current conduction voltage drop, the upper half of the corresponding phase of the current flowing to the open-winding motor can be turned on. The lower half-bridge is the phase corresponding to the current flowing to the open-winding motor. If the forward conduction voltage drop of the IGBT when it is turned on is approximately equal to its reverse conduction voltage drop, no additional switches need to be turned on. For example, to make the N point of the open-winding motor alternately appear on the positive bus of the first power module or the second power module, at least the upper half-bridge with the corresponding phase of the current flowing from the first power module or the second power module to the open-winding motor needs to be turned on. To make the N point of the open-winding motor alternately appear on the negative bus of the first power module or the second power module, at least the lower half-bridge with the corresponding phase of the current flowing from the first power module or the second power module to the open-winding motor needs to be turned on.

[0092] Understandable, based on Figure 1 The topology shown has three operating states for the drive control circuit: dual-ended power supply, independent power supply for the energy storage module, and independent power supply for the mains.

[0093] In the independent power supply state, only the DC device supplies power to the open-winding motor. Correspondingly, in this state, the controller sends PWM pulse signals to the six switching transistors of the first power module to turn on the upper half-bridge switching transistors of the second power module or turn on the lower half-bridge switching transistors of the second power module. That is, the first power module is in normal modulation state, and the second power module is in half-bridge modulation state.

[0094] In the dual-end power supply state, the DC device and the energy storage module simultaneously supply power to the open-winding motor. Correspondingly, in this state, the controller sends PWM pulse signals to the six switching transistors of the first power module and the second power module respectively, that is, both the first power module and the second power module are in normal modulation state.

[0095] In the independent power supply state of the energy storage module, only the energy storage module supplies power to the open winding motor. Correspondingly, in this state, the controller sends PWM pulse signals to the six switching transistors of the second power module, respectively, to turn on the upper half-bridge switching transistors of the first power module or to turn on the lower half-bridge switching transistors of the first power module. That is, the first power module is in half-bridge modulation state, and the second power module is in normal modulation state.

[0096] It is understandable that the drive control circuit can switch between the above three operating states, as shown in the reference. Figure 10 , specifically:

[0097] The drive control circuit has a transition state 1 between the independent power supply state and the dual-end power supply state. At time t1, the second power module switches from the half-bridge modulation state to the normal modulation state, and at time t2, the state switching of the second power module is completed. When the energy storage module switches from the dual-end power supply state to the independent power supply state, the switching action of the second power module is reversed, and the transition principle is similar, which will not be described in detail here.

[0098] The drive control circuit has a transition state two between switching from dual-end power supply to independent power supply of the energy storage module. At time t3, the first power module switches from normal modulation state to half-bridge modulation state, and the state switching of the first power module is completed at time t2. When the energy storage module switches from independent power supply to dual-end power supply, the switching action of the first power module is reversed, and the transition principle is similar, which will not be described in detail here.

[0099] The drive control circuit has a transition state three between the independent power supply state of the energy storage module and the independent power supply state. At time t5, the second power module switches from the normal modulation state to the half-bridge modulation state, and at time t6, the state switching of the second power module is completed. When the energy storage module switches from the independent power supply state to the dual-end power supply state, the switching action of the first power module is reversed. The transition principle is similar and will not be described in detail here.

[0100] In this invention, a transition state is added during the switching of the driving control circuit's operating state, making the switching smoother and improving the stability of the driving control circuit. The following practical example illustrates the operating state switching scenario of the driving control circuit provided in this embodiment:

[0101] Scenario 1: When the drive control circuit is in the independent power supply state, the DC device loses power. At this time, the drive control circuit switches from the independent power supply state to the independent power supply state of the energy storage module.

[0102] Scenario 2: When the DC device loses power while the drive control circuit is in independent power supply mode, the drive control circuit switches from independent power supply mode to dual-end power supply mode. When the voltage of capacitor C drops to a preset value, the drive control circuit switches from dual-end power supply mode to independent power supply mode for energy storage module.

[0103] Scenario 3: When the drive control circuit is in dual-end power supply mode, the DC device loses power, and the drive control circuit switches from dual-end power supply mode to independent power supply mode for the energy storage module.

[0104] Scenario 4: When the voltage drops to a preset value when the drive control circuit is in the independent power supply state of the energy storage module, the drive control circuit switches from the independent power supply state of the energy storage module to the dual-end power supply state.

[0105] It is understood that the above scenarios are merely illustrative, and the embodiments of the present invention do not exhaustively describe each switching scenario.

[0106] It's understandable that the time ratios of dual-end power supply, independent power supply to the energy storage module, and independent power supply to the mains can be controlled based on the load parameters of the open-winding motor. By controlling these time ratios according to the load parameters of the open-winding motor, power outages can be prevented, improving the reliability of the open-winding motor. The load parameters can include the required speed of the open-winding motor, the required power of the air conditioner, the required frequency of the air conditioner, etc.

[0107] Taking the required speed of an open-winding motor as an example, when the required speed of the open-winding motor is high, the proportion of time the drive control circuit is in dual-end power supply mode can be increased, and the proportion of time the drive control circuit is in independent power supply mode for the energy storage module and independent power supply mode can be shortened accordingly. When the required speed of the open-winding motor is low, if the energy storage module has sufficient power, the proportion of time the drive control circuit is in independent power supply mode for the energy storage module can be increased, and the proportion of time the drive control circuit is in dual-end power supply mode and independent power supply mode can be shortened accordingly. It can be understood that the above-mentioned proportions of time in dual-end power supply mode, independent power supply mode for energy storage module, and independent power supply mode are based on the premise that the open-winding motor maintains a certain energy consumption.

[0108] It is understandable that electricity price can also be used as a benchmark for adjusting the time proportion of the three working states of the drive control circuit. If electricity price is used as the benchmark for adjusting the time proportion, then when the electricity price is high, the time proportion of the drive control circuit in the independent power supply state of the energy storage module can be increased, and the time proportion of the drive control circuit in the dual power supply state and the independent power supply state can be shortened accordingly. When the electricity price is low, the time proportion of the drive control circuit in the dual power supply state can be increased, and the time proportion of the drive control circuit in the independent power supply state of the energy storage module and the independent power supply state can be shortened accordingly.

[0109] It is understood that the drive control circuit provided in this embodiment of the invention can charge the energy storage module when the open-winding motor stops, runs, or brakes. Specifically:

[0110] When the open-winding motor stops providing torque (e.g., stops rotating), the positive current phase and the negative current phase are selected. The controller calculates the switching state of the switching transistors of the first power module and the second power module based on at least one of the voltage across capacitor C, the voltage between the positive and negative busbars of the energy storage module, and the three-phase current. Then, it controls the working state of the first power module and the second power module so that the drive control circuit is in a charging state or a discharging state. When the positive current phase is selected as phase X and the negative current phase as phase Y, the switching transistor of the upper half-bridge of phase X of the first power module switches, the switching device of the lower half-bridge of phase Y of the first power module is turned off, the other bridge arms of the first power module are turned off, the diodes of the upper half-bridge of phase X of the second power module are turned on, the diodes of the lower half-bridge of phase Y of the second power module are turned on, and the other bridge arms of the second power module are turned off. When the energy storage module needs to be charged, the control signal of the switching transistor of the upper half-bridge of phase X is determined by the controller through calculation of the duty cycle or current upper and lower limits of the switching transistor of the upper half-bridge of phase X based on the preset charging current of the energy storage module. Phase X can be any one of phases UVW, and phase Y can be any one of the two phases of UVW excluding phase X. (Refer to...) Figure 11For example, when the positive current phase is selected as phase U and the negative current phase is selected as phase W, the switching transistor of the upper half bridge of phase U of the first power module performs a switching action, the switching transistor of the lower half bridge of phase W of the first power module is turned off, the other bridge arms of the first power module are turned off, the upper half bridge of phase U of the second power module is turned on, the lower half bridge of phase W of the second power module is turned on, and the other bridge arms of the second power module are turned off.

[0111] While the open-winding motor is running, the controller calculates the switching state of the switching transistors of the first power module and the second power module based on at least one of the following: load parameters, voltage across capacitor C, voltage between the positive and negative busbars of the energy storage module, three-phase current, and required average charging current. The controller then controls the operating state of the first power module and the second power module, so that the drive control circuit is in a charging state or a discharging state.

[0112] While the open-winding motor is braking, the controller calculates the switching state of the switching transistors of the first power module and the second power module based on at least one of the following: load parameters, voltage across capacitor C, voltage between the positive and negative busbars of the energy storage module, three-phase current, and required average charging current. This allows the controller to control the operating state of the first power module and the second power module, so that the drive control circuit is in a charging or discharging state.

[0113] The working principle of the drive control circuit provided in the embodiments of the present invention is described in detail below.

[0114] By connecting a first power module and a second power module to both ends of an open-winding motor, and with the second power module connected to an energy storage module, the controller sends control signals to the first and second power modules based on the energy storage module's charge level to change the operating state of the drive control circuit. This allows electrical energy to flow bidirectionally during motor operation. When the energy storage module has sufficient energy, it can supply power to the open-winding motor, increasing the motor's operating voltage and improving its operating efficiency.

[0115] It is understandable that the controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit. When the power of the energy storage module is greater than the preset power threshold, it indicates that the energy storage module has sufficient power. At this time, control signals can be sent to the first power module and the second power module to make the drive control circuit in a non-dual-ended power supply state. The energy storage module can be used to supply power to the open winding motor, or the energy storage module can be not used to supply power to the open winding motor.

[0116] The energy storage module's power can be obtained through parameters such as voltage and current, or the voltage of the energy storage module can be directly used as the power. Correspondingly, the power threshold can be the voltage threshold.

[0117] It can be understood that in the non-dual-ended power supply state, the drive control circuit is in an independent power supply state or an independent power supply state for the energy storage module. Correspondingly, the controller sends PWM pulse signals to the six switches of the first power module respectively, turning on the switches of the upper half-bridge or the lower half-bridge of the second power module. At this time, the drive control circuit is in an independent power supply state, and does not use the energy storage module to supply power to the open-winding motor. The open-winding motor operates in a star connection. Alternatively, the controller sends PWM pulse signals to the six switches of the second power module respectively, turning on the switches of the upper half-bridge or the lower half-bridge of the first power module. At this time, the drive control circuit is in an independent power supply state for the energy storage module, using the energy storage module to supply power to the open-winding motor. The open-winding motor operates in a star connection.

[0118] It is understandable that when the energy storage module's charge is less than or equal to the charge threshold, control signals are sent to the first and second power modules based on the load parameters of the open-winding motor to change the operating state of the drive control circuit. When the energy storage module's charge is less than or equal to the charge threshold, it indicates that the energy storage module's charge is insufficient. In this case, control signals are sent to the first and second power modules based on the load parameters of the open-winding motor to change the operating state of the drive control circuit, i.e., determining whether the energy storage module needs to be charged based on the load parameters of the open-winding motor.

[0119] The load parameter can be the required speed of the open-winding motor. Based on this load parameter, control signals are sent to the first and second power modules to change the operating state of the drive control circuit. Specifically, if the required speed of the open-winding motor is less than or equal to a preset speed threshold, indicating a low required speed, PWM pulse signals can be sent to the six switches of the first and second power modules respectively, allowing the power supply to charge the energy storage module, and the open-winding motor operates in an open-winding connection. Conversely, if the required speed of the open-winding motor is greater than the preset speed threshold, indicating a high required speed, PWM pulse signals can be sent to the six switches of the first power module respectively, turning on the upper half-bridge switches or the lower half-bridge switches of the second power module. In this case, the power supply does not charge the energy storage module, and the open-winding motor operates in a star connection.

[0120] It's understandable, and can also be considered from the perspective of electricity costs. When the electricity price is less than or equal to a preset electricity price threshold, PWM pulse signals are sent to the six switches of the first and second power modules respectively, allowing the power supply to charge the energy storage module. The drive control circuit is in a dual-end power supply state, and the open-winding motor runs in an open-winding connection. When the electricity price is greater than the preset electricity price threshold, the working state of the drive control circuit can be controlled according to the power level of the energy storage module. When the energy storage module has sufficient power, PWM pulse signals are sent to the six switches of the second power module respectively, turning on the upper half-bridge switch of the first power module or turning on the lower half-bridge switch of the first power module. At this time, the drive control circuit is in an independent power supply state for the energy storage module, using the energy storage module to supply power to the open-winding motor. The open-winding motor runs in a star connection to reduce energy consumption on the DC device side.

[0121] Reference Figure 12 This invention also provides a drive control circuit for driving an open-winding motor with three-phase windings. One end of each phase winding forms a first three-phase output group 1100, and the other end of each phase winding forms a second three-phase output group 1200. The drive control circuit includes a first power module, a second power module, a power connection terminal 1700, a switch module, an energy storage module, and a controller. The first power module includes a first input terminal 1300 and a first output terminal 1400, with the first output terminal 1400 connected to the first three-phase output group 1100. The second power module includes a second input terminal 1500 and a second output terminal 1200. The second output terminal 1600 is connected to the second three-phase output group 1200. The power connection terminal 1700 is used to connect to the power supply and is connected to the first input terminal 1300. The energy storage module is connected to the second input terminal 1500. The controller is used to send control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit. The controller is connected to both the first power module and the second power module. The switch module is connected between the first input terminal 1300 and the power connection terminal 1700 and is connected to the controller. By connecting the first power module and the second power module at both ends of the open-winding motor, and the second power module is connected to the energy storage module, the controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit. This allows electrical energy to flow bidirectionally during motor operation. When the energy storage module has sufficient energy, it can supply power to the open-winding motor, increasing the motor's operating voltage and improving its operating efficiency. Furthermore, by setting a switch module, the connection between the power connection terminal 1700 and the first power module can be controlled. When the energy storage module supplies power to the open-winding motor, the open-winding motor can operate independently in isolation from the power supply, which helps to reduce the control loss of the open-winding motor.

[0122] Understandable, refer to Figure 13 The switch module includes a first switch, a power connection terminal 1700 including a positive bus connection terminal and a negative bus connection terminal, a first input terminal 1300 including a positive bus input terminal and a negative bus input terminal, the first switch being connected between the positive bus connection terminal and the positive bus input terminal, and the negative bus connection terminal being connected to the negative bus input terminal;

[0123] Or, refer to Figure 14 The switch module includes a first switch, a power connection terminal 1700 including a positive bus connection terminal and a negative bus connection terminal, a first input terminal 1300 including a positive bus input terminal and a negative bus input terminal, the positive bus connection terminal being connected to the positive bus input terminal, and the first switch being connected between the negative bus connection terminal and the negative bus input terminal.

[0124] Or, refer to Figure 15 The switch module includes a first switch and a second switch. The power connection terminal 1700 includes a positive bus connection terminal and a negative bus connection terminal. The first input terminal 1300 includes a positive bus input terminal and a negative bus input terminal. The first switch is connected between the positive bus connection terminal and the positive bus input terminal, and the second switch is connected between the negative bus connection terminal and the negative bus input terminal.

[0125] As can be seen, the switch module can be a single-pole single-throw switch or a double-pole double-throw switch, which has the advantages of simple structure and low cost.

[0126] It is understood that the power connection terminal 1700 is connected to the DC device, and both the first input terminal 1300 and the second input terminal 1500 are provided with a positive bus input terminal and a ground terminal. The first output terminal 1400 and the second output terminal 1600 are both three-phase output terminals. The positive bus and negative bus of the DC device are connected to the positive bus input terminal and the ground terminal of the first input terminal 1300, respectively. The positive bus and ground wire of the energy storage module are connected to the positive bus input terminal and the ground terminal of the second input terminal 1500, respectively. The three-phase output terminal of the first output terminal 1400 is connected to the first three-phase output group 1100 of the open-winding motor, and the three-phase output terminal of the second output terminal 1600 is connected to the second three-phase output group 1200 of the open-winding motor.

[0127] Understandable. Figure 12 The drive control circuit shown may also include a capacitor C, which is connected in parallel between the switching module and the first power module. By setting the capacitor C, the electrical energy of the power supply can be stored, and the signal of the power connection terminal 1700 can be filtered, making the operation of the open winding motor more stable.

[0128] Similarly, both the first power module and the second power module include three parallel bridge arms, each of which includes two series-connected switching transistors. The switching transistors can be MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or IGBTs (Insulated Gate Bipolar Transistors).

[0129] Similarly, refer to Figures 3 to 5 The DC device can be any one of the following: DC power supply, DC power supply + DC converter, or AC power supply + AC-DC converter.

[0130] Similarly, refer to Figures 6 to 9 The energy storage module can be any one of the following: battery, capacitor, battery + capacitor, capacitor + bridge arm + inductor + battery.

[0131] Understandable, based on Figure 12 The circuit topology shown illustrates that the controller sends control signals to the first and second power modules based on the energy storage module's charge level to change the operating state of the drive control circuit. Specifically, when the energy storage module's charge level exceeds a preset charge threshold, the control switch module disconnects, sending control signals to the first and second power modules to control the energy storage module to supply power to the open-winding motor. When the energy storage module's charge level exceeds the preset charge threshold, indicating sufficient charge, the control switch module disconnects, allowing the energy storage module to supply power solely to the open-winding motor, ensuring its normal operation. Furthermore, the isolation provided by the switch module helps reduce control losses in the open-winding motor.

[0132] It is understandable that when the switching module is disconnected, the controller can send PWM pulse signals to the six switching transistors of the second power module respectively, turning on the switching transistors of the upper half-bridge of the first power module or turning on the switching transistors of the lower half-bridge of the second power module. At this time, the open-winding motor runs in star connection; or, the controller can also send PWM pulse signals to the six switching transistors of the first power module and the second power module respectively. At this time, the open-winding motor runs in open-winding connection.

[0133] It is understandable that when the energy storage module's charge is less than or equal to the charge threshold, the control switch module closes, sending control signals to the first and second power modules based on the load parameters of the open-winding motor to change the operating state of the drive control circuit. When the energy storage module's charge is less than or equal to the charge threshold, it indicates that the energy storage module is low on charge. At this time, the control switch module closes, determining whether the energy storage module needs to be charged based on the load parameters of the open-winding motor.

[0134] It should be added that when the switch module is closed, Figure 12 The circuit topology and Figure 1 The circuit topology is the same, so the specific principle of determining whether to charge the energy storage module based on the load parameters of the open-winding motor is also the same when the energy storage module's power is less than or equal to the power threshold. This has been explained above and will not be repeated here.

[0135] Understandable, Figure 12 Based on the circuit topology shown, from the perspective of electricity cost, when the electricity price is less than or equal to a preset electricity price threshold, PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively, so that the power supply can charge the energy storage module. The drive control circuit is in a dual-end power supply state, and the open-winding motor runs in an open-winding connection. When the electricity price is greater than the preset electricity price threshold, the working state of the drive control circuit can be controlled according to the power status of the energy storage module. When the energy storage module has sufficient power, the switching module is disconnected. At this time, the drive control circuit is in an independent power supply state for the energy storage module, and the energy storage module supplies power to the open-winding motor. The open-winding motor runs in a star connection to reduce the energy consumption on the DC device side.

[0136] Understandable, refer to Figure 16 The switching module can also be placed between the second power module and the energy storage module. By controlling the switching module to open and close, the connection between the energy storage module and the second power module can be controlled, thereby controlling the working state of the drive control circuit, which helps to reduce the control loss of the second power module.

[0137] Reference Figure 17 This invention also provides a drive control method, applied to... Figure 1 The drive control circuit shown includes, but is not limited to, the following steps 1701 to 1702:

[0138] Step 1701: Obtain the power level of the energy storage module;

[0139] In step 1701, the amount of power in the energy storage module indicates its power status. The larger the amount of power in the energy storage module, the more sufficient its power is. The amount of power in the energy storage module can be obtained through a sampling circuit.

[0140] Step 1702: Send control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit.

[0141] The energy storage module has three operating states: dual-end power supply, independent power supply for the energy storage module, and independent power supply for the power source. In the independent power supply state, only the DC device supplies power to the open-winding motor. In the dual-end power supply state, both the DC device and the energy storage module supply power to the open-winding motor. In the independent power supply state, only the energy storage module supplies power to the open-winding motor.

[0142] In steps 1701 to 1702 above, by acquiring the power of the energy storage module, the controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running. When the energy storage module has sufficient energy, it can supply power to the open winding motor, improve the operating voltage of the motor, and improve the operating efficiency of the motor.

[0143] It is understandable that in step 1702 above, control signals are sent to the first power module and the second power module according to the power of the energy storage module to change the operating state of the drive control circuit. Specifically, this can be:

[0144] When the energy storage module's power exceeds a preset power threshold, a control signal is sent to the first power module and the second power module to put the drive control circuit into a non-dual-ended power supply state.

[0145] When the energy storage module's power exceeds a preset power threshold, it indicates that the energy storage module has sufficient power. At this time, control signals can be sent to the first power module and the second power module to put the drive control circuit in a non-dual-ended power supply state. The energy storage module can be used to supply power to the open-winding motor, or the energy storage module can be used without supplying power to the open-winding motor.

[0146] It can be understood that sending control signals to the first power module and the second power module to put the drive control circuit in a non-dual-ended power supply state can specifically include:

[0147] PWM pulse signals are sent to the six switching transistors of the first power module respectively to turn on the switching transistors of the upper half bridge of the second power module or to turn on the switching transistors of the lower half bridge of the second power module.

[0148] PWM pulse signals are sent to the six switches of the second power module to turn on the switches of the upper half-bridge of the first power module or to turn on the switches of the lower half-bridge of the first power module.

[0149] In this process, PWM pulse signals are sent to the six switching transistors of the first power module or the second power module respectively, that is, the first power module or the second power module is in a normal modulation state. The driving waveform of each switching transistor is obtained by modulation through the duty cycle calculated by the controller, or the controller can directly control the switching transistors through the calculated switching state.

[0150] Specifically, turning on the upper half-bridge switch of the first power module (or the second power module) or turning on the lower half-bridge switch of the first power module (or the second power module) means that the first power module or the second power module is in a half-bridge modulation state. There are two ways to do this. The first way is that the controller determines the switching of the six switches (the frequency of the switches is at the same level as the current fundamental frequency) according to the direction of the three-phase current flow. The switching state of the switches is adjusted so that the N point of the open-winding motor (the intersection point of the three-phase current on the corresponding power module side) alternates to appear on the positive bus and negative bus of the first power module or the second power module. In order for the N point of the open-winding motor to alternate to appear on the positive bus of the first power module or the second power module, at least the upper half-bridge with the corresponding phase of the current flowing from the first power module or the second power module to the open-winding motor must be turned on. In order for the N point of the open-winding motor to alternate to appear on the negative bus of the first power module or the second power module, at least the lower half-bridge with the corresponding phase of the current flowing from the first power module or the second power module to the open-winding motor must be turned on. The second method is to turn on all three switches in the upper half-bridge or turn on all three switches in the lower half-bridge.

[0151] Therefore, PWM pulse signals are sent to the six switches of the first power module to turn on the switches of the upper half-bridge or the lower half-bridge of the second power module. At this time, the energy storage module is not used to supply power to the open-winding motor, and the open-winding motor operates in a star connection. PWM pulse signals are also sent to the six switches of the second power module to turn on the switches of the upper half-bridge or the lower half-bridge of the first power module. At this time, the energy storage module supplies power to the open-winding motor, and the open-winding motor operates in a star connection.

[0152] It is understandable that in step 1702 above, sending control signals to the first and second power modules based on the energy storage module's power level to change the operating state of the drive control circuit can also be:

[0153] When the energy storage module's charge is less than or equal to the charge threshold, control signals are sent to the first power module and the second power module according to the load parameters of the open-winding motor to change the working state of the drive control circuit.

[0154] When the energy storage module's power is less than or equal to the power threshold, it indicates that the energy storage module's power is insufficient. At this time, control signals are sent to the first power module and the second power module according to the load parameters of the open-winding motor to change the working state of the drive control circuit. That is, it is determined whether the energy storage module needs to be charged according to the load parameters of the open-winding motor.

[0155] It is understood that the load parameters include the required speed of the open-winding motor. Based on the load parameters of the open-winding motor, control signals are sent to the first power module and the second power module to change the operating state of the drive control circuit. Specifically, this can be as follows:

[0156] When the required speed of the open-winding motor is less than or equal to the preset speed threshold, PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively.

[0157] When the required speed of the open-winding motor exceeds the preset speed threshold, PWM pulse signals are sent to the six switching transistors of the first power module to turn on the upper half-bridge switching transistors of the second power module or the lower half-bridge switching transistors of the second power module.

[0158] Specifically, when the required speed of the open-winding motor is less than or equal to the preset speed threshold, it indicates that the required speed of the open-winding motor is low. At this time, PWM pulse signals can be sent to the six switches of the first power module and the second power module respectively, so that the power supply can charge the energy storage module, and the open-winding motor operates in open-winding connection. When the required speed of the open-winding motor is greater than the preset speed threshold, it indicates that the required speed of the open-winding motor is high. At this time, PWM pulse signals can be sent to the six switches of the first power module respectively, turning on the upper half-bridge switch of the second power module or turning on the lower half-bridge switch of the second power module. At this time, the power supply does not charge the energy storage module, and the open-winding motor operates in star connection.

[0159] It is understandable that load parameters can also be the required power of the air conditioner, the required frequency of the air conditioner, etc.

[0160] Understandable, based on Figure 12 The drive control circuit shown above, in step 1702, sends control signals to the first power module and the second power module according to the power level of the energy storage module to change the operating state of the drive control circuit. Specifically, it can also be:

[0161] When the energy storage module's charge exceeds a preset charge threshold, the control switch module disconnects and sends control signals to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor.

[0162] When the energy storage module's power exceeds a preset power threshold, it indicates that the energy storage module has sufficient power, and the control switch module is disconnected. At this time, the energy storage module supplies power to the open-winding motor independently, ensuring the normal operation of the open-winding motor. Furthermore, the isolation effect of the switch module helps to reduce the control losses of the open-winding motor.

[0163] It can be understood that sending control signals to the first and second power modules to control the energy storage module to supply power to the open-winding motor can specifically include:

[0164] PWM pulse signals are sent to the six switches of the second power module respectively to turn on the switches of the upper half bridge of the first power module or to turn on the switches of the lower half bridge of the second power module.

[0165] PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively.

[0166] Specifically, PWM pulse signals are sent to the six switching transistors of the second power module to turn on the upper half-bridge switching transistors of the first power module or the lower half-bridge switching transistors of the second power module, at which point the open-winding motor operates in a star connection; or PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively, at which point the open-winding motor operates in an open-winding connection.

[0167] Understandable, based on Figure 1 or Figure 12 The drive control circuit shown above, in step 1702, sends control signals to the first power module and the second power module according to the power of the energy storage module to change the operating state of the drive control circuit. Alternatively, it can be:

[0168] When the energy storage module's charge is less than or equal to the charge threshold, the control switch module closes and sends control signals to the first and second power modules according to the load parameters of the open-winding motor to change the working state of the drive control circuit.

[0169] When the energy storage module's power is less than or equal to the power threshold, it indicates that the energy storage module's power is insufficient. At this time, the control switch module closes, and the system determines whether the energy storage module needs to be charged based on the load parameters of the open-winding motor.

[0170] It can be understood that the operating states of the drive control circuit include dual-end power supply state, independent power supply state for the energy storage module, and independent power supply state for the power source, among which:

[0171] In the dual-end power supply state, PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively;

[0172] When the energy storage module is powered independently, PWM pulse signals are sent to the six switching transistors of the second power module to turn on the switching transistors of the upper half bridge of the first power module or to turn on the switching transistors of the lower half bridge of the first power module.

[0173] In the independent power supply state, PWM pulse signals are sent to the six switching transistors of the first power module respectively to turn on the switching transistors of the upper half bridge of the second power module or to turn on the switching transistors of the lower half bridge of the second power module.

[0174] Therefore, in step 1702 above, sending control signals to the first power module and the second power module according to the energy storage module's power level to change the operating state of the drive control circuit can also be:

[0175] Based on the energy storage module's power level, control signals are sent to the first and second power modules to change the operating state of the drive control circuit. The time ratio of the dual-end power supply state, the energy storage module independent power supply state, and the power supply independent power supply state is controlled according to the load parameters of the open-winding motor.

[0176] By controlling the time ratio of dual-end power supply, independent power supply of energy storage module, and independent power supply of power source according to the load parameters of the open-winding motor, power outages can be prevented, thus improving the reliability of the open-winding motor operation.

[0177] Taking the required speed of an open-winding motor as an example, when the required speed of the open-winding motor is high, the proportion of time the drive control circuit is in dual-end power supply mode can be increased, and the proportion of time the drive control circuit is in independent power supply mode for the energy storage module and independent power supply mode can be shortened accordingly. When the required speed of the open-winding motor is low, if the energy storage module has sufficient power, the proportion of time the drive control circuit is in independent power supply mode for the energy storage module can be increased, and the proportion of time the drive control circuit is in dual-end power supply mode and independent power supply mode can be shortened accordingly. It can be understood that the above-mentioned proportions of time in dual-end power supply mode, independent power supply mode for energy storage module, and independent power supply mode are based on the premise that the open-winding motor maintains a certain energy consumption.

[0178] It is understandable that electricity price can also be used as a benchmark for adjusting the time proportion of the three working states of the energy storage device. If electricity price is used as the benchmark for adjusting the time proportion, then when the electricity price is high, the time proportion of the drive control circuit in the independent power supply state of the energy storage module can be increased, and the time proportion of the drive control circuit in the dual power supply state and the independent power supply state can be shortened accordingly. When the electricity price is low, the time proportion of the drive control circuit in the dual power supply state can be increased, and the time proportion of the drive control circuit in the independent power supply state of the energy storage module and the independent power supply state can be shortened accordingly.

[0179] In addition, this embodiment of the invention also provides a circuit board including any of the drive control circuits described in the above embodiments. Therefore, the circuit board connects a first power module and a second power module to both ends of the open-winding motor, and the second power module is connected to an energy storage module. The controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running. When the energy storage module has sufficient energy, it can supply power to the open-winding motor, improve the operating voltage of the motor, and improve the operating efficiency of the motor.

[0180] In addition, this embodiment of the invention also provides an air conditioner, including the circuit board described above, or including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the drive control method described in the second aspect. Therefore, the air conditioner connects a first power module and a second power module to both ends of an open-winding motor, and the second power module is connected to an energy storage module. The controller sends control signals to the first power module and the second power module according to the power of the energy storage module to change the working state of the drive control circuit, so that electrical energy can flow bidirectionally when the motor is running. When the energy storage module has sufficient energy, it can supply power to the open-winding motor, increase the operating voltage of the motor, and improve the operating efficiency of the motor.

[0181] Figure 18 An air conditioner 1800 according to an embodiment of the present invention is shown. The air conditioner 1800 includes: a memory 1801, a processor 1802, and a computer program stored in the memory 1801 and executable on the processor 1802. When the computer program is executed, it is used to perform the above-described drive control method.

[0182] The processor 1802 and the memory 1801 can be connected via a bus or other means.

[0183] The memory 1801, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs, such as the drive control method described in the embodiments of the present invention. The processor 1802 implements the above-described drive control method by running the non-transitory software program and instructions stored in the memory 1801.

[0184] The memory 1801 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store the drive control methods described above. Furthermore, the memory 1801 may include high-speed random access memory 1801, and may also include non-transitory memory 1801, such as at least one storage device, flash memory, or other non-transitory solid-state storage device. In some embodiments, the memory 1801 may optionally include memory 1801 remotely located relative to the processor 1802, and these remote memories 1801 may be connected to the air conditioner 1800 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0185] The non-transient software program and instructions required to implement the above-described drive control method are stored in memory 1801. When executed by one or more processors 1802, the above-described drive control method is executed, for example, executing... Figure 17 Method steps 1701 to 1702.

[0186] The present invention also provides a computer-readable storage medium storing computer-executable instructions for performing the above-described drive control method.

[0187] In one embodiment, the computer-readable storage medium stores computer-executable instructions that are executed by one or more control processors, such as a processor 1802 in the air conditioner 1800, causing the processor 1802 to perform the drive control method described above, for example, executing... Figure 17 Method steps 1701 to 1702.

[0188] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0189] Those skilled in the art will understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, storage device storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0190] The above provides a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. A drive control circuit for driving an open-winding motor having three-phase windings, wherein one end of each phase winding forms a first three-phase output group, and the other end of each phase winding forms a second three-phase output group, characterized in that, The drive control circuit includes: The first power module includes a first input terminal and a first output terminal, wherein the first output terminal is connected to the first three-phase output group; The second power module includes a second input terminal and a second output terminal, wherein the second output terminal is connected to the second three-phase output group; A power connection terminal is used to connect to a power source, and the power connection terminal is connected to the first input terminal. The energy storage module is connected to the second input terminal; A capacitor is connected in parallel between the power supply connection terminal and the first power module. A controller is used to send control signals to the first power module and the second power module according to the power of the energy storage module to change the operating state of the drive control circuit. The controller is connected to the first power module and the second power module respectively. When the open-winding motor is running, braking or stopping to provide torque, the controller controls the operating state of the switching transistors of the first power module and the second power module according to at least one parameter among the voltage across the capacitor, the voltage between the positive and negative buses of the energy storage module, and the three-phase current, so that the drive control circuit is in a charging state or a discharging state. In the case where the open-winding motor is in a stopped state, the positive current phase is selected as phase X and the negative current phase is selected as phase Y. The controller controls the switching transistor of the upper half bridge of phase X of the first power module to switch, the switching transistor of the lower half bridge of phase Y and the other bridge arms of the first power module to disconnect, and controls the upper half bridge of phase X and the lower half bridge of phase Y of the second power module to conduct, and the other bridge arms of the second power module to turn off. The X phase is any one of the three phases, and the Y phase is any one of the two phases other than the X phase.

2. The drive control circuit according to claim 1, characterized in that, The drive control circuit also includes: A switch module is connected between the first input terminal and the power connection terminal, and the switch module is connected to the controller.

3. The drive control circuit according to claim 2, characterized in that: The switch module includes a first switch, the power connection terminal includes a positive bus connection terminal and a negative bus connection terminal, the first input terminal includes a positive bus input terminal and a negative bus input terminal, the first switch is connected between the positive bus connection terminal and the positive bus input terminal, and the negative bus connection terminal is connected to the negative bus input terminal; or, The switch module includes a first switch, the power connection terminal includes a positive bus connection terminal and a negative bus connection terminal, the first input terminal includes a positive bus input terminal and a negative bus input terminal, the positive bus connection terminal is connected to the positive bus input terminal, and the first switch is connected between the negative bus connection terminal and the negative bus input terminal; or, The switch module includes a first switch and a second switch. The power connection terminal includes a positive bus connection terminal and a negative bus connection terminal. The first input terminal includes a positive bus input terminal and a negative bus input terminal. The first switch is connected between the positive bus connection terminal and the positive bus input terminal. The second switch is connected between the negative bus connection terminal and the negative bus input terminal.

4. A drive control method, characterized in that, This invention is applied to a drive control circuit for driving an open-winding motor with three-phase windings. One end of each phase winding forms a first three-phase output group, and the other end of each phase winding forms a second three-phase output group. The drive control circuit includes a first power module, a second power module, a power connection terminal, an energy storage module, a capacitor, and a controller. The first power module includes a first input terminal and a first output terminal, with the first output terminal connected to the first three-phase output group. The second power module includes a second input terminal and a second output terminal, with the second output terminal connected to the second three-phase output group. The power connection terminal is connected to the first input terminal. The energy storage module is connected to the second input terminal. The capacitor is connected in parallel between the power connection terminal and the first power module. The controller is connected to both the first power module and the second power module. The drive control method includes: Obtain the power of the energy storage module; Based on the power level, control signals are sent to the first power module and the second power module to change the operating state of the drive control circuit; When the open-winding motor is running, braking, or stopping to provide torque, the operating state of the switching transistors of the first power module and the second power module is controlled according to at least one of the following parameters: the voltage across the capacitor, the voltage between the positive and negative busbars of the energy storage module, and the three-phase current, so that the drive control circuit is in a charging state or a discharging state. When the open-winding motor is in a stopped state, the positive current phase is selected as phase X and the negative current phase is selected as phase Y. The switching transistor of the upper half bridge of phase X of the first power module is controlled to switch, while the lower half bridge of phase Y and the other bridge arms of the first power module are turned off. The upper half bridge of phase X and the lower half bridge of phase Y of the second power module are controlled to turn on, while the other bridge arms of the second power module are turned off. The X phase is any one of the three phases, and the Y phase is any one of the two phases excluding the X phase.

5. The drive control method according to claim 4, characterized in that, The step of sending control signals to the first power module and the second power module according to the power level to change the operating state of the drive control circuit includes: When the power level exceeds a preset power threshold, a control signal is sent to the first power module and the second power module to put the drive control circuit into a non-dual-ended power supply state.

6. The drive control method according to claim 5, characterized in that, Both the first power module and the second power module include three parallel bridge arms, each bridge arm including two series-connected switching transistors. Sending control signals to the first power module and the second power module to put the drive control circuit in a non-dual-ended power supply state includes at least one of the following: PWM pulse signals are sent to the six switching transistors of the first power module respectively to turn on the switching transistors of the upper half-bridge of the second power module or to turn on the switching transistors of the lower half-bridge of the second power module. PWM pulse signals are sent to the six switching transistors of the second power module respectively, turning on the switching transistors of the upper half-bridge of the first power module or turning on the switching transistors of the lower half-bridge of the first power module.

7. The drive control method according to claim 6, characterized in that, The step of sending control signals to the first power module and the second power module according to the power level to change the operating state of the drive control circuit further includes: When the power level is less than or equal to the power threshold, control signals are sent to the first power module and the second power module according to the load parameters of the open-winding motor to change the working state of the drive control circuit.

8. The drive control method according to claim 7, characterized in that, The load parameters include the required speed of the open-winding motor. Sending control signals to the first power module and the second power module according to the load parameters of the open-winding motor to change the operating state of the drive control circuit includes at least one of the following: When the required speed of the open-winding motor is less than or equal to a preset speed threshold, PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively. When the required speed of the open-winding motor is greater than the preset speed threshold, PWM pulse signals are sent to the six switching transistors of the first power module to turn on the switching transistors of the upper half-bridge of the second power module or the switching transistors of the lower half-bridge of the second power module.

9. The drive control method according to claim 4, characterized in that, The drive control circuit further includes a switching module connected between the first input terminal and the power supply terminal. The step of sending control signals to the first power module and the second power module according to the power level to change the operating state of the drive control circuit includes: When the power level exceeds a preset power threshold, the switch module is controlled to disconnect, and control signals are sent to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor.

10. The drive control method according to claim 9, characterized in that, Both the first power module and the second power module include three parallel bridge arms, each bridge arm including two series-connected switching transistors. Sending control signals to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor includes at least one of the following: PWM pulse signals are sent to the six switching transistors of the second power module respectively to turn on the switching transistors of the upper half-bridge of the first power module or to turn on the switching transistors of the lower half-bridge of the second power module; PWM pulse signals are sent to the six switching transistors of the first power module and the second power module respectively.

11. The drive control method according to claim 9 or 10, characterized in that, The step of sending control signals to the first power module and the second power module according to the power level to change the operating state of the drive control circuit includes: When the power level is less than or equal to the power threshold, the switch module is controlled to close, and control signals are sent to the first power module and the second power module according to the load parameters of the open winding motor to change the working state of the drive control circuit.

12. The drive control method according to claim 4, characterized in that, Both the first power module and the second power module include three parallel bridge arms, each bridge arm including two series-connected switching transistors. The operating states include independent power supply, dual-ended power supply, and independent power supply to the energy storage module. Sending control signals to the first power module and the second power module according to the power level to change the operating state of the drive control circuit includes: Control signals are sent to the first power module and the second power module according to the power quantity to change the working state of the drive control circuit, and the time ratio of the independent power supply state, the dual-end power supply state and the independent power supply state of the energy storage module are controlled according to the load parameters of the open winding motor.

13. A circuit board, characterized in that, Includes the drive control circuit as described in any one of claims 1 to 3.

14. An air conditioner, characterized in that, The circuit board as described in claim 13, or the circuit board as described in claim 13, or the circuit board as described in claim 4 to 12, wherein the memory stores a computer program and the processor executes the computer program to implement the drive control method as described in any one of claims 4 to 12.

15. A computer-readable storage medium, characterized in that, The storage medium stores a program that is executed by a processor to implement the drive control method as described in any one of claims 4 to 12.

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