CN114696667A - Drive control circuit, drive control method, circuit board and air conditioner - Google Patents

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

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Publication number
CN114696667A
CN114696667A CN202011633005.XA CN202011633005A CN114696667A CN 114696667 A CN114696667 A CN 114696667A CN 202011633005 A CN202011633005 A CN 202011633005A CN 114696667 A CN114696667 A CN 114696667A
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CN
China
Prior art keywords
power module
module
power
control circuit
energy storage
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Pending
Application number
CN202011633005.XA
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Chinese (zh)
Inventor
江海昊
黄招彬
龙谭
张杰楠
曾贤杰
赵鸣
徐锦清
胡斌
堀部美彦
井上薰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Midea Group Co Ltd, GD Midea Air Conditioning Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN202011633005.XA priority Critical patent/CN114696667A/en
Priority to PCT/CN2021/108992 priority patent/WO2022142310A1/en
Publication of CN114696667A publication Critical patent/CN114696667A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The embodiment of the invention discloses a drive control circuit, a drive control method, a circuit board and an air conditioner, wherein the drive control circuit is connected with a first power module and a second power module at two ends of an open winding motor, the second power module is connected with an energy storage module, and a controller is used for sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the drive control circuit, so that the electric energy can flow in two directions when the motor runs, the energy storage module can supply power to the open winding motor under the condition of sufficient energy, the running voltage of the motor is improved, and the running efficiency of the motor is improved.

Description

Drive control circuit, drive control method, circuit board and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a drive control circuit, a drive control method, a circuit board and an air conditioner.
Background
The air conditioner is a household appliance commonly used in daily life of people, the compressor is an important component of the air conditioner, and the energy consumption of the compressor accounts for a large proportion of the total energy consumption of the air conditioner. Therefore, the efficiency of the compressor is improved, and the whole energy efficiency of the air conditioner is improved obviously. The driving motor of the compressor is generally a permanent magnet synchronous motor, and because the voltage of a power supply is generally fixed and is limited by the voltage of a direct current bus, the compressor is easy to be subjected to voltage saturation in a high-load state and enter weak magnetic control in advance, so that the running efficiency of the motor is reduced.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a drive control circuit, a drive control method, a circuit board and an air conditioner, which can improve the operation efficiency of a motor.
In a first aspect, an embodiment of the present invention provides a drive control circuit, configured to drive an open-winding motor having three-phase windings, where one end of each phase of the winding forms a first three-phase outgoing line group, and the other end of each phase of the winding forms a second three-phase outgoing line group, where the drive control circuit includes:
the first power module comprises a first input end and a first output end, and the first output end is connected with the first three-phase outgoing line group;
the second power module comprises a second input end and a second output end, and the second output end is connected with the second three-phase outgoing line group;
the power supply connecting end is used for connecting a power supply and is connected with the first input end;
the energy storage module is connected with the second input end;
and the controller is used for sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, and is respectively connected with the first power module and the second power module.
The drive control circuit provided by the embodiment of the invention at least has the following beneficial effects: the first power module and the second power module are connected to two ends of the open winding motor, the second power module is connected with the energy storage module, the controller is used for sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, electric energy can flow in two directions when the motor runs, the energy storage module can supply power to the open winding motor under the condition of sufficient energy, the running voltage of the motor is improved, and the running efficiency of the motor is improved.
In some embodiments of the present invention, the drive control circuit further comprises:
and the switch module is connected between the first input end and the power supply connecting end.
In the technical scheme, the switch module is arranged, so that the on-off between the power supply connecting end and the first power module can be controlled, and the open winding motor can be isolated from the power supply to operate independently under the condition that the energy storage module supplies power to the open winding motor, so that the control loss of the open winding motor is reduced.
In some embodiments of the invention, the switch module comprises a first switch, the power connection end comprises a positive bus connection end and a negative bus connection end, the first input end comprises a positive bus input end and a negative bus input end, the first switch is connected between the positive bus connection end and the positive bus input end, and the negative bus connection end is connected with the negative bus input end;
alternatively, the first and second liquid crystal display panels may be,
the switch module comprises a first switch and a second switch, the power supply connecting end comprises a positive bus connecting end and a negative bus connecting end, the first input end comprises a positive bus input end and a negative bus input end, the first switch is connected between the positive bus connecting end and the positive bus input end, and the second switch is connected between the negative bus connecting end and the negative bus input end.
In the technical scheme, the switch module can be a single-pole single-throw switch or a double-pole double-throw switch, and has the advantages of simple structure and low cost.
In some embodiments of the present invention, the drive control circuit further comprises:
a capacitive device connected in parallel between the power connection terminal and the first power module.
In the technical scheme, by arranging the capacitor device, the electric energy of the power supply can be stored, and the signal of the power supply connecting end can be filtered, so that the operation of the open-winding motor is more stable.
In a second aspect, an embodiment of the present invention further provides a driving control method, applied to a driving control circuit, the drive control circuit is used for driving an open winding motor with three-phase windings, one end of each phase of the windings forms a first three-phase wire outlet group, the other end of each phase of the windings forms a second three-phase wire outlet group, the drive control circuit comprises a first power module, a second power module, a power supply connecting end, an energy storage module and a controller, the first power module comprises a first input end and a first output end, the first output end is connected with the first three-phase outgoing line group, the second power module comprises a second input end and a second output end, the second output end is connected with the second three-phase outgoing line group, the power supply connecting end is connected with the first input end, the energy storage module is connected with the second input end, and the controller is respectively connected with the first power module and the second power module;
the drive control method includes:
acquiring the electric quantity of the energy storage module;
and sending control signals to the first power module and the second power module according to the electric quantity so as to change the working state of the drive control circuit.
The drive control method provided by the embodiment of the invention at least has the following beneficial effects: through the electric quantity of obtaining energy storage module, utilize the controller to send control signal to first power module and second power module according to energy storage module's electric quantity in order to change drive control circuit's operating condition for the electric energy can two-way flow when the motor operation, and energy storage module can be to the open winding motor power supply under the sufficient condition of energy, improves the operating voltage of motor, promotes the operating efficiency of motor.
In some embodiments of the present invention, the sending a control signal to the first power module and the second power module according to the power amount to change an operating state of the driving control circuit includes:
and when the electric quantity is larger than a preset electric quantity threshold value, sending a control signal to the first power module and the second power module to enable the driving control circuit to be in a non-double-end power supply state.
In the above technical solution, when the electric quantity of the energy storage module is greater than the preset electric quantity threshold, it indicates that the electric quantity of the energy storage module is sufficient, and at this time, a control signal may be sent to the first power module and the second power module to enable the driving control circuit to be in a non-double-end power supply state, and the energy storage module may be used to supply power to the open-winding motor, or the energy storage module may not be used to supply power to the open-winding motor.
In some embodiments of the present invention, each of the first power module and the second power module includes three bridge arms connected in parallel with each other, each of the bridge arms includes two switching tubes connected in series with each other, and the sending of the control signal to the first power module and the second power module to enable the driving control circuit to be in a non-double-end power supply state includes at least one of:
sending PWM pulse signals to the six switching tubes of the first power module respectively, and conducting the switching tubes of an upper half bridge of the second power module or conducting the switching tubes of a lower half bridge of the second power module;
and PWM pulse signals are respectively sent to the six switching tubes of the second power module, and the switching tubes of the upper half bridge of the first power module are switched on or the switching tubes of the lower half bridge of the first power module are switched on.
In the technical scheme, PWM pulse signals are respectively sent to six switching tubes of a first power module, switching tubes of an upper half-bridge of a second power module or switching tubes of a lower half-bridge of the second power module are conducted, at the moment, power is not supplied to an open-winding motor by an energy storage module, and the open-winding motor runs in star connection; and respectively sending PWM pulse signals to six switching tubes of the second power module, switching on the switching tube of the upper half-bridge of the first power module or switching on the switching tube of the lower half-bridge of the first power module, and supplying power to the open-winding motor by using the energy storage module at the moment, wherein the open-winding motor runs in star connection.
In some embodiments of the present invention, the sending a control signal to the first power module and the second power module according to the electric quantity to change an operating state of the driving control circuit further includes:
and when the electric quantity is smaller than or equal to the electric quantity threshold value, sending a control signal to the first power module and the second power module according to the load quantity parameter of the open winding motor so as to change the working state of the driving control circuit.
In the above technical solution, when the electric quantity is less than or equal to the electric quantity threshold, it indicates that the electric quantity of the energy storage module is insufficient, and at this time, a control signal is sent to the first power module and the second power module according to the load quantity parameter of the open winding motor to change the working state of the driving control circuit, that is, whether the energy storage module needs to be charged is determined according to the load quantity parameter of the open winding motor.
In some embodiments of the present invention, the load parameter includes a required rotation speed of the open-winding motor, and the sending a control signal to the first power module and the second power module according to the load parameter of the open-winding motor to change an operating state of the driving control circuit includes at least one of:
when the required rotating speed of the open-winding motor is less than or equal to a preset rotating speed threshold value, respectively sending PWM pulse signals to six switching tubes of the first power module and the second power module;
when the required rotating speed of the open-winding motor is greater than a preset rotating speed threshold value, PWM pulse signals are respectively sent to the six switch tubes of the first power module, and the switch tubes of the upper half bridge of the second power module or the switch tubes of the lower half bridge of the second power module are switched on.
In the above technical scheme, when the required rotation speed of the open-winding motor is less than or equal to a preset rotation speed threshold, it is indicated that the required rotation speed of the open-winding motor is low at this time, PWM pulse signals may be respectively sent to the six switching tubes of the first power module and the second power module, so that the power supply may charge the energy storage module, and the open-winding motor operates in open-winding connection; when the required rotating speed of the open winding motor is greater than a preset rotating speed threshold value, the required rotating speed of the open winding motor is higher at the moment, the PWM pulse signals can be respectively sent to the six switching tubes of the first power module at the moment, the switching tubes of the upper half bridge of the second power module are switched on or the switching tubes of the lower half bridge of the second power module are switched on, the power supply does not charge the energy storage module at the moment, and the open winding motor runs in star connection.
In some embodiments of the present invention, the driving control circuit further includes a switch module, connected between the first input terminal and the power connection terminal, for sending a control signal to the first power module and the second power module according to the electric quantity to change an operating state of the driving control circuit, including:
when the electric quantity is larger than a preset electric quantity threshold value, the switch module is controlled to be switched off, 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.
In the technical scheme, when the electric quantity is greater than the preset electric quantity threshold value, the electric quantity of the energy storage module is sufficient, the switch module is controlled to be switched off, the energy storage module supplies power to the open winding motor independently at the moment, the normal operation of the open winding motor is ensured, and the isolation effect of the switch module is favorable for reducing the control loss of the open winding motor.
In some embodiments of the present invention, each of the first power module and the second power module includes three bridge arms connected in parallel with each other, each of the bridge arms includes two switching tubes connected in series with each other, and the sending of the control signal 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:
sending PWM pulse signals to six switching tubes of the second power module respectively, and conducting the switching tubes of an upper half bridge of the first power module or conducting the switching tubes of a lower half bridge of the second power module;
and respectively sending PWM pulse signals to the six switching tubes of the first power module and the second power module.
In the above technical solution, the PWM pulse signals are respectively sent to the six switching tubes of the second power module, and the switching tube of the upper half-bridge of the first power module is turned on or the switching tube of the lower half-bridge of the second power module is turned on, at this time, the open-winding motor operates in a star connection; or respectively sending PWM pulse signals to the six switching tubes of the first power module and the second power module, and operating the open-winding motor in open-winding connection at the moment.
In some embodiments of the present invention, the sending a control signal to the first power module and the second power module according to the electric quantity to change an operating state of the driving control circuit includes:
when the electric quantity is smaller than or equal to the electric quantity threshold value, the switch module is controlled to be closed, and control signals are sent to the first power module and the second power module according to the load quantity parameters of the open winding motor so as to change the working state of the drive control circuit.
In the technical scheme, when the electric quantity is smaller than or equal to the electric quantity threshold value, the electric quantity of the energy storage module is insufficient, the switch module is controlled to be closed at the moment, and whether the energy storage module needs to be charged or not is determined according to the load quantity parameter of the open winding motor.
In some embodiments of the present invention, each of the first power module and the second power module includes three bridge arms connected in parallel with each other, and each of the bridge arms includes two switching tubes connected in series with each other; the working state includes a double-end power supply state, an energy storage module independent power supply state and a power supply independent power supply state, and the method for sending a control signal to the first power module and the second power module according to the electric quantity to change the working state of the driving control circuit includes:
and controlling the time ratio of the double-end power supply state, the energy storage module independent power supply state and the power supply independent power supply state according to the load quantity parameter of the open winding motor.
In the technical scheme, the time ratio of the double-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 quantity parameter of the open winding motor, so that the power failure phenomenon of a power supply can be prevented, and the running reliability of the open winding motor is improved.
In a third aspect, an embodiment of the present invention further provides a circuit board, including the drive control circuit described in the first aspect, therefore, the circuit board changes a working state of the drive control circuit by connecting the first power module and the second power module at two ends of the open-winding motor, and connecting the second power module with the energy storage module, and sending a control signal to the first power module and the second power module by using the controller according to an electric quantity of the energy storage module, so that the electric energy can flow in two directions when the motor operates, and the energy storage module can supply power to the open-winding motor when the energy is sufficient, thereby improving an operating voltage of the motor and improving an operating efficiency of the motor.
In a fourth aspect, an embodiment of the present invention further provides an air conditioner, including the circuit board described in the third aspect, or including a memory and a processor, where the memory stores a computer program, and the processor implements the drive control method described in the second aspect when executing the computer program, so that the air conditioner connects the first power module and the second power module at two ends of the open-winding motor, and the second power module is connected with the energy storage module, and the controller is used to send a control signal to the first power module and the second power module according to an electric quantity of the energy storage module to change a working state of the drive control circuit, so that the electric energy can flow in two directions when the motor operates, and the energy storage module can supply power to the open-winding motor when the energy is sufficient, thereby improving an operating voltage of the motor and improving an operating efficiency of the motor.
In a fifth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where the storage medium stores a program, and the program is executed by a processor to implement the drive control method according to the second aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a driving control circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first power module/a second power module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram (dc power supply) of a dc device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another structure of a DC apparatus provided by an embodiment of the present invention (DC power supply + DC-DC converter);
FIG. 5 is a schematic diagram of another structure of a DC device provided by an embodiment of the present invention (AC power source + AC-DC converter);
fig. 6 is a schematic structural diagram (battery) of an energy storage module according to an embodiment of the invention;
fig. 7 is another schematic structural diagram (capacitor) of the energy storage module according to the embodiment of the invention;
fig. 8 is another schematic structural diagram (battery + capacitor) of the energy storage module according to the embodiment of the invention;
fig. 9 is a schematic structural diagram of an energy storage module according to another embodiment of the present invention (capacitor + bridge arm + inductor + battery);
fig. 10 is a schematic diagram illustrating switching of an operating state of a driving control circuit according to an embodiment of the present invention;
fig. 11 is a schematic diagram illustrating a current flow when the energy storage module according to the embodiment of the invention is charged;
fig. 12 is another schematic structural diagram of a driving control circuit according to an embodiment of the present invention (provided with a switch module);
fig. 13 is a schematic structural diagram (single pole single throw) of a switch module provided by an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a switch module according to an embodiment of the present invention (another connection method of single pole and single throw);
fig. 15 is a schematic structural diagram (double pole double throw) of a switch module provided in an embodiment of the present invention;
fig. 16 is another schematic structural diagram of the driving control circuit according to the embodiment of the present invention (the switch module is disposed at another position);
fig. 17 is a flowchart of a drive control method provided by an embodiment of the invention;
fig. 18 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be understood that in the description of the embodiments of the present invention, a plurality (or a plurality) means two or more, more than, less than, more than, etc. are understood as excluding the number, and more than, less than, etc. are understood as including the number. If the description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate the precedence of the indicated technical features.
The air conditioner is a household appliance commonly used in daily life of people, the compressor is an important component of the air conditioner, and the energy consumption of the compressor accounts for a large proportion of the total energy consumption of the air conditioner. Therefore, the efficiency of the compressor is improved, and the whole energy efficiency of the air conditioner is improved obviously. The driving motor of the compressor is generally a permanent magnet synchronous motor, and because the voltage of a power supply is generally fixed and is limited by the voltage of a direct current bus, the compressor is easy to be subjected to voltage saturation in a high-load state and enter weak magnetic control in advance, so that the running efficiency of the motor is reduced.
Based on this, the embodiment of the invention provides a drive control circuit, a drive control method, a circuit board and an air conditioner, which can improve the operation efficiency of a motor.
Referring to fig. 1, an embodiment of the present invention provides a driving control circuit for driving an open-winding motor having three-phase windings, wherein one end of each phase winding forms a first three-phase outgoing line group 1100, and the other end of each phase winding forms a second three-phase outgoing line group 1200, the driving control circuit includes a first power module, a second power module, a power connection end 1700, an energy storage module, and a controller, the first power module includes a first input end 1300 and a first output end 1400, the first output end 1400 is connected to the first three-phase outgoing line group 1100, the second power module includes a second input end 1500 and a second output end 1600, the second output end 1600 is connected to the second three-phase outgoing line group 1200, the power connection end 1700 is used for connecting a power source, the power connection end 1700 is connected to the first input end 1300, the energy storage module is connected to the second input end 1500, the controller is used for sending a control signal to the first power module and the second power module according to an electric quantity of the energy storage module to change an operating state of the driving control circuit, the controller is connected with the first power module and the second power module respectively.
It can be understood that the power connection terminal 1700 is connected to the dc device, the first input terminal 1300 and the second input terminal 1500 are both 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 the negative bus of the dc device are correspondingly connected to the positive bus input terminal and the ground terminal of the first input terminal 1300, the positive bus and the ground line of the energy storage module are correspondingly connected to the positive bus input terminal and the ground terminal of the second input terminal 1500, the three-phase output terminal of the first output terminal 1400 is correspondingly connected to the first three-phase outgoing line group 1100 of the open winding motor, and the three-phase output terminal of the second output terminal 1600 is correspondingly connected to the second three-phase outgoing line group 1200 of the open winding motor.
It can be understood that the driving control circuit may further include a capacitor device C, the capacitor device C is connected in parallel between the power connection end 1700 and the first power module, and by providing the capacitor device C, the electric energy of the power supply may be stored, and the signal of the power connection end 1700 may be filtered, so that the operation of the open-winding motor is more stable.
Referring to fig. 2, each of the first power module and the second power module includes three parallel-connected bridge arms, each of which includes two switching tubes connected in series, where the switching tubes may be MOSFETs (Metal-Oxide-Semiconductor Field-Effect transistors) or IGBTs (Insulated Gate Bipolar transistors).
Referring to fig. 3 to 5, the dc device may be: any one of a DC power supply, a DC power supply + DC-DC converter, an AC power supply + AC-DC converter. The direct current power supply can be a battery or a capacitor. If the dc device is a dc power supply, the positive bus and the ground of the dc power supply are correspondingly connected to the power connection terminal 1700; if the dc device is a dc power supply + dc-dc converter, two output terminals of the dc-dc converter are correspondingly connected to the power connection terminal 1700, wherein a positive bus and a ground line of the dc power supply are correspondingly connected to two input terminals of the dc-dc converter; if the dc device is an ac power source + ac dc converter, two output terminals of the ac dc converter are correspondingly connected to the power connection terminal 1700, wherein a positive bus and a negative bus of the ac power source are correspondingly connected to two input terminals of the ac dc converter.
Referring to fig. 6 to 9, the energy storage module may be any one of a battery, a capacitor, a battery + a capacitor, a capacitor + a bridge arm + an inductor + a battery. If the energy storage module is a battery, a positive bus and a ground wire of the battery are correspondingly connected with the input end of the positive bus and the ground end of the second input end 1500; if the energy storage module is a capacitor, a positive bus and a ground wire of the capacitor are correspondingly connected with the positive bus input end and the ground end of the second input end 1500; if the energy storage module is a battery + capacitor, the battery and the capacitor are connected in parallel, and a positive bus and a ground wire of the battery and the capacitor are correspondingly connected with the input end of the positive bus and the ground end of the second input end 1500; if the energy storage module is a capacitor + a bridge arm + an inductor + a battery, the capacitor comprises a first capacitor C1 and a second capacitor C2, the bridge arm comprises two switching tubes which are connected in series, the first capacitor C1 is connected in parallel with the bridge arm, the second capacitor C2 and the battery are both connected in parallel to a half-bridge switching tube under the bridge arm, one end of the inductor is connected between the two switching tubes, the other end of the inductor is connected with a positive bus of the battery, the positive bus and a ground wire of the first capacitor C1 are correspondingly connected with a positive bus input end and a ground end of the second input end 1500, and the two switching tubes of the bridge arm of the energy storage module are respectively connected with the controller.
It is understood that the first power module or the second power module has the following three operating states:
OFF state: the switching tubes of the upper half bridge and the lower half bridge are in an off state;
normal modulation state: the PWM pulse signals are respectively sent to the six switching tubes, the driving waveforms of the switching tubes are obtained by modulating the duty ratios obtained by calculation of the controller, or the controller can directly control the switching tubes through the calculated switching states;
half-bridge modulation state: switching tubes of an upper half bridge of a first power module (or a second power module) or switching tubes of a lower half bridge of the first power module (or the second power module) are conducted, wherein two specific modes can be provided, the first mode is that a controller determines the switching of six switching tubes according to the flow direction of three-phase current (the frequency of the switching tubes and the current fundamental frequency belong to the same level), the switching state of the switching tubes is adjusted to enable N points of an open winding motor (the intersection point of the three-phase current on the corresponding power module side) to alternately appear on a positive bus and a negative bus of the first power module or the second power module, and in order to enable the N points of the open winding motor to 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 switched on; to alternately present the N points of the open-winding motor to the negative bus of the first power module or the second power module, at least the lower half-bridge of the corresponding phase of current flowing from the first power module or the second power module to the open-winding motor needs to be turned on. The second way is to switch on all three switching tubes of the upper half-bridge or all three switching tubes of the lower half-bridge. In this state, the first three-phase outgoing line groups of the open-winding motor are connected, or the second three-phase outgoing line groups are connected, so that the open-winding motor is in star connection.
If the first mode is selected, when the switching tubes of the first power module and the second power module adopt MOSFETs, the switching modes of the six switching tubes are as follows: the switching mode of alternately switching on the switching tube of the upper half-bridge and switching on the switching tube of the lower half-bridge at a certain frequency is favorable for reducing the conduction loss, so that the switching tubes of the upper half-bridge and the lower half-bridge are balanced in heating, the working reliability is improved, and the service life of the switching tubes is prolonged; when the switching tubes of the first power module and the second power module adopt IGBTs, if the forward conduction voltage drop of the IGBTs when the IGBTs are switched on is smaller than the conduction voltage drop of the reverse through-current, the upper half bridge of the corresponding phase of the current flowing to the open-winding motor can be conducted, and the lower half bridge of the corresponding phase of the current flowing to the open-winding motor can be conducted; if the forward conduction voltage drop when the IGBT is turned on is approximately equal to the conduction voltage drop of the reverse through-current, no redundant switch needs to be turned on, for example, if the open-winding motor N point appears alternately on the positive bus of the first power module or the second power module, at least the upper half bridge of 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 alternately present the N points of the open-winding motor to the negative bus of the first power module or the second power module, at least the lower half-bridge of the corresponding phase of current flowing from the first power module or the second power module to the open-winding motor needs to be turned on.
It can be understood that based on the topology shown in fig. 1, the driving control circuit has three operating states, including a double-end power supply state, an energy storage module independent power supply state, and a power supply independent power supply state, where:
correspondingly, in the state, the controller respectively sends PWM pulse signals to the six switching tubes of the first power module to switch on the switching tubes of the upper half bridge or the switching tubes of the lower half bridge of the second power module, namely, the first power module is in a normal modulation state, and the second power module is in a half bridge modulation state.
Correspondingly, in the state, the controller respectively sends PWM pulse signals to six switching tubes of the first power module and the second power module respectively, namely the first power module and the second power module are in a normal modulation state.
Correspondingly, in the state, the controller sends PWM pulse signals to six switching tubes of the second power module respectively to switch on the switching tube of the upper half bridge of the first power module or switch on the switching tube of the lower half bridge of the first power module, namely, the first power module is in a half-bridge modulation state, and the second power module is in a normal modulation state.
It will be appreciated that the drive control circuit can switch between the three operating states described above, with reference to fig. 10, in particular:
the drive control circuit has a transition state I when the power supply independent power supply state is switched to the double-end power supply state, the second power module is switched to the normal modulation state from the half-bridge modulation state at the time of t1, and the state switching of the second power module is completed at the time of t 2; when the energy storage module is switched from the double-end power supply state to the power supply independent power supply state, the switching action of the second power module is opposite, the transition principle is similar, and the description is omitted here.
The drive control circuit is switched from a double-end power supply state to an energy storage module independent power supply state, a transition state II is formed, the first power module is switched from a normal modulation state to a half-bridge modulation state at the moment t3, and the state switching of the first power module is completed at the moment t 2; when the energy storage module is switched from the independent power supply state of the energy storage module to the double-end power supply state, the switching action of the first power module is opposite, the transition principle is similar, and the description is omitted here.
The driving control circuit has a transition state three when the energy storage module independently supplies power and the power supply independently supplies power, the second power module is switched from a normal modulation state to a half-bridge modulation state at the moment t5, and the state switching of the second power module is completed at the moment t 6; when the energy storage module is switched from the independent power supply state of the energy storage module to the double-end power supply state, the switching action of the first power module is opposite, the transition principle is similar, and the description is omitted here.
The transition state is added in the process of switching the working state of the drive control circuit, so that the working state of the drive control circuit is switched more stably, and the working stability of the drive control circuit is improved. The following practical example illustrates the operation state switching scenario of the driving control circuit provided in the embodiment of the present invention:
scene one: when the driving control circuit is in the independent power supply state of the power supply, the direct-current device is powered off, and at the moment, the driving control circuit is switched to the independent power supply state of the energy storage module from the independent power supply state of the power supply;
scene two: when the driving control circuit is in the independent power supply state of the power supply, the direct current device is powered off, the driving control circuit is switched to the double-end power supply state from the independent power supply state of the power supply, and when the voltage of the capacitor device C is reduced to a preset value, the driving control circuit is switched to the independent power supply state of the energy storage module from the double-end power supply state;
scene three: when the drive control circuit is in a double-end power supply state, the direct-current device is powered off, and the drive control circuit is switched to an energy storage module independent power supply state from the double-end power supply state.
Scene four: when the driving control circuit is in the independent power supply state of the energy storage module, the voltage is reduced to a preset value, and the driving control circuit is switched to the double-end power supply state from the independent power supply state of the energy storage module.
It is understood that the above scenarios are only schematic illustrations, and the embodiments of the present invention do not exhaust the descriptions of the switching scenarios.
It can be understood that the time ratio of the double-end power supply state, the energy storage module independent power supply state and the power supply independent power supply state can be controlled according to the load quantity parameter of the open winding motor. The time ratio of the double-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 quantity parameter of the open winding motor, so that the power failure phenomenon of the power supply can be prevented, and the running reliability of the open winding motor is improved. The load parameter may be a required rotation speed of the open-winding motor, a required power of the air conditioner, a required frequency of the air conditioner, and the like.
The load parameter is taken as the required rotating speed of the open winding motor for illustration, when the required rotating speed of the open winding motor is higher, the time occupation ratio of the drive control circuit in the double-end power supply state can be improved, and the time occupation ratio of the drive control circuit in the energy storage module independent power supply state and the power supply independent power supply state is correspondingly shortened; when the required rotating speed of the open-winding motor is low, if the electric quantity of the energy storage module is sufficient, the time occupation ratio of the drive control circuit in the independent power supply state of the energy storage module can be improved, and the time occupation ratio of the drive control circuit in the double-end power supply state and the independent power supply state of the power supply is correspondingly shortened. It can be understood that the time ratio of the double-end power supply state, the energy storage module independent power supply state and the power supply independent power supply state is controlled on the basis that the open-winding motor keeps certain energy consumption.
It can be understood that the electricity price can also be used as an adjusting reference of the time duty ratio of the three working states of the driving control circuit, if the electricity price is used as the adjusting reference of the time duty ratio, the time duty ratio of the driving control circuit in the independent power supply state of the energy storage module can be improved under the condition of higher electricity price, and the time duty ratio of the driving control circuit in the double-end power supply state and the independent power supply state of the power supply is correspondingly shortened; under the condition of lower electricity price, the time ratio of the drive control circuit in the double-end power supply state can be improved, and the time ratio of the drive control circuit in the energy storage module independent power supply state and the power supply independent power supply state is correspondingly shortened.
It can be understood that the drive control circuit provided in the embodiment of the present invention can charge the energy storage module when the open-winding motor stops, operates, and brakes, specifically:
when the open-winding motor stops providing torque (for example, stops rotating), a positive current phase and a negative current phase are selected, the controller calculates the switching states of the switching tubes of the first power module and the second power module according to at least one of the voltage at the two ends of the capacitor device C, the voltage between the positive bus and the negative bus of the energy storage module and the three-phase current, and then the working states of the first power module and the second power module are controlled, so that the driving control circuit is in a charging state or a discharging state. When the positive current phase is selected as an X phase and the negative current phase is selected as a Y phase, the switching tube of the half bridge on the X phase of the first power module performs switching action, the switching device of the half bridge under the Y phase of the first power module is switched off, other bridge arms of the first power module are switched off, the diode of the half bridge on the X phase of the second power module flows in the direction, the diode of the half bridge under the Y phase of the second power module flows in the direction, and other bridge arms of the second power module are switched off; when the energy storage module needs to be charged, according to the preset charging current of the energy storage module, the duty ratio or the current upper and lower limit value of the switching tube of the half bridge on the X phase is obtained through the operation of a controller, and the control signal of the switching tube of the half bridge on the X phase is determined; wherein, the X phase can be any one phase of UVW, and the Y phase can be any one phase of the other two phases of UVW after the X phase is removed. Referring to fig. 11, for example, when the positive current phase is a U-phase and the negative current phase is a W-phase, the switching tube of the half-bridge above the U-phase of the first power module performs a switching operation, the switching tube of the half-bridge below the W-phase of the first power module is turned off, the other bridge arms of the first power module are turned off, the upper half-bridge above the U-phase of the second power module is turned on, the lower half-bridge below the W-phase of the second power module is turned on, and the other bridge arms of the second power module are turned off.
When the open-winding motor runs, the controller calculates the switching states of the switching tubes of the first power module and the second power module according to at least one of load parameters, voltages at two ends of the capacitor device C, voltages between a positive busbar and a negative busbar of the energy storage module, three-phase currents and required average charging currents, and then controls the working states of the first power module and the second power module, so that the driving control circuit is in a charging state or a discharging state.
When the open-winding motor brakes, the controller calculates the switching states of the switching tubes of the first power module and the second power module according to at least one of load parameters, voltages at two ends of the capacitor device C, voltages between a positive bus and a negative bus of the energy storage module, three-phase currents and required average charging current, and then controls the working states of the first power module and the second power module, so that the driving control circuit is in a charging state or a discharging state.
The operation principle of the drive control circuit provided by the embodiment of the present invention is described in detail below.
The first power module and the second power module are connected to two ends of the open winding motor, the second power module is connected with the energy storage module, the controller is used for sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, electric energy can flow in two directions when the motor runs, the energy storage module can supply power to the open winding motor under the condition of sufficient energy, the running voltage of the motor is improved, and the running efficiency of the motor is improved.
The controller sends a 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, when the electric quantity of the energy storage module is larger than a preset electric quantity threshold value, the fact that the electric quantity of the energy storage module is sufficient is indicated, the controller can send the control signal to the first power module and the second power module to enable the driving control circuit to be in a non-double-end power supply state, the energy storage module can be used for supplying power to the open-winding motor, and the energy storage module can also not be used for supplying power to the open-winding motor.
The electric quantity of the energy storage module can be obtained through parameters such as voltage and current of the energy storage module, or the voltage of the energy storage module is directly used as the electric quantity, and accordingly, the electric quantity threshold can be a voltage threshold.
It can be understood that, in a non-double-end power supply state, that is, in a state where the drive control circuit is independently powered by a power supply or in a state where the energy storage module is independently powered, correspondingly, the controller sends PWM pulse signals to the six switching tubes of the first power module, respectively, to turn on the switching tube of the upper half-bridge of the second power module or turn on the switching tube of the lower half-bridge of the second power module, that is, in this case, in a state where the drive control circuit is independently powered by a power supply, 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; or the controller respectively sends PWM pulse signals to the six switching tubes of the second power module, switches on the switching tube of the upper half-bridge of the first power module or switches on the switching tube of the lower half-bridge of the first power module, at this moment, the driving control circuit is in an independent power supply state of the energy storage module, the energy storage module is used for supplying power to the open-winding motor, and the open-winding motor runs in star connection.
It can be understood that when the electric quantity of the energy storage module is less than or equal to the electric quantity threshold value, a control signal is sent to the first power module and the second power module according to the load quantity parameter of the open-winding motor so as to change the working state of the driving control circuit. When the electric quantity of the energy storage module is smaller than or equal to the electric quantity threshold value, the electric quantity of the energy storage module is insufficient, at the moment, control signals are sent to the first power module and the second power module according to the load quantity parameter of the open winding motor to change the working state of the driving control circuit, and whether the energy storage module needs to be charged or not is determined according to the load quantity parameter of the open winding motor.
The load parameter can be the required rotating speed of the open winding motor, and at the moment, control signals are sent to the first power module and the second power module according to the load parameter of the open winding motor to change the working state of the driving control circuit; when the required rotating speed of the open winding motor is greater than a preset rotating speed threshold value, the required rotating speed of the open winding motor is higher at the moment, the PWM pulse signals can be respectively sent to the six switching tubes of the first power module at the moment, the switching tubes of the upper half bridge of the second power module or the switching tubes of the lower half bridge of the second power module are switched on, the power supply does not charge the energy storage module at the moment, and the open winding motor runs in star connection.
It can be understood that, from the perspective of electricity cost, when the electricity price is less than or equal to the preset electricity price threshold, the PWM pulse signals are respectively sent to six switching tubes of the first power module and the second power module, so that the power supply can charge the energy storage module, the driving control circuit is in a double-end power supply state, and the open-winding motor operates in open-winding connection; when the price of electricity is greater than this predetermined price of electricity threshold value, can be according to the operating condition of energy storage module's electric quantity condition control drive control circuit this moment, when energy storage module electric quantity is sufficient, send PWM pulse signal respectively to six switch tubes of second power module, switch on the switch tube of the last half-bridge of first power module or switch on the switch tube of the lower half-bridge of first power module, drive control circuit is in the independent power supply state of energy storage module this moment promptly, utilize energy storage module to supply power to the open winding motor, the open winding motor operation is in the star connection, with the energy consumption that reduces the direct current device side.
Referring to fig. 12, an embodiment of the present invention further provides a driving control circuit for driving an open-winding motor having three-phase windings, where one end of each phase of winding forms a first three-phase outgoing line group 1100, and the other end of each phase of winding forms a second three-phase outgoing line group 1200, the driving 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, the first output terminal 1400 is connected to the first three-phase outgoing line group 1100, the second power module includes a second input terminal 1500 and a second output terminal 1600, the second output terminal 1600 is connected to the second three-phase outgoing line group 1200, the power connection terminal 1700 is used for connecting a power, the power connection terminal 1700 is connected to the first input terminal 1300, the energy storage module is connected to the second input terminal 1500, and the controller is used for sending a control signal to the first power module and the second power module according to an electric quantity of the energy storage module to change a work load of the driving control circuit In the operating state, the controller is connected to 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 the switch module is connected to the controller. The first power module and the second power module are connected to two ends of the open winding motor, the second power module is connected with the energy storage module, the controller is used for sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, electric energy can flow in two directions when the motor runs, the energy storage module can supply power to the open winding motor under the condition of sufficient energy, the running voltage of the motor is improved, and the running efficiency of the motor is improved. Moreover, the switch module is arranged, so that the on-off state between the power supply connecting end 1700 and the first power module can be controlled, and the open-winding motor can be isolated from the power supply and independently run under the condition that the energy storage module supplies power to the open-winding motor, so that the control loss of the open-winding motor is favorably reduced.
It will be appreciated that, with reference to fig. 13, the switch module comprises a first switch, the power connection 1700 comprises a positive bus connection end and a negative bus connection end, the first input 1300 comprises a positive bus input and a negative bus input, the first switch is connected between the positive bus connection end and the positive bus input, and the negative bus connection end is connected to the negative bus input;
alternatively, referring to fig. 14, the switch module includes a first switch, the power connection end 1700 includes a positive bus connection end and a negative bus connection end, the first input terminal 1300 includes a positive bus input terminal and a negative bus input terminal, the positive bus connection end is connected to the positive bus input terminal, and the first switch is connected between the negative bus connection end and the negative bus input terminal;
alternatively, referring to fig. 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.
Therefore, the switch module can be a single-pole single-throw switch or a double-pole double-throw switch, and has the advantages of simple structure and low cost.
It can be understood that the power connection terminal 1700 is connected to the dc device, the first input terminal 1300 and the second input terminal 1500 are both 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 the negative bus of the dc device are correspondingly connected to the positive bus input terminal and the ground terminal of the first input terminal 1300, the positive bus and the ground line of the energy storage module are correspondingly connected to the positive bus input terminal and the ground terminal of the second input terminal 1500, the three-phase output terminal of the first output terminal 1400 is correspondingly connected to the first three-phase outgoing line group 1100 of the open winding motor, and the three-phase output terminal of the second output terminal 1600 is correspondingly connected to the second three-phase outgoing line group 1200 of the open winding motor.
It can be understood that the driving control circuit shown in fig. 12 may further include a capacitor device C, the capacitor device C is connected in parallel between the switch module and the first power module, and by providing the capacitor device C, the electric energy of the power supply may be stored, and the signal of the power connection terminal 1700 may be filtered, so that the operation of the open-winding motor is more stable.
Similarly, the first power module and the second power module each include three bridge arms connected in parallel with each other, each bridge arm includes two switching tubes connected in series with each other, where the switching tubes may be MOSFETs (Metal-Oxide-Semiconductor Field-Effect transistors) or IGBTs (Insulated Gate Bipolar transistors).
Similarly, referring to fig. 3 to 5, the dc device may be: any one of a DC power supply, a DC power supply + DC converter, an AC power supply + AC DC converter.
Similarly, referring to fig. 6 to 9, the energy storage module may be any one of a battery, a capacitor, a battery + a capacitor, a capacitor + a bridge arm + an inductor + a battery.
It can be understood that based on the circuit topology shown in fig. 12, the controller sends a 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 operating state of the driving control circuit, specifically, when the electric quantity of the energy storage module is greater than a preset electric quantity threshold, the controller controls the switch module to be turned off, and sends a control signal to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor. When the electric quantity of the energy storage module is larger than the preset electric quantity threshold value, the electric quantity of the energy storage module is sufficient, the switch module is controlled to be switched off, the energy storage module supplies power to the open winding motor independently at the moment, the normal operation of the open winding motor is ensured, and the control loss of the open winding motor is favorably reduced through the isolation effect of the switch module.
It can be understood that, when the switch module is turned off, the controller may send PWM pulse signals to the six switch tubes of the second power module, respectively, to turn on the switch tube of the upper half-bridge of the first power module or turn on the switch tube of the lower half-bridge of the second power module, and at this time, the open-winding motor operates in a star connection; or, the controller may also send PWM pulse signals to six switching tubes of the first power module and the second power module, respectively, and at this time, the open-winding motor operates in open-winding connection.
It can be understood that when the electric quantity of the energy storage module is less than or equal to the electric quantity threshold value, the control switch module is closed, and control signals are sent to the first power module and the second power module according to the load quantity parameter of the open winding motor to change the working state of the driving control circuit. When the electric quantity of the energy storage module is smaller than or equal to the electric quantity threshold value, the electric quantity of the energy storage module is insufficient, the switch module is controlled to be closed at the moment, and whether the energy storage module needs to be charged or not is determined according to the load quantity parameter of the open winding motor.
It should be added that, when the switch module is closed, the circuit topology structure of fig. 12 is consistent with the circuit topology structure of fig. 1, and therefore, when the electric quantity of the energy storage module is less than or equal to the electric quantity threshold, the specific principle of determining whether the energy storage module needs to be charged according to the load quantity parameter of the open winding motor is also consistent, which has already been described above, and is not described again here.
It can be understood that, on the basis of the circuit topology shown in fig. 12, from the viewpoint of electricity cost, when the electricity price is less than or equal to the preset electricity price threshold, the PWM pulse signals are respectively sent to the six switching tubes of the first power module and the second power module, so that the power supply can charge the energy storage module, the driving control circuit is in a double-end power supply state, and the open-winding motor operates in open-winding connection; when the price of electricity is greater than this predetermined price of electricity threshold value, can be according to the operating condition of energy storage module's electric quantity condition control drive control circuit this moment, when energy storage module electric quantity was sufficient, disconnection switch module, drive control circuit was in the independent power supply state of energy storage module this moment promptly, utilizes energy storage module to supply power to the open winding motor, and the open winding motor operation is in star connection to reduce the energy consumption of direct current device side.
It can be understood that, referring to fig. 16, the switch module may also be disposed between the second power module and the energy storage module, and the on-off between the energy storage module and the second power module may be controlled by controlling the on-off of the switch module, so as to control the operating state of the driving control circuit, which is beneficial to reducing the control loss of the second power module.
Referring to fig. 17, an embodiment of the present invention further provides a driving control method applied to the driving control circuit shown in fig. 1, where the driving control method includes, but is not limited to, the following steps 1701 to 1702:
step 1701: acquiring the electric quantity of the energy storage module;
in step 1701, the magnitude of the electric quantity of the energy storage module indicates the electric quantity condition of the energy storage module, and the larger the electric quantity of the energy storage module is, the more sufficient the electric quantity of the energy storage module is, wherein the obtaining of the electric quantity of the energy storage module can be realized by a sampling circuit.
Step 1702: and sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit.
The energy storage module has three working states including a double-end power supply state, an energy storage module independent power supply state and a power supply independent power supply state, wherein the power supply independent power supply state supplies power to the open winding motor only through the direct current device, the double-end power supply state direct current device and the energy storage module supply power to the open winding motor simultaneously, and the energy storage module supplies power to the open winding motor only through the energy storage module in the energy storage module independent power supply state.
In the above steps 1701 to 1702, by obtaining the electric quantity of the energy storage module, the controller is utilized to send the control signal to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, so that the electric energy can flow in two directions when the motor runs, the energy storage module can supply power to the open-winding motor under the condition of sufficient energy, the running voltage of the motor is improved, and the running efficiency of the motor is improved.
It can be understood that, in the step 1702, sending a 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 operating state of the driving control circuit may specifically be:
when the electric quantity of the energy storage module is larger than a preset electric quantity threshold value, control signals are sent to the first power module and the second power module so that the driving control circuit is in a non-double-end power supply state.
When the electric quantity of the energy storage module is larger than the preset electric quantity threshold value, the electric quantity of the energy storage module is sufficient, at the moment, a control signal can be sent to the first power module and the second power module to enable the driving control circuit to be in a non-double-end power supply state, the energy storage module can be used for supplying power to the open-winding motor, and the energy storage module can also not be used for supplying power to the open-winding motor.
It can be understood that sending the control signal to the first power module and the second power module to enable the driving control circuit to be in the non-double-ended power supply state may specifically include:
the method comprises the steps that PWM pulse signals are respectively sent to six switching tubes of a first power module, and switching-on of an upper half-bridge switching tube of a second power module or switching-on of a lower half-bridge switching tube of the second power module is conducted;
and respectively sending PWM pulse signals to six switching tubes of the second power module to switch on the switching tube of the upper half-bridge of the first power module or switch on the switching tube of the lower half-bridge of the first power module.
The PWM pulse signals are respectively sent to the six switching tubes of the first power module or the second power module, namely the first power module or the second power module is in a normal modulation state, the driving waveforms of the switching tubes are obtained by modulating the duty ratios obtained by calculation of the controller, or the controller can directly control the switching tubes through the calculated switching states.
Wherein, the switching tube of the upper half-bridge of the first power module (or the second power module) is conducted or the switching tube of the lower half-bridge of the first power module (or the second power module) is conducted, namely, the first power module or the second power module is in a half-bridge modulation state, specifically, there may be two modes, the first mode is that the controller determines the switches of six switching tubes according to the three-phase current flow direction (the frequency of the switches and the current fundamental frequency belong to the same level), the switching state of the switching tubes is adjusted to make N points (the intersection points of the three-phase currents on the corresponding power module sides) of the open-winding motor alternately appear on the positive bus and the negative bus of the first power module or the second power module, in order to enable the N points of the open-winding motor to alternately appear on the positive bus of the first power module or the second power module, at least an upper half bridge of a corresponding phase of current flowing from the first power module or the second power module to the open-winding motor needs to be opened; to alternately present the N points of the open-winding motor to the negative bus of the first power module or the second power module, at least the lower half-bridge of the corresponding phase of current flowing from the first power module or the second power module to the open-winding motor needs to be turned on. The second way is to switch on all three switching tubes of the upper half-bridge or all three switching tubes of the lower half-bridge.
Therefore, the PWM pulse signals are respectively sent to the six switching tubes of the first power module, the switching tube of the upper half-bridge of the second power module is conducted or the switching tube of the lower half-bridge of the second power module is conducted, at the moment, the energy storage module is not utilized to supply power to the open-winding motor, and the open-winding motor runs in star connection; and respectively sending PWM pulse signals to six switching tubes of the second power module, switching on the switching tube of the upper half-bridge of the first power module or switching on the switching tube of the lower half-bridge of the first power module, and supplying power to the open-winding motor by using the energy storage module at the moment, wherein the open-winding motor runs in star connection.
It can be understood that, in the step 1702, 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 operating state of the driving control circuit may further be:
when the electric quantity of the energy storage module is smaller than or equal to the electric quantity threshold value, control signals are sent to the first power module and the second power module according to the load quantity parameters of the open winding motor so as to change the working state of the driving control circuit.
When the electric quantity of the energy storage module is smaller than or equal to the electric quantity threshold value, the electric quantity of the energy storage module is insufficient, at the moment, control signals are sent to the first power module and the second power module according to the load quantity parameter of the open winding motor to change the working state of the driving control circuit, and whether the energy storage module needs to be charged or not is determined according to the load quantity parameter of the open winding motor.
It can be understood that the load parameter includes a required rotation speed of the open-winding motor, and the control signal is sent to the first power module and the second power module according to the load parameter of the open-winding motor to change the operating state of the driving control circuit, which may specifically be:
when the required rotating speed of the open-winding motor is less than or equal to a preset rotating speed threshold value, respectively sending PWM pulse signals to six switching tubes of the first power module and the second power module;
when the required rotating speed of the open-winding motor is greater than a preset rotating speed threshold value, PWM pulse signals are respectively sent to the six switching tubes of the first power module, and the switching tube of the upper half-bridge of the second power module is conducted or the switching tube of the lower half-bridge of the second power module is conducted.
When the required rotating speed of the open-winding motor is less than or equal to a preset rotating speed threshold value, the required rotating speed of the open-winding motor is low at the moment, PWM pulse signals can be respectively sent to six switching tubes of the first power module and the second power module at the moment, so that the power supply can charge the energy storage module, and the open-winding motor runs in open-winding connection; when the required rotating speed of the open winding motor is greater than a preset rotating speed threshold value, the required rotating speed of the open winding motor is higher, PWM pulse signals can be sent to the six switching tubes of the first power module respectively at the moment, the switching tubes of the upper half bridge of the second power module or the switching tubes of the lower half bridge of the second power module are conducted, the power supply does not charge the energy storage module at the moment, and the open winding motor operates in star connection.
It is understood that the load parameter may also be a required power of the air conditioner, a required frequency of the air conditioner, and the like.
It can be understood that based on the driving control circuit shown in fig. 12, in the step 1702, the control signal is sent to the first power module and the second power module according to the electric quantity of the energy storage module to change the operating state of the driving control circuit, specifically, the method may also be:
when the electric quantity of the energy storage module is larger than a preset electric quantity threshold value, the switch module is controlled to be switched off, 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.
When the electric quantity of the energy storage module is larger than the preset electric quantity threshold value, the electric quantity of the energy storage module is sufficient, the control switch module is switched off, the energy storage module supplies power to the open winding motor independently at the moment, the normal operation of the open winding motor is ensured, and the control loss of the open winding motor is favorably reduced through the isolation effect of the switch module.
It can be understood that sending a control signal to the first power module and the second power module to control the energy storage module to supply power to the open-winding motor may specifically include:
the method comprises the steps that PWM pulse signals are respectively sent to six switching tubes of a second power module, and switching-on of an upper half-bridge switching tube of a first power module or switching-on of a lower half-bridge switching tube of the second power module is conducted;
and respectively sending PWM pulse signals to six switching tubes of the first power module and the second power module.
The PWM pulse signals are respectively sent to six switching tubes of the second power module, the switching tube of an upper half-bridge of the first power module is conducted or the switching tube of a lower half-bridge of the second power module is conducted, and at the moment, the open winding motor runs in star connection; or the PWM pulse signals are respectively sent to the six switching tubes of the first power module and the second power module, and at the moment, the open-winding motor runs in open-winding connection.
It can be understood that, based on the driving control circuit shown in fig. 1 or fig. 12, in the step 1702, the 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 operating state of the driving control circuit may also be:
when the electric quantity of the energy storage module is smaller than or equal to the electric quantity threshold value, the switch module is controlled to be closed, and control signals are sent to the first power module and the second power module according to the load quantity parameters of the open winding motor so as to change the working state of the driving control circuit.
When the electric quantity of the energy storage module is smaller than or equal to the electric quantity threshold value, the electric quantity of the energy storage module is insufficient, the switch module is controlled to be closed at the moment, and whether the energy storage module needs to be charged or not is determined according to the load quantity parameter of the open winding motor.
It can be understood that the operating state of the driving control circuit includes a double-end power supply state, an energy storage module independent power supply state and a power supply independent power supply state, wherein:
under the double-end power supply state, respectively sending PWM pulse signals to six switching tubes of a first power module and a second power module;
under the independent power supply state of the energy storage module, PWM pulse signals are respectively sent to six switching tubes of the second power module, and switching-on of an upper half-bridge switching tube of the first power module or switching-on of a lower half-bridge switching tube of the first power module is conducted;
under the independent power supply state of a power supply, PWM pulse signals are respectively sent to six switching tubes of a first power module, and switching tubes of an upper half-bridge of a second power module or switching tubes of a lower half-bridge of the second power module are conducted;
therefore, in step 1702, sending a 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 operating state of the driving control circuit may be:
and sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, and controlling the time ratio of the double-end power supply state, the energy storage module independent power supply state and the power supply independent power supply state according to the load quantity parameter of the open winding motor.
The time proportion of the double-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 quantity parameter of the open winding motor, so that the power failure phenomenon of a power supply can be prevented, and the running reliability of the open winding motor is improved.
The load parameter is taken as the required rotating speed of the open winding motor for illustration, when the required rotating speed of the open winding motor is higher, the time occupation ratio of the drive control circuit in the double-end power supply state can be improved, and the time occupation ratio of the drive control circuit in the energy storage module independent power supply state and the power supply independent power supply state is correspondingly shortened; when the required rotating speed of the open-winding motor is low, if the electric quantity of the energy storage module is sufficient, the time occupation ratio of the drive control circuit in the independent power supply state of the energy storage module can be improved, and the time occupation ratio of the drive control circuit in the double-end power supply state and the independent power supply state of the power supply is correspondingly shortened. It can be understood that the time ratio of the double-end power supply state, the energy storage module independent power supply state and the power supply independent power supply state is controlled on the basis that the open-winding motor keeps certain energy consumption.
It can be understood that the electricity price can also be used as an adjusting reference of the time duty ratio of the three working states of the energy storage device, if the electricity price is used as the adjusting reference of the time duty ratio, the time duty ratio of the drive control circuit in the independent power supply state of the energy storage module can be improved under the condition of higher electricity price, and the time duty ratio of the drive control circuit in the double-end power supply state and the independent power supply state of the power supply is correspondingly shortened; under the condition of lower electricity price, the time ratio of the drive control circuit in the double-end power supply state can be improved, and the time ratio of the drive control circuit in the energy storage module independent power supply state and the power supply independent power supply state is correspondingly shortened.
In addition, the embodiment of the present invention further provides a circuit board, including any one of the driving control circuits described in the above embodiments, therefore, the circuit board is configured to connect the first power module and the second power module at two ends of the open-winding motor, and the second power module is connected to the energy storage module, and the controller is configured to send a 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 in two directions when the motor operates, and the energy storage module can supply power to the open-winding motor when the energy is sufficient, thereby improving the operating voltage of the motor and improving the operating efficiency of the motor.
In addition, an embodiment of the present invention further provides an air conditioner, including the circuit board, or including a memory and a processor, where the memory stores a computer program, and the processor implements the driving control method according to the second aspect when executing the computer program, so that the air conditioner connects the first power module and the second power module at two ends of the open-winding motor, and the second power module is connected with the energy storage module, and the controller is used to send a control signal to the first power module and the second power module according to an electric quantity of the energy storage module to change a working state of the driving control circuit, so that electric energy can flow in two directions when the motor operates, and the energy storage module can supply power to the open-winding motor when the energy is sufficient, thereby improving an operating voltage of the motor and improving an operating efficiency of the motor.
Fig. 18 shows an air conditioner 1800 according to an embodiment of the present invention. The air conditioner 1800 includes: the memory 1801, the processor 1802, and a computer program stored on the memory 1801 and executable on the processor 1802, the computer program being operable to perform the above-described drive control method.
The processor 1802 and the memory 1801 may be connected by a bus or other means.
The memory 1801 serves as a non-transitory computer-readable storage medium, and may be used for storing a non-transitory software program and a non-transitory computer-executable program, such as the driving control method described in the embodiments of the present invention. The processor 1802 implements the drive control method described above by executing a non-transitory software program and instructions stored in the memory 1801.
The memory 1801 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data for performing the driving control method described above. Further, 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 device, or other non-transitory solid state storage device. In some embodiments, the memory 1801 may optionally include memory 1801 located remotely from the processor 1802, and such remote memory 1801 may be coupled 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.
Non-transitory software programs and instructions necessary to implement the drive control methods described above are stored in the memory 1801 and, when executed by the one or more processors 1802, perform the drive control methods described above, e.g., perform method steps 1701-1702 in fig. 17.
The embodiment of the invention also provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used for executing the drive control method.
In one embodiment, the computer-readable storage medium stores computer-executable instructions that, when executed by one or more control processors, for example, a processor 1802 of the air conditioner 1800, cause the processor 1802 to perform the drive control method described above, for example, performing method steps 1701-1702 of fig. 17.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, storage device storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims (16)

1. A drive control circuit for driving an open-winding motor having three-phase windings, one end of each of the phases of the windings constituting a first three-phase outgoing line group, and the other end of each of the phases of the windings constituting a second three-phase outgoing line group, the drive control circuit comprising:
the first power module comprises a first input end and a first output end, and the first output end is connected with the first three-phase outgoing line group;
the second power module comprises a second input end and a second output end, and the second output end is connected with the second three-phase outgoing line group;
the power supply connecting end is used for connecting a power supply and is connected with the first input end;
the energy storage module is connected with the second input end;
and the controller is used for sending control signals to the first power module and the second power module according to the electric quantity of the energy storage module so as to change the working state of the driving control circuit, and is respectively connected with the first power module and the second power module.
2. The drive control circuit according to claim 1, characterized in that the drive control circuit further comprises:
the switch module is connected between the first input end and the power connection end and is connected with the controller.
3. The drive control circuit according to claim 2, characterized in that:
the switch module comprises a first switch, the power supply connecting end comprises a positive bus connecting end and a negative bus connecting end, the first input end comprises a positive bus input end and a negative bus input end, the first switch is connected between the positive bus connecting end and the positive bus input end, and the negative bus connecting end is connected with the negative bus input end;
alternatively, the first and second electrodes may be,
the switch module comprises a first switch, the power supply connecting end comprises a positive bus connecting end and a negative bus connecting end, the first input end comprises a positive bus input end and a negative bus input end, the positive bus connecting end is connected with the positive bus input end, and the first switch is connected between the negative bus connecting end and the negative bus input end;
alternatively, the first and second electrodes may be,
the switch module comprises a first switch and a second switch, the power supply connecting end comprises a positive bus connecting end and a negative bus connecting end, the first input end comprises a positive bus input end and a negative bus input end, the first switch is connected between the positive bus connecting end and the positive bus input end, and the second switch is connected between the negative bus connecting end and the negative bus input end.
4. The drive control circuit according to any one of claims 1 to 3, characterized by further comprising:
a capacitive device connected in parallel between the power connection terminal and the first power module.
5. A drive control method is applied to a drive control circuit for driving an open-winding motor having three-phase windings, one end of each of the windings constitutes a first three-phase outgoing line group, the other end of each of the windings constitutes a second three-phase outgoing line group, the drive control circuit comprises a first power module, a second power module, a power supply connecting end, an energy storage module and a controller, the first power module comprises a first input end and a first output end, the first output end is connected with the first three-phase outgoing line group, the second power module comprises a second input end and a second output end, the second output end is connected with the second three-phase outgoing line group, the power supply connecting end is connected with the first input end, the energy storage module is connected with the second input end, and the controller is respectively connected with the first power module and the second power module;
the drive control method includes:
acquiring the electric quantity of the energy storage module;
and sending control signals to the first power module and the second power module according to the electric quantity so as to change the working state of the drive control circuit.
6. The driving control method according to claim 5, wherein the sending control signals to the first power module and the second power module according to the electric quantity to change the operating state of the driving control circuit comprises:
and when the electric quantity is larger than a preset electric quantity threshold value, sending a control signal to the first power module and the second power module to enable the driving control circuit to be in a non-double-end power supply state.
7. The driving control method according to claim 6, wherein the first power module and the second power module each include three parallel-connected bridge arms, each of the bridge arms includes two switching tubes connected in series, and the sending the control signal to the first power module and the second power module to make the driving control circuit in the non-double-end power supply state includes at least one of:
sending PWM pulse signals to the six switching tubes of the first power module respectively, and conducting the switching tubes of an upper half bridge of the second power module or conducting the switching tubes of a lower half bridge of the second power module;
and PWM pulse signals are respectively sent to the six switching tubes of the second power module, and the switching tubes of the upper half bridge of the first power module are switched on or the switching tubes of the lower half bridge of the first power module are switched on.
8. The method of claim 7, wherein the 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 driving control circuit further comprises:
and when the electric quantity is smaller than or equal to the electric quantity threshold value, sending a control signal to the first power module and the second power module according to the load quantity parameter of the open winding motor so as to change the working state of the driving control circuit.
9. The driving control method according to claim 8, wherein the load parameter includes a required rotation speed of the open-winding motor, and the sending of the control signal to the first power module and the second power module according to the load parameter of the open-winding motor to change the operating state of the driving control circuit includes at least one of:
when the required rotating speed of the open-winding motor is less than or equal to a preset rotating speed threshold value, respectively sending PWM pulse signals to six switching tubes of the first power module and the second power module;
when the required rotating speed of the open-winding motor is greater than a preset rotating speed threshold value, PWM pulse signals are respectively sent to the six switch tubes of the first power module, and the switch tubes of the upper half bridge of the second power module or the switch tubes of the lower half bridge of the second power module are switched on.
10. The driving control method according to claim 5, wherein the driving control circuit further comprises a switch module, the switch module is connected between the first input terminal and the power connection terminal, and the sending of the control signal to the first power module and the second power module according to the electric quantity to change the operating state of the driving control circuit comprises:
when the electric quantity is larger than a preset electric quantity threshold value, the switch module is controlled to be switched off, 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.
11. The driving control method according to claim 10, wherein the first power module and the second power module each include three bridge arms connected in parallel with each other, each bridge arm includes two switching tubes connected in series with each other, and the sending of the control signal 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:
sending PWM pulse signals to six switching tubes of the second power module respectively, and conducting the switching tubes of an upper half bridge of the first power module or conducting the switching tubes of a lower half bridge of the second power module;
and respectively sending PWM pulse signals to the six switching tubes of the first power module and the second power module.
12. The driving control method according to claim 10 or 11, wherein the sending a control signal to the first power module and the second power module according to the electric quantity to change the operating state of the driving control circuit comprises:
when the electric quantity is smaller than or equal to the electric quantity threshold value, the switch module is controlled to be closed, and control signals are sent to the first power module and the second power module according to the load quantity parameters of the open winding motor so as to change the working state of the drive control circuit.
13. The driving control method according to claim 5, wherein the first power module and the second power module each include three bridge arms connected in parallel, each bridge arm includes two switching tubes connected in series, the operating states include a power supply independent power supply state, a double-end power supply state and an energy storage module independent power supply state, and the sending the control signal to the first power module and the second power module according to the electric quantity to change the operating state of the driving control circuit includes:
and sending control signals to the first power module and the second power module according to the electric quantity so as to change the working state of the drive control circuit, and controlling the time ratio of the independent power supply state of the power supply, the double-end power supply state and the independent power supply state of the energy storage module according to the load parameter of the open winding motor.
14. A wiring board comprising the drive control circuit according to any one of claims 1 to 4.
15. An air conditioner, characterized by comprising the circuit board of claim 14, or comprising a memory storing a computer program and a processor implementing the drive control method of any one of claims 5 to 13 when the processor executes the computer program.
16. A computer-readable storage medium characterized in that the storage medium stores a program executed by a processor to implement the drive control method according to any one of claims 5 to 13.
CN202011633005.XA 2020-12-31 2020-12-31 Drive control circuit, drive control method, circuit board and air conditioner Pending CN114696667A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202011633005.XA CN114696667A (en) 2020-12-31 2020-12-31 Drive control circuit, drive control method, circuit board and air conditioner
PCT/CN2021/108992 WO2022142310A1 (en) 2020-12-31 2021-07-28 Drive control circuit, drive control method, circuit board and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011633005.XA CN114696667A (en) 2020-12-31 2020-12-31 Drive control circuit, drive control method, circuit board and air conditioner

Publications (1)

Publication Number Publication Date
CN114696667A true CN114696667A (en) 2022-07-01

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Application Number Title Priority Date Filing Date
CN202011633005.XA Pending CN114696667A (en) 2020-12-31 2020-12-31 Drive control circuit, drive control method, circuit board and air conditioner

Country Status (1)

Country Link
CN (1) CN114696667A (en)

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