Motor control system and method of range hood, related equipment and range hood

Abstract

The invention provides a range hood motor control system and method, related equipment and a range hood. Relates to the technical field of electric appliances. The power supply module comprises a power factor correction unit, the power factor correction unit is electrically connected with the inversion module, the power factor correction unit is used for performing voltage amplification processing on an input power supply to generate a first power supply signal and outputting the first power supply signal to the inversion module, and the power factor correction unit comprises a gallium nitride transistor; and the inversion module is electrically connected with the motor and is used for driving the motor under the action of the first power supply signal. Therefore, a direct-current electric signal with a larger voltage value is obtained, vector control of the motor is made to take the bus voltage such as 380V as the reference and is not limited to the rectified voltage value of 110V or 220V any more, a motor control system is made to be suitable for a power supply system with the voltage value in a wider range, and the applicability and generalization of the motor control system are improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical appliance technology, and more specifically, to a motor control system for a range hood, a motor control method for a range hood, an electronic device, a storage medium, and a range hood. Background Art

[0002] Generally, the grid voltage in different regions or countries can be divided into two AC standards: 110V and 220V. Variable frequency range hoods usually sample the bus voltage for motor vector control and undervoltage protection. For different input voltages, the software and hardware of the motor control system need to be differentiated accordingly. Two sets of motor control systems need to be set for different grid voltages, which limits the application scope of range hood products.

[0003] Therefore, a new technical solution is urgently needed to solve the above technical problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, the present invention provides a motor control system for a range hood, comprising: Electrically connected power modules and inverter modules; The power module includes a power factor correction unit, which is electrically connected to the inverter module. The power factor correction unit is used to amplify the voltage of the input power to generate a first power signal, and output the first power signal to the inverter module, wherein the power factor correction unit includes a gallium nitride transistor; The inverter module is electrically connected to the motor, and the inverter module is used to drive the motor under the action of the first power supply signal.

[0006] In some embodiments, the power factor correction unit includes: a first inductor and an analog control subunit, One end of the first inductor is electrically connected to the input power supply, and the other end of the first inductor is electrically connected to the first electrode of the gallium nitride transistor; The first input terminal of the analog control subunit is electrically connected to the first node, the first node is electrically connected to the first electrode and the second electrode of the gallium nitride transistor respectively, the second input terminal of the analog control subunit is electrically connected to the second electrode of the gallium nitride transistor, the third input terminal of the analog control subunit is electrically connected to the first inductor, and the analog control subunit is used to control the conduction or cutoff of the gallium nitride transistor, wherein the first electrode is one of the source and the drain of the gallium nitride transistor, and the second electrode is the other of the source and the drain of the gallium nitride transistor.

[0007] In some embodiments, the first input terminal of the analog control subunit is used to receive a first voltage signal between the first electrode and the second electrode, the second input terminal of the analog control subunit is used to receive a first current signal flowing through the second electrode, and the third input terminal of the analog control subunit is used to receive a second current signal flowing through the first inductor. The analog control subunit is used to generate a first control signal based on the first voltage signal, the first current signal, and the second current signal, and the first control signal is used to control the conduction or cutoff of the gallium nitride transistor.

[0008] In some embodiments, the analog control subunit further includes: a sampling module and a control module, and the analog control subunit includes: a first comparator, a second comparator, a signal conditioning circuit and a trigger. The first input terminal of the first comparator is electrically connected to the second electrode, the second input terminal of the first comparator is electrically connected to the output terminal of the signal conditioning circuit, the first input terminal of the signal conditioning circuit is electrically connected to the first node, the second input terminal of the signal conditioning circuit is electrically connected to the sampling module, the third input terminal of the signal conditioning circuit is electrically connected to the control module, the output terminal of the first comparator is electrically connected to the first input terminal of the trigger, and the sampling module is used to sample the input power supply; A first input terminal of the second comparator is electrically connected to the first inductor, a second input terminal of the second comparator is electrically connected to the control module, and an output terminal of the second comparator is electrically connected to the second input terminal of the trigger; The first output terminal and the second output terminal of the trigger are both electrically connected to the gate of the gallium nitride transistor, and the trigger is used to control the conduction or cutoff of the gallium nitride transistor.

[0009] In some embodiments, the first input terminal of the signal conditioning circuit is used to receive a first voltage signal, the second input terminal of the signal conditioning circuit is used to receive a voltage sampling signal of an input power supply, and the third input terminal of the signal conditioning circuit is used to receive a preset reference voltage signal, wherein the preset reference voltage signal is generated by the control module in response to an input operation of a user, the signal conditioning circuit is used to generate a third current signal based on the first voltage signal, the voltage sampling signal, and the preset reference voltage signal, and output the third current signal to the second input terminal of the first comparator, the first input terminal of the first comparator is used to receive the first current signal, and the first comparator is used to output a first trigger signal under the action of the first current signal and the third current signal; The first input terminal of the second comparator is used to receive the second current signal, the second input terminal of the second comparator is used to receive the preset reference voltage signal, and the second comparator is used to output a second trigger signal under the action of the second current signal and the preset reference voltage signal; The trigger is used to output a first control signal under the action of a first trigger signal and a second trigger signal.

[0010] In some embodiments, the power factor correction unit includes a first diode, a first capacitor, and a load; The anode of the first diode is electrically connected to the first inductor, the cathode of the first diode is electrically connected to the first capacitor and the load respectively via the second node, and the first capacitor and the load are connected in parallel.

[0011] In some embodiments, the power factor correction unit includes a second diode, An anode of the second diode is electrically connected to the first inductor, and a cathode of the second diode is electrically connected to the second node.

[0012] In some embodiments, it further includes: a frequency conversion module; The power supply module includes a voltage adjustment unit, which is electrically connected to the power factor correction unit, the control module and the frequency conversion module respectively. The voltage adjustment unit is used to generate a second power supply signal based on a first power supply signal transmitted from the power factor correction unit to provide the second power supply signal to the control module and the frequency conversion module, wherein the voltage adjustment unit includes a gallium nitride transistor.

[0013] In some embodiments, it further comprises: An AC power supply, an electromagnetic compatibility filter module and a rectifier filter module, one end of the electromagnetic compatibility filter module is electrically connected to the AC power supply, the other end of the electromagnetic compatibility filter module is electrically connected to the rectifier filter module, the rectifier filter module is electrically connected to the power factor correction unit, and the rectifier filter module is used to provide a DC signal to the power factor correction unit.

[0014] In a second aspect, a motor control method for a range hood is also proposed, which is applied to the motor control system of the range hood as described above. The control method includes: controlling a power factor correction unit to generate a first power signal based on an input power supply to provide the first power signal to the inverter module, wherein the power factor correction unit includes a gallium nitride transistor; The inverter module is controlled to drive the motor under the action of the first power supply signal.

[0015] In some embodiments, when the motor control system of the range hood includes a first inductor, the method further includes: Acquire a second current signal of the first inductor; Performing signal sampling on the input power supply to obtain a sampled voltage signal; Based on the second current signal and the sampled voltage signal, the gallium nitride transistor in the power factor correction unit is controlled to be turned on or off.

[0016] In some embodiments, controlling the power factor correction unit to generate a first power signal based on an input power source includes: Controlling the power factor correction unit to generate a first voltage signal based on an input power supply; Controlling the power factor correction unit to determine a voltage error value based on the first voltage signal and a preset reference voltage signal; Controlling the power factor correction unit to perform proportional-integral regulation on the voltage error value to obtain a first output value; Controlling the power factor correction unit to multiply the first output value by the absolute value of the sampled voltage signal to obtain a second output value; Controlling the power factor correction unit to determine a first trigger signal based on a comparison result between the first current signal and the second output value; The power factor correction unit is controlled to perform zero-crossing detection on the third current signal based on a preset reference voltage signal to output a second trigger signal.

[0017] In a third aspect, an electronic device is also proposed, including a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used by the processor to execute the motor control method of the range hood as described above when the processor is running.

[0018] In a fourth aspect, a storage medium is also proposed, on which program instructions are stored, and the program instructions are used to execute the motor control method of the range hood as described above when running.

[0019] In a fifth aspect, a range hood is also provided, comprising: Electronic equipment as described above; and / or The motor control system of the range hood as described above.

[0020] In the above technical solution, after the input power supply is amplified by the power factor correction unit, a DC signal with a larger voltage value can be obtained, and the DC signal is used to provide energy for the subsequent motor drive, so that the vector control of the motor is based on the bus voltage, such as 380V, and is no longer limited to the rectified voltage value of 110V or 220V, so that the motor control system is suitable for power supply systems with a wider range of voltage values, thereby improving the applicability and generalization of the motor control system.

[0021] The motor control system of the range hood of the present invention, other advantages, objectives and features of the present invention will be partially reflected through the following description, and will also be partially understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic block diagram of a motor control system of a range hood provided in an embodiment of the present application; Figure 2 A schematic block diagram of a power factor correction unit provided in an embodiment of the present application; Figure 3 A schematic diagram of a corresponding relationship between a driving signal of a gallium nitride transistor and a current signal of a first inductor provided in an embodiment of the present application; Figure 4 A waveform comparison diagram of a motor control system before and after adding a power factor correction unit provided in an embodiment of the present application; Figure 5 A schematic circuit diagram of a power factor correction unit provided in an embodiment of the present application; Figure 6 A schematic flow chart of a motor control method for a range hood provided in an embodiment of the present application; Figure 7A schematic block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0026] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0028] Variable frequency range hoods are widely favored by the market and customers due to their good smoke extraction effect and low noise. With the advancement and development of science and technology, users have higher and higher requirements for fan air volume and performance, and thus have higher requirements for the electronic control system circuit. As the performance of range hoods continues to improve, the power requirements for variable frequency inverters are increasing. The power grid voltage in different regions and countries can be divided into two AC voltage standards: 110V and 220V. Since the variable frequency fan drive needs to collect bus voltage feedback control and undervoltage protection, as the output power increases, the bus ripple voltage and ripple current increase. For different power supply systems, the software and hardware of the range hood electronic control system need to be selected and signal processed differently.

[0029] In order to solve the above technical problem, according to the first aspect of the present application, a motor control system for a range hood is proposed. Figure 1 A schematic block diagram of a motor control system of a range hood provided in an embodiment of the present application. Figure 1As shown, the motor control system may include: an electrically connected power module 100 and an inverter module 200. The power module 100 includes a power factor correction unit 110. The power factor correction unit (Power Factor Correction, PFC) may include an active PFC and a passive PFC. The power factor correction unit 110 is electrically connected to the inverter module 200. The power factor correction unit 110 is used to amplify the voltage of the input power DC to generate a first power signal D1, and output the first power signal D1 to the inverter module 200, wherein the power factor correction unit 110 may include a gallium nitride transistor. The inverter module 200 is electrically connected to the motor 300, and the inverter module 200 is used to drive the motor 300 under the action of the first power signal D1.

[0030] Exemplarily, the input power supply may be any DC power supply signal that enables the power factor correction unit to work effectively, and may be obtained through user input or other unit or module input, etc., which is not limited here. In some embodiments, the motor control system may include: an AC power supply, an electromagnetic compatibility filter module, and a rectifier filter module. Among them, one end of the electromagnetic compatibility filter module is electrically connected to the AC power supply, the other end of the electromagnetic compatibility filter module is electrically connected to the rectifier filter module, the rectifier filter module is electrically connected to the power factor correction unit, and the rectifier filter module is used to provide a DC signal to the power factor correction unit, that is, Figure 1The input power supply DC shown. Exemplarily, the AC power supply can be used to input an AC signal of, for example, 110V or 220V to the electromagnetic compatibility filter module, and the electromagnetic compatibility filter module can be used to eliminate the electromagnetic interference and spark interference generated by the inductive load of the rear-stage motor during power on and power off. It should be noted that electromagnetic interference can include conducted interference, radiated interference, common impedance coupling, and inductive coupling. Corresponding solutions can be adopted for different forms of interference. For example, conducted interference can be reduced by filtering, wherein filtering can include capacitor filtering, inductor filtering, and inductor-capacitor (LC) filtering. Radiated interference can be reduced by grounding or shielding, which will not be described in detail here. The electromagnetic compatibility filter module can ensure that the motor can work stably. The output end of the electromagnetic compatibility filter module is current-connected to the rectifier filter module, and the rectifier filter module may include an electrically connected rectifier circuit and a filter circuit, the rectifier circuit is used to rectify the input AC power, and the filter circuit is used to filter the rectified electrical signal, and transmit the filtered DC power to the power factor correction unit. Among them, the rectifier circuit may include a full-bridge rectifier circuit, a half-bridge rectifier circuit and a bridge rectifier circuit, etc., and the filter circuit may include a capacitor filter circuit, an inductor filter circuit and an LC filter circuit, etc. The specific circuit structure of the rectifier and filter module is not limited in the present application. Taking the above-mentioned 220V AC as an example, the rectifier circuit can rectify it into, for example, 310V DC, and then the filter circuit filters the 310V DC, and then inputs the filtered 310V DC signal to the power factor unit. The power factor correction unit can perform voltage amplification processing on the 310V DC signal, for example, boosting the 310V DC to 380V DC, and the 380V DC is Figure 1 The first power signal D1 is shown. Afterwards, the first power signal D1 is transmitted to the inverter module 200, and the first power signal D1 is used to drive the inverter module 200 to generate high-frequency alternating voltage and current to achieve motor drive. In some embodiments, the grid voltage fluctuation range is ±20%, so the full voltage range of the input AC voltage of the present application has a root mean square average (RMS) of 85-265V, that is, the input AC The maximum voltage is 265V. After rectification and filtering, the voltage is To ensure the working efficiency of PFC, the PFC output voltage is controlled at about 380V to avoid excessive voltage causing greater electrical stress on the subsequent electronic devices.

[0031] It should be noted that most smoke exhaust fans use metal-oxide semiconductor field-effect transistors (MOSFET) or insulated-gate bipolar transistors (IGBT) as semiconductor power device switches in the inverter module, such as silicon (Si) MOS tubes. As the performance of smoke exhaust fans continues to improve, the requirements for motor driving capabilities are getting higher and higher. The higher the motor operating power, the greater the current flowing through the motor phase, the greater the loss generated by the motor power inverter drive module, and the more serious the heating of the power device. That is, as the motor load increases, the current flowing through the Si MOS tube increases, increasing the switching loss and conduction loss of the switch tube, resulting in increased power of the power device and severe heating. To solve this problem, the temperature rise problem can be solved by adding a heat sink, but it will also bring about problems such as increased electronic control costs and increased hardware size. With the development of power devices, gallium nitride (GaN) transistors are used as semiconductor power devices. GaN transistors have the advantages of high electron mobility, large bandgap, fast switching speed and low conduction loss. Due to the difference in material properties, the reverse conduction voltage of GaN transistors is usually higher than that of traditional Si transistors. Under the same conditions, the dead time set by GaN transistors is shorter than that of Si transistors, so the dead time loss is small. Using gallium nitride (GaN) transistors to replace the original Si MOS tubes, GaN has the advantages of faster switching speed, lower conduction loss, and no reverse recovery time, which can reduce device losses, solve the problem of excessive temperature rise of device power, and improve the working efficiency of the system. In some embodiments, in order to reduce the common-mode and differential-mode interference generated by the switch of gallium nitride transistors, the path for current return in the inverter module is separated, the drive module is set close to the gallium nitride transistor, and the signal line loop of the drive module is shortened as much as possible to reduce the interference source from radiating interference to the drive signal loop. When designing the circuit board, the source and drain pads of the gallium nitride transistor can be assisted in heat dissipation by means of large-area copper plating or window opening and tinning. The gallium nitride transistor in the inverter module can be regarded as a switch for controlling strong electricity. By controlling the conduction and cutoff of the gallium nitride transistor, high-frequency alternating voltage and current can be generated in the circuit to drive the motor. The motor can be driven by the control module to drive the impeller to rotate, generating negative pressure in the range hood flue to discharge the oil smoke. The control module is also used to convert the input AC power into electrical energy to drive the motor, lighting and heating tube load of the range hood. The range hood can also include a cleaning heating tube, which is driven by the control module and is used to clean the oil smoke stains on the impeller of the range hood.

[0032] Gallium nitride transistors can also be used as switch tubes in PFC, which can also reduce PFC losses, reduce PFC heating temperature, and improve system efficiency. For ease of description, the switch tubes mentioned below are all gallium nitride transistors.

[0033] In the above technical solution, after the input power is amplified by PFC, a DC signal with a larger voltage value can be obtained, and the DC signal is used to provide energy for the subsequent inverter module, so that the vector control of the motor is based on the bus voltage, such as 380V, and is no longer limited to the voltage value after rectification of 110V or 220V, so that the motor control system is suitable for power supply systems with a wider range of voltage values, improving the applicability and generalization of the motor control system. In addition, since GaN devices are used as switch tubes in PFC, the switching loss and conduction loss of the device are reduced, and the system working efficiency is improved.

[0034] In the motor control system, the input AC power is converted into DC power through the rectifier and filter circuit. As the load increases, the output ripple voltage and ripple current increase, which has an adverse effect on the stable control of the variable frequency motor. The DC power can be stored in the bus capacitor to provide energy for the subsequent inverter circuit to drive the motor. The motor is an inductive load. When the motor works in a high-power state, the load current and the input voltage are not synchronized, resulting in serious distortion of the input current and serious harmonic interference. The power factor PF value generally does not exceed 0.7. At the same time, a large ripple current is generated on the bus capacitor, which affects the life and reliability of the capacitor and the reliability of the motor drive.

[0035] Figure 2 A schematic block diagram of a power factor correction unit provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the power factor correction unit 110 includes: a switch tube T1, a first inductor 111 and an analog control subunit 112. One end of the first inductor 111 is electrically connected to the input power supply DC, and the other end of the first inductor 111 is electrically connected to the first electrode S of the switch tube T1. The first input terminal 1 of the analog control subunit 112 is electrically connected to the first node P1, and the first node P1 is electrically connected to the first electrode S and the second electrode D of the switch tube T1 respectively, the second input terminal 2 of the analog control subunit 112 is electrically connected to the second electrode D of the switch tube T1, and the third input terminal 3 of the analog control subunit 112 is electrically connected to the first inductor 111. The analog control subunit 112 is used to control the conduction or cutoff of the switch tube T1, that is, the output terminal 4 of the analog control subunit 112 is electrically connected to the gate G of the switch tube T1. Among them, in Figure 2 In the illustrated embodiment, the source S is the first electrode, and the drain D is the second electrode. In some embodiments, the first electrode and the second electrode may be swapped.

[0036] For example, Figure 2 As shown, the switch tube T1 can be used as a switch tube to control the charging and discharging of the first inductor 111. For example, at the beginning of each switching cycle of the switch tube T1, the analog control subunit 112 can control the switch tube T1 to be turned on, wherein the drive signal of the switch tube T1 can be represented by Vgs. That is, when the analog control subunit 112 provides a drive signal with Vgs being a high level to the switch tube T1, the switch tube T1 is turned on.

[0037] Figure 3 A schematic diagram of the corresponding relationship between a driving signal of a gallium nitride transistor and a current signal of a first inductor provided in an embodiment of the present application. Figure 2 and Figure 3 As shown, when Vgs is a high-level signal, the switch tube T1 is turned on, the first inductor 111 starts to store energy, and the inductor current iL rises linearly. When the inductor current iL of the first inductor 111 reaches the preset peak value iL_pk, the analog control subunit 112 provides a driving signal with Vgs being a low level to the switch tube T1, the switch tube T1 is turned off, the first inductor 111 discharges through the freewheeling diode of the switch tube T1, and the inductor current iL decreases linearly. When the inductor current iL drops to zero, the analog control subunit 112 provides a driving signal with Vgs being a high level to the switch tube T1 again, controls the switch tube T1 to be turned on again, and starts the next switching cycle. Among them, Figure 3 The iL_avg shown may represent the average current of the first inductor 111. That is, when the switch tube is turned on, the inductor current rises, and when the inductor current rises to be equal to the input voltage feedback signal, the switch tube is turned off and the inductor current decreases; when the inductor current decreases to zero, the switch tube is turned on again and the next switching cycle begins.

[0038] In some embodiments, Figure 2As shown, the first input terminal 1 of the analog control subunit 112 is used to receive the first voltage signal V1 between the first electrode S and the second electrode D, the second input terminal 2 of the analog control subunit 112 is used to receive the first current signal I1 flowing through the second electrode D, and the third input terminal 3 of the analog control subunit 112 is used to receive the second current signal I2 flowing through the first inductor 111. The analog control subunit 112 is used to generate a first control signal K1 based on the first voltage signal V1, the first current signal I1 and the second current signal I2, and the first control signal is used to control the conduction or cutoff of the switch tube. It should be noted that the analog control subunit 112 can detect the output voltage of the switch tube T1 and the input current of the first inductor 111 through the electrical signals input from the three input terminals, thereby generating a corresponding driving signal, that is, the first control signal K1, so as to use K1 to control the conduction time of the switch tube T1, maintain a stable output voltage, realize the current waveform adjustment, make it synchronized with the voltage waveform, reduce the reactive power, thereby improving the power factor, reducing the harmonic components in the current, reducing the interference to the power grid, and improving the energy utilization efficiency of the system.

[0039] Figure 4 The waveform comparison diagram of the motor control system before and after adding the power factor correction unit provided in the embodiment of the present application is shown. Figure 4 The right picture shows the waveform of the motor control system after adding PFC. Figure 4 The left figure is the waveform diagram of the motor control system without PFC, see Figure 4 The left and right figures show that when the original system is fully loaded with rectification and filtering, the bus output voltage fluctuates around 80V, the current waveform is obviously not synchronized with the voltage, and the current peak-to-peak value is as high as 8A. However, in the new system with PFC added, after PFC voltage regulation, under the same output load conditions, the bus output 380V voltage fluctuation peak is around 17V, the input current Iac is synchronized with the input voltage Vac, and the current peak-to-peak value is 2.7A. The current correction advantage is obvious. Figure 4 From the circled parts in the left and right figures, we can see that after adding PFC, the harmonic components of the current in the motor control system are reduced, and no current distortion occurs. In addition, the output voltage is more stable, and the bus ripple current and ripple voltage are significantly reduced.

[0040] In some implementations, a motor control system may include a sampling module and a control module. Figure 5 A schematic circuit diagram of a power factor correction unit provided in an embodiment of the present application is shown in FIG. Figure 5As shown, the analog control subunit 112 may include: a first comparator C1, a second comparator C2, a signal conditioning circuit 510 and a trigger 520. The first input terminal A1 of the first comparator C1 is electrically connected to the drain D, the second input terminal A2 of the first comparator C1 is electrically connected to the output terminal of the signal conditioning circuit 510, the first input terminal of the signal conditioning circuit 510 is electrically connected to the first node P1, the second input terminal of the signal conditioning circuit 510 is electrically connected to the sampling module Vin, the third input terminal of the signal conditioning circuit 510 is electrically connected to the control module 400, the output terminal B1 of the first comparator C1 is electrically connected to the first input terminal R of the trigger 520, and the sampling module Vin is used to sample the input power supply DC. The first input terminal of the signal conditioning circuit 510 is used to receive the first voltage signal V1, the second input terminal of the signal conditioning circuit 510 is used to receive the voltage sampling signal Vin of the input power supply DC, and the third input terminal of the signal conditioning circuit 510 is used to receive the preset reference voltage signal Vref, wherein the preset reference voltage signal Vref is generated by the control module 400 in response to the user's input operation, and the preset reference voltage signal Vref can be reasonably set according to experience or actual needs. The functions of the control module include collecting signal peripherals, vector calculation, outputting driving signals, and driving the load of the smoke machine.

[0041] The signal conditioning circuit 510 is used to generate a third current signal iref based on the first voltage signal V1, the voltage sampling signal Vin and the preset reference voltage signal Vref, and output the third current signal iref to the second input terminal A2 of the first comparator C1. The first input terminal A1 of the first comparator C1 is used to receive the first current signal I1, wherein the first current signal I1 may be a sampling current isw obtained by sampling the output current of the drain D of the switch tube. The first comparator C1 is used to output a first trigger signal under the action of the first current signal I1 (or isw) and the third current signal iref. The first input terminal A3 of the second comparator C2 is electrically connected to the first inductor L, the second input terminal A4 of the second comparator C2 is electrically connected to the control module 400, and the output terminal B2 of the second comparator C2 is electrically connected to the second input terminal s of the trigger 520. The first input terminal A3 of the second comparator C2 is used to receive the second current signal I2, that is, the inductor current iL, and the second input terminal A4 of the second comparator C2 is used to receive the preset reference voltage signal Vref. The second comparator C2 is used to output a second trigger signal under the action of the second current signal iL and the preset reference voltage signal Vref. The first output terminal / Q and the second output terminal Q of the trigger 520 are both electrically connected to the gate G of the switch tube T1. The trigger is used to output a first control signal K1 under the action of the first trigger signal and the second trigger signal, and use K1 to control the conduction or cutoff of the switch tube T1.

[0042] For example, Figure 5As shown, in the signal conditioning circuit 510, the voltage error value can be obtained by subtracting V1 from Vref. . Afterwards Proportional integral (PI) adjustment can be performed to obtain a first output value PI. The first output value PI is multiplied by the absolute value |Vin| of Vin to obtain a second output value, that is, to obtain a third current signal iref. iref is used as the reference value of isw, and the comparison result obtained after comparison with isw is the first trigger signal. The first comparator C1 can transmit the first trigger signal to the first input terminal of the trigger 520. The signals received by the two input terminals of the second comparator C2 are iL and Vref, respectively. Comparing iL with Vref can detect the inductance zero-crossing signal, thereby transmitting the zero-crossing detection result to the second input terminal of the trigger 520, that is, the second trigger signal. Exemplarily, when isw is greater than iref, the trigger 520 can output a low-level first control signal K1 under the action of the first trigger signal, thereby controlling the switch tube T1 to be cut off. Combined with the above, at this time, the first inductor L is in a discharge state. When it is detected that iL of the first inductor L passes through zero, the trigger 520 can output a high-level first control signal K1 under the action of the second trigger signal, thereby controlling the switch tube T1 to be turned on. Combined with the above, the first inductor L is in a charging state at this time. In this way, the current flowing through the inductor can be controlled to be synchronously adjusted with the voltage modulation envelope signal, and the current and voltage form a sine wave with the same frequency and phase. The reactive power of the system is reduced, thereby improving the power factor to, for example, above 0.95, reducing the harmonic components in the current, reducing interference to the power grid, and improving the energy utilization efficiency of the system.

[0043] In some embodiments, Figure 5 As shown, the power factor correction unit 110 may include a first diode Q1, a first capacitor Cout and a load 530. The anode of the first diode Q1 is electrically connected to the first inductor L, and the cathode of the first diode Q1 is electrically connected to the first capacitor Cout and the load 530 via the second node P2, respectively, and the first capacitor Cout and the load 530 are connected in parallel.

[0044] For example, Figure 5 As shown, Q1 can be regarded as the freewheeling diode of the switch tube T1. When the first inductor L is in the discharge state, iL can release energy to Cout and the load 530 through the freewheeling diode, and iL decreases linearly. According to the unidirectional conduction characteristic of the diode, it can be ensured that the current is allowed to flow to Cout and the load 530 only when the first inductor L is in the discharge state.

[0045] In some embodiments, Figure 5As shown, the power factor correction unit 110 may include a second diode Q2. An anode of the second diode Q2 is electrically connected to the first inductor L, and a cathode of the second diode Q2 is electrically connected to the second node P2.

[0046] For example, Figure 5 As shown, Q2 is connected in parallel at both ends of Q1. It should be noted that Q1 can be a fast recovery diode with a short reverse recovery time, but weak surge current resistance. Q2 can be a slow recovery diode with strong surge current resistance. At the moment of power-on, the surge current is large, and Q2 can reduce the surge current on Q1 to protect Q1.

[0047] In some embodiments, the motor control system may further include a frequency conversion module. The power module may include a voltage adjustment unit, which is electrically connected to the PFC, the control module, and the frequency conversion module, respectively, and is used to generate a second power signal based on the first power signal transmitted from the PFC to provide the second power signal to the control module and the frequency conversion module, wherein the voltage adjustment unit includes a gallium nitride transistor.

[0048] Exemplarily, the voltage adjustment unit can receive a first power signal from the PFC. As mentioned above, the first power signal is an electrical signal with a high voltage, such as 380V. The voltage adjustment unit can make corresponding voltage adjustments to the first power signal according to the working parameters of the control module and the frequency conversion module, thereby generating and transmitting the corresponding second power signal to the control module and the frequency conversion module. For example, the voltage adjustment module can transmit a second power signal with a voltage of, for example, 12V or 5V to the control module. The voltage adjustment module can transmit a second power signal with a voltage of, for example, 15V to the frequency conversion module. Combined with the foregoing, in order to reduce system power and meet temperature rise requirements, the switch tube in the voltage adjustment module can also use gallium nitride transistors.

[0049] According to the second aspect of the present application, a motor control method for a range hood is also proposed, which is applied to the motor control system of the range hood as described above. Figure 6 A schematic flow chart of a motor control method for a range hood provided in an embodiment of the present application. Figure 6 As shown, the control method may include: Step S610, controlling a power factor correction unit to generate a first power signal based on an input power supply to provide the first power signal to an inverter module, wherein the power factor correction unit includes a gallium nitride transistor; Step S620: Control the inverter module to drive the motor under the action of the first power signal.

[0050] In some embodiments, when the motor control system of the range hood includes a first inductor, the method further includes: acquiring a second current signal of the first inductor; Performing signal sampling on the input power supply to obtain a sampled voltage signal; Based on the second current signal and the sampled voltage signal, the gallium nitride transistor in the power factor correction unit is controlled to be turned on or off.

[0051] In some embodiments, controlling the power factor correction unit to generate a first power signal based on an input power source includes: Controlling the power factor correction unit to generate a first voltage signal based on an input power supply; Controlling the power factor correction unit to determine a voltage error value based on the first voltage signal and a preset reference voltage signal; Controlling the power factor correction unit to perform proportional-integral regulation on the voltage error value to obtain a first output value; Controlling the power factor correction unit to multiply the first output value by the absolute value of the sampled voltage signal to obtain a second output value; Controlling the power factor correction unit to determine a first trigger signal based on a comparison result between the first current signal and the second output value; The power factor correction unit is controlled to perform zero-crossing detection on the third current signal based on a preset reference voltage signal to output a second trigger signal.

[0052] Therefore, after the input power supply is amplified by the power factor correction unit, a DC signal with a larger voltage value can be obtained, and the DC signal is used to provide energy for the subsequent motor drive, so that the vector control of the motor is based on the bus voltage, such as 380V, and is no longer limited to the voltage value after rectification of 110V or 220V, so that the motor control system is suitable for power supply systems with a wider range of voltage values, and the applicability and generalization of the motor control system are improved. In addition, adding a power factor correction unit to the input stage of the motor control system can realize the adjustment of the current waveform, so that it is synchronized with the voltage waveform, and the reactive power is reduced, thereby improving the power factor, reducing the harmonic components in the current, reducing interference with the power grid, and improving the energy utilization efficiency of the system. Most of the traditional home appliance industry uses Si MOS tubes or IGBTs as semiconductor power device switch tubes. As the output load increases, the current flowing through the power device MOS and IGBT increases, increasing the switching loss and conduction loss of the switch tube, resulting in an increase in the power of the power device and severe heat generation. It is usually necessary to add a heat sink to the power device to solve the temperature rise problem, resulting in the disadvantages of increased electronic control costs and increased hardware size. To this end, GaN transistors are used to replace the original Si MOS tubes or IGBTs. GaN has the advantages of faster switching speed, lower conduction loss and no reverse recovery time, which can reduce device losses, solve the problem of temperature rise caused by excessive device power, and improve the working efficiency of the electronic control system. There is no need to add an additional heat sink, which improves production efficiency and saves production costs.

[0053] According to a third aspect of the present application, an electronic device is also provided. Figure 7 A schematic block diagram of an electronic device provided in an embodiment of the present application. Figure 7 As shown, the electronic device 700 may include a processor 710 and a memory 720. The memory 720 stores computer program instructions, which are used by the processor 710 to execute the motor control method of the range hood as described above when the processor 710 is running.

[0054] According to a fourth aspect of the present application, a storage medium is also proposed, on which program instructions are stored, and the program instructions are used to execute the motor control method of the smoke machine as described above when running. The storage medium may include, for example, a storage component of a tablet computer, a hard disk of a computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0055] According to a fifth aspect of the present application, a range hood is further proposed, comprising: the electronic device as described above; and / or the motor control system of the range hood as described above.

[0056] A person of ordinary skill in the art may understand the motor control method, electronic device, storage medium and specific details and beneficial effects of the range hood by reading the above description of the motor control system of the range hood, which will not be elaborated here for the sake of brevity.

[0057] In the several embodiments provided in the present application, it should be understood that the disclosed devices and / or equipment can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0058] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0059] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0060] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0061] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor control system for a range hood, characterized in that: include: Electrically connected power modules and inverter modules; The power module includes a power factor correction unit, which is electrically connected to the inverter module, and is used to amplify the voltage of the input power to generate a first power signal, and output the first power signal to the inverter module, wherein the power factor correction unit includes a gallium nitride transistor; The inverter module is electrically connected to the motor, and is used to drive the motor under the action of the first power signal.

2. The motor control system of the range hood according to claim 1, characterized in that: The power factor correction unit includes: a first inductor and an analog control subunit, One end of the first inductor is electrically connected to the input power supply, and the other end of the first inductor is electrically connected to the first electrode of the gallium nitride transistor; The first input terminal of the analog control subunit is electrically connected to a first node, the first node is electrically connected to a first electrode and a second electrode of the gallium nitride transistor respectively, the second input terminal of the analog control subunit is electrically connected to the second electrode of the gallium nitride transistor, the third input terminal of the analog control subunit is electrically connected to the first inductor, and the analog control subunit is used to control the conduction or cutoff of the gallium nitride transistor, wherein the first electrode is one of the source and the drain of the gallium nitride transistor, and the second electrode is the other of the source and the drain of the gallium nitride transistor.

3. The motor control system of the range hood according to claim 2, characterized in that: The first input terminal of the analog control subunit is used to receive a first voltage signal between the first electrode and the second electrode, the second input terminal of the analog control subunit is used to receive a first current signal flowing through the second electrode, and the third input terminal of the analog control subunit is used to receive a second current signal flowing through the first inductor. The analog control subunit is used to generate a first control signal based on the first voltage signal, the first current signal and the second current signal, and the first control signal is used to control the conduction or cutoff of the gallium nitride transistor.

4. The motor control system of the range hood according to claim 3, characterized in that: Also includes: The sampling module and the control module, the analog control subunit includes: a first comparator, a second comparator, a signal conditioning circuit and a trigger, The first input terminal of the first comparator is electrically connected to the second electrode, the second input terminal of the first comparator is electrically connected to the output terminal of the signal conditioning circuit, the first input terminal of the signal conditioning circuit is electrically connected to the first node, the second input terminal of the signal conditioning circuit is electrically connected to the sampling module, the third input terminal of the signal conditioning circuit is electrically connected to the control module, the output terminal of the first comparator is electrically connected to the first input terminal of the trigger, and the sampling module is used to sample the input power supply; The first input terminal of the second comparator is electrically connected to the first inductor, the second input terminal of the second comparator is electrically connected to the control module, and the output terminal of the second comparator is electrically connected to the second input terminal of the trigger; The first output terminal and the second output terminal of the trigger are both electrically connected to the gate of the gallium nitride transistor, and the trigger is used to control the conduction or cutoff of the gallium nitride transistor.

5. The motor control system of the range hood according to claim 4, characterized in that: The first input terminal of the signal conditioning circuit is used to receive the first voltage signal, the second input terminal of the signal conditioning circuit is used to receive the voltage sampling signal of the input power supply, and the third input terminal of the signal conditioning circuit is used to receive a preset reference voltage signal, wherein the preset reference voltage signal is generated by the control module in response to an input operation of a user, the signal conditioning circuit is used to generate a third current signal based on the first voltage signal, the voltage sampling signal and the preset reference voltage signal, and output the third current signal to the second input terminal of the first comparator, the first input terminal of the first comparator is used to receive the first current signal, and the first comparator is used to output a first trigger signal under the action of the first current signal and the third current signal; The first input terminal of the second comparator is used to receive the second current signal, the second input terminal of the second comparator is used to receive the preset reference voltage signal, and the second comparator is used to output a second trigger signal under the action of the second current signal and the preset reference voltage signal; The trigger is used to output the first control signal under the action of the first trigger signal and the second trigger signal.

6. The motor control system of the range hood according to claim 2, characterized in that: The power factor correction unit includes a first diode, a first capacitor and a load; The anode of the first diode is electrically connected to the first inductor, the cathode of the first diode is electrically connected to the first capacitor and the load respectively via a second node, and the first capacitor and the load are connected in parallel.

7. The motor control system of the range hood according to claim 6, characterized in that: The power factor correction unit includes a second diode, An anode of the second diode is electrically connected to the first inductor, and a cathode of the second diode is electrically connected to the second node.

8. The motor control system of the range hood according to claim 4, characterized in that: Also includes: frequency conversion module; The power supply module includes a voltage adjustment unit, which is electrically connected to the power factor correction unit, the control module and the frequency conversion module respectively. The voltage adjustment unit is used to generate a second power signal based on the first power signal transmitted from the power factor correction unit to provide the second power signal to the control module and the frequency conversion module, wherein the voltage adjustment unit includes a gallium nitride transistor.

9. The motor control system of the range hood according to claim 1, characterized in that: Also includes: An alternating current power supply, an electromagnetic compatibility filter module and a rectifier filter module, wherein one end of the electromagnetic compatibility filter module is electrically connected to the alternating current power supply, the other end of the electromagnetic compatibility filter module is electrically connected to the rectifier filter module, the rectifier filter module is electrically connected to the power factor correction unit, and the rectifier filter module is used to provide a direct current signal to the power factor correction unit.

10. A method for controlling a motor of a range hood, characterized in that: The motor control system applied to the range hood according to any one of claims 1 to 9, the control method comprising: controlling the power factor correction unit to generate the first power signal based on the input power to provide the first power signal to the inverter module, wherein the power factor correction unit includes a gallium nitride transistor; The inverter module is controlled to drive the motor under the action of the first power signal.

11. The motor control method of a range hood according to claim 10, characterized in that: In the case where the motor control system of the range hood includes a first inductor, the method further includes: Acquiring a second current signal of the first inductor; Performing signal sampling on the input power supply to obtain the sampled voltage signal; Based on the second current signal and the sampled voltage signal, the gallium nitride transistor in the power factor correction unit is controlled to be turned on or off.

12. The motor control method of a range hood according to claim 11, characterized in that: The controlling the power factor correction unit to generate the first power signal based on the input power includes: Controlling the power factor correction unit to generate a first voltage signal based on the input power supply; Controlling the power factor correction unit to determine a voltage error value based on the first voltage signal and a preset reference voltage signal; Controlling the power factor correction unit to perform proportional-integral regulation on the voltage error value to obtain a first output value; Controlling the power factor correction unit to multiply the first output value by the absolute value of the sampled voltage signal to obtain a second output value; controlling the power factor correction unit to determine a first trigger signal based on a comparison result between the first current signal and the second output value; The power factor correction unit is controlled to perform zero-crossing detection on the third current signal based on the preset reference voltage signal to output a second trigger signal.

13. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used by the processor to execute the motor control method of the range hood as claimed in any one of claims 10 to 12 when the processor is running.

14. A storage medium having program instructions stored thereon, wherein the program instructions are used to execute the motor control method for a range hood as claimed in any one of claims 10 to 12 when running.

15. A range hood, characterized in that: include: The electronic device as claimed in claim 13; and / or A motor control system for a range hood as claimed in any one of claims 1 to 9.

Images