Motor control system, method, related equipment and range hood

Abstract

The present invention provides a motor control system, method, related equipment, and range hood for a range hood. Relating to the field of electrical appliance technology, the motor control system includes: an electrically connected power module and an inverter module; the power module includes a power factor correction unit, which is electrically connected to the inverter module and configured to amplify the voltage of an input power source 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 a motor and configured to drive the motor under the action of the first power signal. This generates a DC signal with a higher voltage value, allowing the motor's vector control to be based on a bus voltage, such as 380V, rather than being limited to a rectified voltage of 110V or 220V. This makes the motor control system applicable to power systems with a wider range of voltage values, thereby improving the applicability and generalization of the motor control system.

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 set 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] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended 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:

[0006] Electrically connected power modules and inverter modules;

[0007] 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. The power factor correction unit includes a gallium nitride transistor.

[0008] The inverter module is electrically connected to the motor, and is used to drive the motor under the action of the first power supply signal.

[0009] In some embodiments, the power factor correction unit includes: a first inductor and an analog control subunit,

[0010] 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;

[0011] A 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. A second input terminal of the analog control subunit is electrically connected to the second electrode of the gallium nitride transistor. A third input terminal of the analog control subunit is electrically connected to the first inductor. The analog control subunit is configured to control the on / off state of the gallium nitride transistor. The first electrode is one of a source and a drain of the gallium nitride transistor, and the second electrode is the other of the source and the drain of the gallium nitride transistor.

[0012] 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.

[0013] In some embodiments, the device 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.

[0014] a first input terminal of the first comparator electrically connected to the second electrode, a second input terminal of the first comparator electrically connected to the output terminal of the signal conditioning circuit, a first input terminal of the signal conditioning circuit electrically connected to the first node, a second input terminal of the signal conditioning circuit electrically connected to the sampling module, a third input terminal of the signal conditioning circuit electrically connected to the control module, an output terminal of the first comparator electrically connected to the first input terminal of the trigger, and the sampling module is used to sample the input power supply;

[0015] 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;

[0016] 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.

[0017] In some embodiments, a first input terminal of the signal conditioning circuit is used to receive a first voltage signal, a second input terminal of the signal conditioning circuit is used to receive a voltage sampling signal of an input power supply, and a 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 a user input operation, 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 in response to the first current signal and the third current signal;

[0018] 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;

[0019] The trigger is used to output a first control signal under the action of a first trigger signal and a second trigger signal.

[0020] In some embodiments, the power factor correction unit includes a first diode, a first capacitor, and a load;

[0021] The anode of the first diode is electrically connected to the first inductor, and the cathode of the first diode is electrically connected to the first capacitor and the load via the second node, respectively. The first capacitor and the load are connected in parallel.

[0022] In some embodiments, the power factor correction unit includes a second diode,

[0023] 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.

[0024] In some embodiments, the further comprising: a frequency conversion module;

[0025] 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 the 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.

[0026] In some embodiments, further comprising:

[0027] 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.

[0028] 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:

[0029] 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;

[0030] The inverter module is controlled to drive the motor under the action of the first power supply signal.

[0031] In some embodiments, when the motor control system of the range hood includes a first inductor, the method further includes:

[0032] obtaining a second current signal of the first inductor;

[0033] Performing signal sampling on the input power supply to obtain a voltage sampling signal;

[0034] Based on the second current signal and the voltage sampling signal, the gallium nitride transistor in the power factor correction unit is controlled to be turned on or off.

[0035] In some embodiments, controlling the power factor correction unit to generate a first power signal based on an input power source includes:

[0036] controlling the power factor correction unit to generate a first voltage signal based on an input power supply;

[0037] Controlling the power factor correction unit to determine a voltage error value based on the first voltage signal and a preset reference voltage signal;

[0038] Controlling the power factor correction unit to perform proportional-integral regulation on the voltage error value to obtain a first output value;

[0039] controlling the power factor correction unit to multiply the first output value by the absolute value of the voltage sampling signal to obtain a second output value;

[0040] controlling the power factor correction unit to determine a first trigger signal based on a comparison result of the first current signal and the second output value;

[0041] 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.

[0042] In a third aspect, an electronic device is proposed, comprising 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.

[0043] In a fourth aspect, a storage medium is also proposed, on which program instructions are stored. The program instructions are used to execute the motor control method of the range hood as described above when running.

[0044] In a fifth aspect, a range hood is also proposed, comprising:

[0045] electronic devices as described above; and / or

[0046] The motor control system of the range hood as described above.

[0047] 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.

[0048] The motor control system of the range hood of the present invention, and other advantages, objectives and features of the present invention will be partially reflected in 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

[0049] 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.

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered limiting of the present application. Throughout the accompanying drawings, the same reference symbols denote the same components. In the accompanying drawings:

[0052] Figure 1 A schematic block diagram of a motor control system for a range hood provided in an embodiment of the present application;

[0053] Figure 2 A schematic block diagram of a power factor correction unit provided in an embodiment of the present application;

[0054] 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;

[0055] Figure 4 A waveform comparison diagram of the motor control system before and after adding a power factor correction unit according to an embodiment of the present application;

[0056] Figure 5 A schematic circuit diagram of a power factor correction unit provided in an embodiment of the present application;

[0057] Figure 6 A schematic flow chart of a motor control method for a range hood provided in an embodiment of the present application;

[0058] Figure 7 A schematic block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0060] 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 numbers used in this way can be interchanged 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 variations thereof 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 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 embodiments described are only some embodiments of the present application, not all embodiments.

[0061] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0062] Variable frequency range hoods are widely favored by the market and customers for their good exhaust 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.

[0063] In order to solve the above technical problems, according to the first aspect of the present application, a motor control system for a range hood is proposed. Figure 1 This is a schematic block diagram of a motor control system for a range hood provided in an embodiment of the present application. For example, Figure 1 As shown, the motor control system may include: a power module 100 and an inverter module 200 that are electrically connected. The power module 100 includes a power factor correction unit 110. The power factor correction unit (PFC) may include active PFC and passive PFC. The power factor correction unit 110 is electrically connected to the inverter module 200. The power factor correction unit 110 is configured 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. 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 configured to drive the motor 300 under the action of the first power signal D1.

[0064] Exemplarily, the input power supply can be any DC power supply signal that enables the power factor correction unit to work effectively, and can 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 is DC. For example, an AC power supply can be used to input a 110V or 220V AC signal to the EMC filter module. The EMC filter module is used to eliminate electromagnetic interference and spark interference generated by the inductive load of the downstream motor during power on and off. It should be noted that electromagnetic interference can include conducted interference, radiated interference, common impedance coupling, and inductive coupling. Different solutions can be used for different interference types. For example, conducted interference can be reduced through filtering, which can include capacitor filtering, inductor filtering, and inductor-capacitor (LC) filtering. Radiated interference can be reduced through grounding or shielding, which are not described in detail here. The EMC filter module ensures stable operation of the motor. The output of the EMC filter module is galvanically connected to the rectifier and filter module. The rectifier and filter module can include a rectifier circuit and a filter circuit electrically connected. 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 this application is 85-265V, that is, the input AC The maximum voltage is 265V, and the voltage after rectification and filtering is To ensure the working efficiency of PFC, the PFC output voltage is controlled at around 380V to avoid excessive voltage causing greater electrical stress on subsequent electronic devices.

[0065] It should be noted that most range hoods use metal-oxide-semiconductor field-effect transistors (MOSFETs) or insulated-gate bipolar transistors (IGBTs), such as silicon (Si) MOSFETs, as the semiconductor power switching devices in the inverter module. As range hood performance continues to improve, the demand for motor drive capability is increasing. Higher motor power leads to greater phase currents flowing through the motor, resulting in greater losses in the motor power inverter drive module and more severe heat generation in the power devices. Specifically, as motor load increases, the current flowing through the Si MOSFETs increases, increasing switching and conduction losses in the switches, leading to increased power consumption and significant heat generation. While heat generation can be addressed by adding a heat sink, this increases electronic control costs and hardware size. With the development of power devices, gallium nitride (GaN) transistors are being adopted as semiconductor power devices. GaN transistors offer advantages such as high electron mobility, a wide bandgap, fast switching speeds, and low conduction losses. Due to differences in material properties, the reverse conduction voltage of GaN transistors is typically higher than that of traditional Si transistors. Under the same conditions, the dead time set for GaN transistors is shorter than that of Si transistors, resulting in lower dead time losses. Using gallium nitride (GaN) transistors to replace existing Si MOS transistors offers advantages such as faster switching speeds, lower conduction losses, and no reverse recovery time. This reduces device losses, addresses the issue of temperature rise caused by excessive device power, and improves system efficiency. In some implementations, to reduce the common-mode and differential-mode interference generated by GaN transistor switching, the current return paths in the inverter module are separated, the driver module is positioned close to the GaN transistor, and the signal line loop of the driver module is shortened as much as possible to reduce the amount of interference radiated from interference sources coupling into the drive signal loop. During circuit board design, the source and drain pads of the GaN transistor can be treated with large-area copper plating or tinning with windows to aid in heat dissipation. The GaN transistors in the inverter module can be thought of as switches for controlling high-voltage electricity. By controlling the on and off states of the GaN transistors, high-frequency alternating voltage and current are generated in the circuit, driving the motor. The motor is driven by the control module, rotating the impeller and generating negative pressure in the range hood duct to expel oil smoke. The control module also converts the input AC power into electrical energy to drive the range hood's motor, lighting, and heating element. The range hood can also include a cleaning heater, driven by the control module, to clean oil smoke stains from the impeller.

[0066] Gallium nitride transistors can also be used as switching transistors in PFC, which can also reduce PFC losses, lower PFC temperature rise, and improve system efficiency. For ease of description, the switching transistors mentioned below are all gallium nitride transistors.

[0067] In the above technical solution, PFC amplifies the input power voltage to generate a DC signal with a higher voltage. This DC signal is used to provide energy for the subsequent inverter module, enabling motor vector control to be based on the bus voltage, for example, 380V, rather than being limited to the rectified voltage of 110V or 220V. This makes the motor control system applicable to power systems with a wider range of voltage values, improving its applicability and generalization. Furthermore, the use of GaN devices as switching transistors in the PFC reduces switching and conduction losses, thereby improving system efficiency.

[0068] In motor control systems, input AC power is converted to DC power via rectifier and filter circuits. As the load increases, the output ripple voltage and ripple current increase, adversely affecting the stable control of variable-frequency motors. DC energy can be stored in bus capacitors to provide energy for the subsequent inverter circuits to drive the motor. However, motors are inductive loads. When operating at high power, the load current and input voltage are out of sync, resulting in severe input current distortion and harmonic interference, with power factors typically below 0.7. This also generates high ripple current in the bus capacitors, affecting their lifespan and reliability, and ultimately the reliability of the motor drive.

[0069] Figure 2 A schematic block diagram of a power factor correction unit provided in an embodiment of the present application is shown, for example, as 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, Figure 2 In the embodiment shown, 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 can be switched.

[0070] For example, Figure 2 As shown, the switch T1 can function as a switch to control the charging and discharging of the first inductor 111. For example, at the beginning of each switching cycle of the switch T1, the analog control subunit 112 can control the switch T1 to be turned on. The drive signal for the switch T1 can be represented by Vgs. Specifically, when the analog control subunit 112 provides a drive signal with a high level of Vgs to the switch T1, the switch T1 is turned on.

[0071] Figure 3 A schematic diagram of the corresponding relationship between the driving signal of a gallium nitride transistor and the current signal of a first inductor provided in an embodiment of the present application. For example, 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 increases linearly. When the current iL of the first inductor 111 reaches the preset peak value iL_pk, the analog control subunit 112 provides a drive 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 again provides a drive signal with Vgs being a high level to the switch tube T1, controlling the switch tube T1 to turn on again and start the next switching cycle. Figure 3 The illustrated iL_avg may represent the average current of the first inductor 111. That is, when the switch is turned on, the inductor current increases. When the inductor current increases to equal the input voltage feedback signal, the switch is turned off, and the inductor current decreases. When the inductor current decreases to zero, the switch is turned on again, and the next switching cycle begins.

[0072] In some embodiments, as Figure 2As shown, the first input terminal 1 of the analog control subunit 112 is used to receive a 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 a first current signal I1 flowing through the second electrode D. The third input terminal 3 of the analog control subunit 112 is used to receive a 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. 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 drive signal, namely the first control signal K1. K1 is then used to control the conduction time of the switch tube T1 to maintain a stable output voltage, thereby adjusting the current waveform to synchronize it with the voltage waveform, reducing reactive power, thereby improving the power factor, reducing the harmonic components in the current, reducing interference with the power grid, and improving the energy efficiency of the system.

[0073] Figure 4 This is a 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. For example, 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 As can be seen from the left and right figures, when the original system is fully loaded with rectification and filtering, the bus output voltage fluctuates around 80V, the current waveform is significantly out of sync with the voltage, and the peak-to-peak current is as high as 8A. However, with the new system that has added PFC, 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 peak-to-peak current is 2.7A. The current correction advantage is obvious. Figure 4 As can be seen from the circled areas in the left and right figures, after adding PFC, the harmonic components of the current in the motor control system are reduced, eliminating current distortion. Furthermore, the output voltage is more stable, and the bus ripple current and ripple voltage are significantly reduced.

[0074] 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. For example, 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. A first input terminal A1 of the first comparator C1 is electrically connected to the drain D, a second input terminal A2 of the first comparator C1 is electrically connected to the output terminal of the signal conditioning circuit 510, a first input terminal of the signal conditioning circuit 510 is electrically connected to a first node P1, a second input terminal of the signal conditioning circuit 510 is electrically connected to a sampling module Vin, a third input terminal of the signal conditioning circuit 510 is electrically connected to the control module 400, an output terminal B1 of the first comparator C1 is electrically connected to a 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 of the signal conditioning circuit 510 is used to receive a first voltage signal V1. The second input of the signal conditioning circuit 510 is used to receive a voltage sampling signal Vin of the input power supply DC. The third input of the signal conditioning circuit 510 is used to receive a preset reference voltage signal Vref. The preset reference voltage signal Vref is generated by the control module 400 in response to user input and can be appropriately set based on experience or actual needs. The control module's functions include signal acquisition, vector calculation, outputting drive signals, and driving the range hood load.

[0075] The signal conditioning circuit 510 is configured to generate a third current signal iref based on the first voltage signal V1, the voltage sampling signal Vin, and a 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 configured to receive the first current signal I1, which may be a sampled current isw obtained by sampling the output current of the drain electrode D of the switching transistor. The first comparator C1 is configured to output a first trigger signal in response to the first current signal I1 (or isw) and the third current signal iref. A first input terminal A3 of the second comparator C2 is electrically connected to the first inductor L, a second input terminal A4 of the second comparator C2 is electrically connected to the control module 400, and an 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 configured to receive a second current signal I2, i.e., the inductor current iL. The second input terminal A4 of the second comparator C2 is configured to receive a preset reference voltage signal Vref. The second comparator C2 is configured to output a second trigger signal in response to 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 T1. The trigger is configured to output a first control signal K1 in response to the first trigger signal and the second trigger signal, thereby controlling the conduction or cutoff of the switch T1.

[0076] 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) regulation is performed to obtain a first output value PI. Multiplying the first output value PI by the absolute value |Vin| of Vin yields a second output value, i.e., a third current signal iref. iref is used as the reference value for isw, and the comparison result obtained by comparing it with isw is the first trigger signal. The first comparator C1 transmits the first trigger signal to the first input of the trigger 520. The second comparator C2 receives signals iL and Vref at its two inputs, respectively. Comparing iL with Vref detects the inductor zero-crossing signal, and transmits the zero-crossing detection result, i.e., the second trigger signal, to the second input of the trigger 520. For example, when isw is greater than iref, the trigger 520, under the influence of the first trigger signal, outputs a low-level first control signal K1, thereby turning off the switch T1. In combination with the above description, the first inductor L is now in a discharging state. When the zero crossing of iL of the first inductor L is detected, trigger 520, under the influence of the second trigger signal, can output a high-level first control signal K1, thereby controlling switch T1 to conduct. Combined with the above, the first inductor L is now in a charging state. This allows the current flowing through the inductor to be controlled so that it is synchronized with the voltage modulation envelope signal, forming a sinusoidal wave with the same frequency and phase as the voltage. This reduces the system's reactive power, thereby improving the power factor to, for example, above 0.95, reducing harmonics in the current, minimizing interference with the power grid, and improving the system's energy efficiency.

[0077] In some embodiments, as 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 a second node P2, respectively. The first capacitor Cout and the load 530 are connected in parallel.

[0078] For example, Figure 5 As shown, Q1 can be considered the freewheeling diode of switch T1. When the first inductor L is in the discharge state, iL releases energy to Cout and load 530 through freewheeling diode Q1, and iL decreases linearly. Due to the unidirectional conduction characteristics of the diode, current is allowed to flow to Cout and load 530 only when the first inductor L is in the discharge state.

[0079] In some embodiments, as 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.

[0080] For example, Figure 5 As shown, Q2 is connected in parallel across 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 impact on Q1, thus protecting Q1.

[0081] In some embodiments, the motor control system may further include a frequency conversion module. The power module may include a voltage adjustment unit electrically connected to the PFC, the control module, and the frequency conversion module. The voltage adjustment unit is configured to generate a second power signal based on a first power signal transmitted from the PFC, and provide the second power signal to the control module and the frequency conversion module. The voltage adjustment unit includes a gallium nitride transistor.

[0082] For example, the voltage adjustment unit can receive a first power signal from the PFC. As previously mentioned, the first power signal is a high-voltage electrical signal, such as 380V. The voltage adjustment unit can adjust the voltage of the first power signal based on the operating parameters of the control module and the frequency conversion module, thereby generating and transmitting a 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 also transmit a second power signal with a voltage of, for example, 15V to the frequency conversion module. In conjunction with the foregoing, to reduce system power and meet temperature rise requirements, the switching transistors in the voltage adjustment module can also be gallium nitride transistors.

[0083] 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 This is a schematic flow chart of a motor control method for a range hood provided in an embodiment of the present application. For example, Figure 6 As shown, the control method may include:

[0084] 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;

[0085] Step S620: Control the inverter module to drive the motor under the action of the first power signal.

[0086] In some embodiments, when the motor control system of the range hood includes a first inductor, the method further includes: obtaining a second current signal of the first inductor;

[0087] Performing signal sampling on the input power supply to obtain a voltage sampling signal;

[0088] Based on the second current signal and the voltage sampling signal, the gallium nitride transistor in the power factor correction unit is controlled to be turned on or off.

[0089] In some embodiments, controlling the power factor correction unit to generate a first power signal based on an input power source includes:

[0090] controlling the power factor correction unit to generate a first voltage signal based on an input power supply;

[0091] Controlling the power factor correction unit to determine a voltage error value based on the first voltage signal and a preset reference voltage signal;

[0092] Controlling the power factor correction unit to perform proportional-integral regulation on the voltage error value to obtain a first output value;

[0093] controlling the power factor correction unit to multiply the first output value by the absolute value of the voltage sampling signal to obtain a second output value;

[0094] controlling the power factor correction unit to determine a first trigger signal based on a comparison result of the first current signal and the second output value;

[0095] 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.

[0096] Thus, after amplifying the input power voltage using a power factor correction unit, a DC signal with a higher voltage value can be generated. This DC signal is used to provide energy for the subsequent motor drive, allowing the motor vector control to be based on the bus voltage, such as 380V, rather than being limited to the rectified voltage value of 110V or 220V. This makes the motor control system applicable to power systems with a wider range of voltage values, improving the applicability and generalization of the motor control system. Furthermore, adding a power factor correction unit to the input stage of the motor control system can adjust the current waveform to synchronize it with the voltage waveform, reducing reactive power, thereby improving the power factor, reducing harmonic components in the current, reducing interference with the power grid, and improving the system's energy efficiency. Traditional home appliance manufacturers mostly use Si MOS transistors or IGBTs as semiconductor power switching devices. As the output load increases, the current flowing through the MOS and IGBT power devices increases, increasing the switching and conduction losses of the switching devices, resulting in increased power consumption and severe heat generation. This temperature rise is often addressed by adding a heat sink to the power device, which increases the cost of the electronic control and the size of the hardware. 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 additional heat sinks, which improves production efficiency and saves production costs.

[0097] According to a third aspect of the present application, an electronic device is also provided. Figure 7 This is 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.

[0098] According to a fourth aspect of the present application, a storage medium is further provided, on which program instructions are stored. When executed, the program instructions are used to execute the motor control method for a range hood as described above. The storage medium may include, for example, a tablet computer storage component, a computer hard disk, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the foregoing. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0099] 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.

[0100] A person skilled in the art can understand the motor control method, electronic equipment, 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, and will not be repeated here for the sake of brevity.

[0101] In the several embodiments provided in this 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 merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, 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.

[0102] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0103] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0104] 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, 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 and includes a number of instructions for enabling 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 code.

[0105] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. 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. 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. 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 signal; 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 GaN transistor, respectively. The second input terminal of the analog control subunit is electrically connected to the second electrode of the GaN transistor, and the third input terminal of the analog control subunit is electrically connected to the first inductor. The analog control subunit is configured to control the conduction or cutoff of the GaN transistor. The first electrode is one of the source and the drain of the GaN transistor, and the second electrode is the other of the source and the drain of the GaN transistor. 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.

2. The motor control system of the range hood according to claim 1, characterized in that: Also includes: Sampling module and 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.

3. The motor control system of the range hood according to claim 2, 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 a user input operation, 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 influence 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 influence 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.

4. The motor control system of the range hood according to claim 1, 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 via a second node, and the first capacitor and the load are connected in parallel.

5. The motor control system of the range hood according to claim 4, 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.

6. The motor control system of the range hood according to claim 2, 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.

7. The motor control system of the range hood according to claim 1, characterized in that: Also includes: An AC 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 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.

8. A range hood motor control method, characterized in that: The motor control system applied to the range hood according to any one of claims 1 to 7, 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.

9. The motor control method for a range hood according to claim 8, characterized in that: In the case where the motor control system of the range hood includes a first inductor, the method further includes: obtaining a second current signal of the first inductor; Performing signal sampling on the input power supply to obtain a voltage sampling signal; Based on the second current signal and the voltage sampling signal, the gallium nitride transistor in the power factor correction unit is controlled to be turned on or off.

10. The motor control method of a range hood according to claim 9, 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 voltage sampling 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.

11. An electronic device, characterized in that: The system 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 according to any one of claims 8 to 10 when the processor is running. 12 . A storage medium having program instructions stored thereon, wherein the program instructions are used to execute the motor control method for a range hood according to claim 8 , when the program instructions are run.

13. A range hood, characterized in that: include: The electronic device according to claim 11; and / or The motor control system of a range hood according to any one of claims 1 to 7.

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