Motor control system and method, electronic equipment, storage medium and range hood

Abstract

The invention provides a motor control system and method, electronic equipment, a storage medium and a range hood. Relates to the technical field of household appliances. The motor control system comprises a power supply module, a signal data processing module, a driving module and an inversion module. The driving module comprises a half-bridge driving circuit and a half-bridge voltage division circuit, one end of the half-bridge driving circuit is electrically connected with the signal data processing module, and the other end of the half-bridge driving circuit is electrically connected with the half-bridge voltage division circuit; the inverter module is electrically connected with the motor, the inverter module comprises half-bridge inverter circuits, the half-bridge inverter circuits and the half-bridge voltage division circuits are connected in series in a one-to-one mode, and the inverter module is used for driving the motor under the action of the driving module. The condition that the half-bridge inverter circuit is mistakenly conducted due to the fact that crosstalk voltage is too high is prevented, the risk that all bridges in the half-bridge inverter circuit are communicated is effectively reduced, the reliability of a motor control system is improved, and the motor driving effect is guaranteed.

Description

Technical Field

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

[0002] At present, the control method for the high-voltage motor inverter drive system is generally to rectify and filter the input mains power, and then use power devices such as metal-oxide-semiconductor field-effect transistors (MOSFET) or insulated-gate bipolar transistors (IGBT) to drive the motor. For the motor drive system that uses Si (silicon) MOS tubes or IGBT tubes as power devices to drive the motor, it has the characteristics of large on-resistance, slow switching speed and long reverse recovery time. During the high-power continuous operation of the motor, the half-bridge inverter switch tube has serious heat loss. In addition, in order to prevent the upper and lower tubes in the half-bridge circuit from being turned on at the same time, a dead time is usually introduced. During the dead time, the MOS tube or IGBT tube is in a reverse freewheeling conduction state, thereby generating dead time losses. The reverse recovery time of the MOS tube or IGBT tube is long, so a longer dead time needs to be set. The longer the dead time, the greater the dead time loss, which affects the motor drive efficiency.

[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, comprising: Power module, signal data processing module, drive module and inverter module; The power module is electrically connected to the signal data processing module, the drive module and the inverter module respectively, and the power module is used to provide corresponding power signals to the signal data processing module, the drive module and the inverter module; The driving module includes a half-bridge driving circuit and a half-bridge voltage dividing circuit, one end of the half-bridge driving circuit is electrically connected to the signal data processing module, and the other end of the half-bridge driving circuit is electrically connected to the half-bridge voltage dividing circuit; The inverter module is electrically connected to the motor, and the inverter module includes a half-bridge inverter circuit. The half-bridge inverter circuit and the half-bridge voltage divider circuit are connected in series one-to-one. The inverter module is used to drive the motor under the action of the drive module, wherein the half-bridge inverter circuit includes a gallium nitride transistor.

[0006] In some embodiments, the half-bridge driving circuit includes a plurality of upper bridge driving circuits and a plurality of lower bridge driving circuits, the half-bridge voltage divider circuit includes a plurality of upper bridge voltage divider circuits and a plurality of lower bridge voltage divider circuits, the upper bridge driving circuit and the lower bridge driving circuit are both electrically connected to the signal data processing module, the upper bridge driving circuit is connected in series with the upper bridge voltage divider circuit in a one-to-one manner, and the lower bridge driving circuit is connected in series with the lower bridge voltage divider circuit in a one-to-one manner; The half-bridge inverter circuit includes a plurality of upper bridge inverter circuits and a plurality of lower bridge inverter circuits. The upper bridge inverter circuits are connected in series one-to-one with the upper bridge voltage divider circuits, and the lower bridge inverter circuits are connected in series one-to-one with the lower bridge voltage divider circuits.

[0007] In some embodiments, the signal data processing module is used to provide a first control signal to the upper bridge drive circuit, the signal data processing module is used to provide a second control signal to the lower bridge drive circuit, the upper bridge voltage divider circuit is used to provide a first drive signal to the upper bridge inverter circuit under the action of the first control signal, and the lower bridge voltage divider circuit is used to provide a second drive signal to the lower bridge inverter circuit under the action of the second control signal, wherein, when one of the first control signal and the second control signal is a valid level signal, the other of the first control signal and the second control signal is an invalid level signal; when one of the first control signal and the second control signal is an invalid level signal, the other of the first control signal and the second control signal includes a valid level signal and an invalid level signal.

[0008] In some embodiments, the half-bridge voltage divider circuit includes: a first resistor, a second resistor, a third resistor, a first diode, an acceleration subcircuit and a voltage stabilization subcircuit, wherein one end of the first resistor is electrically connected to the signal data processing module, the other end of the first resistor is electrically connected to one end of the acceleration subcircuit through a first node, the cathode of the first diode is electrically connected to the signal data processing module, the anode of the first diode is electrically connected to one end of the third resistor, the other end of the third resistor is electrically connected to the first node, the other end of the acceleration subcircuit is electrically connected to one end of the voltage stabilization subcircuit and the gate of the gallium nitride transistor in the half-bridge inverter circuit through the second node, the second resistor is electrically connected between the first node and the second node, the other end of the voltage stabilization subcircuit is electrically connected to the second electrode of the gallium nitride transistor in the half-bridge inverter circuit, the first electrode of the gallium nitride transistor in the half-bridge inverter circuit is electrically connected to the power module, 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.

[0009] In some embodiments, the voltage stabilizing subcircuit includes: a first voltage stabilizing transistor, a second diode and a third diode, wherein the cathode of the first voltage stabilizing transistor is electrically connected to the second node, the anode of the first voltage stabilizing transistor is electrically connected to the third node, the cathode of the second diode and the anode of the third diode are both electrically connected to the third node, and the anode of the second diode and the cathode of the third diode are both electrically connected to the second electrode of the gallium nitride transistor in the half-bridge inverter circuit.

[0010] In some embodiments, the inverter module includes a plurality of protection circuits, one end of a protection circuit is electrically connected to a group of internal coils of the motor, and the other end of the protection circuit is grounded.

[0011] In some embodiments, the protection circuit includes a fourth resistor and a first capacitor connected in series.

[0012] In some embodiments, it also includes: a sampling feedback module, the sampling feedback module includes multiple groups of current sampling circuits and multiple groups of voltage sampling circuits, one end of a group of voltage sampling circuits is electrically connected to a group of internal coils of the motor, and the other end of the voltage sampling circuit is grounded; one end of the current sampling circuit is electrically connected one-to-one with the half-bridge inverter circuit, and the other end of the current sampling circuit is grounded.

[0013] In some implementations, the number of groups of the half-bridge inverter circuits is equal to the number of groups of the internal coils of the motor.

[0014] In some embodiments, the number of gallium nitride transistors included in the upper bridge inverter circuit and the number of gallium nitride transistors included in the lower bridge inverter circuit are equal, and the number of gallium nitride transistors included in the upper bridge inverter circuit and the number of gallium nitride transistors included in the lower bridge inverter circuit are positively correlated with the power of the motor.

[0015] In a second aspect, a motor control method is also proposed, which is applied to the motor control system as described above, and the control method includes: The control signal data processing module provides a control signal to the half-bridge driving circuit, so that the half-bridge voltage divider circuit provides a driving signal to the inverter module under the action of the control signal; Under the action of the driving signal, the inverter module is controlled to drive the motor.

[0016] In some implementations, when the motor control system includes a sampling circuit, controlling the inverter module to drive the motor includes: The current sampling circuit is used to sample the current of the inverter module to obtain a current sampling signal; The voltage sampling circuit is used to sample the voltage of the internal coil of the motor to obtain a voltage sampling signal; Edge detection is performed on the current sampling signal and the voltage sampling signal to adjust the control signal based on the edge detection result.

[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 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 as described above when running.

[0019] In a fifth aspect, a range hood is also provided, comprising: An electronic device as described above; and / or a motor control system as described above.

[0020] After replacing the silicon transistors in the original power devices with gallium nitride transistors, the temperature rise of the power devices is reduced and the system efficiency is improved. Due to the material properties of gallium nitride, the gate voltage resistance of gallium nitride transistors is low and the conduction threshold is small and low, which is prone to mis-conduction. Therefore, before the electrical signal is given to the gate of the gallium nitride transistor, the control signal is divided by a half-bridge voltage divider circuit to prevent the half-bridge inverter circuit from being mis-conducted due to excessive crosstalk voltage, effectively reducing the risk of intercommunication between the bridges in the half-bridge inverter circuit, solving the problem that the existing technology is difficult to replace silicon transistors with gallium nitride transistors in motor drive, improving the reliability of the motor control system, and ensuring the motor drive effect.

[0021] The motor control system of the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be 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 1A schematic circuit diagram of a motor drive system provided in an embodiment of the present application; Figure 2 A schematic block diagram of a motor control system provided in an embodiment of the present application; Figure 3 A schematic block diagram of another motor control system provided in an embodiment of the present application; Figure 4 A timing diagram of a half-bridge drive circuit provided in an embodiment of the present application; Figure 5 A schematic circuit diagram of some modules of a motor control system provided in an embodiment of the present application; Figure 6 A schematic flow chart of a motor control method provided in an embodiment of the present application; Figure 7 A 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] 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, thereby reducing the dead time loss of power tubes. However, compared with Si transistors, GaN transistors have low gate withstand voltage and low conduction threshold, which are easily interfered by the switch on the other side of the bridge arm and cause false turn-on. Figure 1 The following is a schematic circuit diagram of a motor drive system provided in an embodiment of the present application. Figure 1 As shown, 100 is a V-phase half-bridge driving circuit, which includes an upper bridge arm 110 located at the upper side and a lower bridge arm 120 located at the lower side. Figure 1 When the motor drive system shown is used to drive a three-phase motor, the motor drive system may also include Figure 1 The U-phase half-bridge driving circuit and the W-phase half-bridge driving circuit shown in FIG. The circuit structures of the U-phase half-bridge driving circuit and the W-phase half-bridge driving circuit can be the same as the circuit structure of the V-phase half-bridge driving circuit 100. Figure 1 For simplicity, it will not be shown again. During the dead time when the upper bridge arm 110 and the lower bridge arm 120 of the V-phase half-bridge drive circuit 100 are both closed, the gate-source voltage difference of the transistor in the upper bridge arm 110 and the gate-source voltage difference of the transistor in the lower bridge arm 120 are both at a low level. When the upper bridge arm 110 is turned on by the drive signal control, the bus voltage Vbus passes through the source and drain of the transistor in the upper bridge arm 110, and generates a common-mode signal at the moving point V. The common-mode signal generated by the moving point V can flow back from the three paths of the capacitor Cds in the lower bridge arm 120, the capacitor Cgd to the resistor Rgl, and the capacitor Cgd to the capacitor Cgs to generate a common-mode interference voltage, that is, Figure 1 The interference glitch shown. This interference glitch will act on the gate of the transistor of the lower bridge arm 120. When the common-mode interference voltage exceeds the threshold voltage Vth, the transistor of the lower bridge arm 120 will be mis-conducted. At this time, the upper and lower bridges are turned on at the same time, which is equivalent to the bus voltage being short-circuited to the ground, thereby generating a large short-circuit current. Since GaN transistors have the above-mentioned turn-on voltage characteristics, GaN transistors are sensitive to peripheral circuits and routing parasitic parameters, so they are rarely used in the direction of high-voltage motor inverter drive.

[0029] In order to solve the above technical problem, according to the first aspect of the present application, a motor control system is proposed. Figure 2 A schematic block diagram of a motor control system provided in an embodiment of the present application. For example, Figure 2As shown, the motor control system may include: a power supply module 210, a signal data processing module 220, a drive module 230 and an inverter module 240. Figure 2 As shown, the power module 210 is electrically connected to the signal data processing module 220, the drive module 230 and the inverter module 240 respectively, and the power module 210 is used to provide corresponding power signals to the signal data processing module 220, the drive module 230 and the inverter module 240. Exemplarily, the power module can provide a DC signal with a voltage of 5V for the signal data processing module, the power module can provide a DC signal with a voltage of 15V for the drive module, and the power module can provide a DC signal with a voltage of 310V for the inverter module. Among them, the voltage value of the electric signal provided by the power module can be reasonably set and adjusted according to the parameters of each module, and the above values ​​are only exemplary and do not mean the limitation of the voltage value of the electric signal actually output by the power module.

[0030] For example, Figure 2 As shown, the driving module 230 may include a half-bridge driving circuit 231 and a half-bridge voltage divider circuit 232. One end of the half-bridge driving circuit 231 is electrically connected to the signal data processing module 220, and the other end of the half-bridge driving circuit 231 is electrically connected to the half-bridge voltage divider circuit 232. The inverter module 240 is electrically connected to the motor 300, and the inverter module 240 includes a half-bridge inverter circuit 241, and the half-bridge inverter circuit 241 is connected in series with the half-bridge voltage divider 232 circuit one-to-one. The inverter module 240 is used to drive the motor 300 under the action of the driving module 230. Among them, the half-bridge inverter circuit 241 includes a gallium nitride transistor.

[0031] For example, Figure 2 As shown, the half-bridge driving circuit 231 can receive the control signal from the signal data processing module 220, thereby amplifying and enhancing the control signal, stabilizing the control signal within the specification range of the gate-source voltage difference Vgs of the gallium nitride transistor, improving the signal driving capability, and then controlling the conduction or cutoff of the gallium nitride transistor in the half-bridge inverter circuit 241. Among them, the control signal can be a high-level signal or a low-level signal, and the control signal is used to control the driving condition of the bridge arm in the half-bridge driving circuit 231. Correspondingly, the driving condition of the bridge arm in the half-bridge driving circuit 231 can determine the conduction condition of the bridge arm in the half-bridge inverter circuit 241. Exemplarily, when the half-bridge driving circuit 231 is in the on state, the control signal can be divided by the half-bridge voltage divider circuit 232, and then the electric signal after the voltage division process is used to drive the gallium nitride transistor in the half-bridge inverter circuit 241. Among them, the gallium nitride transistor in the half-bridge inverter circuit 241 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, thereby driving the motor.

[0032] After replacing the silicon transistors in the original power devices with gallium nitride transistors, the temperature rise of the power devices is reduced and the system efficiency is improved. Due to the material properties of gallium nitride, the gate voltage resistance of gallium nitride transistors is low and the conduction threshold is small and low, which is prone to mis-conduction. Therefore, before the electrical signal is given to the gate of the gallium nitride transistor, the control signal is divided by a half-bridge voltage divider circuit to prevent the half-bridge inverter circuit from being mis-conducted due to excessive crosstalk voltage, effectively reducing the risk of intercommunication between the bridges in the half-bridge inverter circuit, solving the problem that the existing technology is difficult to replace silicon transistors with gallium nitride transistors in motor drive, improving the reliability of the motor control system, and ensuring the motor drive effect.

[0033] Figure 3 A schematic block diagram of another motor control system provided in an embodiment of the present application. For example, Figure 3 As shown, in some embodiments, the half-bridge drive circuit 231 may include multiple upper bridge drive circuits 231a and multiple lower bridge drive circuits 231b. The half-bridge voltage divider circuit 232 may include multiple upper bridge voltage divider circuits 232a and multiple lower bridge voltage divider circuits 232b. The half-bridge inverter circuit 241 may include multiple upper bridge inverter circuits 241a and multiple lower bridge inverter circuits 241b. The upper bridge drive circuit 231a and the lower bridge drive circuit 231b are both electrically connected to the signal data processing module 220. The signal data processing module 220 is used to provide a first control signal K1 to the upper bridge drive circuit 231a, and the signal data processing module 220 is used to provide a second control signal K2 to the lower bridge drive circuit 231b. Figure 4 A timing diagram of a half-bridge drive circuit provided in an embodiment of the present application. For example, Figure 4 As shown, when the first control signal K1 is a valid level signal, the second control signal K2 is an invalid level signal; when the first control signal K1 is an invalid level signal, the second control signal K2 includes a valid level signal and an invalid level signal. It should be noted that the distinction between valid level signals and invalid level signals is for gallium nitride transistors. If the signal can drive the gallium nitride transistor to turn on, the signal is a valid level signal. Conversely, if the signal can drive the gallium nitride transistor to turn off, the signal is an invalid level signal. Figure 4 In the illustrated embodiment, a high level signal may be regarded as a valid level signal, and a low level signal may be regarded as an invalid level signal. Figure 3As shown, the upper bridge driving circuit 231a is connected in series with the upper bridge voltage divider circuit 232a one-to-one, the upper bridge inverter circuit 241a is connected in series with the upper bridge voltage divider circuit 232a one-to-one, and the upper bridge voltage divider circuit 232a is used to provide the first driving signal Q1 to the upper bridge inverter circuit 241a under the action of the first control signal K1. The lower bridge driving circuit 231b is connected in series with the lower bridge voltage divider circuit 232b one-to-one, the lower bridge inverter circuit 241b is connected in series with the lower bridge voltage divider circuit 232b one-to-one, and the lower bridge voltage divider circuit 232b is used to provide the second driving signal Q2 to the lower bridge inverter circuit 241b under the action of the second control signal K2. Figure 3 and Figure 4 , when the signal data processing module 220 provides the first control signal K1 to the upper bridge drive circuit 231a and provides the second control signal K2 to the lower bridge drive circuit 231b, in the first stage, the first control signal K1 is a valid level signal, and the second control signal K2 is an invalid level signal. At this time, the upper bridge drive circuit 231a is in the on state, and the lower bridge drive circuit 231b is in the off state. When the upper bridge drive circuit 231a is in the on state, the upper bridge voltage divider circuit 232a can perform voltage division processing on the first control signal K1, thereby transmitting the first drive signal Q1 to the upper bridge inverter circuit 241a. It should be noted that since the half-bridge voltage divider circuit only performs voltage division processing on the control signal, the timing of the drive signal obtained thereby can be the same as the timing of the control signal. That is, the timing of the first drive signal can be the same as the timing of the control signal. Figure 4 The timing of the first control signal K1 is the same as that of the second drive signal. Figure 4The timing of the second control signal K2 shown is the same. Therefore, in the first stage, the first drive signal Q1 is a valid level signal, and the second drive signal Q2 is an invalid level signal. At this time, under the action of the first drive signal Q1 and the second drive signal Q2, the upper bridge inverter circuit 241a is in a conducting state, and the lower bridge inverter circuit 241b is in a cut-off state. The upper bridge inverter circuit 241a is used to drive the motor 300. In the second stage, the first control signal K1 is converted to an invalid level signal, and the second control signal K2 is still an invalid level signal. At this time, the upper bridge drive circuit 231a is in a cut-off state, and the lower bridge drive circuit 231b is also still in a cut-off state. Combined with the foregoing, it can be seen that the first drive signal Q1 is also converted to an invalid level signal, and the second drive signal Q2 is still an invalid level signal, so the upper bridge inverter circuit 241a and the lower bridge inverter circuit 241b are both in a cut-off state. It should be noted that the motor 300 is mostly an inductive load, and the current flowing through the motor winding cannot change suddenly at the moment of power-off. Furthermore, one of the upper bridge inverter circuit 241a and the lower bridge inverter circuit 241b is electrically connected to the bus voltage, the other of the upper bridge inverter circuit 241a and the lower bridge inverter circuit 241b is grounded, and both the upper bridge inverter circuit 241a and the lower bridge inverter circuit 241b include gallium nitride transistors, wherein the gallium nitride transistors include freewheeling diodes. Therefore, at the moment when both the upper bridge inverter circuit 241a and the lower bridge inverter circuit 241b are in the cut-off state and the freewheeling diodes of the gallium nitride transistors in the grounded inverter circuits of the two are in the freewheeling state, that is, at the moment when the first stage is switched to the second stage, the motor phase voltage, for example Figure 4The Vu of the superimposed winding coil induced electromotive force can generate a falling edge to pull the phase voltage down to a negative voltage. In the third stage, the first control signal K1 is an invalid level signal, and the second control signal K2 is converted to a valid level signal. At this time, the upper bridge drive circuit 231a is in a cut-off state, and the lower bridge drive circuit 231b is in a conducting state. Correspondingly, the first drive signal Q1 is an invalid level signal, and the second drive signal Q2 is a valid level signal. At this time, under the action of the first drive signal Q1 and the second drive signal Q2, the upper bridge inverter circuit 241a is in a cut-off state, and the lower bridge inverter circuit 241b is in a conducting state. The lower bridge inverter circuit 241b is used to drive the motor 300. In the fourth stage, the first control signal K1 is still an invalid level signal, and the second control signal K2 is converted to an invalid level signal. At this time, the upper bridge drive circuit 231a is still in a cut-off state, and the lower bridge drive circuit 231b is also in a cut-off state. Combined with the above, it can be seen that the first drive signal Q1 is still an invalid level signal, and the second drive signal Q2 is also converted to an invalid level signal, so the upper bridge inverter circuit 241a and the lower bridge inverter circuit 241b are both in the cut-off state. At the moment of switching from stage ③ to stage ④, because the current flowing through the motor winding cannot change suddenly, the grounded gallium nitride transistor is in the reverse freewheeling state again, and the motor phase voltage Vu superimposed on the winding coil induced electromotive force can generate a falling edge to pull the phase voltage Vu down to a negative voltage again. Therefore, for the half-bridge drive circuit on the non-conducting side, even if crosstalk occurs, the upper limit of its crosstalk glitch voltage is still less than the threshold voltage of the gallium nitride transistor in the half-bridge drive circuit on the non-conducting side, so the half-bridge drive circuit on the non-conducting side will not be affected by the crosstalk glitch voltage and mis-conduct. Stage ⑤ is stage ① of the next cycle, which has been described above and will not be repeated.

[0034] In some embodiments, the motor control system may include a sampling feedback module. The sampling feedback module includes multiple groups of current sampling circuits and multiple groups of voltage sampling circuits. Exemplarily, when there are three groups of internal coils of the motor, the sampling feedback module may include three groups of current sampling circuits and three groups of voltage sampling circuits. One end of the first group of voltage sampling circuits may be electrically connected to the U-phase coil of the motor, and the other end may be grounded. One end of the second group of voltage sampling circuits may be electrically connected to the V-phase coil of the motor, and the other end may be grounded. One end of the third group of voltage sampling circuits may be electrically connected to the W-phase coil of the motor, and the other end may be grounded. One end of the first group of current sampling circuits may be electrically connected to the first group of half-bridge inverter circuits one-to-one, and the other end may be grounded. One end of the second group of current sampling circuits may be electrically connected to the second group of half-bridge inverter circuits one-to-one, and the other end may be grounded. One end of the third group of current sampling circuits may be electrically connected to the third group of half-bridge inverter circuits one-to-one, and the other end may be grounded. Wherein, both the voltage sampling circuit and the current sampling circuit include sampling resistors.

[0035] Exemplarily, taking the U-phase current flowing into the motor as an example, the U-phase upper bridge inverter circuit is in the on state, and the lower bridge inverter circuit is in the off state. At this time, the upper bridge inverter circuit switches from the on state to the off state, and the gallium nitride transistor of the lower bridge inverter circuit is in the freewheeling state. At the moment, the moving point voltage Vu is superimposed on the winding coil induced electromotive force, and the falling edge is pulled down to, for example, about -3V, and the current flowing through the U-phase sampling resistor increases in the reverse direction. When the lower bridge inverter circuit is in the on state and the upper bridge inverter circuit is in the off state, the lower bridge inverter circuit is switched from the on state to the off state, and the gallium nitride transistor of the lower bridge inverter circuit is in the reverse freewheeling state again. The moving point voltage Vu is superimposed on the winding induced electromotive force, and the falling edge is pulled down to, for example, about -3V. Therefore, during the operation of the motor, the sampling circuit can capture and identify the moving point voltage and the sampling current change edge signal to determine whether the gallium nitride transistors in the upper and lower bridge inverter circuits have completed the switch switching. Taking the U phase as an example, the signal edge detection can be performed on the U phase moving point voltage Uv and current Iru. When the effective level signal is identified to have changed, the control signal can be flipped, thereby further shortening the dead zone time and reducing the dead zone loss while ensuring that the upper and lower bridges are prevented from being directly connected.

[0036] Figure 5 Schematic circuit diagram of some modules of a motor control system provided in an embodiment of the present application. As mentioned above, in some embodiments, the half-bridge voltage divider circuit includes an upper bridge voltage divider circuit 232a and a lower bridge voltage divider circuit 232b. For example, Figure 5As shown, taking the upper bridge voltage divider circuit 232a as an example, the upper bridge voltage divider circuit 232a may include a first resistor Rk1, a second resistor Rtf1, a third resistor Rg1, a first diode, an acceleration subcircuit and a voltage stabilization subcircuit, wherein one end of the first resistor Rk1 is electrically connected to the signal data processing module 220, the other end of the first resistor Rk1 is electrically connected to one end of the acceleration subcircuit 510 through the first node P1, the cathode of the first diode D1 is electrically connected to the signal data processing module 220, and the anode of the first diode D1 is electrically connected to the cathode of the third resistor Rg1. One end of the voltage stabilizing subcircuit 520 is electrically connected, the other end of the third resistor Rg1 is electrically connected to the first node P1, the other end of the acceleration subcircuit 510 is electrically connected to one end of the voltage stabilizing subcircuit 520 and the gate G of the gallium nitride transistor QH in the half-bridge inverter circuit through the second node P2, the second resistor Rtf1 is electrically connected between the first node P1 and the second node P2, the other end of the voltage stabilizing subcircuit 520 is electrically connected to the second electrode D of the gallium nitride transistor QH in the half-bridge inverter circuit, and the first electrode S of the gallium nitride transistor QH in the half-bridge inverter circuit is electrically connected to the power module. The first electrode is one of the source and drain of the gallium nitride transistor, and the second electrode is the other of the source and drain of the gallium nitride transistor. In this embodiment, the power module can be the bus voltage Vbus, the first electrode can be the source of the gallium nitride transistor, and the second electrode can be the drain of the gallium nitride transistor.

[0037] For example, the following description is made by taking the control of the upper bridge drive circuit as an example. Figure 5 , the signal data processing module 220 outputs a high-level first control signal, and the high-level signal is divided by the first resistor Rk1, the second resistor Rtf1 and the third resistor Rg1, and the divided voltage is applied to the gate G of the gallium nitride transistor QH to charge the junction capacitance Cgs. In order to prevent the gate G from being damaged by overvoltage, a voltage stabilization subcircuit 520 is connected in parallel between the gate G and the drain of the gallium nitride transistor QH. The gallium nitride transistor QH can quickly charge the junction capacitances Cgd and Cgs at the moment of turning on and off, and the second resistor Rtf1 connected in series in the circuit can limit the charging and discharging current. Therefore, an acceleration subcircuit 510 is connected in parallel across the second resistor Rtf1 to achieve the purpose of rapid opening and closing. Among them, the acceleration subcircuit 510 may include the following: Figure 5The second capacitor Cc1 shown. In addition, at the moment when the first control signal changes from a high-level signal to a low-level signal, the voltage on the left side of the acceleration subcircuit 510 is pulled down to ground, and the charge stored in the second capacitor Cc1 can form a negative voltage at the gate of the gallium nitride transistor, which can be clamped by the voltage stabilization subcircuit 520 at, for example, about 0.7V. That is, when the upper bridge drive circuit is turned off, the junction capacitances Cgd and Cgs of the gallium nitride transistor QH can be quickly discharged through the first resistor Rk1, the acceleration subcircuit 510, the third resistor Rg1 and the first diode D1. Since the second capacitor Cc1 in the acceleration subcircuit 510 can store charge in the conductive device, a negative voltage can be formed at the gate G of the gallium nitride transistor QH at the moment when the upper bridge drive circuit is turned off, preventing the gallium nitride transistor QH in the upper bridge drive circuit from being turned on by mistake due to excessive crosstalk voltage, effectively reducing the upper bridge drive circuit and the lower bridge drive circuit from being turned on at the same time, and avoiding the upper and lower bridges from being directly connected, thereby forming a short-circuit large current.

[0038] For example, the following description is still made by taking the upper bridge drive circuit being turned on as an example. Figure 5 As shown, in the upper bridge voltage divider circuit 232a, the voltage stabilizing subcircuit 520 may include a first voltage stabilizing transistor Zd1, a second diode D2 and a third diode D3, wherein the cathode of the first voltage stabilizing transistor Zd1 is electrically connected to the second node P2, the anode of the first voltage stabilizing transistor Zd1 is electrically connected to the third node P3, the cathode of the second diode D2 and the anode of the third diode D3 are both electrically connected to the third node P3, and the anode of the second diode D2 and the cathode of the third diode D3 are both electrically connected to the second electrode D of the gallium nitride transistor QH in the half-bridge inverter circuit. Exemplarily, when the upper bridge drive circuit is turned off, the left side of the second capacitor Cc1 is pulled to a low level, and the right side of the second capacitor Cc1, that is, the gate G of the gallium nitride transistor QH can be clamped to a negative voltage such as -1.4V by the first voltage stabilizing transistor Zd1. As the charge of the second capacitor Cc1 is released, the negative voltage can gradually return to 0V. The second diode D2 and the third diode D3 can further increase the negative voltage when turned off, thereby increasing the safety margin.

[0039] It should be noted that Figure 5 Only the case where the drive module and the inverter module drive one phase V of the motor is shown. If the motor includes two phases or more than two phases, the drive module and the inverter module can be set accordingly with reference to the above-mentioned embodiment. In some embodiments, the number of groups of half-bridge inverter circuits is equal to the number of groups of internal coils of the motor. Among them, the number of groups of internal coils of the motor is the number of phases of the motor. For example, when the motor is a three-phase motor, the corresponding number of groups of half-bridge inverter circuits is 3, that is, 3 upper bridge inverter circuits and 3 lower bridge inverter circuits are set.

[0040] In some embodiments, the number of gallium nitride transistors included in the upper bridge inverter circuit and the lower bridge inverter circuit is equal. Exemplarily, when the number of upper bridge inverter circuits and lower bridge inverter circuits is equal, for example, 3, each upper bridge inverter circuit may include a gallium nitride transistor, and each lower bridge inverter circuit may also include a gallium nitride transistor. If the motor driven by the upper bridge inverter circuit and the lower bridge inverter circuit is a high-power motor, in order to achieve effective driving of the motor, a certain number of gallium nitride transistors can be added to each upper bridge inverter circuit, and correspondingly, a corresponding number of gallium nitride transistors can be added to each lower bridge inverter circuit. Among them, all gallium nitride transistors in each upper bridge inverter circuit are connected in parallel, and all gallium nitride transistors in each lower bridge inverter circuit are connected in parallel. It should be noted that the number of gallium nitride transistors added in parallel is positively correlated with the motor power. When the motor power is greater, the number of gallium nitride transistors in parallel in each upper bridge inverter circuit and each lower bridge inverter circuit is greater.

[0041] In some embodiments, the inverter module may include multiple groups of protection circuits, one end of one group of protection circuits is electrically connected to a group of internal coils of the motor, and the other end of the protection circuit is grounded. Exemplarily, when there are three groups of internal coils of the motor, the inverter module may include three groups of protection circuits. One end of the first group of protection circuits can be electrically connected to the U-phase coil of the motor, and the other end is grounded. One end of the second group of protection circuits can be electrically connected to the V-phase coil of the motor, and the other end is grounded. One end of the third group of protection circuits can be electrically connected to the W-phase coil of the motor, and the other end is grounded. Since the switching speed of the gallium nitride transistors in the inverter module is relatively fast, large interference dv / dt and di / dt can be generated at the moving points V, U and W at the switching moment of the gallium nitride transistors. On the one hand, the interference signal can be absorbed by the junction capacitance of the above-mentioned gallium nitride transistors, and on the other hand, it can also be absorbed and filtered by the protection circuit, thereby reducing the conduction and radiation interference of the inverter module and ensuring the motor driving effect.

[0042] In some embodiments, a set of protection circuits may include a fourth resistor and a first capacitor connected in series. Common mode interference may be absorbed and filtered through a low impedance loop of a protection circuit including the first capacitor. In addition, in order to prevent excessive impact current flowing through the first capacitor, a fourth resistor may be connected in series with the first capacitor to limit the absorption current. It should be noted that the specific values ​​of the first capacitor and the fourth resistor may be determined by debugging according to the conduction and interference test conditions.

[0043] In some implementations, in order to reduce the common-mode and differential-mode interference generated by the GaN transistor switch, the path for current return in the inverter module is separated, the drive module is placed close to the GaN transistor, and the signal line loop of the drive module is shortened as much as possible to reduce the interference source radiating outward and coupling to the drive signal loop. When designing the circuit board, the source and drain pads of the GaN transistor can be coppered over a large area or tinned with a window to assist in heat dissipation of the GaN transistor.

[0044] In a second aspect of the present application, a motor control method is also proposed, which is applied to the motor control system as described above. Figure 6 A schematic flow chart of a motor control method provided in an embodiment of the present application is exemplarily shown as follows: Figure 6 As shown, the method may include: Step S610, the control signal data processing module provides a control signal to the half-bridge driving circuit, so that the half-bridge voltage divider circuit provides a driving signal to the inverter module under the action of the control signal; Step S620: Under the action of the driving signal, the inverter module is controlled to drive the motor.

[0045] In some embodiments, when the motor control system includes a sampling circuit, controlling the inverter module to drive the motor may include: The current sampling circuit is used to sample the current of the inverter module to obtain a current sampling signal; The voltage sampling circuit is used to sample the voltage of the internal coil of the motor to obtain a voltage sampling signal; Edge detection is performed on the current sampling signal and the voltage sampling signal to adjust the control signal based on the edge detection result.

[0046] According to a third aspect of the present application, an electronic device is 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 as described above when the processor is running. 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 described above when the computer program instructions are executed.

[0047] In 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 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.

[0048] In a fifth aspect of the present application, a range hood is provided, comprising: An electronic device as described above; and / or a motor control system as described above.

[0049] A person of ordinary skill in the art may understand the specific details and beneficial effects of the motor control method, electronic device, storage medium and range hood by reading the above description of the motor control system, which will not be elaborated here for the sake of brevity.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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, characterized in that: include: Power module, signal data processing module, drive module and inverter module; The power supply module is electrically connected to the signal data processing module, the driving module and the inverter module respectively, and the power supply module is used to provide corresponding power supply signals to the signal data processing module, the driving module and the inverter module; The driving module comprises a half-bridge driving circuit and a half-bridge voltage-dividing circuit, one end of the half-bridge driving circuit is electrically connected to the signal data processing module, and the other end of the half-bridge driving circuit is electrically connected to the half-bridge voltage-dividing circuit; The inverter module is electrically connected to the motor, and includes a half-bridge inverter circuit. The half-bridge inverter circuit is connected in series with the half-bridge voltage divider circuit in a one-to-one manner. The inverter module is used to drive the motor under the action of the driving module, wherein the half-bridge inverter circuit includes a gallium nitride transistor.

2. The motor control system according to claim 1, characterized in that: The half-bridge driving circuit includes a plurality of upper bridge driving circuits and a plurality of lower bridge driving circuits, the half-bridge voltage divider circuit includes a plurality of upper bridge voltage divider circuits and a plurality of lower bridge voltage divider circuits, the upper bridge driving circuit and the lower bridge driving circuit are both electrically connected to the signal data processing module, the upper bridge driving circuit is connected in series with the upper bridge voltage divider circuit in a one-to-one manner, and the lower bridge driving circuit is connected in series with the lower bridge voltage divider circuit in a one-to-one manner; The half-bridge inverter circuit comprises a plurality of upper bridge inverter circuits and a plurality of lower bridge inverter circuits. The upper bridge inverter circuits are connected in series one-to-one with the upper bridge voltage divider circuits, and the lower bridge inverter circuits are connected in series one-to-one with the lower bridge voltage divider circuits.

3. The motor control system according to claim 2, characterized in that: The signal data processing module is used to provide a first control signal to the upper bridge drive circuit, and the signal data processing module is used to provide a second control signal to the lower bridge drive circuit. The upper bridge voltage divider circuit is used to provide a first drive signal to the upper bridge inverter circuit under the action of the first control signal, and the lower bridge voltage divider circuit is used to provide a second drive signal to the lower bridge inverter circuit under the action of the second control signal, wherein, when one of the first control signal and the second control signal is a valid level signal, the other of the first control signal and the second control signal is an invalid level signal; when one of the first control signal and the second control signal is an invalid level signal, the other of the first control signal and the second control signal includes a valid level signal and an invalid level signal.

4. The motor control system according to claim 1, characterized in that: The half-bridge voltage divider circuit includes: a first resistor, a second resistor, a third resistor, a first diode, an acceleration subcircuit and a voltage stabilization subcircuit, wherein one end of the first resistor is electrically connected to the signal data processing module, the other end of the first resistor is electrically connected to one end of the acceleration subcircuit through a first node, the cathode of the first diode is electrically connected to the signal data processing module, the anode of the first diode is electrically connected to one end of the third resistor, the other end of the third resistor is electrically connected to the first node, the other end of the acceleration subcircuit is electrically connected to one end of the voltage stabilization subcircuit and the gate of the gallium nitride transistor in the half-bridge inverter circuit through a second node, the second resistor is electrically connected between the first node and the second node, the other end of the voltage stabilization subcircuit is electrically connected to the second electrode of the gallium nitride transistor in the half-bridge inverter circuit, the first electrode of the gallium nitride transistor in the half-bridge inverter circuit is electrically connected to the power module, 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.

5. The motor control system according to claim 4, characterized in that: The voltage stabilizing subcircuit includes: a first voltage stabilizing transistor, a second diode and a third diode, wherein a cathode of the first voltage stabilizing transistor is electrically connected to the second node, an anode of the first voltage stabilizing transistor is electrically connected to the third node, a cathode of the second diode and an anode of the third diode are both electrically connected to the third node, and an anode of the second diode and a cathode of the third diode are both electrically connected to the second electrode of the gallium nitride transistor in the half-bridge inverter circuit.

6. The motor control system according to claim 1, characterized in that: The inverter module includes a plurality of protection circuits, one end of a group of the protection circuits is electrically connected to a group of internal coils of the motor, and the other end of the protection circuits is grounded.

7. The motor control system according to claim 6, characterized in that: The protection circuit includes a fourth resistor and a first capacitor connected in series.

8. The motor control system according to claim 1, characterized in that: Also includes: A sampling feedback module, the sampling feedback module includes multiple groups of current sampling circuits and multiple groups of voltage sampling circuits, one end of a group of voltage sampling circuits is electrically connected to a group of internal coils of the motor, and the other end of the voltage sampling circuit is grounded; one end of the current sampling circuit is electrically connected one-to-one with the half-bridge inverter circuit, and the other end of the current sampling circuit is grounded.

9. The motor control system according to claim 8, characterized in that: The number of groups of the half-bridge inverter circuits is equal to the number of groups of internal coils of the motor.

10. The motor control system according to claim 2, characterized in that: The numbers of the gallium nitride transistors included in the upper bridge inverter circuit and the lower bridge inverter circuit are equal, and the numbers of the gallium nitride transistors included in the upper bridge inverter circuit and the lower bridge inverter circuit are both positively correlated with the power of the motor.

11. A motor control method, characterized in that: Applied to the motor control system according to any one of claims 1 to 10, the control method comprises: Control the signal data processing module to provide a control signal to the half-bridge driving circuit, so that the half-bridge voltage divider circuit provides a driving signal to the inverter module under the action of the control signal; Under the action of the driving signal, the inverter module is controlled to drive the motor.

12. The motor control method according to claim 11, characterized in that: In the case where the motor control system includes a sampling circuit, the controlling the inverter module to drive the motor includes: Using the current sampling circuit to perform current sampling on the inverter module to obtain a current sampling signal; Using the voltage sampling circuit to sample the voltage of the internal coil of the motor to obtain a voltage sampling signal; Edge detection is performed on the current sampling signal and the voltage sampling signal to adjust the control signal based on the edge detection result.

13. An electronic device, characterized in that: The computer program comprises a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used to execute the motor control method according to claim 11 or 12 when the processor is running.

14. A storage medium, characterized in that: Program instructions are stored on the storage medium, and the program instructions are used to execute the motor control method according to claim 11 or 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 as claimed in any one of claims 1 to 10.

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