Brushless motor drive control circuit and device for integrated blowing and sucking machine

Abstract

This invention relates to the field of blow-dryer / vacuum combos, and more particularly to a brushless motor drive control circuit and device for such combos. The circuit includes a microcontroller, a voltage detection unit, and a driver chip. When the user presses the mode switch button, the microcontroller outputs a voltage detection signal to the voltage detection unit. The voltage detection unit detects the voltage waveform of the power supply and outputs a mode switch signal to the microcontroller when the voltage waveform crosses zero. The microcontroller outputs a PWM signal corresponding to either the blow-drying or vacuuming mode to the driver chip based on the mode switch signal. The driver chip controls the direction of the brushless motor, thus switching between the blow-drying and vacuuming modes of the blow-dryer / vacuum combo. This circuit, by switching modes when the voltage waveform crosses zero, effectively reduces current surges, electromagnetic interference, and motor losses, thereby improving system stability and extending equipment lifespan.

Description

Technical Field

[0001] This invention relates to the field of blow-vacuum integrated machine technology, and in particular to a brushless motor drive control circuit and device for blow-vacuum integrated machines. Background Technology

[0002] Combination blower / vacuum cleaners, which combine blowing and vacuuming functions, are widely used in industrial cleaning and home tidying. The drive and control performance of their core component, the brushless motor, directly affects the equipment's efficiency, reliability, and lifespan. Traditional blower / vacuum cleaners typically switch between blowing and vacuuming modes by directly outputting control signals from a microcontroller to change the direction of the brushless motor. However, this control method for mode switching can easily lead to large current surges in the motor drive circuit, potentially causing electromagnetic interference, accelerated motor wear, overheating of the drive chip, and even decreased system stability, severely impacting the equipment's lifespan and user experience. Summary of the Invention

[0003] The main objective of this invention is to provide a brushless motor drive control circuit and device for a blow-dry combo machine. This invention aims to solve the technical problems that traditional blow-dry combos, when switching the direction of the brushless motor to achieve the switching between blowing and vacuuming modes by directly outputting control signals from a microcontroller, are prone to electromagnetic interference, increased motor wear, overheating of the drive chip, and decreased system stability due to large current surges, which affect the service life of the equipment and the user experience.

[0004] To achieve the above objectives, the present invention provides a brushless motor drive control circuit for a blow-vacuum combo machine, the circuit comprising: a microcontroller, a voltage detection unit, and a drive chip; The microcontroller is connected to the voltage detection unit, the mode switching button and the driver chip respectively. The voltage detection unit is connected to the power supply. The power supply is connected to the driver chip. The driver chip is connected to the brushless motor. The brushless motor is connected to the blow-and-vacuum combo machine. The microcontroller is used to output a voltage detection signal to the voltage detection unit when the user presses the mode switching button. The mode switching button is used to control the switching between the blowing mode and the vacuuming mode of the blower-vacuum combo machine. The voltage detection unit is used to detect the voltage waveform output by the power supply when it receives the voltage detection signal, and to output a mode switching signal to the microcontroller when the voltage waveform crosses zero. The voltage waveform is an AC voltage waveform of a preset frequency. The microcontroller is also configured to output a PWM signal corresponding to the blowing mode or the vacuuming mode to the driver chip when it receives the mode switching signal, so that the driver chip controls the direction of the brushless motor and completes the switching of the blowing mode or the vacuuming mode of the blower and vacuumer.

[0005] Optionally, the circuit further includes: a current detection unit; The current detection unit is connected to the microcontroller; The current detection unit is used to detect the output current of the power supply, and when the current value corresponding to the output current is less than the preset current value, it outputs a power supply insufficiency signal to the microcontroller. The microcontroller is further configured to stop outputting the PWM signal corresponding to the blowing mode or the vacuuming mode to the driver chip when it receives the insufficient power signal and the mode switching signal.

[0006] Optionally, the circuit further includes: a status display unit; The status display unit is connected to the microcontroller; The microcontroller is also used to output the insufficient power signal and the working status signal of the blow-and-vacuum combo machine to the status display unit; The status display unit is used to indicate the working status of the blow-and-suction machine.

[0007] Optionally, the microcontroller is further configured to, upon receiving a power-off signal from the blow-vacuum combo machine, control the voltage detection unit to detect the voltage waveform output by the power supply, and control the drive chip to stop the operation of the brushless motor when the voltage waveform crosses zero.

[0008] Optionally, the circuit further includes: a voltage divider unit and a voltage regulator unit; The voltage divider unit is connected to both the power supply and the voltage regulator unit, and the voltage regulator unit is connected to the voltage detection unit. The voltage divider unit is used to divide the power supply voltage provided by the power supply to obtain a divided voltage, and send the divided voltage to the voltage regulator unit; The voltage stabilizing unit is used to stabilize the voltage divider and send the stabilized voltage divider to the voltage detection unit; The voltage detection unit is also used to adjust the regulated voltage divider to obtain the voltage value corresponding to the voltage waveform output by the power supply, and output a mode switching signal to the microcontroller when the voltage value crosses zero.

[0009] Optionally, the voltage detection unit includes: a first resistor and a first comparator; The first end of the first resistor is connected to the power supply through the voltage regulator and the voltage divider; the second end of the first resistor is connected to the positive input of the first comparator; the negative input of the first comparator is connected to the first preset reference power supply; and the output of the first comparator is connected to the microcontroller.

[0010] Optionally, the voltage divider unit includes: a second resistor and a third resistor; The first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the first end of the first resistor, the first end of the third resistor and the voltage regulator unit, and the second end of the third resistor is grounded.

[0011] Optionally, the voltage regulating unit includes: a first capacitor; Wherein, the first terminal of the first capacitor is connected to the first terminal of the third resistor, and the second terminal of the first capacitor is grounded.

[0012] Optionally, the current detection unit includes: a fourth resistor and a second comparator; The first end of the fourth resistor is connected to the power supply, the second end of the fourth resistor is connected to the positive input of the second comparator, the inverting input of the second comparator is connected to the second preset reference power supply, and the output of the second comparator is connected to the microcontroller.

[0013] In addition, to achieve the above objectives, the present invention also proposes a brushless motor drive control device for a blow-dry machine, wherein the brushless motor drive control device for the blow-dry machine includes the brushless motor drive control circuit for the blow-dry machine described above.

[0014] In this invention, the brushless motor drive control circuit for a blow-dryer includes a microcontroller, a voltage detection unit, and a driver chip. The microcontroller is connected to the voltage detection unit, a mode switching button, and the driver chip. The voltage detection unit is connected to a power supply, the power supply is connected to the driver chip, the driver chip is connected to the brushless motor, and the brushless motor is connected to the blow-dryer. When the user presses the mode switching button, the microcontroller outputs a voltage detection signal to the voltage detection unit. The voltage detection unit detects the voltage waveform of the power supply and outputs a mode switching signal to the microcontroller when the voltage waveform crosses zero. The microcontroller outputs a PWM signal corresponding to either the blowing mode or the vacuuming mode to the driver chip based on the mode switching signal. The driver chip controls the direction of the brushless motor, thus switching between the blowing and vacuuming modes of the blow-dryer. This circuit effectively reduces current surges, electromagnetic interference, and motor losses by switching modes when the voltage waveform crosses zero, thereby improving system stability and equipment lifespan. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first embodiment of the brushless motor drive control circuit for a blow-and-vacuum combo machine of the present invention; Figure 2 This is a schematic diagram of the second embodiment of the brushless motor drive control circuit for a blow-and-suction machine of the present invention; Figure 3 This is a circuit diagram of the brushless motor drive control circuit for a blow-and-vacuum combo machine according to the present invention.

[0016] Explanation of icon numbers: label name label name 10 microcontroller 20 Voltage detection unit 30 driver chip 40 Current detection unit 50 Status display unit 60 Voltage divider unit R1~R4 First to fourth resistors 70 voltage regulator unit A1~A2 First and second comparators C1 First capacitor Vref1~Vref2 First and second preset reference power supplies V1 Power supply The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0021] This invention provides a brushless motor drive control circuit for a blow-and-vacuum combo machine, referring to... Figure 1 As shown, Figure 1 This is a schematic diagram of the first embodiment of the brushless motor drive control circuit for a blow-dry machine according to the present invention. The brushless motor drive control circuit for a blow-dry machine according to the present invention includes: a microcontroller 10, a voltage detection unit 20, and a drive chip 30; The microcontroller 10 is connected to the voltage detection unit 20, the mode switching button and the driver chip 30 respectively. The voltage detection unit 20 is connected to the power supply V1. The power supply V1 is connected to the driver chip 30. The driver chip 30 is connected to the brushless motor. The brushless motor is connected to the blow-and-vacuum combo machine. The microcontroller 10 is used to output a voltage detection signal to the voltage detection unit 20 when the user presses the mode switching button. The mode switching button is used to control the switching between the blowing mode and the vacuuming mode of the blower and vacuuming machine. The voltage detection unit 20 is used to detect the voltage waveform output by the power supply V1 when it receives the voltage detection signal, and output a mode switching signal to the microcontroller 10 when the voltage waveform crosses zero. The voltage waveform is an AC voltage waveform of a preset frequency. The microcontroller 10 is also configured to output a PWM signal corresponding to the blowing mode or the vacuuming mode to the driver chip 30 when it receives the mode switching signal, so that the driver chip 30 controls the direction of the brushless motor and completes the switching of the blowing mode or the vacuuming mode of the blower and vacuumer.

[0022] It should be noted that the microcontroller 10 receives the mode switching command input by the user via the mode switching button, triggers the voltage detection process, and outputs a voltage detection signal to the voltage detection unit 20. After the user presses the button, it waits for the zero-crossing signal of the voltage waveform fed back by the voltage detection unit 20, i.e., the mode switching signal, to ensure that the mode switching occurs when there is no sudden change in the power supply voltage. Based on the received mode switching signal, it outputs the corresponding mode (blowing or vacuuming) PWM (Pulse Width Modulation) signal to the driver chip 30 to control the direction of the brushless motor. The microcontroller 10 can avoid current surges through timing control, realizing the logical decision-making and signal coordination of mode switching.

[0023] The voltage detection unit 20 is directly connected to the power supply V1 and continuously or trigger-basedly detects the voltage waveform output by the power supply, such as the amplitude change of AC or pulsating DC voltage. Upon receiving the voltage detection signal from the microcontroller 10, it locks onto and monitors the voltage waveform. When it detects a zero-crossing point (where the voltage change rate is zero and current surge is minimal) during the transition from the positive half-cycle to the negative half-cycle or vice versa, it outputs a mode switching signal to the microcontroller 10. The voltage detection unit 20 provides the microcontroller 10 with precise mode switching timing, ensuring that the power supply is in a low-energy-fluidity state during brushless motor rotation switching, reducing current surges and electromagnetic interference.

[0024] For example, if the power supply V1 is 50Hz AC, the voltage waveform period is 20ms, with 10ms for each of the positive and negative half-cycles, and a zero-crossing point occurring every 10ms, alternating between positive and negative zero-crossing points. The microcontroller records the zero-crossing time t0 and determines whether it is a valid zero-crossing point, such as checking if the time interval is close to 10ms. After confirming its validity, a preset time, such as 1ms, can be delayed to ensure that the current has approached zero, and the PWM signal corresponding to the vacuuming mode or blowing mode is output to the driver chip 30. The driver chip 30 switches the motor phase sequence and changes the direction of rotation according to the PWM signal to complete the mode switching.

[0025] The driver chip 30 connects to the power supply V1 and the brushless motor, acting as a power amplification device to convert the low-level control signal from the microcontroller 10 into a high-power signal for driving the motor. The driver chip 30 can receive the PWM signal output from the microcontroller 10 and control the rotation direction (forward or reverse) of the brushless motor by adjusting the current direction and phase of the motor windings, thereby switching between the blowing mode (motor blowing air forward) and the vacuuming mode (motor sucking air backward) of the blower / vacuum combo. As the power hub for motor driving, the driver chip 30 executes the steering commands from the microcontroller 10, realizing the switching of physical functions.

[0026] It should be understood that the mode switching button serves as a user input interface, triggering the microcontroller 10 to initiate the mode switching process. Power supply V1 provides energy to the driver chip 30 and the brushless motor, and its voltage status is monitored by the voltage detection unit 20. The brushless motor and the blow-and-vacuum combo unit are controlled by the driver chip 30, and the device's function is switched through changes in direction. In addition, the circuit may also include a wind speed adjustment unit, an LED lighting unit, and a power bank charging unit. The wind speed adjustment unit receives wind speed adjustment commands input by the user and transmits the commands to the microcontroller. The microcontroller adjusts the duty cycle of the PWM signal output to the driver chip according to the wind speed adjustment commands to control the speed of the brushless motor and achieve stepless wind speed adjustment. The LED lighting unit is connected to the microcontroller and controls the LED lights to turn on, off, and adjust their brightness according to the lighting control signals output by the microcontroller, providing auxiliary lighting when the blow-dry machine is working. The power bank charging unit is connected to the power supply and provides charging functionality for external mobile devices through the power supply when the blow-dry machine is working, supporting multiple charging protocols and voltage compatibility.

[0027] Furthermore, referring to Figure 2 The circuit further includes: a current detection unit 40; The current detection unit 40 is connected to the microcontroller 10; The current detection unit 40 is used to detect the output current of the power supply V1, and when the current value corresponding to the output current is less than the preset current value, it outputs a power supply insufficiency signal to the microcontroller 10. The microcontroller 10 is also configured to stop outputting the PWM signal corresponding to the blowing mode or the vacuuming mode to the driver chip 30 when it receives the insufficient power signal and the mode switching signal.

[0028] It should be noted that the current detection unit 40 is directly connected to the output circuit of the power supply V1, and collects the output current signal of the power supply in real time, converting it into an electrical signal that can be recognized by the microcontroller 10. By continuously monitoring the current value, this unit can dynamically evaluate the power supply capacity, such as determining whether the battery power is sufficient or whether the power supply is in an overload state. When the output current value of the power supply V1 is detected to be less than a preset current value, which can be set according to the minimum current threshold required for normal start-up or mode switching of the brushless motor, the current detection unit 40 will determine that the current power supply is in a state of insufficient power supply and output an insufficient power supply signal to the microcontroller 10.

[0029] It should be understood that the microcontroller 10 will only output a PWM signal to control the motor direction when it simultaneously receives a voltage waveform zero-crossing signal (mode switching signal) and a normal power supply signal (i.e., no insufficient power supply signal is received). If insufficient power supply is detected during mode switching (such as a sudden drop in current at the moment of switching), the microcontroller 10 will immediately stop outputting the PWM signal, blocking the motor direction switching. This mechanism avoids the following risks: forcibly switching modes when the power supply is insufficient may cause the motor to fail to start normally or stall, exacerbating motor losses; when the power supply is insufficient, the driver chip 30 may overheat due to forced power output, even causing component burnout or system crash.

[0030] Specifically, refer to Figure 3 The current detection unit 40 includes: a fourth resistor R4 and a second comparator A2; The first end of the fourth resistor R4 is connected to the power supply V1, the second end of the fourth resistor R4 is connected to the positive input of the second comparator A2, the inverting input of the second comparator A2 is connected to the second preset reference power supply Vref2, and the output of the second comparator A2 is connected to the microcontroller 10.

[0031] It should be noted that the fourth resistor R4 is a current sampling resistor, serving as a current-to-voltage conversion element. Connected in series in the output circuit of the power supply V1, it converts the output current of power supply V1 into a voltage signal through its own resistance. The second comparator A2 is a voltage comparison and logic output element. Its positive input receives the voltage signal converted by the fourth resistor R4, reflecting the real-time current magnitude. Its inverting input is connected to the second preset reference power supply Vref2, providing a fixed reference voltage corresponding to the preset current value. Its output is connected to the microcontroller 10, outputting a logic signal based on the voltage comparison result: when the real-time current is greater than or equal to the preset current, the comparator outputs a high level, indicating normal power supply; when the real-time current is less than the preset current, the comparator outputs a low level, triggering the microcontroller 10 to switch to interrupt mode as a power supply insufficiency signal.

[0032] Furthermore, referring to Figure 2 The circuit further includes: a status display unit 50; The status display unit 50 is connected to the microcontroller 10; The microcontroller 10 is also used to output the power shortage signal and the working status signal of the blow-and-vacuum machine to the status display unit 50; The status display unit 50 is used to indicate the working status of the blow-and-suction machine.

[0033] It should be noted that the status display unit 50 is directly connected to the microcontroller 10, receiving power shortage signals and operating status signals. The power shortage signal originates from the logic signal of the current detection unit 40; a low level indicates insufficient power supply V1, such as low battery or power failure. The operating status signal comes from the mode commands of the microcontroller 10, such as blower mode or vacuuming mode, reflecting the current operating status of the blower / vacuum combo. The status display unit 50 can visually display the device status to the user using lights, characters, or graphics.

[0034] Furthermore, the microcontroller 10 is also used to control the voltage detection unit 20 to detect the voltage waveform output by the power supply V1 when it receives the power off signal of the blow-vacuum machine, and to control the drive chip 30 to stop the operation of the brushless motor when the voltage waveform crosses zero.

[0035] It should be noted that during operation, brushless motors contain dynamic current and magnetic field energy in their windings. If the drive signal is directly cut off, the motor windings will generate back electromotive force (induced voltage) due to electromagnetic induction, which may lead to the following problems: the back electromotive force may generate instantaneous high voltage on components such as the drive chip 30 and capacitors, which can easily cause breakdown or aging over time; sudden current changes will generate high-frequency noise, interfering with other circuits or peripheral equipment. Through voltage zero-crossing detection, the microcontroller 10 ensures that the drive chip 30 stops outputting when the power supply V1 voltage naturally crosses zero (at which point the power supply energy is at its lowest and the motor current approaches zero), allowing the motor winding current to naturally return to zero as the power supply voltage decays, avoiding sudden energy changes caused by a hard power cut.

[0036] Furthermore, referring to Figure 2 The circuit further includes a voltage divider unit 60 and a voltage regulator unit 70; The voltage divider unit 60 is connected to the power supply V1 and the voltage regulator unit 70 respectively, and the voltage regulator unit 70 is connected to the voltage detection unit 20. The voltage divider unit 60 is used to divide the power supply voltage provided by the power supply V1 to obtain a divided voltage, and send the divided voltage to the voltage regulator unit 70. The voltage stabilizing unit 70 is used to stabilize the voltage divider and send the stabilized voltage divider to the voltage detection unit 20; The voltage detection unit 20 is also used to adjust the regulated voltage divider to obtain the voltage value corresponding to the voltage waveform output by the power supply V1, and output a mode switching signal to the microcontroller 10 when the voltage value crosses zero.

[0037] It should be noted that the voltage divider unit 60 can proportionally convert the high voltage of the power supply V1 into a low voltage (divided voltage) through a resistor divider network (such as a series resistor) to adapt it to the input range of subsequent circuits. The voltage regulator unit 70 regulates the divided voltage output by the voltage divider unit 60 to eliminate voltage ripple caused by power fluctuations, load changes, and other factors.

[0038] Specifically, refer to Figure 3 The voltage detection unit 20 includes: a first resistor R1 and a first comparator A1; The first end of the first resistor R1 is connected to the power supply V1 through the voltage regulator unit 70 and the voltage divider unit 60. The second end of the first resistor R1 is connected to the positive input terminal of the first comparator A1. The inverting input terminal of the first comparator A1 is connected to the first preset reference power supply Vref1. The output terminal of the first comparator A1 is connected to the microcontroller 10.

[0039] It should be noted that the first resistor R1 is connected in series between the voltage regulator unit 70 and the positive input terminal of the first comparator A1 to condition the regulated voltage divider (reflecting the voltage waveform of the power supply V1). The positive input terminal of the first comparator A1 receives the regulated voltage divider through the first resistor R1. The inverting input terminal is connected to the first preset reference power supply Vref1, which can be a zero-voltage reference, i.e., grounded, and serves as the threshold for zero-crossing detection.

[0040] Specifically, refer to Figure 3 The voltage divider unit 60 includes a second resistor R2 and a third resistor R3; wherein, the first end of the second resistor R2 is connected to the power supply V1, the second end of the second resistor R2 is connected to the first end of the first resistor R1, the first end of the third resistor R3, and the voltage regulator unit 70, and the second end of the third resistor R3 is grounded. The voltage regulator unit 70 includes a first capacitor C1; wherein, the first end of the first capacitor C1 is connected to the first end of the third resistor R3, and the second end of the first capacitor C1 is grounded.

[0041] Furthermore, to achieve the above objectives, the present invention also proposes a brushless motor drive control device for a blow-drying machine, wherein the brushless motor drive control device for the blow-drying machine includes the brushless motor drive control circuit for the blow-drying machine described above. The specific structure of this brushless motor drive control circuit for the blow-drying machine is as described in the above embodiments. Since this brushless motor drive control device for the blow-drying machine adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0042] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A brushless motor drive control circuit for a blow-and-vacuum combo machine, characterized in that, The circuit includes: a microcontroller, a voltage detection unit, and a driver chip; The microcontroller is connected to the voltage detection unit, the mode switching button and the driver chip respectively. The voltage detection unit is connected to the power supply. The power supply is connected to the driver chip. The driver chip is connected to the brushless motor. The brushless motor is connected to the blow-and-vacuum combo machine. The microcontroller is used to output a voltage detection signal to the voltage detection unit when the user presses the mode switching button. The mode switching button is used to control the switching between the blowing mode and the vacuuming mode of the blower-vacuum combo machine. The voltage detection unit is used to detect the voltage waveform output by the power supply when it receives the voltage detection signal, and to output a mode switching signal to the microcontroller when the voltage waveform crosses zero. The voltage waveform is an AC voltage waveform of a preset frequency. The microcontroller is also configured to output a PWM signal corresponding to the blowing mode or the vacuuming mode to the driver chip when it receives the mode switching signal, so that the driver chip controls the direction of the brushless motor and completes the switching of the blowing mode or the vacuuming mode of the blower and vacuumer.

2. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 1, characterized in that, The circuit also includes: a current detection unit; The current detection unit is connected to the microcontroller; The current detection unit is used to detect the output current of the power supply, and when the current value corresponding to the output current is less than the preset current value, it outputs a power supply insufficiency signal to the microcontroller. The microcontroller is further configured to stop outputting the PWM signal corresponding to the blowing mode or the vacuuming mode to the driver chip when it receives the insufficient power signal and the mode switching signal.

3. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 2, characterized in that, The circuit also includes: a status display unit; The status display unit is connected to the microcontroller; The microcontroller is also used to output the insufficient power signal and the working status signal of the blow-and-vacuum combo machine to the status display unit; The status display unit is used to indicate the working status of the blow-and-suction machine.

4. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 1, characterized in that, The microcontroller is also used to control the voltage detection unit to detect the voltage waveform output by the power supply when it receives the power-off signal of the blow-vacuum combo machine, and to control the drive chip to stop the operation of the brushless motor when the voltage waveform crosses zero.

5. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 1, characterized in that, The circuit also includes: a voltage divider unit and a voltage regulator unit; The voltage divider unit is connected to both the power supply and the voltage regulator unit, and the voltage regulator unit is connected to the voltage detection unit. The voltage divider unit is used to divide the power supply voltage provided by the power supply to obtain a divided voltage, and send the divided voltage to the voltage regulator unit; The voltage stabilizing unit is used to stabilize the voltage divider and send the stabilized voltage divider to the voltage detection unit; The voltage detection unit is also used to adjust the regulated voltage divider to obtain the voltage value corresponding to the voltage waveform output by the power supply, and output a mode switching signal to the microcontroller when the voltage value crosses zero.

6. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 5, characterized in that, The voltage detection unit includes: a first resistor and a first comparator; The first end of the first resistor is connected to the power supply through the voltage regulator and the voltage divider; the second end of the first resistor is connected to the positive input of the first comparator; the negative input of the first comparator is connected to the first preset reference power supply; and the output of the first comparator is connected to the microcontroller.

7. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 6, characterized in that, The voltage divider unit includes: a second resistor and a third resistor; The first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the first end of the first resistor, the first end of the third resistor and the voltage regulator unit, and the second end of the third resistor is grounded.

8. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 7, characterized in that, The voltage stabilizing unit includes: a first capacitor; Wherein, the first terminal of the first capacitor is connected to the first terminal of the third resistor, and the second terminal of the first capacitor is grounded.

9. The brushless motor drive control circuit for a blow-and-vacuum combo machine as described in claim 2, characterized in that, The current detection unit includes: a fourth resistor and a second comparator; The first end of the fourth resistor is connected to the power supply, the second end of the fourth resistor is connected to the positive input of the second comparator, the inverting input of the second comparator is connected to the second preset reference power supply, and the output of the second comparator is connected to the microcontroller.

10. A brushless motor drive control device for a blow-and-vacuum combo machine, characterized in that, The brushless motor drive control device for the blow-dry machine includes the brushless motor drive control circuit for the blow-dry machine as described in any one of claims 1 to 9.

Images