Composite dust collector control circuit, regulation and control method and composite dust collector

Abstract

The invention provides a composite dust collector control circuit, a regulation and control method and a composite dust collector, the composite dust collector control circuit comprises a ground brush state detection circuit, the ground brush state detection circuit comprises a first MOS tube, a voltage dividing module, a voltage dividing diode and a ground brush access detection end, the voltage dividing module comprises a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor, the first divider resistor and the second divider resistor are arranged in parallel, the third divider resistor is connected with a ground brush between the first divider resistor and the second divider resistor, and the third divider resistor is connected with the first divider resistor in series and is connected with the second divider resistor in parallel; and the switch control circuit comprises a second diode, a third triode, a third MOS tube, a fourth triode and a control key. The circuit control system of the composite dust collector has remarkable advantages in the aspects of switch control, ground brush state detection, circuit protection, current detection, charging management and the like, more convenient, safer and more reliable use experience can be provided for a user, and meanwhile the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum cleaners, and particularly to a control circuit for a composite vacuum cleaner, a regulation method, and a composite vacuum cleaner. Background Art

[0002] In the field of modern household cleaning, vacuum cleaners have become an indispensable tool. Their working states generally cover two modes: handheld and push-rod, to meet diverse cleaning needs. The handheld mode has significant advantages in dealing with cleaning tasks in specific areas such as high corners, furniture gaps, and curtain surfaces due to its light and convenient characteristics; the push-rod mode performs well in cleaning large areas of the floor because of its larger cleaning coverage area and labor-saving operation method.

[0003] However, there are obvious deficiencies in the working state detection and switching mechanism of current vacuum cleaners on the market. Regarding the working state detection, the host often makes incorrect judgments on whether it is in the handheld state or the push-rod state. Its detection means often rely on simple sensors or mechanical structures, and it is difficult to accurately identify complex and changeable usage scenarios. For example, when the user holds the vacuum cleaner by hand, if it is accidentally shaken or the holding angle is changed, the existing detection system may misjudge it as switching to the push-rod state; in the push-rod mode, if the connection part between the push-rod and the host is slightly loose or there is a slight vibration during movement, it is also easy to cause detection errors, resulting in the identification of the working state not matching the actual situation.

[0004] In terms of the switching and adjustment of the working state, the response of existing vacuum cleaners is not sensitive enough. When the user switches from the handheld mode to the push-rod mode, or vice versa, key components such as the main motor and the suction adjustment system cannot make rapid and accurate adaptive adjustments. For example, after switching from the handheld mode to the push-rod mode, the main motor fails to promptly increase the power to meet the greater suction requirement for floor cleaning, resulting in poor cleaning effect; when switching back from the push-rod mode to the handheld mode, the suction adjustment system cannot quickly reduce the suction, which not only causes energy waste but also may damage some fragile cleaning objects due to excessive suction. In addition, during the state switching process, problems such as unstable motor speed and increased working noise may also occur, seriously affecting the user experience. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that it is difficult to accurately identify the operation state and current of a composite vacuum cleaner, and to provide a control circuit for a composite vacuum cleaner, a regulation method, and a composite vacuum cleaner.

[0006] To solve the above technical problems, the present invention provides a composite vacuum cleaner control circuit, which includes: a floor brush status detection circuit. The status detection circuit is connected to a floor brush adapter and includes a first MOS transistor, a voltage dividing module, a voltage dividing diode, and a floor brush access detection terminal. The voltage dividing diode is arranged between the first MOS transistor and the voltage dividing module. The voltage dividing module includes a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor. Among them, the first voltage dividing resistor and the second voltage dividing resistor are arranged in parallel, the third voltage dividing resistor is connected to the floor brush, the floor brush access detection terminal is arranged between the first voltage dividing resistor and the second voltage dividing resistor, the third voltage dividing resistor is connected in series with the first voltage dividing resistor and is connected in parallel with the second voltage dividing resistor; a switch control circuit, which includes a second diode, a third triode, a third MOS transistor, a fourth triode, and a control key. The control key is connected to the battery and is connected to the input terminal of the third triode. The output terminal of the third triode is connected to the source electrode of the third MOS transistor. The drain electrode of the third MOS transistor is connected to the input terminal of the second diode. The output terminal of the second diode is connected to the fourth triode. The fourth triode is connected to the power supply to supply power to the buck chip.

[0007] In an embodiment of the present invention, the floor brush status detection circuit further includes a second MOS transistor and a second triode Q9. The second MOS transistor is connected to the first MOS transistor and the second triode Q9. The second triode Q9 is connected to a floor brush signal receiving port.

[0008] In an embodiment of the present invention, the composite vacuum cleaner control circuit further includes a current detection circuit. The current detection circuit is connected to the floor brush adapter and includes a first diode, a first triode, and a charging MOS transistor. The first triode and the charging MOS transistor are respectively connected to the negative electrode of the first diode. The charging MOS transistor adjusts its on-off through the first triode. The battery pack is respectively connected to the charging MOS transistor and the first MOS transistor.

[0009] In an embodiment of the present invention, the composite vacuum cleaner control circuit further includes a switch control circuit. The switch control circuit is connected to the floor brush adapter and includes a second diode, a third triode, a third MOS transistor, a fourth triode, and a control key. The control key can be grounded and is connected to the input terminal of the third triode. The output terminal of the third triode is connected to the source electrode of the third MOS transistor. The drain electrode of the third MOS transistor is connected to the input terminal of the second diode. The output terminal of the second diode is connected to the fourth triode. The fourth triode is connected to the power supply.

[0010] In an embodiment of the present invention, the switch control circuit further includes a buck chip and a sampling pin. The buck chip is connected to the power supply to drive the single-chip microcomputer, and the sampling pin is connected to the control key to collect the voltage of the control key.

[0011] In an embodiment of the present invention, the floor brush status detection circuit further includes a fuse. The floor brush adapter is connected with terminals. The fuse is arranged between the first MOS transistor and the floor brush adapter. When the floor brush is in the working state, the current sequentially passes through the battery pack, the first MOS transistor, the fuse, the input end of the floor brush adapter, the terminal, the output end of the floor brush adapter, and the third voltage-dividing resistor and then is grounded.

[0012] In an embodiment of the present invention, the floor brush status detection circuit further includes a floor brush current sampling terminal. The floor brush current sampling terminal is connected to the third voltage-dividing resistor and a current amplifier to calculate the floor brush current.

[0013] The present invention also provides a method for regulating a composite vacuum cleaner, which uses the above-mentioned composite vacuum cleaner control circuit to perform status detection and current detection of the vacuum cleaner. Among them, the status detection of the vacuum cleaner includes: Step S1, after connecting the status detection circuit, supply power to the status detection circuit; Step S2, measure the current at the floor brush current sampling terminal before use to obtain a first reference current value; Step S3, during use, continuously detect the current at the floor brush current sampling terminal in real time to obtain a real-time monitoring value; Step S4, compare the real-time monitoring value with the first reference current value. When the real-time monitoring value < the first reference current value, the vacuum cleaner is in the handheld mode; otherwise, the vacuum cleaner is in the push rod mode. The current detection of the vacuum cleaner includes: Step a, collect the current at the third voltage-dividing resistor to obtain a second reference current value; Step b, amplify and calculate the second reference current value and judge its positive or negative. When the second reference current value is a negative current, the vacuum cleaner is in the charging state; when the second reference current value is a positive current, the vacuum cleaner is in the working state.

[0014] In an embodiment of the present invention, when the vacuum cleaner is in the charging state, the charging voltage is monitored in real time, and a signal is fed back to adjust the working state of the charging circuit.

[0015] The present invention also provides a composite vacuum cleaner, which includes the above-mentioned composite vacuum cleaner control circuit.

[0016] The above technical solution of the present invention has the following advantages compared with the prior art: The composite vacuum cleaner control circuit, regulation method and composite vacuum cleaner according to the present invention can accurately detect the change of the voltage division value by using the floor brush state detection circuit, and can timely and accurately judge the state of the floor brush. When the floor brush is inserted or removed, the voltage division value at the floor brush current acquisition end will change significantly, and the MCU can quickly capture these changes and make corresponding control decisions to protect the motor and circuit in time, effectively extending the service life of the device and reducing the maintenance cost. The current detection circuit of the present invention can monitor the charging voltage in real time and use it as a feedback signal to adjust the working state of the charging circuit. In this way, it can ensure that the voltage of the battery pack is always within a safe range during the charging process, avoid problems such as overcharging, improve the safety and reliability of the charging process, and extend the service life of the battery pack. In summary, the composite vacuum cleaner circuit control system of the present invention has significant advantages in switch control, floor brush state detection, circuit protection, current detection and charging management, can provide users with a more convenient, safe and reliable use experience, and at the same time reduce production costs, and has high market application value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to the specific embodiments of the present invention and in conjunction with the drawings.

[0018] Figure 1 is the control circuit diagram of the composite vacuum cleaner in the preferred embodiment of the present invention; Figure 2 is Figure 1 the internal circuit diagram of the control chip in the shown composite vacuum cleaner control circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0020] Embodiment 1:

[0021] This embodiment provides a composite vacuum cleaner control circuit, which includes: a floor brush status detection circuit for detecting whether the vacuum cleaner is in the handheld mode or the push rod mode. The status detection circuit is connected to the floor brush adapter and includes a first MOS transistor Q4, a voltage division module, a voltage division diode D7, and a floor brush access detection terminal. The voltage division diode D7 is arranged between the first MOS transistor Q4 and the voltage division module. The voltage division module includes a first voltage division resistor R12, a second voltage division resistor R18, and a third voltage division resistor R14. Among them, the first voltage division resistor R12 and the second voltage division resistor R18 are arranged in parallel, the third voltage division resistor R14 is connected to the floor brush B1, the floor brush access detection terminal AD-V-Stick is arranged between the first voltage division resistor R12 and the second voltage division resistor R18, the third voltage division resistor R14 is arranged in series with the first voltage division resistor R12 and in parallel with the second voltage division resistor R18; See Figure 1 As shown, the floor brush status detection circuit in this embodiment further includes a second MOS transistor Q8 and a second triode Q9. The second MOS transistor Q8 is connected to the first MOS transistor Q4 and the second triode Q9, and the second triode Q9 is connected to the floor brush signal receiving port. Among them, the second MOS transistor Q8 is connected to the first MOS transistor Q4, and its on and off states can be determined by controlling its gate voltage. When it is necessary to control the floor brush status detection circuit, by changing the gate signal of the second MOS transistor Q8, the current path from the first MOS transistor Q4 to the subsequent circuit can be flexibly cut off or connected.

[0022] During the operation of the floor brush, due to reasons such as the start, stop of the motor or external interference, a back electromotive force may be generated, resulting in a tendency for the current to flow backward. If not prevented, the backward flowing current may damage other components in the floor brush status detection circuit and even affect the entire vacuum cleaner control circuit. The second triode Q9 cooperates with the freewheeling diode to prevent the backward flowing current, ensuring that the current can only flow from the floor brush signal receiving port to other parts of the circuit in the normal direction and protecting the circuit safety. Further, the floor brush status detection circuit further includes a freewheeling diode, and the output end of the freewheeling diode is connected to the first MOS transistor Q4. The floor brush is usually driven by a motor, and the motor is an inductive load.

[0023] During the operation of the motor, current passes through the inductor coil to generate a magnetic field and store energy. When the first MOS transistor Q4 is turned off, the current in the motor inductor cannot disappear instantaneously. According to Lenz's law, the inductor will generate an induced electromotive force in the opposite direction to the original current, attempting to maintain the current unchanged. Without a freewheeling diode, this induced electromotive force will be superimposed on the power supply voltage and applied across the two ends of the first MOS transistor Q4, possibly generating an extremely high voltage spike, far exceeding the breakdown voltage of the first MOS transistor Q4, thus breaking down the first MOS transistor Q4 and damaging the entire circuit. After the freewheeling diode is connected to the output terminal of the first MOS transistor Q4, when the first MOS transistor Q4 is turned off, the induced current can form a loop through the freewheeling diode to release the energy in the inductor, avoiding damage to the first MOS transistor Q4 caused by excessive induced electromotive force and ensuring the normal operation of the circuit.

[0024] In addition, the ground brush status detection circuit further includes a fuse F1. The ground brush adapter is connected with terminals. The fuse F1 is arranged between the first MOS transistor Q4 and the ground brush adapter. When the ground brush is in the working state, the current sequentially passes through the battery pack, the first MOS transistor Q4, the fuse F1, the input end of the ground brush adapter, the terminal, the output end of the ground brush adapter, and the third voltage dividing resistor R14 and then is grounded, thereby forming a closed loop with a relatively high safety level. Specifically, in this embodiment, the ground brush status detection circuit further includes a ground brush current sampling terminal, and the ground brush current sampling terminal is connected to the third voltage dividing resistor R14 and a current amplifier to calculate the ground brush current.

[0025] When used alone as a handheld vacuum cleaner, the second triode Q9 and the access MOS transistor Q8 are both non-conductive. If the push rod connected to the ground brush is inserted at this time, the voltage division of the first voltage dividing resistor R12 and the second voltage dividing resistor R18 detected at the ground brush access detection terminal AD_V_stick will flow through the voltage dividing diode D7 to the A+ port of P2 in the ground brush adapter, then flow through the A+ port on it to the ground brush motor, and then flow through the ground brush motor to the third voltage dividing resistor R14. The internal resistance of the ground brush motor and the third voltage dividing resistor R14 are equivalent to being connected in parallel with the second voltage dividing resistor R18, resulting in a decrease in the voltage division value of the first voltage dividing resistor R12 and the second voltage dividing resistor R18 detected at the ground brush access detection terminal AD_V_stick. When the MCU detects the change in the voltage division value, it can determine that the ground brush motor has been inserted.

[0026] Furthermore, to prevent damage to the circuit caused by foreign objects inserted when there is still current in the circuit after the ground brush motor is pulled out, the control chip cuts off the power supply and the motor stops for protection after the voltage division value changes. Similarly, when the push rod connected to the ground brush is pulled out when used as a push rod vacuum cleaner, the circuit state is restored. After the MCU detects the change in the voltage division value, it controls the motor to stop. This circuit can detect the ground brush status at low cost.

[0027] See Figure 1 and Figure 2 As shown, the composite vacuum cleaner control circuit in this embodiment further includes a switch control circuit, which includes a second diode D3, a third triode Q5, a third MOS transistor Q2, a fourth triode Q1, and a control button K+. The control button K+ is connected to the battery and is connected to the input end of the third triode Q5. The output end of the third triode Q5 is connected to the source electrode of the third MOS transistor Q2. The drain electrode of the third MOS transistor Q2 is connected to the input end of the second diode D3. The output end of the second diode D3 is connected to the fourth triode Q1. The fourth triode Q1 is connected to the power supply to supply power to the step-down chip.

[0028] Specifically, when the control button K+ is pressed, the base of the third triode Q5 receives a low level to make it conduct. At this time, the source G electrode of the third MOS transistor Q2 receives a high level to make it conduct and continue to flow to its drain electrode. Based on the unidirectional conductivity of the diode, the second diode D3 conducts. At this time, the base of the fourth triode Q1 receives a high level to promote the conduction of the fourth triode Q1. At this time, the 12V power supply starts to supply power.

[0029] The supply current is supplied to the single-chip microcomputer after being stepped down to 3.3V by the step-down chip U1. After the single-chip microcomputer obtains the 3.3V power supply, it enters the working state and makes POWER SW continuously output a high level. Thus, based on the setting of the fifth triode Q6, even if the control button K+ is released, the single-chip microcomputer will still be powered on. This part of the circuit functions as a switch control circuit. Further, the switch control circuit in this embodiment further includes a step-down chip U1 and a sampling pin. The step-down chip U1 is connected to the power supply to drive the single-chip microcomputer. The sampling pin AD V KEY is connected to the control button K+ to collect the voltage of the control button K+.

[0030] Specifically, the sampling pin AD_V_KEY is used to detect the voltage value at the control button K+. The positive terminal port of the battery pack is connected to the port of the control button K+. After the control button K+ is pressed, it will be connected to GND. Thus, a voltage dividing circuit is connected between the third MOS transistor Q2 and the second diode D3. Then, the voltage of the battery pack can be obtained through the sampling value at the sampling pin AD_V_ba. In this embodiment, when the control chip is powered on, it will control the BRUSH_ONOFF port to output a low level to make the second triode Q9 conduct. The collector of the second triode Q9 outputs a high level to make the connected MOS transistor Q8 conduct. The drain electrode of the connected MOS transistor Q8 outputs a low level to make the first MOS transistor Q4 conduct. The current flows from the source electrode of the first MOS transistor Q4 to its drain electrode and continues to flow to the A+ port of P2 in the floor brush adapter, then flows to the floor brush through the A+ port, and then flows to GND through the negative electrode of the floor brush, thus forming a loop, thereby playing a role in controlling the floor brush circuit.

[0031] When performing current detection, the ground brush drives the current to flow from the positive pole of the battery pack to the first MOS transistor Q4, the fuse F1, and the terminal of the ground brush adapter in sequence and then to the ground brush B1 in the working state. The current flowing out from the ground brush B1 is grounded after passing through the third voltage-dividing resistor R14. The ground brush current sampling terminal can collect and amplify the tiny voltage drop on the third voltage-dividing resistor R14, thereby realizing the calculation of the actual working current. Further, when the battery pack is charging, the current flows from the positive pole of the charging port through the port CHG+ on the terminal P3 of the ground brush adapter, passes through the positive pole of the first diode D2 and flows through the negative pole. At this time, whether the charging MOS transistor Q3 is turned on can be controlled by controlling the conduction or cutoff of the first triode Q7. When the base of the first triode Q7 receives a low level, the first triode Q7 is cut off, its collector receives a low level, and when the charging current flows to the source of the charging MOS transistor Q3, the charging MOS transistor Q3 is turned on, and the current flows to the positive pole of the battery pack. At this time, BATT+ charges the battery pack, and the current flows out from the negative pole GND of the battery pack and then passes through the third voltage-dividing resistor R14, and finally flows to the negative pole of the charging port, thus forming a complete loop. Further, during the charging process, the current direction is opposite to that of the discharge loop, and the voltage from GND flowing out to both ends of the third voltage-dividing resistor R14 is a negative voltage. At this time, the current at the third voltage-dividing resistor is collected and amplified by the operational amplifier, and the ground brush current and the charging current can be detected simultaneously. Specifically, the operational amplifier in this embodiment is a non-inverting amplifier, so the voltage at the output terminal is in a proportional relationship with the voltage at the positive terminal of the input.

[0032] During the detection process, if the ground brush is in the working state, the current I2_Moto flowing through both ends of the third voltage-dividing resistor R14 is a positive current. According to the calculation formula of the non-inverting amplifier, it is deduced that the voltage of the output voltage AD_I_CHG_BRUSH is greater than 3.3V; if the current is in the battery pack charging state, the current I2_Moto flowing through both ends of the third voltage-dividing resistor R14 is a negative current, and the voltage of the output voltage AD_I_CHG_BRUSH is less than 3.3V. According to the voltage value detected at the pin AD_I_CHG_BRUSH, it can be calculated whether the voltage detected at the pin I2_Moto at this time is the voltage of the ground brush motor working or the charging voltage of the battery pack, and the specific voltage value can be obtained, realizing the simultaneous detection and calculation of two currents with one operational amplifier circuit. During this process, the AD_V_charger pin is used for charging voltage detection and feedback control, monitoring the charging voltage in real time to ensure the safety and reliability of the charging process, and adjusting the working state of the charging circuit as a feedback signal.

[0033] The composite vacuum cleaner control circuit further includes a current detection circuit, which is connected to the floor brush adapter and used for charging voltage detection and feedback control. The current detection circuit includes a first diode D2, a first triode Q7, and a charging MOS transistor Q3. The first triode Q7 and the charging MOS transistor Q3 are respectively connected to the negative electrode of the first diode D2. The charging MOS transistor Q3 adjusts its on / off state through the first triode Q7. The battery pack is respectively connected to the charging MOS transistor Q3 and the first MOS transistor Q4.

[0034] Embodiment 2:

[0035] This embodiment provides a method for regulating a composite vacuum cleaner, which uses the composite vacuum cleaner control circuit described in Embodiment 1 to detect the state and current of the vacuum cleaner. Among them, the state detection of the vacuum cleaner includes: Step S1: After connecting the state detection circuit, power on the state detection circuit; Step S2: Measure the current at the floor brush current sampling terminal before use to obtain a first reference current value; Step S3: During use, continuously detect the current at the floor brush current sampling terminal in real time to obtain a real-time monitoring value; Step S4: Compare the real-time monitoring value with the first reference current value. When the real-time monitoring value < the first reference current value, the vacuum cleaner is in the handheld mode (the floor brush is not connected); otherwise, the vacuum cleaner is in the push rod mode (the floor brush is connected). The current detection of the vacuum cleaner includes: Step a: Collect the current at the third voltage dividing resistor R14 to obtain a second reference current value; Step b: Amplify and calculate the second reference current value, and judge its positive and negative. When the second reference current value is a negative current, the vacuum cleaner is in the charging state; when the second reference current value is a positive current, the vacuum cleaner is in the working state. Further, when the vacuum cleaner is in the charging state, the charging voltage is continuously monitored in real time, and a signal is fed back to adjust the working state of the charging circuit.

[0036] Embodiment 3:

[0037] This embodiment provides a composite vacuum cleaner, which includes the composite vacuum cleaner control circuit described in Embodiment 1.

[0038] In summary, for the composite vacuum cleaner control circuit, regulation method and composite vacuum cleaner of the present invention, by accurately detecting the change in the divided voltage value using the floor brush status detection circuit, the status of the floor brush can be judged in a timely and accurate manner. When the floor brush is inserted or removed, the divided voltage value at the floor brush current acquisition terminal will change significantly. The MCU can quickly capture these changes and make corresponding control decisions to protect the motor and circuit in a timely manner, effectively extending the service life of the device and reducing the maintenance cost. The current detection circuit of the present invention can monitor the charging voltage in real time and use it as a feedback signal to adjust the working state of the charging circuit. In this way, it can ensure that the voltage of the battery pack is always within a safe range during the charging process, avoid problems such as overcharging, improve the safety and reliability of the charging process, and extend the service life of the battery pack. To sum up, the composite vacuum cleaner circuit control system of the present invention has significant advantages in aspects such as switch control, floor brush status detection, circuit protection, current detection and charging management, can provide users with a more convenient, safe and reliable use experience, while reducing production costs, and has high market application value and promotion prospects.

[0039] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A composite vacuum cleaner control circuit, characterized in that: include: A floor brush state detection circuit, the state detection circuit is connected to the floor brush adapter, and includes a first MOS tube, a voltage dividing module, a voltage dividing diode and a floor brush access detection terminal, the voltage dividing diode is arranged between the first MOS tube and the voltage dividing module, the voltage dividing module includes a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor, wherein the first voltage dividing resistor and the second voltage dividing resistor are arranged in parallel, the third voltage dividing resistor is connected to the floor brush, the floor brush access detection terminal is arranged between the first voltage dividing resistor and the second voltage dividing resistor, the third voltage dividing resistor is arranged in series with the first voltage dividing resistor, and is arranged in parallel with the second voltage dividing resistor; A switch control circuit comprises a second diode, a third triode, a third MOS tube, a fourth triode and a control key, wherein the control key is connected to a battery, connected to an input end of the third triode, an output end of the third triode is connected to a source of the third MOS tube, a drain of the third MOS tube is connected to an input end of the second diode, an output end of the second diode is connected to the fourth triode, and the fourth triode is connected to a power supply to supply power to a step-down chip.

2. The composite vacuum cleaner control circuit according to claim 1, characterized in that: The ground brush state detection circuit also includes a second MOS tube and a second transistor Q9, the second MOS tube is connected to the first MOS tube and the second transistor Q9, and the second transistor Q9 is connected to the ground brush signal receiving port.

3. The composite vacuum cleaner control circuit according to claim 1, characterized in that: The ground brush state detection circuit also includes a freewheeling diode, and an output end of the freewheeling diode is connected to the first MOS tube.

4. The composite vacuum cleaner control circuit according to claim 1, characterized in that: The composite vacuum cleaner control circuit also includes a current detection circuit, which is connected to the floor brush adapter and includes a first diode, a first transistor and a charging MOS tube. The first transistor and the charging MOS tube are respectively connected to the cathode of the first diode. The charging MOS tube adjusts its on and off through the first transistor, and the battery pack is respectively connected to the charging MOS tube and the first MOS tube.

5. The composite vacuum cleaner control circuit according to claim 4, characterized in that: The switch control circuit also includes a buck chip and a sampling pin. The buck chip is connected to the power supply to drive the single-chip microcomputer, and the sampling pin is connected to the control key to collect the control key voltage.

6. The composite vacuum cleaner control circuit according to claim 1, characterized in that: The floor brush status detection circuit also includes a fuse, the floor brush adapter is connected to a terminal, the fuse is arranged between the first MOS tube and the floor brush adapter, and when the floor brush is in working state, the current passes through the battery pack, the first MOS tube, the fuse, the floor brush adapter input end, the terminal, the floor brush adapter output end, the third voltage divider resistor and then grounded.

7. The composite vacuum cleaner control circuit according to claim 1, characterized in that: The ground brush state detection circuit further includes a ground brush current sampling terminal, and the ground brush current sampling terminal is connected to the third voltage-dividing resistor and the current amplifier to calculate the ground brush current.

8. A method for controlling a composite vacuum cleaner, characterized in that: The composite vacuum cleaner control circuit according to any one of claims 1 to 7 is used to perform vacuum cleaner state detection and current detection, wherein the vacuum cleaner state detection includes: Step S1, after the state detection circuit is connected, power is supplied to the state detection circuit; Step S2, measuring the current at the ground brush current sampling end before use to obtain a first reference current value; Step S3, during use, real-time detection of the current at the ground brush current sampling end to obtain a real-time monitoring value; Step S4: comparing the real-time monitoring value with the first reference current value. When the real-time monitoring value is less than the first reference current value, the vacuum cleaner is in a handheld mode, otherwise the vacuum cleaner is in a push rod mode; The current detection of the vacuum cleaner includes: Step a, collecting the current at the third voltage-dividing resistor to obtain a second reference current value; Step b, amplifying and calculating the second reference current value, and determining whether it is positive or negative, When the second reference current value is a negative current, the vacuum cleaner is in a charging state; When the second reference current value is a positive current, the vacuum cleaner is in a working state.

9. The control method of a composite vacuum cleaner according to claim 8, characterized in that: When the vacuum cleaner is in a charging state, the charging voltage is monitored and detected in real time, and a feedback signal is used to adjust the working state of the charging circuit.

10. A composite vacuum cleaner, characterized in that: A composite vacuum cleaner control circuit comprising any one of claims 1 to 7.

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