Automatic identification method and system for brush head of dust collector

Abstract

The invention discloses an automatic identification method and system for a brush head of a dust collector, and the method comprises the steps: electrifying a brush head motor, starting timing, arranging a current time-delay circuit between the brush head motor and a power supply, enabling the current time-delay circuit to delay the generation of the current corresponding to the brush head motor, detecting the current of the brush head motor, recording the current detection time, and outputting the current detection time. And according to the recorded current detection time and a preset corresponding relationship between the current detection time and the brush head type, identifying the type of the currently assembled brush head. According to the automatic identification method and system for the brush head of the dust collector, the current delay circuit is arranged between the power source and the brush head motor, the type of the brush head is identified, then the current protection value of the motor is automatically set, additional signal lines do not need to be added between a host and the brush head motor, the wiring difficulty of the dust collector is reduced, and the wiring efficiency is improved. The overall cost of the dust collector is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum cleaners, and in particular to a method and system for automatically identifying a vacuum cleaner brush head. Background Art

[0002] Vacuum cleaners are generally equipped with a variety of brush heads to suit different usage environments, such as carpet brushes, floor brushes, and mite removal brushes. Regardless of the type of brush head, when encountering an abnormality such as hair entanglement that causes the motor to stall, certain protective measures are required to ensure the safety of the motor. The current common practice in the market is to determine the stall current. When the motor current exceeds a certain threshold, the motor will be immediately shut down. Because different brush heads use different motor power, the preset current value of the stall current is also different. Therefore, during use, the host needs to know which brush head is currently installed so that it can play a protective role according to the current protection value corresponding to this brush head.

[0003] Currently, the most common method for identifying brush heads is to configure corresponding signal lines for the brush heads. This method is very limited in its application in vacuum cleaners. This is because the line from the vacuum cleaner host to the brush head often only has two power lines. If a signal line is added, wiring will be difficult and the cost of the entire vacuum cleaner will increase. Summary of the Invention

[0004] In order to solve one or more of the above problems, the present application proposes a method and system for automatically identifying a vacuum cleaner brush head.

[0005] According to one aspect of the present application, a method for automatically identifying a vacuum cleaner brush head is provided, comprising: The brush head motor is powered on and timing begins. A current delay circuit is provided between the brush head motor and the power supply. The current delay circuit can delay the current corresponding to the brush head motor. Detect the current of the brush head motor and record the time when the current is detected. The type of the currently installed brush head is identified according to the recorded current detection time and the preset correspondence between the current detection time and the brush head type.

[0006] In some embodiments, detecting the current of the brush head motor and recording the time when the current is detected includes: Detect the current of the brush head motor, Determine whether the detected current of the brush head motor is greater than the preset current value, If the detected current of the brush head motor is greater than the preset current value, the time when the current is detected is recorded.

[0007] In some embodiments, when determining whether the detected current of the brush motor is greater than the preset current value, if the detected current of the brush motor is not greater than the preset current value, it is determined whether the currently recorded time is greater than the set timeout time, If the currently recorded time is less than the set timeout time, the current of the brush motor is continuously detected, If the currently recorded time is not less than the set timeout time, the timeout is detected, and it is determined that the brush head is not currently assembled.

[0008] According to another aspect of the present application, an automatic recognition system of a brush head of a dust collector is provided, which applies any one of the automatic recognition methods of a brush head of a dust collector provided above, comprising: a power supply for supplying power to the brush motor; a current delay circuit arranged between the power supply and the brush motor, for delaying the current corresponding to the brush motor, a current detection module for detecting the current of the brush motor; a timing module for recording the time of current detection, a recognition module for recognizing the type of the currently assembled brush head according to the recorded time of current detection and the preset corresponding relationship between the time of current detection and the type of the brush head; a current protection value setting module for setting the current protection value of the brush motor according to the type of the currently assembled brush head.

[0009] In some embodiments, it further comprises a current value judgment module for judging whether the detected current of the brush motor is greater than the preset current value.

[0010] In some embodiments, it further comprises a timeout judgment module for judging whether the current detection of the brush motor is timed out.

[0011] In some embodiments, the power supply, the current delay circuit, the current detection module, the timing module, the recognition module and the current protection setting module are all arranged in the main machine of the dust collector, and the current delay circuit is connected with the brush motor through the power line.

[0012] In some embodiments, the current delay circuit comprises a field effect transistor, a comparator, an RC charging circuit and a voltage dividing circuit, the voltage dividing circuit is connected to a power supply, the RC charging circuit is connected to an output of the voltage dividing circuit, an output of the voltage dividing circuit is connected to a REF terminal of the comparator through a resistor in the RC charging circuit, an ungrounded terminal of a capacitor in the RC charging circuit is connected to the REF terminal of the comparator, when a voltage of the ungrounded terminal of the capacitor in the RC charging circuit is greater than a reference voltage of the comparator, the comparator outputs a high level, an output of the comparator is connected to a gate of the field effect transistor, a source of the field effect transistor is connected to a positive pole of the power supply, a drain of the field effect transistor is connected to a negative pole of the power supply, when a voltage difference between the source and the gate of the field effect transistor is greater than a threshold voltage, the field effect transistor is turned on, and the current delay circuit is turned on.

[0013] In some embodiments, the current delay circuit further comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C6 and a capacitor C7, the capacitor C1 and the capacitor C2 are connected in parallel between positive and negative poles of the power supply, one end of the capacitor C3 is connected to the positive pole of the power supply through a resistor R1 and a diode D1 in sequence, so that the other end of the capacitor C3 is connected to the negative pole of the power supply, and the capacitor C6 and the capacitor C7 are connected in parallel between positive and negative poles of the brush head motor.

[0014] In some embodiments, a resistor R4 is connected between the gate and the source of the field effect transistor.

[0015] The application discloses an automatic identification method and system of a brush head of a dust collector. The current delay circuit is arranged between the power supply and the brush head motor. The brush head motor can delay the current. The time when the current is detected is recorded to identify the type of the brush head, and the automatic setting of the motor current protection value is realized. The additional signal line between the host and the brush head motor is not needed, and the type of the brush head is not needed to be selected manually. The automatic degree of the dust collector is improved, the wiring difficulty of the dust collector is reduced, and the overall cost of the dust collector is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A flow chart of the automatic identification method of the brush head of the dust collector is provided for an embodiment of the application.

[0017] Figure 2 A structure block diagram of the automatic identification system of the brush head of the dust collector is provided for an embodiment of the application.

[0018] Figure 3 A circuit diagram of the delay circuit in the automatic identification system of the brush head of the dust collector is provided for an embodiment of the application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "two ends", "both sides", "bottom", "top", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", "superior", "inferior", "primary", "secondary", etc. are used for descriptive purposes only and can be simply used to more clearly distinguish different components, but should not be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1: Reference Manual Figure 1 The embodiment of the present invention provides a method for automatically identifying a vacuum cleaner brush head, which may specifically include the following steps: S1: The brush head motor is powered on and timing begins. A current delay circuit is provided between the brush head motor and the power supply. The current delay circuit can delay the current corresponding to the brush head motor. S2: Detect the current of the brush head motor, S3: Determine whether the detected current of the brush head motor is greater than a preset current value. If so, execute S4; if not, execute S7; S4: record the time when the current is detected; S5: Identify the type of brush head currently installed based on the recorded current detection time and the preset correspondence between the current detection time and the brush head type; S6: Set the current protection value of the brush head motor according to the currently installed brush head type; S7: Determine whether the time of the current record is greater than the set timeout period. If so, execute S8. If not, return to execute S2. S8: The detection times out and it is determined that the brush head is not currently installed.

[0024] A current delay circuit is set between the brush head motor and the power supply. Since the current delay circuit can delay the generation of the corresponding current of the brush head motor, after the brush head motor is powered on, the time when the brush head motor equipped with different brush heads detects the appearance of the current is different. According to the time of current detection, the type of brush head currently installed can be judged, and then the current protection value of the brush head motor can be set.

[0025] For example, a vacuum cleaner is equipped with two brush heads, denoted as brush head A and brush head B. The current detection time of brush head A is denoted as T1, and the current detection time of brush head B is denoted as T2. Under the action of the current delay circuit, T2 and T1 are not equal. After the brush head motor is powered on, when the current detection time is T2, it corresponds to brush head B, and when the current detection time is T1, it corresponds to brush head A.

[0026] In S3, by judging whether the detected current of the brush head motor is greater than the preset current value, it is possible to effectively avoid mistaking the slight fluctuation of the current for the current after the delay circuit is turned on, thereby ensuring the accuracy of brush head recognition.

[0027] The present application discloses a method for automatically identifying the brush head of a vacuum cleaner. A current delay circuit is set between the power supply and the brush head motor. Since the current delay circuit can delay the generation of the current corresponding to the brush head motor, the time when the detected current occurs is recorded to identify the type of brush head, thereby realizing automatic setting of the motor current protection value. There is no need to add additional signal lines between the main unit and the brush head motor, and there is no need to manually select the brush head type, which improves the degree of automation of the vacuum cleaner, reduces the wiring difficulty of the vacuum cleaner, and reduces the overall cost of the vacuum cleaner.

[0028] Example 2: Reference Manual Figure 2 An embodiment of the present invention provides an automatic identification system for a vacuum cleaner brush head, and an automatic identification method for a vacuum cleaner brush head provided by any one of the above method embodiments may include: The power supply 11 is used to supply power to the brush head motor 13; the current delay circuit 12 is arranged between the power supply 11 and the brush head motor 13, and is used to delay the generation of the current corresponding to the brush head motor. The input end of the current delay circuit 12 is connected to the power supply 11, and the output end of the current delay circuit 12 is connected to the brush head motor 13 through the power line 20.

[0029] The current detection module 14 is used to detect the current of the brush head motor.

[0030] The timing module 15 is used to record the time when the current of the brush head motor is detected.

[0031] The current value judgment module 16 is used to judge whether the detected current of the brush head motor is greater than the preset current value. If it is greater than the preset current value, the timing module 15 records the time of current detection of the brush head motor. If it is not greater than the preset current value, the timeout judgment module 17 performs a timeout judgment.

[0032] The timeout judgment module 17 is used to judge whether the current detection of the current brush head motor has timed out. If it has timed out, it is determined that the brush head is not currently installed. If it has not timed out, the current detection module 14 continues to detect the current of the brush head motor.

[0033] The identification module 18 is used to identify the type of brush head currently installed based on the recorded current detection time and the preset correspondence between the current detection time and the brush head type. The current protection value setting module 19 is used to set the current protection value of the brush head motor according to the type of brush head currently installed.

[0034] In an optional embodiment, the power supply 11, the current delay circuit 12, the current detection module 14, the timing module 15, the current value judgment module 16, the timeout judgment module 17, the identification module 18 and the current protection value setting module 19 are all arranged in the main body of the vacuum cleaner, and the current delay circuit 12 is connected to the brush head motor 13 through the power cord 20. Therefore, only two power cords 20 need to be connected between the main body of the vacuum cleaner and the brush head motor 13, which has no impact on the overall structural design of the vacuum cleaner, reduces the difficulty of structural design, and reduces the cost of the entire machine.

[0035] In an optional embodiment, the current detection module 14, the timing module 15, the current value judgment module 16, the timeout judgment module 17, the identification module 18 and the current protection value setting module 19 can be integrated into a control chip. This control chip can be the original control unit of the vacuum cleaner, or it can be an additional single-chip microcomputer added to the control board of the vacuum cleaner. The single-chip microcomputer can be a common single-chip microcomputer that can realize current detection, timing, judgment and safety value setting.

[0036] Reference Manual Figure 3, shows a circuit diagram of a current delay circuit. The current delay circuit includes a field effect transistor Q1. When the voltage between the source and gate of the field effect transistor Q1 reaches a preset value, the current delay circuit is turned on.

[0037] Reference Manual Figure 3 As shown in , the connector J1 is used to connect the positive pole of the power supply 11, the connector J2 is used to connect the negative pole of the power supply 11, the connector J3 is used to connect the positive pole of the brush head motor 13, and the connector J4 is used to connect the negative pole of the brush head motor 13.

[0038] Capacitor C1 and capacitor C2 are connected in parallel between the positive and negative electrodes of the power supply 11. Thus, capacitors C1 and C2 are used for filtering, stabilizing the voltage of the power supply 11, reducing ripples, and ensuring that the current delay circuit 12 can operate stably.

[0039] Capacitor C6 and capacitor C7 are connected in parallel between the positive and negative poles of the brush head motor 13, and the negative pole of the power supply 11 and the negative pole of the brush head motor 13 are grounded. As a result, capacitor C6 can play a filtering and protective role. Capacitor C6 can filter out the high-frequency noise generated when the motor is working, reducing interference with other parts of the current delay circuit 12. At the same time, when the brush head motor 13 starts and stops, capacitor C6 can absorb transient voltage spikes to protect the brush head motor 13 and other components in the current delay circuit 12 from damage. Capacitor C7 can filter out high-frequency noise, further improve the anti-interference ability of the current delay circuit 12, and at the same time help stabilize the voltage of the brush head motor 13 when it is running, reduce high-frequency oscillations, and ensure the smooth operation of the brush head motor 13. Capacitor C6 and capacitor C7 cooperate with each other to form a multi-level filtering network. Capacitor C6 can filter out medium and high-frequency noise, and capacitor C7 can filter out noise in higher frequency bands, jointly improving the electromagnetic compatibility of the circuit.

[0040] The positive electrode of power supply 11 is connected to diode D1, resistor R1, and capacitor C3 in sequence, and then to ground. The positive electrode of diode D1 is connected to the positive electrode of power supply 11, and the negative electrode of diode D1 is connected to resistor R1. Diode D1 protects current delay circuit 12 from reverse voltage damage, while resistor R1 limits current and protects current delay circuit 12. Capacitor C3 is used for filtering, stabilizing the voltage of power supply 11, reducing ripple, and ensuring stable operation of current delay circuit 12.

[0041] One end of the resistor R4 is connected to the source of the field effect transistor Q1, and the other end is connected to the gate of the field effect transistor Q1. The resistor R4 serves as a bias resistor and can provide a stable bias voltage for the subsequent current delay circuit.

[0042] The resistor R2 and the resistor R3 are voltage dividing resistors, which can provide a comparison voltage for the comparator U1. The resistor R6 and the capacitor C5 form a charging circuit. When the voltage at the ungrounded end of the capacitor C5 is greater than the reference voltage of the comparator U1, the comparator U1 outputs a high level. The comparator U1 can be a chip of model CJ431. The REF end of the comparator U1 is connected to the connection point of the resistor R2 and the resistor R3 through the resistor R6. The REF end of the comparator U1 is connected to one end of the capacitor C5. The other end of the capacitor C5 is grounded. The cathode of the comparator U1 is connected to the gate of the field effect transistor Q1 through the resistor R7. The anode of the comparator U1 is grounded. When the comparator U1 outputs a high level, the voltage between the gate and the source of the field effect transistor Q1 meets the conduction condition of the field effect transistor Q1. The field effect transistor Q1 is turned on. The current delay circuit is turned on. The brush head motor 13 is connected to the power supply 11. The brush head motor 13 is started. The effect of delay start is achieved.

[0043] In optional embodiments, the delay time can be adjusted by adjusting the value of the capacitor C5. According to different delay times, the brush head type is identified.

[0044] The calculation formula of the delay time t is as follows: t=RC*ln((V1-V0) / (V1-Vth)), wherein R represents the resistance value of the resistor R6, C represents the value of the capacitor C5, V0 represents the voltage value of the capacitor C5 at the initial time, V1 represents the voltage value to which the capacitor C5 can be finally charged or discharged, Vth represents the voltage value on the capacitor C5 at the time t, and t represents the delay time.

[0045] Therefore, the delay function is realized by the charging circuit composed of the resistor R6 and the capacitor C5, the comparator U1 and the field effect transistor Q1. It is ensured that the brush head motor is started only after a certain delay time after the power supply is turned on. The brush head is effectively distinguished. The impact of the instantaneous start of the brush head motor on the circuit is avoided.

[0046] The application discloses an automatic identification system of a brush head of a dust collector. A current delay circuit is arranged between a power supply and a brush head motor. The current delay circuit can delay the current corresponding to the brush head motor. The time when the detected current appears is recorded. The brush head type is identified. The automatic setting of the motor current protection value is realized. No additional signal line needs to be added between the host and the brush head motor. No manual selection of the brush head type is needed. The automation degree of the dust collector is improved. The wiring difficulty of the dust collector is reduced. The overall cost of the dust collector is reduced.

[0047] The above only describes optional embodiments of the application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the application. These improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A method for automatically identifying a vacuum cleaner brush head, characterized in that: include: The brush head motor is powered on and timing begins. A current delay circuit is provided between the brush head motor and the power supply. The current delay circuit can delay the generation of the current corresponding to the brush head motor. Detect the current of the brush head motor and record the time when the current is detected. The type of the currently installed brush head is identified according to the recorded current detection time and the preset correspondence between the current detection time and the brush head type.

2. The automatic identification method for a vacuum cleaner brush head according to claim 1, characterized in that: The detecting the current of the brush head motor and recording the time of current detection includes: Detect the current of the brush head motor, Determine whether the detected current of the brush head motor is greater than the preset current value, If the detected current of the brush head motor is greater than the preset current value, the time when the current is detected is recorded.

3. The automatic identification method for a vacuum cleaner brush head according to claim 2, characterized in that: When judging whether the detected current of the brush head motor is greater than the preset current value, if the detected current of the brush head motor is not greater than the preset current value, then judging whether the current recorded time is greater than the set timeout time, If the current recorded time is less than the set timeout period, the current of the brush head motor will continue to be detected. If the current recorded time is not less than the set timeout period, the detection times out and it is determined that the brush head is not currently installed.

4. An automatic identification system for a vacuum cleaner brush head, applying the automatic identification method for a vacuum cleaner brush head according to any one of claims 1 to 3, characterized in that: include: A power supply for supplying power to the brush head motor; The current delay circuit is provided between the power supply and the brush head motor, and is used to delay the generation of the current corresponding to the brush head motor. Current detection module, used to detect the current of the brush head motor; Timing module, used to record the time of current detection, An identification module, configured to identify the type of brush head currently installed based on the recorded current detection time and a preset correspondence between the current detection time and the brush head type; The current delay circuit includes a field-effect transistor, a comparator, an RC charging circuit, and a voltage divider circuit. The voltage divider circuit is connected to a power supply, and the RC charging circuit is connected to the output end of the voltage divider circuit. The output end of the voltage divider circuit is connected to the REF end of the comparator via a resistor in the RC charging circuit. The ungrounded end of the capacitor in the RC charging circuit is connected to the REF end of the comparator. When the voltage at the ungrounded end of the capacitor in the RC charging circuit is greater than the reference voltage of the comparator, the comparator outputs a high level. The output end of the comparator is connected to the gate of the field-effect transistor, the source of the field-effect transistor is connected to the positive electrode of the power supply, and the drain of the field-effect transistor is connected to the negative electrode of the power supply. When the voltage difference between the source and gate of the field-effect transistor is greater than the threshold voltage, the field-effect transistor is turned on, and the current delay circuit is turned on.

5. The automatic identification system for a vacuum cleaner brush head according to claim 4, characterized in that: It also includes a current value judgment module for judging whether the detected current of the brush head motor is greater than a preset current value.

6. The automatic identification system for a vacuum cleaner brush head according to claim 5, characterized in that: It also includes a timeout judgment module for judging whether the current detection of the current brush head motor has timed out.

7. The automatic identification system for a vacuum cleaner brush head according to claim 4, characterized in that: The power supply, current delay circuit, current detection module, timing module, identification module and current protection setting module are all arranged in the main body of the vacuum cleaner, and the current delay circuit is connected to the brush head motor through a power line.

8. The automatic identification system for a vacuum cleaner brush head according to claim 4, characterized in that: The current delay circuit also includes capacitor C1, capacitor C2, capacitor C3, capacitor C6 and capacitor C7. The capacitor C1 and capacitor C2 are connected in parallel between the positive and negative poles of the power supply. One end of the capacitor C3 is connected to the positive pole of the power supply through resistor R1 and diode D1 in sequence, so the other end of the capacitor C3 is connected to the negative pole of the power supply. The capacitor C6 and capacitor C7 are connected in parallel between the positive and negative poles of the brush head motor.

9. The automatic identification system for a vacuum cleaner brush head according to claim 4, characterized in that: A resistor R4 is connected between the gate and source of the field effect tube.

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