Power tool and power tool system

Abstract

The application discloses an electric tool and an electric tool system. The electric tool comprises a motor, a control module configured to output a motor control signal to control a running state of the motor, a power supply interface comprising a first terminal and a second terminal configured to connect a power supply to the electric tool, a switch configured to connect the power supply to the motor, a first detection module electrically connected to the first terminal of the power supply interface and configured to generate a first electric signal after the power supply is connected, and a second detection module electrically connected to the first terminal of the power supply interface through the switch and configured to generate a second electric signal when the power supply is connected after the switch is turned on. The control module outputs the motor control signal according to a detection result of the first electric signal after detecting the second electric signal. The technical scheme of the application can avoid the safety hazard caused by the sudden start of the motor when the switch is turned on and the battery pack is inserted.

Description

Technical Field

[0001] This application relates to the field of tool and equipment technology, specifically to an electric tool and an electric tool system. Background Technology

[0002] Currently, handheld power tools, such as pruning machines, can suddenly start when connected to a power source or battery pack when the switch is closed, posing a safety hazard.

[0003] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0004] One object of this application is to solve or at least mitigate some or all of the aforementioned problems. Therefore, one object of this application is to provide a power tool and power tool system that increases the power-off protection function of the power tool to avoid safety hazards caused by sudden motor start-up.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides an electric tool, comprising:

[0007] Electric motor;

[0008] The control module is used to output motor control signals to control the motor's operating status;

[0009] A power interface, including a first terminal and a second terminal for connecting power to a power tool;

[0010] A switch is used to connect a power source to a motor;

[0011] The power tool also includes a first detection module electrically connected to a first terminal of the power interface for generating a first electrical signal after power is connected; and a second detection module electrically connected to the first terminal of the power interface via a switch for generating a second electrical signal when power is connected after the switch is closed.

[0012] After the control module detects the second electrical signal, it outputs a motor control signal based on the detection result of the first electrical signal.

[0013] In some embodiments, the first terminal is connected to the first end of the first detection module and connected to the first end of the second detection module via a switch; the second terminal is connected to the second end of the first detection module and the second end of the second detection module; the first detection module and the second detection module also have a third terminal for connecting to the control module and outputting a first electrical signal and a second electrical signal to the control module respectively.

[0014] In some embodiments, the first detection module includes a first charging unit and a first charging response unit; the first charging unit is electrically connected to a first terminal of a power interface and is used to generate a first voltage after power is connected; the first charging response unit is electrically connected to the first charging unit; after power is connected to the power interface, the first charging response unit outputs a first electrical signal in response to the first voltage generated by the first charging unit.

[0015] The second detection module includes a second charging unit and a second charging response unit. The second charging unit is electrically connected to the first terminal of the power interface via a switch, and is used to connect to the power supply and generate a second voltage after the switch is closed. The second charging response unit is electrically connected to the second charging unit. After the power supply is connected to the power interface, the second charging response unit responds to the second voltage generated by the second charging unit and outputs a second electrical signal.

[0016] In some embodiments, the first charging response unit includes a first voltage regulator branch, which is electrically connected to the first charging unit and the second terminal; the first voltage regulator branch is used to conduct in reverse under the action of the first voltage generated by the first charging unit, so as to stabilize the voltage generated by the first charging unit to a voltage range that the control module can accept.

[0017] The second charging response unit includes a second voltage regulation branch, which is electrically connected to the second charging unit and the second terminal. The second voltage regulation branch is used to conduct in reverse under the action of the voltage generated by the second charging unit, so as to stabilize the voltage generated by the second charging unit to a voltage range that the control module can accept.

[0018] In some embodiments, the first voltage-regulating branch includes a first current-limiting resistor and a first Zener diode; one end of the first current-limiting resistor is electrically connected to the first charging unit, and the other end is electrically connected to the cathode of the first Zener diode; the anode of the first Zener diode is electrically connected to the second terminal.

[0019] The second voltage-regulating branch includes a second current-limiting resistor and a second Zener diode; one end of the second current-limiting resistor is electrically connected to the second charging unit, and the other end is electrically connected to the cathode of the second Zener diode; the anode of the second Zener diode is electrically connected to the second terminal.

[0020] In some embodiments, the first charging response unit further includes a first discharge branch; the first discharge branch is electrically connected to the first charging unit and the second terminal respectively; the first discharge branch is used to release the charge stored in the first charging unit;

[0021] The second charging response unit also includes a second discharge branch; the second discharge branch is electrically connected to the second charging unit and the second terminal respectively; the second discharge branch is used to release the charge stored in the second charging unit.

[0022] In some embodiments, the first charging unit includes at least one first capacitor, wherein the first capacitors are connected in parallel and have the same capacity.

[0023] The second charging unit includes at least one second capacitor, and the second capacitors are connected in parallel with each other and have the same capacity.

[0024] In some embodiments, the first electrical signal is a voltage signal or a current signal, and / or the second electrical signal is a voltage signal or a current signal.

[0025] In some embodiments, the parameters of each component in the first detection module and the second detection module are the same.

[0026] In some embodiments, the control module is configured to:

[0027] When the second electrical signal is detected and the first electrical signal is not detected within the first time interval, a motor operation signal is output so that the motor operates according to the target working mode.

[0028] In some embodiments, the control module is configured to:

[0029] When a second electrical signal is detected, and a first electrical signal is detected within a first time interval, the power supply connection time of the first detection module is determined based on the signal parameters of the first electrical signal.

[0030] If the power supply time is longer than the second time interval, a motor operation signal will be output to make the motor operate in the target working mode.

[0031] In some embodiments, the control module is configured to:

[0032] The power supply connection time of the first detection module is determined based on the signal parameters of the first electrical signal and the signal parameters of the second electrical signal.

[0033] In some embodiments, the control module is configured to:

[0034] If the power supply time is less than or equal to the second time interval, a safety mode control signal is generated. The safety mode control signal is used to control the motor to be in a stopped state or a low-speed running state.

[0035] In some embodiments, the safety mode control signal is eliminated after the control module is powered off.

[0036] Secondly, this application provides an electric tool, comprising:

[0037] Electric motor;

[0038] The control module is used to output motor control signals to control the motor's operating status;

[0039] A power interface, including a first terminal and a second terminal for connecting power to a power tool;

[0040] A switch is used to connect a power source to a motor;

[0041] The control module is configured as follows:

[0042] Detect the electrical signals at the first detection point and the second detection point; wherein, the first detection point is the location where an electrical signal is generated when the power supply is connected to the power interface, and the second detection point is the location where an electrical signal is generated when the power supply is connected to the power interface and the switch is closed;

[0043] When an electrical signal is detected at the second detection point, the first real-time signal at the first detection point is acquired.

[0044] Based on the matching of the parameters of the first real-time signal with the pre-stored parameters of the first signal, a motor control signal is output.

[0045] In some embodiments, the first signal parameter is the signal parameter of the electrical signal generated at the first detection point when the power supply is connected to the power interface.

[0046] In some embodiments, the control module is specifically configured to output a motor operation signal when the difference between the amplitude of the first real-time signal and the amplitude of the first signal parameter is greater than a first preset value, so that the motor operates according to the target working mode.

[0047] In some embodiments, the control module is configured to adjust the first signal parameter based on the electrical signal at the second detection point.

[0048] In some embodiments, the duration of acquiring the first real-time signal is less than the security response delay time.

[0049] In some embodiments, the control module is configured to: acquire a second real-time signal at a second detection point; if the parameters of the second real-time signal match the pre-stored parameters of the second signal, then determine that an electrical signal at the second detection point has been detected.

[0050] In some embodiments, the second signal parameter is the signal parameter of the electrical signal generated at the second detection point when the power supply is connected to the power interface and the switch is closed.

[0051] In some embodiments, the control module is configured to: determine whether the amplitude and / or phase difference between the second real-time signal and the second signal parameter is less than a second preset value, and then match.

[0052] In some embodiments, the signal waveform corresponding to the first signal parameter is the same as the signal waveform corresponding to the second signal parameter.

[0053] Thirdly, this application provides an electric tool system, comprising:

[0054] Power tools, including motors;

[0055] Power supply, used to connect to power tools and power the motor;

[0056] Power tools also include switches for connecting the power output to the motor;

[0057] The control module is used to perform preset processes to adjust the operating state of the motor;

[0058] The control module includes a first detection unit electrically connected to the output terminal of the power supply, used to generate a first electrical signal after the power supply is connected; and a second detection unit electrically connected to the output terminal of the power supply via a switch, used to generate a second electrical signal when the power supply is connected after the switch is closed.

[0059] The control module also includes a controller, which, upon detecting the second electrical signal, performs preset processing based on the detection result of the first electrical signal to put the motor into a safe mode.

[0060] In some embodiments, the preset processing includes: controlling the power supply to stop supplying power, controlling the switch to open, and / or outputting a safety mode control signal.

[0061] The advantages of this application are as follows: The power tool includes a motor, a control module, a power interface, and a switch. The control module outputs motor control signals to control the motor's operating state. The power interface includes a first terminal and a second terminal for connecting power to the power tool. The power interface connects power to the motor via a switch. The power tool also includes a first detection module and a second detection module. The first detection module is electrically connected to the first terminal of the power interface and generates a first electrical signal after power is connected. The second detection module is electrically connected to the first terminal of the power interface via a switch and connects power after the switch is closed, generating a second electrical signal. When the control module detects the second electrical signal, it outputs a motor control signal based on the detection result of the first electrical signal. Thus, based on the first and second electrical signals, it can determine whether the power tool triggers the switch before inserting the battery pack or inserts the battery pack before triggering the switch. This allows for power-on protection when the switch is triggered before the battery pack is inserted, and for normal motor startup when the battery pack is inserted before the switch is triggered, thereby avoiding safety hazards caused by accidental startup of the power tool when the battery pack is inserted. Attached Figure Description

[0062] Figure 1 A perspective view of the pruning machine provided in the embodiments of this application;

[0063] Figure 2 A circuit structure block diagram of a power tool provided in an embodiment of this application;

[0064] Figure 3 Equivalent circuit diagram of the power tool provided in the embodiments of this application;

[0065] Figure 4 A comparison diagram of the degradation waveform of the first charging module under different states of the battery provided in the embodiments of this application;

[0066] Figure 5 A circuit structure block diagram of another power tool provided in the embodiments of this application;

[0067] Figure 6 This is a structural block diagram of an electric tool system provided in an embodiment of this application. Detailed Implementation

[0068] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0069] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0070] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0071] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0072] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0073] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0074] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0075] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. When using the unit "controller," "processor," "central processing unit," "CPU," or "MCU" to perform a specific function, unless otherwise stated, these functions may be performed by a single or multiple of the aforementioned units.

[0076] In this application, the terms "device," "module," or "unit" are used to describe devices that can be implemented in hardware or software to perform a specific function.

[0077] In this application, the terms “calculation,” “judgment,” “control,” “determine,” “identify,” etc., refer to the operation and process of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0078] Figure 1 This is a perspective view of the pruning machine provided in the embodiments of this application, with reference to... Figure 1 As shown, the power tool provided in this application can be a pruning machine. In this embodiment, the power tool is specifically taken as a pruning machine, but this does not limit the type of power tool provided in this embodiment. All power tools that can adopt the technical solution provided in this embodiment are included within the protection scope of this embodiment, and will not be described in detail below.

[0079] Pruning machines can be handheld by users for pruning and shaping plants. Figure 2 This is a circuit structure block diagram of the power tool provided in the embodiments of this application. Figure 3 Equivalent circuit diagram of the power tool provided in the embodiments of this application. (Referring to reference...) Figures 1 to 3 As shown, the pruning machine 100 provided in this embodiment includes: a hand grip 1, a power interface 2, a switch 3, a motor 4, a chain cutter 5, and a control module 6. The hand grip 1 is for the user to hold, allowing the user to control the pruning range of the pruning machine 100. The power interface 2 includes a first terminal 21 and a second terminal 22, for connecting a power source 7 to the pruning machine 100. The power source 7 may include, but is not limited to, an external AC power source or a DC power source. In an exemplary embodiment, the power source 7 is a rechargeable battery pack. The power interface 2 connects the power source 7 to the motor 4 via the switch 3, causing the motor 4 to operate. The motor 4 drives the chain cutter 5 to rotate, allowing the user to prune plants using the pruning machine 100. The control module 6 outputs motor control signals to control the operating state of the motor 4.

[0080] The pruning machine 100 also includes a first detection module 8 and a second detection module 9. The power supply 7 is connected to the first terminal 21 and the second terminal 22 of the power interface 2, respectively. The first detection module 8 is electrically connected to the first terminal 21, and the second detection module 9 is connected to the first terminal 21 via a switch. The first detection module 8 generates a first electrical signal after the power supply 7 is connected, and the second detection module 9 generates a second electrical signal when the power supply 7 is connected after the switch 3 is closed. The first detection module 8 and the second detection module 9 are also connected to the control module 6, so that the first detection module 8 can send the first electrical signal and the second detection module 9 can send the second electrical signal to the control module 6. Therefore, after detecting the second electrical signal, the control module 6 can output a motor control signal based on the detection result of the first electrical signal to control the operation of the motor 4.

[0081] The power access point of the first detection module 8 is located between the first terminal 21 and the switch 3, and the power access point of the second detection module 9 is located between the switch 3 and the motor. Thus, after the power is connected, the first detection module 8 can generate a first electrical signal regardless of whether the switch 3 is closed, while the second detection module 9 generates a second electrical signal only when the switch 3 is closed and the power is connected.

[0082] In one alternative embodiment, the first electrical signal is a voltage signal or a current signal, and / or the second electrical signal is a voltage signal or a current signal.

[0083] It should be noted that the first electrical signal and the second electrical signal can be of the same type or different. This embodiment does not impose specific limitations on this, as long as the core inventive point of this embodiment can be achieved.

[0084] The detection result of the first electrical signal may include, but is not limited to, whether the first electrical signal was detected, or the order in which the first and second electrical signals were detected. Motor control signals include, but are not limited to, motor operation signals that cause motor 4 to operate according to the target operating mode, signals that prevent motor 4 from starting, and / or safety mode control signals that cause motor 4 to operate at low speed. The target operating mode is a user-defined operating mode, such as causing motor 4 to operate at a specific torque or speed.

[0085] In an optional embodiment, after detecting the second electrical signal, the control module 6 outputs a motor control signal based on the detection result of the first electrical signal. This includes: after detecting the second electrical signal, the control module 6 compares the time difference between acquiring the first electrical signal and the time difference between the second electrical signal. When the time difference between acquiring the first electrical signal and the second electrical signal is greater than or equal to a set time, it indicates that the power tool's power insertion time precedes the switch 3's closing time. At this time, the control module 6 outputs a motor operation signal that causes the motor 4 to operate according to the target working mode. Conversely, when the time difference between acquiring the first electrical signal and the second electrical signal is less than the set time, it indicates that the power tool's switch 3's closing time precedes the power insertion time. At this time, the control module 6 outputs a safety mode control signal that prohibits the motor 4 from starting or causes the motor 4 to operate at low speed, in order to avoid safety hazards caused by the sudden start of the power tool. The set time is set according to the parameters of each component in the first detection module 8 and the second detection module 9.

[0086] In this embodiment, the power tool includes a motor, a control module, a power interface, and a switch. The control module outputs motor control signals to control the motor's operating state. The power interface includes a first terminal and a second terminal for connecting power to the power tool. The power interface connects power to the motor via the switch. The power tool also includes a first detection module and a second detection module. The first detection module is electrically connected to the first terminal of the power interface and generates a first electrical signal after power is connected. The second detection module is electrically connected to the first terminal of the power interface via the switch and connects power after the switch is closed, generating a second electrical signal. When the control module detects the second electrical signal, it outputs a motor control signal based on the detection result of the first electrical signal. Thus, based on the first and second electrical signals, it can determine whether the power tool triggers the switch before inserting the battery pack or inserts the battery pack before triggering the switch. This allows for power-on protection when the switch is triggered before the battery pack is inserted, and for normal motor startup when the battery pack is inserted first, thus avoiding safety hazards caused by accidental startup of the power tool when the battery pack is inserted.

[0087] Optional, see reference Figure 2 and Figure 3 As shown, the first terminal 21 is connected to the first end of the first detection module 8 and is connected to the first end of the second detection module 9 through the switch 3. The second terminal 22 is connected to the second end of the first detection module 8 and the second end of the second detection module 9. The first detection module 8 and the second detection module 9 also have a third terminal for connecting to the control module 6 and outputting a first electrical signal and a second electrical signal to the control module 6 respectively, so that the power supply can supply power to the first detection module 8 and the second detection module 9, so that the first detection module 8 can generate a first electrical signal and the second detection module 9 can generate a second electrical signal, and output the first electrical signal and the second electrical signal to the control module 6 respectively, so that the control module 6 can output a motor control signal according to the first electrical signal and the second electrical signal.

[0088] Optional, see reference Figure 2 As shown, the first detection module 8 includes a first charging unit 81 and a first charging response unit 82. The first charging unit 81 is electrically connected to the first terminal 21 of the power interface 2 and is used to generate a first voltage after the power supply 7 is connected. The first charging response unit 82 is electrically connected to the first charging unit 81, and after the power supply 7 is connected to the power interface 2, the first charging response unit 82 outputs a first electrical signal in response to the first voltage generated by the first charging unit 81.

[0089] Specifically, after the power supply 7 is connected, the first charging unit 81 is electrically connected to the power supply 7 through the power interface 2, thereby the first charging unit 81 senses the voltage of the power supply 7 and generates a first voltage. Since the first charging response unit 82 is electrically connected to the first charging unit 81, the first charging response unit 82 can respond to the first voltage generated by the first charging unit 81 and output a first electrical signal.

[0090] In an optional embodiment, the first charging unit 81 includes at least one first capacitor C1, all of which are connected in parallel and have the same capacity, thereby generating a first voltage after a power source is connected.

[0091] The first charging unit 81 includes at least one first capacitor C1, which can be understood as the first charging unit 81 including one or more first capacitors C1. When the first charging unit 81 includes multiple first capacitors C1, the capacitance of each first capacitor C1 is the same, thereby making the first voltage generated by the first charging unit 81 stable.

[0092] It should be noted that, Figure 2 This example only illustrates the case where the first charging unit 81 includes a first capacitor C1, and does not limit the number of first capacitors C1, as long as the core inventive point of this embodiment can be achieved.

[0093] Optional, continue to refer to Figure 2 As shown, the first charging response unit 82 includes a first voltage regulator branch, which is electrically connected to the first charging unit 81 and the second terminal 22. The first voltage regulator branch is used to conduct in reverse under the action of the first voltage generated by the first charging unit 81, so as to stabilize the voltage generated by the first charging unit 81 to a voltage range that the control module 6 can accept.

[0094] Specifically, after the power supply 7 is connected, the first charging unit 81 senses the voltage of the power supply 7 and generates a first voltage. The first voltage regulator branch conducts in reverse under the action of the first voltage generated by the first charging unit 81, thereby stabilizing the voltage generated by the first charging unit 81 to the voltage range that the control module 6 can accept.

[0095] In an optional embodiment, the first voltage-regulating branch includes a first current-limiting resistor R5 and a first Zener diode D1. One end of the first current-limiting resistor R5 is electrically connected to the first charging unit 81, and the other end is electrically connected to the cathode of the first Zener diode D1. The anode of the first Zener diode D1 is electrically connected to the second terminal 22, so that the first voltage-regulating branch can conduct in reverse under the action of the first voltage, stabilizing the voltage generated by the first charging unit 81 to a voltage range that the control module 6 can accept.

[0096] In an optional embodiment, the first charging response unit 82 further includes a first discharge branch. The first discharge branch is electrically connected to the first charging unit 81 and the second terminal 22, respectively. The first discharge branch is used to release the charge stored in the first charging unit 81.

[0097] In an alternative embodiment, the first discharge branch includes a first discharge resistor R2.

[0098] Specifically, after the power supply 7 is connected, the power supply 7 charges the first charging unit 81 to generate a first voltage. To ensure that the first charging unit 81 still has a voltage change when the power supply 7 is disconnected and then reconnected, the charge stored in the first charging unit 81 needs to be released after the power supply is disconnected. Therefore, a first discharge branch is provided between the first charging unit 81 and the second terminal 22, so that the first discharge branch can release the charge stored in the first charging unit 81 after the power supply is disconnected.

[0099] The second detection module 9 includes a second charging unit 91 and a second charging response unit 92. The second charging unit 91 is electrically connected to the first terminal 21 of the power interface 2 via a switch 3, and is used to connect to the power supply 7 and generate a second voltage after the switch 3 is closed. The second charging response unit 92 is electrically connected to the second charging unit 91, and after the power supply 7 is connected to the power interface 2, the second charging response unit 92 outputs a second electrical signal in response to the second voltage generated by the second charging unit 91.

[0100] Specifically, after the power supply 7 is connected, the second charging unit 91 is electrically connected to the power supply 7 through the power interface 2, thereby the second charging unit 91 senses the voltage of the power supply 7 and generates a second voltage. Since the second charging response unit 92 is electrically connected to the second charging unit 91, the second charging response unit 92 can respond to the second voltage generated by the second charging unit 91 and output a second electrical signal.

[0101] In an optional embodiment, the second charging unit 91 includes at least one second capacitor C2, and the second capacitors C2 are connected in parallel with each other and have the same capacity.

[0102] The second charging unit 91 includes at least one second capacitor C2, which can be understood as the second charging unit 91 including one or more second capacitors C2. When the second charging unit 91 includes multiple second capacitors C2, the capacitance of each second capacitor C2 is the same, thereby making the second voltage generated by the second charging unit 91 stable.

[0103] It should be noted that, Figure 2 This illustration only demonstrates the case where the second charging unit 91 includes a second capacitor C2, and does not limit the number of second capacitors C2, as long as the core inventive point of this embodiment can be achieved.

[0104] In an optional embodiment, the second charging response unit 92 includes a second voltage-regulating branch, which is electrically connected to the second charging unit 91 and the second terminal 22. The second voltage-regulating branch is used to conduct in reverse under the action of the voltage generated by the second charging unit 91, so as to stabilize the voltage generated by the second charging unit 91 to a voltage range acceptable to the control module 6.

[0105] Specifically, after the power supply 7 is connected, the second charging unit 91 senses the voltage of the power supply 7 and generates a second voltage. The second voltage regulator branch conducts in reverse under the action of the second voltage generated by the second charging unit 91, thereby stabilizing the voltage generated by the second charging unit 91 to the voltage range that the control module 6 can accept.

[0106] In an optional embodiment, the second voltage-regulating branch includes a second current-limiting resistor R3 and a second Zener diode D2; one end of the second current-limiting resistor R3 is electrically connected to the second charging unit 91, and the other end is electrically connected to the cathode of the second Zener diode D2; the anode of the second Zener diode D2 is electrically connected to the second terminal 22, so that the second voltage-regulating branch can conduct in reverse under the action of the second voltage, and stabilize the voltage generated by the second charging unit 91 to the voltage range that the control module 6 can accept.

[0107] In an optional embodiment, the second charging response unit 92 further includes a second discharge branch; the second discharge branch is electrically connected to the second charging unit 91 and the second terminal 22 respectively; the second discharge branch is used to release the charge stored in the second charging unit 91.

[0108] In an alternative embodiment, the second discharge branch includes a second discharge resistor R4.

[0109] Specifically, after power supply 7 is connected and switch 3 is triggered, power supply 7 charges the second charging unit 91 to generate a second voltage. To ensure that the second charging unit 91 still exhibits voltage changes when power supply 7 is disconnected and then connected again, or when switch 3 is disconnected and then triggered again, the charge stored in the second charging unit 91 needs to be released after power supply 7 is disconnected or switch 3 is disconnected. Therefore, a second discharge branch is provided between the second charging unit 91 and the second terminal 22, allowing the second discharge branch to release the charge stored in the second charging unit 91 after power supply 7 is disconnected or switch 3 is disconnected.

[0110] Optionally, the parameters of each component in the first detection module 8 and the second detection module 9 are the same, so that the charging time of the first charging unit 81 and the second charging unit 91, as well as the first voltage generated by the first charging unit 81 and the second voltage generated by the second charging unit 91 are the same, thereby making the decay waveforms of the first charging unit 81 and the second charging unit 91 consistent. This is beneficial to improving the accuracy of the motor control signal output by the control module 6, and further avoiding safety hazards caused by sudden start of power tools.

[0111] In an optional embodiment, after the control module 6 detects the second electrical signal, it outputs a motor control signal based on the detection result of the first electrical signal, including: when the second electrical signal is detected and the first electrical signal is not detected within the first time interval, it outputs a motor operation signal so that the motor 4 operates according to the target working mode.

[0112] The first time interval is set based on the objectively possible signal delay time in the circuit. In an optional embodiment, the first time interval is greater than or equal to the objectively possible signal delay time in the circuit, so as to ensure that the first electrical signal can be detected when power is connected.

[0113] It is understandable that when power is connected, the first detection module outputs a first electrical signal, so the moment the control module receives the first electrical signal can be considered the moment power is connected. Conversely, when power is connected and the switch is closed, the second detection module outputs a second electrical signal, so the moment the control module receives the second electrical signal can be considered the moment the switch is closed. Therefore, if the first electrical signal is detected within a very short time (i.e., the first time interval) of detecting the second electrical signal, it can be determined that the moment power is connected is equal to or approximately equal to the moment the switch is closed. This suggests a high probability that the switch was already closed before power was connected, thus requiring the motor to be controlled in a safe mode. Conversely, if the first electrical signal is not detected within a very short time (i.e., the first time interval), it can be determined that the moment power is connected is much earlier than the moment the switch is closed, and the power tool is likely to start normally. Therefore, a motor operation signal can be output to make the motor operate according to the target working mode.

[0114] It is worth mentioning that, such as Figure 3 In the illustrated embodiment, the control module is also connected to the power supply via a switch. Therefore, the control module only powers on and begins to work after the power is connected and the switch is closed, meaning that the first and second electrical signals can be detected at this time. When the power supply or the switch is disconnected, the control module loses power and enters a shutdown state.

[0115] When the second electrical signal is detected, and the first electrical signal is detected within the first time interval, the power supply time of the first detection module 8 is determined according to the signal parameters of the first electrical signal; if the power supply time is longer than the second time interval, a motor operation signal is output so that the motor 4 operates according to the target working mode.

[0116] The power connection time can be understood as the total time of power connection. In this embodiment, the power connection time can also be understood as the length of time the first electrical signal is detected. Specifically, determining the power connection time of the first detection module 8 based on the signal parameters of the first electrical signal can be done by determining the power connection time of the first detection module 8 based on the decay waveform of the first electrical signal.

[0117] Furthermore, when the first and second electrical signals are time-varying signals, for example... Figure 3 In the circuit shown, based on the electrical characteristics of capacitors, when power is connected, C1 conducts and enters a charging state, and the control module can detect the first electrical signal. As time goes by, C1 stores electrical energy, and the voltage drop gradually increases, causing the first electrical signal to gradually decay until the voltage of C1 stabilizes and disconnects. Similarly, when power is connected and the switch is closed, C2 conducts and enters a charging state, and the control module can detect the second electrical signal. As time goes by, C2 stores electrical energy, and the voltage drop gradually increases, causing the second electrical signal to gradually decay until the voltage of C2 stabilizes and disconnects. Therefore, the decay time of the first electrical signal can be determined from the signal parameters of the first electrical signal and the decay law of the above-mentioned electrical signal, thereby roughly deducing the power connection time of the first detection module, that is, the time when power is connected to the power tool.

[0118] The second time interval setting mainly considers the user's operation time. That is, the second time interval can be greater than or equal to the time the user takes to operate switch 3 after connecting the power supply to make switch 3 open or trigger. Specifically, it can be the normal time or the fastest time for the user to perform the operation.

[0119] Specifically, when the second electrical signal is detected but the first electrical signal is not detected within the first time interval, it indicates that the first charging unit 81 is already in the charging completed state when the second electrical signal is detected. Therefore, the first charging unit 81 no longer generates the first voltage, which indicates that the power supply 7 of the power tool is inserted before the closing time of the switch 3. Thus, there is no need to start the power tool. At this time, the control module 6 outputs a motor operation signal to make the motor 4 operate in the target working mode so that the power tool can operate normally.

[0120] Conversely, when the second electrical signal is detected and the first electrical signal is detected within the first time interval, it indicates that the second and first electrical signals are triggered simultaneously. In this case, it can be determined that the closing time of the power tool's switch 3 precedes the insertion time of the power supply 7. Furthermore, when the power supply connection time is greater than the second time interval, it indicates that the user has sufficient time to operate the switch 3 after connecting the power supply 7. Therefore, it is possible that the user manually closes the switch after connecting the power supply, thus eliminating the need for start-up protection of the power tool. In this case, the control module 6 outputs a motor operation signal to make the motor 4 operate in the target working mode, ensuring normal operation of the power tool. However, when the power supply connection time is less than or equal to the second time interval, since the closing time of the power tool's switch 3 precedes the insertion time of the power supply 7, and the user does not have sufficient time to operate the switch 3 after connecting the power supply 7, start-up protection of the power tool is required. In this case, the control module 6 outputs a safety mode control signal to prohibit the motor 4 from starting or to make the motor 4 operate at low speed, to avoid safety hazards caused by the sudden start of the motor 4.

[0121] When the connected power source 7 is a battery pack, the decay waveform of the first electrical signal will change due to reasons such as battery undervoltage. Figure 4 This is a comparison diagram of the degradation waveforms of the first charging module under different states of the battery provided in the embodiments of this application, with reference to... Figure 4 It can be seen that when the battery is not undervoltage, the time it takes for the voltage of the first charging module to drop from 40V to 1V is 314ms, while when the battery is undervoltage, the time it takes for the voltage of the first charging module to drop from 33V to 1V is 359ms.

[0122] Therefore, in an optional embodiment, the power supply connection time of the first detection module 8 can be determined based on the signal parameters of the first electrical signal and the second electrical signal, thereby enabling accurate determination of the power supply connection time of the first detection module 8 even when the battery is undervoltage. It is easy to understand that when a situation similar to battery undervoltage occurs, not only will the signal parameters of the first electrical signal change, but the signal parameters of the second electrical signal will also change accordingly. Since the second electrical signal is detected when it is in its initial generation stage and has not yet changed significantly over time, the signal parameters of the second electrical signal at this moment can accurately reflect whether there is an undervoltage situation. Furthermore, the waveform of the first electrical signal can be adjusted by referring to the signal parameters of the second electrical signal, so that the decay time corresponding to the first electrical signal can be more accurately determined through the adjusted waveform.

[0123] If the power supply time is less than or equal to the second time interval, a safety mode control signal is generated to control the motor 4 to be in a stopped state or a low-speed running state.

[0124] In an optional embodiment, after the control module 6 is powered off, that is, after the power supply is disconnected, the safety mode control signal is eliminated, so that the safety start function of the power tool remains effective when the power is connected again.

[0125] Based on the same concept, this application also provides another power tool. Figure 5 A circuit structure block diagram of another power tool provided in an embodiment of this application is shown below. Figure 5 As shown, the control module 6 of the power tool is configured to: detect electrical signals at a first detection point and a second detection point; when an electrical signal at the second detection point is detected, acquire a first real-time signal at the first detection point; and output a motor control signal based on the matching of the parameters of the first real-time signal with the pre-stored first signal parameters.

[0126] The first detection point is the location where an electrical signal is generated when the power supply is connected to the power interface 2. For example, the first detection point can be a point on the line between the power interface 2 and the switch 3. The second detection point is the location where an electrical signal is generated when the power supply is connected to the power interface 2 and the switch 3 is closed. For example, the second detection point can be a point on the line between the switch 3 and the motor 4.

[0127] The parameters of the first real-time signal are the signal parameters of the electrical signal at the first detection point, such as amplitude, which are acquired in real time. In an optional embodiment, the first signal parameter is the signal parameter of the electrical signal that the first detection point should generate when the power supply is connected to the power interface 2. It is understood that when the connected power supply is a battery pack, the waveform of the first electrical signal will change due to reasons such as battery undervoltage. Therefore, in an optional embodiment, the first signal parameter can be adjusted according to the electrical signal at the second detection point to correct the first signal parameter, thereby improving the accuracy of the motor control signal output by the control module 6. Specifically, the first signal parameters corresponding to different power supply voltages can also be pre-stored. For example, if the standard power supply voltage is 56V, the first signal parameters corresponding to 56V, 55.5V, 55V, etc. can be stored. When the electrical signal at the second detection point is detected, the current power supply voltage can be determined based on the electrical signal, thereby determining the specific first signal parameter.

[0128] Optionally, the duration of acquiring the first real-time signal is less than the security response delay time.

[0129] The safety response time can be understood as the time required for motor 4 to start, that is, the maximum time required for motor 4 to start running after being powered on.

[0130] Since the motor control signal needs to be output based on the matching between the parameters of the first real-time signal and the parameters of the first signal, the longer the acquisition time of the first real-time signal, the more accurate the matching between the parameters of the first real-time signal and the first signal, and the more accurate the final output motor control signal. However, if the acquisition time of the first real-time signal is too long, the motor control signal may be output only after the motor 4 has already started, thus causing the safety start function of the power tool to fail. Therefore, by making the duration of acquiring the first real-time signal shorter than the safety response delay time, the motor control signal is output before the motor 4 starts, thereby ensuring that the motor 4 can operate according to the motor control signal output by the control module 6, and realizing the safety start function of the power tool.

[0131] The matching status of the parameters of the first real-time signal with the pre-stored first signal parameters includes: when the difference between the amplitude of the first real-time signal and the amplitude of the first signal parameter is less than or equal to a first preset value, it is determined that the parameters of the first real-time signal match the pre-stored first signal parameters. Conversely, when the difference between the amplitude of the first real-time signal and the amplitude of the first signal parameter is greater than the first preset value, it is determined that the parameters of the first real-time signal do not match the pre-stored first signal parameters.

[0132] Motor control signals may include, but are not limited to, motor operation signals that enable motor 4 to operate in the target working mode, signals that prevent motor 4 from starting, and / or safety mode control signals that enable motor 4 to operate at low speed.

[0133] In some embodiments, the motor control signal output based on the matching of the parameters of the first real-time signal with the pre-stored first signal parameters includes: when the parameters of the first real-time signal match the pre-stored first signal parameters, it indicates that the electrical signals at the first detection point and the second detection point are detected simultaneously, indicating that the closing time of the power tool switch 3 precedes the insertion time of the power supply 7, thus requiring start-up protection for the power tool. In this case, the control module 6 outputs a safety mode control signal that prohibits the motor 4 from starting or makes the motor 4 run at low speed to avoid safety hazards caused by the sudden start of the motor 4. Conversely, when the parameters of the first real-time signal do not match the pre-stored first signal parameters, it indicates that the control module 6 detects the electrical signal at the first detection point before the electrical signal at the second detection point, indicating that the insertion time of the power supply 7 of the power tool precedes the closing time of the switch 3, thus requiring no start-up protection for the power tool. In this case, the control module 6 outputs a motor operation signal that makes the motor 4 operate in the target working mode to ensure normal operation of the power tool.

[0134] In an optional embodiment, when the difference between the amplitude of the first real-time signal and the amplitude of the first signal parameter is greater than a first preset value, a motor operation signal is output so that the motor 4 operates according to the target working mode.

[0135] Specifically, the control module 6 detects the electrical signals at the first and second detection points in real time. When the electrical signal at the second detection point is detected, it acquires the first real-time signal at the first detection point. When the difference between the amplitude of the first real-time signal and the amplitude of the first signal parameter is greater than a first preset value, it indicates that the parameters of the first real-time signal do not match the pre-stored first signal parameters. At this time, the control module 6 outputs a motor operation signal to make the motor 4 operate according to the target working mode, so that the power tool can operate normally. Specifically, when comparing the amplitude of the first real-time signal with the amplitude of the first signal parameter, since the electrical signal generated at the first detection point is essentially changing with time, and the changing waveform is related to the component parameters, it can be considered that the waveform is fixed to a certain extent during any startup process. Thus, the comparison of amplitude can be mapped to the waveform as a comparison of time, that is, the existence time of the first real-time signal can be determined by the amplitude of the first real-time signal. Based on this, when the electrical signal at the second detection point is detected, it can be considered the moment the switch is closed. The existence time of the first real-time signal can determine the moment the power is connected. By using these two moments, it can be roughly determined whether the switch was in a closed state before the power was connected. Furthermore, the corresponding motor control signal can be output based on the judgment result. It is understood that, in addition to the amplitude, other signal parameters that can be applied to waveform comparison to determine the time difference can also be used to perform motor control in this embodiment.

[0136] Optionally, the control module 6 is configured to: acquire the second real-time signal at the second detection point; if the parameters of the second real-time signal match the pre-stored parameters of the second signal, then determine that an electrical signal at the second detection point has been detected.

[0137] The parameters of the second real-time signal are the signal parameters of the electrical signal at the second detection point acquired in real time, such as amplitude. In an optional embodiment, the pre-stored second signal parameters are the signal parameters of the electrical signal that should be generated at the second detection point when the power supply 7 is connected to the power interface 2 and the switch 3 is closed.

[0138] In one optional embodiment, the signal waveform corresponding to the first signal parameter is the same as the signal waveform corresponding to the second signal parameter. This facilitates the comparison and detection of the first real-time signal and the second real-time signal, and makes it easier to adjust the signal parameters of the other by using the signal parameters of one.

[0139] In an optional embodiment, the control module 6 is further configured to: determine whether the amplitude and / or phase difference between the second real-time signal and the second signal parameter is less than a second preset value; when the amplitude and / or phase difference between the second real-time signal and the second signal parameter is less than the second preset value, determine that the parameter of the second real-time signal matches the pre-stored second signal parameter.

[0140] Based on the same concept, embodiments of this application also provide an electric tool system. Figure 6 This is a structural block diagram of the power tool system provided in the embodiments of this application, with reference to... Figure 6 As shown, the power tool system includes: a power tool 100, a power supply 7, and a control module 6. The power supply 7 is connected to the power tool 100, which includes a motor 4. The power supply 7 supplies power to the motor 4. The power tool 100 also includes a switch 3, which connects the output of the power supply 7 to the motor 4. The control module 6 performs preset processing to adjust the operating state of the motor 4.

[0141] In an optional embodiment, the preset processing includes: controlling the power supply 7 to stop supplying power, controlling the switch 3 to open, and / or outputting a safety mode control signal.

[0142] Optionally, the control module 6 includes a first detection unit 61 and a second detection unit 62. The first detection unit 61 is electrically connected to the output terminal of the power supply 7 and is used to generate a first electrical signal after the power supply 7 is connected. The second detection unit 62 is electrically connected to the output terminal of the power supply 7 through a switch 3 and is used to generate a second electrical signal when the power supply 7 is connected after the switch 3 is closed. The control module 6 also includes a controller 63, which, after detecting the second electrical signal, performs preset processing based on the detection result of the first electrical signal to put the motor 4 into a safe mode.

[0143] The first detection unit 61 is located between the output terminal of the power supply 7 and the switch 3, and the second detection unit 63 is located between the switch 3 and the motor 4. Thus, after the power supply 7 is connected, the first detection unit 61 can generate a first electrical signal regardless of whether the switch 3 is closed. The second detection unit 62 generates a second electrical signal only when the switch 3 is closed and the power supply 7 is connected.

[0144] In an optional embodiment, when the controller 63 detects the second electrical signal and detects the first electrical signal within the first time interval, it determines the power supply access time of the first detection unit based on the signal parameters of the first electrical signal. If the power supply access time is less than or equal to the preset time detection, a preset process is executed to put the motor 4 in a safe mode.

[0145] In some embodiments, the control module 6 is a built-in control module 6 for power tools.

[0146] In some embodiments, the power supply 7 includes a battery pack, and the control module 6 is a control module built into the battery pack.

[0147] In some embodiments, the power tool system further includes a power adapter, and the control module 6 is built into the power adapter.

[0148] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. An electric tool, comprising: Electric motor; The control module is used to output motor control signals to control the operating state of the motor; A power interface, including a first terminal and a second terminal for connecting power to the power tool; A switch for connecting the power source to the motor; Its features are: The power tool further includes a first detection module electrically connected to a first terminal of the power interface, used to generate a first electrical signal after the power is connected; and a second detection module electrically connected to the first terminal of the power interface via the switch, used to generate a second electrical signal when the power is connected after the switch is closed; After detecting the second electrical signal, the control module outputs a motor control signal based on the detection result of the first electrical signal.

2. The power tool according to claim 1, characterized in that, The first terminal is connected to the first end of the first detection module and is connected to the first end of the second detection module through the switch; the second terminal is connected to the second end of the first detection module and the second end of the second detection module; the first detection module and the second detection module also have a third terminal for connecting to the control module and outputting the first electrical signal and the second electrical signal to the control module respectively.

3. The power tool according to claim 1, characterized in that, The first detection module includes a first charging unit and a first charging response unit; the first charging unit is electrically connected to a first terminal of the power interface and is used to generate a first voltage after the power is connected; the first charging response unit is electrically connected to the first charging unit. After the power supply is connected to the power interface, the first charging response unit outputs a first electrical signal in response to the first voltage generated by the first charging unit. The second detection module includes a second charging unit and a second charging response unit. The second charging unit is electrically connected to the first terminal of the power interface through the switch, and is used to connect to the power supply and generate a second voltage after the switch is closed. The second charging response unit is electrically connected to the second charging unit. After the power supply is connected to the power interface, the second charging response unit outputs a second electrical signal in response to the second voltage generated by the second charging unit.

4. The power tool according to claim 3, characterized in that, The first charging response unit includes a first voltage regulator branch, which is electrically connected to the first charging unit and the second terminal. The first voltage regulator branch is used to conduct in reverse under the action of the first voltage generated by the first charging unit, so as to stabilize the voltage generated by the first charging unit to the voltage range that the control module can accept. The second charging response unit includes a second voltage regulation branch, which is electrically connected to the second charging unit and the second terminal. The second voltage regulation branch is used to conduct in reverse under the action of the voltage generated by the second charging unit, so as to stabilize the voltage generated by the second charging unit to a voltage range that the control module can accept.

5. The power tool according to claim 4, characterized in that, The first voltage-regulating branch includes a first current-limiting resistor and a first Zener diode; one end of the first current-limiting resistor is electrically connected to the first charging unit, and the other end is electrically connected to the cathode of the first Zener diode; the anode of the first Zener diode is electrically connected to the second terminal. The second voltage-regulating branch includes a second current-limiting resistor and a second Zener diode; one end of the second current-limiting resistor is electrically connected to the second charging unit, and the other end is electrically connected to the cathode of the second Zener diode; the anode of the second Zener diode is electrically connected to the second terminal.

6. The power tool according to claim 3, characterized in that, The first charging response unit further includes a first discharge branch; the first discharge branch is electrically connected to the first charging unit and the second terminal respectively; the first discharge branch is used to release the charge stored in the first charging unit; The second charging response unit further includes a second discharge branch; the second discharge branch is electrically connected to the second charging unit and the second terminal respectively; the second discharge branch is used to release the charge stored in the second charging unit.

7. The power tool according to claim 1, characterized in that, The control module is configured as follows: When the second electrical signal is detected and the first electrical signal is not detected within the first time interval, a motor operation signal is output so that the motor operates in the target working mode.

8. The power tool according to claim 1, characterized in that, The control module is configured as follows: When the second electrical signal is detected, and the first electrical signal is detected within the first time interval, the power supply connection time of the first detection module is determined according to the signal parameters of the first electrical signal; If the power supply connection time is greater than the second time interval, a motor operation signal is output to make the motor operate in the target working mode.

9. The power tool according to claim 8, characterized in that, The control module is configured as follows: The power supply connection time of the first detection module is determined based on the signal parameters of the first electrical signal and the signal parameters of the second electrical signal.

10. An electric tool, comprising: Electric motor; The control module is used to output motor control signals to control the motor's operating state; A power interface, including a first terminal and a second terminal for connecting power to the power tool; A switch for connecting the power source to the motor; Its features are: The control module is configured as follows: Detect the electrical signals at the first detection point and the second detection point; wherein, the first detection point is the location where an electrical signal is generated when the power supply is connected to the power interface, and the second detection point is the location where an electrical signal is generated when the power supply is connected to the power interface and the switch is closed. When an electrical signal is detected at the second detection point, the first real-time signal at the first detection point is acquired. Based on the matching of the parameters of the first real-time signal with the pre-stored parameters of the first signal, a motor control signal is output.

11. The power tool according to claim 10, characterized in that, The first signal parameter is the signal parameter of the electrical signal generated at the first detection point when the power supply is connected to the power interface.

12. The power tool according to claim 10, characterized in that, The control module is specifically configured to output a motor operation signal when the difference between the amplitude of the first real-time signal and the amplitude of the first signal parameter is greater than a first preset value, so that the motor operates according to the target working mode.

13. The power tool according to claim 12, characterized in that, The control module is configured to adjust the first signal parameter based on the electrical signal at the second detection point.

14. The power tool according to claim 10, characterized in that, The control module is configured to: acquire a second real-time signal at the second detection point; if the parameters of the second real-time signal match the pre-stored second signal parameters, then determine that an electrical signal has been detected at the second detection point; wherein, the second signal parameters are the signal parameters of the electrical signal generated at the second detection point when the power supply is connected to the power interface and the switch is closed.

15. A power tool system, characterized in that, include: Power tools, including motors; A power supply, used to connect to the power tool and supply power to the motor; The power tool also includes a switch for connecting the output of the power supply to the motor; The control module is used to perform preset processing to adjust the operating state of the motor; The control module includes a first detection unit, which is electrically connected to the output terminal of the power supply, and is used to generate a first electrical signal after the power supply is connected; And a second detection unit, which is electrically connected to the output terminal of the power supply via the switch, is used to generate a second electrical signal when the power supply is connected after the switch is closed; The control module further includes a controller, which, upon detecting the second electrical signal, performs preset processing based on the detection result of the first electrical signal to put the motor into a safe mode.

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