Power tool

Abstract

Disclosed in the present application is an electric tool. The electric tool comprises: an electric motor; a power supply management apparatus, which comprises a power source and is configured to supply power to at least the electric motor; a driving apparatus, which is configured to drive the electric motor to operate so as to implement a main function of the electric tool; and an operation apparatus, which is configured to be operated by a user to enable one or more functions of the electric tool, and output to the power supply management apparatus function signals corresponding to the functions enabled by the user. The electric tool has the main function and at least one auxiliary function. The function signals comprise a main function signal corresponding to the main function and an auxiliary function signal corresponding to each auxiliary function. The power supply management apparatus is further configured to output a first enable signal when any function signal is received, and to output a third enable signal to the driving apparatus when the main function signal is received. The electric tool further comprises a first controller, which is connected to the power supply management apparatus, and is configured to output a first driving signal to the driving apparatus when at least the first enable signal is received. The driving apparatus is further configured to drive the operation of the electric motor when the third enable signal is received and the first driving signal is received.

Description

power tools

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 2, 2023 with application number 202310650856.2 and the Chinese patent application filed with the China Patent Office on July 6, 2023 with application number 202310827744.X, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates specifically to a power tool. Background Art

[0003] The free end of the output shaft of an electric tool is generally equipped with functional parts such as a drill bit or a saw blade, and is provided with an operating part that can be operated by the user to switch the tool's on / off state. When the user operates the electric tool to switch from the off state to the on state, the motor in the tool will be driven to operate so that the functional parts can perform operations such as tightening and cutting. When the user operates the electric tool to switch from the on state to the off state, the motor in the tool will be controlled to stop, and the functional parts will also stop operating. In addition, in some scenarios, after the motor in the tool stops, the user may still need to use the lighting, display and other functions of the electric tool.

[0004] This section provides background information related to the present application which is not necessarily prior art.

[0005] Summary of the Invention

[0006] One object of the present application is to solve or at least alleviate a part or all of the above problems. To this end, one object of the present application is to provide an electric tool.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] An electric tool comprises: a motor; a power supply management device, comprising a power supply and configured to supply power to at least the motor; a drive device, configured to drive the motor to operate so as to realize the main function of the electric tool; an operating device, configured to be operated by a user to enable one or more functions of the electric tool, and output a function signal corresponding to the function enabled by the user to the power supply management device; the electric tool has a main function and at least one auxiliary function, and the function signal comprises a main function signal corresponding to the main function and an auxiliary function signal corresponding to each auxiliary function; wherein the power supply management device is further configured to output a first enable signal when any function signal is received, and output a third enable signal to the drive device when the main function signal is received; the electric tool further comprises: a first controller, connected to the power supply management device and configured to output a first drive signal to the drive device when at least the first enable signal is received; wherein the drive device is further configured to drive the motor to operate when the third enable signal and the first drive signal are received.

[0009] In some embodiments, the operating device is also configured to output a main function signal to the first controller when the user enables the main function; the first controller is also connected to the operating device and is also configured to output a first drive signal to the drive device when it receives the first enable signal and the main function signal.

[0010] In some embodiments, the driving device includes a driving circuit and a driving signal generating circuit; the first controller is further configured to output a first driving signal to the driving circuit and a second driving signal to the driving signal generating circuit when at least a first enable signal is received; the driving signal generating circuit is configured to output a second driving signal after voltage boosting to the driving circuit when a third enable signal and a second driving signal are received; the driving circuit is configured to drive the motor to operate when the first driving signal and the second driving signal are received.

[0011] In some embodiments, the driving device includes a driving circuit and a driving integrated chip; the first controller is also configured to output a first driving signal to the driving integrated chip when at least a first enable signal is received; the driving integrated chip is configured to output a processed first driving signal to the driving circuit when a third enable signal and the first driving signal are received; the driving circuit is configured to drive the motor to operate when the first driving signal is received.

[0012] In some embodiments, the power tool also includes: an auxiliary device, configured to realize the auxiliary function of the power tool; a second controller, connected to the operating device and to the power supply management device; the operating device is also configured to output a function signal corresponding to the function enabled by the user to the second controller; the power supply management device is also configured to output a second enable signal to the second controller when any function signal is received; the second controller is configured to control the operation of the corresponding auxiliary device to realize the corresponding auxiliary function when it receives the second enable signal and receives an auxiliary function signal corresponding to any auxiliary function.

[0013] In some embodiments, the auxiliary function includes an interface display function, and the auxiliary device includes an interface display device corresponding to the interface display function; the second controller is also configured to light up the interface display device and turn off the interface display device after a first preset time period when it receives a second enable signal and an auxiliary function signal corresponding to the interface display function.

[0014] In some embodiments, the auxiliary function includes a power display function, and the auxiliary device includes a power display device corresponding to the power display function; the second controller is also configured to light up the power display device and turn off the power display device after a second preset time when it receives a second enable signal and an auxiliary function signal corresponding to the power display function.

[0015] In some embodiments, the operating device is further configured to be operated by the user to turn off one or more functions of the power tool, and to interrupt the output of function signals corresponding to the functions turned off by the user to the second controller and the power supply management device.

[0016] In some embodiments, the second controller is also configured to output a first maintenance signal to the power supply management device and interrupt the transmission of the first maintenance signal after a third preset time period when the main function signal is lost; the power supply management device is also configured to interrupt the output of the third enable signal to the driving device when the main function signal and the first maintenance signal are lost.

[0017] In some embodiments, the second controller is also configured to output a second maintenance signal to the power supply management device and interrupt the transmission of the second maintenance signal after a fourth preset time period when all functional signals are lost; the fourth preset time period is greater than or equal to the third preset time period; the power supply management device is also configured to interrupt the output of the first enable signal to the first controller when all functional signals are lost and the second maintenance signal is lost.

[0018] In some embodiments, the second controller is also configured to output a third maintenance signal to the power supply management device and interrupt the transmission of the third maintenance signal after a fifth preset time period when all functional signals are lost; the fifth preset time period is greater than or equal to the fourth preset time period; the power supply management device is also configured to interrupt the output of the second enable signal to the second controller when all functional signals are lost and the third maintenance signal is lost.

[0019] A bench tool comprises: a workbench having at least one work surface for placing a workpiece; a cutting assembly for acting on the workpiece; a motor for operating to drive the cutting assembly to realize a main function of the bench tool; a power management device comprising a power source and configured to supply power to at least the motor; a drive device configured to drive the motor to realize the main function of the bench tool; an operating device configured to be operated by a user to enable one or more functions of the power tool and to output a function signal corresponding to the function enabled by the user to the power management device; the bench tool having a main function and at least one auxiliary function, the function signal comprising a main function signal corresponding to the main function and auxiliary function signals corresponding to each auxiliary function; wherein the power management device is further configured to output a first enable signal upon receiving any function signal, and to output a third enable signal to the drive device upon receiving the main function signal; the bench tool further comprises: a first controller connected to the power management device and configured to output a first drive signal to the drive device upon receiving at least the first enable signal; wherein the drive device is further configured to drive the motor upon receiving the third enable signal and the first drive signal.

[0020] An electric tool comprises: a motor; a power supply management device, comprising a power supply and configured to supply power to at least the motor; a drive device, configured to drive the motor to operate so as to realize the main function of the electric tool; an operating device, configured to be operated by a user to enable the main function, and output a main function signal corresponding to the main function to the power supply management device; wherein the power supply management device is further configured to output a first enable signal upon receiving the main function signal, and output a third enable signal to the drive device; the electric tool further comprises: a first controller, connected to the power supply management device and configured to output a first drive signal to the drive device upon receiving at least the first enable signal; wherein the drive device is further configured to drive the motor to operate upon receiving the third enable signal and the first drive signal.

[0021] A method for controlling an electric tool, comprising: when a user enables one or more functions of the electric tool, an operating device outputs a function signal corresponding to the function enabled by the user to a power supply management device; when the power supply management device receives any function signal, the operating device outputs a first enable signal to a first controller, and when the power supply management device receives a main function signal corresponding to the main function, the operating device outputs a third enable signal to a drive device; when the first controller receives at least the first enable signal, the operating device outputs a first drive signal to the drive device; when the drive device receives the third enable signal and the first drive signal, the driving device drives the motor to operate to realize the main function.

[0022] An electric tool comprises: a motor; a power supply management device, comprising a power supply and configured to supply power to at least the motor; a driving device, configured to drive the motor to operate; an operating device, configured to be operated by a user to switch the on / off state of the electric tool and output a corresponding on signal or off signal; wherein the electric tool further comprises: a first controller, connected to the operating device and the driving device, and configured to output a driving signal to the driving device upon receiving the on signal; a second controller, connected to the operating device and the driving device, and configured to output a driving enable signal to the driving device upon receiving the on signal; the driving device is further configured to drive the motor to operate upon receiving the driving signal and the driving enable signal.

[0023] In some embodiments, the first controller is further configured to stop outputting the driving signal to the driving device upon receiving a shutdown signal.

[0024] In some embodiments, the power management device is connected to the first controller, and the power management device is further configured to output a first enable signal to the first controller when receiving the start signal.

[0025] In some embodiments, the first controller is also configured to output a first power-off signal to the power supply management device after waiting for a sixth preset time period upon receiving a shutdown signal; the power supply management device is also configured to stop outputting a first enable signal to the first controller upon receiving the first power-off signal.

[0026] In some embodiments, the first controller is further configured to output a maintenance signal to the power supply management device when receiving a start signal; the power supply management device is further configured to continue to output the first enable signal to the first controller when losing the start signal and receiving the maintenance signal.

[0027] In some embodiments, the first controller is also configured to stop outputting the maintenance signal to the power supply management device after waiting for a sixth preset time period when receiving a shutdown signal; the power supply management device is also configured to stop outputting the first enable signal to the first controller when the maintenance signal is lost.

[0028] In some embodiments, the power tool also includes: a parameter detection device, connected to the motor and the second controller, and configured to detect the operating parameters of the motor and transmit the operating parameters of the motor to the second controller; the second controller is also configured to output a second power-off signal to the power supply management device after receiving the shutdown signal and after a seventh preset time period, when the operating parameters are still in a changing state; the power supply management device is also configured to stop outputting the first enable signal to the first controller when receiving the second power-off signal.

[0029] In some embodiments, the second controller is further configured to stop outputting the drive enable signal to the drive device after receiving the shutdown signal and a seventh preset time period has elapsed.

[0030] In some examples, the first controller is further configured to stop outputting the driving signal to the driving device when the first enabling signal is lost.

[0031] A method for controlling an electric tool comprises: when the electric tool is switched to an on state, an operating device outputs an on signal to a first controller and a second controller; when the first controller receives the on signal, the first controller outputs a drive signal to a drive device; when the second controller receives the on signal, the second controller outputs a drive enable signal to the drive device; and when the drive device receives both the drive signal and the drive enable signal, the drive motor drives the motor to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a perspective view of a power tool according to an embodiment.

[0033] FIG2 is a schematic diagram of the electric control principle of the electric tool shown in FIG1 .

[0034] FIG3 is a circuit block diagram of the operating device in the electric tool shown in FIG2 .

[0035] FIG4 is a circuit block diagram of the power supply management device in the power tool shown in FIG2 .

[0036] FIG5 is a circuit block diagram of the driving device in the electric tool shown in FIG2 .

[0037] FIG6 is another circuit block diagram of the driving device in the electric tool shown in FIG2 .

[0038] FIG. 7 is another electrical control schematic diagram of the power tool shown in FIG. 1 .

[0039] FIG8 is a circuit block diagram of the power supply management device in the power tool shown in FIG7 .

[0040] FIG9 is another electrical control schematic diagram of the electric tool shown in FIG1 .

[0041] FIG10 is a circuit block diagram of the power supply management device in the electric tool shown in FIG9 .

[0042] FIG. 11 is a flow chart showing a method for controlling a power tool according to an embodiment.

[0043] FIG. 12 is a perspective view of a power tool according to an embodiment.

[0044] FIG13 is a schematic diagram of the electric control principle of the electric tool shown in FIG12 .

[0045] FIG14 is a circuit block diagram of the motor, drive device, first controller, and second controller in the electric tool shown in FIG13 .

[0046] FIG15 is a partial circuit diagram of the driving device in the electric tool shown in FIG14.

[0047] FIG16 is another electrical control schematic diagram of the electric tool shown in FIG12 .

[0048] FIG17 is a partial circuit diagram of the power supply management device and the operating device in the electric tool shown in FIG16 .

[0049] FIG18 is another electrical control schematic diagram of the electric tool shown in FIG12 .

[0050] FIG19 is a partial circuit diagram of the power supply management device and the operating device in the electric tool shown in FIG18 .

[0051] FIG. 20 is a flow chart showing a method for controlling an electric tool according to an embodiment. DETAILED DESCRIPTION

[0052] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0053] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0054] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0055] In this application, the terms "connect," "combine," "couple," and "install" may 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 an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0056] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0057] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0058] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, front lower and back lower, etc.

[0059] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0060] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0061] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0062] The technical solution of this application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] Figure 1 shows an electric tool 100 as an embodiment of the present application. The electric tool 100 shown in Figure 1 is a bench-type tool, and the electric tools in other embodiments may also be handheld electric tools or other forms of electric tools.

[0064] The power tool 100 has a primary function and at least one auxiliary function. The primary function is the primary purpose for which the user uses the power tool 100. In most cases, the primary function is driven by the motor. For example, the primary function may be cutting. The auxiliary function may be a function that assists the primary function or a secondary function unrelated to the primary function. For example, an auxiliary function may be a display function, including the display of a table saw mode indicator light or the display of a miter saw speed control interface.

[0065] Refer to Figure 2, which is a schematic diagram of the electrical control principle of the power tool shown in Figure 1. The power tool 200 includes: a motor 10, a power supply management device 20, and a drive device 30. Among them, the motor 10 can be connected to a cutting component such as a saw blade, and after operation, it can drive a cutting component such as a saw blade to realize the main functions of the power tool 200. In some examples, the motor 10 can be a brushless motor. The power supply management device 20 includes a power supply, which can at least supply power to the motor 10. In some examples, the power supply management device 20 may include a power supply, a transistor, and a power chip. The drive device 30 is connected to the motor 10 and can drive the motor 10 to operate to realize the main functions of the power tool 200. In some examples, the drive device 30 may include a three-phase inverter bridge.

[0066] The power tool 200 also includes an operating device 40 for the user to operate to enable any one or more functions of the power tool 200. In some examples, the operating device 40 may include a mechanical switch, a signal switch, etc. The operating device 40 is connected to the power supply management device 20. After the user operates to enable any one or more functions of the power tool 200, the operating device 40 may output a function signal corresponding to the function enabled by the user to the power supply management device 20. Among them, the function signal corresponding to the main function is the main function signal, and the function signal corresponding to each auxiliary function is the auxiliary function signal. In one case, the user only enables the main function through the operating device 40, and the operating device 40 only outputs the main function signal to the power supply management device 20; in another case, the user enables any one or more auxiliary functions, and the operating device 40 outputs the auxiliary function signal corresponding to each enabled auxiliary function; in other cases, the user enables both the main function and any one or more auxiliary functions, and the operating device 40 simultaneously outputs the main function signal and the corresponding auxiliary function signal.

[0067] The power supply management device 20 is capable of receiving function signals from the operating device 40 and can be configured to output a first enable signal that meets the voltage requirements of the first controller 50, such as a 12V voltage signal, to the first controller 50, which will be described later, upon receiving any function signal; and to output a third enable signal to the drive device 30 upon receiving a primary function signal. In one case, the power supply management device 20 receives only the primary function signal and outputs the first enable signal to the first controller 50 and the third enable signal to the drive device 30; in another case, the power supply management device 20 receives any one or more auxiliary function signals and outputs the first enable signal to the first controller 50; in other cases, the power supply management device 20 receives both the primary function signal and any one or more auxiliary function signals and outputs the first enable signal to the first controller 50 and the third enable signal to the drive device 30.

[0068] The power tool 200 also includes a first controller 50 for controlling and implementing the primary function. In some examples, the first controller 50 may include a processor such as a CPU or MCU, and a memory storing processor-executable instructions. In some embodiments, the first controller 50 is connected to the power management device 20 and the drive device 30, and is capable of receiving a first enable signal from the power management device 20. The first controller 50 may be configured to output a first drive signal to the drive device 30 upon receiving at least the first enable signal. In other embodiments, the first controller 50 is also connected to the operating device 40. After a user activates the primary function, the operating device 40 also outputs the primary function signal to the first controller 50. The first controller 50 will then output the first drive signal to the drive device 30 upon receiving both the first enable signal and the primary function signal.

[0069] The driving device 30 is capable of receiving a third enable signal from the power supply management device 20 and a first drive signal from the first controller 50, and can be configured to drive the motor 10 to operate to realize the main function of the power tool 200 after receiving the third enable signal and the first drive signal; and cannot drive the motor 10 to operate when only the first drive signal is received and the third enable signal is not received.

[0070] The following is a more detailed description of each device in the power tool 200 shown in FIG. 2 .

[0071] Referring to Figure 3, which is a circuit block diagram of the operating device 40 in the power tool 200 shown in Figure 2, in one embodiment, the operating device 40 may include a switch 41 representing a primary function, a switch 42 representing a first auxiliary function, and a switch 43 representing a second auxiliary function. Terminal A is connected to the power supply. When the user presses switch 41, terminals AB are connected, and terminal B receives a primary function signal. When the user presses switch 42, terminal AC is connected, and terminal C receives an auxiliary function signal corresponding to the first auxiliary function. When the user presses switch 43, terminal AD is connected, and terminal D receives an auxiliary function signal corresponding to the second auxiliary function. When the user presses any one or more of switches 41, 42, or 43, terminal E detects that the user has activated at least one function.

[0072] Referring to Figure 4, a circuit block diagram of the power management device 20 in the power tool 200 shown in Figure 2 is provided. In one embodiment, the power management device 20 may include a power supply (not shown), a first transistor group 21, a first power chip 22, and a third transistor group 24. The first transistor group 21 is connected to the operating device 40, the power supply, and the first power chip 22. The first power chip 22 is further connected to the third transistor group 24 and the first controller 50. The third transistor group 24 is further connected to the operating device 40 and the drive device 30.

[0073] When the user enables the main function, the first transistor group 21 receives the main function signal from the operating device 40 and then turns on the path between it and the first power chip 22. The first power chip 22 then outputs the first enable signal to the third transistor 24 and the first controller 50. After the third transistor 24 receives the first enable signal from the first power chip 22 and the main function signal from the operating device 40, it outputs the third enable signal to the driving device 30.

[0074] When the user enables any one or more auxiliary functions but does not enable the main function, the first transistor group 21 receives the auxiliary function signal from the operating device 40 and then turns on the path between it and the first power chip 22. The first power chip 22 then outputs the first enable signal to the third transistor 24 and the first controller 50. However, the third transistor 24 does not receive the main function signal and cannot output the third enable signal to the driving device 30.

[0075] Referring to Figure 5 , which is a circuit block diagram of the drive device 30 in the power tool 200 shown in Figure 2 , the drive device 30 may include a drive circuit 31 and a drive signal generating circuit 32 . The drive circuit 31 is connected to the drive signal generating circuit 32 and the first controller 50 and may be a three-phase inverter bridge composed of six switching elements. By controlling the on and off of the six switching elements, the motor 10 can be commutated. The drive signal generating circuit 32 is also connected to the power management device 20 and the first controller 50 and may be a bootstrap circuit capable of boosting the voltage of the received signal.

[0076] The first controller 50 may also be configured to, after receiving at least the first enable signal, output a first drive signal for controlling three switching elements in the drive circuit 31 to the drive circuit 31, and output a second drive signal for controlling the other three switching elements in the drive circuit 31 to the drive signal generation circuit 32. In some examples, the first controller 50 includes, in addition to the processor and the memory, a power amplifier circuit capable of amplifying the power of the output first drive signal and outputting the amplified first drive signal to the drive circuit 31.

[0077] The drive signal generating circuit 32 receives the second drive signal from the first controller 50 and the third enable signal from the power supply management device 20, and can be configured to boost the second drive signal and output the boosted second drive signal to the drive circuit 31 after receiving the second drive signal and the third enable signal.

[0078] The driving circuit 31 is capable of receiving a first driving signal from the first controller 50 and a second driving signal from the driving signal generating circuit 32, and can be configured to drive the motor 10 to operate to realize the main function of the power tool 200 after receiving the first driving signal and the second driving signal.

[0079] When the user enables the main function, the drive signal generating circuit 32 outputs the second drive signal after boosting to the drive circuit 31 after receiving the third enable signal from the power supply management device 20 and the second drive signal from the first controller 50. The drive circuit 31 drives the motor 10 to operate after receiving the first drive signal from the first controller 50 and the second drive signal from the drive signal generating circuit 32.

[0080] When the user enables any one or more auxiliary functions but does not enable the main function, the drive signal generating circuit 32 does not receive the third enable signal from the power supply management device 20 and cannot output the second drive signal to the drive circuit 31. The drive circuit 31 does not receive the second drive signal from the drive signal generating circuit 32 and cannot drive the motor 50 to operate.

[0081] Referring to Figure 6 , which is another circuit block diagram of the drive device 30 in the power tool 200 shown in Figure 2 , in another embodiment, the drive device 30 may include a drive circuit 31 and a driver integrated chip 33. The drive circuit 31 is connected to the driver integrated chip 33; the driver integrated chip 33 is also connected to the power management device 20 and the first controller 50.

[0082] The first controller 50 may also be configured to output the first and / or second drive signals for controlling the drive circuit 31 to the drive integrated chip 33 after receiving at least the first enable signal. The drive integrated chip 33 receives the drive signal from the first controller 50 and the third enable signal from the power supply management device 20, and may be configured to process the drive signal after receiving the drive signal and the third enable signal and output the processed drive signal to the drive circuit 31. The drive circuit 31 is capable of receiving the processed drive signal from the drive integrated chip 33, and may be configured to drive the motor 10 to operate to achieve the main functions of the power tool 200 after receiving the drive signal.

[0083] When the user enables the main function, the driver integrated chip 33 outputs the processed drive signal to the drive circuit 31 after receiving the third enable signal from the power supply management device 20 and the drive signal from the first controller 50. After receiving the drive signal from the driver integrated chip 33, the drive circuit 31 drives the motor 10 to operate.

[0084] When the user enables any one or more auxiliary functions but does not enable the main function, the driver integrated chip 33 does not receive the third enable signal from the power supply management device 20 and cannot output the processed drive signal to the drive circuit 31. The drive circuit 31 does not receive the drive signal from the driver integrated chip 33 and cannot drive the motor 10 to operate.

[0085] In the implementation scheme described in Figures 2 to 6, at least two drive signals are required for the normal operation of the drive motor. Although the first drive signal can be issued after the first controller is powered on, the third enable signal issued by the power supply management device is independently dependent on user operation, thereby ensuring that the motor will not start accidentally when the auxiliary function is enabled but the main function is not enabled or when the first controller fails, meeting product safety regulations and improving the safety of the tool and the user experience.

[0086] In addition, in other embodiments, the power tool 200 may also have only the main function. When the user enables the main function of the power tool 200, the operating device 40 outputs the main function signal to the power supply management device 20. After receiving the main function signal, the power supply management device 20 outputs the first enable signal to the first controller 50 and outputs the third enable signal to the drive device 30. After receiving at least the first enable signal, the first controller 50 outputs the first drive signal to the drive device 30. After receiving the third enable signal and the first drive signal, the drive device 30 drives the motor 10 to operate to realize the main function, so that the power tool motor will not start accidentally when the first controller fails, which can ensure user safety and improve user experience.

[0087] Referring to Figure 7, which is another electrical control schematic diagram of the power tool shown in Figure 1, the power tool 300 includes, in addition to the motor 10, the power management device 20, the drive device 30, the drive device 40, and the first controller 50, an auxiliary device 60. The number of auxiliary devices 60 may correspond to the number of auxiliary functions of the power tool 300. That is, each auxiliary device implements a corresponding auxiliary function. In some examples, the auxiliary function is a display function, and the auxiliary device may be an LED light assembly or a display screen.

[0088] To ensure that all functions of the power tool can be smoothly implemented without interfering with each other, based on the power tool 200 described above, the operating device 40 can also output a function signal corresponding to the function enabled by the user to the second controller 70, which will be described later. The power management device 20 can also be configured to output a second enable signal that meets the voltage requirement of the second controller 70, such as a 3.3V voltage signal, to the second controller 70 after receiving any function signal.

[0089] The power tool 300 also includes a second controller 70 for controlling and implementing auxiliary functions. In some examples, the second controller 70 may include a processor such as a CPU or an MCU, and a memory storing processor-executable instructions. The second controller 70 is connected to the operating device 10 and the power management device 20, and is capable of receiving a function signal from the operating device 10 and a second enable signal from the power management device 20. Upon receiving the second enable signal and the auxiliary function signal, the second controller 70 may be configured to control the operation of the corresponding auxiliary device to implement the corresponding auxiliary function.

[0090] In one embodiment, the power tool 300 has an auxiliary function, namely an interface display function. The auxiliary device includes an interface display device 61 corresponding to the interface display function. After the user enables the interface display function through the operating device 40, the operating device 40 outputs a first auxiliary function signal corresponding to the interface display function to the power supply management device 20 and the second controller 70. The power supply management device 20 outputs a second enable signal to the second controller 70. After receiving the second enable signal and the first auxiliary function signal, the second controller 70 lights up the interface display device 61 and turns off the interface display device 61 after the first preset time T1.

[0091] In another embodiment, the power tool 300 has, in addition to the interface display function, another auxiliary function: a power display function. The auxiliary device includes, in addition to the interface display device 61, a power display device 62 corresponding to the power display function. The user enables the power display function and the power display function at the same time through the operating device 40. The operating device 40 outputs a first auxiliary function signal corresponding to the interface display function and a second auxiliary function signal corresponding to the power display function to the power supply management device 20 and the second controller 70. The power supply management device 20 outputs a second enable signal to the second controller 70. After receiving the second enable signal, the first auxiliary function signal and the second auxiliary function signal, the second controller 70 lights up the interface display device 61 and turns off the interface display device 61 after a first preset time T1, and lights up the power display device 62 and turns off the power display device 62 after a second preset time T2. For example, the first preset time T1 can be 5 minutes, and the second preset time T2 can be 10 seconds.

[0092] The following is a more detailed description of each device in the power tool 300 shown in FIG. 7 .

[0093] Referring to Figure 8, Figure 8 is a circuit block diagram of the power management device 20 in the power tool 300 shown in Figure 7. In one embodiment, the power management device 20 may include a power supply (not shown), a first transistor group 21, a first power chip 22, a second transistor group 23, a third transistor group 24, and a second power chip 25. The first transistor group 21 is connected to the operating device 40, the power supply, and the first power chip 22. The first power chip 22 is also connected to the second transistor group 23 and the second power chip 25. The second transistor group 23 is also connected to the first controller 50 and the third transistor group 24. The third transistor group 24 is also connected to the operating device 40 and the drive device 30.

[0094] When the user enables the main function, the first transistor group 21 receives the main function signal from the operating device 40 and then turns on the path between it and the first power chip 22. The first power chip 22 then turns on the path between it and the second power chip 25 and the second transistor group 23. The second power chip 25 then outputs the second enable signal to the second controller 70. The second transistor group 23 then outputs the first enable signal to the first controller 50 and the third transistor group 24. The third transistor group 24 receives the first enable signal from the second transistor group 22 and the main function signal from the operating device 40 and then outputs the third enable signal to the drive device 30.

[0095] When the user enables any one or more auxiliary functions but does not enable the main function, the first transistor group 21 receives the auxiliary function signal from the operating device 40 and then turns on the path between it and the first power chip 22. The first power chip 22 then turns on the path between it and the second power chip 25 and the second transistor group 23. The second power chip 25 then outputs the second enable signal to the second controller 70. The second transistor group 23 then outputs the first enable signal to the first controller 50 and the third transistor group 24. The third transistor 24 does not receive the main function signal and cannot output the third enable signal to the drive device 30.

[0096] In the above embodiment, the first power chip no longer directly supplies power to the first controller. Instead, the first power chip leads to the second transistor group and the second power chip to supply power to the first and second controllers respectively, so that the power supply processes of the first and second controllers can be independent of each other, and the interruption of power supply to the first controller will not interfere with the second controller.

[0097] In the implementation described in Figures 7 to 8, two controllers are used to be responsible for the main functions and auxiliary functions of the power tool respectively. In response to different functional signals, the first controller and the second controller can independently control the motor and each auxiliary device to achieve corresponding functions. The two do not interfere with each other, thereby ensuring that the power tool can work normally according to the user's actual intention.

[0098] 9 is another electrical control schematic diagram of the power tool shown in FIG1 . The power tool 400 may include a motor 10 , a power management device 20 , a drive device 30 , a drive device 40 , a first controller 50 , an auxiliary device 60 , and a second controller 70 .

[0099] Taking into account that the start and stop of the main functions of the power tool depend on the user's operation, and the auxiliary functions are turned on by the user and turned off automatically after a default period of time, in order to ensure that the start and stop of each function can be smoothly realized, based on the power tool 300 described above, the operating device 40 can also interrupt the output of the function signal corresponding to the function turned off by the user to the power supply management device 20 and the second controller 70 after the user turns off any one or more functions of the power tool 400.

[0100] When the second controller 70 loses the functional signal from the operating device 40, it can be set to output a first maintenance signal to the power supply management device 20 after losing the main functional signal and interrupt the transmission of the first maintenance signal after the third preset time T3; and after losing all functional signals, output a second maintenance signal and a third maintenance signal to the power supply management device 20, and interrupt the transmission of the second maintenance signal after the fourth preset time T4, and interrupt the transmission of the third maintenance signal after the fifth preset time T5.

[0101] The power supply management device 20 loses the functional signal from the operating device 40 and receives the maintenance signal from the second controller 70. It can be set to continue outputting the third enable signal when the main functional signal is lost and the first maintenance signal is obtained, and after the third preset time T3, after the main functional signal and the first maintenance signal are lost, the output of the third enable signal to the driving device 30 is interrupted; when all functional signals are lost and the second maintenance signal is obtained, the output of the first enable signal continues, and after the fourth preset time T4, after all functional signals and the second maintenance signal are lost, the output of the first enable signal to the first controller 50 is interrupted; and when all functional signals are lost and the third maintenance signal is obtained, the output of the second enable signal continues, and after the fifth preset time T5, after all functional signals and the third maintenance signal are lost, the output of the second enable signal to the second controller 70 is interrupted.

[0102] Among them, the third preset time length T3 is less than or equal to the fourth preset time length T4, and the fourth preset time length T4 is less than or equal to the fifth preset time length T5. For example, the third preset time length T3 and the fourth preset time length T4 can be 10 seconds, and the fifth preset time length T5 can be 5 minutes. In addition, the fifth preset time length T5 is greater than or equal to the time taken by each auxiliary device to implement the corresponding auxiliary function, so that the auxiliary function can be completed before the device is powered off. For example, the first preset time length T1 for the interface display device 61 to implement the interface display function is 5 minutes, the second preset time length T2 for the power display device 62 to implement the power display function is 10 seconds, and the fifth preset time length T5 can be 5 minutes.

[0103] The following is a more detailed description of each device in the power tool 400 shown in FIG. 9 .

[0104] Referring to FIG10 , FIG10 is a circuit block diagram of the power management device 20 in the power tool 400 shown in FIG9 . In one embodiment, the power management device 20 may include a power supply (not shown), a first transistor group 21, a first power chip 22, a second transistor group 23, a third transistor group 24, and a second power chip 25. The first transistor group 21 is connected to the operating device 40, the power supply, the first power chip 22, and the second controller 70. The first power chip 22 is also connected to the second transistor group 23 and the second power chip 25. The second transistor group 23 is also connected to the first controller 50, the third transistor group 24, and the second controller 70. The third transistor group 24 is also connected to the operating device 40, the drive device 30, and the second controller 70.

[0105] For example, if the third preset time duration T3 and the fourth preset time duration T4 are 10 seconds, and the fifth preset time duration T5 is 5 minutes, when the user only turns off the primary function, the third transistor group 24 receives the first hold signal when the primary function signal is lost, and can continue to output the third enable signal until the first hold signal is lost 10 seconds later, at which point the third enable signal to the drive device 30 is discontinued, causing the motor 10 to stop 10 seconds after the user turns off the primary function.

[0106] When the user only turns off the auxiliary function, the output of the first enable signal, the second enable signal and the third enable signal are not affected. For the auxiliary function signals that have been received, the second controller 70 can still implement the corresponding auxiliary function according to the corresponding time control required by each auxiliary function.

[0107] When the user turns off all functions, in addition to the third transistor group described above interrupting the output of the third enable signal after 10 seconds to shut down the motor 10, the second transistor group 23 receives a second maintenance signal when all function signals are lost and can continue to output the first enable signal until the second maintenance signal is lost after 10 seconds, interrupting the output of the first enable signal to the first controller 50, thereby causing the first controller 50 to be powered off 10 seconds after the user turns off all functions. At the same time, the first transistor group 21 receives a third maintenance signal when all function signals are lost and can continue to conduct the path between it and the first power chip 22 and the second power chip 25, maintaining the output of the second enable signal until the third maintenance signal is lost after 5 minutes, disconnecting the path between it and the first power chip 22 and the second power chip 25. The second power chip 25 interrupts the output of the second enable signal to the second controller 70, thereby causing the second controller 70 to be powered off 5 minutes after the user turns off all functions. During these 5 minutes, for each auxiliary function signal that has been received, the second controller 70 can still implement the corresponding auxiliary function according to the duration control required by each auxiliary function.

[0108] In the implementation described in Figures 9 to 10, the second controller outputs a corresponding maintenance signal to the power supply management device according to the corresponding preset duration based on the function turned off by the user. The power supply management device determines whether to interrupt the output of the enable signal and the drive signal based on the function signal and the maintenance signal to ensure that the first and second controllers can successfully execute various functions without interfering with each other, and can also cut off the power in time after the function is executed, meeting product safety regulations and improving the safety of the tool and the user experience.

[0109] Figure 11 shows a control method for an electric tool as an embodiment of the present application. The control method shown in Figure 11 can be applied to the electric tool described above.

[0110] The control method of the electric tool may include the following specific steps:

[0111] S1102, when the user activates one or more functions of the power tool, the operating device outputs a function signal corresponding to the function activated by the user to the power supply management device;

[0112] S1104, the power supply management device outputs a first enable signal to the first controller when receiving any function signal, and outputs a third enable signal to the driving device when receiving a primary function signal corresponding to a primary function;

[0113] S1106, when the first controller receives at least the first enable signal, outputs a first drive signal to the drive device;

[0114] S1108 , when the driving device receives the third enable signal and the first driving signal, the driving motor operates to realize the main function.

[0115] Figure 12 shows an electric tool 500 as another embodiment of the present application. The electric tool 500 shown in Figure 12 is a DC electric drill. The electric tools in other embodiments may also be other types of handheld electric tools such as nail guns and electric circular saws, or bench-type tools such as table saws and miter saws.

[0116] Referring to Figure 13, Figure 13 is a schematic diagram of the electrical control circuitry of the power tool 500 shown in Figure 12. The power tool 500 includes a motor 510, a power management device 520, and a drive device 530. The motor shaft of the motor 510 can rotate, directly or indirectly through a transmission assembly, to drive an output shaft, thereby driving a connected component such as a drill bit or saw blade to perform tasks such as fastening or cutting. In some examples, the motor 510 can be a brushless DC motor. The power management device 520 includes a power source and is capable of supplying power to at least the motor 510. In some examples, the power management device 520 can include a removable power source such as a battery pack, as well as integrated power chips, transistors, and components such as resistors, capacitors, and inductors. The drive device 530 is connected to the motor 510 and is capable of driving the motor 510 to perform tasks such as fastening and cutting. In some examples, the drive device 530 can include a three-phase inverter bridge, a driver chip, and the like.

[0117] The power tool 500 also includes an operating device 540 for the user to operate to switch the power tool 500 on and off. In some examples, the operating device 540 may include a mechanical switch, a signal switch, etc. The operating device 540 is connected to the power supply management device 520 and is connected to the first controller 550 and the second controller 560 to be described later. When the user activates the power tool 500, the operating device 540 may output an on signal to the first controller 550 and the second controller 560, indicating that the power tool is activated. When the user stops using the power tool 500, the operating device 540 may output an off signal to the first controller 550 and the second controller 560, indicating that the power tool is deactivated. In some examples, the on signal and the off signal may be voltage signals or voltage jump signals, for example, a high voltage signal is the on signal and a low voltage signal is the off signal. In other examples, the on signal and the off signal may also be digital signals with more complex formats that carry specific information.

[0118] The power tool 500 also includes a first controller 550 and a second controller 560. In some examples, the first controller 550 may include a processor such as a CPU (Central Processing Unit), an MCU (Microcontroller Unit), and a memory storing processor-executable instructions, and the same is true for the second controller 560.

[0119] The first controller 550 is connected to the driving device 530 and the operating device 540, and is capable of receiving a start signal from the operating device 540. The first controller 550 can be configured to output a drive signal to the driving device 530 upon receiving the start signal. Specifically, the drive signal is a control signal of the driving device 530, which is used to control the normal operation of the driving device 530.

[0120] The second controller 560 is connected to the driving device 530 and the operating device 540 and is capable of receiving a start signal from the operating device 540. The second controller 560 can be configured to output a drive enable signal to the driving device 530 upon receiving the start signal. Specifically, the drive enable signal is a power supply signal or an activation signal for the driving device 530, which is used to provide power to the driving device 530 or activate components in the driving device 530.

[0121] The driving device 530 is connected to the motor 510, the first controller 550, and the second controller 560, and can receive a driving signal from the first controller 550 and a driving enable signal from the second controller 560. The driving device 530 can be configured to drive the motor 510 when it receives both the driving signal and the driving enable signal; and not to drive the motor 510 when it only receives the driving signal but not the driving enable signal, or when it only receives the driving enable signal but not the driving signal.

[0122] The following is a more detailed description of each device in the power tool 500 shown in FIG. 13 .

[0123] Referring to FIG14 , in some embodiments, the drive device 530 may be a drive circuit composed of multiple semiconductor switching elements. In the case where the motor 510 is a three-phase motor, the drive circuit may be composed of six semiconductor switching elements. The drive signal output by the first controller 550 will be transmitted to each semiconductor switching element in the drive device 530 to change the on / off state of each semiconductor switching element, thereby changing the voltage state or current state applied to each winding of the motor 510, thereby controlling the motor 510 to perform phase switching. The drive enable signal output by the second controller 560 will also be transmitted to the drive device 530 to power or turn on the components therein, so that the motor control based on the above drive signal has an energy basis or can be successfully activated. As shown in FIG14 and FIG15 , the motor 510 is a three-phase motor. The U-phase portion of the drive circuit in the drive device 530 may include multiple transistors Q11, Q12, multiple resistors, and rectifier diodes. In some examples, the transistors Q11 and Q12 in the drive circuit can also be replaced with other semiconductor components such as optocouplers. The input signal of transistor Q11 is the driving enable signal PWM_EN, and the input signal of transistor Q12 is the driving signal ULO. After receiving the driving enable signal PWM_EN, Q11 and Q12 are turned on, and the output signal ULO' of transistor Q12 can be output to the semiconductor switch element.

[0124] In some embodiments, the operating device 540 may be a toggle switch, which can output an on signal when it is toggled to a position corresponding to the on state, and can output an off signal when it is toggled to a position corresponding to the off state. In other embodiments, the operating device 540 may be a touch switch, and when the power tool 500 is switched from the off state to the on state, the touch switch is pressed, and the switch contacts briefly contact and then separate. In this case, the jump signal generated is the on signal. For example, the on signal can be a jump signal from high voltage to low voltage. When the power tool 100 is switched from the on state to the off state, the touch switch is pressed again, and the switch contacts briefly contact and then separate. In this case, the jump signal generated is the off signal. During other time periods, the touch switch is not pressed, the switch contacts are not in contact, and a stable non-jump signal can be continuously output to the outside. For example, a high voltage signal can be continuously output.

[0125] In the electric tool 500 described in Figures 13 to 15, the normal operation of the driving motor requires both a driving signal provided by the first controller for control and a driving enable signal provided by the second controller for enabling. Both controllers respond to the start signal to output a signal. No matter which of the two controllers fails, the motor cannot be driven to operate, thereby providing double protection for the normal operation of the motor, preventing the problem of accidental startup, and improving the safety of the tool and the user experience.

[0126] In some embodiments, the first controller 550 may also be configured to stop outputting a drive signal to the drive device 530 upon receiving a shutdown signal from the operating device 540. The drive device 530 will not be able to drive the motor 510 to operate after losing the drive signal, and the motor 510 will therefore stop rotating. In other embodiments, in addition to the first controller 550 stopping outputting a drive signal to the drive device 530, the second controller 560 may also be configured to stop outputting a drive enable signal to the drive device 530 upon receiving a shutdown signal from the operating device 540. The drive device 530 will not be able to drive the motor 510 to operate after losing the drive signal and the drive enable signal, and the motor 510 will therefore stop rotating. In this embodiment, both controllers stop outputting signals in response to the shutdown signal, and in the absence of a fault in the dual controllers, the motors can be ensured to stop smoothly.

[0127] Referring to FIG16 , FIG16 is a schematic diagram of the electrical control circuit of an electric tool 600 as another embodiment of the present application. The electric tool 600 includes a motor 610, a power management device 620, a drive device 630, an operating device 640, and a first controller 650 and a second controller 660. The electric tool 600 may partially or entirely reference the component structure and configuration of the motor 510, power management device 520, drive device 530, operating device 540, and first controller 550 and second controller 560 in the electric tool 500 as required. Based on the electric tool 500, the difference between the electric tool 600 and the electric tool 500 is at least that the power supply to the first controller 650 in the electric tool 600 is provided by the power management device 620, the power supply process of the power management device 620 is controlled by the first controller 650, and the electric tool 600 can implement a delayed shutdown function.

[0128] In the power tool 600, the power management device 620 is connected to the operating device 640 and the first controller 650. The power management device 620 is capable of receiving a start signal from the operating device 640 and can be configured to output a first enable signal to the first controller 650 upon receiving the start signal from the operating device 640, thereby powering the first controller 650. The first enable signal is a power supply signal for the first controller 650 and can be a voltage signal that meets its voltage requirements. In some embodiments, the power management device 620 is also connected to the second controller 660. Upon receiving the start signal, in addition to outputting the first enable signal to the first controller 650, it can also be configured to output a second enable signal to the second controller 660 to power the second controller 660. The second enable signal is a power supply signal for the second controller 660 and can be a voltage signal that meets its voltage requirements. The voltage values ​​of the first enable signal and the second enable signal can be the same or different. For example, the first enable signal can be a 12V voltage signal and the second enable signal can be a 3.3V signal. It is understandable that in other embodiments, the power supply logics of the first controller 650 and the second controller 660 may also be independent of each other.

[0129] The first controller 650 may also be configured to output a first power-off signal to the power supply management device 620 after waiting for the sixth preset time period T6 upon receiving a shutdown signal from the operating device 640. The first power-off signal may be a voltage signal. In some embodiments, the first controller 650 may also be configured to output a first power-off signal to the power supply management device 620 upon receiving a shutdown signal from the operating device 640, that is, the sixth preset time period is zero. The power supply management device 620 may be configured to stop outputting the first enable signal to the first controller 650 upon receiving the first power-off signal. In some embodiments, upon receiving the first power-off signal, in addition to stopping outputting the first enable signal to the first controller 650, the power supply management device 620 may also be configured to stop outputting the second enable signal to the second controller 660. It is understandable that in other embodiments, the power-off logic of the first controller 650 and the second controller 660 may also be independent of each other.

[0130] The following is a more detailed description of each device in the power tool 600 shown in FIG. 16 .

[0131] In some embodiments, the operating device 640 is a touch switch, and the switch contacts separate after a brief contact, and cannot form a continuous circuit loop. Therefore, the power supply management device 620 cannot obtain a continuous start signal, and may lose power after power is turned on as the start signal is lost, and can only provide power to the outside for a short time. In order to enable the power supply management device 620 to continue to supply power to the outside after power is turned on, the first controller 650 can also be configured to output a maintenance signal to the power supply management device 620 when it receives the start signal from the operating device 640, so that the power supply management device 620 can continue to supply power to the outside when the start signal is lost. The maintenance signal can be a voltage signal. The power supply management device 620 can be configured to continue to output the first enable signal to the first controller 650 when it loses the start signal from the operating device 640 but receives the maintenance signal from the first controller 650. In some embodiments, it also continues to output the second enable signal to the second controller 660.

[0132] The first controller 650 can also be configured to stop outputting the maintain signal to the power management device 620 upon receiving a shutdown signal from the operating device 640, thereby preventing the power management device 620 from supplying power. The power management device 620 can also be configured to stop outputting the first enable signal to the first controller 650 upon losing both the start signal and the maintain signal. In some embodiments, the first controller 650 can also stop outputting the second enable signal to the second controller 660. In this case, the first controller 650 ceasing to output the maintain signal to the power management device 620 can be considered to have outputted the first power-off signal to the power management device 620.

[0133] Referring to Figure 17, the operating device 640 is a touch switch, and part of the power supply circuit in the power supply management device 620 may include multiple transistors Q21, Q22, Q23, multiple resistors, capacitors, and voltage-stabilizing diodes. In some examples, the transistors Q21, Q22, and Q23 in the power supply circuit may also be replaced by other semiconductor components such as optocouplers. The input signal of transistor Q23 may be connected to the maintenance signal Powerkeep from the first controller 650. When the switch contacts in the operating device 640 touch, transistor Q21 is short-circuited and transistor Q22 is turned on. The power supply management device 620 is successfully powered on, and Q22 generates an output signal, which can be used as a first enable signal after voltage conversion and other processing. In some embodiments, it can also be used as a second enable signal. After the switch contacts in the operating device 640 are separated, Q21 is no longer conductive and Q22 is also not conductive. In order to enable the power management device 620 to maintain the power supply state, the first controller 650 receives the start signal and outputs the maintenance signal Powerkeep. The maintenance signal Powekeep will turn on Q23, and the output signal of Q23 can make Q21 and Q22 continue to be conductive, and Q22 can continue to output signals. The first enable signal can thus continue to be output to the first controller 650. In some embodiments, the second enable signal also continues to be output to the second controller 660.

[0134] When the first controller 650 does not fail, after receiving the shutdown signal and waiting for the sixth preset time period T6, the first controller 650 no longer outputs the maintenance signal Powerkeep, Q23 is no longer turned on, Q21 and Q22 are no longer turned on, Q22 no longer outputs a signal, and the first enable signal output to the first controller 650 is interrupted. In some embodiments, the second enable signal output to the second controller 660 is also interrupted.

[0135] In the power tool 600 depicted in Figures 16 and 17 , the power sources for the first and second controllers are generated by an enable signal output from the power management device. Upon receiving a shutdown signal, the first controller will wait for a preset period of time before attempting to interrupt the power supply from the power management device. Assuming the first controller is not faulty, the power tool can safely achieve delayed shutdown. In standby mode (where the motor is stopped but the entire tool remains powered on), the dual controllers can quickly respond to user actions or control auxiliary functions such as lighting and display until the tool is finally shut down.

[0136] Referring to FIG. 18 , FIG. 18 is a schematic diagram of the electrical control circuitry of an electric tool 700 as another embodiment of the present application. In addition to a motor 710, a power management device 720, a drive device 730, an operating device 740, and first and second controllers 750 and 760, electric tool 700 also includes a parameter detection device 770. Electric tool 700 can partially or fully reference the component configuration and configuration of motor 610, power management device 620, drive device 630, operating device 640, and first and second controllers 650 and 660 in electric tool 600 as needed. Based on electric tool 600, electric tool 700 differs from electric tool 600 in at least one aspect: the power supply process of the power management device 720 in electric tool 700 is controlled not only by the first controller 750 but also by the second controller 760, enabling safe shutdown in the event of a failure of the first controller 750.

[0137] In the power tool 700, a parameter detection device 770 is connected to the motor 710 and the second controller 760. The parameter detection device 770 can detect motor operating parameters such as phase current, phase voltage, rotor position, and motor speed. It can be configured to detect the operating parameters of the motor 710 and transmit the operating parameters to the second controller 760. In some examples, the parameter detection device 770 can be various types of sensors.

[0138] The second controller 760 is also connected to the power supply management device 720. The second controller 760 is also configured to wait for the seventh preset time period T7 after receiving the shutdown signal from the operating device 740 to determine whether the operating parameters from the parameter detection device 770 are still in a changing state. The seventh preset time period T7 may be less than or equal to the sixth preset time period T6. After the shutdown signal is issued and the seventh preset time period T7 has passed, if the first controller 750 is not faulty, it has stopped outputting the drive signal to the drive device 730, and the drive device 730 has stopped driving the motor 710 to operate. The operating parameters of the motor 710 should be in an unchanged state. Therefore, if the second controller 760 determines that the motor operating parameters from the parameter detection device 770 are not in a changing state, it can remain silent and wait for the sixth preset time period T6 to expire before shutting down naturally.

[0139] If the motor operating parameters are changing, the first controller 750 may have a software malfunction or other issues, causing it to continue outputting drive signals to the drive device 730, which in turn may continue driving the motor 710. In this case, the second controller 760 may be configured to output a second power-off signal to the power management device 720. The second power-off signal may be a voltage signal. The power management device 720 may be configured to stop outputting the first enable signal to the first controller 750 upon receiving the second power-off signal from the second controller 760. Upon losing the first enable signal from the power management device 720, the first controller 750 will stop outputting drive signals to the drive device 730. Without the first enable signal, the drive device 730 will be unable to drive the motor 710, causing the motor 710 to stop rotating. In some embodiments, upon receiving the second power-off signal, in addition to stopping outputting the first enable signal to the first controller 750, the power management device 720 may also be configured to stop outputting the second enable signal to the second controller 760, thereby powering off the entire device.

[0140] In addition, considering that the transistors in the driving device 730 may be damaged when they receive a driving signal from the first controller 750 but do not receive a driving enable signal from the second controller 760, in some embodiments, the second controller 760 may not stop outputting the driving enable signal when receiving a shutdown signal, but may be configured to stop outputting the driving enable signal to the driving device 730 after receiving the shutdown signal and experiencing the seventh preset time length T7, thereby avoiding the above-mentioned problem of transistor damage.

[0141] The following is a more detailed description of each device in the power tool 700 shown in FIG. 18 .

[0142] Referring to Figure 19, in some embodiments, the operating device 740 is a touch switch, and part of the power supply circuit in the power supply management device 720 may include multiple transistors Q31, Q32, Q33, multiple resistors, capacitors, and voltage-stabilizing diodes. In some examples, the transistors Q31, Q32, and Q33 in the drive circuit may also be replaced by other semiconductor components such as optocouplers. Among them, the input signal of the transistor Q31 can be connected to the second power-off signal Poweroff from the second controller 760, and the input signal of the transistor Q33 can be connected to the maintenance signal Powerkeep from the first controller 750. When the power tool 700 is in the on state, the maintenance signal Powekeep output by the first controller 750 turns on Q33, and Q31 and Q32 are also turned on. The signal output by Q32 is used as the first enable signal after voltage conversion and other processing.

[0143] In the event of a malfunction in the first controller 750, the first controller 750 is unable to stop outputting the drive signal upon receiving the shutdown signal. The drive device 730 continues to drive the motor 710, and the parameter detection device 770 transmits the changed motor operating parameters to the second controller 760. After receiving the shutdown signal for the seventh predetermined duration T7, the second controller 760 determines that the current motor operating parameters are in a changed state and outputs a second power-off signal, Poweroff. This second power-off signal, Poweroff, disconnects Q21 and Q22, causing Q22 to no longer output a signal. This interrupts the first enable signal to the first controller 750. Due to the loss of power, the first controller 750 is unable to output a drive signal to the drive device 730. Consequently, the drive device 730 stops driving the motor 710, causing the motor 710 to stop rotating. In some embodiments, Q22 no longer outputs a signal, interrupting the second enable signal to the second controller 760 and causing the entire device to lose power.

[0144] In the electric tool 700 described in Figures 18 and 19, the second controller confirms whether the motor is still running through the status of the motor operating parameters, that is, confirms whether the first controller is faulty, and tries to interrupt the power supply from the power supply management device to the first controller when the parameters change (first controller fails), so that the first controller loses power and stops outputting the drive signal, so that when the first controller fails, the motor can be smoothly stopped or further shut down. As long as one of the dual controllers can still work normally, the problem of being unable to shut down will not occur, thereby improving the safety of the tool and the user experience.

[0145] Figure 20 shows a flow chart of a control method for an electric tool as an embodiment of the present application. The control method shown in Figure 20 can be applied to the electric tool described above.

[0146] The control method of the electric tool may include the following specific steps:

[0147] S2002, when the electric tool is switched to the on state, the operating device outputs an on signal to the first controller and the second controller;

[0148] S2004, when receiving the start signal, the first controller outputs a driving signal to the driving device;

[0149] S2006, when the second controller receives the start signal, it outputs a drive enable signal to the drive device;

[0150] S2008 , when the driving device receives the driving signal and the driving enable signal, the driving motor is driven to operate.

[0151] The above shows and describes 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 form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. An electric tool comprising: Motor; a power management device, comprising a power source and arranged to supply power to at least the motor; A driving device, configured to drive the motor to operate so as to realize the main functions of the electric tool; an operating device, configured to be operated by a user to enable one or more functions of the electric tool, and output a function signal corresponding to the function enabled by the user to the power supply management device; the electric tool has the main function and at least one auxiliary function, and the function signal includes a main function signal corresponding to the main function and an auxiliary function signal corresponding to each of the auxiliary functions; Wherein, the power supply management device is further configured to output a first enable signal when receiving any of the function signals, and to output a third enable signal to the drive device when receiving the main function signal; The electric tool further comprises: a first controller connected to the power supply management device and configured to output a first drive signal to the drive device upon receiving at least the first enable signal; The driving device is further configured to drive the motor to operate when receiving the third enabling signal and the first driving signal.

2. The electric tool according to claim 1, wherein: The operating device is also configured to output the main function signal to the first controller when the user enables the main function; the first controller is also connected to the operating device and is also configured to output a first drive signal to the drive device when it receives the first enable signal and the main function signal.

3. The electric tool according to claim 1, wherein: The driving device includes a driving circuit and a driving signal generating circuit; the first controller is also configured to output the first driving signal to the driving circuit and output the second driving signal to the driving signal generating circuit when at least the first enabling signal is received; the driving signal generating circuit is configured to output the second driving signal after voltage boosting to the driving circuit when the third enabling signal and the second driving signal are received; the driving circuit is configured to drive the motor to operate when the first driving signal and the second driving signal after voltage boosting are received.

4. The electric tool according to claim 1, wherein: The electric tool further comprises: An auxiliary device, configured to implement the auxiliary function of the electric tool; A second controller connected to the operating device and to the power supply management device; The operating device is further configured to output the function signal corresponding to the function enabled by the user to the second controller; the power supply management device is further configured to, upon receiving any of the function signals, A second enable signal is output to the second controller; the second controller is configured to control the corresponding auxiliary device to operate to implement the corresponding auxiliary function when the second enable signal and the auxiliary function signal corresponding to any of the auxiliary functions are received.

5. The electric tool according to claim 4, wherein: The auxiliary function includes an interface display function, and the auxiliary device includes an interface display device corresponding to the interface display function; the second controller is also configured to light up the interface display device and turn off the interface display device after a first preset time period when receiving the second enable signal and the auxiliary function signal corresponding to the interface display function.

6. The electric tool according to claim 4, wherein: The auxiliary function includes a power display function, and the auxiliary device includes a power display device corresponding to the power display function; the second controller is also configured to light up the power display device and extinguish the power display device after a second preset time when receiving the second enable signal and the auxiliary function signal corresponding to the power display function.

7. The electric tool according to claim 4, wherein: The operating device is also configured to be operated by a user to turn off one or more functions of the electric tool, and to interrupt the output of the function signal corresponding to the function turned off by the user to the second controller and the power supply management device.

8. The electric tool according to claim 7, wherein: The second controller is also configured to output a first maintenance signal to the power supply management device and interrupt the transmission of the first maintenance signal after a third preset time period when the main function signal is lost; the power supply management device is also configured to interrupt the output of the third enable signal to the driving device when the main function signal and the first maintenance signal are lost.

9. The electric tool according to claim 8, wherein: The second controller is further configured to output a second maintenance signal to the power supply management device and interrupt the transmission of the second maintenance signal after a fourth preset time period when all the functional signals are lost; the fourth preset time period is greater than or equal to the third preset time period; The power supply management device is further configured to interrupt outputting the first enable signal to the first controller when all the function signals and the second maintenance signal are lost.

10. The electric tool according to claim 9, wherein: The second controller is also configured to output a third maintenance signal to the power supply management device and interrupt the transmission of the third maintenance signal after a fifth preset time period when all the functional signals are lost; the fifth preset time period is greater than or equal to the fourth preset time period; the power supply management device is also configured to interrupt the output of the second enable signal to the second controller when all the functional signals and the third maintenance signal are lost.

11. An electric tool comprising: Motor; a power management device, comprising a power source and arranged to supply power to at least the motor; A driving device, configured to drive the motor to operate so as to realize the main functions of the electric tool; an operating device, configured to be operated by a user to enable the main function, and output a main function signal corresponding to the main function to the power supply management device; Wherein, the power supply management device is further configured to output a first enable signal and output a third enable signal to the driving device when receiving the main function signal; The electric tool further comprises: a first controller connected to the power supply management device and configured to output a first drive signal to the drive device upon receiving at least the first enable signal; The driving device is further configured to drive the motor to operate when receiving the third enabling signal and the first driving signal.

12. An electric tool comprising: Motor; a power management device, comprising a power source and configured to supply power to at least the motor; A driving device, configured to drive the motor to operate; An operating device, configured to be operated by a user to switch the on / off state of the electric tool and output a corresponding on signal or off signal; Wherein, the electric tool further comprises: A first controller connected to the operating device and the driving device, and configured to output a driving signal to the driving device when receiving the start signal; A second controller is connected to the operating device and the driving device, and is configured to output a driving enable signal to the driving device when receiving the start signal; The driving device is further configured to drive the motor to operate when receiving the driving signal and the driving enable signal.

13. The electric tool according to claim 12, wherein: The first controller is further configured to stop outputting the driving signal to the driving device upon receiving the shutdown signal.

14. The electric tool according to claim 12, wherein: The power supply management device is connected to the first controller, and is further configured to output a first enable signal to the first controller when receiving the start signal.

15. The electric power tool according to claim 14, wherein: The first controller is also configured to output a first power-off signal to the power supply management device after waiting for a sixth preset time period when receiving the shutdown signal; the power supply management device is also configured to stop outputting the first enable signal to the first controller when receiving the first power-off signal.

16. The electric power tool according to claim 14, wherein: The first controller is further configured to output a maintenance signal to the power supply management device when receiving the start signal; the power supply management device is further configured to continue to output the first enable signal to the first controller when losing the start signal and receiving the maintenance signal.

17. The electric tool according to claim 16, wherein: The first controller is also configured to stop outputting the maintenance signal to the power supply management device after waiting for a sixth preset time period when receiving the shutdown signal; the power supply management device is also configured to stop outputting the first enable signal to the first controller when losing the maintenance signal.

18. The electric tool according to claim 15 or 17, wherein: The electric tool also includes: a parameter detection device, which is connected to the motor and the second controller and is configured to detect the operating parameters of the motor and transmit the operating parameters of the motor to the second controller; the second controller is also configured to output a second power-off signal to the power supply management device after receiving the shutdown signal and after a seventh preset time period, when the operating parameters are still in a changing state; the power supply management device is also configured to stop outputting the first enable signal to the first controller when receiving the second power-off signal.

19. The electric tool according to claim 18, wherein: The second controller is also configured to stop outputting the drive enable signal to the drive device after receiving the shutdown signal and a seventh preset time period has elapsed.

20. The electric power tool according to claim 18, wherein: The first controller is also configured to stop outputting the driving signal to the driving device when the first enabling signal is lost.

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