Hand-propelled power tool

Abstract

The application discloses a hand-push electric tool, which comprises a main body, a push rod assembly connected with the main body, a main control module and a first power supply arranged on the main body, and a user control module arranged on the push rod assembly; the first power supply is electrically connected with the main control module; the hand-push electric tool further comprises a second power supply and a plurality of charging interfaces; the second power supply is arranged on the push rod assembly and is electrically connected with the user control module to supply power for the user control module; the plurality of charging interfaces are electrically connected with the second power supply to form a charging path for the second power supply. Thus, the technical scheme of the application configures the second power supply of the user control module in the hand-push electric tool with a plurality of charging interfaces to adapt to a plurality of chargers, so that the limitation of a single charging mode can be broken, and the second power supply of the user control module in the hand-push electric tool can be charged by flexibly selecting the chargers.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and in particular to a push-type power tool. Background Technology

[0002] With the improvement of people's living standards, hand-operated power tools are widely used in daily life (for example, lawnmowers are widely used in homes, parks, golf courses, etc.). The push rod assembly of hand-operated power tools is usually equipped with a user control module, and when the user control module has an independent power supply, the power supply of the user control module needs to be charged.

[0003] Currently, the power supply for the user control module in push-type power tools generally uses a dedicated charging interface or a single charging interface, requiring users to rely on a specific charger. This design has the following problems: (1) the charger is inconvenient to carry, and in outdoor work scenarios, the charger is easily lost or damaged, resulting in the inability to charge; (2) the dedicated interface is incompatible with chargers for other electronic devices, making it difficult to quickly obtain alternative charging solutions in emergencies. Therefore, how to flexibly select a charger to charge the power supply for the user control module in push-type power tools is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a push-type power tool that is equipped with multiple charging interfaces for the power supply of the user control module, so as to flexibly select a charger to charge the power supply of the user control module in the push-type power tool and improve the user experience.

[0005] To achieve the above objectives:

[0006] This application provides a push-type power tool, including a main body, a push rod assembly connected to the main body, a main control module and a first power supply disposed on the main body, and a user control module disposed on the push rod assembly. The first power supply is electrically connected to the main control module. The push-type power tool also includes a second power supply and multiple charging interfaces. The second power supply is disposed on the push rod assembly and is electrically connected to the user control module to supply power to the user control module. The multiple charging interfaces are all electrically connected to the second power supply to form a charging path for charging the second power supply.

[0007] In one embodiment, the charging interface is the same as that used in portable terminals.

[0008] In one embodiment, the various charging interfaces include a Micro USB interface, a Type C interface, a Lightning interface, and / or a hollow cylindrical plug.

[0009] In one embodiment, the system further includes a second control unit and a charging management circuit; multiple charging interfaces are connected to a second power supply through the charging management circuit to form a charging path; the charging management circuit is also connected to the second control unit and is used to feed back an access signal to the second control unit when a charger is connected to a charging interface, and / or detect an electrical signal corresponding to the second power supply, and output a charging feedback signal to the second control unit based on the electrical signal; the second control unit is used to control the charging management circuit to start charging when it determines the charging demand based on its own voltage, so as to charge the second power supply through the charging path; and / or, to control the charging management circuit to stop charging when it determines that the battery is fully charged based on the charging feedback signal.

[0010] In one embodiment, the charging management circuit includes a charging management chip, a switching transistor, and / or a temperature sensing unit. The charging management chip includes a first access pin, a charging output pin, a battery detection pin, a first signal output pin, and / or a temperature sensing pin. The first access pin of the charging management chip is connected to a charging interface. The charging output pin of the charging management chip is connected to a second power supply through the path terminal of the switching transistor. The control terminal of the switching transistor is connected to a second control unit, which controls its conduction or deactivation to support the charging management circuit in starting or ending charging. The battery detection pin of the charging management chip is connected to the path terminal of the switching transistor to detect an electrical signal corresponding to the second power supply. The first signal output pin of the charging management chip is connected to the second control unit to determine a charging feedback signal based on the electrical signal and output the charging feedback signal to the second control unit, so that the second control unit controls the switching transistor to turn off when it is fully charged based on the charging feedback signal. The temperature sensing pin of the charging management chip is connected to a temperature sensing unit to receive a temperature sensing signal fed back by the temperature sensing unit, so that the charging management chip adjusts the charging parameters according to the temperature sensing signal and the charging output pin charges the second power supply according to the charging parameters.

[0011] In one embodiment, the temperature sensing unit includes a thermistor and a grounding resistor; one end of the thermistor is connected to the charging interface, the other end of the thermistor is grounded through the grounding resistor, and the other end of the thermistor is also connected to the temperature sensing pin of the charging management chip, and the temperature sensing pin is used to receive the voltage signal of the other end of the thermistor as a temperature sensing signal; wherein, the thermistor is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.

[0012] In one embodiment, a photoelectric conversion panel is also included; the charging management chip in the charging management circuit further includes a second access pin and a second signal output pin. The second access pin and the second signal output pin are connected to the photoelectric conversion panel, and the charging management chip is used to output a control signal to the charging switch of the photoelectric conversion panel through the second signal output pin when the charging interface connected to the first access pin is connected to a charger, so as to turn off the charging switch of the photoelectric conversion panel and cut off the power input of the photoelectric conversion panel to the second access pin.

[0013] In one embodiment, the push-type power tool further includes a fast-charging chip connected between the charging management circuit and the charging interface; and / or, the push-type power tool further includes a front-end sampling module and a battery indicator module connected to the second control unit, the front-end sampling module being used to sample the second power supply to obtain and send battery information to the second control unit, the control unit being used to control the display of the battery indicator module according to the battery information; and / or, the push-type power tool further includes a temperature detection module and a heat dissipation device connected to the second control unit, the temperature detection module being used to detect the temperature of the user control module and / or the temperature of the second power supply, the second control unit being used to control the heat dissipation efficiency of the heat dissipation device according to the temperature of the user control module and / or the temperature of the second power supply.

[0014] In one embodiment, the charging management circuit further includes a filter circuit connected in parallel with the second power supply, wherein the filter circuit includes a combination of electrolytic capacitors and ceramic capacitors connected in parallel.

[0015] In one embodiment, the electrolytic capacitor and the ceramic capacitor are positioned close to the charging interface.

[0016] In one embodiment, the electrolytic capacitors and / or ceramic capacitors in the filter circuit are grounded via copper foil.

[0017] In one embodiment, the push-type power tool is a lawnmower or a snowplow.

[0018] The push-type power tool provided in this application includes a main body, a push rod assembly connected to the main body, a main control module and a first power supply disposed on the main body, and a user control module disposed on the push rod assembly. The first power supply is electrically connected to the main control module. The push-type power tool also includes a second power supply and multiple charging interfaces. The second power supply is disposed on the push rod assembly and is electrically connected to the user control module to supply power to the user control module. The multiple charging interfaces are all electrically connected to the second power supply to form a charging path for charging the second power supply. Thus, the technical solution of this application configures multiple charging interfaces for the second power supply of the user control module in the push-type power tool to adapt to multiple chargers. This breaks through the limitation of a single charging mode and enables flexible selection of chargers to charge the second power supply of the user control module in the push-type power tool. This improves the convenience of obtaining chargers, reduces the factory configuration cost or after-sales purchase cost of dedicated chargers, and better ensures that the push-type power tool can work in more environments. Therefore, it can improve the user experience of the push-type power tool. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] Figure 1 This is a first frame structure diagram of the user control module and peripheral components as exemplified in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of a push-type power tool, an example of an embodiment of this application.

[0022] Figure 3 This is a structural diagram of the control system of a hand-operated power tool, as exemplified in an embodiment of this application.

[0023] Figure 4 This is a first frame structure diagram of a charging management circuit exemplified in an embodiment of this application.

[0024] Figure 5 This is a charging logic diagram of the second power supply as exemplified in an embodiment of this application.

[0025] Figure 6 This is a second frame structure diagram of the charging management circuit exemplified in the embodiments of this application.

[0026] Figure 7This is a third frame structure diagram of the charging management circuit exemplified in the embodiments of this application.

[0027] Figure 8 This is a second frame structure diagram of the user control module and peripheral components as exemplified in the embodiments of this application.

[0028] Figure 9 This is a flowchart illustrating the communication principle of the fast charging protocol exemplified in this application.

[0029] Figure 10 This is a third frame structure diagram of the second frame structure diagram of the user control module and peripheral components in the embodiments of this application.

[0030] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0033] It should be understood that although the terms first, second, third, etc., may be used herein to describe various components or modules, these components or modules should not be limited to these terms. These terms are used only to distinguish components or modules of the same type from one another. For example, without departing from the scope of this document, a first component or module may also be referred to as a second component or module, and similarly, a second component or module may also be referred to as a first component or module. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms, unless the context indicates otherwise. It should be further understood that the terms “comprising” or “including” indicate the presence of the stated feature, operation, component, or module, but do not exclude the presence, occurrence, or addition of one or more other features, operations, components, or modules. The terms “or” and “and / or” as used herein are to be interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C.” An exception to this definition will only occur if a combination of components, modules, functions, or operations is inherently mutually exclusive in some way.

[0034] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0035] First Embodiment

[0036] See Figures 1 to 3 The first embodiment of this application provides a push-type power tool, including a main body 1 (e.g., chassis), a push rod assembly 2 connected to the main body 1, a main control module 3 and a first power supply 15 disposed on the main body 1, a user control module 4 disposed on the push rod assembly 2, a second power supply 45 and various charging interfaces 47.

[0037] The first power supply 15 is electrically connected to the main control module 3.

[0038] The second power supply 45 is disposed on the push rod assembly 2 and is electrically connected to the user control module 4 to supply power to the user control module 4.

[0039] Among them, multiple charging interfaces 47 are electrically connected to the second power supply 45 to form a charging path for charging the second power supply 45.

[0040] In one embodiment, the main body 1 may also include various core components or functional units that perform specific work tasks, such as a walking drive motor 12 and a work drive motor 14.

[0041] In one embodiment, the main body 1 is provided with a walking component 11 for supporting the main body 1, a walking drive motor 12 for driving the walking component 11 to rotate, a workpiece for performing tasks, and a work drive motor 14 for driving the workpiece to rotate. The walking component 11 specifically includes rollers. The main body 1 serves as the main support structure of the push-type power tool, assembling all parts into one unit. The walking component 11 can rotate relative to the main body 1, thereby allowing the main body 1 to move on the ground. The walking drive motor 12 is connected to the walking component 11 through a transmission mechanism (not shown), thereby driving the walking component 11 to rotate through the transmission mechanism. The work drive motor 14 is used to drive the workpiece to rotate in order to perform tasks (such as mowing lawns, snowplowing, etc.).

[0042] In one embodiment, the push-type power tool is, for example, a lawnmower or a snowplow. Exemplarily, when the push-type power tool is a lawnmower, the working component includes a mowing blade disposed at the bottom of the main body 1, and a drive motor 14 drives the mowing blade to rotate for mowing. A grass collection box (not labeled) is provided at the rear of the main body 1 to collect the grass cut by the mowing blade. Exemplarily, when the push-type power tool is a snowplow, the working component can be replaced with a snowplow component, etc.

[0043] In one embodiment, the push rod assembly 2 is used for the user to push the push-type power tool.

[0044] In one embodiment, the push rod assembly 2 is rotatably connected to the main body 1, and the push rod assembly 2 is telescopic, thereby enabling the push rod assembly 2 to have folding and telescopic storage functions. When the push rod assembly 2 rotates relative to the main body 1, the push rod assembly 2 has a folded state (the folded state is not shown in the figure) and an unfolded state (i.e., as shown in the figure). Figure 2 The push-type power tool can switch between two states (as shown in the diagram). For example, when the push-type power tool is in working state, the push rod assembly 2 rotates backward relative to the main body 1 and is in an unfolded state. At this time, the push rod assembly 2 is located behind the main body 1, and the angle between the push rod assembly 2 and the main body 1 is greater than 90° and less than 180° (that is, the angle between the push rod assembly 2 and the horizontal direction is greater than 90° and less than 180°). At this time, the user can push the push-type power tool to move by pushing the push rod assembly 2, and at the same time, the user can control the operation of the push-type power tool by operating the main control module 4. When the push-type power tool is not in working state, the push rod assembly 2 rotates forward relative to the main body 1 and is in a folded state. At this time, the push rod assembly 2 is close to the main body 1, thereby saving space occupied by the device and making it easy to store.

[0045] In one embodiment, the push rod assembly 2 includes a lower push rod 21 and an upper push rod 22 arranged in parallel, with the lower push rod 21 and upper push rod 22 respectively located on the left and right sides of the main body 1. One end of the lower push rod 21 is rotatably connected to the main body 1, and the other end of the lower push rod 21 is retractably connected to one end of the upper push rod 22. Specifically, both the lower push rod 21 and the upper push rod 22 are hollow tubular structures, with the upper push rod 22 sleeved inside the lower push rod 21, and the upper push rod 22 can be retracted and stored inside the lower push rod 21. The user control module 4 is installed at the end of the upper push rod 22 away from the lower push rod 21, and the left and right ends of the user control module 4 are respectively connected to the upper push rods 22 on the left and right sides. The push rod assembly 2 also includes a handle 24, which is connected to the end of the upper push rod 22 away from the lower push rod 21. The handle 24 is used for the user to hold and push the push-type power tool. A telescopic control assembly 23 is provided at the connection between the lower push rod 21 and the upper push rod 22. The left and right ends of the telescopic control assembly 23 are respectively connected to the lower push rods 21 on the left and right sides. The telescopic control assembly 23 is used to control the relative telescopic movement of the upper push rod 22 and the lower push rod 21. That is, the telescopic control assembly 23 can lock the upper push rod 22 and the lower push rod 21 so that the push rod assembly 2 remains in the extended or retracted state.

[0046] The telescopic control component 23 includes a telescopic detection switch 231, which is electrically connected to the second control unit 41. The telescopic detection switch 231 is used to detect the telescopic state of the push rod assembly 2. When the push rod assembly 2 is in the retracted state or in a state between extension and retraction, the hand-operated power tool cannot move or work (i.e., the first control unit 31 does not allow the walking drive motor 12 and the working drive motor 14 to operate). When the push rod assembly 2 is in the extended state, the hand-operated power tool can move and work (i.e., the second control unit 31 allows the walking drive motor 12 and the working drive motor 14 to operate) to ensure safety.

[0047] A folding detection switch 16 is provided at the connection between the lower push rod 21 and the main body 1. The folding detection switch 16 is electrically connected to the first control unit 31 and is used to detect the folding state of the push rod assembly 2. When the push rod assembly 2 is in a folded state or in a state between folding and unfolding, the hand-operated power tool cannot move or work (i.e., the first control unit 31 does not allow the walking drive motor 12 and the working drive motor 14 to operate). When the push rod assembly 2 is in an unfolded state, the hand-operated power tool can move and work (i.e., the first control unit 31 allows the walking drive motor 12 and the working drive motor 14 to operate) to ensure safety. For the specific structure and working principle of the push rod assembly 2, the telescopic control assembly 23, the telescopic detection switch 231, and the folding detection switch 16, please refer to the applicant's previous patent applications (such as CN113875399B, CN114365616B, etc.), which will not be elaborated here.

[0048] In one embodiment, the user control module 4 is used for user operation.

[0049] In one embodiment, the user control module 4 includes a second control unit 41, and the main control module 3 includes a first control unit 31; in this embodiment, both the first control unit 31 and the second control unit 41 are MCUs (Microcontroller Units).

[0050] In one embodiment, the first control unit 31 is electrically connected to the walking drive motor 12 and the working drive motor 14, respectively.

[0051] In one embodiment, the first control unit 31 and the second control unit 41 can communicate with each other, that is, the user control module 4 and the main control module 3 can communicate with each other (e.g., the user control module 4 communicates with the second communication unit 52 of the main control module through the first communication unit 51), thereby enabling the user control module 4 to control the components on the main body. The communication between the first communication unit 51 and the second communication unit 52 can be wired or wireless.

[0052] In one embodiment, the first communication unit 51 of the user control module 4 can also establish a wireless communication connection with an external terminal device 8 (such as a mobile phone, computer, etc.), so that the external terminal device 8 can realize remote control, remote signaling, etc. of the push-type power tool.

[0053] In one embodiment, the user control module 4 further includes interactive controls, including a walking motor switch 43 and a working motor switch 44, both of which are electrically connected to the second control unit 41. The walking motor switch 43 is operated by the user to control the operation of the walking drive motor 12 (the walking motor switch 43 can control the start / stop and working gear of the walking drive motor 12, etc.); the working motor switch 44 is operated by the user to control the operation of the working drive motor 14 (the working motor switch 44 can control the start / stop and working gear of the working drive motor 14, etc.). Optionally, the main control module 3 further includes a first control circuit 32 and a second control circuit 33 (both the first control circuit 32 and the second control circuit 33 include various electronic devices, such as resistors, inductors, and switching elements). The second control unit 31 is electrically connected to the walking drive motor 12 through the first control circuit 32, and the second control unit 31 is electrically connected to the working drive motor 14 through the second control circuit 33. Of course, the interactive controls also include other control elements, which will not be described in detail here.

[0054] In one embodiment, the user control module 4 further includes a housing 46, which is connected to the push rod assembly 2 (specifically, the left and right ends of the housing 46 are respectively connected to the upper push rods 22 on the left and right sides). The first control unit 41 and the second power supply 45 are both disposed within the housing 46. Of course, the second power supply 45 can also be directly disposed on the body of the push rod assembly 2 or disposed on other components of the push rod assembly 2 (for example, a battery compartment can be additionally provided on the push rod assembly 2, and the second power supply 45 can be disposed within the battery compartment).

[0055] For example, the first circuit board in the user control module 4 is disposed inside the housing 46, the second power supply 45 is electrically connected to the first circuit board, and other components in the user control module 4 are also electrically connected to the first circuit board, so that the second power supply 45 supplies power to the user control module 4 through the first circuit board.

[0056] In one embodiment, the user control module 4 is detachably connected to the push rod assembly 2. When the hand-operated power tool is in operation, the user can detach the user control module 4 from the push rod assembly 2 to remotely control the operation of the hand-operated power tool through the user control module 4.

[0057] In one embodiment, the capacity of the first power supply 15 is greater than the capacity of the second power supply 45. The first power supply 15 is generally a large battery (specifically, a large battery pack), while the second power supply 45 is generally a small battery; that is, the volume, capacity, and supply voltage of the first power supply 15 are generally greater than those of the second power supply 45. The second power supply 45 can specifically be a button cell battery, a pouch cell battery, a cylindrical battery, etc. The second power supply 45 is generally a rechargeable battery.

[0058] In one embodiment, the first power supply 15 can also supply power to other components on the main body 1, such as the walking drive motor 12, the working drive motor 14, the lighting module, etc. on the main body 1.

[0059] In one embodiment, the second power supply 45 can independently power the user control module 4, thus eliminating the need to use the first power supply 15 to power the user control module 4. Therefore, there is no need to install a power line between the main control module 3 and the user control module 4, thereby reducing the use of wiring harnesses, saving wiring harness costs, reducing assembly difficulty, reducing the risks inherent in the wiring harnesses, improving the safety and reliability of use, and enhancing the aesthetics of the equipment.

[0060] In one embodiment, the second power supply 45 is disposed on the user control module 4.

[0061] In one embodiment, the second power supply 45 is non-detachably connected to the user control module 4 (i.e., the second power supply 45 cannot be directly removed from the user control module 4; for example, the second power supply 45 is an embedded battery embedded in the housing 46).

[0062] In another embodiment, the second power supply 45 is detachably connected to the user control module 4. For example, a battery compartment is provided inside the housing 46, and the second power supply 45 is disposed inside the battery compartment. A cover plate is provided on the housing 46 to seal the battery compartment, and the cover plate is detachably connected to the housing 46. When the cover plate is opened or removed, the second power supply 45 can be removed from the battery compartment. In this case, the push-type power tool also includes a charger (not shown), which is generally a separately configured charger used to connect the second power supply 45 to an external power source to charge the second power supply 45. During charging, the second power supply 45 is first removed from the user control module 4, and then the charger is used to charge the second power supply 45.

[0063] In one embodiment, the charging interface 47 is the same as the charging interface used by portable terminals (e.g., mobile phones, laptops, iPads, etc.). Optionally, various charging interfaces include, but are not limited to, Micro USB interfaces, Type-C interfaces, Lightning interfaces, and / or hollow post plugs. Figure 1 (Not shown). Among them, the USB Type-C interface and the Lightning interface cover the charger interfaces of both Android and iOS systems, which can cover the charger models commonly used by users at home and abroad. Meanwhile, the Micro USB interface is often used for older mobile phone chargers, covering the charger models of users of different ages.

[0064] In one embodiment, the push-type power tool may further include a charging management circuit 48. The charging management circuit 48 may be connected between the charging interface 47 and the second power supply 45 to implement charging control and / or charging protection. Optionally, the charging management circuit 48 may also be connected to a second control unit 41, so that the first control unit 41 can collect relevant information or data from the charging management circuit 48, and / or the first control unit 41 can control the charging management circuit 48 to implement charging control and / or charging protection.

[0065] Through the aforementioned technical solution, the second power supply 45 of the user control module 4 in the push-type power tool is equipped with multiple charging interfaces 47 to adapt to multiple chargers, which can break through the limitation of a single charging mode and realize the flexible selection of chargers to charge the second power supply 45 of the user control module 4 in the push-type power tool. This can improve the convenience of obtaining chargers and reduce the factory configuration cost or after-sales purchase cost of dedicated chargers.

[0066] Furthermore, at least some of the various charging interfaces 47 are the same as the charging interfaces used by the portable terminal. Thus, the technical solution of this embodiment enables users to charge the second power supply 45 of the user control module 4 with the most readily available portable terminal charger without having to purchase a separate dedicated charger.

[0067] First Embodiment

[0068] See Figures 1 to 10 The first embodiment of this application provides a push-type power tool, including a main body 1 (e.g., chassis), a push rod assembly 2 connected to the main body 1, a main control module 3 and a first power supply 15 disposed on the main body 1, a user control module 4 disposed on the push rod assembly 2, a second power supply 45, multiple charging interfaces 47 and a charging management circuit 48.

[0069] The first power supply 15 is electrically connected to the main control module 3.

[0070] The second power supply 45 is disposed on the push rod assembly 2 and is electrically connected to the user control module 4 to supply power to the user control module 4.

[0071] Among them, multiple charging interfaces 47 are electrically connected to the second power supply 45 to form a charging path for charging the second power supply 45.

[0072] The charging management circuit 48 is connected between the charging interface 47 and the second power supply 45 to implement charging control and / or charging protection. It should be understood that multiple charging interfaces 47 can be connected to the second power supply 45 through the charging management circuit to form a charging path.

[0073] In one embodiment, the user control module 4 includes a second control unit 41, and the second control unit 41 may be a microcontroller.

[0074] In one embodiment, see Figure 1 The charging management circuit 48 can also be connected to the second control unit 41, so that the first control unit 41 can collect relevant information or data from the charging management circuit 48, and / or the first control unit 41 can control the charging management circuit 48 to realize charging control and / or charging protection.

[0075] For example, the charging management circuit 48 is connected to the aforementioned second control unit 41 and is used to feed back an access signal to the second control unit 41 when the charger is connected to the charging interface, and / or detect the electrical signal corresponding to the second power supply 45, and output a charging feedback signal to the second control unit 41 according to the electrical signal; the second control unit 41 is used to control the charging management circuit 48 to start charging when it determines the charging demand based on its own voltage, so as to charge the second power supply 45 through the charging path; and / or, to control the charging management circuit 48 to stop charging when it determines that the battery is fully charged based on the charging feedback signal.

[0076] For example, the charging control strategy in cooperation with the aforementioned second control unit 41 includes: the charging management circuit 48 feeding back an access signal to the second control unit 41 when the charger is connected to the charging interface; when the second control unit 41 determines the charging demand based on its own voltage, it controls the charging management circuit 48 to start charging so as to charge the second power supply 45 through the charging path; during the charging process, the charging management circuit 48 detects the electrical signal corresponding to the second power supply 45 and outputs a charging feedback signal to the second control unit 41 according to the electrical signal; when the second control unit 41 determines that the battery is fully charged based on the charging feedback signal, it controls the charging management circuit 48 to end the charging.

[0077] The access signal can represent the voltage signal indicating that the charger is connected when the charger is connected to the charging port 47. Optionally, when the charger is not connected to the charging port 47, the charging management circuit 48 feeds back a first voltage signal indicating that the charger is not connected to the second control unit 41, and when the charger is connected to the charging port 47, the charging management circuit 48 feeds back a second voltage signal indicating that the charger is connected to the second control unit 41, wherein the first voltage signal and the second voltage signal are different.

[0078] The electrical signal of the second power supply 45 can reflect the current power level or whether the second power supply 45 is fully charged. Optionally, when the electrical signal of the second power supply 45 is a voltage signal, the charging management circuit 48 sends the detected voltage signal corresponding to the second power supply 45 to the second control unit 41. The second control unit 41 can compare the aforementioned voltage signal with a preset full-charge voltage signal. If the comparison result is the same, it determines that the second power supply 45 is fully charged, thereby controlling the charging management circuit 48 to end the charging process.

[0079] In one embodiment, the second control unit 41 can indirectly understand the open-circuit voltage of the second power supply 45 by detecting its own voltage, thereby determining the power status of the second power supply 45. When the power status of the second power supply 45 is lower than a specific voltage value, the second control unit 41 can control the charging management circuit 48 to start charging.

[0080] In one embodiment, see Figure 4 The charging management circuit 48 includes a charging management chip U1, a switching transistor Q1, and / or a temperature sensing unit TS.

[0081] The charging management chip U1 includes a first access pin VIN1, a charging output pin VBAT, a battery detection pin SW, a first signal output pin IND1, and / or a temperature sensing pin NTC.

[0082] Among them, the first access pin VIN1 of the charging management chip U1 is connected to the charging interface 47.

[0083] The charging output pin VBAT of the charging management chip U1 is connected to the second power supply 45 through the pass terminal of the switching transistor Q1. The control terminal of the switching transistor Q1 is connected to the second control unit 41, which controls its on / off state to support the charging management circuit 48 in starting or stopping charging. Optionally, when the second control unit 41 determines the charging demand based on its own voltage, it outputs a control signal CHG EN to control the switching transistor Q1 to turn on, charging the second power supply 45.

[0084] The battery detection pin SW of the charging management chip U1 is connected to the path terminal of the switching transistor Q1 to detect the electrical signal corresponding to the second power supply 45.

[0085] The first signal output pin IND1 of the charging management chip U1 is connected to the second control unit 41. IND1 is used to determine the charging feedback signal based on the electrical signal and output the charging feedback signal to the second control unit 41. This allows the second control unit 41 to control the switching transistor Q1 to turn off when it determines the battery is fully charged based on the charging feedback signal. Optionally, if the charging feedback signal is either high or low, the second control unit 41 can determine the battery is fully charged based on the charging feedback signal and output the control signal CHG EN to control the switching transistor Q1 to turn off, thus ending the charging of the second power supply 45.

[0086] The charging management chip U1's temperature sensing pins NTC / PTC and TS are used to receive the temperature sensing signal fed back by the temperature sensing unit TS. This allows the charging management chip U1 to adjust the charging parameters according to the temperature sensing signal, and enables the charging output pin VBAT to charge the second power supply 45 according to the charging parameters. Optionally, when the temperature sensing signal indicates a high temperature, the charging power is reduced by adjusting the charging parameters to charge the second power supply 45; when the temperature sensing signal indicates a normal temperature, the second power supply 45 is charged with normal charging power using standard charging parameters.

[0087] In one embodiment, the charging management chip U1 is, for example, an SGM41524 chip.

[0088] For example, the charging management circuit 48 mainly includes a charging management chip U1 and a MOSFET (i.e., a switching transistor Q1). When the charger port is connected to the charging management circuit 48, the charging management chip U1 transmits a high-level signal to the second control unit 41, so that the second control unit 41 determines that the charger is connected and, based on its own voltage (e.g., compared with the voltage of 4.2V when fully charged), determines that there is a charging demand and sends a signal to the charging management chip U1, so that the charging management chip U1 controls a MOSFET to conduct to transmit the electrical energy input by the charger to the second power supply 45. When the charging management chip U1 detects that the second power supply 45 is fully charged, the charging management chip U1 transmits a low-level signal (IND1 = 0) to the second control unit 41, so that the second control unit 41 sends a signal to the MOSFET to control a MOSFET to turn off to end the charging. When the charging management chip U1 detects that the second power supply 45 is not fully charged, the first signal output pin IND1 outputs a high-level signal (IND1 = 1) to the second control unit 41, controlling a MOSFET to conduct to perform charging. Optionally, when the charging management chip U1 detects that the second power supply 45 is fully charged and the charging management chip U1 transmits a low-level signal (IND1 = 0) to the second control unit 41, the second control unit 41 can determine whether its own voltage corresponds to the voltage at full charge. If yes, it controls a MOSFET to turn off to end charging and reports that it is fully charged; otherwise, it controls a MOSFET to turn off to end charging and reports a fault. The charging logic in the above example is referenced below. Figure 5 As shown.

[0089] In one embodiment, the temperature sensing unit TS includes a thermistor TR and a first resistor R1 (or grounding resistor); one end of the thermistor TR is connected to the charging interface, the other end of the thermistor TR is grounded through the first resistor R1, and the other end of the thermistor TR is also connected to the temperature sensing pin NTC / PTC of the charging management chip U1, and the temperature sensing pin NTC / PTC is used to receive the voltage signal of the other end of the thermistor TR as a temperature sensing signal; wherein, the thermistor TR is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.

[0090] Optionally, the thermistor TR can be positioned at a location where the device is prone to heat during charging, such as near the second power supply 45.

[0091] Among them, the first resistor R1 not only serves as a grounding isolation (to prevent the temperature sensing signal input from the thermistor TR to the temperature sensing pin NTC / PTC from being affected), but also works with the thermistor TR to limit the voltage range of the temperature sensing signal.

[0092] Through the cooperation of the temperature sensing unit TS and the charging management chip U1, the technical solution of this embodiment can achieve safe charging by adjusting the charging power according to the changes in charging temperature through a simple and low-cost control circuit.

[0093] In one embodiment, the charging management circuit 48 may further include a charging protection unit P1. The charging protection unit P1 is connected between the charging output pin VBAT of the charging management chip U1 and the second power supply 45 to improve the safety and stability of the charging process. For example, the charging protection unit P1 includes a diode ZD and a second resistor R2. One end of the diode ZD is connected to the charging output pin VBAT, and the other end of the diode ZD is grounded. The second resistor R2 is connected in series between the charging output pin VBAT and the second power supply 45. Thus, the charging protection unit P1 can effectively prevent reverse current and avoid damaging the charging management chip U1.

[0094] In one embodiment, the charging management circuit 48 may further include an input protection unit P2, which is connected between the first access pin VIN of the charging management chip U1 and the charging interface to improve the safety and stability of power access. Exemplarily, the input protection unit P2 includes a third resistor R3 and a first capacitor C1. The charging interface is grounded through the third resistor R3 to limit the current of the charging interface 47 for overcurrent protection, and the charging interface 47 is also grounded through the first capacitor C1 for voltage regulation.

[0095] In one embodiment, the battery detection pin SW of the charging management circuit 48 is connected to the path terminal of the switching transistor Q1 through the inductor L1, so that the battery detection pin SW detects the voltage signal of the second power supply 45 and prevents reverse current from flowing into the battery detection pin SW.

[0096] In one embodiment, the first signal output pin IND1 of the charging management chip U1 is also connected to the second control unit 41 through the fourth resistor R4, which can ensure the stability of the charging feedback signal output by the first signal output pin IND1 and avoid interference from the signal in the second control unit 41.

[0097] In one embodiment, see Figure 6The push-type power tool also includes a photoelectric conversion surface 50; the charging management chip U1 in the charging management circuit 48 also includes a second access pin VIN2 and a second signal output pin IND2. The second access pin VIN2 and the second signal output pin IND2 are connected to the photoelectric conversion surface 50. When the charging interface 47 connected to the first access pin VIN1 is connected to a charger, the charging management chip U1 outputs a control signal to the charging switch of the photoelectric conversion surface 50 through the second signal output pin IND2, so that the charging switch of the photoelectric conversion surface 50 is turned off, thereby cutting off the power input from the photoelectric conversion surface to the second access pin. Thus, when the push-type power tool of this embodiment is equipped with a photoelectric conversion surface 50 (such as a solar panel), and when a charger is connected, the charger is preferentially selected for charging, cutting off the power supplied by the photoelectric conversion surface 50, avoiding uncontrollable charging power and affecting charging safety.

[0098] In one embodiment, see Figure 7 The charging management circuit 48 also includes a filter circuit P3 connected in parallel with the second power supply 45. The filter circuit P3 includes an electrolytic capacitor (i.e., the third capacitor C3 in the figure) and a ceramic capacitor (i.e.,...). Figure 6 This fourth capacitor (C4) is connected in parallel. In this embodiment, the parallel combination of electrolytic capacitors and ceramic capacitors can filter out high-frequency noise and ripple in the electrical energy to be input to the second power supply 45, thereby ensuring the stability of charging. In addition, the technical solution of this embodiment can use low-cost electrolytic capacitors and ceramic capacitors to form a filter circuit P3, which helps to control the cost of push-type power tools.

[0099] In one embodiment, the electrolytic capacitor and ceramic capacitor are positioned close to the charging interface 47, thereby shortening the high-frequency noise path, stabilizing the input voltage, and improving the safety and efficiency of subsequent charging of the second power supply 45. Optionally, the electrolytic capacitor and ceramic capacitor may be directly soldered near the charging interface 47 and the first access pin VIN1 to shorten the high-frequency noise path.

[0100] Using large-capacity electrolytic capacitors enables low-frequency filtering, while using small-capacity ceramic capacitors enables high-frequency filtering. Specifically, electrolytic capacitors filter out low-frequency ripple (such as power frequency interference) and store energy to cope with voltage fluctuations caused by sudden load changes, while ceramic capacitors filter out high-frequency noise (such as MHz-level noise from switching power supplies) and utilize their low ESR characteristics for fast response. This allows for wide-band noise suppression, ensuring charging stability.

[0101] In one implementation, the voltage rating of both electrolytic and ceramic capacitors must be higher than the maximum input power supply voltage (e.g., 25V voltage rating for a 12V input). The capacitance of the electrolytic and ceramic capacitors differs by 100-1000 times (e.g., 220μF + 0.1μF) to cover a wide frequency range.

[0102] In one embodiment, low ESR electrolytic capacitors (such as solid-state electrolytic capacitors) are selected, and X7R / X5R material is preferred for ceramic capacitors (due to their good temperature stability).

[0103] In one embodiment, the grounding pins of electrolytic capacitors and ceramic capacitors need to share a low-impedance ground plane to reduce loop inductance.

[0104] In one embodiment, the electrolytic capacitors and / or ceramic capacitors in the filter circuit are grounded through copper foil, thereby avoiding ground bounce interference, reducing voltage fluctuations, and thus improving the safety and efficiency of the second power supply 45.

[0105] In one embodiment, this embodiment can combine an electrolytic capacitor and a ceramic capacitor in parallel with a unidirectional diode (with the negative terminal connected to the input power supply terminal) to suppress surge voltage.

[0106] In one embodiment, the electrolytic capacitor and the ceramic capacitor are connected in parallel and can be connected in parallel with the second power supply 45 via a fuse FU. This can prevent the capacitor from short-circuiting and causing damage to other components.

[0107] In one embodiment, see Figure 8 The push-type power tool also includes a fast-charging chip 49, which is connected between the charging management circuit 48 and the charging interface 47. For example, the fast-charging chip 49 is integrated into the Type-C interface, compatible with the fast-charging protocols of common brand chargers on the market, meeting the fast-charging conditions of most mobile phone chargers. After power-on and the USB-PD protocol is activated, the mobile phone charger begins fast-charging the battery cells of the second power supply 45. Thus, the technical solution of this embodiment enables fast-charging of the second power supply 45 when a charger supporting fast-charging is connected to the charging interface 47, shortening the charging time.

[0108] The communication principle of the fast charging protocol corresponding to fast charging chip 49 is as follows (see...). Figure 9 ):

[0109] Source: Power supply end, in this embodiment refers to charging interface 47 (e.g., Type-C interface), which is the host in the communication process;

[0110] Sink: Power consumption terminal, in this embodiment it refers to the second power supply 45 or battery management circuit 48 that needs to be charged, and is the slave device in the communication process;

[0111] from Figure 9 As can be seen, the fast charging protocol corresponding to the fast charging chip (such as the USB-PD protocol) is the data interaction between the source and the sink, which mainly consists of 6 steps:

[0112] ① When the Source detects a pull-down resistor with a fixed resistance value, it determines that the Sink is connected. Within 200ms, the Source sends Source Capabilities to the Sink, telling it how many voltage-current combinations it can provide (generally 5V3A, 9V3A, 12V3A, 15V3A, 20V5A, etc.).

[0113] ②After receiving the signal from the source, the sink sends a GoodCRC response and then needs to send a Request within 24ms to request the voltage-current data from the source.

[0114] ③ After receiving the signal from the Sink, the Source sends a GoodCRC response and checks whether its own power supply capability can support the other party's request. If it can, it sends an Accept; otherwise, it sends a Reject.

[0115] ④ After receiving the Accept / Reject signal from the Source, the Sink sends a GoodCRC response.

[0116] ⑤ If the Source sends Accept, it will perform voltage adjustment within 450ms, and after the voltage adjustment is completed, it will send PS_Ready to the Sink.

[0117] ⑥ After receiving the Ready signal from the Source, the Sink sends a GoodCRC response.

[0118] In one embodiment, see Figure 10 The push-type power tool also includes a front-end sampling module 410 and a battery indicator module 411 connected to the second control unit 41. The front-end sampling module is used to sample the second power supply 45 to obtain and send battery information to the second control unit 41. The second control unit 41 is used to control the display of the battery indicator module according to the battery information.

[0119] In one embodiment, see Figure 10 The battery indicator module 411 may include LED indicator lights 413, a display screen (not shown in the figure), etc. The battery indicator module 411 is used to inform the user of the normal operation and fault information of the second power supply 45, and / or may also be used to indicate the battery level.

[0120] In one embodiment, the front-end sampling module 410 works in conjunction with the second power supply 45 to sample and acquire battery information such as the total voltage, single-cell voltage, current, temperature, and abnormal states of the second power supply 45, confirming the battery status and ensuring safe and reliable operation. The circuitry of the front-end sampling module 410 includes, but is not limited to, mature sampling methods such as circuit-based sampling and sampling chip sampling. The sampling chip acquires information and sends it to the front-end communication module 412 of the second control unit 41 (control chip). The second control unit 41 of the user control module 4 obtains the battery information, and the information transmission methods include, but are not limited to, IIC, SPI, UART, and CAN communication methods.

[0121] In one embodiment, see Figure 10 The user control module 4 may also include a communication module 510 and a Bluetooth module 511 (for example, included in the aforementioned first communication unit 51), both of which can be used to connect with smart devices and operate in conjunction with the APP of the push-type power tool, thus enabling the integration of IoT (Internet of Things) functions.

[0122] In one embodiment, see Figure 10 The user control module 4 may also include a host communication module 414, which is used to send the operation information of the user control module 4 to the host so that the host can monitor the operation of the push-type power tool.

[0123] In one embodiment, the user control module 4 may further include a charging communication module. Figure 9 (Not shown in the image), used for communication with the independent charging interface 47.

[0124] In one embodiment, see Figure 10 The user control module 4 may also include a switch detection module 415, used to collect detection information from various switch detection circuits in the push-type power tool. Optionally, when the push-type power tool is a lawnmower, its switch detection circuits may include, for example, a self-propelled motor switch detection circuit, a telescopic safety switch detection circuit, a cutter switch detection circuit, a power switch detection circuit, and the charging port of the first power supply 15.

[0125] In one embodiment, see Figure 10 The user control module 4 may also include a power supply circuit 416, which is used to adjust the power supply voltage provided by the second power supply 45 to the second control unit 41 and convert it into the second control unit 41 Vcc voltage through the circuit, and power the second control unit 41 through the power supply module 417, and / or power the modules of the user control module 4 that need to be powered as required.

[0126] In one embodiment, see Figure 10The user control module 4 may also include a charging control module 418, which is used to monitor the charging process and control normal charging to ensure the life, safety and reliability of the power system.

[0127] It should be understood that Figure 10 The various modules can be added or removed as needed. Optionally, the push-type power tool also includes a temperature detection module (not shown in the figure) and a heat dissipation device (not shown in the figure) connected to the second control unit 41. The temperature detection module is used to detect the temperature of the user control module 4 and / or the temperature of the second power supply 45. The second control unit 41 is used to control the heat dissipation efficiency of the heat dissipation device based on the temperature of the user control module 4 and / or the temperature of the second power supply 45. Thus, the technical solution of this embodiment provides a heat dissipation function for the second power supply 45 to ensure that the second power supply 45 is charged within a safe temperature range.

[0128] In one embodiment, the push-type power tool is a lawnmower or a snowplow.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0131] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A push-type power tool, comprising a main body, a push rod assembly connected to the main body, a main control module disposed on the main body, a first power supply, and a user control module disposed on the push rod assembly, wherein the first power supply is electrically connected to the main control module, characterized in that, The push-type power tool also includes a second power supply and multiple charging interfaces; The second power supply is disposed on the push rod assembly and is electrically connected to the user control module to supply power to the user control module; All of the aforementioned charging interfaces are electrically connected to the second power supply to form a charging path for charging the second power supply.

2. The hand-operated power tool according to claim 1, characterized in that, The charging interface is the same as that used in portable terminals.

3. The hand-operated power tool according to claim 2, characterized in that, The various charging interfaces include MicroUSB, Type-C, Lightning, and / or hollow cylindrical plugs.

4. The hand-operated power tool according to claim 1, characterized in that, It also includes a second control unit and a charging management circuit; The various charging interfaces are connected to the second power supply through the charging management circuit to form the charging path; The charging management circuit is also connected to the second control unit and is used to feed back an access signal to the second control unit when the charger is connected to the charging interface, and / or detect the electrical signal corresponding to the second power supply, and output a charging feedback signal to the second control unit according to the electrical signal; The second control unit is used to control the charging management circuit to start charging when it determines the charging demand based on its own voltage, so as to charge the second power supply through the charging path; and / or, to control the charging management circuit to stop charging when it determines that the battery is fully charged based on the charging feedback signal.

5. The hand-operated power tool according to claim 4, characterized in that, The charging management circuit includes a charging management chip, a switching transistor, and / or a temperature sensing unit. The charging management chip includes a first access pin, a charging output pin, a battery detection pin, a first signal output pin, and / or a temperature sensing pin; The first access pin of the charging management chip is connected to the charging interface; The charging output pin of the charging management chip is connected to the second power supply through the path terminal of the switching transistor. The control terminal of the switching transistor is connected to the second control unit, which controls it to be turned on or off to support the charging management circuit to start or stop charging. The battery detection pin of the charging management chip is connected to the path terminal of the switching transistor to detect the electrical signal corresponding to the second power supply. The first signal output pin of the charging management chip is connected to the second control unit, and is used to determine the charging feedback signal according to the electrical signal, and output the charging feedback signal to the second control unit, so that the second control unit controls the switching transistor to turn off when it determines that the battery is fully charged based on the charging feedback signal. The temperature sensing pin of the charging management chip is connected to the temperature sensing unit and is used to receive the temperature sensing signal fed back by the temperature sensing unit, so that the charging management chip adjusts the charging parameters according to the temperature sensing signal, and the charging output pin charges the second power supply according to the charging parameters.

6. The hand-operated power tool according to claim 5, characterized in that, The temperature sensing unit includes a thermistor and a grounding resistor; One end of the thermistor is connected to the charging interface, and the other end of the thermistor is grounded through the grounding resistor. The other end of the thermistor is also connected to the temperature sensing pin of the charging management chip, and the temperature sensing pin is used to receive the voltage signal of the other end of the thermistor as the temperature sensing signal. The thermistor is either a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.

7. The hand-operated power tool according to claim 5, characterized in that, It also includes photoelectric conversion panels; The charging management chip in the charging management circuit further includes a second access pin and a second signal output pin. The second access pin and the second signal output pin are connected to the photoelectric conversion panel. When a charger is connected to the charging interface connected to the first access pin, the charging management chip outputs a control signal to the charging switch of the photoelectric conversion panel through the second signal output pin, so that the charging switch of the photoelectric conversion panel is turned off, thereby cutting off the power input of the photoelectric conversion panel to the second access pin.

8. The hand-operated power tool according to claim 4, characterized in that, The push-type power tool further includes a fast-charging chip, which is connected between the charging management circuit and the charging interface; and / or, The push-type power tool also includes a front-end sampling module and a battery indicator module connected to the second control unit. The front-end sampling module is used to sample the second power supply to obtain and send battery information to the second control unit. The control unit is used to control the display of the battery indicator module according to the battery information. And / or, The push-type power tool also includes a temperature detection module and a heat dissipation device connected to the second control unit. The temperature detection module is used to detect the temperature of the user control module and / or the temperature of the second power supply. The second control unit is used to control the heat dissipation efficiency of the heat dissipation device according to the temperature of the user control module and / or the temperature of the second power supply.

9. The hand-operated power tool according to claim 4, characterized in that, The charging management circuit further includes a filter circuit connected in parallel with the second power supply, wherein the filter circuit comprises a combination of electrolytic capacitors and ceramic capacitors connected in parallel; and / or, The electrolytic capacitor and the ceramic capacitor are positioned adjacent to the charging interface; and / or... The electrolytic capacitor and / or the ceramic capacitor in the filter circuit are grounded through copper foil.

10. The hand-operated power tool as described in any one of claims 1-9, characterized in that, The push-type power tool is a lawnmower or snowplow.

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