Low-power supply circuit of electric power tool and electric power tool
By controlling the start and stop of the DC-DC power chip with a low-power controller, combined with battery power monitoring and timer modules, the problem of high power consumption in standby mode of traditional power supply circuits is solved, realizing low power consumption and long battery life of power tools.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU DONGCHENG TOOLS TECH CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-23
Smart Images
Figure CN224401207U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of electronic circuit technology, and in particular to a low-power power supply circuit for an electric tool and the electric tool itself. Background Technology
[0002] With the widespread use of electronic devices, power consumption has gradually become a key factor affecting device performance and battery life. Traditional power supply circuits often suffer from high power consumption and insufficient power management, causing devices to consume a large amount of power even in standby or sleep modes, thus affecting the overall energy efficiency of the device. Therefore, a low-power power supply circuit is needed that can effectively reduce power consumption and extend the device's usage time while ensuring normal operation. Utility Model Content
[0003] This disclosure provides a low-power power supply circuit for an electric tool and the electric tool itself, which helps to reduce the power consumption of the electric tool and extend its battery life.
[0004] According to some embodiments of this disclosure, one aspect of this disclosure provides a low-power power supply circuit for an electric tool, including: a battery, a DC-DC power chip, a first low-power power chip, a main control unit, and a low-power controller; the input terminal of the DC-DC power chip is connected to the battery, and the output terminal is connected to the main control unit, the DC-DC power chip being used to convert the battery voltage into the operating voltage of the main control unit to power the main control unit; the input terminal of the first low-power power chip is connected to the battery, and the output terminal is connected to the low-power controller, the first low-power power chip being used to convert the battery voltage into the operating voltage of the low-power controller to power the low-power controller; the output terminal of the low-power controller is connected to the DC-DC power chip, configured to: when the electric tool is in normal operating mode, control the DC-DC power chip to be in an on state, so that the main control unit operates normally; when the electric tool enters a low-power mode, control the DC-DC power chip to be in an off state, cutting off the power supply to the main control unit to reduce power consumption.
[0005] Preferably, the low-power controller is connected to the main control unit; the low-power controller is configured to: when receiving a sleep command sent by the main control unit, control the DC-DC power chip to switch to the off state, cutting off the power supply to the main control unit; when detecting an external wake-up signal, control the DC-DC power chip to switch to the on state, restoring the power supply to the main control unit. Preferably, the low-power power supply circuit further includes: a battery power monitoring module, connected to the battery, for real-time monitoring of battery power and outputting a battery power signal; the low-power controller is connected to the battery power monitoring module, for receiving the battery power signal and controlling the DC-DC power chip to be in the on or off state according to the battery power signal.
[0006] Preferably, the low-power controller has a built-in timer module configured to: when the low-power controller controls the DC-DC power chip to turn off, start the timer and begin timing; when the timing reaches a preset time threshold, the timer triggers a wake-up signal, causing the low-power controller to control the DC-DC power chip to turn on again, supplying power to the main control unit. Preferably, the low-power power supply circuit further includes: a second low-power power chip, with its input terminal connected to the battery and its output terminal connected to the first low-power power chip, the second low-power power chip being used to reduce the input voltage of the first low-power power chip.
[0007] Preferably, the low-power supply circuit further includes: a third low-power power chip, with its input terminal connected to the battery and its output terminal connected to the DC-DC power chip, wherein the third low-power power chip is used to reduce the input voltage of the DC-DC power chip.
[0008] Preferably, the low-power supply circuit further includes: a switching element, with a control terminal connected to the low-power controller, a power input terminal connected to the DC-DC power chip, and a power output terminal connected to the main control unit; the switching element is used to receive control signals sent by the low-power controller, and to turn on or off the connection between the DC-DC power chip and the main control unit based on the control signals.
[0009] Preferably, the output terminal of the low-power controller is connected to the enable terminal of the DC-DC power supply chip; the low-power controller controls the operating state of the DC-DC power supply chip by sending a level signal to the enable terminal. Preferably, the main control unit is a microcontroller.
[0010] According to some embodiments of this disclosure, another aspect of this disclosure also provides a power tool, including the low-power supply circuit as described in the preceding embodiments.
[0011] The technical solutions provided in this disclosure have at least the following advantages:
[0012] This invention discloses a low-power power supply circuit that monitors the status of the power tool through a low-power controller and controls the switching state of the DC-DC power chip as needed. When the power tool is in normal operating mode, the low-power controller controls the DC-DC power supply to be on, supplying power to the main control unit. When the power tool is in sleep or standby mode, the low-power controller controls the DC-DC power supply to be off, stopping the supply of power to the main control unit. This helps reduce the power consumption of the power tool and extend battery life. Attached Figure Description
[0013] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of a first low-power power supply circuit provided in an embodiment of the present disclosure;
[0015] Figure 2 This is a schematic diagram of the structure of a second low-power power supply circuit provided in an embodiment of this disclosure;
[0016] Figure 3 This is a schematic diagram of the structure of a third low-power power supply circuit provided in an embodiment of this disclosure;
[0017] Figure 4 This is a schematic diagram of the structure of a fourth low-power power supply circuit provided in the embodiments of this disclosure. Detailed Implementation
[0018] In the field of power tools, power supply circuits typically rely on DC-DC power chips or low-power power chips for voltage conversion to provide a stable operating voltage for the main control unit. Although DC-DC power chips have high conversion efficiency, their static power consumption is relatively high. Even when the power tool is in standby, idle, or non-working state, the DC-DC power supply continues to supply power to the main control unit, causing unnecessary energy loss and significantly shortening battery life. For battery-powered power tools, this directly affects their endurance and work efficiency. In contrast, while low-power power chips can significantly reduce power consumption, their lower conversion efficiency makes it difficult to meet the power output requirements of power tools under high load, thus affecting the overall performance of the device. Furthermore, traditional power supply circuits generally lack intelligent monitoring and response mechanisms for system status, failing to dynamically adjust the power supply according to actual needs, resulting in unnecessary energy consumption and shortening battery life. To at least solve or improve the above technical problems, this disclosure provides a low-power power supply circuit that monitors the status of the power tool through a low-power controller and controls the start and stop of the DC-DC power chip as needed. When the power tool is not in operation, the low-power controller shuts down the DC-DC power chip to stop supplying power to the main control unit, thereby effectively reducing standby power consumption. When an operation is required, the controller quickly wakes up the DC-DC power supply to restore power supply and ensure normal operation of the equipment. While ensuring high-performance operation of the power tool, it significantly improves battery efficiency and extends battery life.
[0019] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined. Similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple pieces" refers to two or more pieces (including two pieces).
[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0021] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.
[0022] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. For example, if the device or element in the illustration is inverted, then the element described as "below," "under," "below," or "bottom" of other elements or features will be oriented "above" or "top" of said other elements or features. Therefore, the term "below" may cover both above and below orientation depending on the context in which the term is used, which will be obvious to those skilled in the art. Materials may be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatial relative descriptive terms used herein may be interpreted accordingly.
[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0024] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of the layers are enlarged for better understanding and ease of description. Furthermore, when describing a component as "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.
[0025] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. The formation or provision of a second component above or on a first component, or on the surface of a first component, or on one side of a first component, may include embodiments where the first and second components are in direct contact, and may also include embodiments where an additional component may be present between the first and second components, thereby preventing direct contact between the first and second components. For simplicity and clarity, various components may be drawn at different scales. In the drawings, some layers / components may be omitted for simplicity. Unless otherwise specified, the formation or provision of a second component on the surface of a first component refers to direct contact between the first and second components. The term "component" may refer to a layer, film, region, portion, structure, etc.
[0026] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.
[0027] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.
[0028] Figure 1 This is a schematic diagram of the structure of a low-power power supply circuit provided in an embodiment of this disclosure.
[0029] refer to Figure 1 The low-power supply circuit includes: a battery, a DC-DC power supply chip, a first low-power power supply chip, a main control unit, and a low-power controller.
[0030] The input terminal of the DC-DC power chip is connected to the battery, and the output terminal is connected to the main control unit. The DC-DC power chip is used to convert the battery voltage into the operating voltage of the main control unit to power the main control unit.
[0031] The input terminal of the first low-power power chip is connected to the battery, and the output terminal is connected to the low-power controller. The first low-power power chip is used to convert the battery voltage into the operating voltage of the low-power controller to power the low-power controller.
[0032] The output of the low-power controller is connected to the DC-DC power supply chip and configured as follows:
[0033] When the power tool is in normal working mode, the control DC-DC power chip is turned on to enable the main control unit to operate normally.
[0034] When the power tool enters low-power mode, the control DC-DC power chip is turned off, cutting off the power supply to the main control unit.
[0035] Specifically, the battery, as the power source for the entire power tool, may not provide enough voltage for the main control unit. Therefore, a DC-DC power chip can be used to convert the battery voltage to a level suitable for the main control unit. While DC-DC power chips have high conversion efficiency, they still generate some static power consumption in standby or sleep modes. A first low-power chip provides a stable voltage to the low-power controller. Compared to the DC-DC power chip, it has lower power consumption but relatively lower conversion efficiency. The main control unit, as the core control module of the power tool, performs the main computational and control tasks. The low-power controller controls the operating state (on or off) of the DC-DC power chip. In this embodiment, a low-power controller controls the switching state of the DC-DC power chip, so that in normal operation mode, the DC-DC power chip is powered on to supply power to the main control unit; when the power tool does not need the main control unit to work (such as in standby or sleep mode), the low-power controller can turn off the DC-DC power chip and switch to a low-power mode, where the first low-power power chip supplies power to the controller. Under the premise that the power tool is working normally, the power consumption of the power tool is significantly reduced and the battery life is extended.
[0036] The embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.
[0037] In one possible implementation, the low-power controller is connected to the main control unit;
[0038] The low-power controller is configured as follows:
[0039] When a hibernation command is received from the main control unit, the DC-DC power chip is switched to the off state to cut off the power supply to the main control unit.
[0040] When an external wake-up signal is detected, the control DC-DC power chip is switched to the on state to restore power supply to the main control unit.
[0041] Specifically, when the main control unit detects that the power tool has entered standby or sleep mode (e.g., due to prolonged user inactivity), it sends a sleep command to the low-power controller. Upon receiving the sleep command, the low-power controller shuts down the DC-DC power chip, cutting off its power supply to the main control unit. The main control unit then stops operating, and the power tool enters a low-power state. At this time, the first low-power power chip powers the low-power controller, and the low-power controller and other necessary peripheral modules (such as sensors and timers) operate at a minimum, ensuring the power tool can be quickly turned on when needed. When the power tool needs to be reactivated (e.g., due to a user pressing a wake-up button or an external event triggering the process), the low-power controller detects the wake-up signal, restarts the DC-DC power chip, restoring its power supply to the main control unit. The main control unit then starts up, and the power tool resumes normal operation. By receiving sleep commands or detecting wake-up signals through the low-power controller, the DC-DC power chip can be shut down when the power tool is not needed, significantly reducing its power consumption.
[0042] In one possible implementation, the low-power power supply circuit also includes:
[0043] The battery power monitoring module connects to the battery and is used to monitor the battery power in real time and output the battery power signal.
[0044] The low-power controller is connected to the battery power monitoring module to receive battery power signals and control the DC-DC power chip to be on or off based on the battery power signals.
[0045] Specifically, the battery power monitoring module monitors the battery level in real time and sends the battery power signal to the low-power controller. The low-power controller dynamically adjusts the power supply strategy based on the battery power signal. When the battery is sufficiently charged, it maintains normal operating mode, with the DC-DC power chip powered on to supply power to the main control unit. When the battery is low, the low-power controller shuts down the DC-DC power chip, cutting off its power supply to the main control unit. The main control unit stops working, and the first low-power power chip powers the low-power controller, putting the power tool into a low-power state to extend its operating time.
[0046] For example, upon receiving a battery power signal, the low-power controller compares the signal with a preset power threshold. If the battery power signal is greater than the threshold, the controller determines the battery is sufficiently charged and maintains the power tool in normal operating mode. If the signal is less than or equal to the threshold, the controller determines the battery is insufficient, puts the power tool into low-power mode, shuts down the DC-DC power chip, cuts off its power supply to the main control unit, and the main control unit stops operating. By introducing a battery power monitoring module and combining it with the intelligent power management function of the low-power controller, this embodiment achieves precise control of the power supply, effectively extending the power tool's usage time, improving user experience, and enhancing the tool's reliability and energy efficiency.
[0047] In one possible implementation, the low-power controller has a built-in timer module configured as follows:
[0048] When the low-power controller turns off the DC-DC power chip, the timer is started and the timing begins.
[0049] When the timer reaches the preset time threshold, it triggers a wake-up signal, causing the low-power controller to turn on the DC-DC power chip again to supply power to the main control unit.
[0050] Optionally, while the main control unit sends the sleep command to the low-power controller, it can also send the sleep duration to the low-power controller. The low-power controller turns off the DC-DC power chip and starts a timer. When the sleep duration expires, the low-power controller automatically turns on the DC-DC power chip and restores the power supply of the DC-DC power chip to the main control unit.
[0051] This implementation achieves intelligent start / stop control of the DC-DC power supply chip by integrating a timer module into the low-power controller and combining it with the sleep duration configuration function of the main control unit. This not only effectively reduces the power consumption of the power tool in its non-working state but also improves the system's responsiveness and battery utilization.
[0052] In this embodiment, when the DC-DC power supply chip is in the off state, the main control unit stops working. At this time, the first low-power power supply chip supplies power to the low-power controller to ensure its continuous operation. The low-power controller can perform various monitoring functions in this power supply state, such as monitoring external wake-up events, responding to trigger commands, and detecting battery power status.
[0053] It should be understood that power chip losses are determined by the loss voltage and operating current. Since the main control unit no longer consumes current after power is off, the overall power loss of the system is significantly reduced. Furthermore, the operating current of low-power controllers is typically in the microamp (μA) range, resulting in extremely low power consumption, maintaining basic system functions while adding almost no additional energy.
[0054] Therefore, by using a low-power controller to independently manage the power supply start-up and shutdown, not only is effective energy-saving control of the main control unit achieved, but the system's functionality and responsiveness in low-power states are also guaranteed, further improving the energy efficiency of power tools in standby mode.
[0055] See Figure 2 As shown, in one possible implementation, the low-power power supply circuit further includes:
[0056] The second low-power power chip has its input terminal connected to the battery and its output terminal connected to the first low-power power chip. The second low-power power chip is used to reduce the input voltage of the first low-power power chip.
[0057] It should be understood that in the low-power mode of this disclosure, the first low-power power chip supplies power to the low-power controller. Although this effectively reduces the overall system's static power consumption, the conversion efficiency and losses of the first low-power power chip itself remain important factors affecting system energy efficiency. Due to its relatively high input voltage, it generates certain power losses during voltage conversion. These power losses mainly manifest as heat, which may cause the temperature of the first low-power power chip to rise, affecting its performance and lifespan. To further reduce the power losses of the first low-power power chip, this disclosure adds a second low-power power chip before the first low-power power chip. This aims to reduce the power losses of the low-power power chip by lowering its input voltage, thereby reducing heat generation and protecting the power chip.
[0058] See Figure 3 As shown, in one possible implementation, the low-power power supply circuit further includes:
[0059] The third low-power power chip has its input connected to the battery and its output connected to the DC-DC power chip. The third low-power power chip is used to reduce the input voltage of the DC-DC power chip.
[0060] Similarly, in this embodiment, a third low-power power chip is added in front of the DC-DC power chip. By reducing the input voltage of the power chip, the power loss of the power chip is reduced, thereby reducing heat generation and protecting the power chip.
[0061] Optional, see Figure 4As shown, the low-power supply circuit includes both a second low-power power chip and a third low-power power chip. The second low-power power chip is connected to the battery and the first low-power power chip to reduce the input voltage of the first low-power power chip. The third low-power power chip is connected to the battery and the DC-DC power chip to reduce the input voltage of the DC-DC power chip, thereby reducing the power loss of each power chip, reducing heat generation, and protecting the power chips.
[0062] In one possible implementation, the low-power power supply circuit also includes:
[0063] The switching element has its control terminal connected to the low-power controller, its power input terminal connected to the DC-DC power chip, and its power output terminal connected to the main control unit.
[0064] The switching element is used to receive control signals sent by the low-power controller and to turn on or off the connection between the DC-DC power chip and the main control unit based on the control signals.
[0065] In this implementation, the main control unit is connected to the DC-DC power supply chip via a switching element. This switching element can be a mechanical relay, a solid-state relay (SSR), or a MOSFET. The low-power controller controls the state (on or off) of the switching element to control the conduction or disconnection of the circuit between the DC-DC power supply chip and the main control unit. Specifically, in normal operating mode, the low-power controller keeps the switching element on, ensuring the circuit between the DC-DC power supply chip and the main control unit is connected, and the DC-DC power supply chip powers the main control unit. When the main control unit detects that the system has entered standby or sleep mode, it sends a sleep command to the low-power controller. Upon receiving the sleep command, the low-power controller disconnects the switching element, cutting off the power path between the DC-DC power supply chip and the main control unit. When the system needs to be reactivated, the low-power controller detects a wake-up signal, reconnects the switching element, and the circuit between the DC-DC power supply chip and the main control unit is reconnected, allowing the DC-DC power supply chip to continue powering the main control unit. By controlling the operating state of the DC-DC power supply chip through a switching element, the power path can be completely cut off when the switching element is off, providing good electrical isolation and preventing leakage current. Mechanical relays and solid-state relays are suitable for high-voltage and high-current applications because they can handle larger power.
[0066] In one possible implementation, the output of the low-power controller is connected to the enable terminal of the DC-DC power supply chip; the low-power controller controls the operating state of the DC-DC power supply chip by sending a level signal to the enable terminal.
[0067] In this implementation, the enable pin of the DC-DC power chip is a common control interface, typically used to enable or disable the chip's functionality. The low-power controller controls the DC-DC power chip's operating state by sending high or low signals to the enable pin. For example, in normal operating mode, the enable pin is set high, the DC-DC power chip is on, and it supplies power to the main control unit. When the main control unit detects that the system has entered standby or sleep mode, it sends a sleep command to the low-power controller. Upon receiving the sleep command, the low-power controller sets the enable pin low, shutting down the DC-DC power chip and stopping power supply to the main control unit. When the system needs to be reactivated, the low-power controller detects a wake-up signal, sets the enable pin high again, turns on the DC-DC power chip, and resumes power supply to the main control unit. Because the enable pin switches very quickly, typically on the nanosecond level, controlling the DC-DC power chip's operating state via the enable pin allows for rapid power-on or power-off. Furthermore, this control method can be directly integrated onto the circuit board, eliminating the need for additional physical switches and saving space and cost. Since there are no moving mechanical parts, it avoids problems such as poor contact that can occur with physical switches, resulting in higher reliability. In specific application scenarios, the user can choose the method to control the operating state of the DC-DC power chip according to their needs; this application does not impose any limitations on this.
[0068] In one possible implementation, the main control unit is a microcontroller.
[0069] Accordingly, another embodiment of this disclosure also provides a power tool, including the low-power supply circuit provided in the above embodiments.
[0070] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.
Claims
1. A low-power power supply circuit for an electric tool, characterized in that, Includes a battery, a DC-DC power supply chip, a first low-power power supply chip, a main control unit, and a low-power controller; The input terminal of the DC-DC power chip is connected to the battery, and the output terminal is connected to the main control unit. The DC-DC power chip is configured to convert the battery voltage into the operating voltage of the main control unit to power the main control unit. The input terminal of the first low-power power chip is connected to the battery, and the output terminal is connected to the low-power controller. The first low-power power chip is configured to convert the battery voltage into the operating voltage of the low-power controller to power the low-power controller. The output of the low-power controller is connected to the DC-DC power chip. The low-power controller is configured to control the DC-DC power chip to be turned on when the power tool is in normal working mode, so that the main control unit can operate normally; and to control the DC-DC power chip to be turned off when the power tool enters low-power mode, so as to cut off the power supply to the main control unit.
2. The low-power supply circuit according to claim 1, characterized in that, The low-power controller is connected to the main control unit. The low-power controller is configured to control the DC-DC power chip to switch to the off state and cut off the power supply to the main control unit when it receives a sleep command sent by the main control unit; and to control the DC-DC power chip to switch to the on state and restore the power supply to the main control unit when an external wake-up signal is detected.
3. The low-power supply circuit according to claim 1, characterized in that, The low-power supply circuit also includes: A battery power monitoring module, connected to the battery, is configured to monitor the battery power in real time and output a battery power signal; The low-power controller is connected to the battery power monitoring module and is configured to receive the battery power signal and control the DC-DC power chip to be in an on or off state according to the battery power signal.
4. The low-power supply circuit according to claim 1 or 2, characterized in that: The low-power controller has a built-in timer module. The timer module is configured to start the timer and begin counting when the low-power controller controls the DC-DC power chip to turn off. When the count reaches a preset time threshold, the timer triggers a wake-up signal, causing the low-power controller to control the DC-DC power chip to turn on again and supply power to the main control unit.
5. The low-power supply circuit according to claim 1, characterized in that, The low-power supply circuit also includes: The second low-power power chip has its input terminal connected to the battery and its output terminal connected to the first low-power power chip. The second low-power power chip is configured to reduce the input voltage of the first low-power power chip.
6. The low-power supply circuit according to claim 1 or 5, characterized in that, The low-power supply circuit also includes: A third low-power power chip has its input terminal connected to the battery and its output terminal connected to the DC-DC power chip. The third low-power power chip is configured to reduce the input voltage of the DC-DC power chip.
7. The low-power supply circuit according to claim 1, characterized in that, The low-power supply circuit also includes: The switching element has its control terminal connected to the low-power controller, its power input terminal connected to the DC-DC power chip, and its power output terminal connected to the main control unit. The switching element is configured to receive control signals sent by the low-power controller, and to turn on or off the connection between the DC-DC power chip and the main control unit based on the control signals.
8. The low-power supply circuit according to claim 1, characterized in that: The output of the low-power controller is connected to the enable terminal of the DC-DC power chip. The low-power controller is configured to control the operating state of the DC-DC power chip by sending a level signal to the enable terminal.
9. The low-power supply circuit according to claim 1, characterized in that: The main control unit is a microcontroller.
10. A power tool, characterized in that, Includes a low-power power supply circuit as described in any one of claims 1 to 9.