Battery pack with voice reminding function and electric tool

Abstract

The utility model discloses a battery pack with a voice reminding function, which is used for an electric tool and comprises a battery pack module, a power supply circuit, a main control circuit, a voice reminding circuit, an LED reminding circuit, a charging control circuit and a discharging control circuit, the battery pack module is electrically connected with the power supply circuit, the charging control circuit, the discharging control circuit and the LED reminding circuit, the power supply circuit is further electrically connected with the main control circuit and the voice reminding circuit, and the main control circuit is further electrically connected with the voice reminding circuit, the LED reminding circuit, the charging control circuit and the discharging control circuit. And the discharge control circuit is also electrically connected with an external motor and an external electric brush. According to the utility model, optimized operation of each module in the battery pack of the electric tool can be realized, a voice reminding function is added on the basis of an LED reminding function, a reminding message can be checked more conveniently, a user can grasp the working state of the battery pack more conveniently, the reminding effect is obvious, and the use experience of the user can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, specifically to a battery pack and power tool with voice prompt function. Background Technology

[0002] Power tools are mechanized tools powered by an electric motor, which drives a working head through a transmission mechanism. Vacuum cleaners, hair dryers, washing machines, lawnmowers, etc., are all examples of power tools. In power tools, the battery pack is the key device for storing and distributing electrical energy.

[0003] Currently, battery packs on the market typically include LEDs to provide reminders such as battery level, charging status, and battery health. However, LED reminders are often cumbersome, requiring users to actively check for notifications, making them inconvenient to use. Furthermore, the reminders are not very effective, resulting in a poor user experience. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and power tool with voice reminder function to solve the problems of inconvenience in using the LED reminder function on existing power tool battery packs and the lack of obvious reminder effect.

[0005] This utility model provides a battery pack with voice reminder function for power tools. The battery pack includes a battery module, a power supply circuit, a main control circuit, a voice reminder circuit, an LED reminder circuit, a charging control circuit, and a discharging control circuit.

[0006] The battery pack module is electrically connected to the power supply circuit, the charging control circuit, the discharging control circuit, and the LED reminder circuit. The power supply circuit is also electrically connected to the main control circuit and the voice reminder circuit. The main control circuit is also electrically connected to the voice reminder circuit, the LED reminder circuit, the charging control circuit, and the discharging control circuit. The discharging control circuit is also electrically connected to an external motor and brushes.

[0007] Optionally, the voice reminder circuit includes a voice chip, a speaker, a polarized capacitor PC3, a polarized capacitor PC15, and a resistor R103;

[0008] The voltage regulator pin VREG and the positive PWM signal pin PWM+ of the voice chip are both electrically connected to the main control circuit. The negative PWM signal pin PWM- and the power input pin VDD of the voice chip are both floating. The first data input / output pin IO1 of the voice chip is electrically connected to the power supply circuit. The positive terminals of the polarized capacitor PC3 and the polarized capacitor PC15 are both connected to the common connection terminal between the first data input / output pin IO1 of the voice chip and the power supply circuit. The negative terminals of the polarized capacitor PC3 and the polarized capacitor PC15 are both grounded. The signal output pin OK1 of the voice chip is electrically connected to the positive terminal of the speaker through the resistor R103. The ground pin GND of the voice chip is electrically connected to the negative terminal of the speaker. The second data input / output pin IO2 of the voice chip is grounded.

[0009] Optionally, the LED reminder circuit includes a first light-emitting diode, a second light-emitting diode, a resistor R143, and a resistor R144;

[0010] The positive terminals of the first LED and the second LED are connected together and electrically connected to the battery module. The negative terminal of the first LED is electrically connected to the main control circuit through the resistor R143, and the negative terminal of the second LED is electrically connected to the main control circuit through the resistor R144.

[0011] Optionally, the battery pack further includes interface circuitry;

[0012] The battery pack module is electrically connected to the power supply circuit, the charging control circuit, the discharging control circuit, and the LED reminder circuit through the interface circuit. The discharging control circuit is electrically connected to the motor and the brush through the interface circuit.

[0013] Optionally, the charging control circuit includes transistors QP1, QP2, QF2, MOSFET QF7, diode D12, resistors R118, R119, R145, R131, and a first resistor array.

[0014] The first resistor array consists of resistors RN4A, RN4B, RN4C, and RN4D, with the second end of resistor RN4A connected to the first end of resistor RN4B, and the second end of resistor RN4C connected to the first end of resistor RN4D.

[0015] The positive terminal of diode D12 is electrically connected to the interface circuit, the negative terminal of diode D12 is electrically connected to the emitter of transistor QP1, the negative terminal of diode D12 is also electrically connected to the first terminal of resistor RN4A, the second terminal of resistor RN4B is electrically connected to the collector of transistor QP1 through resistor R131, and the base of transistor QP1 is connected to the common connection terminal between the second terminal of resistor RN4A and the first terminal of resistor RN4B.

[0016] The base of transistor QP1 is also electrically connected to the collector of transistor QF2; the first terminal of resistor RN4C is electrically connected to the main control circuit, the second terminal of resistor RN4D is grounded, and the second terminal of resistor RN4D is also electrically connected to the emitter of transistor QF2; the base of transistor QF2 is connected to the common connection terminal between the second terminal of resistor RN4C and the first terminal of resistor RN4D.

[0017] The collector of transistor QP2 is electrically connected to the interface circuit. The collector of transistor QP1 is also electrically connected to the emitter of transistor QP2. The collector of transistor QP1 is also electrically connected to the base of transistor QP2 through resistor R118. The first end of resistor R119 is connected to the common connection between resistor R118 and the base of transistor QP2. The second end of resistor R119 is electrically connected to the drain of MOSFET QF7. The first end of resistor R145 is connected to the common connection between resistor R118 and the base of transistor QP2. The second end of resistor R119 is electrically connected to the gate of MOSFET QF7. The source of MOSFET QF7 is grounded.

[0018] Optionally, the discharge control circuit includes a brush power supply control circuit and a motor power supply control circuit;

[0019] The battery pack module is electrically connected to the brush power control circuit and the motor power control circuit through the interface circuit. The brush power control circuit is also electrically connected to the brush through the interface circuit. The motor power control circuit is also electrically connected to the motor through the interface circuit. Both the brush power control circuit and the motor power control circuit are electrically connected to the main control circuit.

[0020] Optionally, the brush power supply control circuit includes a MOSFET QF8, a fuse FU4, a diode D11, a polarized capacitor C26, a polarized capacitor C27, a resistor R14, a resistor R38, a resistor R97, a resistor R98, and a resistor R99.

[0021] The gate of the MOSFET QF8 is electrically connected to the main control circuit through the resistor R99. The gate of the MOSFET QF8 is also electrically connected to the source of the MOSFET QF8 through the resistor R38. The source of the MOSFET QF8 is electrically connected to the main control circuit through the resistor R98. The source of the MOSFET QF8 is also grounded through the resistor R97. The positive terminal of the polarized capacitor C27 is connected to the common connection terminal between the resistor R98 and the main control circuit, and the negative terminal of the polarized capacitor C27 is grounded.

[0022] The positive terminal of the polarized capacitor C26 is electrically connected to the source of the MOSFET QF8, and the negative terminal of the polarized capacitor C26 is electrically connected to the drain of the MOSFET QF8 through the first end of the resistor R14. The drain of the MOSFET QF8 is also electrically connected to the brush in sequence through the fuse FU4 and the interface circuit, and the drain of the MOSFET QF8 is also electrically connected to the battery module in sequence through the diode D11 and the interface circuit.

[0023] Optionally, the motor power control circuit includes a MOSFET MQ3, a diode D6, a polarized capacitor C22, a polarized capacitor C24, a resistor R30, a resistor R47, a resistor R49, a resistor R57, and a resistor R96.

[0024] The gate of the MOSFET MQ3 is electrically connected to the main control circuit through the resistor R57. The first end of the resistor R30 is connected to the common connection terminal between the resistor R57 and the main control circuit, and the second end of the resistor R30 is electrically connected to the source of the MOSFET MQ3. The first ends of the resistors R96 and R49 are both connected to the common connection terminal between the second end of the resistor R30 and the source of the MOSFET MQ3. The second end of the resistor R96 is grounded, and the second end of the resistor R49 is electrically connected to the main control circuit. The positive terminal of the polarized capacitor C22 is connected to the common connection terminal between the second end of the resistor R49 and the main control circuit, and the negative terminal of the polarized capacitor C22 is grounded.

[0025] The drain of the MOSFET MQ3 is electrically connected to the battery module through the diode D6 and the interface circuit. The drain of the MOSFET MQ3 is also electrically connected to the motor through the interface circuit. The first end of the resistor R47 is connected to the common connection terminal between the drain of the MOSFET MQ3 and the interface circuit. The second end of the resistor R47 is connected to the common connection terminal between the second end of the resistor R30 and the source of the MOSFET MQ3 through the polarized capacitor C24.

[0026] Optionally, the power supply circuit includes a voltage conversion chip, transistors Q1 and QF1, common cathode diodes D10, D17, and D18, inductor PL1, polarized capacitors C3, C7, C89, PC5, PC6, PC8, PC9, PC13, and PC14, resistors R52, R5, R7, R8, R9, R10, R117, R128, R129, R130, PR6, PR7, and a second resistor array.

[0027] The second resistor array consists of resistors RN1A, RN1B, RN1C, and RN1D. The first end of resistor RN1A is connected to the second end of resistor RN1B, and the first end of resistor RN1C is connected to the first end of resistor RN1D.

[0028] The emitter of transistor Q1 is electrically connected to the interface circuit, and the emitter of transistor Q1 is also electrically connected to the second terminal of resistor RN1A; the base of transistor Q1 is connected to the common connection terminal between the first terminal of resistor RN1A and the second terminal of resistor RN1B; the first terminal of resistor RN1B is electrically connected to the first anode of common cathode diode D10, the second anode of common cathode diode D10 is electrically connected to the main control circuit, and the first terminal of resistor R52 and the positive terminal of polarized capacitor C3 are both connected to the common connection terminal between the second anode of common cathode diode D10 and the main control circuit. The second end of resistor R52 is also directly connected to the main control circuit; the negative terminal of polarized capacitor C3 is grounded; the cathode of common cathode diode D10 is connected to the interface circuit; the first end of resistor RN1B is also connected to the collector of transistor QF1 through resistor R130; the base of transistor QF1 is connected to the common connection terminal between the first end of resistor RN4C and the first end of resistor RN1D; the second end of resistor RN1D is connected to the main control circuit; the second end of resistor RN4C is connected to the emitter of transistor QF1; the emitter of transistor QF1 is also grounded.

[0029] The collector of transistor Q1 is grounded sequentially through resistors R7 and R9. The main control circuit is also electrically connected to the common connection terminal between resistors R7 and R9. The collector of transistor Q1 is also electrically connected to the first end of resistor R5 through diode D17. The first end of resistor R117 is connected to the first end of resistor R5. The second end of resistor R117 is connected to the second end of resistor R5 and is electrically connected to the VCC power supply terminal. The cathode of diode D18 is connected to the common connection terminal between the first end of resistor R117 and the first end of resistor R5. The anode of diode D18 is electrically connected to the interface circuit. The anode of diode D18 is also grounded sequentially through resistors R8 and R10. The anode of polarized capacitor C7 is connected to the common connection terminal between resistors R8 and R10. The cathode of polarized capacitor C7 is grounded. The main control circuit is also electrically connected to the common connection terminal between resistors R8 and R10.

[0030] The power input pin VIN of the voltage conversion chip is electrically connected to the VCC power supply terminal. The power input pin VIN is also electrically connected to the enable pin EN of the voltage conversion chip via resistor R128. The positive terminals of polarized capacitors PC5 and PC6 are both connected to the common connection terminal between the power input pin VIN and resistor R128. The negative terminals of polarized capacitors PC5 and PC6 are both grounded. The ground pin GND of the voltage conversion chip is grounded.

[0031] The boost capacitor pin BOOT of the voltage conversion chip is electrically connected to the negative terminal of the polarized capacitor C89. The switch output pin SW of the voltage conversion chip is electrically connected to the positive terminal of the polarized capacitor C89. The switch output pin SW of the voltage conversion chip is also electrically connected to the negative terminal of the polarized capacitor PC14 through the resistor R129. The positive terminal of the polarized capacitor PC14 is grounded. The switch output pin SW of the voltage conversion chip is also electrically connected to the main control circuit through the inductor PL1. The first terminal of the resistor PR6, the positive terminal of the polarized capacitor PC13, The positive terminals of the polarized capacitors PC8 and PC9 are both connected to the common connection terminal between the inductor PL1 and the main control circuit. The second terminal of the resistor PR6 is connected together with the negative terminal of the polarized capacitor PC13 and electrically connected to the feedback pin FB of the voltage conversion chip. The negative terminals of the polarized capacitors PC8 and PC9 are both grounded. The first terminal of the resistor PR7 is connected to the common connection terminal between the second terminal of the resistor PR6 and the negative terminal of the polarized capacitor PC13, and the second terminal of the resistor PR7 is grounded.

[0032] In addition, this utility model also provides an electric tool, including the aforementioned battery pack with voice prompt function, and also includes a motor and brushes;

[0033] The battery pack with voice prompt function is electrically connected to both the motor and the brush.

[0034] The beneficial effects of this utility model are:

[0035] The battery pack module is electrically connected to the power supply circuit, charging control circuit, discharging control circuit, and LED voice reminder circuit. On one hand, it provides power to the circuit modules within the battery pack that require power, including the power supply circuit, charging control circuit, discharging control circuit, and LED voice reminder circuit. On the other hand, it provides power to external motors and brushes through the discharging control circuit, achieving energy storage and output functions. The power supply circuit is also electrically connected to the main control circuit and voice reminder circuit, directly providing the necessary operating voltage to ensure their normal operation. The main control circuit and voice reminder circuit... The wake-up circuit and LED reminder circuit are electrically connected, and can send commands to the voice reminder circuit and LED reminder circuit respectively through the main control circuit to realize the functions of voice reminder and LED reminder respectively; the main control circuit is also electrically connected to the charging control circuit and the discharging control circuit, which can realize the charging and discharging control of the entire battery pack respectively; power tools are usually equipped with motors and brushes. The motor is used to drive the power tool to work, and the brushes are used to transfer electrical energy to rotating parts (such as commutators or armatures). The discharging control circuit is also electrically connected to the external motor and brushes, and can realize the control of the motor power supply and the control of the brush power supply respectively when the battery pack supplies power to the motor and brushes respectively, so as to achieve more optimized power management of the battery pack;

[0036] This utility model relates to a battery pack and power tools with voice reminder function, which can optimize the operation of each module in the power tool battery pack. In addition to the LED reminder function of traditional power tool battery packs, a voice reminder function is added. It is more convenient to view reminder messages such as battery level reminder, charging status reminder, and battery health status prompt, making it easier for users to grasp the working status of the battery pack. The reminder effect is obvious and can effectively improve the user experience. Attached Figure Description

[0037] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0038] Figure 1 This diagram shows a structural diagram of a battery pack with voice reminder function according to Embodiment 1 of the present invention;

[0039] Figure 2 The circuit design diagram of the voice reminder circuit in Embodiment 1 of this utility model is shown;

[0040] Figure 3 The circuit design diagram of the LED reminder circuit in Embodiment 1 of this utility model is shown;

[0041] Figure 4This diagram shows a structural diagram of another battery pack with voice reminder function according to Embodiment 1 of this utility model;

[0042] Figure 5A and Figure 5B The circuit design diagram of the interface circuit in Embodiment 1 of this utility model is shown;

[0043] Figure 6 The circuit design diagram of the charging control circuit in Embodiment 1 of this utility model is shown;

[0044] Figure 7A The circuit design diagram of the brush power supply control circuit in Embodiment 1 of this utility model is shown;

[0045] Figure 7B The circuit design diagram of the motor power supply control circuit in Embodiment 1 of this utility model is shown;

[0046] Figure 8A and Figure 8B The circuit design diagram of the power supply circuit in Embodiment 1 of this utility model is shown;

[0047] Figure 9 A structural diagram of an electric tool according to Embodiment 2 of this utility model is shown. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0050] Example 1

[0051] like Figure 1 As shown, a battery pack with voice reminder function is used for power tools. The battery pack includes a battery module, a power supply circuit, a main control circuit, a voice reminder circuit, an LED reminder circuit, a charging control circuit, and a discharging control circuit.

[0052] The battery pack module is electrically connected to the power supply circuit, the charging control circuit, the discharging control circuit, and the LED reminder circuit. The power supply circuit is also electrically connected to the main control circuit and the voice reminder circuit. The main control circuit is also electrically connected to the voice reminder circuit, the LED reminder circuit, the charging control circuit, and the discharging control circuit. The discharging control circuit is also electrically connected to an external motor and brushes.

[0053] In this embodiment, the battery pack module is electrically connected to the power supply circuit, charging control circuit, discharging control circuit, and LED voice reminder circuit. On one hand, it provides power to the circuit modules within the entire battery pack that require power, including the power supply circuit, charging control circuit, discharging control circuit, and LED voice reminder circuit. On the other hand, it provides power to external motors and brushes through the discharging control circuit, achieving energy storage and output functions. The power supply circuit is also electrically connected to the main control circuit and the voice reminder circuit, directly providing the necessary operating voltage to ensure their normal operation. Electrically connected to the voice reminder circuit and LED reminder circuit, the main control circuit can send commands to the voice reminder circuit and LED reminder circuit respectively to realize the functions of voice reminder and LED reminder. The main control circuit is also electrically connected to the charging control circuit and the discharging control circuit, which can realize the charging and discharging control of the entire battery pack respectively. Power tools are usually equipped with motors and brushes. The motor is used to drive the power tool to work, and the brushes are used to transfer electrical energy to rotating parts (such as commutators or armatures). The discharging control circuit is also electrically connected to the external motor and brushes, which can realize the control of the motor power supply and the brush power supply respectively when the battery pack supplies power to the motor and brushes respectively, so as to achieve more optimized power management of the battery pack.

[0054] The battery pack with voice reminder function in this embodiment can optimize the operation of each module in the power tool battery pack. In addition to the LED reminder function of the traditional power tool battery pack, a voice reminder function is added. It is more convenient to view reminder messages such as battery level reminder, charging status reminder, and battery health status prompt, making it easier for users to grasp the working status of the battery pack. The reminder effect is obvious and can effectively improve the user experience.

[0055] It should be understood that this utility model only improves the hardware circuitry of the battery pack used in power tools. Through hardware circuit design, it not only implements the LED reminder function of the battery pack but also a voice reminder function for the battery pack's operating status. It does not involve any improvement to the computer program. The computer programs controlling the voice reminder circuit, LED reminder circuit, charging control circuit, and discharging control circuit of the main control circuit all use conventional control programs, which can be pre-stored in the main control circuit's memory or storage area.

[0056] In this embodiment, power tools include, but are not limited to, vacuum cleaners, hair dryers, washing machines, and lawn mowers.

[0057] In this embodiment, the battery pack module can be composed of multiple individual batteries (such as lithium batteries) connected in series or in parallel. The number of individual batteries and the connection method are not limited in this embodiment.

[0058] In this embodiment, the main control circuit is specifically an MCU (microcontroller), such as an STM32 series microcontroller.

[0059] Preferably, such as Figure 2 As shown, the voice reminder circuit includes a voice chip, a speaker, a polarized capacitor PC3, a polarized capacitor PC15, and a resistor R103.

[0060] The voltage regulator pin VREG and the positive PWM signal pin PWM+ of the voice chip are both electrically connected to the main control circuit. The negative PWM signal pin PWM- and the power input pin VDD of the voice chip are both floating. The first data input / output pin IO1 of the voice chip is electrically connected to the power supply circuit. The positive terminals of the polarized capacitor PC3 and the polarized capacitor PC15 are both connected to the common connection terminal between the first data input / output pin IO1 of the voice chip and the power supply circuit. The negative terminals of the polarized capacitor PC3 and the polarized capacitor PC15 are both grounded. The signal output pin OK1 of the voice chip is electrically connected to the positive terminal of the speaker through the resistor R103. The ground pin GND of the voice chip is electrically connected to the negative terminal of the speaker. The second data input / output pin IO2 of the voice chip is grounded.

[0061] In the voice reminder circuit described above, the voice chip's voltage regulator pin VREG and PWM signal positive pin PWM+ are electrically connected to the main control circuit, receiving control signals from the main control circuit. The voice chip stores, processes, and outputs these signals, and then connects them to the speaker via the voice chip's signal output pin OK1 and ground pin GND to drive the speaker to play voice, thus achieving an efficient voice reminder function. Specifically, the voice chip's voltage regulator pin VREG receives a stable voltage provided by the main control circuit, ensuring the voice chip operates under a stable voltage environment, improving the circuit's reliability and stability. The voice chip's PWM signal positive pin PWM+ receives PWM (Pulse Width Modulation) signals sent by the main control circuit, used to adjust the voice chip's volume or perform other control operations, making volume adjustment more flexible and precise.

[0062] The voice reminder circuit described in this embodiment has a high degree of integration and modularity, flexible control and signal processing capabilities, and can achieve efficient voice reminder functions. It also features a simple structural design and low power consumption.

[0063] Specifically, in Figure 2 In the process, the voltage regulator pin VREG of the voice chip is connected to the A_BUSY pin of the main control circuit (specifically the MCU) to receive a stable voltage; the positive PWM signal pin PWM+ of the voice chip is connected to the A_DAT pin of the main control circuit (specifically the MCU) to receive the PWM signal.

[0064] Specifically, the voice chip is an NVC voice chip, which is characterized by stable performance, good sound quality, convenient control, and low power consumption. The specific model can be selected based on actual needs; this embodiment does not impose any restrictions.

[0065] Preferably, such as Figure 3 As shown, the LED reminder circuit includes a first light-emitting diode, a second light-emitting diode, a resistor R143, and a resistor R144;

[0066] The positive terminals of the first LED and the second LED are connected together and electrically connected to the battery module. The negative terminal of the first LED is electrically connected to the main control circuit through the resistor R143, and the negative terminal of the second LED is electrically connected to the main control circuit through the resistor R144.

[0067] In the LED reminder circuit described above, the positive terminals of both LEDs are electrically connected to the battery module, allowing them to obtain the required DC voltage (e.g., 5V). The negative terminals of each LED are electrically connected to the main control circuit via a resistor, enabling them to receive control signals from the main control circuit and control the LEDs to turn on and off, thus achieving an efficient LED reminder function. This LED reminder circuit is simple in structure, easy to build and maintain, easy to control, and exhibits high reliability and stability.

[0068] Specifically, when the positive terminals of the two LEDs are electrically connected to the battery module, they can also be indirectly connected to the battery module through the interface circuit. This provides good flexibility and compatibility, making it easy to expand and applicable to different battery modules. On the other hand, it offers better safety and stability, ensuring that the LED reminder circuit can operate within a safe current and voltage range.

[0069] Specifically, in Figure 3 In the circuit, the first light-emitting diode is connected to the LED1 pin of the main control circuit (specifically the MCU) through resistor R143, and receives the LED control signal output by the main control circuit; the first light-emitting diode is connected to the LED2 pin of the main control circuit (specifically the MCU) through resistor R144, and receives the LED control signal output by the main control circuit.

[0070] Preferably, such as Figure 4 As shown, the battery pack also includes an interface circuit;

[0071] The battery pack module is electrically connected to the power supply circuit, the charging control circuit, the discharging control circuit, and the LED reminder circuit through the interface circuit. The discharging control circuit is electrically connected to the motor and the brush through the interface circuit.

[0072] The connections between the battery pack module and the power supply circuit, charging control circuit, discharging control circuit, and LED reminder circuit, as well as the connections between the discharging control circuit and the motor and brushes, are all indirectly achieved through interface circuits. These interface circuits can be flexibly adjusted and optimized according to actual needs, simplifying the complex connections between the battery pack module, charging control circuit, discharging control circuit, motor, and brushes. They can adapt to different application scenarios and reduce the complexity and cost of circuit design. These interface circuits can also isolate the various circuit modules, preventing the fault from spreading to other circuit modules when one circuit module fails, thus improving the safety and stability of the system.

[0073] Specifically, the interface circuit of this embodiment is as follows: Figure 5A and Figure 5B As shown, the core components include Figure 5AThe charging port DC1 and Figure 5B Connector J4 in the middle. Among them, in Figure 5A In the charging connector DC1, pin 4 is electrically connected to the positive charging terminal CH+ of the battery module, the charging control circuit, and the power supply circuit via fuse FU3. Pin 2 of the charging connector DC1 is electrically connected to the negative charging terminal CH- of the battery module. Figure 5B In this circuit, pins 1 and 2 of connector J4 are electrically connected to the positive terminal B+ of the battery in the battery pack module. Pin 2 of connector J4 is also electrically connected to the power supply circuit, charging control circuit, and discharging control circuit, respectively. Pin 3 of connector J4 is electrically connected to the power supply circuit. Pin 4 of connector J4 is electrically connected to the discharging control circuit and the motor through resistor R142. Pin 4 of connector J4 is also electrically connected to the main control circuit through diode D13A. Pin 5 of connector J4 is electrically connected to the power supply circuit through diode D14. Pin 5 of connector J4 is also electrically connected to the LED reminder circuit. Pin 6 of connector J4 is electrically connected to the main control circuit through resistor R20. Pin 7 of connector J4 is grounded through resistor R111. Pin 8 of connector J4 is electrically connected to the discharging control circuit and the brush, respectively. Pins 9 and 10 of connector J4 are also electrically connected to the discharging control circuit and the motor, respectively.

[0074] Preferably, such as Figure 6 As shown, the charging control circuit includes transistors QP1, QP2, QF2, MOSFET QF7, diode D12, resistors R118, R119, R145, R131, and a first resistor array.

[0075] The first resistor array consists of resistors RN4A, RN4B, RN4C, and RN4D, with the second end of resistor RN4A connected to the first end of resistor RN4B, and the second end of resistor RN4C connected to the first end of resistor RN4D.

[0076] The positive terminal of diode D12 is electrically connected to the interface circuit, the negative terminal of diode D12 is electrically connected to the emitter of transistor QP1, the negative terminal of diode D12 is also electrically connected to the first terminal of resistor RN4A, the second terminal of resistor RN4B is electrically connected to the collector of transistor QP1 through resistor R131, and the base of transistor QP1 is connected to the common connection terminal between the second terminal of resistor RN4A and the first terminal of resistor RN4B.

[0077] The base of transistor QP1 is also electrically connected to the collector of transistor QF2; the first terminal of resistor RN4C is electrically connected to the main control circuit, the second terminal of resistor RN4D is grounded, and the second terminal of resistor RN4D is also electrically connected to the emitter of transistor QF2; the base of transistor QF2 is connected to the common connection terminal between the second terminal of resistor RN4C and the first terminal of resistor RN4D.

[0078] The collector of transistor QP2 is electrically connected to the interface circuit. The collector of transistor QP1 is also electrically connected to the emitter of transistor QP2. The collector of transistor QP1 is also electrically connected to the base of transistor QP2 through resistor R118. The first end of resistor R119 is connected to the common connection between resistor R118 and the base of transistor QP2. The second end of resistor R119 is electrically connected to the drain of MOSFET QF7. The first end of resistor R145 is connected to the common connection between resistor R118 and the base of transistor QP2. The second end of resistor R119 is electrically connected to the gate of MOSFET QF7. The source of MOSFET QF7 is grounded.

[0079] In the charging control circuit described above, the emitter of transistor QP1 is connected to the signal of the positive terminal of the battery pack module, and the collector of transistor QP2 is connected to the signal of the positive terminal of the battery pack module, enabling the input of electrical energy into the battery pack module. At the same time, the base of transistor QF2 is connected to the control signal of the main control circuit through the resistor RN4C in the first resistor array, enabling the switching control of the charging state to be realized by the switching combination of transistors QF2, QP1, and QP2 under the control of the main control circuit.

[0080] Specifically, in Figure 6 In the circuit, the positive terminal of diode D12 is connected to pin 4 of charging port DC1 through fuse FU3, the collector of transistor QP2 is connected to pin 2 of connector, and the first end of resistor RN4C is connected to the CHAR_EN pin of the main control circuit (specifically MCU).

[0081] Preferably, such as Figure 4 As shown, the discharge control circuit includes a brush power supply control circuit and a motor power supply control circuit;

[0082] The battery pack module is electrically connected to the brush power control circuit and the motor power control circuit through the interface circuit. The brush power control circuit is also electrically connected to the brush through the interface circuit. The motor power control circuit is also electrically connected to the motor through the interface circuit. Both the brush power control circuit and the motor power control circuit are electrically connected to the main control circuit.

[0083] By using the brush power control circuit and the motor power control circuit, the power control required by the brushes and motor configured in the power tool can be realized independently, which can improve the optimization of power distribution management of the battery pack.

[0084] Preferably, such as Figure 7A As shown, the brush power control circuit includes a MOSFET QF8, a fuse FU4, a diode D11, a polarized capacitor C26, a polarized capacitor C27, a resistor R14, a resistor R38, a resistor R97, a resistor R98, and a resistor R99.

[0085] The gate of the MOSFET QF8 is electrically connected to the main control circuit through the resistor R99. The gate of the MOSFET QF8 is also electrically connected to the source of the MOSFET QF8 through the resistor R38. The source of the MOSFET QF8 is electrically connected to the main control circuit through the resistor R98. The source of the MOSFET QF8 is also grounded through the resistor R97. The positive terminal of the polarized capacitor C27 is connected to the common connection terminal between the resistor R98 and the main control circuit, and the negative terminal of the polarized capacitor C27 is grounded.

[0086] The positive terminal of the polarized capacitor C26 is electrically connected to the source of the MOSFET QF8, and the negative terminal of the polarized capacitor C26 is electrically connected to the drain of the MOSFET QF8 through the first end of the resistor R14. The drain of the MOSFET QF8 is also electrically connected to the brush in sequence through the fuse FU4 and the interface circuit, and the drain of the MOSFET QF8 is also electrically connected to the battery module in sequence through the diode D11 and the interface circuit.

[0087] In the brush power control circuit described above, the gate of the MOSFET QF8 is connected to the PWM control signal of the main control circuit. The drain of the MOSFET QF8 is electrically connected to the brush through an interface circuit on one hand, and to the battery pack module through an interface circuit on the other hand. Therefore, under the control of the main control circuit, the power supply to the brush can be realized from the battery pack. At the same time, the signal output from the source of the MOSFET QF8 is also connected to the main control circuit, which can realize the detection and feedback of the brush current. Based on this current signal, the PWM control signal output by the main control circuit can be adjusted to further control the MOSFET QF8 and realize the overcurrent protection of the brush current.

[0088] Specifically, in Figure 7AIn the circuit, the gate of MOSFET QF8 is electrically connected to the BRUSH_PWM pin of the main control circuit (specifically the MCU) through resistor R99, and the PWM control signal is received; the source of MOSFET QF8 is electrically connected to the BRUSH_CUR pin of the main control circuit (specifically the MCU) through resistor R98, and the detected brush current is fed back to the main control circuit.

[0089] Preferably, such as Figure 7B As shown, the motor power control circuit includes a MOSFET MQ3, a diode D6, a polarized capacitor C22, a polarized capacitor C24, a resistor R30, a resistor R47, a resistor R49, a resistor R57, and a resistor R96.

[0090] The gate of the MOSFET MQ3 is electrically connected to the main control circuit through the resistor R57. The first end of the resistor R30 is connected to the common connection terminal between the resistor R57 and the main control circuit, and the second end of the resistor R30 is electrically connected to the source of the MOSFET MQ3. The first ends of the resistors R96 and R49 are both connected to the common connection terminal between the second end of the resistor R30 and the source of the MOSFET MQ3. The second end of the resistor R96 is grounded, and the second end of the resistor R49 is electrically connected to the main control circuit. The positive terminal of the polarized capacitor C22 is connected to the common connection terminal between the second end of the resistor R49 and the main control circuit, and the negative terminal of the polarized capacitor C22 is grounded.

[0091] The drain of the MOSFET MQ3 is electrically connected to the battery module through the diode D6 and the interface circuit. The drain of the MOSFET MQ3 is also electrically connected to the motor through the interface circuit. The first end of the resistor R47 is connected to the common connection terminal between the drain of the MOSFET MQ3 and the interface circuit. The second end of the resistor R47 is connected to the common connection terminal between the second end of the resistor R30 and the source of the MOSFET MQ3 through the polarized capacitor C24.

[0092] Similar to the brush power supply control circuit, in the motor power supply control circuit with the above structure, the gate of MOSFET MQ3 is connected to the PWM control signal of the main control circuit, and the drain of MOSFET MQ3 is electrically connected to the motor through an interface circuit on the one hand, and to the battery pack module through an interface circuit on the other hand. Therefore, under the control of the main control circuit, the power input of the battery pack and the power supply to the motor can be realized. At the same time, the signal output from the source of MOSFET MQ3 is also connected to the main control circuit, which can realize the detection and feedback of motor current. Based on this current signal, MOSFET MQ3 can be further controlled to realize the overcurrent protection of motor current.

[0093] Specifically, in Figure 7B In the circuit, the gate of MOSFET MQ3 is electrically connected to the MOTOR_PWM pin of the main control circuit (specifically the MCU) through resistor R57, and receives the PWM control signal; the source of MOSFET MQ3 is electrically connected to the CUR pin of the main control circuit (specifically the MCU) through resistor R49, and feeds back the detected motor current to the main control circuit.

[0094] Preferably, such as Figure 8A and Figure 8B As shown, the power supply circuit includes a voltage conversion chip, transistors Q1 and QF1, common cathode diodes D10, D17, and D18, inductor PL1, polarized capacitors C3, C7, C89, PC5, PC6, PC8, PC9, PC13, and PC14, resistors R52, R5, R7, R8, R9, R10, R117, R128, R129, R130, PR6, PR7, and a second resistor array.

[0095] The second resistor array consists of resistors RN1A, RN1B, RN1C, and RN1D. The first end of resistor RN1A is connected to the second end of resistor RN1B, and the first end of resistor RN1C is connected to the first end of resistor RN1D.

[0096] The emitter of transistor Q1 is electrically connected to the interface circuit, and the emitter of transistor Q1 is also electrically connected to the second terminal of resistor RN1A; the base of transistor Q1 is connected to the common connection terminal between the first terminal of resistor RN1A and the second terminal of resistor RN1B; the first terminal of resistor RN1B is electrically connected to the first anode of common cathode diode D10, the second anode of common cathode diode D10 is electrically connected to the main control circuit, and the first terminal of resistor R52 and the positive terminal of polarized capacitor C3 are both connected to the common connection terminal between the second anode of common cathode diode D10 and the main control circuit. The second end of resistor R52 is also directly connected to the main control circuit; the negative terminal of polarized capacitor C3 is grounded; the cathode of common cathode diode D10 is connected to the interface circuit; the first end of resistor RN1B is also connected to the collector of transistor QF1 through resistor R130; the base of transistor QF1 is connected to the common connection terminal between the first end of resistor RN4C and the first end of resistor RN1D; the second end of resistor RN1D is connected to the main control circuit; the second end of resistor RN4C is connected to the emitter of transistor QF1; the emitter of transistor QF1 is also grounded.

[0097] The collector of transistor Q1 is grounded sequentially through resistors R7 and R9. The main control circuit is also electrically connected to the common connection terminal between resistors R7 and R9. The collector of transistor Q1 is also electrically connected to the first end of resistor R5 through diode D17. The first end of resistor R117 is connected to the first end of resistor R5. The second end of resistor R117 is connected to the second end of resistor R5 and is electrically connected to the VCC power supply terminal. The cathode of diode D18 is connected to the common connection terminal between the first end of resistor R117 and the first end of resistor R5. The anode of diode D18 is electrically connected to the interface circuit. The anode of diode D18 is also grounded sequentially through resistors R8 and R10. The anode of polarized capacitor C7 is connected to the common connection terminal between resistors R8 and R10. The cathode of polarized capacitor C7 is grounded. The main control circuit is also electrically connected to the common connection terminal between resistors R8 and R10.

[0098] The power input pin VIN of the voltage conversion chip is electrically connected to the VCC power supply terminal. The power input pin VIN is also electrically connected to the enable pin EN of the voltage conversion chip via resistor R128. The positive terminals of polarized capacitors PC5 and PC6 are both connected to the common connection terminal between the power input pin VIN and resistor R128. The negative terminals of polarized capacitors PC5 and PC6 are both grounded. The ground pin GND of the voltage conversion chip is grounded.

[0099] The boost capacitor pin BOOT of the voltage conversion chip is electrically connected to the negative terminal of the polarized capacitor C89. The switch output pin SW of the voltage conversion chip is electrically connected to the positive terminal of the polarized capacitor C89. The switch output pin SW of the voltage conversion chip is also electrically connected to the negative terminal of the polarized capacitor PC14 through the resistor R129. The positive terminal of the polarized capacitor PC14 is grounded. The switch output pin SW of the voltage conversion chip is also electrically connected to the main control circuit through the inductor PL1. The first terminal of the resistor PR6, the positive terminal of the polarized capacitor PC13, The positive terminals of the polarized capacitors PC8 and PC9 are both connected to the common connection terminal between the inductor PL1 and the main control circuit. The second terminal of the resistor PR6 is connected together with the negative terminal of the polarized capacitor PC13 and electrically connected to the feedback pin FB of the voltage conversion chip. The negative terminals of the polarized capacitors PC8 and PC9 are both grounded. The first terminal of the resistor PR7 is connected to the common connection terminal between the second terminal of the resistor PR6 and the negative terminal of the polarized capacitor PC13, and the second terminal of the resistor PR7 is grounded.

[0100] In the power supply circuit described above, the emitter of transistor Q1 is electrically connected to the battery module via an interface circuit, enabling the access of battery power. The base of transistor Q1 is electrically connected to the main control circuit via a common cathode diode D10, allowing the input of button signals transmitted through the main control circuit after user operation, thus enabling button control of power supply. The base of transistor Q1 is also electrically connected to the main control circuit via transistor QF1, allowing the input of control signals from the main control circuit. These control signals enable switching control of transistor QF1, thus controlling the power supply. The collector of transistor Q1 is electrically connected to the VCC power supply terminal via diode D17 and resistor R5, providing power to the subsequent voltage conversion chip and supplying the operating voltage VCC required for normal operation. The voltage conversion chip then outputs the circuit voltage VDD required by the main control circuit. Finally, the collector of transistor Q1 is electrically connected to the main control circuit via resistor R7, enabling voltage sampling, detection, and feedback, thus providing overvoltage protection during the power supply process.

[0101] Specifically, in Figure 8A and Figure 8B In the circuit, the second anode of the common cathode diode D10 is connected to the KEY pin of the main control circuit (specifically the MCU) to receive the button signal output by the main control circuit; the second pin of the resistor RN1D in the second resistor array is connected to the PWR_CTRL pin of the main control circuit (specifically the MCU) to receive the control signal output by the main control circuit; the second end of the resistor R7 is electrically connected to the V6 pin of the main control circuit (specifically the MCU) to realize voltage detection.

[0102] It should be understood that the electronic components (such as resistors, polarized capacitors, transistors, MOSFETs, diodes, etc.) in the circuit modules described above in this embodiment can be selected according to the actual situation and appropriate specifications or product models on the market, which will not be listed here.

[0103] Example 2

[0104] like Figure 9 As shown, a power tool includes a battery pack with voice prompt function as in Embodiment 1, and also includes a motor and brushes;

[0105] The battery pack with voice prompt function is electrically connected to both the motor and the brush.

[0106] In power tools, the motor drives the tool to work, while the brushes transmit electrical energy to rotating components (such as commutators or armatures). In this embodiment, the battery pack with voice reminder function (specifically, the discharge control circuit in the battery pack) is electrically connected to both the motor and the brushes. In addition to realizing the voice reminder function of the battery pack, it can also control the power supply of the motor and the brushes respectively when the battery pack supplies power to the motor and the brushes, so as to achieve more optimized power management of the battery pack.

[0107] The structure of the battery pack with voice prompt function in the power tool described in this embodiment is the same as that of the battery pack with voice prompt function in Embodiment 1. Therefore, for details not covered in this embodiment, please refer to Embodiment 1 and... Figures 1 to 8B The specific details will not be elaborated here.

[0108] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack having a voice reminding function, characterized by, The battery pack for electric tools comprises a battery module, a power supply circuit, a master control circuit, a voice reminding circuit, an LED reminding circuit, a charging control circuit and a discharging control circuit; The battery module is electrically connected with the power supply circuit, the charging control circuit, the discharging control circuit and the LED reminding circuit, the power supply circuit is also electrically connected with the master control circuit and the voice reminding circuit, the master control circuit is also electrically connected with the voice reminding circuit, the LED reminding circuit, the charging control circuit and the discharging control circuit, and the discharging control circuit is also electrically connected with an external motor and brush; The voice reminding circuit comprises a voice chip, a speaker, a polar capacitor PC3, a polar capacitor PC15 and a resistor R103; The voltage stabilizing pin VREG and the PWM signal positive pin PWM+ of the voice chip are electrically connected with the master control circuit, the PWM signal negative pin PWM- and the power input pin VDD of the voice chip are left floating, the first data input / output pin IO1 of the voice chip is electrically connected with the power supply circuit, the positive pole of the polar capacitor PC3 and the positive pole of the polar capacitor PC15 are connected together on a common connection terminal between the first data input / output pin IO1 of the voice chip and the power supply circuit, the negative pole of the polar capacitor PC3 and the negative pole of the polar capacitor PC15 are grounded, the signal output pin OK1 of the voice chip is electrically connected with the positive pole of the speaker through the resistor R103, and the grounding pin GND of the voice chip is electrically connected with the negative pole of the speaker.

2. The battery pack with a voice reminding function according to claim 1, characterized in that, The LED reminding circuit comprises a first light emitting diode, a second light emitting diode, a resistor R143 and a resistor R144; The positive poles of the first light emitting diode and the second light emitting diode are connected together and electrically connected with the battery module, the negative pole of the first light emitting diode is electrically connected with the master control circuit through the resistor R143, and the negative pole of the second light emitting diode is electrically connected with the master control circuit through the resistor R144. 3.The battery pack with voice reminding function according to claim 1, characterized in that, The battery pack further comprises an interface circuit; The battery module is electrically connected with the power supply circuit, the charging control circuit, the discharging control circuit and the LED reminding circuit through the interface circuit, and the discharging control circuit is electrically connected with the motor and the brush through the interface circuit. 4.The battery pack with voice reminding function according to claim 3, characterized in that, The charging control circuit comprises a triode QP1, a triode QP2, a triode QF2, a MOS tube QF7, a diode D12, a resistor R118, a resistor R119, a resistor R145, a resistor R131 and a first row resistor; The first row resistor is composed of a resistor RN4A, a resistor RN4B, a resistor RN4C and a resistor RN4D, the second end of the resistor RN4A is connected together with the first end of the resistor RN4B, and the second end of the resistor RN4C is connected together with the first end of the resistor RN4D. The positive electrode of the diode D12 is electrically connected with the interface circuit, the negative electrode of the diode D12 is electrically connected with the emitter of the triode QP1, and the negative electrode of the diode D12 is also electrically connected with the first end of the resistor RN4A; the second end of the resistor RN4B is electrically connected with the collector of the triode QP1 through the resistor R131, and the base of the triode QP1 is connected to the common connection end between the second end of the resistor RN4A and the first end of the resistor RN4B; The base of the triode QP1 is also electrically connected with the collector of the triode QF2; the first end of the resistor RN4C is electrically connected with the main control circuit, the second end of the resistor RN4D is grounded, and the second end of the resistor RN4D is also electrically connected with the emitter of the triode QF2; the base of the triode QF2 is connected to the common connection end between the second end of the resistor RN4C and the first end of the resistor RN4D; The collector of the triode QP2 is electrically connected with the interface circuit, the collector of the triode QP1 is also electrically connected with the emitter of the triode QP2, and the collector of the triode QP1 is also electrically connected with the base of the triode QP2 through the resistor R118; the first end of the resistor R119 is connected to the common connection end between the resistor R118 and the base of the triode QP2, and the second end of the resistor R119 is electrically connected with the drain of the MOS tube QF7; the first end of the resistor R145 is connected to the common connection end between the resistor R118 and the base of the triode QP2, the second end of the resistor R119 is electrically connected with the gate of the MOS tube QF7, and the source of the MOS tube QF7 is grounded. 5.The battery pack with voice reminding function according to claim 3, characterized in that, The discharge control circuit comprises a brush power supply control circuit and a motor power supply control circuit; The battery pack module is electrically connected with the brush power supply control circuit and the motor power supply control circuit through the interface circuit, the brush power supply control circuit is also electrically connected with the brush through the interface circuit, the motor power supply control circuit is also electrically connected with the motor through the interface circuit, and the brush power supply control circuit and the motor power supply control circuit are both electrically connected with the main control circuit. 6.The battery pack with voice reminding function according to claim 5, characterized in that, The brush power supply control circuit comprises a MOS tube QF8, a fuse FU4, a diode D11, a polar capacitor C26, a polar capacitor C27, a resistor R14, a resistor R38, a resistor R97, a resistor R98 and a resistor R99; The gate of the MOS tube QF8 is electrically connected with the main control circuit through the resistor R99, the gate of the MOS tube QF8 is also electrically connected with the source of the MOS tube QF8 through the resistor R38, the source of the MOS tube QF8 is electrically connected with the main control circuit through the resistor R98, the source of the MOS tube QF8 is also grounded through the resistor R97, the positive electrode of the polar capacitor C27 is connected to the common connection end between the resistor R98 and the main control circuit, and the negative electrode of the polar capacitor C27 is grounded. The positive pole of the polarized capacitor C26 is electrically connected with the source pole of the MOS tube QF8, and the negative pole of the polarized capacitor C26 is electrically connected with the drain pole of the MOS tube QF8 through the first end of the resistor R14; the drain pole of the MOS tube QF8 is further electrically connected with the brush through the fuse FU4 and the interface circuit in sequence, and the drain pole of the MOS tube QF8 is further electrically connected with the battery module through the diode D11 and the interface circuit in sequence. 7.The battery pack with voice reminding function according to claim 5, characterized in that, The motor power supply control circuit comprises a MOS tube MQ3, a diode D6, a polarized capacitor C22, a polarized capacitor C24, a resistor R30, a resistor R47, a resistor R49, a resistor R57 and a resistor R96; The gate pole of the MOS tube MQ3 is electrically connected with the main control circuit through the resistor R57, the first end of the resistor R30 is connected to the common connection end between the resistor R57 and the main control circuit, and the second end of the resistor R30 is electrically connected with the source pole of the MOS tube MQ3; the first end of the resistor R96 and the first end of the resistor R49 are both connected to the common connection end between the second end of the resistor R30 and the source pole of the MOS tube MQ3, the second end of the resistor R96 is grounded, and the second end of the resistor R49 is electrically connected with the main control circuit; the positive pole of the polarized capacitor C22 is connected to the common connection end between the second end of the resistor R49 and the main control circuit, and the negative pole of the polarized capacitor C22 is grounded; The drain pole of the MOS tube MQ3 is electrically connected with the battery module through the diode D6 and the interface circuit, and the drain pole of the MOS tube MQ3 is further electrically connected with the motor through the interface circuit, the first end of the resistor R47 is connected to the common connection end between the drain pole of the MOS tube MQ3 and the interface circuit, and the second end of the resistor R47 is connected to the common connection end between the second end of the resistor R30 and the source pole of the MOS tube MQ3 through the polarized capacitor C24. 8.The battery pack with voice reminding function according to claim 3, characterized in that, The power supply circuit comprises a voltage conversion chip, a triode Q1, a triode QF1, a common cathode diode D10, a diode D17, a diode D18, an inductor PL1, a polarized capacitor C3, a polarized capacitor C7, a polarized capacitor C89, a polarized capacitor PC5, a polarized capacitor PC6, a polarized capacitor PC8, a polarized capacitor PC9, a polarized capacitor PC13, a polarized capacitor PC14, a resistor R52, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R117, a resistor R128, a resistor R129, a resistor R130, a resistor PR6, a resistor PR7 and a second row resistor; The first end of the resistor RN1A and the second end of the resistor RN1B are connected together, the first end of the resistor RN4C and the first end of the resistor RN1D are connected together, and the second end of the resistor RN4C is connected to the first end of the resistor R130. The emitter of the triode Q1 is electrically connected with the interface circuit, and the emitter of the triode Q1 is also electrically connected with the second end of the resistor RN1A; the base of the triode Q1 is connected on the common connection end between the first end of the resistor RN1A and the second end of the resistor RN1B; the first end of the resistor RN1B is electrically connected with the first anode of the common cathode diode D10, the second anode of the common cathode diode D10 is electrically connected with the master control circuit, the first end of the resistor R52 and the positive pole of the polar capacitor C3 are both connected on the common connection end between the second anode of the common cathode diode D10 and the master control circuit, the second end of the resistor R52 is also directly electrically connected with the master control circuit, and the negative pole of the polar capacitor C3 is grounded; the cathode of the common cathode diode D10 is electrically connected with the interface circuit; the first end of the resistor RN1B is also electrically connected with the collector of the triode QF1 through the resistor R130, the base of the triode QF1 is connected on the common connection end between the first end of the resistor RN4C and the first end of the resistor RN1D, the second end of the resistor RN1D is electrically connected with the master control circuit, the second end of the resistor RN4C is electrically connected with the emitter of the triode QF1; the emitter of the triode QF1 is also grounded; The collector of the triode Q1 is grounded in sequence through the resistor R7 and the resistor R9, and the master control circuit is also electrically connected with the common connection end between the resistor R7 and the resistor R9; the collector of the triode Q1 is also electrically connected with the first end of the resistor R5 through the diode D17, the first end of the resistor R117 is connected with the first end of the resistor R5 together, the second end of the resistor R117 is connected with the second end of the resistor R5 together and is electrically connected with the VCC power supply end; the negative pole of the diode D18 is connected on the common connection end between the first end of the resistor R117 and the first end of the resistor R5, the positive pole of the diode D18 is electrically connected with the interface circuit, and the positive pole of the diode D18 is also grounded in sequence through the resistor R8 and the resistor R10; the positive pole of the polar capacitor C7 is connected on the common connection end between the resistor R8 and the resistor R10, and the negative pole of the polar capacitor C7 is grounded; the master control circuit is also electrically connected with the common connection end between the resistor R8 and the resistor R10; The power input pin VIN of the voltage conversion chip is electrically connected with the VCC power supply end, and the power input pin VIN of the voltage conversion chip is also electrically connected with the enable pin EN of the voltage conversion chip through the resistor R128; the positive pole of the polar capacitor PC5 and the positive pole of the polar capacitor PC6 are both connected on the common connection end between the power input pin VIN of the voltage conversion chip and the resistor R128, and the negative pole of the polar capacitor PC5 and the negative pole of the polar capacitor PC6 are both grounded; the ground pin GND of the voltage conversion chip is grounded; The boost capacitor pin BOOT of the voltage conversion chip is electrically connected with the negative pole of the polarized capacitor C89, the switch output pin SW of the voltage conversion chip is electrically connected with the positive pole of the polarized capacitor C89, the switch output pin SW of the voltage conversion chip is further electrically connected with the negative pole of the polarized capacitor PC14 through the resistor R129, and the positive pole of the polarized capacitor PC14 is grounded; the switch output pin SW of the voltage conversion chip is further electrically connected with the main control circuit through the inductor PL1; the first end of the resistor PR6, the positive pole of the polarized capacitor PC13, the positive pole of the polarized capacitor PC8 and the positive pole of the polarized capacitor PC9 are all connected on the common connection end between the inductor PL1 and the main control circuit, the second end of the resistor PR6 and the negative pole of the polarized capacitor PC13 are connected together and electrically connected with the feedback pin FB of the voltage conversion chip, and the negative pole of the polarized capacitor PC8 and the negative pole of the polarized capacitor PC9 are both grounded; the first end of the resistor PR7 is connected on the common connection end between the second end of the resistor PR6 and the negative pole of the polarized capacitor PC13, and the second end of the resistor PR7 is grounded.

9. A power tool characterized by comprising: The battery pack with voice reminding function comprises a battery pack with voice reminding function as claimed in any one of claims 1 to 8, a motor and a brush. The battery pack with voice reminding function is electrically connected with the motor and the brush.

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