Brushless motor application circuit of bean grinder

Abstract

The utility model relates to a brushless motor application circuit of a bean grinder, which comprises a master control MCU, a power supply module, a phase line driving module and an LED indication module, the power supply module is connected with the master control MCU, the phase line driving module and the LED indication module, the phase line driving module is connected with the master control MCU, the LED indication module is connected with the master control MCU, the phase line driving module comprises a U-phase driving circuit and a V-phase driving circuit, and the U-phase driving circuit is connected with the V-phase driving circuit. The input end of the U-phase driving circuit is connected with a U-phase PWM interface of the main control MCU, the input end of the V-phase driving circuit is connected with a V-phase PWM interface of the main control MCU, the output end of the U-phase driving circuit is connected with a pin 1 of the brushless motor connector, and the output end of the V-phase driving circuit is connected with a pin 2 of the brushless motor connector. The high-efficiency performance of the brushless motor enables the working efficiency of the bean grinder to be remarkably improved, the grinding time is shortened, the production efficiency is improved, stable control over the bean grinder is achieved, and the product quality and the percent of pass are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household electrical appliance circuits, in particular to a brushless motor application circuit for a coffee bean grinder. Background Art

[0002] Existing coffee grinders driven by brush motors have the following problems during use. Due to deficiencies in the mechanical structure design, brush motors wear and lose quickly, resulting in a relatively short motor life; frequent maintenance and replacement not only increase costs, but also affect production efficiency; during operation, brush motors will generate loud noises due to mechanical friction and commutation sparks, affecting the comfort of the operating environment and possibly causing damage to the operator's hearing; under low speed and high load conditions, brush motors are prone to unstable control, resulting in uneven grinding of the grinder, affecting product quality; the electric sparks generated by brush motors during commutation may interfere with other electronic equipment, causing signal distortion or equipment failure, especially in situations that are sensitive to electromagnetic interference, this problem is particularly prominent; traditional grinders are usually powered by AC, which poses electrical safety hazards, such as risks of electric shock and fire. Utility Model Content

[0003] The utility model provides a brushless motor application circuit for a coffee bean grinder, aiming to solve the problems of short life, high noise, unstable performance, electric spark interference and potential safety hazards in the use of a traditional coffee bean grinder driven by a brush motor.

[0004] The utility model provides a brushless motor application circuit of a coffee bean grinder, comprising a main control MCU, a power supply module, a phase line drive module and an LED indication module, wherein the power supply module is connected to the main control MCU, the phase line drive module and the LED indication module, the phase line drive module is connected to the main control MCU, the LED indication module is connected to the main control MCU, the phase line drive module comprises a U-phase drive circuit and a V-phase drive circuit, the input end of the U-phase drive circuit is connected to the U-phase PWM interface of the main control MCU, the input end of the V-phase drive circuit is connected to the V-phase PWM interface of the main control MCU, the output end of the U-phase drive circuit is connected to pin 1 of a brushless motor connector, and the output end of the V-phase drive circuit is connected to pin 2 of the brushless motor connector.

[0005] As a further improvement of the present utility model, the power supply module includes a charging circuit, a battery circuit, an MCU power supply circuit and a standby zero power consumption circuit. The charging circuit is connected to an external power supply, the battery circuit and the MCU power supply circuit are respectively connected to the charging circuit, the MCU power supply circuit is connected to the main control MCU, and the standby zero power consumption circuit is connected to the battery circuit.

[0006] As a further improvement of the utility model, the charging circuit includes a power interface J1, a transistor Q1, a field effect transistor Q2, a transistor Q3 and an inductor L1, pin 1 of the power interface J1 is grounded, pin 2 of the power interface J1 is connected to the positive electrode of the diode D1, the positive electrode of the diode D3 is connected to pin 2 of the power interface J1, the negative electrode of the diode D3 is connected to the negative electrode of the diode D1, the positive electrode of the diode D11 is connected to pin 2 of the power interface J1, pin 2 of the power interface J1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to pin 26 of the main control MCU, the negative electrode of the diode D11 is connected to the positive electrode of the field effect transistor Q2 The source is connected, the drain of the field effect transistor Q2 is connected to the negative electrode of the diode D6, the positive electrode of the diode D6 is grounded, one end of the inductor L1 is connected to the drain of the field effect transistor Q2, the gate of the field effect transistor Q2 is connected to the positive electrode of the diode D7, the negative electrode of the diode D7 is connected to the collector of the transistor Q3, the collector of the transistor Q1 is connected to the negative electrode of the diode D11, the base of the transistor Q1 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the negative electrode of the diode D7, the positive electrode of the diode D7 is connected to the emitter of the transistor Q1, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to pin 5 of the main control MCU.

[0007] As a further improvement of the present utility model, the MCU power supply circuit includes a voltage stabilizing chip U1 and a voltage stabilizing chip U3, pin 3 of the voltage stabilizing chip U3 is connected to the cathode of the diode D1, pin 1 of the voltage stabilizing chip U3 is connected to pin 2 of the voltage stabilizing chip U1, pin 3 of the voltage stabilizing chip U1 outputs a 3.3V voltage, and pin 1 of the voltage stabilizing chip U3 outputs a 12V voltage.

[0008] As a further improvement of the utility model, the battery circuit includes a battery connector P1 and a field effect transistor Q4, the drain of the field effect transistor Q4 is connected to the positive electrode of the diode D5, the cathode of the diode D5 is connected to the cathode of the diode D1, the drain of the field effect transistor Q4 is connected to the other end of the inductor L1, the source of the field effect transistor Q4 is connected to pin 1 of the battery connector P1, and pin 3 of the battery connector P1 is grounded.

[0009] As a further improvement of the utility model, the standby zero power consumption circuit includes a field effect tube Q5 and a field effect tube Q6, one end of the resistor R127 is connected to the gate of the field effect tube Q4, the drain of the field effect tube Q5 is connected to the other end of the resistor R127, the gate of the field effect tube Q5 is connected to the LED indication module, the drain of the field effect tube Q6 is connected to the other end of the resistor R127, the gate of the field effect tube Q6 is connected to pin 11 of the main control MCU, the source of the field effect tube Q5 and the source of the field effect tube Q6 are both grounded, one end of the resistor R45 is connected to the gate of the field effect tube Q5, and the other end of the resistor R45 is connected to pin 8 of the main control MCU.

[0010] As a further improvement of the present invention, the pin 27 of the main control MCU is connected to the other end of the inductor L1, and the pin 16 of the main control MCU is connected to the drain of the field effect transistor Q4.

[0011] As a further improvement of the utility model, the U-phase drive circuit includes a drive chip U4, pin 2 of the drive chip U4 is connected to pin 15 of the main control MCU, pin 3 of the drive chip U4 is connected to pin 24 of the main control MCU, pin 7 of the drive chip U4 is connected to the gate of the field effect tube V1, pin 6 of the drive chip U4 is connected to pin 1 of the brushless motor connector, pin 5 of the drive chip U4 is connected to the gate of the field effect tube V2, the drain of the field effect tube V2 is connected to the source of the field effect tube V1, and the source of the field effect tube V2 is connected to the signal ground; the V-phase drive circuit includes a drive chip U5, a drive chip U6, a drive chip U7, a drive chip U8, a drive chip U9, a drive chip U10, a drive chip U11, a drive chip U12, a drive chip U13, a drive chip U14, a drive chip U15, a drive chip U16, a drive chip U17, a drive chip U18, a drive chip U19, a drive chip U20, a drive chip U21, a drive chip U22 Pin 2 of the driver chip U5 is connected to pin 13 of the main control MCU, pin 3 of the driver chip U5 is connected to pin 23 of the main control MCU, pin 7 of the driver chip U4 is connected to the gate of the field effect transistor V3, pin 6 of the driver chip U5 is connected to pin 2 of the brushless motor connector, pin 5 of the driver chip U5 is connected to the gate of the field effect transistor V4, the drain of the field effect transistor V4 is connected to the source of the field effect transistor V3, the source of the field effect transistor V4 is connected to the signal ground, the drain of the field effect transistor V1 and the drain of the field effect transistor V3 are both connected to the voltage VCC, and pin 17 of the main control MCU is connected to the source of the field effect transistor V4.

[0012] As a further improvement of the utility model, the LED indication module includes an indication chip SW1, a transistor Q7 and a connector J5, pin 10 of the main control MCU is connected to the base of the transistor Q7, the emitter of the transistor Q7 is grounded, the collector of the transistor Q7 is connected to pin 4 of the indication chip SW1, pin 1 of the indication chip SW1 is connected to pin 4 of the connector J5, pin 2 of the indication chip SW1 is connected to pin 1 of the connector J5, pin 3 of the indication chip SW1 is connected to pin 3 of the connector J5, and pin 4 of the indication chip SW1 is connected to pin 2 of the connector J5.

[0013] As a further improvement of the utility model, it also includes a temperature monitoring module, which is connected to the main control MCU. The temperature monitoring module includes a common terminal P7 and a common terminal P8. The common terminal P7 is connected to pin 14 of the main control MCU, one end of the resistor R26 is connected to the common terminal P7, the other end of the resistor R26 is connected to the common terminal P8, and the other end of the resistor R26 is grounded.

[0014] The beneficial effects of the utility model are: the high-efficiency performance of the brushless motor significantly improves the working efficiency of the coffee grinder, shortens the grinding time, and improves production efficiency. Through precise control algorithms and logic, stable control of the coffee grinder is achieved, avoiding the problem of uneven grinding effect caused by motor fluctuations, and improving product quality and pass rate. The low noise characteristics of the brushless motor make the operating environment more comfortable, reduce hearing damage to operators, and also help to improve the user experience. The long life of the brushless motor reduces the frequency of maintenance and replacement, reduces maintenance costs, and improves the overall economic benefits of the equipment. The use of advanced power supply technology and signal acquisition technology improves the safety of the coffee grinder, reduces electrical safety hazards, and ensures safe use by users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a connection relationship diagram between various modules of the utility model;

[0016] Figure 2 It is a specific circuit connection diagram of the main control MCU of the utility model;

[0017] Figure 3 It is a specific circuit connection diagram of the power supply module of the utility model;

[0018] Figure 4 It is a specific circuit connection diagram of the phase line drive module of the utility model;

[0019] Figure 5 It is a specific circuit connection diagram of the LED indicator module of the utility model;

[0020] Figure 6 It is a specific circuit connection diagram of the temperature monitoring module of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1As shown, the utility model provides a brushless motor application circuit for a coffee bean grinder, including a main control MCU, a power supply module, a phase line drive module and an LED indication module, the power supply module is connected to the main control MCU, the phase line drive module and the LED indication module, the phase line drive module is connected to the main control MCU, the LED indication module is connected to the main control MCU, the phase line drive module includes a U-phase drive circuit and a V-phase drive circuit, the input end of the U-phase drive circuit is connected to the U-phase PWM interface of the main control MCU, the input end of the V-phase drive circuit is connected to the V-phase PWM interface of the main control MCU, the output end of the U-phase drive circuit is connected to pin 1 of the brushless motor connector, and the output end of the V-phase drive circuit is connected to pin 2 of the brushless motor connector.

[0023] As an embodiment of the utility model, the power supply module includes a charging circuit, a battery circuit, an MCU power supply circuit and a standby zero power consumption circuit. The charging circuit is connected to an external power supply, the battery circuit and the MCU power supply circuit are respectively connected to the charging circuit, the MCU power supply circuit is connected to the main control MCU, and the standby zero power consumption circuit is connected to the battery circuit.

[0024] As another embodiment of the utility model, the charging circuit includes a power interface J1, a transistor Q1, a field effect transistor Q2, a transistor Q3 and an inductor L1, pin 1 of the power interface J1 is grounded, pin 2 of the power interface J1 is connected to the positive electrode of the diode D1, the positive electrode of the diode D3 is connected to pin 2 of the power interface J1, the negative electrode of the diode D3 is connected to the negative electrode of the diode D1, the positive electrode of the diode D11 is connected to pin 2 of the power interface J1, pin 2 of the power interface J1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to pin 26 of the main control MCU, the negative electrode of the diode D11 is connected to the positive electrode of the field effect transistor Q2 The source is connected, the drain of the field effect transistor Q2 is connected to the negative electrode of the diode D6, the positive electrode of the diode D6 is grounded, one end of the inductor L1 is connected to the drain of the field effect transistor Q2, the gate of the field effect transistor Q2 is connected to the positive electrode of the diode D7, the negative electrode of the diode D7 is connected to the collector of the transistor Q3, the collector of the transistor Q1 is connected to the negative electrode of the diode D11, the base of the transistor Q1 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the negative electrode of the diode D7, the positive electrode of the diode D7 is connected to the emitter of the transistor Q1, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to pin 5 of the main control MCU.

[0025] As another embodiment of the utility model, the MCU power supply circuit includes a voltage stabilizing chip U1 and a voltage stabilizing chip U3, pin 3 of the voltage stabilizing chip U3 is connected to the cathode of the diode D1, pin 1 of the voltage stabilizing chip U3 is connected to pin 2 of the voltage stabilizing chip U1, pin 3 of the voltage stabilizing chip U1 outputs a 3.3V voltage, and pin 1 of the voltage stabilizing chip U3 outputs a 12V voltage.

[0026] As another embodiment of the utility model, the battery circuit includes a battery connector P1 and a field effect transistor Q4, the drain of the field effect transistor Q4 is connected to the positive electrode of the diode D5, the cathode of the diode D5 is connected to the cathode of the diode D1, the drain of the field effect transistor Q4 is connected to the other end of the inductor L1, the source of the field effect transistor Q4 is connected to pin 1 of the battery connector P1, and pin 3 of the battery connector P1 is grounded.

[0027] As another embodiment of the utility model, the standby zero power consumption circuit includes a field effect transistor Q5 and a field effect transistor Q6, one end of the resistor R127 is connected to the gate of the field effect transistor Q4, the drain of the field effect transistor Q5 is connected to the other end of the resistor R127, the gate of the field effect transistor Q5 is connected to the LED indication module, the drain of the field effect transistor Q6 is connected to the other end of the resistor R127, the gate of the field effect transistor Q6 is connected to pin 11 of the main control MCU, the source of the field effect transistor Q5 and the source of the field effect transistor Q6 are both grounded, one end of the resistor R45 is connected to the gate of the field effect transistor Q5, and the other end of the resistor R45 is connected to pin 8 of the main control MCU.

[0028] As another embodiment of the present utility model, the pin 27 of the main control MCU is connected to the other end of the inductor L1, and the pin 16 of the main control MCU is connected to the drain of the field effect transistor Q4.

[0029] In the power supply module, the battery is charged through an adapter, and the main control MCU monitors the battery's voltage, current, temperature and other parameters in real time through the VBAT terminal and the CURRENT terminal to achieve precise control of the charging process and avoid damage to the battery caused by overcharging or over-discharging. An efficient and stable lithium battery power supply system is adopted to ensure that the grinder can obtain a continuous and stable power supply when working. The MCU power supply circuit provides power to the main control MCU. At the same time, the standby zero-power circuit is set in the battery circuit. When the grinder is on standby, it can reduce energy consumption and extend the battery life. At the same time, overcharge and over-discharge protection functions are provided to ensure the battery life and safety. Among them, the voltage regulator chip U1 model adopts RS3005-3.3YE3L, which outputs 3.3V voltage, and the voltage regulator chip U3 model adopts CE6601A120PT, which outputs 12V voltage. The specific circuit of the power supply module is as follows Figure 3 shown.

[0030] The specific circuit of the main control MCU is as follows Figure 2 As shown in the figure. The main control MCU is the core of the entire circuit. It realizes precise control of the grinder through built-in advanced control algorithms and logic. The module can flexibly adjust the motor speed and power according to different grinding requirements to ensure the uniformity and consistency of the grinding effect. The chip model of the main control MCU is MT32F006QFN28.

[0031] As another embodiment of the utility model, the U-phase drive circuit includes a drive chip U4, pin 2 of the drive chip U4 is connected to pin 15 of the main control MCU, pin 3 of the drive chip U4 is connected to pin 24 of the main control MCU, pin 7 of the drive chip U4 is connected to the gate of the field effect tube V1, pin 6 of the drive chip U4 is connected to pin 1 of the brushless motor connector, pin 5 of the drive chip U4 is connected to the gate of the field effect tube V2, the drain of the field effect tube V2 is connected to the source of the field effect tube V1, and the source of the field effect tube V2 is connected to the signal ground; the V-phase drive circuit includes a drive chip U5, a drive chip U6, a drive chip U7, a drive chip U8, a drive chip U9, a drive chip U10, a drive chip U11, a drive chip U12, a drive chip U13, a drive chip U14, a drive chip U15, a drive chip U16, a drive chip U17, a drive chip U18, a drive chip U19, a drive chip U20, a drive chip U21, a drive chip U22 Pin 2 of the driver chip U5 is connected to pin 13 of the main control MCU, pin 3 of the driver chip U5 is connected to pin 23 of the main control MCU, pin 7 of the driver chip U4 is connected to the gate of the field effect transistor V3, pin 6 of the driver chip U5 is connected to pin 2 of the brushless motor connector, pin 5 of the driver chip U5 is connected to the gate of the field effect transistor V4, the drain of the field effect transistor V4 is connected to the source of the field effect transistor V3, the source of the field effect transistor V4 is connected to the signal ground, the drain of the field effect transistor V1 and the drain of the field effect transistor V3 are both connected to the voltage VCC, and pin 17 of the main control MCU is connected to the source of the field effect transistor V4.

[0032] It uses advanced brushless motor drive technology to achieve precise control of the motor. The module controls the operation of the motor through the phase line driver chip, which has the characteristics of fast response speed and high control accuracy, and significantly improves the working efficiency and stability of the grinder. The driver chip U4 receives the PWM modulation signal of the brushless motor U phase from the main control MCU, and the driver chip U5 receives the PWM modulation signal of the brushless motor V phase from the main control MCU to drive the brushless motor to rotate. The main control MCU also monitors the speed of the brushless motor in real time through the CURRENT1 terminal to ensure that the speed of the brushless motor is consistent with the setting, so as to achieve dynamic adjustment. The models of the driver chip U4 and the driver chip U5 are both FD2103. The specific circuit of the phase line driver module is as follows: Figure 4 shown.

[0033] As another embodiment of the utility model, the LED indication module includes an indication chip SW1, a transistor Q7 and a connector J5, pin 10 of the main control MCU is connected to the base of the transistor Q7, the emitter of the transistor Q7 is grounded, the collector of the transistor Q7 is connected to pin 4 of the indication chip SW1, pin 1 of the indication chip SW1 is connected to pin 4 of the connector J5, pin 2 of the indication chip SW1 is connected to pin 1 of the connector J5, pin 3 of the indication chip SW1 is connected to pin 3 of the connector J5, and pin 4 of the indication chip SW1 is connected to pin 2 of the connector J5.

[0034] In the LED indicator module, the LED lamp is lit by the indicator chip SW1, and the LED lamp is provided with an indicator light to indicate the status of power on / off, operation, charging, etc., which is convenient for users to operate and maintain. Figure 5 shown.

[0035] As another embodiment of the utility model, it also includes a temperature monitoring module, which is connected to the main control MCU, and includes a common terminal P7 and a common terminal P8, the common terminal P7 is connected to the 14 pin of the main control MCU, one end of the resistor R26 is connected to the common terminal P7, the other end of the resistor R26 is connected to the common terminal P8, and the other end of the resistor R26 is grounded. The specific circuit of the temperature monitoring module is as follows Figure 6 shown.

[0036] The temperature monitoring module and other monitoring circuits collect the working status signals of the grinder in real time, including key parameters such as voltage, current, temperature, speed, etc., and process and analyze them. These signal data provide important reference basis for the main control MCU, which helps to achieve more accurate control and more optimized performance.

[0037] This utility model is dedicated to the in-depth application of brushless motor technology, and especially for the field of coffee bean grinders, an innovative brushless motor application control circuit is designed. This circuit solves many common problems of traditional brushed motors in coffee bean grinder applications, and significantly improves the performance, stability and reliability of coffee bean grinders. It not only optimizes the operating efficiency of the coffee bean grinder, but also brings great convenience to users in operation. Whether it is a place where coffee beans need to be ground, such as a home, a cafe or a restaurant, this utility model will play an important role and bring revolutionary changes to the use of coffee bean grinders.

[0038] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A brushless motor application circuit for a coffee grinder, characterized in that: It includes a main control MCU, a power supply module, a phase line drive module and an LED indication module, the power supply module is connected to the main control MCU, the phase line drive module and the LED indication module, the phase line drive module is connected to the main control MCU, the LED indication module is connected to the main control MCU, the phase line drive module includes a U-phase drive circuit and a V-phase drive circuit, the input end of the U-phase drive circuit is connected to the U-phase PWM interface of the main control MCU, the input end of the V-phase drive circuit is connected to the V-phase PWM interface of the main control MCU, the output end of the U-phase drive circuit is connected to pin 1 of the brushless motor connector, and the output end of the V-phase drive circuit is connected to pin 2 of the brushless motor connector.

2. The brushless motor application circuit of a coffee grinder according to claim 1, characterized in that: The power supply module includes a charging circuit, a battery circuit, an MCU power supply circuit and a standby zero power consumption circuit. The charging circuit is connected to an external power supply, the battery circuit and the MCU power supply circuit are respectively connected to the charging circuit, the MCU power supply circuit is connected to the main control MCU, and the standby zero power consumption circuit is connected to the battery circuit.

3. The brushless motor application circuit of a coffee grinder according to claim 2, characterized in that: The charging circuit includes a power interface J1, a transistor Q1, a field effect transistor Q2, a transistor Q3 and an inductor L1. Pin 1 of the power interface J1 is grounded, pin 2 of the power interface J1 is connected to the positive electrode of the diode D1, the positive electrode of the diode D3 is connected to pin 2 of the power interface J1, the negative electrode of the diode D3 is connected to the negative electrode of the diode D1, the positive electrode of the diode D11 is connected to pin 2 of the power interface J1, pin 2 of the power interface J1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to pin 26 of the main control MCU, the negative electrode of the diode D11 is connected to the source of the field effect transistor Q2, and the field effect The drain of transistor Q2 is connected to the cathode of diode D6, the anode of diode D6 is grounded, one end of inductor L1 is connected to the drain of field effect transistor Q2, the gate of field effect transistor Q2 is connected to the anode of diode D7, the cathode of diode D7 is connected to the collector of transistor Q3, the collector of transistor Q1 is connected to the cathode of diode D11, the base of transistor Q1 is connected to one end of resistor R6, the other end of resistor R6 is connected to the cathode of diode D7, the anode of diode D7 is connected to the emitter of transistor Q1, the emitter of transistor Q3 is grounded, and the base of transistor Q3 is connected to pin 5 of the main control MCU.

4. The brushless motor application circuit of a coffee grinder according to claim 3, characterized in that: The MCU power supply circuit includes a voltage stabilizing chip U1 and a voltage stabilizing chip U3. Pin 3 of the voltage stabilizing chip U3 is connected to the cathode of the diode D1. Pin 1 of the voltage stabilizing chip U3 is connected to pin 2 of the voltage stabilizing chip U1. Pin 3 of the voltage stabilizing chip U1 outputs a 3.3V voltage, and pin 1 of the voltage stabilizing chip U3 outputs a 12V voltage.

5. The brushless motor application circuit of a coffee grinder according to claim 3, characterized in that: The battery circuit includes a battery connector P1 and a field effect transistor Q4, the drain of the field effect transistor Q4 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the cathode of the diode D1, the drain of the field effect transistor Q4 is connected to the other end of the inductor L1, the source of the field effect transistor Q4 is connected to pin 1 of the battery connector P1, and pin 3 of the battery connector P1 is grounded.

6. The brushless motor application circuit of a coffee bean grinder according to claim 5, characterized in that: The standby zero power consumption circuit includes a field effect tube Q5 and a field effect tube Q6, one end of a resistor R127 is connected to the gate of the field effect tube Q4, the drain of the field effect tube Q5 is connected to the other end of the resistor R127, the gate of the field effect tube Q5 is connected to the LED indication module, the drain of the field effect tube Q6 is connected to the other end of the resistor R127, the gate of the field effect tube Q6 is connected to pin 11 of the main control MCU, the source of the field effect tube Q5 and the source of the field effect tube Q6 are both grounded, one end of the resistor R45 is connected to the gate of the field effect tube Q5, and the other end of the resistor R45 is connected to pin 8 of the main control MCU.

7. The brushless motor application circuit of a coffee bean grinder according to claim 5, characterized in that: Pin 27 of the main control MCU is connected to the other end of the inductor L1, and pin 16 of the main control MCU is connected to the drain of the field effect transistor Q4.

8. The brushless motor application circuit of a coffee grinder according to claim 1, characterized in that: The U-phase driving circuit includes a driving chip U4, wherein pin 2 of the driving chip U4 is connected to pin 15 of the main control MCU, pin 3 of the driving chip U4 is connected to pin 24 of the main control MCU, pin 7 of the driving chip U4 is connected to the gate of the field effect tube V1, pin 6 of the driving chip U4 is connected to pin 1 of the brushless motor connector, pin 5 of the driving chip U4 is connected to the gate of the field effect tube V2, the drain of the field effect tube V2 is connected to the source of the field effect tube V1, and the source of the field effect tube V2 is connected to the signal ground; the V-phase driving circuit includes a driving chip U5, wherein pin 2 of the driving chip U5 is connected to the gate of the field effect tube V1, and the drain of the field effect tube V2 is connected to the source of the field effect tube V1, and the source of the field effect tube V2 is connected to the signal ground; The pin is connected to pin 13 of the main control MCU, pin 3 of the driver chip U5 is connected to pin 23 of the main control MCU, pin 7 of the driver chip U4 is connected to the gate of the field effect tube V3, pin 6 of the driver chip U5 is connected to pin 2 of the brushless motor connector, pin 5 of the driver chip U5 is connected to the gate of the field effect tube V4, the drain of the field effect tube V4 is connected to the source of the field effect tube V3, the source of the field effect tube V4 is connected to the signal ground, the drain of the field effect tube V1 and the drain of the field effect tube V3 are both connected to the voltage VCC, and pin 17 of the main control MCU is connected to the source of the field effect tube V4.

9. The brushless motor application circuit of a coffee grinder according to claim 1, characterized in that: The LED indication module includes an indication chip SW1, a transistor Q7 and a connector J5, wherein pin 10 of the main control MCU is connected to the base of the transistor Q7, the emitter of the transistor Q7 is grounded, the collector of the transistor Q7 is connected to pin 4 of the indication chip SW1, pin 1 of the indication chip SW1 is connected to pin 4 of the connector J5, pin 2 of the indication chip SW1 is connected to pin 1 of the connector J5, pin 3 of the indication chip SW1 is connected to pin 3 of the connector J5, and pin 4 of the indication chip SW1 is connected to pin 2 of the connector J5.

10. The brushless motor application circuit of a coffee grinder according to claim 1, characterized in that: It also includes a temperature monitoring module, which is connected to the main control MCU. The temperature monitoring module includes a common terminal P7 and a common terminal P8. The common terminal P7 is connected to the 14-pin of the main control MCU, one end of the resistor R26 is connected to the common terminal P7, the other end of the resistor R26 is connected to the common terminal P8, and the other end of the resistor R26 is grounded.

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