Multi-gear smoothie machine based on motor current regulation and control function

Abstract

The invention relates to the technical field of smoothie machines, in particular to a multi-gear smoothie machine based on a motor current regulation and control function, which comprises a main control module, a stirring module, an ice making module, a stirring detection module, an ice making detection module, a touch screen module and a power supply module, the stirring detection module, the ice-making detection module and the touch screen module are all in signal connection with the main control module, and the power supply module is used for supplying power. According to the invention, the stirring detection module and the ice-making detection module monitor the working current of the motor in real time, the main control module accurately regulates and controls the power of the stirring motor and the compressor motor according to feedback signals, a user can conveniently set different working gears through the touch screen module, and the practicability is higher.

Description

Technical Field

[0001] The invention relates to the technical field of ice smoothie machines, in particular to a multi-speed ice smoothie machine based on a motor current control function. Background Art

[0002] A smoothie machine is a small appliance specifically used to make ice drinks. It can mix ice cubes and liquid, break the ice cubes into small particles through high-speed rotating blades, and mix them with liquid to form smooth smoothies.

[0003] With the improvement of living standards, consumers have increasingly diversified requirements for the functions and performance of smoothie machines. During the mixing and ice-making process, traditional smoothie machines are often unable to flexibly adjust the motor power according to different ingredients and user needs, resulting in unstable ice-making effects, uneven mixing, and high energy consumption. At the same time, there is a lack of effective current detection and regulation mechanisms during motor operation, which can easily cause motor damage due to excessive current, shortening the service life of the equipment. In addition, the human-computer interaction method of traditional smoothie machines is relatively simple and cannot meet the needs of modern users for convenient operation and personalized settings. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-speed smoothie machine based on a motor current control function to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-speed smoothie machine based on motor current control function includes a main control module, a stirring module, an ice-making module, a stirring detection module, an ice-making detection module, a touch screen module and a power module. The stirring module and the ice-making module are electrically connected to the main control module, the stirring detection module, the ice-making detection module and the touch screen module are signal-connected to the main control module, and the power module is used to provide power.

[0007] Preferably, the main control module includes a main control chip U1, a +5V power supply, a resistor R1 and a capacitor C1;

[0008] The GND port of the main control chip U1 is grounded, the first end of the capacitor C1 is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the +5V power supply, and the VCC port of the main control chip U1 is connected to the second end of the capacitor C1.

[0009] Preferably, the stirring module includes a +10V power supply, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, a transistor Q1 and a stirring motor M1;

[0010] The first end of resistor R2 is connected to the P06 port of the main control chip U1, the second end of resistor R2 is connected to the base of transistor Q1, the first end of resistor R3 is connected to the base of transistor Q1, the second end of resistor R3 is grounded, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the second end of resistor R4, the first end of resistor R4 is connected to the +10V power supply, the first end of resistor R5 is connected to the second end of resistor R4, the second end of resistor R5 is connected to the first end of resistor R6, the second end of resistor R6 is connected to the speed control port of stirring motor M1, the first end of resistor R7 is connected to the P10 port of the main control chip U1, and the second end of resistor R7 is connected to the frequency detection port of stirring motor M1.

[0011] Preferably, the ice-making module includes a resistor R8, an optical coupler MOC3021, a resistor R9, a thyristor Q2, a compressor motor M2, an AC live wire ACL and an AC neutral wire ACN, and the model of the thyristor Q2 is BT136;

[0012] The first end of resistor R8 is connected to the P11 port of the main control chip U1, the resistor R8 is connected to the anode of the optocoupler MOC3021, the cathode of the optocoupler MOC3021 is grounded, the first end of the thyristor Q2 is connected to the AC live wire ACL, the second end of the thyristor Q2 is connected to the live wire port of the compressor motor M2, the control end of the thyristor Q2 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the second main port of the optocoupler MOC3021, the first main port of the optocoupler MOC3021 is connected to the second end of the thyristor Q2, and the neutral line port of the compressor motor M2 is connected to the AC neutral line ACN.

[0013] Preferably, the stirring detection module includes a +3.3V power supply, a resistor R10, a resistor R11, a resistor R12, a transistor Q3, a transistor Q4, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a transistor Q5, a transistor Q6 and a stirring detection unit PM50S;

[0014] The switch port of the stirring detection unit PM50S is connected to the P46 port of the main control chip U1. The stirring detection unit PM50S is used to detect the working current of the stirring motor M1;

[0015] The TX port of the stirring detection unit PM50S is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the second end of the resistor R10, the first end of the resistor R10 is connected to the +5V power supply, the first end of the resistor R11 is connected to the +5V power supply, the second end of the resistor R11 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the second end of the resistor R10, the emitter of the transistor Q4 is grounded, the first end of the resistor R12 is connected to the second end of the resistor R11, and the second end of the resistor R12 is connected to the P31 port of the main control chip U1;

[0016] The RX port of the stirring detection unit PM50S is connected to the first end of resistor R13, the second end of resistor R13 is connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, the first end of resistor R14 is connected to the +3.3V power supply, the second end of resistor R14 is connected to the collector of transistor Q5, the emitter of transistor Q5 is grounded, the base of transistor Q5 is connected to the second end of resistor R16, the first end of resistor R16 is connected to the P32 port of the main control chip U1, the first end of resistor R15 is connected to the +3.3V power supply, the second end of resistor R15 is connected to the collector of transistor Q6, and the base of transistor Q6 is connected to the second end of resistor R14.

[0017] Preferably, the ice making detection module includes a resistor R17, a resistor R18, a resistor R19, a transistor Q7, a transistor Q8, a resistor R44, a resistor R20, a resistor R21, a transistor Q9, a transistor Q10 and an ice making detection unit CPJK, and the ice making detection unit CPJK is used to detect the working current of the compressor motor M2;

[0018] The T port of the ice-making detection unit CPJK 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 the second end of the resistor R17, the first end of the resistor R17 is connected to the +5V power supply, the first end of the resistor R18 is connected to the +5V power supply, the second end of the resistor R18 is connected to the collector of the transistor Q8, the base of the transistor Q8 is connected to the second end of the resistor R17, the emitter of the transistor Q8 is grounded, the first end of the resistor R19 is connected to the second end of the resistor R18, and the second end of the resistor R19 is connected to the P26 port of the main control chip U1;

[0019] The R port of the ice making detection unit CPJK is connected to the collector of the transistor Q10, the emitter of the transistor Q10 is grounded, the first end of the resistor R44 is connected to the +3.3V power supply, the second end of the resistor R44 is connected to the base of the transistor Q10, the first end of the resistor R20 is connected to the +3.3V power supply, the second end of the resistor R20 is connected to the collector of the transistor Q10, the first end of the resistor R21 is connected to the P27 port of the main control chip U1, the second end of the resistor R21 is connected to the base of the transistor Q9, the collector of the transistor Q9 is connected to the second end of the resistor R44, and the transistor Q9 is grounded.

[0020] Preferably, the touch screen module includes a resistor R22, a resistor R23, a transceiver chip U2, a capacitor C3, a capacitor C4, a resistor R24, a resistor R25, a diode D1, a resistor R26, a resistor R27, a diode D2 and a socket CN2, wherein the diode D1 and the diode D2 are both voltage-stabilizing diodes, the socket CN2 is connected to a touch screen, and the model of the transceiver chip U2 is SP3485;

[0021] The first end of resistor R22 is connected to the P33 port of the main control chip U1, the second end of resistor R22 receives the RO port of the transceiver chip U2, the first end of resistor R23 is connected to the P34 port of the main control chip U1, the second end of resistor R23 receives the DI port of the transceiver chip U2, the RE port and the DE port of the transceiver chip U2 are connected to the +5V power supply, the first end of capacitor C3 is grounded, the second end of capacitor C3 is connected to the +5V power supply, the first end of capacitor C4 is grounded, the second end of capacitor C4 is connected to the +5V power supply, the VCC port of the transceiver chip U2 is connected to the +5V power supply, and the GND of the transceiver chip U2 The port is grounded, the B port of the transceiver chip U2 is connected to the first end of the resistor R25, the A port of the transceiver chip U2 is connected to the first end of the resistor R27, the second end of the resistor R25 and the second end of the resistor R27 are connected to different ports of the socket CN2, the first end of the resistor R24 ​​is grounded, the second end of the resistor R24 ​​is connected to the first end of the resistor R25, the first end of the diode D1 is grounded, the second end of the diode D1 is connected to the first end of the resistor R25, the first end of the resistor R26 is connected to the first end of the resistor R27, the second end of the resistor R26 is grounded, the first end of the diode D2 is connected to the first end of the resistor R27, and the second end of the diode D2 is grounded.

[0022] Preferably, the power module comprises a rectifier unit, a first step-down unit, a second step-down unit and a third step-down unit which are electrically connected in sequence, and the power module is used to provide power with different voltages.

[0023] Preferably, the rectifier unit includes a fuse F, a varistor ZR, a capacitor C5, a resistor R27, a resistor R28, a rectifier bridge, a capacitor C6, a filter LF and a capacitor C7;

[0024] A first end of the fuse F is connected to the AC live wire ACL, a first end of the varistor ZR is connected to the second end of the fuse F, a second end of the varistor ZR is connected to the AC neutral line ACN, a first end of the capacitor C5 is connected to the first end of the varistor ZR, a second end of the capacitor C5 is connected to the second end of the varistor ZR, a first end of the resistor R27 is connected to the first end of the capacitor C5, a second end of the resistor R27 is connected to the first end of the resistor R28, a second end of the resistor R28 is connected to the second end of the capacitor C5, two input ends of the rectifier bridge are respectively connected to the two ends of the capacitor C5, two output ends of the rectifier bridge are respectively connected to the two ends of the capacitor C6, a first end of the filter LF is connected to the first end of the capacitor C6, a third end of the filter LF is connected to the second end of the capacitor C6, a second end of the filter LF is connected to the first end of the capacitor C7, a fourth end of the filter LF is connected to the second end of the capacitor C7, and the second end of the capacitor C7 is grounded.

[0025] Preferably, the first step-down unit includes a resistor R29, a resistor R30, a capacitor C8, a capacitor C9, a resistor R31, a resistor R32, a resistor R33, a diode D3, a resistor R34, a diode D4, a control chip U3, a resistor R35, a resistor R36, a capacitor C12, an optical coupler 817, a resistor R39, a resistor R40, a first primary coil, a second primary coil, a secondary coil, a diode D5, a capacitor C10, a resistor R37, a capacitor C11, a resistor R38, a resistor R43, a capacitor C13, a resistor R41, a voltage regulator TL431 and a resistor R42, and the model of the control chip U3 is CR5269S;

[0026] The first terminal of resistor R29 is connected to the first end of capacitor C7, the second terminal of resistor R29 is connected to the first end of resistor R30, the second terminal of resistor R30 is connected to the first end of capacitor C8, the second end of capacitor C8 is grounded, the first terminal of capacitor C9 is connected to the first end of resistor R29, the first terminal of resistor R31 is connected to the first end of capacitor C9, the second terminal of resistor R31 is connected to the second end of capacitor C9, the first terminal of resistor R32 is connected to the first end of resistor R31, the second terminal of resistor R32 is connected to the second end of resistor R31, the first terminal of resistor R33 is connected to the second end of resistor R32, the first terminal of the first primary coil is connected to the first end of capacitor C7, the second terminal of the first primary coil is connected to the positive electrode of diode D3, and diode D3 The negative electrode is connected to the second end of the resistor R33, the first end of the second primary coil is connected to the positive electrode of the diode D4, the second end of the second primary coil is grounded, the negative electrode of the diode D4 is connected to the second end of the resistor R34, the first end of the resistor R34 is connected to the second end of the resistor R30, the VDD port of the control chip U3 is connected to the first end of the resistor R34, the GND port of the control chip U3 is grounded, the SENSE port of the control chip U3 is connected to the first end of the resistor R35, the second end of the resistor R35 is grounded, the first end of the resistor R36 is connected to the first end of the resistor R35, the second end of the resistor R36 is grounded, the DRAIN port of the control chip U3 is connected to the positive electrode of the diode D3, the first end of the secondary coil The positive electrode of the diode D5 is connected, the second end of the secondary coil is grounded, the negative electrode of the diode D5 is connected to the first end of the capacitor C11, the second end of the capacitor C11 is grounded, the first end of the resistor R38 is connected to the first end of the capacitor C11, the second end of the resistor R38 is grounded, the first end of the resistor R37 is connected to the positive electrode of the diode D5, the second end of the resistor R37 is connected to the first end of the capacitor C10, the second end of the capacitor C10 is connected to the negative electrode of the diode D5, the FB port of the control chip U3 is connected to the collector of the optocoupler 817, the emitter of the optocoupler 817 is grounded, the first end of the capacitor C12 is connected to the collector of the optocoupler 817, the second end of the capacitor C12 is grounded, the first end of the resistor R39 is connected to the negative electrode of the diode D5, The second end of resistor R39 is connected to the anode of optocoupler 817, the first end of resistor R40 is connected to the first end of resistor R39, the second end of resistor R40 is connected to the cathode of optocoupler 817, the first end of capacitor C13 is connected to the second end of resistor R40, the second end of capacitor C13 is connected to the first end of resistor R41, the second end of resistor R41 is connected to the second end of resistor R43, the first end of resistor R43 is connected to the cathode of diode D5, the anode of voltage regulator source TL431 is grounded, the cathode of voltage regulator source TL431 is connected to the second end of resistor R40, the reference pole of voltage regulator source TL431 is connected to the second end of resistor R43, the first end of resistor R42 is grounded, and the second end of resistor R42 is connected to the second end of resistor R43.

[0027] Preferably, the second step-down unit includes capacitor C16, capacitor C17, capacitor C18, capacitor C19 and voltage stabilizing chip U5, and the model is LM78M05;

[0028] The first end of capacitor C16 is connected to the cathode of diode D5, the second end of capacitor C16 is grounded, the first end of capacitor C17 is connected to the first end of capacitor C16, the second end of capacitor C17 is grounded, the VIN port of voltage regulator chip U5 is connected to the first end of capacitor C17, the GND port of voltage regulator chip U5 is grounded, the VOUT port of voltage regulator chip U5 is connected to the first end of capacitor C18, the second end of capacitor C18 is grounded, the first end of capacitor C19 is connected to the first end of capacitor C18, the second end of capacitor C19 is grounded.

[0029] Preferably, the third step-down unit comprises a capacitor C20, a capacitor C21 and a voltage stabilizing chip U6, and the model of the voltage stabilizing chip U6 is AMS1117;

[0030] The first end of capacitor C20 is connected to the first end of capacitor C19, the second end of capacitor C20 is grounded, the VIN port of voltage regulator chip U6 is connected to the first end of capacitor C20, the GND port of voltage regulator chip U6 is grounded, the VOUT port of voltage regulator chip U6 is connected to the first end of capacitor C21, and the second end of capacitor C21 is grounded.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention monitors the motor working current in real time by setting up a stirring detection module and an ice-making detection module. The main control module accurately adjusts the power of the stirring motor and the compressor motor according to the feedback signal. Users can conveniently set different working gears through the touch screen module, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the invention;

[0034] Figure 2 It is a structural schematic diagram of the power module in the invention;

[0035] Figure 3 It is a circuit diagram of the main control module in the invention;

[0036] Figure 4 is a circuit diagram of the stirring module in the invention;

[0037] Figure 5 The circuit diagram of the ice-making module in the invention;

[0038] Figure 6 is a circuit diagram of the stirring detection module in the invention;

[0039] Figure 7 The circuit diagram of the ice making detection module in the invention;

[0040] Figure 8 The circuit diagram of the touch screen module in the invention;

[0041] Fig. 9is a circuit diagram of the rectifier unit in the invention;

[0042] Fig.10 is a circuit diagram of the first step-down unit in the invention;

[0043] Fig.11 is a circuit diagram of the second step-down unit in the invention;

[0044] Fig.12 is a circuit diagram of the third step-down unit in the invention;

[0045] In the figure:

[0046] 1. Main control module;

[0047] 2. Mixing module;

[0048] 3. Ice making module;

[0049] 4. Stirring detection module;

[0050] 5. Ice making detection module;

[0051] 6. Touch screen module;

[0052] 7. Power module; 70. Rectification unit; 71. First step-down unit; 72. Second step-down unit; 73. Third step-down unit. DETAILED DESCRIPTION

[0053] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] See also Figure 1-Figure 12 , the present invention provides a technical solution:

[0055] A multi-speed smoothie machine based on motor current control function includes a main control module 1, a stirring module 2, an ice-making module 3, a stirring detection module 4, an ice-making detection module 5, a touch screen module 6 and a power module 7. The stirring module 2 and the ice-making module 3 are electrically connected to the main control module 1, the stirring detection module 4, the ice-making detection module 5 and the touch screen module 6 are signal-connected to the main control module 1, the power module 7 is used to provide power, the main control module 1 controls the stirring module 2 and the ice-making module 3 to make smoothies, and the stirring detection module 4 and the ice-making detection module 5 assist the main control module 1 in precise control.

[0056] In this embodiment, the main control module 1 includes a main control chip U1, a +5V power supply, a resistor R1 and a capacitor C1;

[0057] The GND port of the main control chip U1 is grounded, the first end of the capacitor C1 is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the +5V power supply, and the VCC port of the main control chip U1 is connected to the second end of the capacitor C1. The main control module 1 can be a common single-chip microcomputer and is equipped with a corresponding reset circuit and clock circuit.

[0058] Specifically, the stirring module 2 includes a +10V power supply, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, a transistor Q1 and a stirring motor M1, where the transistor Q1 is an NPN transistor;

[0059] The first end of resistor R2 is connected to the P06 port of the main control chip U1, the second end of resistor R2 is connected to the base of transistor Q1, the first end of resistor R3 is connected to the base of transistor Q1, the second end of resistor R3 is grounded, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the second end of resistor R4, the first end of resistor R4 is connected to the +10V power supply, the first end of resistor R5 is connected to the second end of resistor R4, the second end of resistor R5 is connected to the first end of resistor R6, the second end of resistor R6 is connected to the speed control port of stirring motor M1, the main control chip U1 outputs a PWM signal to control the speed of main control chip U1, the first end of resistor R7 is connected to the P10 port of main control chip U1, the second end of resistor R7 is connected to the frequency detection port of stirring motor M1, and the frequency can be measured by Hall sensor.

[0060] Specifically, the ice-making module 3 includes a resistor R8, an optical coupler MOC3021, a resistor R9, a thyristor Q2, a compressor motor M2, an AC live wire ACL and an AC neutral wire ACN, and the model of the thyristor Q2 is BT136;

[0061] The first end of resistor R8 is connected to the P11 port of the main control chip U1, resistor R8 is connected to the anode of the optocoupler MOC3021, the cathode of the optocoupler MOC3021 is grounded, the first end of the thyristor Q2 is connected to the AC live wire ACL, the second end of the thyristor Q2 is connected to the live wire port of the compressor motor M2, the control end of the thyristor Q2 is connected to the first end of resistor R9, the second end of resistor R9 is connected to the second main port of the optocoupler MOC3021, the first main port of the optocoupler MOC3021 is connected to the second end of the thyristor Q2, the neutral line port of the compressor motor M2 is connected to the AC neutral line ACN, the optocoupler MOC3021 is used for isolation, and the main control chip U1 outputs high and low levels to control the switch of the thyristor Q2, thereby controlling the compressor motor M2.

[0062] Specifically, the stirring detection module 4 includes a +3.3V power supply, a resistor R10, a resistor R11, a resistor R12, a transistor Q3, a transistor Q4, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a transistor Q5, a transistor Q6 and a stirring detection unit PM50S, where the transistors Q3, Q4, Q5 and Q6 are all NPN transistors;

[0063] The switch port of the stirring detection unit PM50S is connected to the P46 port of the main control chip U1. The stirring detection unit PM50S is used to detect the working current of the stirring motor M1. The working current can be measured through a current transformer, and other operating parameters such as the working voltage and working temperature can also be measured;

[0064] The TX port of the stirring detection unit PM50S is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the second end of the resistor R10, the first end of the resistor R10 is connected to the +5V power supply, the first end of the resistor R11 is connected to the +5V power supply, the second end of the resistor R11 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the second end of the resistor R10, the emitter of the transistor Q4 is grounded, the first end of the resistor R12 is connected to the second end of the resistor R11, and the second end of the resistor R12 is connected to the P31 port of the main control chip U1;

[0065] The RX port of the stirring detection unit PM50S is connected to the first end of resistor R13, the second end of resistor R13 is connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, the first end of resistor R14 is connected to the +3.3V power supply, the second end of resistor R14 is connected to the collector of transistor Q5, the emitter of transistor Q5 is grounded, the base of transistor Q5 is connected to the second end of resistor R16, the first end of resistor R16 is connected to the P32 port of the main control chip U1, the first end of resistor R15 is connected to the +3.3V power supply, the second end of resistor R15 is connected to the collector of transistor Q6, and the base of transistor Q6 is connected to the second end of resistor R14.

[0066] Specifically, the ice-making detection module 5 includes a resistor R17, a resistor R18, a resistor R19, a transistor Q7, a transistor Q8, a resistor R44, a resistor R20, a resistor R21, a transistor Q9, a transistor Q10 and an ice-making detection unit CPJK. The ice-making detection unit CPJK is used to detect the working current of the compressor motor M2. The transistors Q7, Q81, Q9 and Q10 are all NPN transistors. The working current can be measured by a current transformer, and other operating parameters such as the working voltage and the working temperature can also be measured.

[0067] The T port of the ice-making detection unit CPJK 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 the second end of the resistor R17, the first end of the resistor R17 is connected to the +5V power supply, the first end of the resistor R18 is connected to the +5V power supply, the second end of the resistor R18 is connected to the collector of the transistor Q8, the base of the transistor Q8 is connected to the second end of the resistor R17, the emitter of the transistor Q8 is grounded, the first end of the resistor R19 is connected to the second end of the resistor R18, and the second end of the resistor R19 is connected to the P26 port of the main control chip U1;

[0068] The R port of the ice making detection unit CPJK is connected to the collector of the transistor Q10, the emitter of the transistor Q10 is grounded, the first end of the resistor R44 is connected to the +3.3V power supply, the second end of the resistor R44 is connected to the base of the transistor Q10, the first end of the resistor R20 is connected to the +3.3V power supply, the second end of the resistor R20 is connected to the collector of the transistor Q10, the first end of the resistor R21 is connected to the P27 port of the main control chip U1, the second end of the resistor R21 is connected to the base of the transistor Q9, the collector of the transistor Q9 is connected to the second end of the resistor R44, and the transistor Q9 is grounded.

[0069] Further, the touch screen module 6 includes a resistor R22, a resistor R23, a transceiver chip U2, a capacitor C3, a capacitor C4, a resistor R24, a resistor R25, a diode D1, a resistor R26, a resistor R27, a diode D2 and a socket CN2. The diode D1 and the diode D2 are both voltage-stabilizing diodes. The socket CN2 is connected to a touch screen. The transceiver chip U2 is of model SP3485, which can transmit the operating parameters and status information of the smoothie machine to the touch screen for display. At the same time, it can also receive the instructions input by the user through the touch screen and transmit them to the main control chip U1 for execution;

[0070] The first end of resistor R22 is connected to the P33 port of the main control chip U1, the second end of resistor R22 receives the RO port of the transceiver chip U2, the first end of resistor R23 is connected to the P34 port of the main control chip U1, the second end of resistor R23 receives the DI port of the transceiver chip U2, the RE port and the DE port of the transceiver chip U2 are connected to the +5V power supply, the first end of capacitor C3 is grounded, the second end of capacitor C3 is connected to the +5V power supply, the first end of capacitor C4 is grounded, the second end of capacitor C4 is connected to the +5V power supply, the VCC port of the transceiver chip U2 is connected to the +5V power supply, and the GND of the transceiver chip U2 The port is grounded, the B port of the transceiver chip U2 is connected to the first end of the resistor R25, the A port of the transceiver chip U2 is connected to the first end of the resistor R27, the second end of the resistor R25 and the second end of the resistor R27 are connected to different ports of the socket CN2, the first end of the resistor R24 ​​is grounded, the second end of the resistor R24 ​​is connected to the first end of the resistor R25, the first end of the diode D1 is grounded, the second end of the diode D1 is connected to the first end of the resistor R25, the first end of the resistor R26 is connected to the first end of the resistor R27, the second end of the resistor R26 is grounded, the first end of the diode D2 is connected to the first end of the resistor R27, and the second end of the diode D2 is grounded.

[0071] Furthermore, the power module 7 includes a rectifier unit 70, a first step-down unit 71, a second step-down unit 72 and a third step-down unit 73 which are electrically connected in sequence. The power module 7 is used to provide power supplies of different voltages. The first step-down unit 71, the second step-down unit 72 and the third step-down unit 73 output +10V power supply, +5V power supply and +3.3V power supply respectively to meet the needs of different devices.

[0072] In addition, the rectifier unit 70 includes a fuse F, a varistor ZR, a capacitor C5, a resistor R27, a resistor R28, a rectifier bridge, a capacitor C6, a filter LF and a capacitor C7;

[0073] A first end of the fuse F is connected to the AC live wire ACL to prevent overcurrent, a first end of the varistor ZR is connected to the second end of the fuse F, a second end of the varistor ZR is connected to the AC neutral line ACN to suppress overvoltage, a first end of the capacitor C5 is connected to the first end of the varistor ZR, a second end of the capacitor C5 is connected to the second end of the varistor ZR, a first end of the resistor R27 is connected to the first end of the capacitor C5, a second end of the resistor R27 is connected to the first end of the resistor R28, a second end of the resistor R28 is connected to the second end of the capacitor C5, two input ends of the rectifier bridge are respectively connected to the two ends of the capacitor C5, two output ends of the rectifier bridge are respectively connected to the two ends of the capacitor C6, the rectifier bridge is a full-bridge rectifier circuit, which converts AC power into DC power, a first end of the filter LF is connected to the first end of the capacitor C6, a third end of the filter LF is connected to the second end of the capacitor C6, a second end of the filter LF is connected to the first end of the capacitor C7, a fourth end of the filter LF is connected to the second end of the capacitor C7 to filter out high-frequency noise and interference signals, and the second end of the capacitor C7 is grounded.

[0074] It is worth noting that the first step-down unit 71 includes a resistor R29, a resistor R30, a capacitor C8, a capacitor C9, a resistor R31, a resistor R32, a resistor R33, a diode D3, a resistor R34, a diode D4, a control chip U3, a resistor R35, a resistor R36, a capacitor C12, an optical coupler 817, a resistor R39, a resistor R40, a first primary coil, a second primary coil, a secondary coil, a diode D5, a capacitor C10, a resistor R37, a capacitor C11, a resistor R38, a resistor R43, a capacitor C13, a resistor R41, a voltage regulator TL431 and a resistor R42, and the model of the control chip U3 is CR5269S;

[0075] The first terminal of the resistor R29 is connected to the first end of the capacitor C7, the second terminal of the resistor R29 is connected to the first end of the resistor R30, the second terminal of the resistor R30 is connected to the first end of the capacitor C8, the second end of the capacitor C8 is grounded, the first terminal of the capacitor C9 is connected to the first end of the resistor R29, the first terminal of the resistor R31 is connected to the first end of the capacitor C9, the second terminal of the resistor R31 is connected to the second end of the capacitor C9, the first terminal of the resistor R32 is connected to the first end of the resistor R31, the second terminal of the resistor R32 is connected to the second end of the resistor R31, the first terminal of the resistor R33 is connected to the second end of the resistor R32, the first terminal of the first primary coil is connected to the first end of the capacitor C7, the second terminal of the first primary coil is connected to the positive electrode of the diode D3, the negative electrode of the diode D3 is connected to the second end of the resistor R33, the first terminal of the second primary coil is connected to the positive electrode of the diode D4, and the second end of the second primary coil is grounded. The cathode of diode D4 is connected to the second end of resistor R34, the first end of resistor R34 is connected to the second end of resistor R30, the VDD port of control chip U3 is connected to the first end of resistor R34, the GND port of control chip U3 is grounded, the SENSE port of control chip U3 is connected to the first end of resistor R35, the second end of resistor R35 is grounded, the first end of resistor R36 is connected to the first end of resistor R35, the second end of resistor R36 is grounded, the DRAIN port of control chip U3 is connected to the anode of diode D3, the first end of secondary coil is connected to the anode of diode D5, the second end of secondary coil is grounded, the cathode of diode D5 is connected to the first end of capacitor C11, the second end of capacitor C11 is grounded, the first end of resistor R38 is connected to the first end of capacitor C11, the second end of resistor R38 is grounded, the first end of resistor R37 is connected to the first end of The first terminal of the resistor R37 is connected to the positive electrode of the diode D5, the second terminal of the resistor R37 is connected to the first terminal of the capacitor C10, the second terminal of the capacitor C10 is connected to the negative electrode of the diode D5, the FB port of the control chip U3 is connected to the collector of the optocoupler 817, the emitter of the optocoupler 817 is grounded, the first terminal of the capacitor C12 is connected to the collector of the optocoupler 817, the second terminal of the capacitor C12 is grounded, the first terminal of the resistor R39 is connected to the negative electrode of the diode D5, the second terminal of the resistor R39 is connected to the anode of the optocoupler 817, the first terminal of the resistor R40 is connected to the first terminal of the resistor R39, the second terminal of the resistor R40 is connected to the cathode of the optocoupler 817, the first terminal of the capacitor C13 is connected to the second terminal of the resistor R40, the second terminal of the capacitor C13 is connected to the first terminal of the resistor R41, the second terminal of the resistor R41 is connected to the second terminal of the resistor R43, the first terminal of the resistor R43 is connected to the negative electrode of the diode D5, and the stabilizer is connected to the positive electrode of the diode D5. The anode of the voltage source TL431 is grounded, the cathode of the voltage regulator TL431 is connected to the second end of the resistor R40, the reference electrode of the voltage regulator TL431 is connected to the second end of the resistor R43, the first end of the resistor R42 is grounded, and the second end of the resistor R42 is connected to the second end of the resistor R43. The DC voltage output by the rectifier unit 70 enters the first step-down unit 71. The circuit composed of resistors R29, R30, capacitors C8, and C9 participates in the power supply and related control of the primary coil. The control chip U3 adjusts the output according to the feedback signal to ensure stable voltage output. The secondary coil is rectified by the diode D5 and filtered by the capacitor C11 to provide a stable DC voltage for the subsequent circuit. The optical coupler 817, the voltage regulator TL431 and other components form a feedback circuit to feed back the output voltage to the control chip U3.It enables the output to be adjusted in real time to ensure voltage stability.

[0076] It is worth noting that the second step-down unit 72 includes capacitors C16, C17, C18, C19 and a voltage regulator chip U5, whose model is LM78M05;

[0077] The first end of capacitor C16 is connected to the cathode of diode D5, the second end of capacitor C16 is grounded, the first end of capacitor C17 is connected to the first end of capacitor C16, the second end of capacitor C17 is grounded, the VIN port of voltage regulator chip U5 is connected to the first end of capacitor C17, the GND port of voltage regulator chip U5 is grounded, the VOUT port of voltage regulator chip U5 is connected to the first end of capacitor C18, the second end of capacitor C18 is grounded, the first end of capacitor C19 is connected to the first end of capacitor C18, the second end of capacitor C19 is grounded, and the +10V power supply is converted into a +5V power supply.

[0078] Finally, the third step-down unit 73 includes a capacitor C20, a capacitor C21 and a voltage stabilizing chip U6, and the model of the voltage stabilizing chip U6 is AMS1117;

[0079] The first end of capacitor C20 is connected to the first end of capacitor C19, the second end of capacitor C20 is grounded, the VIN port of voltage regulator chip U6 is connected to the first end of capacitor C20, the GND port of voltage regulator chip U6 is grounded, the VOUT port of voltage regulator chip U6 is connected to the first end of capacitor C21, the second end of capacitor C21 is grounded, and the +5V power supply is converted into a +3.3V power supply.

[0080] When the multi-speed smoothie machine based on the motor current control function of the present invention is in use, the power module 7 converts the AC mains power into the DC voltage required by each module of the smoothie machine, the rectifier unit 70 first performs rectification and preliminary filtering, the first step-down unit 71 further steps down and stabilizes the voltage, the second step-down unit 72 and the third step-down unit 73 respectively provide +5V power and +3.3V power to power different chips and circuits;

[0081] The main control chip U1 outputs a PWM signal to control the stirring motor M1, and detects the frequency and working current of the stirring motor M1. The main control chip U1 controls the compressor motor M2 through the optocoupler MOC3021 and the thyristor Q2, and detects the working current of the compressor motor M2 at the same time;

[0082] The user operates and sets the smoothie machine through the touch screen module. The touch screen operation signal is transmitted to the main control chip U1 through the transceiver chip U2. The main control chip U1 processes the signal and controls the operation of the corresponding module. At the same time, the main control chip transmits the equipment working status and parameter information to the touch screen display to realize human-computer interaction.

[0083] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-speed smoothie machine based on motor current control function, characterized by: The invention comprises a main control module (1), a stirring module (2), an ice-making module (3), a stirring detection module (4), an ice-making detection module (5), a touch screen module (6) and a power module (7); the stirring module (2) and the ice-making module (3) are both electrically connected to the main control module (1); the stirring detection module (4), the ice-making detection module (5) and the touch screen module (6) are both signal-connected to the main control module (1); and the power module (7) is used for providing power.

2. The multi-speed smoothie machine based on the motor current control function according to claim 1 is characterized in that: The main control module (1) comprises a main control chip U1, a +5V power supply, a resistor R1 and a capacitor C1; The GND port of the main control chip U1 is grounded, the first end of the capacitor C1 is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the +5V power supply, and the VCC port of the main control chip U1 is connected to the second end of the capacitor C1.

3. The multi-speed smoothie machine based on motor current control function according to claim 1, characterized in that: The stirring module (2) comprises a +10V power supply, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, a transistor Q1 and a stirring motor M1; The first end of resistor R2 is connected to the P06 port of the main control chip U1, the second end of resistor R2 is connected to the base of transistor Q1, the first end of resistor R3 is connected to the base of transistor Q1, the second end of resistor R3 is grounded, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the second end of resistor R4, the first end of resistor R4 is connected to the +10V power supply, the first end of resistor R5 is connected to the second end of resistor R4, the second end of resistor R5 is connected to the first end of resistor R6, the second end of resistor R6 is connected to the speed control port of stirring motor M1, the first end of resistor R7 is connected to the P10 port of the main control chip U1, and the second end of resistor R7 is connected to the frequency detection port of stirring motor M1.

4. The multi-speed smoothie machine based on motor current control function according to claim 1, characterized in that: The ice-making module (3) comprises a resistor R8, an optical coupler MOC3021, a resistor R9, a thyristor Q2, a compressor motor M2, an AC live wire ACL and an AC neutral wire ACN, and the model of the thyristor Q2 is BT136; The first end of resistor R8 is connected to the P11 port of the main control chip U1, the resistor R8 is connected to the anode of the optocoupler MOC3021, the cathode of the optocoupler MOC3021 is grounded, the first end of the thyristor Q2 is connected to the AC live wire ACL, the second end of the thyristor Q2 is connected to the live wire port of the compressor motor M2, the control end of the thyristor Q2 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the second main port of the optocoupler MOC3021, the first main port of the optocoupler MOC3021 is connected to the second end of the thyristor Q2, and the neutral line port of the compressor motor M2 is connected to the AC neutral line ACN.

5. The multi-speed smoothie machine based on motor current control function according to claim 1, characterized in that: The stirring detection module (4) comprises a +3.3V power supply, a resistor R10, a resistor R11, a resistor R12, a transistor Q3, a transistor Q4, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a transistor Q5, a transistor Q6 and a stirring detection unit PM50S; The switch port of the stirring detection unit PM50S is connected to the P46 port of the main control chip U1. The stirring detection unit PM50S is used to detect the working current of the stirring motor M1; The TX port of the stirring detection unit PM50S is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the second end of the resistor R10, the first end of the resistor R10 is connected to the +5V power supply, the first end of the resistor R11 is connected to the +5V power supply, the second end of the resistor R11 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the second end of the resistor R10, the emitter of the transistor Q4 is grounded, the first end of the resistor R12 is connected to the second end of the resistor R11, and the second end of the resistor R12 is connected to the P31 port of the main control chip U1; The RX port of the stirring detection unit PM50S is connected to the first end of resistor R13, the second end of resistor R13 is connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, the first end of resistor R14 is connected to the +3.3V power supply, the second end of resistor R14 is connected to the collector of transistor Q5, the emitter of transistor Q5 is grounded, the base of transistor Q5 is connected to the second end of resistor R16, the first end of resistor R16 is connected to the P32 port of the main control chip U1, the first end of resistor R15 is connected to the +3.3V power supply, the second end of resistor R15 is connected to the collector of transistor Q6, and the base of transistor Q6 is connected to the second end of resistor R14.

6. The multi-speed smoothie machine based on motor current control function according to claim 1, characterized in that: The ice making detection module (5) comprises a resistor R17, a resistor R18, a resistor R19, a transistor Q7, a transistor Q8, a resistor R44, a resistor R20, a resistor R21, a transistor Q9, a transistor Q10 and an ice making detection unit CPJK, and the ice making detection unit CPJK is used to detect the working current of the compressor motor M2; The T port of the ice-making detection unit CPJK 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 the second end of the resistor R17, the first end of the resistor R17 is connected to the +5V power supply, the first end of the resistor R18 is connected to the +5V power supply, the second end of the resistor R18 is connected to the collector of the transistor Q8, the base of the transistor Q8 is connected to the second end of the resistor R17, the emitter of the transistor Q8 is grounded, the first end of the resistor R19 is connected to the second end of the resistor R18, and the second end of the resistor R19 is connected to the P26 port of the main control chip U1; The R port of the ice making detection unit CPJK is connected to the collector of the transistor Q10, the emitter of the transistor Q10 is grounded, the first end of the resistor R44 is connected to the +3.3V power supply, the second end of the resistor R44 is connected to the base of the transistor Q10, the first end of the resistor R20 is connected to the +3.3V power supply, the second end of the resistor R20 is connected to the collector of the transistor Q10, the first end of the resistor R21 is connected to the P27 port of the main control chip U1, the second end of the resistor R21 is connected to the base of the transistor Q9, the collector of the transistor Q9 is connected to the second end of the resistor R44, and the transistor Q9 is grounded.

7. The multi-speed smoothie machine based on motor current control function according to claim 1, characterized in that: The touch screen module (6) comprises a resistor R22, a resistor R23, a transceiver chip U2, a capacitor C3, a capacitor C4, a resistor R24, a resistor R25, a diode D1, a resistor R26, a resistor R27, a diode D2 and a socket CN2, wherein the diode D1 and the diode D2 are both voltage-stabilizing diodes, the socket CN2 is connected to a touch screen, and the model of the transceiver chip U2 is SP3485; The first end of resistor R22 is connected to the P33 port of the main control chip U1, the second end of resistor R22 receives the RO port of the transceiver chip U2, the first end of resistor R23 is connected to the P34 port of the main control chip U1, the second end of resistor R23 receives the DI port of the transceiver chip U2, the RE port and the DE port of the transceiver chip U2 are connected to the +5V power supply, the first end of capacitor C3 is grounded, the second end of capacitor C3 is connected to the +5V power supply, the first end of capacitor C4 is grounded, the second end of capacitor C4 is connected to the +5V power supply, the VCC port of the transceiver chip U2 is connected to the +5V power supply, and the GND of the transceiver chip U2 The port is grounded, the B port of the transceiver chip U2 is connected to the first end of the resistor R25, the A port of the transceiver chip U2 is connected to the first end of the resistor R27, the second end of the resistor R25 and the second end of the resistor R27 are connected to different ports of the socket CN2, the first end of the resistor R24 ​​is grounded, the second end of the resistor R24 ​​is connected to the first end of the resistor R25, the first end of the diode D1 is grounded, the second end of the diode D1 is connected to the first end of the resistor R25, the first end of the resistor R26 is connected to the first end of the resistor R27, the second end of the resistor R26 is grounded, the first end of the diode D2 is connected to the first end of the resistor R27, and the second end of the diode D2 is grounded.

8. The multi-speed smoothie machine based on motor current control function according to claim 1, characterized in that: The power module (7) comprises a rectifier unit (70), a first voltage reduction unit (71), a second voltage reduction unit (72) and a third voltage reduction unit (73) which are electrically connected in sequence, and the power module (7) is used to provide power supplies with different voltages; The rectifier unit (70) comprises a fuse F, a varistor ZR, a capacitor C5, a resistor R27, a resistor R28, a rectifier bridge, a capacitor C6, a filter LF and a capacitor C7; A first end of the fuse F is connected to the AC live wire ACL, a first end of the varistor ZR is connected to the second end of the fuse F, a second end of the varistor ZR is connected to the AC neutral line ACN, a first end of the capacitor C5 is connected to the first end of the varistor ZR, a second end of the capacitor C5 is connected to the second end of the varistor ZR, a first end of the resistor R27 is connected to the first end of the capacitor C5, a second end of the resistor R27 is connected to the first end of the resistor R28, a second end of the resistor R28 is connected to the second end of the capacitor C5, two input ends of the rectifier bridge are respectively connected to the two ends of the capacitor C5, two output ends of the rectifier bridge are respectively connected to the two ends of the capacitor C6, a first end of the filter LF is connected to the first end of the capacitor C6, a third end of the filter LF is connected to the second end of the capacitor C6, a second end of the filter LF is connected to the first end of the capacitor C7, a fourth end of the filter LF is connected to the second end of the capacitor C7, and the second end of the capacitor C7 is grounded.

9. The multi-speed smoothie machine based on motor current control function according to claim 8, characterized in that: The first step-down unit (71) comprises a resistor R29, a resistor R30, a capacitor C8, a capacitor C9, a resistor R31, a resistor R32, a resistor R33, a diode D3, a resistor R34, a diode D4, a control chip U3, a resistor R35, a resistor R36, a capacitor C12, an optical coupler 817, a resistor R39, a resistor R40, a first primary coil, a second primary coil, a secondary coil, a diode D5, a capacitor C10, a resistor R37, a capacitor C11, a resistor R38, a resistor R43, a capacitor C13, a resistor R41, a voltage regulator TL431 and a resistor R42, and the model of the control chip U3 is CR5269S; The first terminal of resistor R29 is connected to the first end of capacitor C7, the second terminal of resistor R29 is connected to the first end of resistor R30, the second terminal of resistor R30 is connected to the first end of capacitor C8, the second end of capacitor C8 is grounded, the first terminal of capacitor C9 is connected to the first end of resistor R29, the first terminal of resistor R31 is connected to the first end of capacitor C9, the second terminal of resistor R31 is connected to the second end of capacitor C9, the first terminal of resistor R32 is connected to the first end of resistor R31, the second terminal of resistor R32 is connected to the second end of resistor R31, the first terminal of resistor R33 is connected to the second end of resistor R32, the first terminal of the first primary coil is connected to the first end of capacitor C7, the second terminal of the first primary coil is connected to the positive electrode of diode D3, and diode D3 The negative electrode is connected to the second end of the resistor R33, the first end of the second primary coil is connected to the positive electrode of the diode D4, the second end of the second primary coil is grounded, the negative electrode of the diode D4 is connected to the second end of the resistor R34, the first end of the resistor R34 is connected to the second end of the resistor R30, the VDD port of the control chip U3 is connected to the first end of the resistor R34, the GND port of the control chip U3 is grounded, the SENSE port of the control chip U3 is connected to the first end of the resistor R35, the second end of the resistor R35 is grounded, the first end of the resistor R36 is connected to the first end of the resistor R35, the second end of the resistor R36 is grounded, the DRAIN port of the control chip U3 is connected to the positive electrode of the diode D3, the first end of the secondary coil The positive electrode of the diode D5 is connected, the second end of the secondary coil is grounded, the negative electrode of the diode D5 is connected to the first end of the capacitor C11, the second end of the capacitor C11 is grounded, the first end of the resistor R38 is connected to the first end of the capacitor C11, the second end of the resistor R38 is grounded, the first end of the resistor R37 is connected to the positive electrode of the diode D5, the second end of the resistor R37 is connected to the first end of the capacitor C10, the second end of the capacitor C10 is connected to the negative electrode of the diode D5, the FB port of the control chip U3 is connected to the collector of the optocoupler 817, the emitter of the optocoupler 817 is grounded, the first end of the capacitor C12 is connected to the collector of the optocoupler 817, the second end of the capacitor C12 is grounded, the first end of the resistor R39 is connected to the negative electrode of the diode D5, The second end of resistor R39 is connected to the anode of optocoupler 817, the first end of resistor R40 is connected to the first end of resistor R39, the second end of resistor R40 is connected to the cathode of optocoupler 817, the first end of capacitor C13 is connected to the second end of resistor R40, the second end of capacitor C13 is connected to the first end of resistor R41, the second end of resistor R41 is connected to the second end of resistor R43, the first end of resistor R43 is connected to the cathode of diode D5, the anode of voltage regulator source TL431 is grounded, the cathode of voltage regulator source TL431 is connected to the second end of resistor R40, the reference pole of voltage regulator source TL431 is connected to the second end of resistor R43, the first end of resistor R42 is grounded, and the second end of resistor R42 is connected to the second end of resistor R43.

10. The multi-speed smoothie machine based on motor current control function according to claim 9, characterized in that: The second voltage reduction unit (72) comprises a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19 and a voltage stabilizing chip U5, the model of which is LM78M05; The first terminal of capacitor C16 is connected to the cathode of diode D5, the second terminal of capacitor C16 is grounded, the first terminal of capacitor C17 is connected to the first terminal of capacitor C16, the second terminal of capacitor C17 is grounded, the VIN port of voltage regulator chip U5 is connected to the first terminal of capacitor C17, the GND port of voltage regulator chip U5 is grounded, the VOUT port of voltage regulator chip U5 is connected to the first terminal of capacitor C18, the second terminal of capacitor C18 is grounded, the first terminal of capacitor C19 is connected to the first terminal of capacitor C18, the second terminal of capacitor C19 is grounded; The third step-down unit (73) comprises a capacitor C20, a capacitor C21 and a voltage stabilizing chip U6, and the model of the voltage stabilizing chip U6 is AMS1117; The first end of capacitor C20 is connected to the first end of capacitor C19, the second end of capacitor C20 is grounded, the VIN port of voltage regulator chip U6 is connected to the first end of capacitor C20, the GND port of voltage regulator chip U6 is grounded, the VOUT port of voltage regulator chip U6 is connected to the first end of capacitor C21, and the second end of capacitor C21 is grounded.

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