A chef machine control circuit with weighing function

Abstract

The utility model discloses a kind of chef machine control circuit with weighing function, it includes electronic scale control circuit, main control circuit and display control circuit, electronic scale control circuit includes electronic scale control chip U1;Main control circuit includes switching power supply module, motor control module and MCU, switching power supply module is connected with MCU, electronic scale control chip U1, motor control module and display control circuit respectively, MCU is connected with electronic scale control chip U1, motor control module and display control circuit respectively.Electronic scale control chip U1 is connected with external weighing sensor, it is used to read the weighing data of weighing sensor, and after reading, the weighing data is sent to MCU, it is convenient for MCU to parse data, after MCU completes to parse data, generates control signal, and control signal is sent to display control circuit.Display control circuit receives control signal, and according to control signal display weight data, to realize the weighing function of chef machine.

Description

Technical Field

[0001] This utility model relates to the field of chef machine control technology, specifically to a chef machine control circuit with weighing function. Background Technology

[0002] A typical stand mixer mainly consists of a body, a mixing head, and a mixing bowl. The mixing head has a shaft that houses a mixer that extends into the mixing bowl, where it mixes ingredients. Stand mixers are widely used in both Chinese and Western pastry making, offering functions such as kneading dough, beating eggs, and mixing. They are increasingly popular due to their time-saving, labor-saving, and convenient processing capabilities.

[0003] Currently, most food processors on the market only have functions such as mixing and fermentation. In actual use, users need to prepare an electronic scale to weigh the food, which results in high operating costs and takes up space. Utility Model Content

[0004] To address the shortcomings of existing technologies, a control circuit for a food processor with weighing function is provided.

[0005] To achieve the above objectives, this utility model provides a control circuit for a food processor with weighing function, including an electronic scale control circuit, a main control circuit, and a display control circuit. The electronic scale control circuit includes an electronic scale control chip U1; the main control circuit includes a switching power supply module, a motor control module, and an MCU. The switching power supply module is connected to the MCU, the electronic scale control chip U1, the motor control module, and the display control circuit, respectively. The MCU is connected to the electronic scale control chip U1 and the motor control module, respectively.

[0006] According to one embodiment of the present invention, the switching power supply module includes an EMI filter unit, a half-wave rectifier unit, an LC filter unit, a voltage regulator chip, and an output filter unit. The input terminal of the EMI filter unit is connected to the AC mains power supply, and the output terminal of the EMI filter unit is connected to the motor control module and the input terminal of the half-wave rectifier unit. The output terminal of the EMI filter unit has an AC_L terminal and an AC_N terminal, which are connected to the motor control module. The output terminal of the half-wave rectifier unit is connected to the input terminal of the LC filter unit. The voltage regulator chip is connected to the output terminal of the LC filter unit, and the output filter unit is connected to the output terminal of the voltage regulator chip. The output terminal of the output filter unit is connected to the MCU, the electronic scale control chip U1, and the display control circuit, respectively. The output terminal of the output filter unit outputs a first supply voltage.

[0007] According to one embodiment of the present invention, the switching power supply module further includes a step-down unit, which includes a capacitor C4, a resistor R9, a Zener diode Q4, a capacitor C5, and a capacitor EC3. One end of the capacitor C4 is connected to the output terminal of the output filter unit, and the other end is grounded. One end of the resistor R9 is connected to the output terminal of the output filter unit and the capacitor C4, and the other end is connected to the collector of the Zener diode Q4. The base of the Zener diode Q4 is grounded, and the emitter of the Zener diode Q4 is connected to one end of the capacitor C5 and the capacitor EC3. The emitter of the Zener diode Q4 outputs a second supply voltage, and the other ends of the capacitors C5 and EC3 are grounded. The second supply voltage is connected to the electronic scale control chip U1.

[0008] According to one embodiment of this utility model, the main control circuit further includes a Hall filter module. The Hall filter module includes an interface HR1, a Hall filter unit, and a Hall voltage divider unit. The interface HR1 has a first terminal, a second terminal, and a third terminal. The Hall filter unit includes capacitors C15 and C12. The Hall voltage divider unit includes resistors R37, R35, RJ11, and RJ3. Resistors R35, RJ11, and RJ3 are connected in series between the first terminal of the interface HR1 and the MCU. One end of capacitor C15 is connected to the first terminal of the interface HR1 and resistor R35, and the other end is grounded. One end of resistor R37 is connected to the first terminal of the interface HR1 and resistor R35, and the other end is connected to the switching power supply module. One end of capacitor C12 is connected to resistor R35 and resistor RJ11, and the other end is grounded. The second terminal of the interface HR1 is grounded. The third terminal of the interface HR1 is connected to the switching power supply module after passing through resistor R38.

[0009] According to one embodiment of this utility model, the main control circuit further includes a buzzer module, which includes resistors RJ2, R36, and R41, transistor Q3, R34, and R33, and a buzzer Buz1. One end of resistor RJ2 is connected to the MCU, and the other end is connected in series with resistor R36. The other end of resistor R36 is connected to the base of transistor Q3, and the emitter of transistor Q3 is grounded. Resistor R41 is connected between the base and emitter of transistor Q3. One end of resistor R34 is connected to the collector of transistor Q3, and the other end is connected to resistor R33. The other end of resistor R33 is connected to the output terminal of the switching power supply module. The A and B pins of buzzer Buz1 are respectively connected to the two ends of resistor R33.

[0010] According to one embodiment of this utility model, the electronic scale control circuit further includes an anti-interference module, interface J1, interface J2, and interface J3. The anti-interference module includes a current-limiting resistor R6, a current-limiting resistor R7, a filter capacitor C16, a filter capacitor C17, and a filter capacitor C18. One end of resistor R6 is connected to the seventh pin of the electronic scale control chip U1, and the other end is connected to interface J1, interface J2, and interface J3 respectively. One end of capacitor C16 is connected to the seventh pin of the electronic scale control chip U1, and the other end is grounded. One end of resistor R7 is connected to the eighth pin of the electronic scale control chip U1, and the other end is connected to interface J1, interface J2, and interface J3 respectively. One end of capacitor C18 is connected to the eighth pin of the electronic scale control chip U1, and the other end is grounded. The two ends of capacitor C17 are connected to the seventh pin and the eighth pin of the electronic scale control chip U1 respectively.

[0011] According to one embodiment of the present invention, the display control circuit includes a display control chip U2 and an LED module; the display control chip U2 is connected to the MCU and the switching power supply module; the LED module includes four LED display units, each LED display unit being connected to the display control chip U2.

[0012] According to one embodiment of the present invention, the switching power supply module further includes a zero-crossing unit, which includes a resistor R10, a resistor R11, a diode D5, a diode D4, and a capacitor C6. One end of the resistor R10 is connected to the output terminal of the EMI filter unit, and the other end is connected in series with the resistor R11. The other end of the resistor R11 is connected to the MCU. The cathode of the diode D5 is connected to the resistor R11 and the MCU, and the anode of the diode D5 is grounded. The anode of the diode D4 is connected to the diode R11 and the MCU, and the other end is connected to the output terminal of the output filter unit. One end of the capacitor C6 is connected to the MCU, and the other end is grounded.

[0013] According to one embodiment of this utility model, the motor control module includes a thyristor control unit and a relay control unit. The thyristor control unit includes resistors R23 and R24, transistor Q2, resistor R25, resistor RJ6, an RC assembly, and a bithyristor TR1. One end of resistor R23 is connected to the MCU, and the other end is connected to the base of transistor Q2. The emitter of transistor Q2 is grounded. Resistor R24 ​​is connected between the base and emitter of transistor Q2. Resistors R25 and RJ6 are connected in series to the collector of transistor Q2. One end of the RC assembly is connected to resistor RJ6 and the gate of bithyristor TR1, and the other end is connected to the output of the EMI filter unit. The relay control unit includes resistors R14 and R16, transistor Q1, resistor JP5, diode D6, and relay RL1. One end of resistor R14 is connected to the MCU, and the other end is connected to the base of transistor Q1. The emitter of transistor Q1 is grounded. Resistor R16 is connected between the base and emitter of transistor Q1. One end of resistor JP5 is connected to the collector of transistor Q1, and the other end is connected to the coil of relay RL1 and the positive terminal of diode D6. The other end of the coil of relay RL1 and the negative terminal of diode D6 are connected to the power supply voltage. One end of the switch of relay RL1 is connected to the AC_L terminal, and the other end is connected to the AC_N terminal.

[0014] According to one embodiment of the present invention, the MCU has a preset PID algorithm.

[0015] The beneficial effect of this utility model is that the switching power supply module connects to the AC mains power supply, converting the AC power connected to the mains into a voltage compatible with the electronic scale control chip U1, MCU, and motor control module, thus powering these components. The electronic scale control chip U1 connects to an external weighing sensor, reading the weighing data and sending it to the MCU for data parsing. After parsing, the MCU generates a control signal and sends it to the display control circuit 3. The display control circuit 3 receives the control signal and displays the weight data accordingly, thus realizing the weighing function of the food processor. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a block diagram of the control circuit of the food processor with weighing function in the embodiment; Figure 2 This is a schematic diagram of the MCU in the embodiment; Figure 3This is a schematic diagram of the electronic scale control circuit in the embodiment; Figure 4 This is a schematic diagram of the switching power supply module in the embodiment; Figure 5 This is a schematic diagram of the step-down unit in the embodiment; Figure 6 This is a schematic diagram of the motor control module in the embodiment. Figure 7 This is a schematic diagram of the Hall filter module in the embodiment; Figure 8 This is a schematic diagram of the buzzer module in the embodiment; Figure 9 This is a schematic diagram of the display control circuit in the embodiment.

[0017] Explanation of reference numerals in the attached figures 1. Electronic scale control circuit; 11. Anti-interference module; 2. Main control circuit; 21. Switching power supply module; 211. EMI filter unit; 212. Half-wave rectifier unit; 213. LC filter unit; 214. Voltage regulator chip; 215. Filter unit; 216. Step-down unit; 217. Zero-crossing unit; 22. Motor control module; 221. Thyristor control unit; 2211. RC component; 222. Relay control unit; 23. Hall filter module; 231. Hall filter unit; 232. Hall voltage divider unit; 24. Buzzer module; 3. Display control circuit; 31. LED module; 311. Display unit. Detailed Implementation

[0018] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0019] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Please refer to Figures 1-3 , Figure 1 Block diagram of the control circuit for a food processor with weighing function. Figure 2 This is a schematic diagram of an MCU. Figure 3 This is a schematic diagram of an electronic scale control circuit. This embodiment provides a control circuit for a food processor with weighing function, including an electronic scale control circuit 1, a main control circuit 2, and a display control circuit 3. The electronic scale control circuit 1 includes an electronic scale control chip U1. The main control circuit 2 includes a switching power supply module 21, an MCU 20, and a motor control module 22. The output terminals of the switching power supply module 21 are connected to the MCU 20, the motor control module 22, the electronic scale control chip U1, and the display control circuit 3, respectively, and the switching power supply module 21 provides power to the MCU 20 and the electronic scale control chip U1. The MCU 20 is connected to the electronic scale control chip U1, the motor control module 22, and the display control circuit 3.

[0021] In this example, the electronic scale control chip U1 has pins 1 through 24, and the MCU20 has pins 1 through 20. Pins 15 and 14 of the electronic scale control chip U1 are connected to pins 11 and 15 of the MCU20, respectively, to achieve data transmission.

[0022] In practical applications, the switching power supply module 21 connects to the AC mains power supply, converting the AC power into a voltage compatible with the electronic scale control chip U1, MCU 20, and motor control module 22, thus powering these components. The electronic scale control chip U1 connects to an external weighing sensor, reading the weighing data and sending it to the MCU 20 for data parsing. After parsing, the MCU 20 generates a control signal and sends it to the display control circuit 3. The display control circuit 3 receives the control signal and displays the weight data accordingly, thus realizing the weighing function of the food processor. Additionally, the MCU 20 also regulates the operation of the motor control module 22, which controls the voltage of the food processor motor according to the instructions from the MCU 20, precisely controlling the speed of the food processor.

[0023] Preferably, the MCU20 has a pre-set PID algorithm. The MCU uses the PID algorithm to accurately calculate and generate phase angle commands, and then sends the phase angle commands to the motor control module 22. The motor control module 22 controls the voltage at both ends of the motor to precisely control the motor speed.

[0024] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the switching power supply module. The switching power supply module 21 includes an EMI filter unit 211, a half-wave rectifier unit 212, an LC filter unit 213, a voltage regulator chip 214, and an output filter unit 215. The input terminal of the EMI filter unit 211 is connected to the AC mains power supply, and the output terminal of the EMI filter unit 211 is connected to the input terminal of the half-wave rectifier unit 212. The output terminal of the EMI filter unit 211 has an AC_L terminal and an AC_N terminal, and the AC_L terminal and AC_N terminal are connected to the motor control module 22. The output terminal of the half-wave rectifier unit 212 is connected to the input terminal of the LC filter unit 213. The voltage regulator chip 214 is connected to the output terminal of the LC filter unit 213, and the output filter unit 215 is connected to the output terminal of the voltage regulator chip 214. The output terminal of the filter unit 215 is connected to the MCU 20 and the electronic scale control chip U1, respectively. The output terminal of the output filter unit 215 outputs a first supply voltage to power the MCU 20 and the electronic scale control chip U1.

[0025] In this example, the EMI filter unit 211 includes a fuse F1, a varistor ZNR1, filter capacitors CX1 and CX2, a bleeder resistor R1 and R2, a common-mode inductor L3, and filter capacitors CY1 and CY2. F1 is connected to the live wire and melts when the input current is too high, preventing damage to subsequent components. The varistor ZNR1 is connected in parallel between the live and neutral wires and is used to absorb surge voltage. Filter capacitors CX1 and CX2 are connected in parallel between the live and neutral wires for filtering. The common-mode inductor L3 is used to suppress common-mode interference and improve the purity of the input power supply. Filter capacitors CY1 and CY2 are used to eliminate differential-mode interference between the live and neutral wires, further purifying the input power supply. The half-wave rectifier unit 212 includes diodes D1 and D7, which are used to convert the AC output from the EMI filter unit 211 into DC power. The DC power output from the EMI filter unit 211 is input to the LC filter unit 213. The LC filter unit 213 is used to reduce the ripple of the DC power and output a smooth electrical signal. The LC filter unit 213 includes capacitors E1 and E2 and inductor L1. Capacitors E1 and E2 are connected in parallel to the output of the half-wave rectifier unit 212, and inductor L1 is connected in series to the output of the half-wave rectifier unit 212. The electrical signal output from the LC filter unit 213 is input to the voltage regulator chip 214, and is stepped down by the voltage regulator chip 214, resulting in a stable electrical signal output by the voltage regulator chip 214. Then, the output filter unit 215 filters the electrical signal output by the voltage regulator chip 214, thereby outputting a smooth first supply voltage. In this example, the first supply voltage is +5V. The output filter unit 215 includes capacitors EC4 and C1, resistors R6 and C2, and resistor R7. Capacitors C1 and C2 are used for filtering. Capacitor EC4 is a polarized capacitor used for energy storage. When the electrical signal output by the voltage regulator chip 214 is unstable, capacitor EC4 discharges to maintain a stable output for the switching power supply module 21.

[0026] Please refer to Figure 5 , Figure 5This is a schematic diagram of the step-down unit. The switching power supply module 21 also includes a step-down unit 216, which includes capacitor C4, resistor R9, Zener diode Q4, capacitor C5, and capacitor EC3. One end of capacitor C4 is connected to the output terminal of output filter unit 215, and the other end is grounded. One end of resistor R9 is connected to both the output terminal of output filter unit 215 and capacitor C4, and the other end is connected to the collector of Zener diode Q4. The base of Zener diode Q4 is grounded, and the emitter of Zener diode Q4 is connected to one end of capacitor C5 and capacitor EC3, respectively. The other ends of capacitor C5 and capacitor EC3 are grounded. In this example, capacitor C5 is used to receive the first supply voltage and filter it, making the electrical signal input to Zener diode Q4 smoother. Resistor R9 is used for current limiting to protect Zener diode Q4. Zener diode Q4 is used to step down the input current. Capacitor C5 is used to filter the electrical signal output from Zener diode Q4, and capacitor EC3 is used for energy storage. The electrical signal output from Zener diode Q4 is converted into the second supply voltage output after passing through capacitors C5 and EC3. In this example, the second supply voltage is +3.3V.

[0027] Please refer to Figure 4 The switching power supply module 21 also includes a zero-crossing unit 217, which includes resistors R10 and R11, diodes D5 and D4, and capacitor C6. One end of resistor R10 is connected to the output of EMI filter unit 211, and its other end is connected in series with resistor R11. The other end of resistor R11 is connected to pin 7 of MCU 20. Resistors R10 and R11 are used for current limiting. The cathode of diode D5 is connected to resistor R11 and pin 7 of MCU 20, and the anode of diode D5 is grounded. The anode of diode D4 is connected to resistor R11 and pin 7 of MCU 20, and its other end is connected to the first supply voltage. Diodes D5 and D4 are used for limiting the electrical signal. One end of capacitor C6 is connected to pin 7 of MCU 20, and its other end is grounded. Capacitor C6 is used for filtering.

[0028] Please refer to Figure 6 , Figure 6This is a schematic diagram of the motor control module. The motor control module 22 includes a thyristor control unit 221 and a relay control unit 222. The thyristor control unit 221 includes resistors R23 and R24, transistor Q2, resistors R25 and RJ6, an RC component 2211, and a bithyristor TR1. One end of resistor R23 is connected to pin 10 of the MCU 20, and the other end is connected to the base of transistor Q2. Resistor R23 is used for current limiting. The emitter of transistor Q2 is grounded. Resistor R24 ​​is connected between the base and emitter of transistor Q2, and resistor R24 ​​is used to provide bias voltage to transistor Q2. Resistors R25 and RJ6 are connected in series with the collector of transistor Q2, and resistors R25 and RJ6 are used for current limiting. One end of the RC component 2211 is connected to resistor RJ6 and the gate (G) of bithyristor TR1, and the other end is connected to the AC_L node of the output of the EMI filter unit 211. The relay control unit 222 includes resistors R14 and R16, transistor Q1, resistor JP5, diode D6, and relay RL1. One end of resistor R14 is connected to pin 9 of MCU20, and the other end is connected to the base of transistor Q1; resistor R14 is used for current limiting. The emitter of transistor Q1 is grounded, and resistor R16 is connected between the base and emitter of transistor Q1; resistor R16 is used to provide bias voltage to transistor Q1. One end of resistor JP5 is connected to the collector of transistor Q1, and the other end is connected to the coil of relay RL1 and the anode of diode D6; resistor JP5 is used for current limiting. The other end of the coil of relay RL1 and the cathode of diode D6 are connected to a +12V power supply. One end of relay RL1 is connected to the AC_L terminal, and the other end is connected to the AC_N terminal.

[0029] In practical applications, the AC_L terminal is used to connect the motor's live wire, and the AC_N terminal is used to connect the motor's neutral wire. The thyristor control unit 221 controls the on / off state of AC_L, and the relay control unit 222 controls the on / off state of AC_N. During operation, the MCU20 detects the zero-crossing point of the AC current in the circuit through the zero-crossing unit 217. When the MCU20 receives a zero-crossing signal, its ninth pin sends a high-level signal. After current limiting by resistor R14, transistor Q1 receives the high-level signal from the MCU20's ninth pin, causing transistor Q1 to conduct. With transistor Q1 conducting, the coil of relay RL1 is energized, and the contacts of relay RL1 close, thus connecting AC_N. When the MCU20's tenth pin sends a high-level signal, the base of transistor Q2 is high, transistor Q2 conducts, and the dual thyristor TR1 conducts. When the MCU20's tenth pin sends a low-level signal, transistor Q2 is cut off, and the dual thyristor TR1 does not conduct. Thus, the MCU20 controls the conduction state of transistor Q2 by sending a high-level signal or a low-level signal, thereby controlling the conduction time of the dual thyristor TR1.

[0030] In practical applications, the zero-crossing unit 217 is connected between the output of the EMI filter unit 211 and the MCU 20, providing a zero-crossing signal for AC power to the MCU 20. The MCU 20 turns on the AC_N terminal based on the zero-crossing signal, calculates and generates a phase angle command using its built-in PID algorithm, and then generates high-level and low-level signals on the tenth pin according to the phase angle command to control the SCR control unit 221. The SCR control unit 221 controls the conduction time of the dual thyristor TR1 based on the high-level or low-level signal sent by the MCU 20, thereby adjusting the voltage across the motor and changing the motor speed. The relay control unit 222 controls the on / off state of AC_N based on the high-level or low-level signal sent by the MCU 20.

[0031] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the Hall filter module. The control circuit of the food processor with weighing function also includes a Hall filter module 23. The Hall filter module 23 includes an interface HR1, a Hall filter unit 231, and a Hall voltage divider unit 232. The interface HR1 has three terminals, and is used to connect the MCU20 to an external Hall sensor. The Hall filter unit 231 includes capacitors C15 and C12, and the Hall voltage divider unit 232 includes resistors R37, R35, RJ11, and RJ3. During connection, resistors R35, RJ11, and RJ3 are connected in series between terminal one of interface HR1 and the MCU20. Resistors R37, RJ11, and RJ3 are used for current limiting. One end of capacitor C15 is connected to terminal one of interface HR1 and resistor R35, and the other end is grounded. Capacitor C15 is used for filtering. One end of resistor R37 is connected to terminal 1 of interface HR1 and resistor R35, and the other end is connected to switching power supply module 21 to receive the first supply voltage. One end of capacitor C12 is connected to resistor R35 and resistor RJ11, and the other end is grounded. Capacitor C12 is used for filtering. The first supply voltage output by switching power supply module 21 is current-limited by resistor R38 and then input to terminal 3 of input interface HR1.

[0032] Please refer to Figure 8 , Figure 8This is a schematic diagram of the buzzer module. The control circuit of the food processor with weighing function also includes a buzzer module 24, which is controlled by the MCU 20 and is used to activate and alarm when the food processor malfunctions. The buzzer module 24 includes resistors RJ2, R36, R41, transistor Q3, resistors R34, R33, and buzzer Buz1. Resistors RJ2 and R36 are connected in series between pin 12 of the MCU 20 and the base of transistor Q3, and are used for current limiting. The emitter of transistor Q3 is grounded, and resistor R41 is connected between the base and emitter of transistor Q3 to provide a bias voltage. One end of resistor R34 is connected to the collector of transistor Q3, and the other end is connected to resistor R33. The other end of resistor R33 is connected to the first supply voltage. The A and B pins of buzzer Buz1 are connected to the two ends of resistor R33, respectively. Resistors R33 and R34 are used for current limiting to protect the buzzer Buz1 and transistor Q3.

[0033] In practical applications, if the food processor malfunctions, pin 12 of MCU20 outputs a high-level signal, causing the base of transistor Q3 to be high. Transistor Q3 then conducts, powering on buzzer Buz1 and triggering an alarm. When pin 12 of MCU20 outputs a low-level signal, transistor Q3 is cut off, and buzzer Buz1 is de-energized and silenced.

[0034] Please refer to Figure 3 The electronic scale control circuit 1 also includes an anti-interference module 11, interfaces J1, J2, and J3. Interfaces J1, J2, and J3 are used to connect to one weighing sensor each, enabling the connection of three weighing sensors to the MCU 20. Interfaces J1, J2, and J3 each have a first connection pin, a second connection pin, a third connection pin, and a fourth connection pin. The first connection pins of interfaces J1, J2, and J3 are all grounded. The fourth connection pins of interfaces J1, J2, and J3 are connected to the fifth pin of the electronic scale control chip U1, which is the VS pin. One end of resistor R6 is connected to the seventh pin of the electronic scale control chip U1, and the other end is connected to interfaces J1, J2, and J3; resistor R6 is used for current limiting. One end of capacitor C16 is connected to the seventh pin of the electronic scale control chip U1, and the other end is grounded; capacitor C16 is used for filtering. One end of resistor R7 is connected to pin 8 of the electronic scale control chip U1, and the other end is connected to interfaces J1, J2, and J3. Resistor R7 is used for current limiting. One end of capacitor C18 is connected to pin 8 of the electronic scale control chip U1, and the other end is grounded. Capacitor C18 is used for filtering. The two ends of capacitor C17 are connected to pins 7 and 8 of the electronic scale control chip U1, respectively. Capacitor C17 is used for voltage regulation.

[0035] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the control circuit. The control circuit of the food processor with weighing function also includes a display control circuit 3, which includes a display control chip U2 and an LED module 31. The display control chip U2 has pins 1 to 28. Pins 7 and 8 of the display control chip U2 are connected to pins 11 and 15 of the MCU 20, respectively. Pin 17 of the display control chip U2 is connected to the switching power supply module 21 and receives the first power supply voltage. The LED module 31 includes four sets of LED display units 311, all of which are connected to and controlled by the display control chip U2. Each set of LED display units 311 includes eight LEDs connected in parallel. The display control chip U2 controls the LEDs of the four sets of LED display units 311 to light up or turn off.

[0036] In actual use, the electronic scale control chip U1 reads the data from the weighing sensor and transmits it to the MCU20. After receiving the data, the MCU20 generates a signal and sends it to the display control chip U2. The display control chip U2 controls the LEDs of the four LED display units 311 to light up or turn off according to the received signal, thus displaying the relevant weighing data through the four LED display units 311. Alternatively, the MCU20 can also send signals for the weighing level or timing to the display control chip U2. The display control chip U2 then controls the four LED display units 311 according to the signals, allowing the four LED display units 311 to display different information.

[0037] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A control circuit for a food processor with weighing function, characterized in that, include: The electronic scale control circuit (1), main control circuit (2), and display control circuit (3) are provided. The electronic scale control circuit (1) includes an electronic scale control chip U1. The main control circuit (2) includes a switching power supply module (21), a motor control module (22), and an MCU (20). The switching power supply module (21) is connected to the MCU (20), the electronic scale control chip U1, the motor control module (22), and the display control circuit (3), respectively. The MCU (20) is connected to the electronic scale control chip U1, the motor control module (22), and the display control circuit (3), respectively. The switching power supply module (21) includes an EMI filter unit (211), a half-wave rectifier unit (212), an LC filter unit (213), a voltage regulator chip (214), and an output filter unit (215). The input terminal of the EMI filter unit (211) is connected to the AC mains power supply, and the output terminal of the EMI filter unit (211) is connected to the input terminal of the half-wave rectifier unit (212). The output terminal of the EMI filter unit (211) has an AC_L terminal and an AC_N terminal. The AC_L terminal and the AC_N terminal are connected to the motor. The control module (22) is connected; the output terminal of the half-wave rectifier unit (212) is connected to the input terminal of the LC filter unit (213), the voltage regulator chip (214) is connected to the output terminal of the LC filter unit (213), the output filter unit (215) is connected to the output terminal of the voltage regulator chip (214), the output terminal of the output filter unit (215) is connected to the MCU (20), the electronic scale control chip U1 and the display control circuit (3) respectively, and the output terminal of the output filter unit (215) outputs the first power supply voltage; The switching power supply module (21) also includes a zero-crossing unit (217), which is connected between the output terminal of the EMI filter unit (211) and the MCU (20) to provide the MCU (20) with a zero-crossing signal of AC power. The motor control module (22) includes a thyristor control unit (221) and a relay control unit (222), both of which are connected to the MCU (20). The MCU (20) has a preset PID algorithm, which is used to turn on the AC_N terminal according to the zero-crossing signal of the zero-crossing unit (217), calculate and generate a phase angle command through the PID algorithm, and control the conduction time of the thyristor control unit (221) based on the phase angle command, so as to adjust the voltage at both ends of the motor and thereby change the speed of the motor.

2. The control circuit for a food processor with weighing function according to claim 1, characterized in that, The switching power supply module (21) further includes a step-down unit (216), which includes a capacitor C4, a resistor R9, a Zener diode Q4, a capacitor C5, and a capacitor EC3. One end of the capacitor C4 is connected to the output terminal of the output filter unit (215), and the other end is grounded. One end of the resistor R9 is connected to the output terminal of the output filter unit (215) and the capacitor C4, and the other end is connected to the collector of the Zener diode Q4. The base of the Zener diode Q4 is grounded. The emitter of the Zener diode Q4 is connected to one end of the capacitor C5 and the capacitor EC3, and the emitter of the Zener diode Q4 outputs a second supply voltage. The other ends of the capacitor C5 and the capacitor EC3 are grounded. The second supply voltage is connected to the electronic scale control chip U1.

3. The control circuit for a food processor with weighing function according to claim 1, characterized in that, The main control circuit (2) also includes a Hall filter module (23), which includes an interface HR1, a Hall filter unit (231), and a Hall voltage divider unit (232). The interface HR1 has a first terminal, a second terminal, and a third terminal. The Hall filter unit (231) includes capacitors C15 and C12. The Hall voltage divider unit (232) includes resistors R37, R35, RJ11, and RJ3. Resistors R35, RJ11, and RJ3 are connected in series with one of the interfaces HR1. Between the first terminal of the interface HR1 and the MCU (20), one end of the capacitor C15 is connected to the first terminal of the interface HR1 and the resistor R35, and the other end is grounded; one end of the resistor R37 is connected to the first terminal of the interface HR1 and the resistor R35, and the other end is connected to the switching power supply module (21); one end of the capacitor C12 is connected to the resistor R35 and the resistor RJ11, and the other end is grounded; the second terminal of the interface HR1 is grounded; the third terminal of the interface HR1 is connected to the switching power supply module (21) after passing through the resistor R38.

4. The control circuit for a food processor with weighing function according to claim 3, characterized in that, The main control circuit (2) also includes a buzzer module (24). The buzzer module (241) includes resistors RJ2, R36, R41, transistor Q3, R34, R33 and buzzer Buz1. One end of resistor RJ2 is connected to the MCU (20), and the other end is connected in series with resistor R36. The other end of resistor R36 is connected to the base of transistor Q3. The emitter of transistor Q3 is grounded. Resistor R41 is connected between the base and emitter of transistor Q3. One end of resistor R34 is connected to the collector of transistor Q3, and the other end is connected to resistor R33. The other end of resistor R33 is connected to the output terminal of the switching power supply module (21). The A pin and B pin of buzzer Buz1 are respectively connected to the two ends of resistor R33.

5. The control circuit for a food processor with weighing function according to claim 1, characterized in that, The electronic scale control circuit (1) further includes an anti-interference module (11), interface J1, interface J2 and interface J3. The anti-interference module (11) includes a current-limiting resistor R6, a current-limiting resistor R7, a filter capacitor C16, a filter capacitor C17 and a filter capacitor C18. One end of the resistor R6 is connected to the seventh pin of the electronic scale control chip U1, and the other end is connected to the interface J1, the interface J2 and the interface J3 respectively. One end of the capacitor C16 is connected to the seventh pin of the electronic scale control chip U1, and the other end is grounded. One end of the resistor R7 is connected to the eighth pin of the electronic scale control chip U1, and the other end is connected to the interface J1, the interface J2 and the interface J3 respectively. One end of the capacitor C18 is connected to the eighth pin of the electronic scale control chip U1, and the other end is grounded. The two ends of the capacitor C17 are connected to the seventh pin and the eighth pin of the electronic scale control chip U1 respectively.

6. The control circuit for a food processor with weighing function according to claim 1, characterized in that, It also includes a display control circuit (3), which includes a display control chip U2 and an LED module (31); the display control chip U2 is connected to the MCU (20) and the display control chip U2 is connected to the switching power supply module (21); the LED module (31) includes four LED display units (311), and each LED display unit (311) is connected to the display control chip U2.

7. The control circuit for a food processor with weighing function according to claim 1, characterized in that, The zero-crossing unit (217) includes resistors R10 and R11, diodes D5 and D4, and capacitor C6. One end of resistor R10 is connected to the output terminal of the EMI filter unit (211), and the other end is connected in series with resistor R11. The other end of resistor R11 is connected to the MCU (20). The negative terminal of diode D5 is connected to resistor R11 and the MCU (20), and the positive terminal of diode D5 is grounded. The positive terminal of diode D4 is connected to diode R11 and the MCU (20), and the other end is connected to the output terminal of the output filter unit (215). One end of capacitor C6 is connected to the MCU (20), and the other end is grounded.

8. The control circuit for a food processor with weighing function according to claim 1, characterized in that, The thyristor control unit (221) includes resistors R23 and R24, transistor Q2, resistors R25 and RJ6, an RC assembly (2211), and a bithyristor TR1; one end of resistor R23 is connected to the MCU (20), and the other end is connected to the base of transistor Q2. The emitter of transistor Q2 is grounded. Resistor R24 ​​is connected between the base and emitter of transistor Q2. Resistor R25 and resistor RJ6 are connected in series to the collector of transistor Q2. One end of the RC assembly is connected to resistor RJ6 and the gate of bithyristor TR1, and the other end is connected to the output of the EMI filter unit (211); the relay control unit (222) includes... The circuit includes resistors R14 and R16, transistor Q1, resistor JP5, diode D6, and relay RL1. One end of resistor R14 is connected to the MCU (20), and the other end is connected to the base of transistor Q1. The emitter of transistor Q1 is grounded. Resistor R16 is connected between the base and emitter of transistor Q1. One end of resistor JP5 is connected to the collector of transistor Q1, and the other end is connected to the coil of relay RL1 and the anode of diode D6. The other end of the coil of relay RL1 and the cathode of diode D6 are connected to the power supply voltage. One end of the switch of relay RL1 is connected to the AC_N terminal, and the other end is connected to the AC_L terminal.

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