Driving circuit of multifunctional chef machine

Abstract

The utility model discloses a driving circuit of a multifunctional chef machine, which comprises a power supply circuit, the input end of the power supply circuit is electrically connected with alternating current commercial power, and alternating current is converted into direct current to be output; the single chip microcomputer receives the signal and outputs the signal to control the start and stop of the motor control circuit; the input end of the motor control circuit is electrically connected with a zero line segment of the power supply circuit, the output end of the motor control circuit is electrically connected with the alternating current motor, the motor control circuit is electrically connected with the single chip microcomputer, the motor control circuit comprises a relay RY1 and a bidirectional silicon controlled rectifier T1, and the relay RY1 and the bidirectional silicon controlled rectifier T1 are connected in series. The single-chip microcomputer outputs signals to trigger conduction of the relay RY1 and the bidirectional silicon controlled rectifier T1. The single-chip microcomputer controls starting, stopping and the rotating speed of the alternating-current motor. And the zero-cross detection circuit is electrically connected with the power supply circuit and the single-chip microcomputer respectively, and the zero-cross detection circuit outputs a zero-cross signal to the single-chip microcomputer.

Description

Technical Field

[0001] This utility model relates to the field of circuit and food processor technology, and in particular to a drive circuit for a multi-functional food processor. Background Technology

[0002] A stand mixer is a multi-functional kitchen appliance that can knead dough, beat eggs, and mix ingredients. Its basic principle is to use a motor and gears to drive the mixing paddle, whisk, and other attachments to evenly mix various ingredients.

[0003] Stand mixers typically have multiple speed settings to perform specific tasks, such as using speed 2-3 for kneading dough and speed 5 or higher for beating eggs and mixing. Therefore, stand mixers generally use DC motors. However, the manufacturing cost of DC motors is quite high, so to reduce manufacturing costs, AC motors are generally being used in lower-speed stand mixers as well. Utility Model Content

[0004] The purpose of this invention is to provide a drive circuit for a multi-functional food processor. The drive circuit drives an AC motor to rotate, thereby driving the food processor. The drive circuit uses a bidirectional thyristor to control the current flowing through the AC motor, thereby controlling the speed of the AC motor and enabling precise adjustment of multiple speed settings in the food processor. Moreover, the drive circuit has a simple structure, further saving manufacturing costs.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a drive circuit for a multi-functional chef's machine, including a power supply circuit, wherein the input terminal of the power supply circuit is electrically connected to AC mains power and converts AC power into DC power output.

[0006] A microcontroller that receives signals and outputs signals to control the start and stop of the motor control circuit;

[0007] The motor control circuit has an input terminal electrically connected to the neutral segment of the power supply circuit, an output terminal electrically connected to the AC motor, and a microcontroller electrically connected to the microcontroller. The motor control circuit includes a relay RY1 and a bidirectional thyristor T1 connected in series. The microcontroller outputs signals to trigger the conduction of the relay RY1 and the bidirectional thyristor T1, and controls the start, stop, and speed of the AC motor.

[0008] A zero-crossing detection circuit is provided, which is electrically connected to the power supply circuit and the microcontroller, and outputs a zero-crossing signal to the microcontroller.

[0009] By adopting the above technical solution, the operation of the AC motor is jointly controlled by a relay and a bidirectional thyristor. At the same time, the speed of the AC motor is adjusted by controlling the magnitude of the current flowing through it through the bidirectional thyristor, thereby realizing the multi-level adjustment of the food processor.

[0010] A further feature of this invention is that the motor control circuit includes a PNP transistor Q2 and an NPN transistor Q3. The PNP transistor Q2 is connected to a bidirectional thyristor T1 to control the current flowing through the bidirectional thyristor T1, and the NPN transistor Q3 is connected to a relay RY1 to control the activation or deactivation of the relay RY1.

[0011] A further feature of this invention is that the collector of the PNP transistor Q2 is connected to the control electrode of the bidirectional thyristor T1, the base of the PNP transistor Q2 is connected to the microcontroller, and the emitter of the PNP transistor Q2 is connected to a 5V DC voltage.

[0012] A further feature of this invention is that the base of the NPN transistor Q3 is connected to a microcontroller, the emitter of the NPN transistor Q3 is connected to a ground point, the collector of the NPN transistor Q3 is connected to a relay RY1, and a resistor R15 is connected between the emitter and base of the NPN transistor Q3.

[0013] A further feature of this invention is that the zero-crossing detection circuit includes an NPN transistor Q1, the collector of the NPN transistor Q1 is connected to a 5V DC voltage, the base of the NPN transistor Q1 is connected to the live wire of the power supply circuit, the emitter of the NPN transistor Q1 is connected to the ground point, and the collector of the NPN transistor Q1 is connected to a microcontroller.

[0014] A further feature of this invention is that it includes a heating circuit, which is electrically connected to the microcontroller, the power supply circuit, and the heating element. The heating circuit receives a signal from the microcontroller to trigger the neutral segment in the power supply circuit to be connected to the negative terminal of the heating element.

[0015] A further feature of this invention is that the heating circuit includes a relay RY2 and a bidirectional thyristor T2, the relay RY2 and the bidirectional thyristor T2 are connected in series, the output terminal of the relay RY2 is connected to the negative terminal of the heating element, and the input terminal of the bidirectional thyristor T2 is connected to the neutral segment of the power supply circuit.

[0016] A further feature of this invention is that the heating circuit also includes an NPN transistor Q4, the collector of the NPN transistor Q4 is connected to a relay RY1, the emitter of the NPN transistor Q4 is connected to a ground point, and the base of the NPN transistor Q4 is connected to a microcontroller.

[0017] A further feature of this invention is that a resistor R23 is connected between the base of the NPN transistor Q4 and the emitter of the NPN transistor Q4.

[0018] A further feature of this invention is that the control electrode of the bidirectional thyristor T2 is connected to a microcontroller.

[0019] Compared with the prior art, this utility model has the following advantages: 1. It uses a relay and a bidirectional thyristor in series to control the start of the AC motor, and at the same time controls the current through the bidirectional thyristor to control the speed of the AC motor, thereby achieving precise adjustment of multiple gears of the stand mixer. Moreover, the drive circuit structure is simple, further saving manufacturing costs; 2. It also has a heating circuit, which uses a bidirectional thyristor to adjust the heating temperature, allowing the dough to ferment fully. Attached Figure Description

[0020] Figure 1 This is a perspective view of the food processor in the embodiment.

[0021] Figure 2 This is a cross-sectional view of the food processor in the embodiment.

[0022] Figure 3 This is a block diagram of the circuit structure of the driving circuit in the embodiment.

[0023] Figure 4 This is a circuit diagram of the driving circuit in the embodiment.

[0024] Figure 5 This is a circuit diagram of the motor control circuit in the embodiment.

[0025] Figure 6 This is a circuit diagram of the heating circuit in the embodiment.

[0026] In the diagram: 1. Power supply circuit; 2. Microcontroller; 3. Motor control circuit; 4. Zero-crossing detection circuit; 5. Heating circuit; 10. Food processor; 11. AC motor; 12. Heating element; 13. Live wire; 14. Neutral wire. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. It should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] like Figure 1-2 As shown, this embodiment discloses a drive circuit for a multi-functional food processor. The drive circuit is used to drive the AC motor 11 inside the food processor 10 to operate and the heating element 12 to heat; as shown Figure 3-4 As shown, a drive circuit for a multi-functional food processor includes a power supply circuit 1, a microcontroller 2, a motor control circuit 3, a heating circuit 5, and a zero-crossing detection circuit 4. The input terminal of the power supply circuit 1 is electrically connected to the power cord to input AC mains power. The input AC mains power is rectified and filtered into DC power through diode D3, electrolytic capacitor EC1, and electrolytic capacitor EC2. The power supply circuit 1 includes a step-down chip IC1 and a step-down chip IC2. Step-down chip IC1 steps down the DC power to 12V DC and outputs it, while step-down chip IC2 steps down the 12V DC power. The voltage is further stepped down to 5V DC output; Microcontroller 2, powered by 5V DC, receives and outputs signals to control the start and stop of motor control circuit 3 and heating circuit 5; Motor control circuit 3 is electrically connected to microcontroller 2, and receives signals from microcontroller 2 to trigger the motor control circuit 3 to run AC motor 11; Heating circuit 5 is electrically connected to microcontroller 2, and receives signals from microcontroller 2 to trigger the circuit to heat heating element 12; Zero-crossing detection circuit 4 is electrically connected to microcontroller 2 and outputs a zero-crossing signal to microcontroller 2.

[0029] like Figure 4 As shown, the power supply circuit 1 includes a live wire segment 13 and a neutral wire segment 14. Diode D3 is connected to the live wire segment 13 to rectify the input AC power. Inductor L2 is connected to the live wire segment 13. Electrolytic capacitors EC1 and EC2 are connected in parallel to the live wire segment 13 and the neutral wire segment 14. Inductor L2, electrolytic capacitors EC1 and EC2 filter the rectified current. Step-down chips IC1 and IC2 are connected in sequence to the live wire segment 13 to distribute the voltage drop of the rectified and filtered current to 12V and 5V output, respectively.

[0030] like Figure 4 , Figure 5 As shown, connection points M1 and M2 are connected to the positive and negative terminals of AC motor 11. Connection point M1 is connected to the live wire segment 13 of power supply circuit 1, and connection point M2 is connected to the neutral wire segment 14 of power supply circuit 1. The motor control circuit 3 includes relay RY1, bidirectional thyristor T1, PNP transistor Q2, and NPN transistor Q3. The main circuit output point of relay RY1 is connected to the negative terminal of the motor, and the main circuit input point of relay RY1 is connected to one terminal of bidirectional thyristor T1. The other terminal of bidirectional thyristor T1 is connected to the AC neutral wire input point in power supply circuit 1. One end of the coil side of relay RY1 is connected to a 12V DC power supply, and the other end of the coil side of relay RY1 is connected to the collector of NPN transistor Q3. At the same time, diode D6 is connected in reverse parallel to the coil side of relay RY1. The emitter of NPN transistor Q3 is connected to ground. The base of NPN transistor Q3 is connected to resistor R14 and then to the pin of microcontroller 2. The base and emitter of NPN transistor Q3 are connected to resistor R15. The positive voltage signal output by microcontroller 2 flows through resistors R14 and R15 to the ground. The base of NPN transistor Q3 is forward biased, and NPN transistor Q3 is turned on. The coil of relay RY1 is energized, and relay RY1 is energized. Microcontroller 2 outputs an electrical signal to turn on NPN transistor Q3. The 12V DC power supply in the coil of relay RY1 is connected to the ground to form a circuit, and relay RY1 is energized.

[0031] The emitter of PNP transistor Q2 is connected to a 5V DC power supply. The collector of PNP transistor Q2 is connected to one end of resistor R18. The other end of resistor R18 is connected to the control electrode of triac T1. Resistor R19 is connected to resistor R8 and the other electrode of triac T1. The base of PNP transistor Q2 is connected to resistor R17 and then to the pin of microcontroller 2. Microcontroller 2 outputs a zero-potential electrical signal to reverse bias the base of PNP transistor Q2, making PNP transistor Q2 conduct. The 5V DC power supply flows through resistors R18 and R19 to the zero electrode to form a loop, which simultaneously triggers the control electrode of triac T1, making triac T1 conduct. The microcontroller outputs a signal to control PNP transistor Q2 and NPN transistor Q3 to simultaneously turn on relay RY1 and triac T1, thus energizing the motor and enabling it to run. At the same time, it can control the charge flow of PNP transistor Q2, thereby controlling the charge flow of triac T1, to achieve the purpose of controlling the motor speed.

[0032] like Figure 4 , Figure 6As shown, connection points H1 and H2 are connected to the positive and negative terminals of the heating element. Connection point H1 is connected to the live wire segment 13 of the power supply circuit 1, and connection point H2 is connected to the neutral wire segment 14 of the power supply circuit 1. The heating circuit 5 includes a relay RY2, a bidirectional thyristor T2, and an NPN transistor Q4. The main circuit input point of the relay RY2 is connected to one terminal of the bidirectional thyristor T2, and the main circuit output point of the relay RY2 is connected to the negative terminal of the heating element 12. The other terminal of the bidirectional thyristor T2 is connected to the AC neutral wire input point in the power supply circuit 1. The control terminal of the bidirectional thyristor T2 is connected to the resistor R16 and then to the pin of the microcontroller 2. The microcontroller 2 outputs a signal to control the bidirectional thyristor T2 to conduct.

[0033] The coil control circuit of relay RY2 is the same as that of relay RY1. One end of the coil side of relay RY2 is connected to a 12V DC power supply, and the other end is connected to the collector of NPN transistor Q4. The emitter of NPN transistor Q4 is connected to the ground point. The base of NPN transistor Q4 is connected to resistor R24 ​​and then to the pin of microcontroller 2. The base and emitter of NPN transistor Q4 are connected to resistor R23. When microcontroller 2 outputs a positive voltage signal, it flows through resistors R24 and R23 to the ground point. The base of NPN transistor Q4 is forward biased, and NPN transistor Q4 is turned on. The coil of relay RY2 is energized, and relay RY2 is energized, thereby causing microcontroller 2 to output a signal to control relay RY2 to conduct.

[0034] like Figure 4 As shown, the zero-crossing detection circuit 4 includes an NPN transistor Q1. The collector of the NPN transistor Q1 is connected to one end of a resistor R20, and the other end of the resistor R20 is connected to a 5V DC voltage. The emitter of the NPN transistor Q1 is connected to ground. The base of the NPN transistor Q1 is connected to the live wire of the power supply circuit 1 via resistors R21 and R22. Resistor R20 is also connected to the microcontroller 2, which transmits the 5V voltage as a high-level signal. When the AC mains power input to the power supply circuit 1 is in the positive half-cycle, the base of the NPN transistor Q1 is triggered, the NPN transistor Q1 conducts, the 5V voltage is pulled low, and a pull-down signal is output. When the AC mains power input to the power supply circuit 1 is in the negative half-cycle, the NPN transistor Q1 is turned off, and a 5V voltage signal is output. The switching point of the electrical signal is the AC zero-crossing point.

[0035] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A drive circuit for a multi-functional food processor, characterized in that: Includes a power supply circuit (1), the input terminal of which is electrically connected to AC mains power, converting AC power into DC power output; The microcontroller (2) receives signals and outputs signals to control the start and stop of the motor control circuit (3); The motor control circuit (3) is electrically connected to the neutral segment (14) of the power supply circuit (1) at its input end and to the AC motor (11) at its output end. The motor control circuit (3) is electrically connected to the microcontroller (2). The motor control circuit (3) includes a relay RY1 and a bidirectional thyristor T1 connected in series. The microcontroller (2) outputs signals to trigger the conduction of the relay RY1 and the bidirectional thyristor T1 respectively. The microcontroller (2) controls the start, stop and speed of the AC motor (11). Zero-crossing detection circuit (4) is electrically connected to power supply circuit (1) and microcontroller (2) respectively. Zero-crossing detection circuit (4) outputs zero-crossing signal to microcontroller (2).

2. The drive circuit of a multi-functional food processor according to claim 1, characterized in that: The motor control circuit (3) also includes a PNP transistor Q2 and an NPN transistor Q3. The PNP transistor Q2 is connected to a bidirectional thyristor T1 to control the current flowing through the bidirectional thyristor T1, and the NPN transistor Q3 is connected to a relay RY1 to control the activation or deactivation of the relay RY1.

3. The drive circuit of a multi-functional food processor according to claim 2, characterized in that: The collector of the PNP transistor Q2 is connected to the control electrode of the bidirectional thyristor T1, the base of the PNP transistor Q2 is connected to the microcontroller (2), and the emitter of the PNP transistor Q2 is connected to a 5V DC voltage.

4. The drive circuit of a multi-functional food processor according to claim 2, characterized in that: The base of the NPN transistor Q3 is connected to the microcontroller (2), the emitter of the NPN transistor Q3 is connected to the ground point, the collector of the NPN transistor Q3 is connected to the relay RY1, and a resistor R15 is connected between the emitter and the base of the NPN transistor Q3.

5. The drive circuit of a multi-functional food processor according to claim 1, characterized in that: The zero-crossing detection circuit (4) includes an NPN transistor Q1. The collector of the NPN transistor Q1 is connected to a 5V DC voltage, the base of the NPN transistor Q1 is connected to the live wire (13) of the power supply circuit (1), the emitter of the NPN transistor Q1 is connected to the ground point, and the collector of the NPN transistor Q1 is connected to the microcontroller (2).

6. The drive circuit of a multi-functional food processor according to claim 1, characterized in that: It also includes a heating circuit (5), which is electrically connected to the microcontroller (2), the power supply circuit (1) and the heating element (12). The heating circuit (5) receives a signal from the microcontroller (2) to trigger the neutral segment (14) in the power supply circuit (1) to be connected to the negative terminal of the heating element (12).

7. The drive circuit for a multi-functional food processor according to claim 6, characterized in that: The heating circuit (5) includes a relay RY2 and a bidirectional thyristor T2. The relay RY2 and the bidirectional thyristor T2 are connected in series. The output terminal of the relay RY2 is connected to the negative terminal of the heating element (12). The input terminal of the bidirectional thyristor T2 is connected to the neutral segment (14) of the power supply circuit (1).

8. The drive circuit for a multi-functional food processor according to claim 7, characterized in that: The heating circuit (5) also includes an NPN transistor Q4, the collector of which is connected to a relay RY1, the emitter of which is connected to a ground point, and the base of which is connected to a microcontroller (2).

9. The drive circuit of a multi-functional food processor according to claim 8, characterized in that: A resistor R23 is connected between the base and emitter of the NPN transistor Q4.

10. The drive circuit of a multi-functional food processor according to claim 7, characterized in that: The control electrode of the bidirectional thyristor T2 is connected to the microcontroller (2).

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