Speed regulation circuit of electric stirrer

Abstract

A speed regulation circuit of an electric stirrer relates to the technical field of control circuits. The device comprises a first switch, a motor speed regulation circuit and a rectification circuit, the first switch is connected with a control end and a power supply input end of the motor speed regulation circuit, and the motor speed regulation circuit is connected with an input end of the rectification circuit. According to the embodiment of the utility model, the motor speed regulation circuit is additionally arranged, so that the problem that the flexibility and the adaptability of the existing electric stirrer only with a fixed gear in the market are insufficient when coping with different materials and processing conditions is effectively solved, and a user can accurately control the running speed of the motor according to specific stirring requirements; the charging time of the RC loop is influenced by adjusting the potentiometer, and then the conduction angle of the SCR and the current flowing to the input end of the rectifying circuit are accurately adjusted, so that the stirring speed is finely adjusted and controlled, and the consistency of the stirring effect and the processing quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, and particularly relates to a speed regulation circuit for an electric mixer. Background Art

[0002] With the improvement of living standards, electric mixers have been gradually popularized in families and industries, and are widely used in many fields such as modern kitchens, food processing, chemical mixing, and the preparation of building materials.

[0003] However, electric mixers currently on the market usually only have two fixed gears, which to a certain extent limits their flexibility and adaptability in use. For example, when preparing foods such as flour or rice paste, a fixed-gear electric mixer cannot be finely adjusted, so it cannot adapt to different viscosities and textures, which often leads people to return to manual stirring. Summary of the Utility Model

[0004] The purpose of the utility model is to address the defects and deficiencies of the prior art. On the one hand, a speed regulation circuit for an electric mixer is provided, which includes a first switch, a motor speed regulation circuit, and a rectification circuit. The first switch is connected to the control end and the power input end of the motor speed regulation circuit. The motor speed regulation circuit is connected to the input end of the rectification circuit. The motor speed regulation circuit includes a potentiometer S1, a first resistor R1, a second resistor R4, a first trigger diode D1, a first capacitor C2, and a thyristor SCR. One end of the potentiometer S1 is connected to the first switch, the other end of the potentiometer S1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R4 and one end of the first capacitor C2, the other end of the second resistor R4 is connected to one end of the diode D1, the other end of the diode D1 is connected to the gate of the thyristor SCR, the first main electrode of the thyristor SCR is connected to the first switch, and the second main electrode of the thyristor SCR is connected to the input end of the rectification circuit and the other end of the first capacitor C2;

[0005] The rectification circuit includes a rectifier bridge DB1 and a second capacitor C5. The rectifier bridge DB1 includes a first port, a second port, a third port, and a fourth port. The third port is connected to the output end of the motor speed regulation circuit and the first switch. The first port is connected to the power output end. The second port is connected to one end of the second capacitor C5 and the positive electrode of the motor. The fourth port is connected to the other end of the second capacitor C5 and the negative electrode of the motor.

[0006] The rectification circuit further includes a thermistor NTC. The fourth port is connected to one end of the thermistor NTC, and the other end of the thermistor NTC is connected to the other end of the second capacitor C5 and the negative electrode of the motor.

[0007] It further includes a second switch, and the second switch is connected to the third port.

[0008] A filtering module is further provided between the power input terminal and the output terminal. The filtering module includes a third capacitor C1. One end of the third capacitor C1 is connected to the power input terminal, and the other end is connected to the power output terminal.

[0009] A fuse F1 is further provided between the power input terminal and the first switch and the second switch.

[0010] An overvoltage protection module is further provided between the power input terminal and the output terminal. The overvoltage protection module includes a zener diode VDR. One end of the zener diode VDR is connected to the power input terminal, and the other end is connected to the power output terminal.

[0011] A voltage dividing protection module is further provided between the power input terminal and the output terminal. The overvoltage protection module includes a third resistor R2 and a fourth resistor R3. One end of the third resistor R2 is connected to the power input terminal, the other end of the third resistor R2 is connected to one end of the fourth resistor R3, and the other end of the fourth resistor R3 is connected to the power output terminal.

[0012] The specification of the fuse is selected as 1.2 - 1.5 times of the rated current of the whole machine.

[0013] On the other hand, the present invention further provides an electric mixer, including the electric mixer speed regulation circuit of the above technical solution.

[0014] By adding a motor speed regulation circuit in the embodiment of the present invention, the problem of insufficient flexibility and adaptability of the existing electric mixer with only fixed gears in the market when dealing with different materials and processing conditions is effectively overcome. Users can accurately control the running speed of the motor according to specific mixing requirements. By adjusting the potentiometer, the charging time of the RC circuit is affected, and then the conduction angle of the SCR and the current flowing into the input end of the rectifier circuit are accurately adjusted, so as to realize the fine regulation of the mixing speed and improve the consistency of the mixing effect and the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is the structural block diagram of the first embodiment of the present invention;

[0017] Figure 2It is the structural block diagram of the second embodiment of the present utility model;

[0018] Figure 3 It is the circuit diagram of the third embodiment of the present utility model;

[0019] Reference numerals:

[0020] 1. First switch;

[0021] 2. Second switch;

[0022] 3. Motor speed regulation circuit;

[0023] 4. Rectification circuit;

[0024] 5. Filter module;

[0025] 6. Overvoltage protection module;

[0026] 7. Voltage division protection module;

[0027] 8. Fuse;

[0028] 9. Load. Detailed implementation manners

[0029] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] This specific embodiment is only an interpretation of the present utility model, and it is not a limitation of the present utility model. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present utility model, they are protected by the Patent Law.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0033] Embodiment 1:

[0034] Refer to Figure 1, a speed control circuit for an electric mixer is proposed, which includes a first switch 1, a motor speed control circuit 3 and a rectifier circuit 4. The first switch 1 is connected to the control end and the power input end of the motor speed control circuit 3, and the motor speed control circuit 3 is connected to the input end of the rectifier circuit 4.

[0035] In the embodiment of the present utility model, by adding a motor speed control circuit, the problem of insufficient flexibility and adaptability of the existing electric mixers with only fixed gears in the market when dealing with different materials and processing conditions is effectively overcome. Users can accurately control the running speed of the motor according to specific mixing requirements. By adjusting the potentiometer, the charging time of the RC circuit is affected, and then the conduction angle of the SCR and the current flowing into the input end of the rectifier circuit are accurately adjusted, so as to achieve fine control of the mixing speed and improve the consistency of the mixing effect and the processing quality.

[0036] Embodiment 2:

[0037] Refer to Figure 2 , a speed control circuit for an electric mixer is proposed, which includes a first switch 1, a second switch 2, a motor speed control circuit 3, a rectifier circuit 4, a filtering module 5, an overvoltage protection module 6, a voltage dividing protection module 7, a fuse 8 and a load 9.

[0038] Among them, the first switch 1 is connected between the motor speed control circuit 3 and the overvoltage protection module 6.

[0039] The second switch 2 is connected to the voltage dividing protection module 7 and also connected to the motor speed control circuit 3.

[0040] The motor speed control circuit 3 receives the input from the rectifier circuit 4, and the motor speed control circuit 3 outputs to the first switch 1.

[0041] The rectifier circuit 4 receives the input from the load 9.

[0042] The rectifier circuit 4 outputs to the motor speed control circuit 3.

[0043] The filtering module 5 is connected between the overvoltage protection module 6 and the fuse 8.

[0044] One end of the overvoltage protection module 6 is connected to the first switch 1, and the other end is connected to the filtering module 5.

[0045] One end of the voltage dividing protection module 7 is connected to the second switch 2, and the other end is connected to the load 9.

[0046] The fuse 8 is connected between the filtering module 5 and the power input end.

[0047] The load 9 is connected between the rectifier circuit 4 and the voltage dividing protection module 7.

[0048] Specifically, in the speed control circuit of an electric blender, the mains power enters the circuit through a fuse, which provides overcurrent protection. After the power signal is connected to the circuit, there are two branches:

[0049] High - gear working mode:

[0050] When the first switch SW1 is pressed, the mains power is rectified by the rectifier circuit 4 and directly supplies power to the motor speed control circuit 3. The motor speed control circuit then controls the speed of the motor, enabling the machine to work in high - gear.

[0051] Low - gear working mode:

[0052] When the second switch SW2 is pressed, the mains power signal is regulated by the thyristor and then rectified by the rectifier circuit 4 before being supplied to the motor speed control circuit 3. The motor speed control circuit controls the motor speed according to the regulated signal, enabling the machine to work in low - gear.

[0053] In these two working modes, the motor speed control circuit 3 receives the DC signal from the rectifier circuit 4 and adjusts the speed of the motor according to the different input signals (directly rectified from the mains power or rectified after being regulated by the thyristor). By adjusting the resistance value of the potentiometer S1, the speed of the motor can be further changed, thus achieving fine speed control.

[0054] Embodiment 3:

[0055] Referring to Figure 3 , a speed control circuit for an electric blender is proposed, which includes a first switch 1, a second switch 2, a motor speed control circuit 3, a rectifier circuit 4, a filtering module 5, an over - voltage protection module 6, a voltage - dividing protection module 7, a fuse 8, and a load 9.

[0056] Specifically, the motor speed control circuit 3 includes a potentiometer S1, a first resistor R1, a second resistor R4, a first trigger diode D1, a first capacitor C2, and a thyristor SCR. One end of the potentiometer S1 is connected to the first switch 1, the other end of the potentiometer S1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R4 and one end of the first capacitor C2, the other end of the second resistor R4 is connected to one end of the diode D1, the other end of the diode D1 is connected to the gate of the thyristor SCR, the first main electrode of the thyristor SCR is connected to the first switch 1, and the second main electrode of the thyristor SCR is connected to the input end of the rectifier circuit 4 and the other end of the first capacitor C2;

[0057] Among them, the voltage adjusted by the potentiometer S1 is charged through R1 and C2. When the voltage accumulates to the trigger voltage of D1, D1 conducts and sends a trigger pulse to the gate of the thyristor SCR. The thyristor SCR starts to conduct, allowing current to flow to the input end of the rectifier circuit 4. By adjusting the resistance value of the potentiometer S1, the charging time of the RC circuit is affected, and thus the conduction angle of the SCR and the current flowing to the input end of the rectifier circuit 4 are adjusted.

[0058] In this embodiment, the adjustment of the potentiometer S1 realizes the precise control of the motor speed. The voltage adjustment of the potentiometer S1 is through the RC charging circuit of R1 and C2. When the voltage accumulates to the trigger voltage of D1, D1 conducts and sends a trigger pulse to the gate of the thyristor SCR, so that the SCR conducts, allowing current to flow to the input end of the rectifier circuit 4. The change in the resistance value of the potentiometer S1 affects the charging time of the RC circuit, and then adjusts the conduction angle of the SCR and the current flowing to the input end of the rectifier circuit 4, realizing the high-precision adjustment of the motor speed. The system can realize the high-speed and low-speed operation of the motor by simply adjusting the potentiometer S1, and has the advantages of simple structure, wide speed regulation range, and high control precision.

[0059] Optionally, the rectifier circuit 4 includes a rectifier bridge DB1 and a second capacitor C5. The rectifier bridge DB1 includes a first port, a second port, a third port, and a fourth port. The third port is connected to the output end of the motor speed regulation circuit 3 and the first switch 1. The first port is connected to the power supply output end. The second port is connected to one end of the second capacitor C5 and the positive electrode of the motor. The fourth port is connected to the other end of the second capacitor C5 and the negative electrode of the motor.

[0060] In this embodiment, through the configuration of the rectifier bridge DB1 and the second capacitor C5, the efficient conversion of alternating current to direct current is realized. The third port of the rectifier bridge DB1 is connected to the output end of the motor speed regulation circuit 3 and the first switch, ensuring that the signal output from the speed regulation circuit can be stably rectified. The first port is connected to the power supply output end to provide power input. The second port is connected to the second capacitor C5 and the positive electrode of the motor. The fourth port is connected to the other end of the second capacitor C5 and the negative electrode of the motor. The second capacitor C5 smooths and filters the rectified direct current, reducing voltage fluctuations and noise, improving the stability and efficiency of the motor operation, realizing the stable power supply to the motor. The circuit design is simple and efficient, ensuring that the motor can obtain a smooth and stable direct current power supply in different working modes.

[0061] Optionally, the rectifier circuit 4 further includes a thermistor NTC. The fourth port is connected to one end of the thermistor NTC, and the other end of the thermistor NTC is connected to the other end of the second capacitor C5 and the negative electrode of the motor.

[0062] In this embodiment, by adding a thermistor NTC to the rectifier circuit, the safety and stability of the circuit are further improved. The thermistor NTC increases the resistance when the current is too large, protecting the motor and the rectifier circuit from overcurrent impact. At the same time, in cooperation with the second capacitor C5, it further smooths the voltage fluctuation to ensure the stable operation of the motor.

[0063] Optionally, it further includes a second switch 2, and the second switch 2 is connected to the third port.

[0064] In this embodiment, by adding the second switch 2 to connect the third port of the rectifier bridge, the flexible switching of the motor working mode is realized. The user can select different power paths through the second switch, so as to freely switch between high and low speed working modes, improving the usability and functional diversity of the motor speed control circuit. At the same time, the accuracy and reliability of circuit control are further improved.

[0065] Optionally, a filtering module 5 is further provided between the power input terminal and the output terminal. The filtering module 5 includes a third capacitor C1. One end of the third capacitor C1 is connected to the power input terminal, and the other end is connected to the power output terminal.

[0066] In this embodiment, by adding the filtering module 5 including the third capacitor C1 between the power input terminal and the output terminal, the effective filtering of the power signal is realized. The third capacitor C1 is connected between the power input terminal and the output terminal, which helps to eliminate high-frequency noise and electromagnetic interference in the power supply, improving the overall stability of the circuit and the operating efficiency of the motor, and ensuring that the motor obtains a smoother and more stable power supply under various working modes.

[0067] Optionally, a fuse 8F1 is further provided between the power input terminal and the first switch 1 and the second switch 2.

[0068] In this embodiment, by adding the fuse 8F1 between the power input terminal and the first switch 1 and the second switch 2, overcurrent protection is provided. When the current is too large, the fuse 8F1 will blow, cutting off the power supply to prevent the circuit and the motor from being damaged due to overcurrent, improving the safety and reliability of the entire system, and ensuring the stable operation of the electric mixer under various working conditions.

[0069] Optionally, an overvoltage protection module 6 is further provided between the power input terminal and the output terminal. The overvoltage protection module 6 includes a zener diode VDR. One end of the zener diode VDR is connected to the power input terminal, and the other end is connected to the power output terminal.

[0070] In this embodiment, overvoltage protection for the circuit is achieved by adding an overvoltage protection module 6 between the power input terminal and the output terminal, which includes a zener diode VDR. When the power supply voltage exceeds the set value, the zener diode VDR conducts, shunting the excessive voltage to prevent damage to the circuit and the motor caused by overvoltage, improving the voltage withstand capacity and overall reliability of the circuit, and ensuring that the electric blender can still operate stably and safely under voltage fluctuations.

[0071] Optionally, a voltage-dividing protection module 7 is further provided between the power input terminal and the output terminal. The overvoltage protection module 6 includes a third resistor R2 and a fourth resistor R3. One end of the third resistor R2 is connected to the power input terminal, the other end of the third resistor R2 is connected to one end of the fourth resistor R3, and the other end of the fourth resistor R3 is connected to the power output terminal.

[0072] In this embodiment, by adding a voltage-dividing protection module 7 between the power input terminal and the output terminal, which includes a third resistor R2 and a fourth resistor R3, with the third resistor R2 connected between the power input terminal and the fourth resistor R3, and the fourth resistor R3 connected to the power output terminal, this design realizes voltage distribution and balance through resistor voltage division, effectively reducing the impact of the power supply voltage on the subsequent circuit, preventing damage to the circuit and the motor caused by sudden voltage changes, improving the flexibility of power management and the stability of the circuit, and ensuring the safe and stable operation of the electric blender under different voltage conditions.

[0073] Optionally, the specification of the fuse 8 is selected as 1.2 - 1.5 times the rated current of the whole machine.

[0074] In this embodiment, by selecting a fuse 8 with a specification of 1.2 - 1.5 times the rated current of the whole machine, appropriate overcurrent protection is provided, ensuring that it does not overload under normal working conditions, and can be quickly melted in case of overcurrent to prevent damage to the circuit and the motor, improving the safety and reliability of the system, and ensuring the stable operation of the electric blender.

[0075] The above is only used to illustrate the technical solution of the present invention rather than to limit it. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An electric mixer speed control circuit, characterized in that, It includes a first switch (1), a motor speed control circuit (3), and a rectifier circuit (4). The first switch (1) is connected to the control end and the power input end of the motor speed control circuit (3). The motor speed control circuit (3) is connected to the input end of the rectifier circuit (4). The motor speed control circuit (3) includes a potentiometer S1, a first resistor R1, a second resistor R4, a first trigger diode D1, a first capacitor C2, and a thyristor SCR. One end of the potentiometer S1 is connected to the first switch (1), the other end of the potentiometer S1 is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the second resistor R4 and one end of the first capacitor C2. The other end of the second resistor R4 is connected to one end of the diode D1. The other end of the diode D1 is connected to the gate of the thyristor SCR. The first main electrode of the thyristor SCR is connected to the first switch (1), and the second main electrode of the thyristor SCR is connected to the input end of the rectifier circuit (4) and the other end of the first capacitor C2.

2. The speed control circuit of an electric blender according to claim 1, characterized in that, The rectifier circuit (4) includes a rectifier bridge DB1 and a second capacitor C5. The rectifier bridge DB1 includes a first port, a second port, a third port, and a fourth port. The third port is connected to the output end of the motor speed control circuit (3) and the first switch (1). The first port is connected to the power output end. The second port is connected to one end of the second capacitor C5 and the positive electrode of the motor. The fourth port is connected to the other end of the second capacitor C5 and the negative electrode of the motor.

3. The speed control circuit of an electric blender according to claim 2, characterized in that, The rectifier circuit (4) further includes a thermistor NTC. The fourth port is connected to one end of the thermistor NTC, and the other end of the thermistor NTC is connected to the other end of the second capacitor C5 and the negative electrode of the motor.

4. The speed control circuit of an electric mixer according to claim 2, wherein, It further includes a second switch (2), and the second switch (2) is connected to the third port.

5. The speed control circuit of an electric mixer according to claim 1 or 4, characterized in that A filter module (5) is also provided between the power input end and the output end. The filter module (5) includes a third capacitor C1. One end of the third capacitor C1 is connected to the power input end, and the other end is connected to the power output end.

6. The speed control circuit of an electric mixer according to claim 4, wherein A fuse (8) F1 is also provided between the power input end and the first switch (1) and the second switch (2).

7. The speed control circuit of an electric mixer according to claim 1 or 4, characterized in that An overvoltage protection module (6) is also provided between the power input end and the output end. The overvoltage protection module (6) includes a zener diode VDR. One end of the zener diode VDR is connected to the power input end, and the other end is connected to the power output end.

8. The speed control circuit of an electric blender according to claim 1 or 4, characterized in that, A voltage dividing protection module (7) is also provided between the power input end and the output end. The overvoltage protection module (6) includes a third resistor R2 and a fourth resistor R3. One end of the third resistor R2 is connected to the power input end, the other end of the third resistor R2 is connected to one end of the fourth resistor R3, and the other end of the fourth resistor R3 is connected to the power output end.

9. The speed control circuit of an electric mixer according to claim 6, wherein The specification of the fuse (8) is selected as 1.2 - 1.5 times of the rated current of the whole machine.

10. An electric blender, characterized in that, It includes an electric mixer speed control circuit as described in any one of claims 1 - 9.

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