Automatic whipping control circuit for juicer

Abstract

The utility model provides an automatic whipping control circuit for a juicer, which relates to the technical field of control circuits and comprises a power module, a master control module, a motor, a speed regulation module, a driving module, a zero-cross detection module and a Hall sensor. The motor is a rotating motor, and the stirring device of the juicer is driven through rotating power to stir food materials in the juicer. The speed regulation module is used for regulating the rotating speed of the motor, namely the stirring speed of the juicer. A Hall sensor is arranged in the motor and used for sensing the rotating speed of a motor rotor and sending rotating speed information to the main control module. The working state of the speed regulation module is adjusted according to the rotating speed information, so that the input power of the motor is changed, the rotating speed of the motor is adjusted, the stirring time and power are automatically optimized according to different food materials, the stirring uniformity and efficiency of the juicer are remarkably improved, meanwhile, the energy consumption is reduced, and the intelligentization of the juicer and the use convenience of a user are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to control circuit technical field especially relates to a kind of automatic whipping control circuit for juice machine. BACKGROUND

[0002] As a common small household appliance product, juice whipping machine is widely used in family, catering and other scenes, for making fresh juice, milk shake and other drinks.

[0003] Traditional juice whipping machine usually adopts single speed motor drive, and user realizes the start-stop and time control of motor by manual switch. This kind of whipping machine is simple in structure and low in cost, but at least has the following shortcomings:

[0004] (1) cannot adjust speed according to the physical properties (such as softness) of different food materials, resulting in poor whipping effect;

[0005] (2) constant high-speed drive mode is easy to cause energy waste;

[0006] (3) manual control needs user to pay attention to whipping process in real time, which increases the operation complexity.

[0007] There are also many intelligent whipping machines on the market, equipped with multi-speed adjustment function, but the control circuit is complex and the cost is high. INVENTION CONTENTS

[0008] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to provide an automatic whipping control circuit for juice machine, which adopts the following technical scheme:

[0009] An automatic whipping control circuit for juice machine, comprising a power module, a main control module and a motor, the motor is used to drive the whipping device, further comprising

[0010] A speed regulation module for adjusting the speed of the motor, comprising a thyristor and a third switch, the first electrode and the second electrode of the thyristor are connected to the AC power supply and the motor respectively, the gate electrode is connected to the AC power supply and grounded, the third switch is connected between the gate electrode and the ground terminal, the third switch receives the pulse width modulation signal output by the main control module, for controlling the conduction of the thyristor;

[0011] A drive module comprising an electromagnetic switch and a fourth switch, the electromagnetic switch is connected between the motor and the AC power supply, the electromagnetic switch comprises an electromagnetic coil, the power module, the electromagnetic coil and the fourth switch are connected in series to form the power supply circuit of the electromagnetic coil, the fourth switch is connected to the main control module, for controlling the closing and opening of the electromagnetic switch;

[0012] A zero-crossing detection module for detecting the zero-crossing point signal of the AC power supply;

[0013] A Hall sensor is installed on the motor, used for sensing the rotating speed of the motor rotor and outputting a rotating speed pulse signal to the main control module, and the main control module adjusts the rotating speed of the motor through the speed regulation module.

[0014] Further improved, it further comprises a zero-crossing detection module, the zero-crossing detection module comprises a fifth diode and a second NPN transistor, the AC power supply is connected to the base of the second NPN transistor through the fifth diode and a voltage dividing network, the collector of the second NPN transistor is connected to the power supply module, and the emitter is grounded, and the node between the collector of the second NPN transistor and the power supply module is also connected to the main control module for sending the collected zero-crossing point signal.

[0015] Further improved, a first RC filter is arranged between the first electrode and the second electrode.

[0016] Further improved, the third switch is an NPN transistor, the base of the third switch is connected to the main control module, the collector is connected to the gate of the thyristor, and the emitter is grounded.

[0017] Further improved, the positive terminal of the motor is connected to the electromagnetic switch, and the negative terminal is connected to the second electrode of the thyristor.

[0018] Further improved, the fourth switch is an NPN transistor, the base of the fourth switch is connected to the main control module, and the emitter is grounded; the power supply module supplies power to the electromagnetic coil of the electromagnetic switch and is connected to the collector of the fourth switch.

[0019] Further improved, the power supply module comprises a power supply chip of type LN8K05 and peripheral circuits thereof.

[0020] Further improved, a second RC filter and a pressure-sensitive resistor are arranged in parallel at the input end of the power supply module.

[0021] Further improved, the main control module comprises a main control chip of type SC92F8362B-SOP20 and peripheral circuits thereof.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] One, the utility model discloses a speed regulation module through the cooperation of thyristor and third switch spare in, utilize the on -angle of thyristor of the pulse width modulation signal of main control module output, realize the speed of motor is adjusted. The Hall sensor is installed in the motor, is used for inductive rotor speed, and the speed pulse signal is fed back to main control module, when the beating material material quality is hard, the resistance is bigger, and rotor speed is slow, and food is soft, and the resistance is smaller, and rotor speed is fast, and main control module passes through the speed pulse signal of Hall sensor and adjusts the duty cycle of PWM, realizes the dynamic adjustment beating speed according to the demand of different food materials, and this structure reduces the complexity of control circuit, improves the beating effect and use experience.

[0024] Second, the utility model discloses set up zero -crossing detection module, captures the zero -crossing electric signal of alternating -current power, and signal transmission is to main control module, effectively avoid the influence of phase shift and electromagnetic interference to motor speed regulation, improve the stability and response speed of control. SHEET DESCRIPTION

[0025] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the drawing needed in the embodiment used briefly introduced, should understand, the following drawing only shows some embodiments of the utility model, therefore should not be seen as the limitation to the scope, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0026] Figure 1 It is the circuit structure schematic diagram of the utility model;

[0027] Figure 2 It is the main control module schematic diagram of the utility model.

[0028] REFERENCE NUMERALS:

[0029] 1-power module;2-main control module;3-speed regulation module;4-driving module;5-zero -crossing detection module;6-Hall sensor;

[0030] AC-alternating -current power supply;M-motor;BTA-thyristor;T1-first electrode;T2-second electrode;G-gate;Q2-second NPN transistor;Q3-third switch spare;Q4-fourth switch spare;K1-electromagnetic switch;TRV1-voltage-dependent resistor;

[0031] R3 - third resistor; R4 - fourth resistor; R6 - sixth resistor; R8 - eighth current limiting resistor; R10 - tenth protective resistor; R11 - eleventh resistor; R12 - twelfth resistor; R14 - fourteenth protective resistor; R15 - fifteenth current limiting resistor; R16 - sixteenth base resistor; R17 - seventeenth current limiting resistor; R18 - eighteenth base resistor; R19 - nineteenth base resistor; R31 - thirty-first resistor; R32 - thirty-second resistor; R36 - thirty-sixth resistor;

[0032] C2 - second capacitor; C8 - eighth capacitor; C9 - ninth capacitor;

[0033] D5 - fifth diode; D6 - sixth diode. DETAILED DESCRIPTION

[0034] In order to facilitate those skilled in the art to understand, the structure of the utility model will be further described in detail in combination with the drawings:

[0035] In the description of the utility model, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. The terms "part", "side", "end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0036] An automatic whipping control circuit for a juicer, comprising a power supply module 1, a main control module 2, a motor M, a speed regulation module 3, a drive module 4, a zero-crossing detection module 5 and a Hall sensor 6. The motor M is a rotating motor M, which drives the whipping device of the juicer through rotating power to whip the food materials in the juicer, the speed regulation module 3 is used for adjusting the rotating speed of the motor M, i.e. the whipping speed of the juicer, the Hall sensor 6 is arranged in the motor M and is used for sensing the rotating speed of the rotor of the motor M and sending the rotating speed information to the main control module 2, the main control module 2 adjusts the working state of the speed regulation module 3 according to the rotating speed information, changes the input power of the motor M, accurately controls the rotating speed of the motor M and adapts to the hardness and whipping requirements of different food materials.

[0037] Further, the drive module 4 is used for controlling the start and stop of the motor M, and the zero-crossing detection module 5 is used for detecting the zero-crossing point signal of the alternating current power supply AC to provide a timing reference for the trigger control of the speed regulation module 3. The whole circuit monitors the rotating speed of the motor M in real time through the Hall sensor 6 and realizes the intelligent whipping process of initial whipping, uniform judgment and full-power whipping in stages in combination with the logical judgment of the main control module 2.

[0038] AsFigure 1 As shown, the power input of the circuit is an alternating current power AC, which directly or through the power module 1 supplies power to other modules.

[0039] The power module 1 includes a power chip of model LN8K05 and its peripheral circuit, and the input end of the power module 1 is provided with a second RC filter and a voltage-dependent resistor TRV1 in parallel. In this embodiment, the second RC filter includes a second capacitor C2 connected in parallel to the ACL end and the ACN end of the alternating current power AC, a fourth resistor R4 and a sixth resistor R6 connected in parallel to the second capacitor C2, and a third resistor R3 connected in series to the ACL end, and the voltage-dependent resistor TRV1 is connected in parallel to the ACL end and the ACN end, for absorbing overvoltage or surge voltage, protecting the subsequent circuit from high voltage impact. The alternating current power AC enters the peripheral circuit of the chip LN8K05 after passing through the second RC filter and the voltage-dependent resistor TRV1, and outputs a direct current output voltage of 5V.

[0040] Further, as shown in Figure 1 The speed regulation module 3 includes a thyristor BTA and a third switch Q3, the first electrode and the second electrode of the thyristor BTA are connected to the alternating current power AC and the motor M respectively, the gate electrode G is connected to the alternating current power AC and grounded, the third switch Q3 is connected between the gate electrode G and the ground end, and the third switch Q3 receives a pulse width modulation signal (hereinafter referred to as PWM signal) output by the main control module 2, for controlling the conduction of the thyristor BTA.

[0041] Specifically, as shown in Figure 1As shown, the motor M has two ends of MOTO-L and MOTO-N, which are connected to the ACL end and the ACN end of the AC power supply AC respectively, the first electrode T1 of the thyristor BTA is connected to the ACN end of the AC power supply AC, the second electrode T2 is connected to the MOTO-N end of the motor M, the ACN end of the AC power supply AC is grounded, and the gate electrode G of the thyristor BTA is connected to the ground branch of the ACN end. The third switch Q3 is an NPN transistor, the base electrode of which is connected to the main control module 2 for receiving the PWM signal of the main control module 2, the collector electrode is connected to the gate electrode G of the thyristor BTA, and the emitter electrode is grounded. The thyristor BTA is a three-terminal bidirectional thyristor BTA, and the conduction of the third switch Q3 can form a forward or reverse current between the gate electrode G and the first electrode T1 of the thyristor BTA, thereby triggering the conduction of the thyristor BTA. In a preferred embodiment, the gate electrode G and the first electrode T1 of the thyristor BTA are connected to the eighth current-limiting resistor R8, and the gate electrode G and the base electrode of the third switch Q3 are connected in series with the eleventh resistor R11 and the twelfth resistor R12 which are connected in parallel with each other, so as to shunt and stabilize the triggering current. The base electrode and the emitter electrode of the third switch Q3 are connected to the eighteenth base resistor R18, and the base electrode is connected to the branch of the main control module 2, and the fifteenth current-limiting resistor R15 is connected to the branch. The first electrode T1 and the second electrode T2 of the thyristor BTA are connected in series with the first RC filter, which includes the ninth capacitor C9, the thirty-sixth resistor R36, the thirty-first resistor R31 and the thirty-second resistor R32 connected in series, so as to slow down the voltage change, optimize the signal characteristics, reduce the electromagnetic interference and improve the stability of the circuit.

[0042] In the above embodiment, the main control module 2 controls the speed regulation module 3 according to the rotation speed of the motor M detected by the Hall sensor 6 through the PWM signal. The PWM signal is input to the base electrode of the third switch Q3 through the fifteenth current-limiting resistor R15, so as to control the conduction and cutoff of the third switch Q3. When the third switch Q3 is conducted, the AC power supply AC forms a path with the ground, and a forward or reverse triggering current is formed between the gate electrode G and the first electrode T1, so as to make the thyristor BTA conducted. After the thyristor BTA is conducted, the power supply branch of the motor M is conducted, and the main control module 2 adjusts the conduction angle of the thyristor BTA by changing the duty ratio of the PWM signal, so as to change the input power of the motor M and realize the rotation speed regulation.

[0043] As shown in the figure, Figure 1 The driving module 4 includes the electromagnetic switch K1 and the fourth switch Q4. The electromagnetic switch K1 is connected between the motor M and the AC power supply AC. The electromagnetic switch K1 includes an electromagnetic coil. The power supply module 1, the electromagnetic coil and the fourth switch Q4 are connected in series to form a power supply circuit of the electromagnetic coil. The fourth switch Q4 is connected to the main control module 2, and is used to control the closing and opening of the electromagnetic switch K1.

[0044] Specifically, the fourth switch Q4 is an NPN transistor, the base of which is connected to the main control module 2, and the emitter of which is grounded; the power module 1 supplies power to the electromagnetic coil of the electromagnetic switch K1 and is connected to the collector of the fourth switch Q4. The base of the fourth switch Q4 is connected to the main control module 2 through the seventeenth current-limiting resistor R17, and the nineteenth base resistor R19 is arranged between the base and the emitter of the fourth switch Q4. When the main control module 2 outputs a high level, the signal is transmitted to the base of the fourth switch Q4 through the seventeenth current-limiting resistor R17, so that the fourth switch Q4 is turned on, the electromagnetic coil of the electromagnetic switch K1 is energized, the electromagnetic switch K1 is closed, and the motor M is turned on. The sixth diode D6 is arranged at both ends of the electromagnetic switch K1 and is directed to the input end of the power module 1, which is used to absorb the reverse high voltage generated when the electromagnetic switch K1 coil is de-energized, and to protect the fourth switch Q4 and other elements from being damaged.

[0045] As shown in Figure 1 The zero-crossing detection module 5 is used to collect the zero-crossing point signal of the alternating power supply AC and send the signal to the main control module 2 to provide a timing reference for the PWM signal generation of the speed regulation module 3. The zero-crossing detection module 5 includes a fifth diode D5 and a second NPN transistor Q2. The alternating power supply AC is connected to the base of the second NPN transistor Q2 through the fifth diode D5 and a voltage dividing network. The collector of the second NPN transistor Q2 is connected to the power module 1, and the emitter is grounded. The node between the collector of the second NPN transistor Q2 and the power module 1 is also connected to the main control module 2 for sending the collected zero-crossing point signal.

[0046] In a specific embodiment, the voltage dividing network includes a ninth voltage dividing resistor R9 and a thirteenth voltage dividing resistor R13 connected in series. The sixteenth base resistor R16 is connected between the base and the emitter of the second NPN transistor Q2. The eighth capacitor C8 is connected in parallel with the sixteenth base resistor R16. The tenth protection resistor R10 is connected between the collector of the second NPN transistor Q2 and the power module 1. The collector is connected to the main control module 2 through the fourteenth protection resistor R14.

[0047] In this embodiment, the fifth diode blocks the negative half cycle of the alternating signal and only allows the positive half cycle signal to enter the zero-crossing detection module 5. When the level exceeds the conduction voltage (0.7V) of the second NPN transistor Q2, the pin ZERO is equivalent to being shorted to the ground, and a low level is output. When the level is lower than the conduction voltage of the second NPN transistor Q2, the pin ZERO actually receives a 5V high level from the power module 1, and the pin ZERO is connected to the main control module 2, that is, the detection and collection of the zero-crossing signal are realized.

[0048] As shown in Figure 2As shown, the main control module 2 comprises a main control chip of model SC92F8362B-SOP20 and its peripheral circuit.

[0049] In the present scheme, the Hall sensor 6 is installed on the motor M (not shown in the figure) for sensing the rotating speed of the rotor of the motor M and outputting a rotating speed pulse signal to the main control module 2, which adjusts the rotating speed of the motor M through the speed regulation module 3.

[0050] In a specific embodiment, the electronic rotor is provided with an induction magnet (not shown in the figure), and when the induction magnet passes through the Hall sensor 6 every time the rotor rotates one circle, the circuit will induce a pulse signal to judge that the rotor rotates one circle. The following introduces an intelligent whipping function, when the juicer starts, the motor M runs at half power for 1.5 seconds, records the rotating speed pulse signal during the period, runs at half power again for 1.5 seconds, records the second rotating speed pulse signal, if the rotating speed is fast, it is judged that the food material is soft, if the rotating speed is slow, it is judged that the food material is hard, and a basic time is recorded for the second step of uniform judgment, the main control module 2 continues to receive the signal of the Hall sensor 6, according to the whipping speed per unit time during the uniform whipping period, a compensation time and a compensation correction time are recorded, and the third step of full-power whipping is carried out, the time is the sum of the basic time, the compensation time and the compensation correction time.

[0051] It should be understood that the above embodiments are intended to facilitate understanding of the technical effects of the present technical scheme, and the computer programs involved are applications of existing programs.

[0052] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be changed and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic whipping control circuit for a juice extractor, comprising a power supply module (1), a main control module (2) and a motor (M) for driving a whipping device, characterized in that: Also include The speed regulation module (3) is used for adjusting the rotating speed of the motor (M), and includes a thyristor (BTA) and a third switch element (Q3). The first electrode (T1) and the second electrode (T2) of the thyristor (BTA) are connected with the AC power supply (AC) and the motor (M) respectively, the gate electrode (G) is connected with the AC power supply (AC) and grounded, the third switch element (Q3) is connected between the gate electrode (G) and the ground terminal, the third switch element (Q3) receives the pulse width modulation signal output by the main control module (2) and is used for controlling the conduction of the thyristor (BTA); The driving module (4) includes an electromagnetic switch (K1) and a fourth switch element (Q4). The electromagnetic switch (K1) is connected between the motor (M) and the AC power supply (AC). The electromagnetic switch (K1) includes an electromagnetic coil. The power supply module (1), the electromagnetic coil and the fourth switch element (Q4) are connected in series to form a power supply circuit of the electromagnetic coil. The fourth switch element (Q4) is connected with the main control module (2) and is used for controlling the closing and opening of the electromagnetic switch (K1). The zero-crossing detection module (5) is used for detecting the zero-crossing point signal of the AC power supply (AC). The Hall sensor (6) is installed on the motor (M) and is used for sensing the rotating speed of the rotor of the motor (M) and outputting a rotating speed pulse signal to the main control module (2). The main control module (2) adjusts the rotating speed of the motor (M) through the speed regulation module (3).

2. An automatic whipping control circuit for a juicer as defined in claim 1, characterized in that: The zero-crossing detection module (5) includes a fifth diode (D5) and a second NPN transistor (Q2). The AC power supply (AC) is connected with the base electrode of the second NPN transistor (Q2) through the fifth diode (D5) and a voltage dividing network. The collector electrode of the second NPN transistor (Q2) is connected with the power supply module (1), and the emitter electrode is grounded. The node between the collector electrode of the second NPN transistor (Q2) and the power supply module is also connected with the main control module (2) and is used for sending the collected zero-crossing point signal.

3. An automatic whipping control circuit for a juicer as defined in claim 1, wherein: The first RC filter is arranged between the first electrode (T1) and the second electrode (T2).

4. An automatic whipping control circuit for a juicer as claimed in claim 3, wherein: The third switch element (Q3) is an NPN transistor. The base electrode of the third switch element (Q3) is connected with the main control module (2), the collector electrode is connected with the gate electrode (G) of the thyristor (BTA), and the emitter electrode is grounded.

5. An automatic whipping control circuit for a juicer as defined in claim 1, wherein: The positive terminal of the motor (M) is connected with the electromagnetic switch (K1), and the negative terminal is connected with the second electrode (T2) of the thyristor (BTA).

6. An automatic whipping control circuit for a juicer as defined in claim 1, wherein: The fourth switch element (Q4) is an NPN transistor. The base electrode of the fourth switch element (Q4) is connected with the main control module (2), and the emitter electrode is grounded. The power supply module (1) supplies power to the electromagnetic coil of the electromagnetic switch (K1) and is connected to the collector electrode of the fourth switch element (Q4).

7. An automatic whipping control circuit for a juicer as defined in claim 1, wherein: The power supply module (1) includes a power supply chip of type LN8K05 and peripheral circuits thereof.

8. An automatic whipping control circuit for a juicer as defined in claim 7, characterized in that: The second RC filter and the pressure sensitive resistor (TRV1) are arranged in parallel at the input end of the power supply module (1).

9. An automatic whipping control circuit for a juicer as defined in claim 1, wherein: The master module (2) comprises a master chip of model SC92F8362B-SOP20 and its peripheral circuit.

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