Coffee machine control circuit and control method for realizing automatic bean grinding control

Abstract

The invention discloses a coffee machine control circuit capable of realizing automatic bean grinding control and a control method, the coffee machine control circuit comprises a single-chip microcomputer, a grinder, a bean grinding motor and a stepping motor, and also comprises a zero point detection module and a motor driving module, and the zero point detection module and the motor driving module are both electrically connected with the stepping motor. Stepping motor control is added for grinder adjustment, the powder thickness of the grinder is automatically adjusted, the stepping motor control confirms the initial position through a zero point signal, the controller automatically adjusts the grinding gap according to user selection, and automatic control is achieved; by adjusting and controlling the grinder, control over ground coffee powder is achieved, a manual adjustment mode of a user is changed into an automatic adjustment mode, and operation is simpler; the rotating speed of the bean grinding motor is adjusted and controlled, control is more accurate, the uniformity degree and amount of powder are more accurate, and the flavor and taste of coffee are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of coffee machine bean grinding control, and in particular to a coffee machine control circuit and a control method for realizing automatic bean grinding control. Background Art

[0002] With consumers' love for coffee and the popularization of coffee culture, the demand for coffee machines is increasing. Consumers' demand for high-quality, convenient and fast coffee machines is increasing day by day. Various types of products have their own specific consumer groups, which has promoted the rapid development of the coffee machine market. In particular, fully automatic coffee machine products continue to occupy the mainstream of the market, further promoting the popularization of coffee machines and entering ordinary consumer households. The market size is showing a continuous upward trend.

[0003] The defects and deficiencies in the current coffee machine's bean grinding control scheme: During the coffee extraction process, the coarseness of the powder particles ground from the coffee beans directly affects the flavor of the coffee extraction. Coffee powders of different coarsenesses require different extraction times to achieve the best flavor and taste. However, most coffee machines currently have no control over the grinding coarseness in the bean grinding unit of the grinder, and mainly rely on manually rotating the grinder to adjust the coarseness of the coffee ground powder. This requires the coffee machine user to fully understand the variety of coffee beans and the degree of roasting, and then manually adjust the grinder to determine the coarseness of the powder, and then set the coffee extraction time to complete the coffee extraction. In this process, novices need to try and explore before they can achieve the corresponding more perfect flavor of coffee, which is inconvenient to use and also places higher demands on users.

[0004] like Figure 2 ; The existing coffee machine's grinding unit is implemented in the following way: the grinding coarseness is adjusted by manually rotating the grinder. The grinding motor is controlled by a relay, and the speed control is single. Since the grinding coarseness is manually set and the grinding motor is uncontrollable, the coffee powder filling the extraction device is determined by setting the grinding time. The grinding time needs to be manually adjusted for different coarsenesses, and it is easy to have insufficient or excessive coffee powder during operation. Summary of the invention

[0005] The object of the present invention is to provide a coffee machine control circuit and control method for realizing automatic bean grinding control, so as to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a coffee machine control circuit for realizing automatic bean grinding control, comprising a single-chip microcomputer, a grinder, a bean grinding motor and a stepper motor, and also comprising a zero point detection module and a motor drive module, wherein the zero point detection module and the motor drive module are both electrically connected to the stepper motor.

[0007] Preferably, it also includes:

[0008] Fuse F1, which is connected between the bean grinder motor and the rectifier bridge BD1;

[0009] A rectifier bridge BD1, wherein the rectifier bridge BD1 converts AC power into DC power;

[0010] A resistor R1, wherein the resistor R1 is connected between the rectifier bridge BD1 and the capacitor C1;

[0011] Capacitor C1 is used to filter out ripples in the rectified DC power and smooth the DC voltage;

[0012] A bidirectional thyristor TR1, wherein the bidirectional thyristor TR1 is used for switching and regulating in an AC circuit;

[0013] A resistor R4, wherein the resistor R4 is connected between the capacitor C1 and the optical coupler U1;

[0014] Inductor L1, the inductor L1 is used to suppress current mutation and protect the circuit;

[0015] A resistor R2, wherein the resistor R2 is connected to the optical coupler U1;

[0016] An optical coupler U1, wherein the optical coupler U1 is used to isolate an input signal from an output signal;

[0017] A resistor R3, wherein the resistor R3 is connected between the input end of the optical coupler U1 and a +3.3V power supply;

[0018] A resistor R5, wherein the resistor R5 is connected between the output end of the optical coupler U1 and the ground;

[0019] Relay NR1, the relay NR1 is connected between the output end of the optical coupler U1 and the ground, and is used to control the drive of the bean grinding motor.

[0020] A coffee machine control method for realizing automatic bean grinding control, using the coffee machine control circuit for realizing automatic bean grinding control, comprises the following steps:

[0021] S1, automatically adjust the powder coarseness of the grinder through the stepper motor;

[0022] S2, the bean grinding motor is controlled by a thyristor, which realizes the speed adjustment of the bean grinding motor and the automatic control is carried out in conjunction with the gap adjustment of the grinder;

[0023] S3, automatically matching the speed control of the stepper motor and the bean grinding motor is achieved through the single chip microcomputer.

[0024] Preferably, the stepper motor control in S1 uses a zero point signal to confirm the initial position, and the controller automatically adjusts the grinding gap according to the user's selection to achieve automatic control.

[0025] Preferably, the stepper motor is provided with current detection control, and the bean grinding motor is provided with current detection control.

[0026] Preferably, the bean grinding motor adopts speed regulation control and current detection control of a DC brushless control scheme.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The grinder is adjusted to control the coffee ground powder. The user switches from manual adjustment to automatic adjustment, making the operation easier.

[0029] 2. The speed adjustment and control of the grinding motor is realized, which makes the control more precise, and the uniformity and quantity of the powder are more accurate, ensuring the flavor and taste of the coffee. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 is a circuit diagram of the present invention;

[0032] Figure 2 It is a circuit diagram of the prior art. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0034] See also Figure 1 In an embodiment of the present invention, a coffee machine control circuit for realizing automatic bean grinding control includes a single chip microcomputer, a grinder, a bean grinding motor and a stepper motor, and also includes a zero point detection module and a motor drive module, and the zero point detection module and the motor drive module are both electrically connected to the stepper motor.

[0035] Preferably, it also includes:

[0036] Fuse F1, which is connected between the bean grinder motor and the rectifier bridge BD1;

[0037] A rectifier bridge BD1, wherein the rectifier bridge BD1 converts AC power into DC power;

[0038] A resistor R1, wherein the resistor R1 is connected between the rectifier bridge BD1 and the capacitor C1;

[0039] Capacitor C1 is used to filter out ripples in the rectified DC power and smooth the DC voltage;

[0040] A bidirectional thyristor TR1, wherein the bidirectional thyristor TR1 is used for switching and regulating in an AC circuit;

[0041] A resistor R4, wherein the resistor R4 is connected between the capacitor C1 and the optical coupler U1;

[0042] Inductor L1, the inductor L1 is used to suppress current mutation and protect the circuit;

[0043] A resistor R2, wherein the resistor R2 is connected to the optical coupler U1;

[0044] An optical coupler U1, wherein the optical coupler U1 is used to isolate an input signal from an output signal;

[0045] A resistor R3, wherein the resistor R3 is connected between the input end of the optical coupler U1 and a +3.3V power supply;

[0046] A resistor R5, wherein the resistor R5 is connected between the output end of the optical coupler U1 and the ground;

[0047] Relay NR1, the relay NR1 is connected between the output end of the optical coupler U1 and the ground, and is used to control the drive of the bean grinding motor.

[0048] When the input signal (labeled "grinding motor drive") is at a high level, the optocoupler U1 is turned on, making the bidirectional thyristor TR1 turned on, thereby driving the grinding motor to work. When the input signal is at a low level, the optocoupler U1 is turned off, the bidirectional thyristor TR1 is turned off, and the grinding motor stops working.

[0049] A coffee machine control method for realizing automatic bean grinding control, using the coffee machine control circuit for realizing automatic bean grinding control, comprises the following steps:

[0050] S1. Automatically adjust the powder coarseness of the grinder through the stepper motor; the stepper motor control uses the zero point signal to confirm the initial position, and the controller automatically adjusts the grinding gap according to the user's selection to achieve automatic control;

[0051] S2, the bean grinding motor is controlled by a thyristor, which realizes the speed adjustment of the bean grinding motor and the automatic control is carried out in conjunction with the gap adjustment of the grinder;

[0052] S3, automatically matching the speed control of the stepper motor and the bean grinding motor is achieved through the single chip microcomputer.

[0053] The stepper motor is provided with current detection control, the bean grinder motor is provided with current detection control, and the bean grinder motor adopts speed regulation control and current detection control of a brushless DC control scheme.

[0054] The working principle of the present invention is as follows: the grinder adjustment adds stepper motor control to automatically adjust the powder coarseness of the grinder; the stepper motor control uses a zero point signal to confirm the initial position; the controller automatically adjusts the grinding gap according to the user's selection to achieve automatic control; the bean grinding motor is changed from relay control to thyristor control, which realizes the speed adjustment of the bean grinding motor and automatically controls the gap adjustment of the grinder; the program is used to automatically achieve the automatic matching of the speed control of the stepper motor and the bean grinding motor, which simplifies the user operation.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coffee machine control circuit for realizing automatic bean grinding control, characterized in that: The invention comprises a single chip microcomputer, a grinder, a bean grinding motor and a stepping motor, and also comprises a zero point detection module and a motor driving module. Both the zero point detection module and the motor driving module are electrically connected to the stepping motor.

2. A coffee machine control circuit for realizing automatic bean grinding control according to claim 1, characterized in that: Also includes: Fuse F1, which is connected between the bean grinder motor and the rectifier bridge BD1; A rectifier bridge BD1, wherein the rectifier bridge BD1 converts AC power into DC power; A resistor R1, wherein the resistor R1 is connected between the rectifier bridge BD1 and the capacitor C1; Capacitor C1 is used to filter out ripples in the rectified DC power and smooth the DC voltage; A bidirectional thyristor TR1, wherein the bidirectional thyristor TR1 is used for switching and regulating in an AC circuit; A resistor R4, wherein the resistor R4 is connected between the capacitor C1 and the optical coupler U1; Inductor L1, the inductor L1 is used to suppress current mutation and protect the circuit; A resistor R2, wherein the resistor R2 is connected to the optical coupler U1; An optical coupler U1, wherein the optical coupler U1 is used to isolate an input signal from an output signal; A resistor R3, wherein the resistor R3 is connected between the input end of the optical coupler U1 and a +3.3V power supply; A resistor R5, wherein the resistor R5 is connected between the output end of the optical coupler U1 and the ground; Relay NR1, the relay NR1 is connected between the output end of the optical coupler U1 and the ground, and is used to control the drive of the bean grinding motor.

3. A coffee machine control method for realizing automatic bean grinding control, characterized in that: A coffee machine control circuit for realizing automatic bean grinding control according to claim 1 or 2 is used, comprising the following steps: S1, automatically adjust the powder coarseness of the grinder through the stepper motor; S2, the bean grinding motor is controlled by a thyristor, which realizes the speed adjustment of the bean grinding motor and the automatic control is carried out in conjunction with the gap adjustment of the grinder; S3, automatically matching the speed control of the stepper motor and the bean grinding motor is achieved through the single chip microcomputer.

4. The coffee machine control method for realizing automatic bean grinding control according to claim 3, characterized in that: The stepper motor control in S1 uses a zero point signal to confirm the initial position, and the controller automatically adjusts the grinding gap according to the user's selection to achieve automatic control.

5. The coffee machine control method for realizing automatic bean grinding control according to claim 3, characterized in that: The stepper motor adds current detection control, and the bean grinding motor adds current detection control.

6. The coffee machine control method for realizing automatic bean grinding control according to claim 5, characterized in that: The bean grinding motor adopts speed regulation control and current detection control of a DC brushless control solution.

Images