Bean grinding motor control circuit and control method for powder falling of coffee machine

Abstract

The invention discloses a coffee machine powder falling bean grinding motor control circuit and a control method, the coffee machine powder falling bean grinding motor control circuit comprises a grinder, a bean grinding motor, a steering control circuit of the bean grinding motor and a rotating speed adjusting control circuit of the bean grinding motor, and the steering control circuit of the bean grinding motor and the rotating speed adjusting control circuit of the bean grinding motor are both electrically connected with the bean grinding motor. According to the invention, the steering control and the rotating speed regulation control of the bean grinding motor are added, so that automatic control is realized for optimizing a powder falling mode after coffee powder is ground, the powder falling effect is improved, and the overall cost is reduced; the bean grinding motor is additionally provided with steering control, grinding forward rotation and powder falling reverse rotation; control of the bean grinding motor is changed into control in a silicon controlled mode, so that the rotating speed of the bean grinding motor is automatically adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of coffee machine powder dropping control, and in particular to a coffee machine powder dropping grinding motor control circuit and control method. 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 control scheme for grinding beans and powder falling: Before coffee is extracted, the coffee beans need to be ground into powder particles of specific requirements. At present, the coffee powder falling method used by most coffee machines relies on gravity to naturally fall or mechanical structure to allow coffee powder to enter the coffee machine brewing handle through the powder falling channel during the grinding process. This brings a direct impact. During use, coffee powder often accumulates in the powder falling channel, which easily causes blockage and poor powder falling. The difficulty in cleaning and bacterial growth caused by the long-term accumulation of coffee powder affects the flavor and taste of coffee extraction.

[0004] like Figure 2 The existing coffee machine's grinding and powder dropping unit is implemented in a natural powder dropping mode without control. There is a way to improve the powder dropping by adding a vibration motor, but the overall cost increases. The grinding motor is controlled by a relay, and the speed control is single, and only forward rotation is performed to grind and feed. To this end, we propose a coffee machine grinding motor control circuit and control method. Summary of the invention

[0005] The object of the present invention is to provide a coffee bean grinding motor control circuit and control method for coffee machine powder dropping, 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 bean grinding motor control circuit for coffee machine powder dropping, comprising a grinder, a bean grinding motor, a steering control circuit of the bean grinding motor and a speed adjustment control circuit of the bean grinding motor, wherein the steering control circuit of the bean grinding motor and the speed adjustment control circuit of the bean grinding motor are both electrically connected to the bean grinding motor.

[0007] Preferably, the steering control circuit of the bean grinding motor includes:

[0008] Relay K1, relay K1 is connected to the corresponding switch;

[0009] Diode D1, diode D1 is connected across the coil of relay K1;

[0010] Load PR1, one side of load PR1 is connected to the contact of relay K1, and the other side of load PR1 is connected to the +12V power supply;

[0011] Relay K2, relay K2 is connected to the corresponding switch;

[0012] Diode D2, diode D2 is connected across the coil of relay K2;

[0013] Load PR2, one side of load PR2 is connected to the contact of relay K2, and the other side of load PR2 is connected to the +12V power supply.

[0014] Preferably, the speed regulation control circuit of the bean grinding motor includes:

[0015] A rectifier bridge BD1, wherein the rectifier bridge BD1 converts AC power into DC power;

[0016] A resistor R1, wherein the resistor R1 is connected between the rectifier bridge BD1 and the capacitor C1;

[0017] Capacitor C1 is used to filter out ripples in the rectified DC power and smooth the DC voltage;

[0018] A bidirectional thyristor TR1, wherein the bidirectional thyristor TR1 is used for switching and regulating in an AC circuit;

[0019] A resistor R4, wherein the resistor R4 is connected between the capacitor C1 and the optical coupler U1;

[0020] Inductor L1, the inductor L1 is used to suppress current mutation and protect the circuit;

[0021] A resistor R2, wherein the resistor R2 is connected to the optical coupler U1;

[0022] An optical coupler U1, wherein the optical coupler U1 is used to isolate an input signal from an output signal;

[0023] A resistor R3, wherein the resistor R3 is connected between the input end of the optical coupler U1 and a +3.3V power supply;

[0024] A resistor R5, wherein the resistor R5 is connected between the output end of the optical coupler U1 and the ground;

[0025] 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.

[0026] Preferably, the speed regulation control circuit of the bean grinding motor further includes a fuse F1, and the fuse F1 is connected between the bean grinding motor and the rectifier bridge BD1.

[0027] A method for controlling a coffee bean grinding motor for coffee machine powder dropping is provided, using the coffee bean grinding motor control circuit for coffee machine powder dropping, and comprising the following steps:

[0028] S1, the bean grinding motor is controlled by a bidirectional relay. When relay K1 and relay K2 are turned on, the bean grinding motor runs forward and enters the grinding state; when relay K1 and relay K2 are turned off, the bean grinding motor runs reversely and enters the powder dropping state.

[0029] S2. Use the single-chip microcomputer to adjust the bidirectional thyristor TR1 to adjust the speed of the grinding motor. Use the forward and reverse alternating control method to achieve the alternating process conversion of forward grinding and reverse powder falling, and make strong and weak alternating changes in the speed control of the grinding motor.

[0030] Preferably, the bean grinder motor is provided with a current detection control for detecting stalling of the bean grinder motor and making corresponding speed reduction and protective shutdown functions.

[0031] Preferably, the bean grinding motor adopts brushless DC control to achieve speed regulation control and steering control.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. Adding steering control and speed adjustment control of the grinding motor can optimize the powder falling mode after the coffee powder is ground to achieve automatic control, improve the powder falling effect and reduce the overall cost.

[0034] 2. Add steering control to the bean grinding motor, with forward rotation for grinding and reverse rotation for powder dropping. Change the control of the bean grinding motor to thyristor control to achieve automatic adjustment of the grinding motor speed. Use the program control of the single-chip microcomputer and the forward and reverse alternating control method to achieve the alternating process conversion of forward grinding and reverse powder dropping. Make alternating changes in the speed control of the bean grinding motor to simulate the shaking effect of powder dropping, improve the effect of powder dropping, reduce the residual coffee powder and the number of manual cleaning times; automatic grinding and powder dropping control can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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:

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 It is a structural schematic diagram of the prior art. DETAILED DESCRIPTION

[0038] 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.

[0039] See also Figure 1 In an embodiment of the present invention, a bean grinding motor control circuit and a control method for coffee machine powder dropping include a grinder, a bean grinding motor, a steering control circuit of the bean grinding motor and a speed regulating control circuit of the bean grinding motor, wherein the steering control circuit of the bean grinding motor and the speed regulating control circuit of the bean grinding motor are both electrically connected to the bean grinding motor.

[0040] Preferably, the steering control circuit of the bean grinding motor includes:

[0041] Relay K1, relay K1 is connected to the corresponding switch;

[0042] Diode D1, diode D1 is connected across the coil of relay K1;

[0043] Load PR1, one side of load PR1 is connected to the contact of relay K1, and the other side of load PR1 is connected to the +12V power supply;

[0044] Relay K2, relay K2 is connected to the corresponding switch;

[0045] Diode D2, diode D2 is connected across the coil of relay K2;

[0046] Load PR2, one side of load PR2 is connected to the contact of relay K2, and the other side of load PR2 is connected to the +12V power supply.

[0047] Preferably, the speed regulation control circuit of the bean grinding motor includes:

[0048] A rectifier bridge BD1, wherein the rectifier bridge BD1 converts AC power into DC power;

[0049] A resistor R1, wherein the resistor R1 is connected between the rectifier bridge BD1 and the capacitor C1;

[0050] Capacitor C1 is used to filter out ripples in the rectified DC power and smooth the DC voltage;

[0051] A bidirectional thyristor TR1, wherein the bidirectional thyristor TR1 is used for switching and regulating in an AC circuit;

[0052] A resistor R4, wherein the resistor R4 is connected between the capacitor C1 and the optical coupler U1;

[0053] Inductor L1, the inductor L1 is used to suppress current mutation and protect the circuit;

[0054] A resistor R2, wherein the resistor R2 is connected to the optical coupler U1;

[0055] An optical coupler U1, wherein the optical coupler U1 is used to isolate an input signal from an output signal;

[0056] A resistor R3, wherein the resistor R3 is connected between the input end of the optical coupler U1 and a +3.3V power supply;

[0057] A resistor R5, wherein the resistor R5 is connected between the output end of the optical coupler U1 and the ground;

[0058] 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.

[0059] Preferably, the speed regulation control circuit of the bean grinding motor further includes a fuse F1, and the fuse F1 is connected between the bean grinding motor and the rectifier bridge BD1.

[0060] A method for controlling a coffee bean grinding motor for coffee machine powder dropping is provided, using the coffee bean grinding motor control circuit for coffee machine powder dropping, and comprising the following steps:

[0061] S1, the bean grinding motor is controlled by a bidirectional relay. When relay K1 and relay K2 are turned on, the bean grinding motor runs forward and enters the grinding state; when relay K1 and relay K2 are turned off, the bean grinding motor runs reversely and enters the powder dropping state.

[0062] S2. Use the single-chip microcomputer to adjust the bidirectional thyristor TR1 to adjust the speed of the grinding motor. Use the forward and reverse alternating control method to achieve the alternating process conversion of forward grinding and reverse powder falling, and make strong and weak alternating changes in the speed control of the grinding motor.

[0063] Preferably, the bean grinder motor is provided with a current detection control for detecting stalling of the bean grinder motor and making corresponding speed reduction and protective shutdown functions.

[0064] Preferably, the bean grinding motor adopts brushless DC control to achieve speed regulation control and steering control.

[0065] The working principle of the present invention is as follows: the bean grinding motor is controlled by a one-way relay and is changed to a two-way relay control, so as to realize the commutation control of the bean grinding motor. When relays K1 and K2 are turned on, the bean grinding motor is in the forward direction and enters the grinding state; when relays K1 and K2 are turned off, the bean grinding motor is in the reverse direction and enters the powder dropping state. The bean grinding motor is added with thyristor control to realize the speed regulation control of the bean grinding motor. The speed of the bean grinding motor is adjusted by adjusting the thyristor TR1 by using a single-chip microcomputer, and the alternating process conversion of forward grinding and reverse powder dropping is realized by using the forward and reverse alternating control method, and the strong and weak alternating changes are made in the speed control of the bean grinding motor to simulate the shaking effect of powder dropping, improve the effect of powder dropping, and reduce the residual coffee powder and the number of manual cleaning times. Automatic grinding and powder dropping control can be realized, which simplifies user operation.

[0066] 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 bean grinding motor control circuit for coffee machine powder dropping, characterized in that: The invention comprises a grinder, a bean grinding motor, a steering control circuit of the bean grinding motor and a speed regulating control circuit of the bean grinding motor, wherein the steering control circuit of the bean grinding motor and the speed regulating control circuit of the bean grinding motor are both electrically connected to the bean grinding motor.

2. A coffee bean grinding motor control circuit for coffee machine powder dropping according to claim 1, characterized in that: The steering control circuit of the bean grinding motor includes: Relay K1, relay K1 is connected to the corresponding switch; Diode D1, diode D1 is connected across the coil of relay K1; Load PR1, one side of load PR1 is connected to the contact of relay K1, and the other side of load PR1 is connected to the +12V power supply; Relay K2, relay K2 is connected to the corresponding switch; Diode D2, diode D2 is connected across the coil of relay K2; Load PR2, one side of load PR2 is connected to the contact of relay K2, and the other side of load PR2 is connected to the +12V power supply.

3. The coffee bean grinding motor control circuit for coffee machine powder dropping according to claim 1, characterized in that: The speed regulation control circuit of the bean grinding motor includes: 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.

4. A coffee bean grinding motor control circuit for coffee machine powder dropping according to claim 3, characterized in that: The speed regulation control circuit of the bean grinding motor further includes a fuse F1, which is connected between the bean grinding motor and the rectifier bridge BD1.

5. A method for controlling a coffee bean grinding motor for coffee machine powder dropping, characterized in that: A coffee bean grinding motor control circuit for coffee machine powder dropping according to any one of claims 1 to 4 is used, comprising the following steps: S1, the bean grinder motor is controlled by a bidirectional relay. When relay K1 and relay K2 are turned on, the bean grinder motor runs forward and enters the grinding state; when relay K1 and relay K2 are turned off, the bean grinder motor runs reversely and enters the powder dropping state. S2. Use the single-chip computer to adjust the bidirectional thyristor TR1 to adjust the speed of the grinding motor. Use the forward and reverse alternating control method to achieve the alternating process conversion of forward grinding and reverse powder falling, and make strong and weak alternating changes in the speed control of the grinding motor.

6. A coffee bean grinding motor control circuit and control method for coffee machine powder dropping according to claim 5, characterized in that: The bean grinder motor is provided with a current detection control for detecting stalling of the bean grinder motor and making corresponding speed reduction and protection shutdown functions.

7. A coffee bean grinding motor control circuit and control method for coffee machine powder dropping according to claim 5, characterized in that: The bean grinding motor adopts brushless DC control to achieve speed regulation control and steering control.

Images