Control circuit of beverage machine and beverage machine

Abstract

The utility model provides a control circuit of a beverage machine and the beverage machine, and is applied to the technical field of beverage machines, the control circuit comprises a voltage regulating circuit, a power conversion circuit, a voltage detection circuit and a controller, the voltage detection circuit is connected with the output end of the power conversion circuit, and the controller is connected with the power conversion circuit. And when the power conversion circuit supplies a sampling voltage corresponding to the current driving voltage of the driving motor to the controller, the controller transmits a control signal for controlling the voltage regulation circuit to the voltage regulation circuit so as to regulate the driving voltage supplied to the driving motor by the power conversion circuit. Through the control circuit provided by the invention, the driving voltage provided by the power conversion circuit to the driving motor can be adjusted by combining the sampling voltage in the actual operation process, and then the driving motor is controlled to provide different locked-rotor torques, so that the beverage machine can provide beverages with different tastes, the functions of the beverage machine are enriched, and the use experience of a user is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of beverage machines, and in particular to a control circuit of a beverage machine and a beverage machine. Background Art

[0002] Drive motors, also known as electric motors or motors, are widely used in various beverage machines, such as coffee machines, juicers, and soy milk machines, due to their excellent electrical-to-mechanical energy conversion efficiency.

[0003] For example, a coffee machine includes a brewing device. A drive motor drives a piston in the brewing device to compact the coffee powder into a coffee cake for brewing. In the prior art, the drive motor in the coffee machine is connected to a transformer and equipped with a control circuit for starting and stopping the transformer. When the control circuit powers on the transformer, the transformer supplies power to the drive motor, causing the drive motor to begin operating. Conversely, when the control circuit powers off the transformer, the transformer no longer supplies power to the drive motor, causing it to cease operating.

[0004] The inventors have found that the driving voltage of the driving motor is related to its stall torque, and adjusting the stall torque of the driving motor can adjust the powder pressing force of the brewing device, thereby adjusting the taste of beverages such as coffee. However, the existing technology can only control the start or stop of the driving motor through a transformer. The control method is single and cannot provide different stall torques, and thus cannot provide beverages with different tastes, resulting in a single function of the beverage machine and a poor user experience. Utility Model Content

[0005] In view of this, the present application is dedicated to providing a control circuit and a beverage machine to solve the problem that the driving motor control method is single, resulting in single function of the beverage machine and poor user experience.

[0006] In a first aspect, the present application provides a control circuit for a beverage machine, comprising: a voltage regulating circuit, a power conversion circuit, a voltage detection circuit, and a controller, wherein:

[0007] The input end of the voltage regulating circuit is connected to the first power supply, and the output end of the voltage regulating circuit is connected to the input end of the power conversion circuit;

[0008] The output end of the power conversion circuit is connected to the driving motor of the beverage machine and the sampling end of the voltage detection circuit respectively;

[0009] The feedback end of the voltage detection circuit is connected to the controller, and the voltage detection circuit provides the controller with a sampling voltage corresponding to the current driving voltage of the driving motor;

[0010] The controller is connected to the control end of the voltage regulating circuit. The controller transmits a control signal to the voltage regulating circuit to adjust the driving voltage provided by the power conversion circuit to the driving motor. The control signal is generated based on the sampled voltage.

[0011] In an optional embodiment, the voltage regulating circuit includes: a driving circuit and a chopper circuit, wherein:

[0012] The input end of the chopper circuit serves as the input end of the voltage regulating circuit, and the output end of the chopper circuit serves as the output end of the voltage regulating circuit;

[0013] The control end of the driving circuit serves as the control end of the voltage regulating circuit, and the driving end of the driving circuit is connected to the control end of the chopper circuit;

[0014] The drive circuit switches the conduction state of the chopper circuit in response to the control signal of the controller.

[0015] In an optional embodiment, the driving circuit includes: a first photocoupler, a first protection resistor, a second protection resistor, and a third protection resistor; the chopping circuit includes: a bidirectional thyristor, wherein:

[0016] The first input end of the first photoelectric coupler is connected to the second power supply, and the second input end of the first photoelectric coupler is connected to one end of the first protection resistor;

[0017] The other end of the first protection resistor serves as the control end of the driving circuit;

[0018] One end of the second protection resistor is connected to the first end of the bidirectional thyristor, and the other end of the second protection resistor is connected to the first output end of the first photocoupler;

[0019] One end of the third protection resistor is connected to the second end of the bidirectional thyristor, and the other end of the third protection resistor is connected to the second output end of the first photocoupler;

[0020] A connection point between the second output terminal of the first photocoupler and the third protection resistor serves as a driving terminal of the driving circuit and is connected to a control terminal of the bidirectional thyristor.

[0021] In an optional embodiment, the voltage regulating circuit further includes: a first protection circuit, wherein:

[0022] The first protection circuit is connected between the first terminal and the second terminal of the bidirectional thyristor;

[0023] The first end of the bidirectional thyristor is connected to the first power supply, and the first protection circuit is used to clamp the voltage between the first end and the second end of the bidirectional thyristor to a first safety voltage when the voltage of the first power supply is greater than a first voltage threshold.

[0024] In an optional embodiment, the voltage detection circuit includes: a voltage divider circuit, wherein:

[0025] The voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor, wherein:

[0026] One end of the first voltage-dividing resistor serves as a sampling end of the voltage detection circuit and is connected to the output end of the power conversion circuit; the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor; and the other end of the second voltage-dividing resistor is grounded;

[0027] The connection point between the first voltage-dividing resistor and the second voltage-dividing resistor serves as a feedback terminal of the voltage detection circuit and is connected to the controller;

[0028] The control signal is generated based on a magnitude relationship between a current driving voltage of the driving motor and a target voltage. The current driving voltage of the driving motor is determined according to a voltage dividing ratio of the voltage dividing circuit and the sampled voltage.

[0029] In an optional embodiment, the power conversion circuit includes a transformer and a rectifier circuit, wherein:

[0030] The primary side of the transformer serves as the input end of the power conversion circuit and is connected to the output end of the voltage regulating circuit, and the secondary side of the transformer is connected to the input end of the rectifier circuit;

[0031] The output end of the rectifier circuit serves as the output end of the power conversion circuit and is connected to the driving motor and the sampling end of the voltage detection circuit respectively.

[0032] In an optional embodiment, the control circuit provided in the first aspect of the present application further includes: a state detection circuit, wherein a feedback end of the state detection circuit is connected to the controller, wherein:

[0033] The state detection circuit outputs a detection signal to the controller, wherein the detection signal is output when the drive motor is stalled;

[0034] When the controller receives the detection signal, the controller outputs the control signal to the voltage regulating circuit, or,

[0035] After receiving the detection signal, the controller counts the duration of the stall of the drive motor, and when the duration reaches a preset duration threshold, the controller outputs the control signal to the voltage regulating circuit.

[0036] In an optional embodiment, the state detection circuit includes: a current limiting resistor, a pull-up resistor, and a photointerrupter, and the photointerrupter includes a light-emitting component and a light-receiving component, wherein:

[0037] One end of the current limiting resistor is connected to the second power supply, and the other end of the current limiting resistor is connected to the input end of the light-emitting component;

[0038] The output end of the light emitting component is grounded;

[0039] One end of the pull-up resistor is connected to the second power supply, and the other end of the pull-up resistor is connected to the input end of the light receiving component;

[0040] The output end of the light receiving component is grounded;

[0041] The connection point between the light receiving component and the pull-up resistor serves as a feedback end of the state detection circuit and is connected to the controller.

[0042] In an optional embodiment, the first power source includes an AC power source;

[0043] The control circuit further includes: a zero-crossing detection circuit, wherein:

[0044] The detection end of the zero-crossing detection circuit is connected to the first power supply, and the feedback end of the zero-crossing detection circuit is connected to the controller;

[0045] The zero-crossing detection circuit detects a change in the amplitude of the output voltage of the first power supply and outputs an enable signal to the controller when the amplitude of the output voltage crosses a zero value;

[0046] The control signal is generated according to the sampling voltage and the enable signal.

[0047] In an optional implementation, the zero-crossing detection circuit includes: a second photocoupler and a first detection resistor, wherein:

[0048] The input end of the second photoelectric coupler serves as the detection end of the zero-crossing detection circuit and is connected to the first power supply. The first output end of the second photoelectric coupler is connected to one end of the first detection resistor. The second output end of the second photoelectric coupler is grounded.

[0049] The other end of the first detection resistor is connected to a second power supply;

[0050] The connection point between the second photoelectric coupler and the first detection resistor serves as a feedback end of the zero-crossing detection circuit and is connected to the controller.

[0051] In an optional embodiment, the control circuit provided in the first aspect of the present application further includes: a motor control circuit, wherein:

[0052] The motor control circuit is connected between the power conversion circuit and the drive motor;

[0053] The controller is connected to the control end of the motor control circuit, and the controller controls the operating state of the drive motor through the motor control circuit.

[0054] In a second aspect, the present application provides a beverage machine, comprising: a drive motor, a brewing device, and a control circuit of the beverage machine as described in any one of the first aspects of the present application, wherein the drive motor is drivingly connected to the brewing device.

[0055] Based on the above content, the control circuit applied to the beverage machine provided in the present application includes a voltage regulating circuit, a power conversion circuit, a voltage detection circuit and a controller. The voltage detection circuit is connected to the output end of the power conversion circuit, and provides the controller with a sampling voltage corresponding to the current driving voltage of the drive motor. The controller transmits a control signal of the voltage regulating circuit to the voltage regulating circuit to adjust the driving voltage provided by the power conversion circuit to the drive motor. It can be seen that the control circuit provided by the present application can adjust the driving voltage provided by the power conversion circuit to the drive motor in combination with the sampling voltage during actual operation, and then control the drive motor to provide different stall torques, so that the beverage machine can provide beverages with different tastes, enrich the functions of the beverage machine, and effectively improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0057] Figure 1 This is a structural block diagram of a control circuit provided by this application.

[0058] Figure 2 This is a topological diagram of a voltage regulating circuit provided in this application.

[0059] Figure 3 This is a topological diagram of another voltage regulating circuit provided in this application.

[0060] Figure 4This is a topological diagram of a power conversion circuit provided by this application.

[0061] Figure 5 This is a topological diagram of a voltage detection circuit provided by this application.

[0062] Figure 6 This is a structural block diagram of another control circuit provided by this application.

[0063] Figure 7 This is a topological diagram of a state detection circuit provided by this application.

[0064] Figure 8 This is a topological diagram of a zero-crossing detection circuit provided by this application.

[0065] Figure 9 This is a topological diagram of another zero-crossing detection circuit provided by this application.

[0066] Figure 10 This is a schematic diagram of the effect of using a zero-crossing detection circuit to detect the zero-crossing point of the AC voltage.

[0067] Figure 11 This is a structural block diagram of another control circuit provided by this application. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0069] As previously mentioned, drive motors are used in a variety of beverage machines, such as coffee machines, juicers, and soymilk makers. Taking a coffee machine as an example, a drive motor drives the piston of the brewing mechanism within the coffee machine to perform a powder compacting operation, thereby compacting the coffee powder into a coffee cake for brewing coffee. The coffee cake is then subjected to high-pressure extraction within the brewing mechanism to form a beverage. In the prior art, the drive motor within the coffee machine is connected to a transformer, and the operating state of the transformer is controlled by a control circuit. When the control circuit powers on the transformer, the transformer supplies power to the drive motor, and the drive motor begins to operate. Conversely, when the control circuit powers off the transformer, the transformer no longer supplies power to the drive motor, and the drive motor stops operating.

[0070] In actual applications, the compacting force of the brewing device's piston affects the density of the coffee powder cake, and thus affects the extraction pressure of high-pressure extraction. If the extraction pressure is low, the coffee oil is thin and the taste is light. If the extraction pressure is high, the coffee oil is thick and has a burnt and bitter taste. In other words, the compacting force can directly change the final taste of the coffee, and the compacting force of the brewing device is directly corresponding to the stall torque of the drive motor.

[0071] It is understandable that if the pressing force of the brewing device piston is large, the density of the pressed coffee powder cake will be large, and if the pressing force of the brewing device piston is small, the density of the pressed coffee powder cake will be small.

[0072] Through research on the existing technology, the inventor found that the driving voltage of the driving motor is related to its stall torque. Therefore, by adjusting the driving voltage of the driving motor, the powder pressing force of the brewing device can be adjusted, and then the taste of beverages such as coffee can be adjusted. However, the existing technology can only control the start or stop of the driving motor through a transformer. The control method is single, and the driving voltage of the driving motor cannot be adjusted. It is also impossible to control the driving motor to provide different stall torques, and thus it is impossible to adjust the powder pressing force of the brewing device, and it is impossible to provide beverages with different tastes. This results in a single function of the beverage machine and a poor user experience, especially when the driving motor is a brushed motor.

[0073] In order to solve the above problems, the present application provides a control circuit, which is applied to a beverage machine. The control circuit provided by the present application includes a voltage regulating circuit, a power conversion circuit, a voltage detection circuit and a controller. The voltage detection circuit provides a sampling voltage of the output end of the power conversion circuit to the controller. The controller controls the voltage regulating circuit according to the obtained sampling voltage to adjust the driving voltage provided by the power conversion circuit to the driving motor, thereby controlling the driving motor to provide different stalled torques, and thereby adjusting the powder pressing force of the brewing device, so that the beverage machine can provide beverages with different tastes, enrich the functions of the beverage machine, and effectively improve the user experience.

[0074] For details, see Figure 1 , Figure 1It is a structural block diagram of the control circuit provided by the present application. The control circuit provided by the present application includes: a voltage regulating circuit 10, a power conversion circuit 20, a voltage detection circuit 30 and a controller 40. The input end of the voltage regulating circuit 10 is connected to the first power supply P1, and the output end of the voltage regulating circuit 10 is connected to the input end of the power conversion circuit 20; the output end of the power conversion circuit 20 is respectively connected to the drive motor 50 of the beverage machine and the sampling end of the voltage detection circuit 30; the feedback end of the voltage detection circuit 30 is connected to the controller 40, and the voltage detection circuit 30 provides the controller 40 with a sampling voltage corresponding to the current driving voltage of the driving motor 50; the controller 40 is connected to the control end of the voltage regulating circuit 10, and the controller 40 transmits a control signal for controlling the voltage regulating circuit 10 to the voltage regulating circuit 10, so as to adjust the driving voltage provided by the power conversion circuit 20 to the driving motor 50, and the control signal is generated based on the sampling voltage.

[0075] Combine Figure 1 As shown, a first power source P1 is connected to the input of the voltage regulator circuit 10 to provide electrical energy to the voltage regulator circuit 10. The output of the voltage regulator circuit 10 is connected to the input of the power conversion circuit 20, and the output of the power conversion circuit 20 is connected to the drive motor 50. Based on the aforementioned connection relationship, the electrical energy provided by the first power source P1 enters the power conversion circuit 20 through the voltage regulator circuit 10. The power conversion circuit 20 converts the electrical energy processed by the voltage regulator circuit 10 into electrical energy that matches the drive motor 50. For example, if the first power source P1 provides AC power and the drive motor 50 is a DC motor, in this case, the power conversion circuit 20 needs to convert the AC power into DC power before providing it to the drive motor 50 to control the operation of the drive motor 50. For another example, if the first power source P1 provides DC power, but the DC voltage it provides does not match the operating voltage of the drive motor 50, in this case, the power conversion circuit 20 converts the DC voltage to DC power before outputting it to the drive motor 50. However, no matter what specific power conversion processing the power conversion circuit 20 performs, its operation process is completed by the voltage regulating circuit 10 based on the control signal of the controller 40. Of course, the specific implementation method of the voltage regulating circuit 10 regulating the output voltage of the power conversion circuit 20 is related to the specific structure of the power conversion circuit 20 and the power conversion process. This process will be elaborated in detail in subsequent content and will not be described in detail here.

[0076] Furthermore, the sampling terminal of the voltage detection circuit 30 is connected to the output terminal of the power conversion circuit 20 to collect the voltage at the output terminal of the power conversion circuit 20. In addition, the feedback terminal of the voltage detection circuit 30 is connected to the controller 40 to provide a corresponding sampling voltage to the controller 40 via the feedback terminal of the voltage detection circuit 30. The sampling voltage corresponds to the current driving voltage of the drive motor 50. It can be understood that the output voltage of the power conversion circuit 20 is the driving voltage of the drive motor 50. Therefore, collecting the voltage at the output terminal of the power conversion circuit 20 by the voltage detection circuit 30 is equivalent to collecting the driving voltage of the drive motor 50. As a preferred embodiment, the sampling voltage provided by the voltage detection circuit 30 corresponds to a preset proportional relationship with the driving voltage of the drive motor 50, and the two are positively correlated. That is, the greater the driving voltage of the drive motor 50, the greater the sampling voltage. Conversely, the smaller the driving voltage of the drive motor 50, the smaller the obtained sampling voltage.

[0077] The controller 40 controls the voltage regulator circuit 10 based on the sampled voltage to adjust the drive voltage provided by the power conversion circuit 20 to the drive motor 50. Continuing with the previous example, the sampled voltage provided by the voltage detection circuit 30 corresponds to a preset proportional relationship with the drive voltage of the drive motor 50. After obtaining the sampled voltage, the controller 40 calculates the current drive voltage corresponding to the sampled voltage based on the preset proportional relationship. The controller 40 then controls the voltage regulator circuit 10 based on the current drive voltage, ultimately adjusting the drive voltage provided by the power conversion circuit 20 to the drive motor 50.

[0078] As mentioned above, the driving voltage of the driving motor is adjustable, which means that the driving motor can provide different stall torques. Based on this, when applied to beverage machines such as coffee machines, the control circuit provided in this application can be used to control the driving motor to provide different stall torques, control the brewing device to provide different powder pressing forces, and ultimately provide coffee powder cakes with different compactness, that is, provide coffee powder cakes with different densities, to meet users' drinking needs for coffee with different flavors.

[0079] To sum up, the control circuit provided in the present application can control the voltage regulating circuit according to the sampling voltage provided by the voltage detection circuit corresponding to the current driving voltage of the driving motor to adjust the driving voltage provided by the power conversion circuit to the driving motor, and then control the driving motor to provide different stall torques, so that the beverage machine can provide beverages with different tastes, enrich the functions of the beverage machine, and effectively improve the user experience.

[0080] Based on the above content, when the first power supply P1 provides AC power, for example, the first power supply P1 is an AC220V AC power supply, an optional implementation of a voltage regulating circuit provided in this application is as follows: Figure 2As shown, the voltage regulating circuit 10 provided in this embodiment includes a driving circuit 110 and a chopping circuit 120. The input end of the chopping circuit 120 serves as the input end of the voltage regulating circuit 10, and the output end of the chopping circuit 120 serves as the output end of the voltage regulating circuit 10. The control end of the driving circuit 110 serves as the control end of the voltage regulating circuit 10, and the driving end of the driving circuit 110 is connected to the control end of the chopping circuit 120. The driving circuit 110 switches the conduction state of the chopping circuit 120 in response to the control signal of the controller 40. The driving circuit 110 includes a first photocoupler U1, a first protection resistor R1, a second protection resistor R2, and a third protection resistor R3. The chopping circuit 120 includes a bidirectional thyristor U2.

[0081] Specifically, the first input terminal U11 of the first photocoupler U1 is connected to the second power supply P2, which can be, for example, DC3.3V. The second input terminal U12 of the first photocoupler U1 is connected to one end of the first protection resistor R1, and the other end of the first protection resistor R1 serves as the control terminal C1 of the drive circuit 110, that is, as the control end of the voltage regulating circuit 10, connected to the controller 40, and receives the control signal provided by the controller 40.

[0082] One end of the second protection resistor R2 is connected to the first end of the bidirectional thyristor U2, and the other end of the second protection resistor R2 is connected to the first output terminal U13 of the first photocoupler U1. Furthermore, one end of the third protection resistor R3 is connected to the second end of the bidirectional thyristor U2, and the other end of the third protection resistor R3 is connected to the second output terminal U14 of the first photocoupler U1. The connection point between the second output terminal U14 of the first photocoupler U1 and the third protection resistor R3 is connected to the control terminal of the bidirectional thyristor U2. The connection point between the second output terminal U14 of the first photocoupler U1 and the third protection resistor R3 serves as the driving terminal of the driving circuit 110, and the control terminal of the bidirectional thyristor U2 serves as the control terminal of the chopper circuit 120.

[0083] The first end of the bidirectional thyristor U2 is connected to the first power supply P1 as the input end of the chopper circuit 120, that is, as the input end of the voltage regulating circuit 10. Figure 2 As shown, when the first power supply P1 selects AC220V power supply, the first end of the bidirectional thyristor U2 is connected to the live wire ( Figure 2 Furthermore, the second end of the bidirectional thyristor U2 serves as the output end of the chopper circuit 120, that is, as the output end of the voltage regulating circuit 10, and is connected to the power conversion circuit 20 at the subsequent stage, providing the power conversion circuit 20 with the alternating current ( Figure 2 (shown as P1_out in FIG).

[0084] Furthermore, the present application also provides another optional implementation of the voltage regulating circuit. Figure 2 On the basis of the illustrated embodiment, the voltage regulating circuit 10 provided in this embodiment further includes a first protection circuit 130 .

[0085] Combine Figure 3 As shown, the first protection circuit 130 is connected between the first end and the second end of the bidirectional thyristor U2, and the first end of the bidirectional thyristor U2 is connected to the first power supply P1. The first protection circuit 130 is used to clamp the voltage between the first end and the second end of the bidirectional thyristor U2 to a first safety voltage when the voltage of the first power supply P1 is greater than the first voltage threshold.

[0086] As an optional implementation, Figure 3 The first protection circuit 130 in the illustrated embodiment includes a varistor Rv. Based on the working characteristics of the varistor Rv, it can be seen that when the voltage across it is greater than the preset protection voltage, the varistor Rv can clamp the voltage across it at the preset voltage. Based on this, in this embodiment, the preset protection voltage of the varistor Rv meets the voltage fluctuation of the first power supply P1 and the withstand voltage level of the subsequent power conversion circuit 20. It can be understood that the preset protection voltage corresponding to the varistor Rv is the first voltage threshold of the first protection circuit 130. Accordingly, the preset voltage after the varistor Rv is clamped is the aforementioned first safety voltage.

[0087] It should be noted that for Figure 2 as well as Figure 3 The voltage regulating circuit 10 provided in the illustrated embodiment has a similar process for regulating the input voltage of the subsequent power conversion circuit 20. The controller 41 provides a control signal to the control terminal C1 of the drive circuit 110. In response to the obtained control signal, the drive circuit 110 switches the conduction state of the chopper circuit 120 to chop the AC power provided by the first power supply P1, thereby changing the voltage output to the power conversion circuit 20.

[0088] In a preferred embodiment, the control signal provided by the controller 40 is a pulse signal. Figure 2Taking the voltage regulating circuit 10 shown as an example, within any pulse cycle, the pulse signal includes a low level and a high level. Based on this, during the low-level phase of the pulse signal, the input side of the first photocoupler U1 is turned on, and the light-emitting diode emits light. At the same time, the first protection resistor R1 limits the current on the input side of the first photocoupler U1 to ensure the safety of the device. Furthermore, the output side of the first photocoupler U1 is turned on. Under the action of the first power supply P1, the second protection resistor R2 and the third protection resistor R3 divide the voltage and provide a high level to the control end of the bidirectional thyristor U2, turning on the bidirectional thyristor U2. Accordingly, during the high-level phase of the pulse signal, the input side of the first photocoupler U1 is turned off, and accordingly, the output side of the first photocoupler U1 is also turned off, thereby driving the bidirectional thyristor U2 to turn off. Among them, the second protection resistor R2 can also prevent the first photocoupler U1 from being damaged by the voltage surge of the first power supply P1, and the third protection resistor R3 can prevent the bidirectional thyristor U2 from being mis-turned on.

[0089] Based on the above, by providing a pulse signal that changes according to a preset period to the voltage regulating circuit 10, the bidirectional thyristor U2 can be controlled to periodically turn on and off, thereby achieving chopping processing of the AC voltage of the first power supply P1 and adjusting the input voltage of the power conversion circuit 20 connected to the downstream stage. In actual applications, when the AC voltage provided by the first power supply P1 is stable, the output voltage of the chopping circuit 120 corresponds to the value of the duty cycle of the pulse signal. By adjusting the duty cycle of the provided pulse signal, the controller 40 can control the voltage regulating circuit 10 to adjust the input voltage to the power conversion circuit 20. As for the specific configuration of the pulse signal and the specific control process of the voltage regulating circuit 10, reference can be made to the relevant technical implementation and will not be described in detail here.

[0090] Furthermore, the present application provides an optional implementation of the power conversion circuit 20, see Figure 4 As shown, the power conversion circuit 20 provided in this embodiment includes a transformer T1 and a rectifier circuit 210 , wherein the rectifier circuit 210 includes a rectifier bridge stack U3 , and on this basis, a filter capacitor C1 is further provided in the rectifier circuit 210 .

[0091] Combine Figure 4 As shown, the primary side of the transformer T1 is connected to the output end of the voltage regulating circuit 10 of the previous stage as the input end of the power conversion circuit 20. Figure 2 As an example, the voltage regulating circuit 10 shown in FIG. 1 is connected to the primary winding of the transformer T1 at one end I1. Figure 2As shown, the primary winding is connected to P1_out, and the other end I2 of the primary winding is connected to the neutral line of the first power supply P1. Furthermore, the secondary side of the transformer T1 is connected to the input end of the rectifier bridge stack U3 in the rectifier circuit 210. The output end of the rectifier circuit U3 serves as the output end out1 of the power conversion circuit 20, and is respectively connected to the sampling end of the drive motor 50 and the voltage detection circuit 30, outputting the converted DC voltage. As for the specific working principles of the transformer T1 and the rectifier bridge stack U3, please refer to the relevant technology and will not be elaborated here.

[0092] Furthermore, the filter capacitor C1 can filter out the AC component in the DC voltage output by the rectifier bridge stack U3 , thereby further improving the quality of the driving voltage provided to the driving motor 50 .

[0093] This application also provides an optional implementation of the voltage detection circuit 30, combined with Figure 5 As shown, the voltage detection circuit 30 provided in this embodiment includes a voltage divider circuit 310 , wherein the voltage divider circuit 310 includes a first voltage divider resistor R4 and a second voltage divider resistor R5 .

[0094] Specifically, one end of the first voltage-dividing resistor R4 serves as the sampling terminal I3 of the voltage detection circuit 30 and is connected to the output terminal out1 of the power conversion circuit 20. The other end of the first voltage-dividing resistor R4 is connected to one end of the second voltage-dividing resistor R5, and the other end of the second voltage-dividing resistor R5 is grounded, that is, the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 are connected in series. Furthermore, the connection point of the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 serves as the feedback terminal out2 of the voltage detection circuit 30 and is connected to the controller 40. The control signal is generated based on the relationship between the current driving voltage of the drive motor 50 and the target voltage. The current driving voltage of the drive motor 50 is determined based on the voltage dividing ratio of the voltage-dividing circuit 310 and the sampling voltage. It can be understood that when the power conversion circuit 20 is operating normally, the voltage across the second voltage-dividing resistor R5 (also the voltage at the connection point of the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5) is the sampling voltage fed back to the controller 40 by the voltage detection circuit 30.

[0095] It is understood that for a specific voltage divider circuit 310, the resistance values ​​of the voltage divider resistors constituting the voltage divider circuit 310 are determined, i.e., the resistance values ​​of the first voltage divider resistor R4 and the second voltage divider resistor R5 are determined. Accordingly, the voltage divider ratio of the voltage divider circuit 310 is also determined. In practical applications, the voltage divider ratio of the voltage divider circuit 310 can be pre-stored as a configuration parameter in the controller 40. Based on this, after obtaining the sampled voltage, the controller 40 can determine the current drive voltage provided by the power conversion circuit 20 to the drive motor 50 based on the pre-stored voltage divider ratio of the voltage divider circuit 310 and the sampled voltage. Based on the relationship between the current drive voltage and the target voltage, the controller 40 controls the voltage regulator circuit 10 to adjust the drive voltage provided by the power conversion circuit 20 to the drive motor 50. It is understood that if the current drive voltage is greater than the target voltage, the voltage regulator circuit 10 is controlled to reduce the drive voltage provided by the power conversion circuit 20 to the drive motor 50. Correspondingly, if the current drive voltage is less than the target voltage, the controller 10 is controlled to increase the drive voltage provided by the power conversion circuit 20 to the drive motor 50.

[0096] It should be noted that the specific value of the target voltage can be determined in practice based on actual needs. Still taking a coffee machine as an example, as previously described, the control circuit provided in this application can enable the coffee machine to provide different flavors of coffee to the user. To achieve this, the drive motor 50 needs to provide different stall torques to the brewing device. This allows the brewing device to provide different powder compaction forces under the action of different stall torques, thereby obtaining coffee powder cakes with different densities, ultimately providing the user with different flavors of coffee. The stall torque of the drive motor 50 corresponds to the drive voltage of the drive motor 50. Providing different stall torques means that the control circuit needs to provide different drive voltages to the drive motor 50. It can be understood that different coffee flavors each correspond to a stall torque, that is, each different coffee flavor corresponds to a corresponding stall torque, and thus a corresponding drive voltage. Based on this, after determining the coffee flavor provided by the coffee machine, the drive voltage corresponding to that coffee flavor can be determined. This drive voltage is the target voltage described in this embodiment. In practice, the controller 40 can be configured to pre-store the target voltages corresponding to various coffee flavors in the controller 40. The user selects the corresponding coffee flavor by operating the control panel of the coffee machine. The controller 40 can determine the corresponding target voltage based on the selected coffee flavor, and then execute the above-mentioned process of controlling the voltage regulating circuit 10 to adjust the driving voltage provided by the power conversion circuit 20 to the driving motor 50 based on the magnitude relationship between the current driving voltage and the target voltage. Of course, the configuration of the target voltage and the controller selecting the target voltage can also be achieved in other ways, which will not be detailed here, and this application does not limit this process. Further, in combination with Figure 5As shown, the voltage detection circuit 30 provided in this embodiment also includes a second protection circuit 320, which is connected to the connection point of the first voltage divider resistor R4 and the second voltage divider resistor R5. The second protection circuit 320 is used to clamp the sampling voltage to a second safety voltage when the sampling voltage is greater than the second voltage threshold.

[0097] The second protection circuit 320 includes a diode D1, the anode of the diode D1 is connected to the connection point of the first voltage divider resistor R4 and the second voltage divider resistor R5, and the cathode of the diode D1 is connected to the second power supply P2. When the sampling voltage provided by the voltage divider circuit 310 is greater than the second voltage threshold, the sampling voltage is clamped to the second safety voltage. Figure 5 Taking the illustrated embodiment as an example, the cathode of the diode D1 is connected to the second power supply P2. Assuming that the voltage of the second power supply P2 is DC3.3V, the conduction voltage drop of the diode D1 is 0.7V. In this case, the second voltage threshold corresponding to this embodiment is 0.7+3.3=4V. When the sampling voltage is greater than 4V, the diode D1 is turned on, thereby clamping the sampling voltage fed back by the voltage detection circuit 30 to the second safety voltage, i.e., 4V.

[0098] It should be noted that Figure 5 The structure of the voltage divider circuit 310 in the embodiment shown is only an optional example. In actual applications, the implementation of the first voltage divider resistor R4 and the second voltage divider resistor R5 can be selected according to actual conditions. Taking the first voltage divider resistor R4 as an example, it can be referred to Figure 5 As shown, a corresponding resistance element is set, and multiple resistance elements can also be connected in series as long as they can provide Figure 5 In the embodiment shown, the first voltage-dividing resistors R4 may have the same resistance value.

[0099] Please refer to Figure 5 The voltage detection circuit 30 provided in this embodiment is further provided with a filter capacitor C2, which filters out the AC component in the sampled voltage, thereby providing a sampled voltage with better quality to the controller 40.

[0100] As previously mentioned, the drive motor 50 enters a stalled state and provides stall torque only when driving the brewing device to compress coffee powder into a coffee cake. Therefore, the most efficient control method is to collect the current drive voltage provided by the power conversion circuit 20 when the drive motor 50 is stalled, and adjust the output of the power conversion circuit 20 based on the relationship between the current drive voltage and the target voltage. The control circuits provided in the aforementioned embodiments do not involve identifying the stalled state of the drive motor 50. The controller can obtain sampled voltages according to a preset sampling period and perform the above control process. Obviously, this method has at least the following disadvantages: First, if the sampling period is not set properly, the stalled state of the drive motor 50 may be missed. Second, even when the drive motor 50 is not stalled, the above control process is still executed according to the sampling period, increasing the logic overhead of the controller 40 and the overall power consumption of the beverage dispenser. Furthermore, when the first power supply P1 is an AC power source, since the first power supply P1 provides an alternating AC voltage, how to adjust the output drive voltage based on the phase change of the AC voltage also affects the overall performance of the control circuit and the stability of the beverage dispenser operation.

[0101] In order to solve the above problems, the present application provides another control circuit, combined with Figure 6 As shown, based on the above-mentioned embodiment, the control circuit provided in this embodiment further includes a state detection circuit 60. The feedback end of the state detection circuit 60 is connected to the controller 40. The state detection circuit 60 outputs a detection signal to the controller 40. The detection signal is output when the drive motor 50 is stalled. When the controller 40 receives the detection signal, the controller 40 outputs a control signal to the voltage regulation circuit 10.

[0102] Specifically, the state detection circuit 60 detects the operating state of the drive motor 50 and outputs a detection signal when the drive motor 50 is stalled. The controller 40 is connected to the feedback terminal of the state detection circuit 60. The controller 40 controls the voltage regulation circuit 10 based on the sampled voltage corresponding to the current drive voltage of the drive motor 50, thereby adjusting the drive voltage provided by the power conversion circuit 20 to the drive motor 50. Specifically, in response to the detection signal fed back by the state detection circuit 60, the controller 40 obtains the sampled voltage fed back by the voltage detection circuit 30 and controls the voltage regulation circuit 10 based on the obtained sampled voltage to adjust the drive voltage provided by the power conversion circuit 20 to the drive motor 50.

[0103] It is understood that only when the drive motor 50 is in a stalled state is the sampled voltage corresponding to the current drive voltage of the drive motor 50 collected, and the output of the power conversion circuit 20 is adjusted based on the relationship between the current drive voltage and the target voltage to achieve the most efficient control. When the drive motor 50 is not stalled, there is no need to obtain the sampled voltage to adjust the output of the power conversion circuit 20. In an optional embodiment, after receiving the detection signal, the duration of the stall of the drive motor 50 is counted, and when the duration reaches a preset duration threshold, the controller 40 outputs a control signal to the voltage regulation circuit 10. In response to the detection signal, the controller 40 counts the duration of the stall of the drive motor 50, and when the duration reaches the preset duration threshold, controls the voltage regulation circuit 10 to adjust the drive voltage provided by the power conversion circuit 20 to the drive motor 50 based on the obtained sampled voltage corresponding to the current drive voltage of the drive motor 50. It is understood that during the aforementioned control process, upon receiving the detection signal, the controller 40 does not immediately initiate the voltage regulation process. Instead, it only initiates the voltage regulation process when the duration of the drive motor 50 stalling reaches a preset duration threshold. This configuration effectively avoids misjudgments caused by factors such as drive voltage fluctuations and external electromagnetic interference during actual applications. The drive voltage is only adjusted after the drive motor 50 has been stalled for a predetermined duration threshold, thereby effectively improving the reliability of the control circuit. The specific value of the preset duration threshold can be determined based on a combination of factors such as the control accuracy requirements during actual applications, the electromagnetic conditions of the control circuit application environment, and the stability of the drive voltage. This application does not impose specific limitations on this.

[0104] See also Figure 7 As shown, the present application provides an optional implementation of a status detection circuit. The status detection circuit provided in this embodiment includes: a current limiting resistor R6, a pull-up resistor R7 and a photointerrupter U3, wherein the photointerrupter U3 includes a light-emitting component (shown as a light-emitting diode) and a light-receiving component (shown as a photosensitive semiconductor device).

[0105] Combine Figure 7 As shown, one end of current-limiting resistor R6 is connected to the second power supply P2, and the other end is connected to the input of the light-emitting component. The output of the light-emitting component is grounded. When the beverage dispenser to which the control circuit belongs is powered on, the second power supply P2 provides a preset power supply voltage, such as DC3.3V. Based on this voltage, the light-emitting component of photointerrupter U3 operates normally and provides light to the light-receiving component.

[0106] One end of the pull-up resistor R7 is connected to the second power supply P2, and the other end is connected to the input end of the light-receiving component. The output end of the light-receiving component is grounded. When there is no obstruction between the light-emitting component and the light-receiving component of the photointerrupter U3, the light-receiving component is turned on. On the contrary, when there is an obstruction between the light-emitting component and the light-receiving component, the light-receiving component will be turned off because it cannot receive the light provided by the light-emitting component.

[0107] The connection point between the light receiving component and the pull-up resistor R7 is connected to the controller 40 , and the connection point between the light receiving component and the pull-up resistor R7 serves as the feedback end of the state detection circuit 60 (shown as out3 in the figure), providing a detection signal to the controller 40 .

[0108] In actual applications, the photointerrupter U3 in the status detection circuit 60 is arranged close to the rotating shaft of the drive motor 50, and a shielding member that rotates synchronously with the rotating shaft is provided on the rotating shaft. When the shielding member passes through the gap between the light-emitting component and the light-receiving component, it will block the light transmission between the two. That is to say, as the rotating shaft of the drive motor 50 rotates, the shielding member will periodically block the light between the light-emitting component and the light-receiving component according to the rotation period of the rotating shaft of the drive motor 50.

[0109] As mentioned above, when the shielding member is between the light-emitting component and the light-receiving component, the light-receiving component is turned off, and under the action of the pull-up resistor R7, the state detection circuit 60 outputs a high level to the outside; on the contrary, when the shielding member is not between the light-emitting component and the light-receiving component, the light-receiving component is turned on, and the state detection circuit 60 outputs a low level to the outside. Based on this, when the drive motor 50 is not blocked, the state detection circuit 60 will continue to output a periodic pulse signal, and when the drive motor 50 is blocked, the state detection circuit will output a high level, that is, the aforementioned detection signal. Further, combined with Figure 6 As shown, based on the above embodiment, when the first power supply P1 is an AC power supply, the control circuit provided in this embodiment further includes a zero-crossing detection circuit 70. The detection terminal of the zero-crossing detection circuit 70 is connected to the first power supply P1, and the feedback terminal of the zero-crossing detection circuit 70 is connected to the controller 40. The zero-crossing detection circuit 70 can detect the amplitude change of the output voltage of the first power supply P1 and output an enable signal to the controller 40 when the amplitude of the output voltage crosses the zero value; the control signal is generated based on the sampled voltage and the enable signal.

[0110] exist Figure 6 In the illustrated embodiment, the controller 40 controls the voltage regulating circuit 10 to adjust the driving voltage provided by the power conversion circuit 20 to the driving motor 50 based on the sampling voltage provided by the voltage detection circuit 30, the enable signal provided by the zero-crossing detection circuit 70, and the detection signal provided by the state detection circuit 60.

[0111] Combine Figure 8 As shown, as an optional implementation, the zero-crossing detection circuit 70 provided in the present application includes a second photocoupler U4 and a first detection resistor R8.

[0112] Specifically, the input ends of the second photoelectric coupler U4 (i.e., U41 and U42) serve as the detection ends of the zero-crossing detection circuit 70 and are connected to the first power supply P1. In actual applications, the first input end U41 of the second photoelectric coupler U4 can be connected to the live wire of the first power supply P1, and accordingly, the second input end U42 of the second photoelectric coupler U4 can be connected to the neutral wire of the first power supply P1. Furthermore, the first output end U43 of the second photoelectric coupler U4 is connected to one end of the first detection resistor R8, the second output end U44 of the second photoelectric coupler U4 is grounded, and the other end of the first detection resistor R8 is connected to the second power supply P2. The connection point between the second photoelectric coupler U4 and the first detection resistor R8 serves as the feedback end out4 of the zero-crossing detection circuit 70 and is connected to the controller 40.

[0113] In actual application, when the AC voltage provided by the first power supply P1 is in the positive half cycle, the second optocoupler U4 does not work and no signal is input to the controller 40. When the AC voltage is in the negative half cycle, the second optocoupler U4 is turned on, and the feedback end out4 of the zero-crossing detection circuit 70 outputs a low level. As the AC voltage passes through the zero point, the second optocoupler U4 switches from the on state to the off state, and the feedback end out4 of the zero-crossing detection circuit 70 outputs a high level. The rising edge from the low level to the high level is transmitted to the controller 40 as an enable signal. The controller 40 recognizes the rising edge signal provided by the zero-crossing detection circuit 70, that is, determines that the AC voltage provided by the first power supply P1 passes through the zero point.

[0114] Furthermore, the present application also provides another zero-crossing detection circuit. Figure 8 Based on the examples shown, please refer to Figure 9 The zero-crossing detection circuit 70 provided in this embodiment further includes a third protection circuit, which is connected between the first input terminal U41 and the second input terminal U42 of the second photoelectric coupler U4. When the output voltage of the first power supply P1 is greater than the third voltage threshold, the third protection circuit clamps the voltage between the first input terminal U41 and the second input terminal U42 of the second photoelectric coupler U4 to a third safety voltage.

[0115] Combine Figure 9As shown, the third protection circuit includes a diode D2, the anode of the diode D2 is connected to the first input terminal U41 of the second optocoupler U4, and the connection point between the anode of the diode D2 and the first input terminal U41 serves as the first input terminal I4 of the zero-crossing detection circuit 70. In actual application, it is connected to the live wire of the first power supply P1, and the cathode of the diode D2 is connected to the second input terminal U42 of the second optocoupler U4. The conduction voltage of the diode D2 is the aforementioned third voltage threshold. When the diode D2 is turned on, the conduction voltage drop across it is the third safety voltage.

[0116] Further, in Figure 9 The zero-crossing detection circuit 70 provided in the illustrated embodiment further includes current-limiting resistors R9, R10, and R11. One end of the current-limiting resistor R11 serves as the second input terminal I5 of the zero-crossing detection circuit 70 and, in practical applications, is connected to the zero line of the first power supply P1. It is understood that the current-limiting resistors can prevent excessive current in the corresponding circuit, thereby improving the safety of circuit operation. For the specific connection method of each current-limiting resistor, please refer to Figure 9 As shown, no further details are given here.

[0117] By setting up the zero-crossing detection circuit 70 , the controller 40 can control the bidirectional thyristor U2 in the voltage regulating circuit 10 to turn on at different phases according to the enable signal provided by the zero-crossing detection circuit 70 , thereby adjusting the driving voltage provided by the power conversion circuit 20 to the driving motor 50 .

[0118] See also Figure 10 As shown, the zero-crossing detection circuit 70 outputs an enable signal when the AC voltage is at a zero-crossing point such as 10ms, 20ms, 40ms, etc., so that the controller 40 can accurately know the zero-crossing point of the AC voltage provided by the first power supply P1. When the voltage regulating circuit 10 is controlled to adjust the driving voltage provided by the power conversion circuit 20 to the drive motor 50, a delay control can be performed based on the obtained enable signal to realize turning on the bidirectional thyristor U2 in the voltage regulating circuit 10 at different times. For example, in response to the enable signal provided by the zero-crossing detection circuit 70 at 20ms, a delay of 5ms is performed, the bidirectional thyristor U2 is turned on at 25ms, and the bidirectional thyristor U2 is turned off at 30ms, so that the bidirectional thyristor U2 can be controlled to be continuously turned on for 5ms. Based on this, by controlling the conduction state of the bidirectional thyristor U2, the driving voltage ultimately output to the drive motor 50 can be adjusted.

[0119] The following is an application of coffee machine Figure 6 Taking the control circuit shown as an example, the complete working process of the control circuit provided by this application is briefly introduced.

[0120] Based on the aforementioned one-to-one correspondence between coffee flavor, tamping force, stall torque, and drive voltage, the coffee machine is configured before shipment to provide a variety of coffee flavors, along with corresponding target voltages and a preset threshold for identifying a stalled drive motor. When a user selects a specific coffee flavor through the coffee machine, the controller determines the target voltage corresponding to the selected flavor based on the user's selection.

[0121] In response to the user's start-up operation, the controller 40 controls the voltage regulating circuit 10 to start, supplies power to the power conversion circuit 20, and provides a driving voltage to the drive motor 50 through the power conversion circuit 20. The drive motor 50 drives the brewing device to perform the powder pressing action. At the same time, the status detection circuit 60 detects the operating status of the drive motor 50.

[0122] When the state detection circuit 60 detects that the drive motor 50 is in a stalled state based on the above content, it feeds back a detection signal to the controller 40. In response to the obtained detection signal, the controller 40 counts the duration of the drive motor 50 in the stalled state. When the duration reaches the above-mentioned preset duration threshold, the controller 40 obtains the sampling voltage corresponding to the current driving voltage of the drive motor 50 fed back by the voltage detection circuit 30, and determines the current driving voltage of the drive motor 50 based on the obtained sampling voltage.

[0123] Based on the working principle of the aforementioned zero-crossing detection circuit 70, it can be seen that when the first power supply P1 begins to power the control circuit, the zero-crossing detection circuit 70 synchronously detects the zero-crossing moment of the AC voltage of the first power supply P1 and provides an enable signal when the zero-crossing moment is detected. In other words, the enable signal provided by the zero-crossing detection circuit 70 is periodically repeated. Based on this, the controller 40 has two ways to respond to the enable signal: one is to receive the enable signal provided by the zero-crossing detection circuit 70 in real time, but will not respond to all enable signals. Only after receiving the detection signal provided by the state detection circuit 60 will the controller 40 start the timing operation related to adjusting the conduction state of the bidirectional thyristor U2 based on the enable signal after the detection signal; the other is to refer to the processing method of the aforementioned sampled voltage, that is, to respond to the enable signal provided by the zero-crossing detection circuit 70 only after receiving the detection signal.

[0124] Furthermore, after determining the current driving voltage, the controller 40 determines a method for adjusting the conduction state of the bidirectional thyristor U2 in the voltage regulation circuit 10 based on the relationship between the current driving voltage and the target voltage and the enable signal. The controller 40 controls the conduction state of the bidirectional thyristor U2 according to the resulting adjustment method, chopping the AC voltage provided by the first power supply P1, thereby adjusting the AC voltage output to the power conversion circuit 20, and ultimately adjusting the drive voltage provided by the power conversion circuit 20 to the drive motor 50. The specific method for adjusting the conduction state of the bidirectional thyristor U2 can be implemented with reference to related technologies and will not be described in detail here.

[0125] In another optional embodiment, if the state detection circuit 60 is not provided in the control circuit, the controller 40 can control the voltage regulation circuit 10 to adjust the driving voltage provided by the power conversion circuit 20 to the driving motor 50 only according to the sampling voltage provided by the voltage detection circuit 30 and the enable signal provided by the zero-crossing detection circuit 70. The difference from the aforementioned embodiment is that since it is impossible to determine whether the driving motor 50 is stalled, the driving voltage adjustment process will also be carried out when the driving motor 50 is not stalled, but there are disadvantages of wasting controller logic overhead and high energy consumption of the control circuit.

[0126] Furthermore, for the control circuit provided in any of the above embodiments, a motor control circuit 80 may be provided in the control circuit. Figure 11 In actual applications, the motor control circuit 80 is connected between the power conversion circuit 20 and the drive motor 50. Simultaneously, the controller 40 is connected to the control terminal of the motor control circuit 80. The controller 40 can control the operating state of the drive motor 50 through the motor control circuit 80, such as starting and stopping the drive motor 50 and switching the rotation direction of the drive motor 50. The specific structure of the motor control circuit 80 can be implemented with reference to related technologies and will not be described in detail here.

[0127] The present application also provides a beverage machine, comprising a drive motor, a brewing device, and the control circuit of the beverage machine provided by any of the aforementioned embodiments, wherein the drive motor is drivingly connected to the brewing device.

[0128] In actual applications, the beverage machine provided in this application can be a coffee machine, a soybean milk machine, a juicer, and other equipment that requires a drive motor, which will not be listed here one by one.

[0129] Those skilled in the art will appreciate that the contents disclosed in this disclosure may be subject to various modifications and improvements. For example, the various devices or components described above may be implemented through hardware, software, firmware, or a combination of some or all of the three.

[0130] In addition, although the present disclosure makes various references to certain units in the system according to embodiments of the present disclosure, any number of different units can be used and run on the client and / or server. The units are only illustrative, and different aspects of the system and method can use different units.

[0131] Flowcharts are used in this disclosure to illustrate the steps of the methods according to the embodiments of the present disclosure. It should be understood that the preceding or following steps do not necessarily need to be performed in exact order. Instead, the various steps may be performed in reverse order or simultaneously. Furthermore, other operations may be added to these processes.

[0132] Those skilled in the art will appreciate that all or part of the steps in the above method can be performed by instructing the relevant hardware using a computer program, and the program can be stored in a computer-readable storage medium, such as a read-only memory. Alternatively, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module / unit in the above embodiment can be implemented in the form of hardware or in the form of software functional modules. The present disclosure is not limited to any particular combination of hardware and software.

[0133] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or highly formal sense unless expressly defined as such herein.

[0134] The above is an illustration of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure have been described, it will be readily understood by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the above is an illustration of the present disclosure and should not be considered as limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A control circuit for a beverage machine, characterized in that: include: Voltage regulating circuit, power conversion circuit, voltage detection circuit and controller, wherein, The input end of the voltage regulating circuit is connected to the first power supply, and the output end of the voltage regulating circuit is connected to the input end of the power conversion circuit; The output end of the power conversion circuit is connected to the driving motor of the beverage machine and the sampling end of the voltage detection circuit respectively; The feedback end of the voltage detection circuit is connected to the controller, and the voltage detection circuit provides the controller with a sampling voltage corresponding to the current driving voltage of the driving motor; The controller is connected to the control end of the voltage regulating circuit. The controller transmits a control signal to the voltage regulating circuit to adjust the driving voltage provided by the power conversion circuit to the driving motor. The control signal is generated based on the sampled voltage.

2. The control circuit according to claim 1, wherein: The voltage regulating circuit includes: a driving circuit and a chopping circuit, wherein: The input end of the chopper circuit serves as the input end of the voltage regulating circuit, and the output end of the chopper circuit serves as the output end of the voltage regulating circuit; The control end of the driving circuit serves as the control end of the voltage regulating circuit, and the driving end of the driving circuit is connected to the control end of the chopper circuit; The drive circuit switches the conduction state of the chopper circuit in response to the control signal of the controller.

3. The control circuit according to claim 2, characterized in that: The driving circuit includes: a first photocoupler, a first protection resistor, a second protection resistor and a third protection resistor; the chopping circuit includes: a bidirectional thyristor, wherein: The first input end of the first photoelectric coupler is connected to the second power supply, and the second input end of the first photoelectric coupler is connected to one end of the first protection resistor; The other end of the first protection resistor serves as the control end of the driving circuit; One end of the second protection resistor is connected to the first end of the bidirectional thyristor, and the other end of the second protection resistor is connected to the first output end of the first photocoupler; One end of the third protection resistor is connected to the second end of the bidirectional thyristor, and the other end of the third protection resistor is connected to the second output end of the first photocoupler; A connection point between the second output terminal of the first photocoupler and the third protection resistor serves as a driving terminal of the driving circuit and is connected to a control terminal of the bidirectional thyristor.

4. The control circuit according to claim 3, characterized in that: The voltage regulating circuit further includes: a first protection circuit, wherein: The first protection circuit is connected between the first terminal and the second terminal of the bidirectional thyristor; The first end of the bidirectional thyristor is connected to the first power supply, and the first protection circuit is used to clamp the voltage between the first end and the second end of the bidirectional thyristor to a first safety voltage when the voltage of the first power supply is greater than a first voltage threshold.

5. The control circuit according to claim 1, wherein: The voltage detection circuit includes: a voltage divider circuit, wherein: The voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor, wherein: One end of the first voltage-dividing resistor serves as a sampling end of the voltage detection circuit and is connected to the output end of the power conversion circuit; the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor; and the other end of the second voltage-dividing resistor is grounded; The connection point between the first voltage-dividing resistor and the second voltage-dividing resistor serves as a feedback terminal of the voltage detection circuit and is connected to the controller; The control signal is generated based on a magnitude relationship between a current driving voltage of the driving motor and a target voltage. The current driving voltage of the driving motor is determined according to a voltage dividing ratio of the voltage dividing circuit and the sampled voltage.

6. The control circuit according to claim 1, wherein: The power conversion circuit includes a transformer and a rectifier circuit, wherein: The primary side of the transformer serves as the input end of the power conversion circuit and is connected to the output end of the voltage regulating circuit, and the secondary side of the transformer is connected to the input end of the rectifier circuit; The output end of the rectifier circuit serves as the output end of the power conversion circuit and is connected to the driving motor and the sampling end of the voltage detection circuit respectively.

7. The control circuit according to claim 1, wherein: Also includes: A state detection circuit, wherein the feedback terminal of the state detection circuit is connected to the controller, wherein: The state detection circuit outputs a detection signal to the controller, wherein the detection signal is output when the drive motor is stalled; When the controller receives the detection signal, the controller outputs the control signal to the voltage regulating circuit, or, After receiving the detection signal, the controller counts the duration of the stall of the drive motor, and when the duration reaches a preset duration threshold, the controller outputs the control signal to the voltage regulating circuit.

8. The control circuit according to claim 7, characterized in that: The state detection circuit includes: a current limiting resistor, a pull-up resistor and a photointerrupter, and the photointerrupter includes a light-emitting component and a light-receiving component, wherein: One end of the current limiting resistor is connected to the second power supply, and the other end of the current limiting resistor is connected to the input end of the light-emitting component; The output end of the light emitting component is grounded; One end of the pull-up resistor is connected to the second power supply, and the other end of the pull-up resistor is connected to the input end of the light receiving component; The output end of the light receiving component is grounded; The connection point between the light receiving component and the pull-up resistor serves as a feedback end of the state detection circuit and is connected to the controller.

9. The control circuit according to claim 1, wherein: The first power source includes an AC power source; The control circuit further includes: a zero-crossing detection circuit, wherein: The detection end of the zero-crossing detection circuit is connected to the first power supply, and the feedback end of the zero-crossing detection circuit is connected to the controller; The zero-crossing detection circuit detects a change in the amplitude of the output voltage of the first power supply and outputs an enable signal to the controller when the amplitude of the output voltage crosses a zero value; The control signal is generated according to the sampling voltage and the enable signal.

10. The control circuit according to claim 9, characterized in that: The zero-crossing detection circuit includes: a second photoelectric coupler and a first detection resistor, wherein: The input end of the second photoelectric coupler serves as the detection end of the zero-crossing detection circuit and is connected to the first power supply. The first output end of the second photoelectric coupler is connected to one end of the first detection resistor. The second output end of the second photoelectric coupler is grounded. The other end of the first detection resistor is connected to a second power supply; The connection point between the second photoelectric coupler and the first detection resistor serves as a feedback end of the zero-crossing detection circuit and is connected to the controller.

11. The control circuit according to any one of claims 1 to 10, characterized in that: Also includes: Motor control circuit, where The motor control circuit is connected between the power conversion circuit and the drive motor; The controller is connected to the control end of the motor control circuit, and the controller controls the operating state of the drive motor through the motor control circuit.

12. A beverage machine, characterized in that: include: A driving motor, a brewing device, and a control circuit of a beverage machine according to any one of claims 1 to 11, wherein the driving motor is drivingly connected to the brewing device.

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