Coffee maker and brew head control circuit

Abstract

The application relates to a coffee machine and a control circuit of a brewing head, the control circuit comprising a master control unit, a motor control module, a current detection module and a step detection module, the number of rotations of a brewing head motor is detected through the step detection module to determine the number of steps of the brewing head, the current of the brewing head motor is detected through the current detection module, a detection voltage corresponding to the current is generated, and in the process of driving the brewing head motor to rotate forward or reverse through the motor control module controlled by the master control unit, if the number of steps detected by the step detection module reaches a preset number of steps, the brewing head motor is correspondingly driven to rotate at a reduced speed through the master control unit controlling the motor control module, and when the detection voltage is a set voltage, the motor control module is controlled to drive the brewing head motor to stop rotating, and through the application, the problems that the coffee machine cannot accurately control the position of the brewing head, the brewing head is easy to be damaged and the utilization rate of coffee powder is low in the related art are solved.

Description

Technical Field

[0001] This application relates to the field of coffee machine technology, and more particularly to a coffee machine and brewing head control circuit. Background Technology

[0002] In related technologies, coffee machines control the position of the brewing head during brewing by using a step feedback mechanism. This means that the position of the brewing head is determined by detecting the number of steps taken by the brewing head (using a set detection sensor, such as an infrared sensor, to detect the number of rotations of the brewing head motor). However, using the step count to determine and control the position of the brewing head cannot determine whether the brewing head has been fully depressed. Furthermore, in related technologies, detecting whether the brewing head has been fully depressed is achieved by detecting the current of the brewing head motor. However, existing methods use a resistor in series to detect the current, resulting in large errors in the detected current. Consequently, if the brewing head is not stopped in time when it has fully depressed, it can easily damage the brewing head or cause it to not fully depress the coffee grounds.

[0003] Currently, no effective solution has been proposed for the problems in related technologies, such as the inability of coffee machines to accurately control the position of the brewing head, the easy damage of the brewing head, and the low utilization rate of coffee powder. Utility Model Content

[0004] In view of this, it is necessary to provide a coffee machine and brewing head control circuit to at least solve the problems in the related technology that the coffee machine cannot accurately control the position of the brewing head, the brewing head is easily damaged, and the coffee powder utilization rate is low.

[0005] In a first aspect, this application provides a technical solution as follows: a brewing head control circuit, including a main control unit, a motor control module, a current detection module, and a step detection module. The motor control module is electrically connected to the main control unit, the current detection module, and the brewing head motor, respectively. The current detection module is also electrically connected to the main control unit. The step detection module is electrically connected to the brewing head motor and the main control unit, respectively. The step detection module is used to detect the number of rotations of the brewing head motor to determine the number of steps for the brewing head. The current detection module is used to detect the current of the brewing head motor and generate a detection voltage corresponding to the current. During the process where the main control unit controls the motor control module to drive the brewing head motor to rotate forward or backward, when the number of steps detected by the step detection module reaches a preset number, the main control unit controls the motor control module to drive the brewing head motor to decelerate accordingly, and when the detection voltage is a set voltage, controls the motor control module to drive the brewing head motor to stop rotating.

[0006] Secondly, embodiments of this application also provide a coffee machine, including a brewer and a control circuit for controlling the operation of the brewer, wherein the control circuit is the brewing head control circuit described in the first aspect.

[0007] Compared with related technologies, this embodiment provides a coffee machine and brewing head control circuit. The control circuit includes a main control unit, a motor control module, a current detection module, and a step detection module. The motor control module is electrically connected to the main control unit, the current detection module, and the brewing head motor. The current detection module is also electrically connected to the main control unit. The step detection module is electrically connected to the brewing head motor and the main control unit. The step detection module detects the number of rotations of the brewing head motor to determine the number of steps. The current detection module detects the current of the brewing head motor and generates a detection voltage corresponding to the current. The circuit also employs... During the process of the main control unit controlling the motor control module to drive the brewing head motor to rotate forward or backward, if the step count detection module detects that the number of steps has reached a preset number, the main control unit controls the motor control module to drive the brewing head motor to decelerate accordingly. When the detected voltage is the set voltage, the main control unit controls the motor control module to drive the brewing head motor to stop rotating. This solves the problems in related technologies where coffee machines cannot accurately control the position of the brewing head, the brewing head is easily damaged, and the coffee powder utilization rate is low. By adopting a dual detection method of brewing head step count and motor circuit, it achieves the beneficial effects of ensuring that the brewing head is pressed to the bottom without being damaged, improving the coffee powder utilization rate, and improving the coffee machine's performance.

[0008] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0009] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A structural block diagram of a control circuit for a brewing head provided in an embodiment of this application; Figure 2 This is a topology diagram of the main control unit and power module in an embodiment of this application; Figure 3This is a topology diagram of the motor control module and the current detection module in an embodiment of this application; Figure 4 This is a topology diagram of the step detection module in an embodiment of this application. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] The coffee machine and brewing head control circuit of this application will be described below with reference to the accompanying drawings in the embodiments of this application and through specific embodiments.

[0014] refer to Figures 1 to 4 The control circuit for the brewing head provided in this application embodiment is used to control the position of the coffee machine brewing head. It includes a main control unit 100, a motor control module 200, a current detection module 300, and a step detection module 400. The motor control module 200 is electrically connected to the main control unit 100, the current detection module 300, and the brewing head motor 001. The current detection module 300 is also electrically connected to the main control unit 100. The step detection module 400 is electrically connected to the brewing head motor 001 and the main control unit 100. The step count detection module 400 is used to detect the number of rotations of the brewing head motor 001 to determine the number of steps of the brewing head.

[0015] In this embodiment, the step detection module 400 uses a step detection sensor (e.g., an infrared sensor) to measure the number of rotations of the brewing head motor 001 and compares it with the number of rotations detected during the previous operation of the coffee machine to determine the change in the number of rotations, thereby determining the number of steps of the brewing head and roughly determining the position where the brewing head moves towards or away from the bottom. Thus, by determining the number of steps of the brewing head, the timing of the corresponding brewing operation (brewing or ending brewing) amplitude that slows down the brewing head can be determined, that is, the timing of the brewing head motor 001 decelerating in forward or reverse rotation can be determined. In this embodiment, when it is determined that the brewing head motor 001 is rotating in forward or reverse rotation, before the number of rotations of the brewing head motor 001 is detected to reach the preset number of steps, the rotation amplitude of the brewing head motor 001 is controlled to accelerate the rotation and move the brewing head motor 001. When the number of rotations of the brewing head motor 001 is detected to reach the preset number of steps, the rotation amplitude of the brewing head motor 001 is reduced, thereby slowing down the brewing head motor 001.

[0016] The current detection module 300 is used to detect the current of the brewing head motor 001 and generate a detection voltage corresponding to the current.

[0017] In this embodiment, when the brewing head reaches a preset number of steps, it is assumed to be in a set position. However, this position does not necessarily mean the brewing head has been fully depressed. If the brewing head were to stop moving at this point, the coffee liquid would not be fully dispensed, resulting in waste. In this embodiment, the speed of the brewing head motor 001 is reduced to slow down the movement of the brewing head, allowing it to move slowly and fully depressed. During this process, the current of the brewing head motor 001 is reduced to a set value. Therefore, in this embodiment, the current during the deceleration process of the brewing head motor 001 is detected. When the current reaches the set value, the brewing head is considered to have reached its final position. The position, or pressing to the bottom, is determined by decelerating the movement and detecting the corresponding motor current to ensure that the brewing head finally decelerates and presses to the bottom. In this embodiment, a corresponding current detection chip is used to accurately detect the current of the brewing head motor 001. Simultaneously, the current detected by the current detection chip is converted into a corresponding detection voltage and transmitted to the main control unit 100, thereby enabling the main control unit 100 to obtain the detection voltage of the corresponding current and complete the current detection of the brewing head motor 001. It can be understood that in this embodiment, a current detection chip is used to detect the current and output a corresponding detection voltage to achieve accurate current detection, providing detection data for position control of the brewing head motor 001.

[0018] During the process of the main control unit 100 controlling the motor control module 200 to drive the brewing head motor 001 to rotate forward or in reverse, when the number of steps detected by the step detection module 400 reaches the preset number of steps, the main control unit 100 controls the motor control module 200 to drive the brewing head motor 001 to decelerate accordingly, and when the detected voltage is the set voltage, the main control unit 100 controls the motor control module 200 to drive the brewing head motor 001 to stop rotating.

[0019] In this embodiment, when the main control unit 100 receives a brewing switch signal, if the detected number of steps of the brewing head and the current of the brewing head motor 001 do not reach the set value, the main control unit 100 drives the brewing head motor 001 to rotate forward through the motor control module 200, causing the brewing head to move rapidly. Subsequently, the current of the brewing head motor 001 is detected by the current detection module 300 (using a detection voltage to represent the corresponding current). When the detection voltage corresponding to the current reaches the set value, the main control unit 100 controls the brewing head motor 001 to stop working through the motor control module 200 and begins brewing coffee. After brewing coffee, the brewing head needs to return to its initial position. At this time, the main control unit 100... The brewing head motor 001 is driven to reverse by the motor control module 200, causing the brewing head to move quickly and then retract. After the brewing head has moved back and reached a set number of steps, the main control unit 100 drives the brewing head motor 001 to decelerate and reverse, causing the brewing head to move slowly. The current of the brewing head motor 001 is detected by the current detection module 300. When the detection voltage corresponding to the current reaches a set value, the main control unit 100 controls the brewing head motor 001 to stop reversing, and the brewing head stops working. It can be understood that the moment the brewing head motor 001 stops rotating indicates that the brewing head has reached the bottom or returned to its initial position.

[0020] In this embodiment, the main control unit 100 can be a microcontroller (MCU), a digital signal processor (DSP), or a programmable logic device (FPGA). In some optional embodiments, the main control unit 100 preferably uses one of the following MCUs: R7F0C908B2 microprocessor, STC15F204 microcontroller, AT89S52 microcontroller, or EN8F677E microprocessor, with the R7F0C908B2 microprocessor being the most preferred. Figure 2 U11 in the middle.

[0021] The aforementioned brewing head control circuit uses a step detection module 400 to detect the number of rotations of the brewing head motor 001 to determine the number of steps. A current detection module 300 detects the current of the brewing head motor 001 and generates a corresponding detection voltage. Furthermore, during the process of the main control unit 100 controlling the motor control module 200 to drive the brewing head motor 001 in forward or reverse rotation, if the step count detected by the step detection module 400 reaches a preset number of steps, the main control unit 100 controls the motor control module 200 to drive the brewing head motor 001 to decelerate accordingly. When the detected voltage is the set voltage, the motor control module 200 stops the brewing head motor 001 from rotating. This solves the problems in related technologies where coffee machines cannot accurately control the brewing head position, the brewing head is easily damaged, and the coffee powder utilization rate is low. By employing a dual detection method of brewing head steps and motor circuit, it achieves the beneficial effects of ensuring the brewing head is pressed to the bottom without damage, improving coffee powder utilization, and enhancing the overall performance of the coffee machine.

[0022] To control the forward, reverse, and stop functions of the brewing head motor 001, in some embodiments, reference is made to... Figures 1 to 3 The motor control module 200 includes a motor forward rotation switch circuit 21, a motor reverse rotation switch circuit 22, and a stop switch circuit 23. The motor forward rotation switch circuit 21 includes a first input terminal, a second input terminal, a first control terminal, and a first output terminal. The motor reverse rotation switch circuit 22 includes a third input terminal, a fourth input terminal, a second control terminal, and a second output terminal. The first and third input terminals are electrically connected to a first positive power supply (corresponding to AC-DC 24V), and the second and fourth input terminals are electrically connected to a first negative power supply (corresponding to RGND) and the output terminal of the stop switch circuit 23. Both the first and second control terminals are electrically connected to the main control unit 100 (see reference). Figure 3 The network labels Motortr1 and Motortr2 are used to connect the first output terminal to the brewing head motor 001. Figure 3 The first electrode (corresponding to P9 1) of the circuit is connected to the connection terminal P9. The second output terminal is electrically connected to the second electrode (corresponding to P9 2) of the brewing head motor 001. The controlled terminal of the stop switch circuit 23 is electrically connected to the main control unit 100 (see reference). Figure 3 The network label Moff in the middle), where, The main control unit 100 is used to generate forward control signals, reverse control signals and stop control signals.

[0023] The motor forward rotation switch circuit 21 is used to control one of the first output terminal, the first input terminal, and the second output terminal to be connected according to the level of the forward rotation control signal received by the first control terminal.

[0024] The motor reversing switch circuit 22 is used to control one of the second output terminal, the third input terminal, and the fourth input terminal to be connected according to the level of the reversing control signal received by the second control terminal.

[0025] In this embodiment, when the motor forward rotation switch circuit 21 receives a forward rotation control signal with a preset high level, the first output terminal of the motor forward rotation switch circuit 21 is connected to the first input terminal. At this time, the first output terminal is connected to AC-DC 24V, that is, pin 1 of P9 is connected to AC-DC 24V. It can be understood that at this time, the motor reverse rotation switch circuit 22 will receive a reverse rotation control signal with a low level, and the second output terminal is connected to the fourth input terminal. At this time, the second output terminal is connected to RGND, thus the brewing head motor 001 rotates forward. When the motor forward rotation switch circuit 21 receives a forward rotation control signal with a preset low level, the first output terminal of the motor forward rotation switch circuit 21 is connected to the second input terminal. At this time, the first output terminal is connected to RGND, that is, pin 1 of P9 is connected to RGND. At this time, the motor reverse rotation switch circuit 22 will receive a reverse rotation control signal with a high level, and the second output terminal is connected to the third input terminal. At this time, the second output terminal is connected to AC-DC 24V, thus the brewing head motor 001 rotates in reverse.

[0026] The stop switch circuit 23 is used to convert the received stop control signal into a corresponding enable voltage and output it through the output terminal of the stop switch circuit 23.

[0027] In this embodiment, when the stop switch circuit 23 receives the stop control signal sent by the main control unit 100, it converts the level of the stop control signal into a corresponding enable voltage (high voltage) and applies the enable voltage to the second electrode of the forward-rotating brewing head motor 001. At this time, both the first and second electrodes of the brewing head motor are at a high level, and the brewing head motor 001 cannot work and stops rotating; or the enable voltage is applied to the first electrode of the reverse-rotating brewing head motor. At this time, both the first and second electrodes of the brewing head motor are also at a high level, and the brewing head motor 001 cannot work and stops rotating.

[0028] When the motor forward switch circuit 21 controls the first output terminal to connect with the first input terminal and the motor reverse switch circuit controls the second output terminal to connect with the fourth output terminal, the brewing head motor 001 rotates forward; when the motor forward switch circuit 21 controls the first output terminal to connect with the second input terminal and the motor reverse switch circuit 22 controls the second output terminal to connect with the third input terminal, the brewing head motor 001 rotates in reverse; when the enable voltage output by the stop switch circuit 23 is at a preset level, the brewing head motor 001, whether rotating forward or in reverse, stops rotating.

[0029] In some of these alternative implementations, refer to Figure 3Both the motor forward rotation switch circuit 21 and the motor reverse rotation switch circuit 22 include a first controlled switch (see reference). Figure 3 The first controlled switch includes a first port, a second port, a third port, a fourth port, and a fifth port. The first port is electrically connected to a third power supply. The second port is electrically connected to the output terminal of the first drive circuit. The input terminal of the first drive circuit is connected to either the first or second control terminal. The third port is connected to either the first or second output terminal. The fourth port is connected to either the first or third input terminal. The fifth port is connected to either the second or fourth input terminal. The first driving circuit is used to convert the forward rotation control signal or the reverse rotation control signal into the corresponding controlled signal.

[0030] In this embodiment, reference Figure 3 The first driving circuit includes a first switching transistor (reference). Figure 3 Q14 and Q17 in the first transistor), the controlled terminal of the first switching transistor is electrically connected to the first resistor (reference). Figure 3 R47 and R56 in the reference) and the first pull-down resistor (reference) Figure 3 (R49 and R59 in the first resistor), the other end of the first resistor is electrically connected to the main control unit 100 (refer to R49 and R59 in the second resistor). Figure 3 In the network labels Motortr1 and Motortr2, the other end of the first pull-down resistor is connected to ground GND, the input terminal of the first switch is connected to the output terminal of the first drive circuit, and the output terminal of the first switch is connected to ground. The first switch is used to control the on / off state of the input and output terminals of the first switch according to the level of the forward or reverse control signal received at the input terminal of the first switch, so as to convert the forward or reverse control signal into the corresponding controlled signal.

[0031] It should be noted that the first switching transistor in the embodiments of this application includes, but is not limited to, transistors, MOSFETs, and field-effect transistors. Furthermore, based on the disclosure of this application, those skilled in the art will readily conceive of modifying the first switching transistor disclosed in this application into a first driving circuit adapted to the specific selection of the switching transistor. Therefore, this application can be implemented regardless of whether the switching transistor is an NPN or PNP transistor, an N-channel or P-channel switching MOSFET, or an N-type or P-type field-effect transistor; no limitation is made in the embodiments of this application. In some optional embodiments, the first switching transistor is preferably an NPN transistor.

[0032] In this embodiment, the first controlled switch (reference) Figure 3K1 and K2 in the circuit are used to control one of the third, fourth and fifth ports to be connected according to the level of the controlled signal received at the second port, so that the motor forward switch circuit 21 controls one of the first output terminal to be connected to one of the first input terminal and the second output terminal, or the motor reverse switch circuit 22 controls one of the second output terminal to be connected to one of the third input terminal and the fourth output terminal.

[0033] In this embodiment, the first controlled switch includes a single-pole double-throw relay.

[0034] To stop the brewing head motor 001 from operating, in some alternative implementations, refer to Figure 3 The shutdown switch circuit 23 includes a second drive circuit and a second controlled switch. The second controlled switch includes a first controlled port, a first input port, and a first output port. The input terminal of the second drive circuit is connected to the controlled terminal of the shutdown switch circuit 23, and the output terminal of the second drive circuit is electrically connected to the first controlled port. The first input port is connected to the output terminal of the shutdown switch circuit 23, and the first output port is pulled down to ground through a series current detection module 300. The second drive circuit is used to convert the shutdown control signal into the first control signal.

[0035] The second controlled switch is used to control the on / off state of the first input port and the first output port according to the level of the first control signal received by the first controlled port, so as to generate a corresponding enable voltage at the first input port.

[0036] In this embodiment, the second controlled switch is a controlled switch transistor (reference). Figure 3 (Q16 in the text).

[0037] In some preferred embodiments, the second driving circuit includes a second switch Q15 and an optocoupler UG1. The controlled terminal of the second switch Q15 is electrically coupled to the main control unit 100 via a series third resistor R52 (see reference). Figure 3 In the network (Moff), the output of the second switch Q15 is grounded, the input of the second switch Q15 is electrically connected to the cathode of the light emitter of the optocoupler UG1, the anode of the light emitter of the optocoupler UG1 is connected in series with the fourth resistor R54 and electrically connected to the third power supply (corresponding to 5V), and the emitter of the light receiver of the optocoupler UG1 is connected in series with the fifth resistor R53 and electrically connected to the first controlled port. In this embodiment, the optocoupler UG1 includes one of the following: TL431 model optocoupler, PC817 model optocoupler, or TLP521 model optocoupler.

[0038] The second switch Q15 is used to control the on / off state of the input and output terminals of the second switch Q15 according to the level of the shutdown control signal received at the controlled terminal of the second switch Q15.

[0039] In this embodiment, when the level of the shutdown control signal is a preset high level, the input and output terminals of the second switch Q15 are connected; when the level of the shutdown control signal is a preset low level, the input and output terminals of the second switch Q15 are disconnected.

[0040] When the input and output terminals of the second switch Q15 are connected, the light emitter of the optocoupler UG1 emits light, so that the light receiver of the optocoupler UG1 generates a first control signal with a preset high level. When the input and output terminals of the second switch Q15 are disconnected, the light receiver of the optocoupler UG1 generates a first control signal with a preset low level.

[0041] Second controlled switch (reference) Figure 3 Q16 in the first control port is used to control the first input port to connect with the first output port when the first controlled port receives a first control signal with a preset high level, so as to generate a low-level enable voltage at the first input port; and is used to control the first input port to disconnect from the first output port when the first controlled port receives a first control signal with a preset low level, so as to generate a high-level enable voltage at the first input port.

[0042] The second switch Q15 and the controlled switch Q16 in the embodiments of this application include, but are not limited to, transistors, MOSFETs, and field-effect transistors. Furthermore, based on the disclosure of this application, those skilled in the art will readily conceive of modifying the second switch and the controlled switch disclosed in this application into a shutdown switch circuit adapted to the specific selection of the switch. Therefore, this application can be implemented regardless of whether the switch is an NPN or PNP transistor, an N-channel or P-channel switching MOSFET, or an N-type or P-type field-effect transistor; no limitation is made in the embodiments of this application. In some optional embodiments, the second switch Q15 is preferably an NPN transistor, and the controlled switch Q16 is preferably a MOSFET.

[0043] To achieve the detection of motor current, refer to Figure 3 In some embodiments, the current detection module 300 includes a current detection chip U5, and the positive current detection port of the current detection chip U5 (reference) Figure 3 The IP+ pin of the U5 chip is electrically connected to the first output port, and the negative current detection port of the current detection chip U5 (refer to...) Figure 3 The IP pin of U5 is connected to ground, and the detection voltage output port of the current detection chip U5 is connected to the reference pin. Figure 3 The OUT pin of U5 is electrically connected to the main control unit 100 through a series coupling resistor R58. The current detection chip U5 is used to detect the current output along the first output port, so as to output a detection voltage representing the current of the brewing head motor 001 along the detection voltage output port.

[0044] In some of the alternative implementations, the current sensing chip U5 includes, but is not limited to, one of the following: RSA4081 current sensing chip, OC5266 current sensing chip, SGM8199 current sensing chip, CC6903SO current sensing chip, preferably CC6903SO current sensing chip.

[0045] To achieve step count detection of the brewing head, refer to Figure 1 and Figure 4 In some embodiments, the step count detection module 400 includes a brewer step count detection sensor ( Figure 4 (Represented by P10), third switch Q12, and fourth switch Q11. The control terminal of the brewing step detection sensor is electrically connected to the input terminal of the third switch Q12. The output terminal of the third switch Q12 is electrically connected to the fourth power supply (corresponding to +3.3V). The controlled terminal of the third switch Q12 is electrically connected to the input terminal of the fourth switch Q11. The output terminal of the fourth switch Q11 is grounded. The controlled terminal of the fourth switch Q11 is electrically coupled to the main control unit 100 through a series sixth resistor R43 (reference). Figure 4 The network label BrewFb_EN in the reference (refer to the feedback port of the brewer step count sensor). Figure 4 Pin 2 of P10 is also electrically coupled to the main control unit 100 via the seventh resistor R45 (see reference). Figure 4 The network label BrewFb in the text, where, The main control unit 100 is used to generate the first enable control signal.

[0046] The fourth switch Q11 is used to control the on / off state of the input and output terminals of the fourth switch Q11 according to the level of the first enable control signal received by the controlled terminal of the fourth switch Q11.

[0047] The third switch Q12 is used to control the connection between the input and output terminals of the third switch Q12 when the input and output terminals of the fourth switch Q11 are connected, and to control the connection between the input and output terminals of the third switch Q12 when the input and output terminals of the fourth switch Q11 are connected.

[0048] The brewer step count detection sensor is used to start and stop the corresponding operation according to the on / off state of the input and output terminals of the third switch Q12, so as to output the feedback voltage representing the number of rotations of the brewing head motor 001 through the feedback port of the brewer step count detection sensor to the main control unit 100.

[0049] In this embodiment, when the input and output terminals of the third switch Q12 are connected, the brewer step count detection sensor is powered on and starts working; when the input and output terminals of the third switch Q12 are disconnected, the brewer step count detection sensor is powered off and stops working. In this embodiment, when the brewer step count detection sensor starts working, it detects the feedback voltage representing the number of rotations of the brewing head motor 001 and outputs it to the main control unit 100 along the feedback port of the brewer step count detection sensor.

[0050] It is understood that the third and fourth switching transistors in the embodiments of this application include, but are not limited to, transistors, MOSFETs, and field-effect transistors. Furthermore, based on the disclosures in this application, those skilled in the art will readily conceive of modifying the third and fourth switching transistors disclosed in this application to a step detection module adapted to the specific selection of the switching transistors. Therefore, this application can be implemented regardless of whether the switching transistor is an NPN or PNP transistor, an N-channel or P-channel switching MOSFET, or an N-type or P-type field-effect transistor, and is not limited in the embodiments of this application.

[0051] It should be noted that the control circuit of this application also includes a corresponding power supply module, see reference. Figure 2 The power module is connected to an external transformer and converts the voltage provided by the external transformer to AC-DC 24V. At the same time, the power module also converts AC-DC 24V to the voltages corresponding to the third and fourth power supplies. The corresponding conversion circuits can adopt relevant conversion circuits in the prior art, which are not limited here.

[0052] This application also provides a coffee machine, including a brewer and a control circuit for controlling the operation of the brewer, wherein the control circuit is the brewing head control circuit in the above embodiment.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive elements that are not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A brewing head control circuit for controlling the position of a coffee machine brewing head, characterized in that, The system includes a main control unit (100), a motor control module (200), a current detection module (300), and a step detection module (400). The motor control module (200) is electrically connected to the main control unit (100), the current detection module (300), and the brewing head motor (001). The current detection module (300) is also electrically connected to the main control unit (100). The step detection module (400) is electrically connected to the brewing head motor (001) and the main control unit (100). The step detection module (400) is used to detect the number of rotations of the brewing head motor (001) to determine the number of steps of the brewing head; The current detection module (300) is used to detect the current of the brewing head motor (001) and generate a detection voltage corresponding to the current; During the process of the main control unit (100) controlling the motor control module (200) to drive the brewing head motor (001) to rotate forward or in reverse, when the number of steps detected by the step detection module (400) reaches the preset number of steps, the main control unit (100) also controls the motor control module (200) to drive the brewing head motor (001) to decelerate accordingly, and when the detected voltage is the set voltage, the main control unit (100) controls the motor control module (200) to drive the brewing head motor (001) to stop rotating.

2. The brewing head control circuit according to claim 1, characterized in that, The motor control module (200) includes a motor forward rotation switch circuit (21), a motor reverse rotation switch circuit (22), and a stop switch circuit (23). The motor forward rotation switch circuit (21) includes a first input terminal, a second input terminal, a first control terminal, and a first output terminal. The motor reverse rotation switch circuit (22) includes a third input terminal, a fourth input terminal, a second control terminal, and a second output terminal. The first input terminal and the third input terminal are electrically connected to a first positive power supply. The second input terminal and the fourth input terminal are electrically connected to a first negative power supply and the output terminal of the stop switch circuit (23). The first control terminal and the second control terminal are both electrically connected to the main control unit (100). The first output terminal is electrically connected to the first electrode of the brewing head motor (001), and the second output terminal is electrically connected to the second electrode of the brewing head motor (001). The controlled terminal of the stop switch circuit (23) is electrically connected to the main control unit (100). The main control unit (100) is used to generate forward rotation control signal, reverse rotation control signal and stop control signal respectively; The motor forward rotation switch circuit (21) is used to control one of the first output terminal and the first input terminal and the second output terminal to be connected according to the level of the forward rotation control signal received by the first control terminal; The motor reversing switch circuit (22) is used to control one of the second output terminal, the third input terminal, and the fourth input terminal to be connected according to the level of the reversing control signal received by the second control terminal. The shutdown switch circuit (23) is used to convert the received shutdown control signal into a corresponding enable voltage and output it along the output terminal of the shutdown switch circuit (23); When the motor forward rotation switch circuit (21) controls the first output terminal to connect with the first input terminal and the motor reverse rotation switch circuit (22) controls the second output terminal to connect with the fourth input terminal, the brewing head motor (001) rotates forward; when the motor forward rotation switch circuit (21) controls the first output terminal to connect with the second input terminal and the motor reverse rotation switch circuit (22) controls the second output terminal to connect with the third input terminal, the brewing head motor (001) rotates in reverse; when the enable voltage output by the stop switch circuit (23) is at a preset level, the brewing head motor (001) rotating in either forward or reverse direction stops rotating.

3. The brewing head control circuit according to claim 2, characterized in that, Both the motor forward rotation switch circuit (21) and the motor reverse rotation switch circuit (22) include a first controlled switch and a first drive circuit. The first controlled switch includes a first port, a second port, a third port, a fourth port, and a fifth port. The first port is electrically connected to a third power supply, the second port is electrically connected to the output terminal of the first drive circuit, the input terminal of the first drive circuit is connected to the first control terminal or the second control terminal, the third port is connected to the first output terminal or the second output terminal, the fourth port is connected to the first input terminal or the third input terminal, and the fifth port is connected to the second input terminal or the fourth input terminal. The first driving circuit is used to convert the forward control signal or the reverse control signal into a corresponding controlled signal; The first controlled switch is used to control the level of the controlled signal received at the second port to connect the third port to one of the fourth port and the fifth port, so that the motor forward switch circuit (21) controls the first output terminal to connect to one of the first input terminal and the second output terminal, or the motor reverse switch circuit (22) controls the second output terminal to connect to one of the third input terminal and the fourth input terminal.

4. The brewing head control circuit according to claim 3, characterized in that, The first controlled switch includes a single-pole double-throw relay; The first driving circuit includes a first switching transistor. The controlled terminal of the first switching transistor is electrically connected to a first resistor and a first pull-down resistor. The other end of the first resistor is electrically connected to the main control unit (100). The other end of the first pull-down resistor is grounded. The input terminal of the first switching transistor is connected to the output terminal of the first driving circuit. The output terminal of the first switching transistor is grounded. The first switching transistor is used to control the on / off state of the input terminal and the output terminal of the first switching transistor according to the level of the forward control signal or the reverse control signal received by the input terminal of the first switching transistor, so as to convert the forward control signal or the reverse control signal into the corresponding controlled signal.

5. The brewing head control circuit according to claim 2, characterized in that, The shutdown switch circuit (23) includes a second drive circuit and a second controlled switch. The second controlled switch includes a first controlled port, a first input port, and a first output port. The input terminal of the second drive circuit is connected to the controlled terminal of the shutdown switch circuit (23), and the output terminal of the second drive circuit is electrically connected to the first controlled port. The first input port is connected to the output terminal of the shutdown switch circuit (23), and the first output port is pulled down to ground through the current detection module (300) connected in series. The second driving circuit is used to convert the shutdown control signal into a first control signal; The second controlled switch is used to control the on / off state of the first input port and the first output port according to the level of the first control signal received by the first controlled port, so as to generate the corresponding enable voltage at the first input port.

6. The brewing head control circuit according to claim 5, characterized in that, The second controlled switch is a controlled switch transistor, and / or, The second driving circuit includes a second switching transistor and an optocoupler. The controlled terminal of the second switching transistor is electrically connected to the main control unit (100) via a series third resistor. The output terminal of the second switching transistor is grounded. The input terminal of the second switching transistor is electrically connected to the cathode of the light emitter of the optocoupler. The anode of the light emitter of the optocoupler is electrically connected to a third power supply via a series fourth resistor. The emitter of the light receiver of the optocoupler is electrically connected to the first controlled port via a series fifth resistor. The second switching transistor is used to control the on / off state of the input and output terminals of the second switching transistor according to the level of the shutdown control signal received by the controlled terminal of the second switching transistor; When the input and output terminals of the second switch are connected, the light emitter of the optocoupler emits light, so that the light receiver of the optocoupler generates a first control signal with a preset high level; and when the input and output terminals of the second switch are disconnected, the light receiver of the optocoupler generates a first control signal with a preset low level. The second controlled switch is configured to control the first input port to connect with the first output port when the first controlled port receives a preset high-level first control signal, so as to generate a low-level enable voltage at the first input port; and to control the first input port to disconnect from the first output port when the first controlled port receives a preset low-level first control signal, so as to generate a high-level enable voltage at the first input port.

7. The brewing head control circuit according to claim 5, characterized in that, The current detection module (300) includes a current detection chip. The positive current detection port of the current detection chip is electrically connected to the first output port, and the negative current detection port of the current detection chip is grounded. The detection voltage output port of the current detection chip is coupled to the main control unit (100) through a series coupling resistor. The current detection chip is used to detect the current output along the first output port so as to output the detection voltage representing the current of the brewing head motor (001) along the detection voltage output port.

8. The brewing head control circuit according to claim 7, characterized in that, The current detection chip includes one of the following: RSA4081 current detection chip, OC5266 current detection chip, SGM8199 current detection chip, or CC6903SO current detection chip.

9. The brewing head control circuit according to claim 1, characterized in that, The step counting module (400) includes a brewer step counting sensor, a third switch, and a fourth switch. The control terminal of the brewer step counting sensor is electrically connected to the input terminal of the third switch. The output terminal of the third switch is electrically connected to a fourth power supply. The controlled terminal of the third switch is electrically connected to the input terminal of the fourth switch. The output terminal of the fourth switch is grounded. The controlled terminal of the fourth switch is coupled to the main control unit (100) via a sixth resistor in series. The feedback port of the brewer step counting sensor is also coupled to the main control unit (100) via a seventh resistor. The main control unit (100) is used to generate a first enable control signal; The fourth switch is used to control the on / off state of the input and output terminals of the fourth switch according to the level of the first enable control signal received by the controlled terminal of the fourth switch. The third switch is used to control the connection between the input and output terminals of the third switch when the input and output terminals of the fourth switch are connected, and to control the connection between the input and output terminals of the third switch when the input and output terminals of the fourth switch are connected. The step count detection sensor for the brewer is used to start and stop the corresponding operation according to the on / off state of the input and output terminals of the third switch tube, so as to output the feedback voltage representing the number of rotations of the brewing head motor (001) along the feedback port of the step count detection sensor to the main control unit (100).

10. A coffee machine, comprising a brewer and a control circuit for controlling the operation of the brewer, characterized in that, The control circuit includes the brewing head control circuit according to any one of claims 1 to 9.

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