Current analysis circuit of coffee maker

Abstract

A coffee machine current analysis circuit relates to the technical field of control circuits. The circuit comprises a load circuit, a current detection circuit and a control circuit, the control circuit is connected with the control end of the load circuit, the load circuit is connected with the input end of the current detection circuit, and the output end of the current detection circuit is connected with the input end of the control circuit. The current detection circuit is used for detecting a current instantaneous value of the load circuit. According to the embodiment of the utility model, through the combination of the load circuit, the current detection circuit and the control circuit, the running state of the motor of the coffee machine is monitored, the motor is prevented from being overheated and damaged, the service life of the coffee machine is prolonged, the diffusion of mechanical faults is also avoided, and the maintenance cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, and particularly relates to a current analysis circuit for a coffee machine. Background Art

[0002] Coffee machines have become one of the indispensable devices in modern families and offices. With the accelerating pace of people's lives, the demand for fast and convenient coffee solutions has increased, and the popularity of coffee machines has increased significantly.

[0003] However, in the current coffee machines, when the motor is blocked or idling during the bean grinding state, the coffee machine often cannot automatically detect and stop the motor, which not only wastes energy, but also may cause the motor to overheat and be damaged, thus shortening the service life of the coffee machine. At the same time, the abnormal operation of the motor may also cause more extensive mechanical failures and increase the maintenance cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a current analysis circuit for a coffee machine in view of the defects and deficiencies of the prior art. On the one hand, it is characterized in that it includes a load circuit, a current detection circuit and a control circuit. The current sampling output end of the load circuit is connected to the input end of the current detection circuit, the output end of the current detection circuit is connected to the current sampling input end of the control circuit, and the control end of the control circuit is connected to the controlled end of the load circuit. The control circuit is used to send a stop working signal to the load circuit.

[0005] The current detection circuit further includes a rectification module, a voltage division sampling module and a high-frequency filtering module. The load circuit is connected to the input end of the rectification module, the output end of the rectification module is connected to the input end of the voltage division sampling module, the output end of the voltage division sampling module is connected to the input end of the high-frequency filtering module, and the output end of the high-frequency filtering module is connected to the output port MOTOAD.

[0006] The rectification module includes an inductor T2, a rectifier DB2, a resistor R14, a capacitor C4 and a capacitor EC5. The voltage division sampling module includes a resistor R13 and a resistor R15. The high-frequency filtering module includes a resistor RJ2, a capacitor C5, a capacitor EC6 and an output port MOTOAD, where:

[0007] The mutual inductor T2 has mutual inductance ports 1, 2, 3, and 4. The mutual inductance port 1 is connected to the live wire, the mutual inductance port 3 is connected to the load circuit, the mutual inductance port 2 is connected to the input end of the rectifier DB2 and one end of the capacitor C4, the other end of the capacitor C4 is connected to the mutual inductance port 4 and the other input end of the rectifier DB2. The positive output end of the rectifier DB2 is connected to one end of the capacitor EC5, one end of the resistor R13, and one end of the resistor R14. The negative output end of the rectifier DB2 is connected to one end of the resistor R15, one end of the capacitor EC6, and one end of the capacitor C5. The negative output end of the rectifier DB2 is also connected to the other ends of the capacitor EC5 and the resistor R14. The other end of the resistor R13 is connected to one end of the resistor RJ2. The other end of the resistor R13 is also connected to the other ends of the capacitor EC6, the capacitor C5, and the resistor R15. The other end of the resistor RJ2 is connected to the other end of the C5 and the output port MOTOAD.

[0008] The control circuit further includes a main control chip, which includes a first port and a second port. The main control chip is connected to the output end of the current detection circuit through the first port, and is connected to the control end of the load circuit through the second port. The main control chip is further provided with a preset current threshold.

[0009] Wherein, the main control chip sends a stop working signal to the load circuit through the second port.

[0010] The load circuit includes a motor control sub-circuit, a motor drive sub-circuit, and a relay. The second port is connected to the input end of the motor control sub-circuit. The output end of the motor control sub-circuit is connected to the normally closed contact of the relay. One end of the normally open contact of the relay is connected to the live wire, and the other end is connected to the mutual inductance port 1. The mutual inductance port 3 is connected to the input end of the motor drive sub-circuit.

[0011] The motor control sub-circuit includes a resistor R17, a resistor R18, a triode Q1, and a diode D4, where:

[0012] One end of the resistor R17 is connected to the output port MOTOAD. The other end of the resistor R17 is connected to one end of the resistor R18 and the base of the triode Q1. The other end of the resistor R18 is connected to the emitter of the triode Q1 and GND. The collector of the triode Q1 is connected to one end of the diode D4 and the normally closed contact of the relay. The other end of the diode D4 is connected to the other normally closed contact of the relay.

[0013] The motor drive sub-circuit includes a rectifier DB3, an inductor L3, a varistor ZR2, a fuse P1, a capacitor C7, a capacitor C8, and a motor port CN2, where:

[0014] The motor port CN2, the varistor ZR2, and the capacitor C7 are connected in parallel with each other. Both ends of the capacitor C7 are connected to the inductor L3. The inductor L3 is connected in parallel with the capacitor C8. One end of the capacitor C8 is connected to the negative output terminal of the rectifier DB3, and the other end of the capacitor C8 is connected to one end of the fuse P1. The other end of the fuse P1 is connected to the positive output terminal of the rectifier DB3. The input terminal of the rectifier DB3 is connected to the mutual inductance port 1, and the other input terminal of the rectifier DB3 is connected to the zero line.

[0015] It further includes a switch circuit. The switch circuit is used to provide a pre-start signal for the load circuit. The control circuit further includes a third port. The control circuit receives the pre-start signal from the switch circuit through the third port. After receiving the pre-start signal, the control circuit outputs a high level to the input terminal of the motor control sub-circuit through the third port.

[0016] It further includes a switching power supply circuit. The switching power supply circuit is used to convert 220V alternating current into 5V direct current.

[0017] On the other hand, the present invention further provides a coffee machine, including the coffee machine current analysis circuit of the above technical solution.

[0018] Through the combination of the load circuit, the current detection circuit and the control circuit in the embodiment of the present invention, the monitoring of the operating state of the coffee machine motor is realized: when the motor is blocked or idling, the current detection circuit detects the change of the instantaneous current value and transmits the signal to the control circuit, thereby stopping the operation of the motor, which not only prevents the motor from overheating and damage, extends the service life of the coffee machine, but also avoids the spread of mechanical failures and greatly reduces the maintenance cost. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a structural block diagram of a coffee machine current analysis circuit according to an embodiment of the present invention;

[0021] Figure 2 It is a circuit diagram of the current detection circuit and the load circuit according to another embodiment of the present invention;

[0022] Figure 3It is the circuit diagram of the control circuit according to another embodiment of the present utility model;

[0023] Figure 4 It is the circuit diagram of the switching power supply circuit according to another embodiment of the present utility model.

[0024] Reference numerals:

[0025] 100, control circuit;

[0026] 110, main control chip; 111, first port; 112, second port; 113, third port;

[0027] 200, load circuit; 210, motor control sub - circuit; 220, motor drive sub - circuit; 230, relay;

[0028] 300, current detection circuit; 310, rectification module; 320, voltage - dividing sampling module; 330, high - frequency filtering module;

[0029] 400, switching circuit;

[0030] 500, switching power supply circuit. Detailed implementation manners

[0031] The following further elaborates on the present utility model in conjunction with the accompanying drawings.

[0032] This specific embodiment is merely an interpretation of the present utility model and does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0035] Refer to Figure 1, a current analysis circuit for a coffee machine is proposed, which includes a load circuit 200, a current detection circuit 300 and a control circuit 100. The current sampling output end of the load circuit 200 is connected to the input end of the current detection circuit 300, the output end of the current detection circuit 300 is connected to the current sampling input end of the control circuit 100, and the control end of the control circuit (00 is connected to the controlled end of the load circuit 200. The control circuit 100 is used to send a stop working signal to the load circuit 200.

[0036] In the embodiment of the present invention, through the combination of the load circuit, the current detection circuit and the control circuit, the monitoring of the operating state of the coffee machine motor is realized: when the motor is blocked or idling, the current detection circuit detects the change of the instantaneous current value and transmits the signal to the control circuit, thereby stopping the motor operation, which not only prevents the motor from overheating and damage, extends the service life of the coffee machine, but also avoids the spread of mechanical failures and greatly reduces the maintenance cost.

[0037] As a preference rather than a limitation, the control circuit includes a microcontroller (MCU), a current detection amplifier, an analog-to-digital converter (ADC), a relay and a power management module. The power management module provides power to the entire control circuit 100. The input end of the microcontroller (MCU) is connected to the current detection circuit 300. Specifically, the current signal output by the current detection circuit 300 is amplified by the current detection amplifier and then sent to the analog-to-digital converter (ADC). The ADC converts the amplified analog signal into a digital signal and transmits it to the input end of the microcontroller. The output end of the microcontroller (MCU) is connected to the relay to control the working state of the load circuit 200. The current sampling output end of the load circuit 200 is connected to the input end of the current detection circuit 300. In this way, the current detection circuit can monitor the current change of the load circuit in real time and feedback the signal to the microcontroller. When the microcontroller receives an abnormal current signal (such as an overcurrent situation) from the current detection circuit, it will send a control signal to the relay through its output end, thereby cutting off the power supply of the load circuit 200 and stopping its operation.

[0038] Refer to Figures 2 - 4 , the present invention provides another current analysis circuit for a coffee machine. Specifically, in one possible implementation, the control circuit 100 further includes a main control chip 110. The main control chip 110 includes a first port 111 and a second port 112. The main control chip 110 is connected to the output end of the current detection circuit 300 through the first port 111, and the main control chip 110 is connected to the control end of the load circuit 200 through the second port 112. The main control chip 110 is also provided with a preset current threshold;

[0039] Among them, the main control chip 110 is used to send start / stop working signals.

[0040] The first port 111 is used to output the voltage value or current value of the current detection circuit 300.

[0041] The second port 112 is used to output a high level.

[0042] In this embodiment, the main control chip 110 is responsible for judging whether the current exceeds a preset threshold according to the output signal of the current detection circuit 300, and sending start or stop working signals accordingly, which can effectively prevent the motor from being damaged due to abnormal current, avoid unnecessary energy waste, and at the same time ensure the safety and reliability of the use process, significantly improving the user experience and the device life.

[0043] As a preference rather than a limitation, it further includes a status indication module. The status indication module is directly connected to the fourth port of the main control chip 110 and is parallel to the current detection circuit 300. The fourth port is used to receive working status information. The status indication module can display the working status of the current coffee machine (such as normal, warning, fault, etc.) according to the processing result of the main control chip 110, enabling the user to intuitively understand the operation of the device and make corresponding operation or maintenance decisions in a timely manner.

[0044] Specifically, the status indication module includes an LED display component and a logic processing unit. The LED display component includes multi-color LED lights, and each color represents a different working status. The logic processing unit is responsible for receiving the signals sent by the main control chip 110 through its port and parsing these signals to drive the corresponding color LED lights to light up. For example, when the main control chip detects normal current, it will trigger the green LED light. If the current is abnormal, it will trigger the red LED light. There is also a microprocessor inside the logic processing unit to provide more accurate status indication. In this way, the status indication module not only enhances the interactivity of the system, but also provides real-time and intuitive reference information for the fault diagnosis and preventive maintenance of the device, thus greatly improving the overall reliability of the system and the operation convenience of the user.

[0045] The current detection circuit 300 further includes a rectification module 310, a voltage division and sampling module 320, and a high-frequency filtering module 330. The load circuit 200 is connected to the input end of the rectification module 310. The output end of the rectification module 310 is connected to the input end of the voltage division and sampling module 320. The output end of the voltage division and sampling module 320 is connected to the input end of the high-frequency filtering module 330. The output end of the high-frequency filtering module 330 is connected to the output port MOTOAD.

[0046] In this embodiment, the rectification module 310 first converts the alternating current of the load circuit 200 into direct current. Subsequently, the voltage division and sampling module 320 performs voltage division and sampling on the rectified current to adapt the signal to the voltage range for subsequent processing. Finally, the high-frequency filtering module 330 filters out the high-frequency noise in the signal to ensure that the signal output to the MOTOAD port is clear and error-free. This linkage ensures the accuracy and efficiency of current detection, and improves the safety and reliability of the entire coffee machine system.

[0047] As a preference rather than a limitation, the current detection circuit further includes a temperature monitoring module. The temperature monitoring module is directly connected to the main control chip 110 to monitor the temperature of each key component in the circuit in real time. The temperature monitoring module collects data through a temperature sensor and transmits the data to the main control chip 110 through a fifth port, enabling the main control chip to adjust the current output or initiate safety protection measures according to the temperature data to prevent overheating from damaging the coffee machine.

[0048] The fifth port is used to transmit the data collected by the temperature monitoring module to the main control chip 110.

[0049] Specifically, the temperature monitoring module includes multiple NTC thermistors, a power management circuit, an analog-to-digital converter, and a microcontroller unit. Among them, the NTC thermistors are used to monitor the temperature change in real time. The output signal of the NTC thermistors is sent to the analog-to-digital converter, where the signal is converted into a digital form for easy processing by the microcontroller. The microcontroller unit is responsible for receiving the converted digital signal and executing a preset algorithm to determine whether the dangerous temperature threshold is reached. If a too high temperature is detected, the MCU will send a warning signal through the communication interface connected to the main control chip 110 or directly control the current output terminal to stop working to prevent the device from overheating. The power management circuit ensures that all sensors and processing units are supplied with stable and safe power. The temperature monitoring module not only improves the operating safety of the coffee machine, but also provides important data for maintenance, helping to avoid failures and maintenance costs caused by overheating.

[0050] Optionally, the rectification module 310 includes an inductor T2, a rectifier DB2, a resistor R14, a capacitor C4, and a capacitor EC5. The voltage division and sampling module 320 includes a resistor R13 and a resistor R15. The high-frequency filtering module 330 includes a resistor RJ2, a capacitor C5, a capacitor EC6, and an output port MOTOAD, where:

[0051] The mutual inductor T2 has a mutual inductance port 1, a mutual inductance port 2, a mutual inductance port 3, and a mutual inductance port 4. The mutual inductance port 1 is connected to the live wire. The mutual inductance port 3 is connected to the load circuit 200. The mutual inductance port 2 is connected to the input end of the rectifier DB2 and one end of the capacitor C4. The other end of the capacitor C4 is connected to the mutual inductance port 4 and the other input end of the rectifier DB2. The positive output end of the rectifier DB2 is connected to one end of the capacitor EC5, one end of the resistor R13, and one end of the resistor R14. The negative output end of the rectifier DB2 is connected to one end of the resistor R15, one end of the capacitor EC6, and one end of the capacitor C5. The negative output end of the rectifier DB2 is also connected to the other ends of the capacitor EC5 and the resistor R14. The other end of the resistor R13 is connected to one end of the resistor RJ2. The other end of the resistor R13 is also connected to the other ends of the capacitor EC6, the capacitor C5, and the resistor R15. The other end of the resistor RJ2 is connected to the other end of the C5 and the output port MOTOAD.

[0052] In this embodiment, the precise linkage among the mutual inductor T2, the rectifier DB2, the resistor R14, the capacitor C4, the capacitor EC5, the resistor R13, the resistor R15, the resistor RJ2, the capacitor C5, and the capacitor EC6 constitutes a signal processing network. The mutual inductor T2 is responsible for collecting the original current signal and converting it into a voltage signal that can be used for further processing. The rectifier DB2 converts the AC signal into DC. At the same time, the capacitors C4 and EC5 assist in smoothing the output voltage, reducing noise, and improving the clarity and reliability of the signal. The voltage division sampling module appropriately steps down and divides the voltage of the current through the resistors R13 and R15 to adapt to the processing requirements of the subsequent circuit. The high-frequency filtering module effectively removes the high-frequency interference in the signal through the combination of the capacitors C5 and EC6 and the resistor RJ2, ensuring that the signal output to the MOTOAD port is pure and error-free. This refined circuit design not only improves the detection accuracy but also optimizes the stability and response speed of the overall circuit.

[0053] As a preference rather than a limitation, the current detection circuit further includes a fault diagnosis module. The fault diagnosis module is directly connected to the sixth port of the main control chip 110 and works in parallel with the current detection circuit. The fault diagnosis module is used to analyze the current and voltage waveforms output by the circuit, identify possible abnormalities or trends, and thus timely detect and give early warnings of potential faults.

[0054] The sixth port is used to transmit the current and voltage waveforms output by the circuit for analysis to the main control chip 110.

[0055] The following points need to be noted for the circuit parameters of the current detection part:

[0056] 1. Application scenario: A fully automatic coffee machine with a load current less than 15A.

[0057] 2. Selection of the R13 / R15 voltage division: (R13 + R15) * Iac / N.

[0058] 3. The functions of capacitors EC6 and C5 are to filter signal interference.

[0059] 4. The sampling resistors RS1 and RS2 are selected as 2W power resistors.

[0060] 5. The voltage value needs to be detectable (at least 10 AD value changes corresponding to 50W).

[0061] 6. The MCU selects a chip with ADC function, the power supply voltage width is 2.4 - 5.5V, the DC motor is controlled by a relay. After the current is collected and amplified by the mutual inductor, the current sampling resistor is used for current detection to protect the normal operation of the machine, and the load current is less than 15A.

[0062] Optionally, the load circuit 200 includes a motor control sub - circuit 210, a motor drive sub - circuit 220, and a relay 230. The second port 112 is connected to the input end of the motor control sub - circuit 210. The output end of the motor control sub - circuit 210 is connected to the normally - closed contact of the relay 230. One end of the normally - open contact of the relay 230 is connected to the live wire, and the other end is connected to the mutual inductor port 1. The mutual inductor port 3 is connected to the input end of the motor drive sub - circuit 220.

[0063] In this embodiment, by connecting the motor control sub - circuit 210 through the second port 112 of the main control chip 110, the control signal can be accurately transmitted to the relay 230, thereby realizing effective control of the motor: The relay 230 serves as a connection point. On the one hand, it is connected to the live wire, and on the other hand, it is connected to the load circuit through the mutual inductor port 1 to ensure the safe supply of power. The motor drive sub - circuit 220 receives the control signal from the motor control sub - circuit 210 and then drives the motor to operate, which not only ensures the accuracy and response speed of motor control but also improves the safety and reliability of the entire system.

[0064] Optionally, the motor control sub - circuit 210 includes a resistor R17, a resistor R18, a triode Q1, and a diode D4, where:

[0065] One end of the resistor R17 is connected to the output port MOTOAD. The other end of the resistor R17 is connected to one end of the resistor R18 and the base of the triode Q1. The other end of the resistor R18 is connected to the emitter of the triode Q1 and GND. The collector of the triode Q1 is connected to one end of the diode D4 and the normally - closed contact of the relay 230. The other end of the diode D4 is connected to the other normally - closed contact of the relay 230.

[0066] In this embodiment, the configuration of resistors R17 and R18 ensures the correct biasing of the base of transistor Q1, thus precisely controlling its switching state. Transistor Q1, as the main switching element, has its collector connected to relay 230 through diode D4 to control the activation and disconnection of the relay, thereby controlling the on-off of the motor circuit. Diode D4 plays a reverse protection role in the circuit, preventing voltage backflow from damaging the transistor or other sensitive components. This not only optimizes the response time and operation stability of the motor but also reduces the circuit failure rate and improves the reliability of the overall device.

[0067] Optionally, the motor drive sub-circuit 220 includes rectifier DB3, inductor L3, varistor ZR2, fuse P1, capacitor C7, capacitor C8, and motor port CN2, where:

[0068] The motor port CN2, varistor ZR2, and capacitor C7 are connected in parallel with each other. The two ends of capacitor C7 are connected to inductor L3. Inductor L3 is connected in parallel with capacitor C8. One end of capacitor C8 is connected to the negative output terminal of rectifier DB3, and the other end of capacitor C8 is connected to one end of fuse P1. The other end of fuse P1 is connected to the positive output terminal of rectifier DB3. The input terminal of rectifier DB3 is connected to mutual inductance port 1, and the other input terminal of rectifier DB3 is connected to the neutral line.

[0069] In this embodiment, the design of the motor drive sub-circuit 220 cleverly utilizes the interaction of rectifier DB3, inductor L3, varistor ZR2, fuse P1, and capacitors C7 and C8, effectively improving the circuit stability and the protection efficiency of the motor: Rectifier DB3 converts alternating current into direct current for the motor to use. Inductor L3 and capacitors C7 and C8 together form a filtering network, effectively suppressing power supply noise and reducing voltage fluctuations to ensure a stable power input for the motor. Varistor ZR2 serves as overvoltage protection and can quickly respond when the voltage is abnormal to protect the circuit from damage. Fuse P1 disconnects the circuit when the current is too large to prevent damage caused by overcurrent.

[0070] Optionally, it further includes a switch circuit 400. The switch circuit 400 is used to provide a pre-start signal for the load circuit 200. The control circuit 100 further includes a third port 113. The control circuit 100 receives the pre-start signal from the switch circuit 400 through the third port 113. After receiving the pre-start signal, the control circuit 100 outputs a high level to the input terminal of the motor control sub-circuit 210 through the third port 113.

[0071] The third port is used to output a pre-start signal to the control circuit 100.

[0072] In this embodiment, the linkage of the switch circuit 400 with the control circuit 100 and the motor control sub - circuit 210 greatly enhances the startup efficiency and safety of the coffee machine: The switch circuit 400 is responsible for generating a pre - startup signal, which is transmitted through the third port 113 of the control circuit 100 to activate the motor control sub - circuit 210, ensuring that the motor is in a ready state before receiving the full startup signal, shortening the startup time, and avoiding possible electrical faults during startup through pre - circuit checks.

[0073] Optionally, it further includes a switch - mode power supply circuit 500, and the switch - mode power supply circuit 500 is used to convert 220V alternating current into 5V direct current.

[0074] In this embodiment, the rectifier DB1 rectifies the alternating current into direct current, and then the filter network composed of the capacitor EC1 and L1 smooths the current to reduce voltage fluctuations and noise. The voltage - regulating IC U1 further adjusts the output voltage to ensure the stability and accuracy of the output voltage.

[0075] In addition, the protection components in the circuit, such as the fuse F1 and the varistor ZR1, ensure the safety of the entire system in case of current overload or abnormal voltage, thereby extending the service life of the equipment and reducing the maintenance cost.

[0076] Specifically, the rectifier DB1 converts the AC power supply ACN into a DC power supply. The rectifier DB1 is connected to the AC input terminal ACN and ACN1 and is connected to one end of the filter capacitor EC1 through R7;

[0077] The inductor L1 and the capacitor EC1 form a filter network for smoothing the rectified direct current, reducing voltage fluctuations and power - supply noise. One end of the inductor is connected to the output of the rectifier, and the other end is connected to the input terminal of the voltage - regulating IC U1.

[0078] The varistor ZR1 is connected to the AC input terminal as an over - voltage protection component to protect the circuit from damage by accidental high voltages.

[0079] The fuse F1 provides over - current protection to prevent circuit overload.

[0080] The input terminal of the voltage - regulating IC U1 is connected to the rectified power supply through the inductor L1, and the output terminal of the voltage - regulating IC U1 is connected to the output capacitor C2. The voltage - regulating IC U1 is responsible for outputting a stable 5V direct current.

[0081] The capacitors EC1, EC2, C1, and C2 are combined for filtering and stabilizing the voltage to ensure the quality of the power supply. Among them, C2 is used at the output terminal of the voltage - regulating IC to ensure the stability of the output voltage.

[0082] The diodes D1, D2, and D3 are combined to prevent reverse current flow.

[0083] The transformer T1 is used for voltage conversion and isolation.

[0084] The resistors R1, R2, R3, R4, R5, R6, R8, R10, R11, and R12 are used to set circuit parameters and provide current-limiting protection to ensure the normal operation of each part of the circuit.

[0085] The connector CN1 provides a connection point between the circuit and external devices.

[0086] The above is only used to illustrate the technical solution of the present utility model and not to limit it. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present utility model shall be covered within the scope of the claims of the present utility model as long as they do not depart from the spirit and scope of the technical solution of the present utility model.

Claims

1. A current analysis circuit for a coffee machine, characterized in that, It includes a load circuit (200), a current detection circuit (300) and a control circuit (100). The current sampling output end of the load circuit (200) is connected to the input end of the current detection circuit (300). The output end of the current detection circuit (300) is connected to the current sampling input end of the control circuit (100). The control end of the control circuit (100) is connected to the controlled end of the load circuit (200). The control circuit (100) is used to send a stop working signal to the load circuit (200).

2. The current analysis circuit of a coffee machine according to claim 1, characterized in that, The current detection circuit (300) further includes a rectification module (310), a voltage division sampling module (320) and a high-frequency filtering module (330). The load circuit (200) is connected to the input end of the rectification module (310). The output end of the rectification module (310) is connected to the input end of the voltage division sampling module (320). The output end of the voltage division sampling module (320) is connected to the input end of the high-frequency filtering module (330). The output end of the high-frequency filtering module (330) is connected to the output port MOTOAD.

3. The current analysis circuit of a coffee machine according to claim 2, characterized in that, The rectification module (310) includes a transformer T2, a rectifier DB2, a resistor R14, a capacitor C4 and a capacitor EC5. The voltage division sampling module (320) includes a resistor R13 and a resistor R15. The high-frequency filtering module (330) includes a resistor RJ2, a capacitor C5, a capacitor EC6 and the output port MOTOAD, where: The transformer T2 has a mutual inductance port 1, a mutual inductance port 2, a mutual inductance port 3 and a mutual inductance port 4. The mutual inductance port 1 is connected to the live wire. The mutual inductance port 3 is connected to the load circuit (200). The mutual inductance port 2 is connected to the input end of the rectifier DB2 and one end of the capacitor C4. The other end of the capacitor C4 is connected to the mutual inductance port 4 and the other input end of the rectifier DB2. The positive output end of the rectifier DB2 is connected to one end of the capacitor EC5, one end of the resistor R13 and one end of the resistor R14. The negative output end of the rectifier DB2 is connected to one end of the resistor R15, one end of the capacitor EC6 and one end of the capacitor C5. The negative output end of the rectifier DB2 is also connected to the other ends of the capacitor EC5 and the resistor R14. The other end of the resistor R13 is connected to one end of the resistor RJ2. The other end of the resistor R13 is also connected to the other ends of the capacitor EC6, the capacitor C5 and the resistor R15. The other end of the resistor RJ2 is connected to the other end of the C5 and the output port MOTOAD.

4. The current analysis circuit of a coffee machine according to claim 3, characterized in that, The load circuit (200) includes a motor control sub-circuit (210), a motor drive sub-circuit (220) and a relay (230). The second port (112) is connected to the input end of the motor control sub-circuit (210). The output end of the motor control sub-circuit (210) is connected to the normally closed contact of the relay (230). One end of the normally open contact of the relay (230) is connected to the live wire, and the other end is connected to the mutual inductance port 1. The mutual inductance port 3 is connected to the input end of the motor drive sub-circuit (220).

5. The current analysis circuit of a coffee machine according to claim 1, wherein The control circuit (100) further includes a main control chip (110). The main control chip (110) includes a first port (111) and a second port (112). The main control chip (110) is connected to the output end of the current detection circuit (300) through the first port (111). The main control chip (110) is connected to the control end of the load circuit (200) through the second port (112). The main control chip (110) is also provided with a preset current threshold value. Wherein, the main control chip (110) sends a stop working signal to the load circuit (200) through the second port.

6. The current analysis circuit of a coffee machine according to claim 4, characterized in that The motor control sub-circuit (210) includes a resistor R17, a resistor R18, a triode Q1, and a diode D4, where: One end of the resistor R17 is connected to the output port MOTOAD. The other end of the resistor R17 is connected to one end of the resistor R18 and the base of the triode Q1. The other end of the resistor R18 is connected to the emitter of the triode Q1 and GND. The collector of the triode Q1 is connected to one end of the diode D4 and the normally closed contact of the relay (230). The other end of the diode D4 is connected to the other normally closed contact of the relay (230).

7. The current analysis circuit of a coffee machine according to claim 4, wherein, The motor drive sub-circuit (220) includes a rectifier DB3, an inductor L3, a varistor ZR2, a fuse P1, a capacitor C7, a capacitor C8, and a motor port CN2, where: The motor port CN2, the varistor ZR2, and the capacitor C7 are connected in parallel with each other. Both ends of the capacitor C7 are connected to the inductor L3. The inductor L3 is connected in parallel with the capacitor C8. One end of the capacitor C8 is connected to the negative output end of the rectifier DB3. The other end of the capacitor C8 is connected to one end of the fuse P1. The other end of the fuse P1 is connected to the positive output end of the rectifier DB3. The input end of the rectifier DB3 is connected to the mutual inductance port 1. The other input end of the rectifier DB3 is connected to the zero line.

8. A coffee machine current analysis circuit according to claim 1 or 2, characterized in that, It further includes a switch circuit (400). The switch circuit (400) is used to provide a pre-start signal for the load circuit (200). The control circuit (100) further includes a third port (113). The control circuit (100) receives the pre-start signal from the switch circuit (400) through the third port (113). After receiving the pre-start signal, the control circuit (100) outputs a high level to the input end of the motor control sub-circuit (210) through the third port (113).

9. An espresso machine current analysis circuit according to claim 1 or 2, characterized in that, It further includes a switching power supply circuit (500). The switching power supply circuit (500) is used to convert 220V alternating current into 5V direct current.

10. A coffee machine, characterized in that, It includes a coffee machine current analysis circuit according to any one of claims 1-9.

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