Portable coffee machine

Abstract

The portable coffee machine comprises a water bin, a coffee machine body and a cup body from top to bottom, the upper end of the water bin is connected with a water bin cover, a display screen and keys are arranged on the surface of the coffee machine body, a control circuit, a heating disc, a water pump, a temperature sensor and a power source are arranged in the coffee machine body, and the heating disc is arranged at the bottom of the water bin; the bottom of the coffee machine main body is connected with an extraction chamber seat in a spinning manner.

Description

Technical Field

[0001] This invention relates to coffee machines, and more particularly to a portable coffee machine. Background Technology

[0002] Coffee is one of the most popular beverages in human society. People pursue the quality and artistic conception of coffee, and the tools for making coffee are constantly being innovated.

[0003] A portable coffee maker is a coffee-making device designed for travel, camping, office use, or daily commutes. Its compact size and portability allow users to enjoy the aroma of freshly ground coffee anytime, anywhere. Compared to traditional coffee machines, it emphasizes lightweight design, ease of operation, and rapid extraction, making it ideal for coffee lovers on the go. Currently, portable coffee makers primarily focus on espresso, with fewer Americano-style machines available, as Americano machines require larger water tanks to ensure sufficient water supply.

[0004] Existing technology, such as Chinese Patent Announcement CN217565704U, discloses a novel capsule coffee machine, including a base, a quantitative dispensing module, and a telescopic dispensing module. The upper and lower ends of the base are provided with threaded grooves. A grinding cup is threadedly connected to the upper end of the base through the threaded grooves, and a stirring cup is threadedly connected to the lower end of the base through the threaded grooves. The grinding cup and stirring cup are made of either transparent plastic or glass. Stirring shafts are rotatably connected to the left and right sides of the lower end of the base. Stirring blades are provided at the lower part of each stirring shaft, and the upper end of each stirring shaft extends into the base and is connected to a driven gear. The quantitative dispensing module is located on the right side inside the base, and the telescopic dispensing module is located on the left side inside the base.

[0005] For example, Chinese Patent Announcement CN209863405U discloses a portable coffee machine, which includes a water cup body, a coffee machine body, and a coffee brewing base arranged from top to bottom. The coffee machine body is equipped with a control circuit and a power supply device. The coffee machine is also equipped with a switch, which is connected to the control circuit. The water cup body includes a cup base and a cup body. A thick film heating element is embedded in the cup base. The thick film heating element is electrically connected to the control circuit. The thick film heating element has a water inlet channel that communicates with the coffee machine body. The upper surface of the thick film heating element is exposed and can directly contact the water. The top of the cup body is equipped with an air inlet and a pressure relief hole. The air inlet is equipped with a two-way air valve, and the two-way air valve covers the pressure relief hole.

[0006] The aforementioned existing technology can only brew Italian coffee, has a small water tank, lacks a display device, cannot accurately control the water temperature, and cannot well adapt to various coffee products, such as freely brewing Italian coffee and American coffee.

[0007] However, there is an urgent need in the existing technology for a portable coffee machine technology solution that can meet multiple flavor requirements and accurately control water temperature. Summary of the Invention

[0008] The purpose of this invention is to address the aforementioned problems by providing a portable coffee machine that features a simple structure, high control precision, wide applicability, and an attractive appearance, capable of easily brewing espresso and Americano.

[0009] A portable coffee machine includes, from top to bottom, a water tank, a coffee machine body, and a cup body. The upper end of the water tank is connected to a water tank cover. The surface of the coffee machine body is equipped with a display screen and buttons. The coffee machine body contains a control circuit, a heating plate, a water pump, a temperature sensor, and a power supply. The heating plate is located at the bottom of the water tank. The water pump inlet is connected to the water outlet at the bottom of the water tank. The bottom of the coffee machine body is screwed onto an extraction chamber base.

[0010] According to this invention, because it is specifically designed for portable coffee machines and suitable for outdoor use, it eliminates the need for a boiler and AC power, resulting in a very simple and lightweight structure that allows for a beautiful and user-friendly design. As an electric mechanism, it differs from traditional hand-operated machines, making it ideal for users with limited strength. Significantly different from capsule-type machines, it allows for adjustable coffee extraction temperatures to create customized flavors, achieving a taste comparable to professional coffee-making equipment. The design, featuring an upper water tank and a lower cup body, makes the structure more rational.

[0011] According to the present invention, due to the structure of the external control circuit of the display screen, the status of coffee brewing, such as real-time temperature and heating time, can be directly observed. Due to the limitations of the structural and spatial design of existing technologies such as capsule portable coffee machines, it is difficult to design a display circuit. The present invention easily solves the problem of display circuit layout through a reasonable structural layout.

[0012] According to the present invention, by setting up a water pump and controlling the flow rate of the water pump, it can be used to brew different types of coffee. Specifically, the coffee on the market is espresso, and the amount of coffee liquid is usually fifty or sixty milliliters. If you want to drink American coffee, you need to dilute espresso with water, but the flavor is very different from that extracted in the American way. According to the present invention, by using a large-capacity water tank, American coffee can be directly extracted by adjusting the flow rate.

[0013] The portable coffee machine of the present invention can simultaneously set the temperature and the flow rate, thus allowing users to choose to make espresso or Americano according to their preferences. It can also make different styles of coffee depending on the flavoring ingredients added, meaning it can expand the flavor to make at least three types of coffee. In contrast, while portable devices on the market nominally make Americano, they are actually just espresso with water added, which affects the taste. The portable coffee machine of the present invention, however, sets a certain flow rate and can directly make Americano (not espresso with water).

[0014] According to the present invention, a single-button control mode is adopted, which further makes the coffee machine more aesthetically pleasing and uncluttered. Although there is only one button, it can set the coffee machine to heating mode and non-heating mode. Solving the problem with one button has significant advantages in terms of functionality, appearance, and consumer preference.

[0015] According to the present invention, multiple temperature sensors can be configured and installed wherever temperature control is required. At least one temperature sensor should be installed at the water tank location, specifically at the bottom of the water tank near the heating plate, or it can be installed in any location within the water tank that does not obstruct the overall structure, to monitor the water tank temperature in real time. A temperature sensor can also be installed near the water pump inlet, or an additional temperature sensor can be added at the water pump outlet. The configuration can be freely adjusted based on different price and model requirements.

[0016] According to the present invention, since the extraction chamber base is screwed onto the bottom of the coffee machine body, and the extraction chamber base is integrated with the cup body, the coffee machine can be made more compact in structure, eliminating the embarrassment of forgetting to bring a water cup or having to carry a separate water cup. When traveling, it can be directly packed into a travel bag, making it a truly professional portable coffee maker.

[0017] Preferably, the display screen includes an OLED or a digital tube, used to display the status of coffee brewing, such as real-time temperature, real-time water volume, real-time progress, etc.

[0018] Preferably, the surface of the coffee machine body is also provided with a waterproof plug for waterproofing the charging interface. The waterproof plug is fixed to the charging interface by a connecting strap that is fixed to the coffee machine body on one side, so as to seal the charging interface when not charging, to prevent water from accidentally entering in the wild or from the charging interface getting wet due to water overflowing from the water tank when manually adding water.

[0019] Preferably, the heating plate includes a sintered electric heating plate or a thick-film heating plate. The main purpose of using a sintered electric heating plate or a thick-film heating plate in this invention is for a compact and rational structural design, higher thermal efficiency, longer heating time, and the ability to produce larger volumes of coffee. In the prior art, non-sintered thick-film heating plates are typically used to heat the water tank. However, this often results in significantly increased resistance over time or the accumulation of unwanted particles or dust on the surface, leading to poor heating. Therefore, using a sintered electric heating plate or a thick-film heating plate is more effective. In this invention, precise temperature control is required for optimal flavor, so the choice of heating device that provides preheating functionality often yields significantly different results. This is the applicant's first attempt in the industry to achieve this, thanks to the rationality and compactness of this design. Those skilled in the art understand the crucial importance of providing precise temperature control and well-controlled preheating for coffee brewing. This solution requires precise temperature control at three levels: 88 / 92 / 96℃. In other words, to produce a portable coffee machine with a flavor comparable to professional coffee machines, every step that could potentially affect the taste is meticulously considered, despite its portable electric structure. While sintered heating plates or thick-film heating plates are more expensive than other devices that convert electrical energy into heat, such as heating wires or heating elements, they are still highly recommended for significantly improving the flavor of the brewed coffee.

[0020] Preferably, the temperature sensor includes an NTC thermistor. The reason for using an NTC thermistor in this invention is that its temperature detection sensitivity is more suitable for miniaturized devices, and it can work well with the MPU to achieve voltage divider feedback. Since this temperature control detail is not part of the inventive point of this technical solution, it will not be elaborated upon, but will be detailed in another patent application filed by the applicant.

[0021] Preferably, the water tank lid features a snap-free design. Since this portable coffee machine is designed for convenient travel, the water tank is pre-filled with the designated amount of mineral or purified water before departure. Therefore, the water tank lid needs to be designed to be leak-proof when the coffee machine is placed in a travel bag, and a snap-free design allows for easy disassembly. A water inlet can also be designed near the center of the water tank lid for easy filling with a hose. A vent can also be included to release pressure when the water boils, preventing unnecessary scalding, which is especially important in low-oxygen areas such as high-altitude regions.

[0022] Preferably, a lithium battery is used as the power source. In this invention, due to a greater emphasis on portability, the boiler design is omitted. This eliminates the need for AC power connection or electric water injection; therefore, the power source can directly power various components, such as the water pump, detection circuit, extraction motor, and display screen, using lithium batteries. Batteries with varying lifespans are used depending on the price and model. Heated versions use high-power, high-rate discharge batteries, while non-heated versions use ordinary lithium-ion batteries. Although lithium batteries are currently the mainstream, with further technological advancements, they will also be suitable for applications such as vanadium batteries and phosphorus batteries in the future. The lithium battery mentioned in this solution refers only to an energy storage battery capable of providing the required power, and is not limited to lithium batteries containing lithium elements.

[0023] Preferably, a temperature protection circuit is still installed inside the coffee machine body. Since the inventive point of this solution is not the temperature protection circuit, the specific structure of the temperature protection circuit is not described in detail. In fact, for portable coffee machines, it is necessary to provide protection in situations such as dry burning, low water, or overload, to avoid fire or unwanted damage.

[0024] Preferably, the temperature protection circuit includes a resettable temperature control switch and a temperature fuse. The fuse can be made of heat-resistant materials such as aluminum-magnesium alloy or nickel-copper alloy (both resettable and non-resettable fuses can be used).

[0025] In addition to the aforementioned benefits, the present invention also includes at least the following advantages due to the adoption of the above-described technical solutions: (1) The portable coffee machine of the present invention is equipped with a display screen, which can improve the control accuracy of the coffee machine and thus ensure the taste of the brewed coffee; (2) The extraction chamber can be used for different types of coffee products, such as Americano, Italian coffee, etc., thus improving the applicability of the portable coffee machine of the present invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the overall structure of a portable coffee machine according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the internal structure of a portable coffee machine according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the structure of the extraction chamber base of a portable coffee machine according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the control circuit module of a portable coffee machine according to an embodiment of the present invention; Figure 5This is a control circuit diagram illustrating a portable coffee machine according to an embodiment of the present invention. (a) is a detection circuit diagram of the temperature protection circuit; (b) is a control circuit diagram of the control circuit controlling the heating plate; Figure 6 This is a schematic diagram illustrating a temperature protection circuit module of a portable coffee machine according to an embodiment of the present invention.

[0028] Figure Labels: 1- Water tank; 2- Coffee machine body; 3- Cup body; 4- Power supply; 5- Control circuit; 51- Power control circuit; 52- Temperature control circuit; 54- Resettable temperature control switch; 55- Water tank NTC; 56- Battery temperature monitoring NTC; 57- Temperature fuse; 6- Water pump; 7- Extraction chamber; 8- Powder container; 9- Drip outlet; 10- Heating plate; 11- Water tank cover; 12- Exhaust port; 13- Temperature sensor; 14- Water pump inlet; 15- Water pump outlet; 16- Extraction cup; 17- Upper extraction chamber; 18- Lower extraction chamber; 19- Extraction motor; 20- Stirrer; 21- Display screen; 22- Buttons; 23- Extraction chamber base; 24- Waterproof charging plug Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings.

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] Figure 1 This is a schematic diagram of the overall structure of a portable coffee machine according to the present invention. Figure 2 This is a schematic diagram of the internal structure. Figure 3 This is a schematic diagram of the extraction chamber seat.

[0032] like Figure 1-3As shown, a portable coffee machine according to one embodiment of the present invention includes, from top to bottom, a water tank 1, a coffee machine body 2, and a cup body 3. A water tank cover 11 is connected to the upper end of the water tank 1. A display screen 21 and buttons are provided on the surface of the coffee machine body 2. The coffee machine body 2 contains a control circuit 5, a heating plate 10, a water pump 6, a temperature sensor 13, and a power supply 4. The heating plate 10 is located at the bottom of the water tank 1. The water inlet 14 of the water pump 6 is connected to the water outlet 15 at the bottom of the water tank 1. An extraction chamber seat 23 is screwed onto the bottom of the coffee machine body 2, and the cup body 3 is connected to the coffee machine body 2 as a single unit through the extraction chamber seat 23. The cup body 3 can be screwed onto the coffee machine body 2 and detached by reverse threading. Alternatively, a negative pressure method can be used, where the materials, inner and outer diameters, and shapes of the extraction chamber seat 23 and the cup body 3 are adapted to create negative pressure when the extraction chamber seat 23 is inserted into the opening of the cup body 3, making it difficult for the cup body 3 to detach from the extraction chamber seat 23.

[0033] An extraction cup 16 is installed in the cup body 3, which forms an extraction chamber 7. The extraction chamber 7 is divided into an upper extraction chamber 17 and a lower extraction chamber 18 connected to each other. The upper extraction chamber 17 is connected to the coffee powder container 8. A drip outlet 9 is provided at the lower end of the lower extraction chamber 18. Water pumped by the water pump 6 from the water tank 1 flows through the water inlet 14, the water outlet 15 and the coffee powder container 8, and reaches the extraction cup 7. The extraction motor located at the bottom of the extraction chamber 7 drives the stirrer 20 to stir. After the process is completed, the water drips into the cup body 3 through the drip outlet 9, thus making a whole cup of delicious coffee.

[0034] In a further preferred embodiment, a temperature sensor can also be installed at a suitable position on the extraction cup 7 to accurately control the temperature. When the detected temperature is lower than the ideal temperature, the extraction action is not performed, and the heating plate is activated to heat the cup.

[0035] In this invention, since it is specifically designed for portable coffee machines and suitable for outdoor use, the use of a boiler and AC power is eliminated. The design of an upper water tank 1 and a lower cup body 3 is adopted, making the structural design more reasonable.

[0036] In this invention, because of the structure of the display screen 21 connected to the external control circuit 5, the status of coffee brewing, such as real-time temperature, real-time water volume, real-time progress, etc., can be observed intuitively.

[0037] In this invention, a single-button control mode is adopted, which makes the coffee machine look cleaner and more beautiful. Although there is only one button 22, the coffee machine can be set to heating mode and non-heating mode.

[0038] In this invention, multiple temperature sensors 13 can be configured, and can be installed wherever temperature control is required. At least one temperature sensor 13 should be installed at the water tank 1, specifically, at the bottom of the water tank 1 near the heating plate 10, or it can be installed in any position on the water tank 1 that does not obstruct the overall structure, to monitor the temperature of the water tank 1 in real time. A temperature sensor can also be installed near the inlet 14 of the water pump 6, or an additional temperature sensor can be added at the outlet 15 of the water pump 6. The configuration can be freely adjusted according to different price and model requirements.

[0039] In this invention, because the bottom of the coffee machine body 1 is connected to the extraction chamber base 23 by a screw-on mechanism, and the extraction chamber base 23 is integrated with the cup body 3, the coffee machine structure is more compact, eliminating the embarrassment of forgetting to bring a water cup or having to carry one separately. In one preferred embodiment, the display screen is a 0.49-inch OLED display screen; in another preferred embodiment, the display screen is made of a 0.28-inch digital tube and is used to display the status of coffee brewing, such as real-time temperature, real-time water volume, real-time progress, etc.

[0040] In a preferred embodiment, the surface of the coffee machine body 2 is further provided with a waterproof plug 24 for waterproofing the charging interface. The waterproof plug 24 is fixed to the charging interface by a connecting strap fixed to the coffee machine body 2 on one side, so as to seal the charging interface when not charging, to prevent water from accidentally entering in the wild or from the charging interface getting wet due to water overflowing from the water tank when manually adding water.

[0041] In a preferred embodiment, the heating plate 10 is a sintered electric heating plate or a thick-film heating plate. The main purpose of using a sintered electric heating plate or a thick-film heating plate in this invention is for the sake of a compact and rational structural design. In this invention, precise control of the brewing temperature is required to achieve a good taste; therefore, the choice of heating device that can provide preheating functions will have significantly different effects. The temperature can be precisely controlled at three levels: 88 / 92 / 96℃. In other words, in this invention, in order to brew a portable coffee machine with a taste comparable to a professional coffee machine, every step that might affect the taste is carefully considered, despite it being a portable electric structure.

[0042] In a preferred embodiment, the temperature sensor 13 includes an NTC thermistor. The reason for using an NTC thermistor in this invention is that its temperature detection sensitivity is more suitable for miniaturized devices, and it can work well with the MPU to achieve voltage divider feedback.

[0043] In a preferred embodiment, the water tank cover 11 adopts a snap-free design. Since this portable coffee machine is designed for convenient travel, the water tank is pre-filled with the required amount of mineral or purified water before departure. Therefore, the water tank cover 11 needs to be designed to be leak-proof when the coffee machine is placed in a travel bag. The snap-free design ensures a good seal while allowing for easy disassembly. A water inlet can also be designed near the center of the water tank cover for easy water filling using a hose or similar device. A vent 12 can also be designed to release pressure when the water in the water tank boils, preventing unnecessary scalding, which is especially important in high-altitude areas with low oxygen levels.

[0044] In a preferred embodiment, the power source 4 uses a lithium battery. In this invention, due to a greater emphasis on portability, the boiler design is omitted. Therefore, there is no need to consider AC power connection or electric water injection; the power source 4 can directly power various components using lithium batteries, such as the water pump, the extraction motor, the control circuit, the temperature sensor, and the display screen (which can also be powered individually by button batteries), etc. Depending on the price and model, batteries with varying battery life are used.

[0045] Figure 4 This invention illustrates the control circuit structure of a portable coffee machine according to the present invention; Figure 5 (a) and Figure 5 (b) shows the structure of the temperature detection circuit; Figure 6 The structure of the temperature protection circuit is shown.

[0046] like Figure 4As shown, to power the various components, the portable coffee machine control circuit 5 of this invention includes a power control circuit 51 (hereinafter referred to as the power control circuit 51), a heating plate temperature control circuit 52 (hereinafter referred to as the temperature control circuit 52), and a water pump drive circuit (not shown). As their names suggest, these circuits are used to control the power battery, the heating temperature of the heating plate, and the operation of the water pump, respectively. The circuit can be selectively used depending on the price and model. For example, a low-end model may not have a heating plate and therefore does not require a temperature sensor or temperature control circuit; or it may not require a display screen. The battery 4 is a rechargeable lithium battery. The power control circuit 51, temperature control circuit 52, and water pump drive circuit are all located within the portable coffee machine body 2. One end of the power control circuit 51 is connected to the battery 4, and the other end is connected to the heating plate 10, and it communicates with the control circuit 5. The temperature control circuit 52 is located inside the control circuit 5. In heating mode, the heating plate 10 is powered by the power control circuit 51 to heat the water in the water tank, while the temperature sensor probe from the temperature control circuit 52 detects the temperature in the water tank. When the water temperature in the water tank reaches the set temperature value, the control circuit 5 controls the power control circuit 51 via communication to stop the heating plate from heating. It should be noted that the water temperature is not heated to boiling and then cooled to the set temperature, so drinking water must be added. Next, the control circuit 5 controls the water pump 6 to draw water from the water tank 11 through the water pump drive circuit. The water enters the extraction chamber for coffee extraction and finally flows into the cup. In this invention, the inclusion of a water pump 6, driven by a pump drive circuit, allows for the control of the water pump flow rate, enabling the brewing of different coffee types. Specifically, due to the complete extraction structure, reducing the flow rate allows the coffee powder to dissolve more thoroughly in the water over a longer period, resulting in a finer coffee liquid during stirring, thus directly extracting Americano. At a conventional flow rate, espresso is extracted. In other words, the portable coffee machine of this invention allows for setting the temperature and flow rate simultaneously, enabling users to choose between making espresso or Americano, and also to create different styles of coffee based on added flavorings. This means it can expand the flavor profile to make at least three types of coffee. The portable coffee machine of this invention, with its set flow rate, can directly produce Americano (non-espresso with water).

[0047] The temperature control circuit 52 is used to detect the output temperature of the heating plate 10 and the rate of temperature change of the output temperature of the heating plate 10 within a unit time, and outputs a temperature detection signal to the control circuit 5. The control circuit 5 determines the output temperature of the heating plate and the rate of temperature change based on the temperature detection signal. When the output temperature of the heating plate 10 reaches a threshold, or when the rate of temperature change reaches a preset threshold, the control circuit 52 outputs a first pulse modulation signal, and the power control circuit 51 responds by disconnecting the power supply from the heating plate 10, so that the heating plate stops working. The preset threshold can be 100 degrees Celsius. In a preferred embodiment of the present invention, the threshold is set to three levels: 88 / 92 / 96℃. Heating directly to this level temperature is sufficient. Alternatively, the temperature change rate threshold can be set to zero. That is, the rate of temperature change of the output temperature of the heating plate 10 within a unit time is zero, meaning the output temperature of the heating plate 10 does not change within a unit time. At this time, it can be determined that the liquid in the water tank is boiling, and heating can be stopped and left to stand for a few minutes until the temperature reaches the required level. This portable coffee machine is not limited by the different boiling points of water in different regions. When used in flat areas, it can determine the boiling point based on a preset temperature threshold and disconnect the heating plate from the power supply 4 to stop operation. Similarly, when used in high-altitude or low-pressure areas, it can determine the boiling point based on a preset temperature change rate threshold and disconnect the heating plate from the power supply to stop operation. This makes it suitable for both flat areas and high-altitude / low-pressure areas. To prevent unforeseen accidents, this invention also includes a temperature protection circuit. Figure 5 , Figure 6 (As shown), making it less likely for the liquid to boil dry or even damage the portable coffee machine.

[0048] Figure 5 a shows the detection circuit of the temperature sensor. Figure 5 b shows the control circuit for the heating element. The temperature sensor detection circuit includes a voltage divider circuit for the NTC thermistor. The MCU of the control circuit 5 detects the voltage at the NTC terminal of the temperature sensor and converts it into the corresponding temperature. When the heating mode is used, the MCU of the control circuit 5 sends a trigger signal to the field-effect transistor, which connects the heating plate and the power supply, and the heating plate starts to heat up. At this time, the temperature sensor continuously detects the water temperature in the water tank. When the set temperature is reached, the MCU of the control circuit sends a trigger signal to the field-effect transistor, which cuts off the power supply to the heating tube and stops heating.

[0049] The control circuit 51 includes a temperature protection circuit, which comprises a temperature control switch and a temperature fuse. In this invention, the temperature control switch is a resettable temperature control switch. In a preferred embodiment, the temperature detection circuit 52 includes an NTC temperature measurement circuit, which includes an NTC thermistor. In a further preferred embodiment, the NTC temperature measurement circuit further includes a connection resistor, a connection capacitor, and an MPU. The connection resistor is selected as a resistor with a resistance of 390KΩ. The NTC thermistor is used to detect the temperature of the heating plate 10. The resistance value of the NTC thermistor changes according to the temperature change of the heating plate 10. The voltage drop of the NTC thermistor is fed back to the MPU (microprocessor, not shown), so that the control circuit 5 determines the output temperature and temperature change rate of the heating plate 10 based on the temperature detection signal.

[0050] In a preferred embodiment, the coffee machine body 2 also includes a temperature protection circuit. For portable coffee machines, protection is needed for situations such as dry burning, insufficient water, or overload, to prevent fires or unintended damage. In a preferred embodiment, the temperature protection circuit includes a resettable temperature control switch and a temperature fuse. It can employ conventional temperature control switches and fuses, with the fuse made of materials such as aluminum-magnesium alloy or nickel-copper alloy. Figure 6 As shown, it includes a resettable temperature switch and a temperature fuse to prevent dry burning or abnormal situations such as temperature sensor failure, and to cut off the heating of the electric heating plate to avoid safety risks such as fire.

[0051] and Figure 5 Similarly, the heating plate 10 (or electric heating plate 10) is connected to a resettable temperature control switch 54 (or resettable temperature switch), and the power supply 4 is connected to the temperature fuse 57. Figure 5 The difference lies in the fact that separate NTC55 for water tank 11 and NTC56 for battery temperature monitoring are installed for water tank 11 and power supply 4, respectively. In fact, in this... Figure 6 The water tank in the middle is NTC55 Figure 2 The temperature sensor 13 uses an NTC thermistor. The temperature fuse 57 and... Figure 5 Similarly, it is located between the power supply 4 and the temperature control switch 54. The control circuit 5 is located on the control board, and the power supply 4 (or battery 4) is located on the power supply board. The control board and the power supply board are connected via a communication link. A Type-C charging to power supply board is set on the control board, and the interface is protected by a charging waterproof plug 24.

[0052] The button operations of a portable coffee machine according to the present invention are described below. Wake-up operation: Press and hold the button for 3 seconds to wake the screen; Function selection: Press the button once, and after 1 second, enter the non-heating mode; press the button twice, and after 1 second, enter the heating mode; Pause: In working mode, press the button briefly to pause, press it again to continue working until completion; Stop: In working mode, press and hold the button for 2 seconds to stop working mode and enter standby mode; Power off: In standby mode, after 3 minutes of inactivity, enter sleep mode; In standby mode, press and hold the button for 3 seconds to turn off the screen and enter sleep mode; Standby mode: Press the button briefly to wake the product and enter standby mode, at which time the displayed content is the current water temperature.

[0053] The temperature settings of this invention can be set to three levels: 88 / 92 / 96℃.

[0054] The portable coffee machine of this invention has two operating modes: a non-heating mode and a heating mode. Non-heating mode: In standby mode, short presses enter this mode. At this time, the water temperature display flashes; after 1 second, the water pump starts working, and the display shows a countdown, i.e., the "℃" and "℉" icons are off, and the "water droplet" icon flashes for 0.5 seconds; this continues until all the water is pumped out, after which the timer flashes three times and stops, finally displaying the time when the water pump stopped. After one minute, the display returns to standby mode, showing the water temperature. Heating mode: In standby mode, short presses are pressed twice to enter this mode. At this point, the water temperature display flashes (pressing the button briefly will switch between three temperature settings; the first press displays the default 92℃, the second press displays 96℃, the third press displays 88℃, and so on. A long press for 1 second switches the temperature unit). After 3 seconds, the heating element starts heating, and the display shows the current temperature (the "℃" or "℉" icon flashes for 0.5 seconds, and the "water drop" icon turns off). Once 92℃ is reached, heating stops, the water pump starts working, and a timer is activated (the "℃" and "℉" icons turn off, and the "water drop" icon flashes for 0.5 seconds; this continues until all the water is pumped out, at which point the timer flashes three times and stops, finally displaying the time when the pump stopped). After one minute, the display switches to standby mode, showing the water temperature again.

[0055] This article uses specific embodiments to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A portable coffee machine, characterized in that: From top to bottom, the machine includes a water tank (1), a coffee machine body (2), and a cup body (3). The surface of the coffee machine body (2) is equipped with a display screen (21) and buttons (22). Inside the coffee machine body (2) are a control circuit (5), a heating plate (10), a water pump (6), a temperature sensor (13), and a power supply (4). The heating plate is located at the bottom of the water tank (1). The inlet of the water pump is connected to the outlet at the bottom of the water tank (1). The bottom of the coffee machine body (2) is connected to the extraction chamber seat (23) by a snap fastener. The control circuit (5) is divided into a power control circuit (51), a temperature control circuit (52), and a water pump circuit (53), which are used to electrically control the power supply circuit, the temperature sensor, and the water pump motor, respectively. One end of the power control circuit (51) is connected to the power supply (4). The other end is connected to the heating plate (10); the temperature control circuit (52) is set on the heating plate (10), the temperature control circuit (52) is used to detect the output temperature of the heating plate, and detect the temperature change rate of the output temperature of the heating plate (10) within a unit time, and output a temperature detection signal to the control circuit (5); the control circuit (5) determines the output temperature of the heating plate and the temperature change rate based on the temperature detection signal, and the control circuit (5) outputs a pulse modulation signal when the output temperature of the heating plate (10) reaches a threshold, or when the temperature change rate reaches a preset threshold, and the power control circuit (51) responds by disconnecting the connection between the power supply and the heating plate (10) so that the heating plate stops working.

2. The portable coffee machine as described in claim 1, characterized in that: The display screen (21) includes OLED or digital tube.

3. The portable coffee machine as described in claim 1, characterized in that: By controlling the water pump flow rate, it can be used to brew different types of coffee.

4. The portable coffee machine as described in claim 1, characterized in that: The heating plate includes a sintered electric heating plate or a thick film heating plate.

5. The portable coffee machine as described in claim 1, characterized in that: The temperature sensor includes an NTC thermistor.

6. The portable coffee machine as described in claim 1, characterized in that: The water tank cover (11) adopts a snap-free design.

7. The portable coffee machine as described in claim 1, characterized in that: The power source is a lithium battery.

8. The portable coffee machine as described in claim 1, characterized in that: The coffee machine body (2) is also equipped with a temperature protection circuit.

9. The portable coffee machine as described in claim 8, characterized in that: The temperature protection circuit includes a resettable temperature control switch (54) and a temperature fuse (57).

10. The portable coffee machine as described in claim 9, characterized in that: The heating plate (10) is connected to a resettable temperature control switch (54), and the power supply (4) is connected to a temperature fuse (57). A water tank NTC (55) and a battery temperature monitoring NTC (56) are set for the water tank (1) and the power supply (4) respectively. The temperature fuse (57) is set between the power supply (4) and the temperature control switch (54). The control circuit (5) is set on the control board, and the power supply (4) is set on the power supply board. The control board and the power supply board are connected through a communication link. A TypeC charging to power supply board is set on the control board.

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