Small food processor with good anti-interference performance

Abstract

The utility model discloses a small-sized food processor with good anti-interference performance, which comprises a main machine internally provided with a motor and a circuit board, and a partition plate is arranged in the main machine to divide an inner cavity of the main machine into a first cavity for accommodating the motor and a second cavity for installing the circuit board. An MCU circuit module, a switch circuit module, an EMC filter circuit module and a motor driving circuit module are annularly and sequentially arranged along the edge of the circuit board, the MCU circuit module and the EMC filter circuit module are separately arranged, and the switch circuit module and the EMC circuit module are separately arranged. According to the invention, based on the small food processor, on the premise that the motor and the circuit board are separated by the separator in the host so that the installation space of the circuit board is limited, the situation that MCU high-frequency interference is easily generated between the EMC filter circuit module and the MCU circuit module on the circuit board and is coupled to the EMC filter circuit is effectively prevented, and the service life of the circuit board is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a small food processing machine with good anti-interference performance. Background Technology

[0002] Existing food processors, such as meat grinders, typically include a cup body with a built-in mixing blade and a detachable main unit mounted on top of the cup body. The main unit contains a motor connected to the mixing blade. When using the food processor, the user places the ingredients into the cup body, and the mixing blade rotates at high speed driven by the motor to process the ingredients. Generally, two buttons are located on the top of the main unit, one for low-speed processing and the other for high-speed processing. For example, patent application number 201920619866.9 describes a switch control method where a circuit board is mounted on the top of the main unit, with two buttons and corresponding microswitches mounted on top of the circuit board to control the motor's drive. However, this method requires the user to actively control the duration of button presses to determine the motor's operating time, resulting in a random and difficult-to-control effect on the food grinding.

[0003] To improve the controllability of the pulverizing effect in food processors, some researchers have implemented stepless speed regulation by incorporating rectifier diodes on the circuit board. The program controls the motor's operating time by setting different durations for different processing functions, eliminating the need for user control and significantly improving pulverizing efficiency. However, to reduce costs, existing food processors often place the circuit board with rectifier diodes directly in the same space as the motor. This causes carbon dust generated by the motor to splatter onto the circuit board, leading to short circuits and affecting the normal operation of the food processor. To address this, existing technologies use separators between the motor and the circuit board to reduce carbon dust hazards. However, because food processors are often small, especially meat grinders and baby food processors, which require frequent handling and disassembly for cleaning of the lid, body, and blades, the space for the circuit board becomes extremely limited. The circuit board must be made smaller, but the number of components cannot be reduced. This results in very tight integration between components, particularly between the EMC filter circuit module and the MCU circuit module, where high-frequency interference from the MCU can couple into the EMC filter circuit. Utility Model Content

[0004] The purpose of this utility model is to provide a small food processing machine with good anti-interference performance. Taking small food processing machines, such as meat grinders and baby food machines, as the research object, under the premise that the motor and circuit board are separated by a partition in the main unit, resulting in limited installation space for the circuit board, this invention further solves the technical problem that high-frequency interference from the MCU is easily coupled to the EMC filter circuit circuit between the EMC filter circuit module and the MCU circuit module on the circuit board.

[0005] To achieve the above objectives, this utility model provides a small food processing machine with good anti-interference performance, including a main unit with a motor and a circuit board inside. The main unit has a partition to divide the inner cavity of the main unit into a first cavity for accommodating the motor and a second cavity for mounting the circuit board. An MCU circuit module, a switch circuit module, an EMC filter circuit module and a motor drive circuit module are arranged in a ring along the edge of the circuit board, and the MCU circuit module and the EMC filter circuit module are separated. The switch circuit module and the MCU circuit module are also separated.

[0006] This application uses a partition to divide the internal cavity of the host into a first cavity for accommodating the motor and a second cavity for mounting the circuit board, so as to prevent carbon powder generated by the motor from splashing onto the circuit board and causing a short circuit.

[0007] Under this premise, this application arranges the MCU circuit module, switching circuit module, EMC filter circuit module, and motor drive circuit module in a ring along the edge of the circuit board to maximize the actual usable area of ​​the circuit board, allowing each circuit module to be as large as possible and reducing the installation difficulty of the components on each circuit module. The sequential arrangement of the four circuit modules serves two purposes: firstly, the switching circuit module and the motor drive circuit module physically separate the MCU circuit module and the EMC filter circuit module, blocking the transmission of MCU interference signals to the EMC filter circuit module; secondly, the separation of the switching circuit module and the motor drive circuit module increases the physical distance, providing greater heat dissipation space for the main heat-generating components in both modules: the switching power supply and the thyristor, preventing heat buildup from damaging the circuit board. The switching circuit module is adjacent to the MCU circuit module on one side and to the EMC filter circuit module on the other side. This allows the surface-mount filter capacitors in the MCU circuit module and the electrolytic filter capacitors in the switching circuit module to first-stage filter and absorb the high-frequency interference signals generated by the food processor. Then, the high-frequency interference signals generated during the operation of the switching circuit module are second-stage filtered and absorbed by the EMC filter circuit module. The close proximity of the traces between the EMC filter circuit module and the switching circuit module prevents excessive routing from causing electromagnetic interference to other electronic components around these modules. Furthermore, because each module is located at the edge of the circuit board, the distance between the MCU circuit module and the EMC filter circuit module at the center point of the circuit board is maximized. This further prevents high-frequency interference from the MCU between the EMC filter circuit module and the MCU circuit module from coupling to the EMC filter circuit, extending the lifespan of the circuit board installed in the confined space of the second cavity.

[0008] In summary, the technical solution of this application achieves efficient suppression of high-frequency interference from the MCU that is easily coupled to the EMC filter circuit circuit between the EMC filter circuit module and the MCU circuit module on the circuit board, thus improving the service life of the circuit board, under the premise that the motor and the circuit board are separated by a separator in the host and the installation space of the circuit board is limited.

[0009] Preferably, the central area of ​​the circuit board is provided with an interactive circuit module, and the MCU circuit module, the switch circuit module, the EMC filter circuit module, and the motor drive circuit module are arranged around the interactive circuit module.

[0010] This embodiment uses the interactive circuit module as a hardware barrier, further separating the MCU circuit module and the EMC filter circuit module spatially. This avoids the problem of high-frequency interference from the MCU coupling to the EMC filter circuit due to their proximity. Furthermore, the interactive circuit module acts as a barrier between the switching circuit module and the motor drive circuit module, allowing some heat to be absorbed by the module and preventing localized overheating and accelerated damage to the circuit board. Simultaneously, placing the interactive circuit module in the central area of ​​the circuit board provides a better user experience when viewing interactive information.

[0011] Preferably, the interactive circuit module includes an indicator light and a positioning hole that is positioned away from the indicator light, and the partition plate is provided with a positioning post that is matched with the positioning hole.

[0012] Indicator lights are installed on the interactive circuit module to display the corresponding function's operating information. The positioning holes are strategically placed to engage with the positioning posts on the partition, ensuring that the presence of the positioning holes does not affect the arrangement of the indicator lights and also allows for the circuit board's relative positioning and fixation to the partition.

[0013] Preferably, the circuit board is rectangular, with the MCU circuit module and EMC filter circuit module located at two opposite corners of the circuit board, and the motor drive circuit module and switch circuit module located at the remaining two opposite corners of the circuit board.

[0014] The circuit board is designed in a rectangular shape, resulting in a regular structure that facilitates manufacturing. Furthermore, the rectangle maximizes the distance between its two opposite corners. Therefore, the MCU circuit module and the EMC filter circuit module are positioned at opposite corners of the circuit board, maximizing the distance between them and significantly reducing the risk of high-frequency interference from the MCU coupling to the EMC filter circuit. Simultaneously, the distance between the motor drive circuit module and the switching circuit module is also maximized, minimizing the distance between the thyristor in the motor drive circuit module and the switching power supply in the open circuit module—two components that generate significant heat during operation. This prevents heat buildup in these components from damaging the circuit board.

[0015] Preferably, the control circuit of the food processing machine includes a loop formed by the MCU circuit module, the switch circuit module, the EMC filter circuit module, and the motor drive circuit module connected in series from beginning to end.

[0016] By setting the MCU circuit module, switch circuit module, EMC filter circuit module, and motor drive circuit module in series sequentially, the MCU circuit module and EMC filter circuit module are separated, increasing the distance between them. This effectively reduces the risk of high-frequency interference from the MCU generated between the EMC filter circuit module and the MCU circuit module coupling to the EMC filter circuit.

[0017] Preferably, the circuit board is further provided with an interactive circuit module. The control circuit includes a first terminal of the MCU circuit module electrically connected to the second terminal of the switch circuit module, a second terminal of the MCU circuit module electrically connected to the first terminal of the motor drive circuit module, and a third terminal of the MCU circuit module electrically connected to the interactive circuit module.

[0018] In this solution, the MCU circuit module is positioned between the switching circuit module and the motor drive circuit module. The MCU circuit module first acquires and processes the action signals output from the switching power supply circuit and feeds them back to the motor control circuit to control the motor to perform specific actions. The interactive circuit module is connected to the third terminal of the MCU circuit module, allowing the signals processed by the MCU circuit module to be converted into working information for the selected function displayed on the host computer.

[0019] Preferably, the control circuit includes a third terminal of the EMC filter circuit module that is electrically connected to the mains power, a first terminal of the EMC filter circuit module that is electrically connected to the second terminal of the motor drive circuit module, and a second terminal of the EMC filter circuit module that is electrically connected to the first terminal of the switch circuit module.

[0020] In this solution, the third terminal of the EMC filter circuit module is connected to the mains power to prevent interference signals generated during the operation of the food processor from entering the mains power and then entering the motor drive circuit module and the switch circuit module, which could have adverse effects on the motor and the switch. For example, it could cause the internal temperature of the motor to rise, damaging the motor's insulation material and thus shortening the motor's service life, or the interference signals in the mains power could directly damage the motor. It could also cause the signal received or output by the switch to be distorted or lost, reducing the accuracy of the switch.

[0021] Preferably, the partition is provided with a through hole through which the wires for electrical connection between the circuit board and the motor pass, and the through hole is the only path connecting the first cavity and the second cavity.

[0022] Preferably, a fixing adhesive is provided at the through hole to seal the through hole; or,

[0023] A sealing element is fitted at the through hole, and a through hole is provided on the sealing element for the power supply line to pass through.

[0024] To further isolate the carbon powder generated by the motor from splashing onto the circuit board, this application provides two preferred embodiments: First, after the wire passes through the via, the via is fixed with glue. This solution provides excellent sealing and separation between the first and second cavities, effectively improving the problem of carbon powder splashing onto the circuit board. Second, a sealing element is installed at the via. Since the via is unique and fixed, installing the sealing element is more convenient and offers better maintainability compared to the first solution.

[0025] Preferably, the food processor includes a lid, a cup body with a stirring element inside, a main unit for holding and in a cylindrical shape, the main unit being detachably mounted on top of the lid, and the lid covering the rim of the cup body; or,

[0026] The partition is placed horizontally inside the main unit to separate the second cavity and the first cavity into an upper and lower arrangement; or,

[0027] The volume ratio V between the second cavity and the first cavity is between 1 / 5 and 1 / 3.

[0028] In this solution, by placing the partition horizontally and separating the first cavity and the second cavity into an upper and lower arrangement, the radial dimension of the main unit is reduced, making it easier for the user to take the main unit.

[0029] In another embodiment, by setting the volume ratio V of the second cavity to the first cavity to between 1 / 5 and 1 / 3, both the motor and the circuit board have relatively reasonable installation space. This avoids a situation where, if the V value is less than 1 / 5 and the volume of the first cavity accommodating the motor is just right, the volume of the second cavity is too small, resulting in poor heat dissipation of the circuit board and easy burn-out of electronic components on the circuit board after prolonged use. It also avoids a situation where, if the V value is greater than 1 / 3 and the volume of the second cavity accommodating the circuit board is just right, the space for accommodating the motor is too large, leading to an excessively high overall height and center of gravity of the host, affecting the working stability of the host, or an excessively large radial width of the host, making the motor radially larger and inconvenient for the user to handle. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0031] Figure 1 This is a cross-sectional view of a food processing machine according to one embodiment of the present invention;

[0032] Figure 2 This is a three-dimensional structural diagram of a food processing machine according to one embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the circuit board structure in one embodiment of the present invention;

[0034] Figure 4 This is a modular block diagram of the control circuit in one embodiment of the present invention;

[0035] Figure 5 This is a cross-sectional view of the host in another embodiment of the present invention.

[0036] List of components and reference numerals:

[0037] 1-Main unit, 11-First cavity, 12-Second cavity, 13-Motor, 14-Circuit board, 141-EMC filter circuit module, 142-Switch circuit module, 143-MCU circuit module, 144-Motor drive circuit module, 1441-Indicator light; 1442-Positioning hole; 145-Interactive circuit module, 15-Partition plate, 151-Through hole; 152-Positioning post; 2-Cup body, 21-Stirring component. Detailed Implementation

[0038] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0039] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0040] like Figures 1 to 5 As shown, this utility model provides a small food processing machine with good anti-interference performance, which can be a meat grinder, food processor, baby food maker, etc. A meat grinder will be used as an example for specific explanation. The meat grinder includes a main unit 1 with a motor 13 and circuit board 14, a cup lid, and a cup body 2 with a stirring element 21. The main unit 1 is for holding and is slender and cylindrical. The main unit 1 is detachably installed on top of the cup lid, which covers the mouth of the cup body 2. The bottom of the stirring element 21 is positioned against the bottom wall of the cup body 2, and the top of the stirring element 21 extends out of the through hole in the cup lid and is connected to the output end of the main unit 1.

[0041] Understandably, in another type of meat grinder, the lid can also be integrated with the main unit, and this whole unit can be detachably connected to the cup body.

[0042] Since the main unit 1 is usually held, the lateral dimension of the main unit 1 in existing meat grinders is generally no more than 10 cm, which results in extremely limited internal space. Moreover, in order to prevent carbon powder generated by the motor 13 from splashing onto the circuit board 14, the motor 13 and the circuit board 14 need to be separated by a separator, which further reduces the space for mounting the circuit board 14 and the motor 13, making it easy for electromagnetic interference to occur between the electronic components on the circuit board 14.

[0043] Therefore, this utility model provides an implementation scheme:

[0044] First, refer to Figure 1 , 2 5. A partition 15 is provided inside the main unit 1 to divide the internal cavity of the main unit 1 into a first cavity 11 for accommodating the motor 13 and a second cavity 12 for mounting the circuit board 14, to prevent carbon dust generated by the motor 13 from splashing onto the circuit board 14 and causing a short circuit in the circuit board 14. The specific location of the partition 15 is not limited in this application, but two preferred partitioning methods are given: the first is... Figure 1 The partition 15 is placed horizontally inside the main unit 1, the circuit board 14 is placed horizontally inside the second cavity 12, and the motor 13 is placed vertically inside the first cavity 11. That is, the second cavity 12 and the first cavity 11 are arranged vertically, which helps to reduce the radial dimension of the main unit 1; the second type is a reference. Figure 5The partition 15 is placed vertically on one side of the main unit 1, the circuit board 14 is placed vertically in the second cavity 12, and the motor 13 is placed vertically in the first cavity 11. That is, the second cavity 12 and the first cavity 11 are arranged horizontally, which helps to lower the center of gravity of the main unit 1 and improve the working stability of the whole machine.

[0045] Preferably, in this application, the volume ratio V of the second cavity 12 to the first cavity 11 is set between 1 / 5 and 1 / 3, so that both the motor 13 and the circuit board 14 have relatively reasonable installation space. This avoids the situation where the volume ratio V is less than 1 / 5 and the volume of the first cavity 11 accommodating the motor 13 is just right, but the volume of the second cavity 12 is too small, resulting in poor heat dissipation of the circuit board 14 and easy burn-out of electronic components on the circuit board 14 after long-term use. It also avoids the situation where the volume ratio V is greater than 1 / 3 and the volume of the second cavity 12 accommodating the circuit board 14 is just right, but the space for accommodating the motor 13 is too large, resulting in an excessively high overall height and center of gravity of the host 1, affecting the working stability of the host 1, or an excessively large radial width of the host 1, making the motor 13 radially larger and inconvenient for the user to handle.

[0046] Secondly, the layout of components on circuit board 14 was changed to reduce electromagnetic interference, especially the electromagnetic interference that can easily couple from the EMC filter circuit module 141 to the EMC filter circuit module 143, which is prone to high-frequency interference from the MCU to the EMC filter circuit module 141. Specifically, refer to... Figures 1 to 3 In this application, an MCU circuit module 143, a switch circuit module 142, an EMC filter circuit module 141, and a motor drive circuit module 144 are arranged sequentially in a ring along the edge of the circuit board 14. This maximizes the usable area of ​​the circuit board 14, allowing each circuit module to be as large as possible and reducing the difficulty of installing components on each module. Note that the ring arrangement does not necessarily mean a closed loop; it can be an open loop. (See reference...) Figure 3 To explain the sequential arrangement described herein, in a preferred embodiment, the MCU circuit module 143, the switch circuit module 142, the EMC filter circuit module 141, and the motor drive circuit module 144 are arranged in a ring along the clockwise direction of the circuit board, with the four circuit modules connected end to end. Of course, the positions of the MCU circuit module 143 and the EMC filter circuit module 141 can be interchanged, or the positions of the switch circuit module 142 and the motor drive circuit module 144 can be interchanged.

[0047] Third, the MCU circuit module and the EMC filter circuit module are separated, as are the switching circuit module and the EMC circuit module. On one hand, the physical space between the switching circuit module 142 and the motor drive circuit module 144 separates the MCU circuit module 143 and the EMC filter circuit module 141, preventing the transmission of MCU interference signals to the EMC filter circuit module. On the other hand, separating the switching circuit module 142 and the motor drive circuit module 144 increases the physical distance, allowing for greater heat dissipation space for the main heat-generating components in both modules: the switching power supply and the thyristor, preventing heat buildup that could damage the circuit board 14. Specifically, one side of the switching circuit module 142 is adjacent to the MCU circuit module 143, and the other side is adjacent to the EMC filter circuit module 141. This allows the surface-mount filter capacitors in the MCU circuit and the electrolytic filter capacitors in the switching circuit module 142 to first filter and absorb the high-frequency interference signals generated by the food processor. Then, the high-frequency interference signals generated during the operation of the switching circuit module 142 are further filtered and absorbed by the EMC filter circuit module 141. The wiring between the EMC filter circuit module 141 and the switch circuit module 142 is positioned close together to prevent excessive routing from causing electromagnetic interference to other electronic components around the two circuit modules. Simultaneously, since each module is located at the edge of the circuit board 14, the distance between the connection point of the MCU circuit module 143 and the EMC filter circuit module 141 through the center point of the circuit board 14 is maximized. This further prevents high-frequency interference from the MCU between the EMC filter circuit module 141 and the MCU circuit module 143 from coupling to the EMC filter circuit, extending the lifespan of the circuit board 14 installed in the small space of the second cavity 12.

[0048] In other words, in this embodiment, by setting up three levels of anti-interference, it is possible to effectively suppress the high-frequency interference that is easily generated between the EMC filter circuit module 141 and the MCU circuit module 143 on the circuit board 14 and to extend the service life of the circuit board 14, under the premise that the motor 13 and the circuit board 14 are separated by the separator in the host 1 and the installation space of the circuit board 14 is limited.

[0049] It should be noted that, in this application, the edge of the circuit board 14 is at least the area beyond half of the length and width of the circuit board 14.

[0050] In a preferred embodiment, the line connecting the center of the MCU circuit module 143, the center of the EMC filter circuit module 141, and the center of the circuit board is a straight line or nearly a straight line. The MCU circuit module 143 and the EMC filter circuit module are located on opposite sides of the center of the circuit board, i.e., the MCU circuit module 143 and the EMC filter circuit module are arranged opposite each other. Preferably, see reference... Figure 3The circuit board 14 is rectangular, which makes the structure regular and easy to manufacture. The MCU circuit module 143 and EMC filter circuit module 141 are located at two opposite corners of the circuit board 14, and the motor drive circuit module 144 and switch circuit module 142 are located at the remaining two opposite corners of the circuit board 14.

[0051] It should be noted that the rectangle mentioned in this application is not a perfectly regular rectangle in the mathematical sense, but rather refers to the outer contour of the circuit board 14 being roughly rectangular, for example, as shown in the reference. Figure 3 Notches can be provided on the top and bottom edges of the rectangle, or rounded corners can be provided between adjacent sides. Even the edges of the rectangle are not completely horizontal and vertical, but the overall outline of the circuit board 14 is not destroyed.

[0052] Based on this, the distance between the two opposite corners of the rectangle is maximized. Therefore, the MCU circuit module 143 and the EMC filter circuit module 141 are located at the two opposite corners of the circuit board 14, maximizing the distance between them and significantly reducing the risk of high-frequency interference from the MCU between the EMC filter circuit module 141 and the MCU circuit module 143 coupling to the EMC filter circuit. Simultaneously, the distance between the motor drive circuit module 144 and the switching circuit module 142 is also maximized, minimizing the distance between the thyristor in the motor drive circuit module 144 and the switching power supply in the open circuit module 142—two components that generate significant heat during operation—and preventing heat buildup in these components on the circuit board 14 that could damage it.

[0053] Further reference Figure 4 This application also provides a control circuit for controlling an MCU circuit module 143, a switching circuit module 142, an EMC filter circuit module 141, a motor drive circuit module 144, and an interactive circuit module 145. Specifically, the control circuit includes a loop formed by connecting the MCU circuit module 143, the switching circuit module 142, the EMC filter circuit module 141, and the motor drive circuit module 144 in series.

[0054] By setting the MCU circuit module 143, the switch circuit module 142, the EMC filter circuit module 141, and the motor drive circuit module 144 in series, the MCU circuit module 143 and the EMC filter circuit module 141 are separated, increasing the distance between them. This effectively reduces the risk of high-frequency interference from the MCU generated between the EMC filter circuit module 141 and the MCU circuit module 143 being coupled to the EMC filter circuit.

[0055] Furthermore, the control circuit includes a first terminal of the MCU circuit module 143 electrically connected to the second terminal of the switch circuit module 142, a second terminal of the MCU circuit module 143 electrically connected to the first terminal of the motor drive circuit module 144, and a third terminal of the MCU circuit module 143 electrically connected to the interaction circuit module 145.

[0056] In this solution, the third terminal of the EMC filter circuit module 141 is connected to the mains power to prevent interference signals generated during the operation of the food processing machine from entering the mains power and then entering the motor drive circuit module 144 and the switch circuit module 142, which could adversely affect the motor 13 and the switch. For example, it could cause the internal temperature of the motor 13 to rise, damaging the insulation material of the motor 13 and thus shortening the service life of the motor 13, or the interference signals in the mains power could directly damage the motor 13. It could also cause the signal received or output by the switch to be distorted or lost, reducing the accuracy of the switch.

[0057] Furthermore, the control circuit includes a third terminal of the EMC filter circuit module 141 that is electrically connected to the mains power, a first terminal of the EMC filter circuit module 141 that is electrically connected to the second terminal of the motor drive circuit module 144, and a second terminal of the EMC filter circuit module 141 that is electrically connected to the first terminal of the switch circuit module 142.

[0058] In this solution, the third terminal of the EMC filter circuit module 141 is connected to the mains power to prevent interference signals generated during the operation of the food processing machine from entering the mains power and then entering the motor drive circuit module 144 and the switch circuit module 142, which could adversely affect the motor 13 and the switch. For example, it could cause the internal temperature of the motor 13 to rise, damaging the insulation material of the motor 13 and thus shortening the service life of the motor 13, or the interference signals in the mains power could directly damage the motor 13. It could also cause the signal received or output by the switch to be distorted or lost, reducing the accuracy of the switch.

[0059] Specifically, the EMC filter circuit module 141 consists of a fuse, a varistor, an X capacitor, a wire-wound resistor, a color-coded inductor, and an electrolytic capacitor. (See reference...) Figure 4 The above components are arranged in a near-linear pattern on the circuit board 14, making the traces between the components straight and smooth.

[0060] The switching power supply circuit module is used to convert 220V AC power into 5V DC power to provide power to the MCU circuit module 143 and the interactive circuit module 145, etc. The module consists of electrolytic capacitors, diodes, I-type inductors, switching power supply chips, etc.

[0061] The MCU circuit module 143 is used to receive user operations on the UI interface, display the interface, and control the motor 13 to work. This module consists of a microcontroller and filter chip capacitors, etc.

[0062] The motor drive circuit module 144 is used to control the speed and working time of the motor 13. This module consists of a thyristor, a transistor, a current limiting circuit, etc.

[0063] The interactive circuit module 145 is used to display working information. This module consists of digital tubes, LEDs, current limiting circuits, touch buttons, etc.

[0064] Based on the functions of each circuit module, the working principle of the control circuit provided in this application can be analyzed as follows: After the mains power releases 220V AC power, it needs to be converted into 5V DC power by the switching power supply circuit module to power other circuit modules. Then, after the UI interaction circuit receives the user's instruction signal, it is processed by the MCU circuit module and a signal feedback is made so that the interaction circuit module 145 displays the working information through the digital tube. The switching power supply circuit module is located between the EMC filter circuit module 141 and the MCU circuit module 143. During the operation of the motor 13, the filter chip capacitor in the MCU circuit module 143 and the filter electrolytic capacitor in the switching circuit module 142 first perform a first-stage filtering and absorption of the high-frequency interference signal generated by the food processing machine. Then, the high-frequency signal interference generated during the operation of the switching circuit module 142 is filtered and absorbed by the EMC filter circuit module 141, preventing the high-frequency signal from entering the mains power and affecting the operation of other equipment, and preventing signal interference in the mains power from damaging this equipment.

[0065] In a preferred embodiment, to achieve an electrical connection between the circuit board 14 and the motor 13 with the shortest possible connection distance, this application directly provides a through hole 151 on the partition 15 for the wires connecting the circuit board 14 and the motor 13 to pass through. Simultaneously, the through hole 151 is the only path connecting the first cavity 11 and the second cavity 12, drastically reducing the conductive path between the first cavity 11 and the second cavity 12, effectively reducing the amount of carbon powder from the motor 13 splashing onto the circuit board 14.

[0066] However, the above solution, due to the presence of via 151, cannot completely separate the circuit board 14 and the motor 13, and toner may still enter the second cavity 12 through the gap in via 151. Therefore, this application provides several more preferred embodiments:

[0067] Solution 1: Inject fixing glue into via 151. After the glue solidifies, it will seal via 151, completely separating circuit board 14 and motor 13, effectively solving the problem of toner splashing onto circuit board 14.

[0068] Option 2: By installing a seal at the through-hole 151, with a through hole for the power supply wire to pass through, the wall of the through hole tightly wraps around the outside of the wire, thus completely isolating the circuit board 14 and the motor 13. Furthermore, installing the seal is more convenient and offers better maintainability compared to Option 1. It should also be noted that the seal can be a silicone sealing ring. During installation, it can be first fitted onto the through-hole 151, with the wire passing through the through hole in the seal, or the seal can be first fitted onto the wire and then installed together at the through-hole 151.

[0069] In a preferred embodiment, reference is made to Figure 3 , 4 The circuit board 14 also includes an interactive circuit module 145, preferably a UI interactive circuit module. The interactive circuit module 145 is used to display the operating information of the food processor and may have buttons (see reference). Figure 3 KEY101 and KEY100 are used as trigger signals. Specifically, the interactive circuit module 145 is set in the central area of ​​the circuit board 14, and the MCU circuit module 143, the switch circuit module 142, the EMC filter circuit module 141, and the motor drive circuit module 144 are arranged around the interactive circuit module.

[0070] In this embodiment, the interactive circuit module 145 acts as a hardware barrier, further separating the MCU circuit module 143 and the EMC filter circuit module 141 spatially and increasing the physical distance between them. This avoids the problem of high-frequency interference from the MCU coupling to the EMC filter circuit caused by the EMC filter circuit module 141 and the MCU circuit module 143 being too close together. Furthermore, the interactive circuit module 145 acts as a barrier between the switch circuit module 142 and the motor drive circuit module 144, allowing some heat to be absorbed by the interactive circuit module 145. This prevents localized overheating of the circuit board and accelerates its damage. Additionally, placing the interactive circuit module 145 in the central area of ​​the circuit board 14 provides a better user experience when viewing interactive information.

[0071] It should be noted that the interactive circuit module described in this application may also be a module used only for functional display.

[0072] Further reference Figure 1 , 2The interactive circuit module 145 includes indicator lights 1441 and positioning holes 1442 disposed around the indicator lights 1441. Two rows of indicator lights 1441 are arranged, with two positioning holes 1442 disposed between the two rows. The partition 15 is provided with positioning posts 152 that engage with the positioning holes 1442. The positioning posts 152 extend out of the positioning holes 1442 to initially position the circuit board 14 on the partition 15. In this design, the positioning holes 1442 are disposed around the positioning holes 1441 and engage with the positioning posts 152 on the partition 15, ensuring that the presence of the positioning holes 1442 does not affect the arrangement of the indicator lights 1441, while still achieving the positioning and fixing of the circuit board 14 relative to the partition 15.

[0073] In another embodiment, the central area of ​​the circuit board does not have a mechanical switch trigger module. Instead, a microswitch is used for triggering the mechanical switch trigger module. The MCU circuit module 143, the switch circuit module 142, the EMC filter circuit module 141, and the motor drive circuit module 144 surround the mechanical switch trigger module (not shown in the attached figure). Of course, the central area of ​​the circuit board can also be left without any circuit modules, and the mechanical switch trigger module can be moved to the edge of the circuit board, so that the center of the circuit board has a larger heat dissipation area, which is beneficial for the side heat dissipation of each module.

[0074] The technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A small food processing machine with good anti-interference performance, comprising a main unit containing a motor and a circuit board, wherein a partition is provided inside the main unit to divide the inner cavity of the main unit into a first cavity for accommodating the motor and a second cavity for mounting the circuit board, characterized in that, An MCU circuit module, a switch circuit module, an EMC filter circuit module, and a motor drive circuit module are arranged sequentially in a ring along the edge of the circuit board, with the MCU circuit module and the EMC filter circuit module being separated, and the switch circuit module and the EMC circuit module being separated.

2. The small food processing machine with good anti-interference performance according to claim 1, characterized in that, The circuit board has an interactive circuit module in its central area, and the MCU circuit module, switch circuit module, EMC filter circuit module and motor drive circuit module are arranged around the interactive circuit module.

3. The small food processing machine with good anti-interference performance according to claim 2, characterized in that, The interactive circuit module includes an indicator light and a positioning hole that is positioned away from the indicator light. The partition plate is provided with a positioning post that is matched with the positioning hole.

4. The small food processing machine with good anti-interference performance according to claim 1, characterized in that, The circuit board is rectangular, with the MCU circuit module and EMC filter circuit module located at two opposite corners of the circuit board, and the motor drive circuit module and switch circuit module located at the remaining two opposite corners of the circuit board.

5. A small food processing machine with good anti-interference performance according to claim 1, characterized in that, The control circuit of the food processing machine includes a loop formed by the MCU circuit module, the switch circuit module, the EMC filter circuit module, and the motor drive circuit module connected in series.

6. A small food processing machine with good anti-interference performance according to claim 5, characterized in that, The circuit board is also provided with an interactive circuit module. The control circuit includes a first terminal of the MCU circuit module electrically connected to the second terminal of the switch circuit module, a second terminal of the MCU circuit module electrically connected to the first terminal of the motor drive circuit module, and a third terminal of the MCU circuit module electrically connected to the interactive circuit module.

7. A small food processing machine with good anti-interference performance according to claim 5, characterized in that, The control circuit includes a third terminal of the EMC filter circuit module that is electrically connected to the mains power, a first terminal of the EMC filter circuit module that is electrically connected to the second terminal of the motor drive circuit module, and a second terminal of the EMC filter circuit module that is electrically connected to the first terminal of the switch circuit module.

8. A small food processing machine with good anti-interference performance according to claim 1, characterized in that, The partition is provided with a through hole through which the wires connecting the circuit board and the motor pass, and the through hole is the only path connecting the first cavity and the second cavity.

9. A small food processing machine with good anti-interference performance according to claim 8, characterized in that, The via is sealed with adhesive; or... A sealing element is fitted at the through hole, and a through hole is provided on the sealing element for the power supply line to pass through.

10. A small food processing machine with good anti-interference performance according to claim 1, characterized in that, The food processor includes a lid and a cup body with an internal stirring element. The main unit is for holding and is cylindrical in shape. The main unit is detachably mounted on top of the lid, which covers the rim of the cup body. Alternatively, the partition is placed horizontally inside the main unit to separate the second cavity and the first cavity into an upper and lower arrangement. The volume ratio V between the second cavity and the first cavity is between 1 / 5 and 1 / 3.

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