Power supply filter board integrated with motor driving circuit and cooking equipment

Abstract

The utility model provides a power supply filter board integrated with a motor drive circuit and cooking equipment, the power supply filter board comprises a motor drive module and a power supply filter protection module, and the motor drive module and the power supply filter protection module are integrated on the power supply filter board. One ends of the motor driving module and the power supply filtering protection module are connected with the control panel, and the other ends of the motor driving module and the power supply filtering protection module are respectively connected with the mains supply input and the direct current fan motor; wherein an electrical isolation groove is arranged between the motor driving module and the power supply filtering protection module; according to the power supply filter board integrated with the motor driving circuit and the cooking equipment, the structure of the motor driving circuit can be effectively optimized, so that the motor driving circuit can be integrated on the power supply filter board, the space occupied by the motor driving circuit and the power supply filter board in the cooking equipment is reduced, the heat dissipation efficiency is enhanced, and the service life of the cooking equipment is prolonged. The installation cost is reduced, and the product reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of cooking household appliances technology, specifically to a power filter board and cooking equipment with integrated motor drive circuit. Background Technology

[0002] Existing cooking appliances such as microwave ovens, microwave-steam-grill combos, and electric ovens have fans installed inside the cavity to accelerate the circulation of hot air, promote the even distribution of hot air, remove moisture from the surface of food in time, improve heat transfer efficiency, and allow food to be heated evenly and form a crispy texture, thereby shortening cooking time.

[0003] Currently, the drive circuit for DC fan motors is usually set up independently, with a separate circuit board to drive the fan motor. However, this approach has some obvious drawbacks:

[0004] On the one hand, the independent drive circuit board increases the space occupied inside the device, making the internal space layout of the cooking device less compact and not conducive to the miniaturization design of the device.

[0005] On the other hand, independent driver circuit boards require additional installation procedures and materials, increasing the product's production and installation costs.

[0006] Furthermore, connecting multiple circuit boards requires numerous connecting cables and interfaces, increasing the likelihood of circuit failures and reducing product reliability. Therefore, researching how to reduce the size of the driver circuit board within the device while simultaneously lowering production costs and improving product reliability is of great significance.

[0007] Patent publication number CN116300553A discloses a controller, method, device, electronic device, and medium for a motion mechanism, including a controller suitable for a control panel of a rail transit vehicle. The controller comprises a main control unit, an electrical isolation unit, and a motor drive module. The electrical isolation unit is installed between the main control unit and the motor drive module. The motor drive module is electrically connected to the main control unit. The main control unit controls the polarity of the DC power output by the motor drive module. A brushless DC motor is used to change the state of the control panel. This design integrates the main control unit and the motor drive module, and electrically isolates the two parts, improving the product's integration and anti-interference capabilities. It meets the installation space requirements below the control panel and also satisfies motor control requirements. However, because it is required for controlling a motion mechanism, its structure requires numerous communication interfaces, resulting in a complex overall structure and higher cost. Utility Model Content

[0008] In view of this, the present invention aims to propose a power filter board and cooking equipment with an integrated motor drive circuit, in order to solve the problems of existing independently set DC fan motor drive circuits, which tend to increase the space occupied inside the equipment, the production and installation costs, and require more connecting wires and interfaces, which increases the probability of circuit failure and reduces the reliability of the equipment. Even with the integrated main control unit and motor drive module, the controller structure is still relatively complex. The present invention optimizes the structure of the motor drive circuit, enabling it to be integrated into the power filter board, reducing the space occupied by the motor drive circuit and the power filter board inside the cooking equipment, enhancing heat dissipation efficiency, reducing installation costs, and improving product reliability.

[0009] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0010] This utility model relates to a power filter board with an integrated motor drive circuit and a cooking device. The power filter board with the integrated motor drive circuit includes a motor drive module and a power filter protection module, which are integrated on the power filter board. One end of the motor drive module and the power filter protection module are connected to a control board, and the other end of the motor drive module and the power filter protection module are respectively connected to the mains power input and the DC fan motor. An electrical isolation slot is provided between the motor drive module and the power filter protection module.

[0011] Furthermore, the motor drive module includes a power input interface, a switching power supply circuit, a motor drive chip, and a motor wiring harness interface; one end of the power input interface is connected to the motor wiring harness interface via the switching power supply circuit, the motor drive chip, and the motor wiring harness interface in sequence; the other end of the power input interface is connected to the control board; and the other end of the motor wiring harness interface is connected to the DC fan motor.

[0012] Furthermore, the power filtering and protection module includes a fuse, an anti-interference component, an overvoltage protection component, and a common-mode inductor; one end of the fuse is connected to the current output terminal of the mains input through the mains input interface, and the other end of the fuse is connected to one end of the power output interface in sequence through the anti-interference component, the overvoltage protection component, and the common-mode inductor; the other end of the power output interface is connected to the control board; the mains input interface is connected to the anti-interference component, the overvoltage protection component, and the power output interface respectively.

[0013] Furthermore, the anti-interference component includes an X capacitor and a Y capacitor; one end of the X capacitor is connected to a fuse, and the other end of the X capacitor is connected to an overvoltage protection component through the Y capacitor.

[0014] Furthermore, at least one Y capacitor is provided.

[0015] Furthermore, two Y capacitors are provided; the two Y capacitors are Y capacitor one and Y capacitor two; both ends of Y capacitor one and Y capacitor two are respectively connected to the X capacitor and the overvoltage protection component, and the other end of Y capacitor one is connected to the other end of Y capacitor two, the mains input interface and the power output interface.

[0016] Furthermore, the overvoltage protection component is a varistor.

[0017] Furthermore, at least one varistor should be provided.

[0018] Furthermore, three varistors are provided, namely varistor 1, varistor 2, and varistor 3. Varistor 1 is connected to varistor 2, Y capacitor 1, varistor 3, AC input interface, and power output interface, respectively. Varistor 2 is connected to Y capacitor 2 and varistor 3, respectively.

[0019] A cooking device, the device including a power filter board of an integrated motor drive circuit, the power filter board being disposed within the cooking device.

[0020] Compared with the prior art, the power filter board and cooking device with integrated motor drive circuit of this utility model have the following advantages:

[0021] By integrating the DC fan motor drive circuit onto the power filter board of the household appliance, the structure of the motor drive circuit can be effectively optimized, allowing it to be integrated onto the power filter board. This optimizes the spatial layout of the motor drive circuit and the power filter board within the cooking equipment, reduces the space occupied by the motor drive circuit and the power filter board, enhances heat dissipation efficiency, reduces installation costs, and improves product reliability. Attached Figure Description

[0022] The accompanying drawings, which constitute a part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments and descriptions of the utility model are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the connection structure between the motor drive circuit board and the control board in the prior art.

[0024] Figure 2 This is a schematic diagram of the overall structure of the power filter board control system in this application;

[0025] Figure 3 A schematic diagram of the functional components inside a power filter board that integrates a motor drive circuit;

[0026] Figure 4 This is a schematic diagram of the installation of a power filter board for an integrated motor drive circuit.

[0027] Explanation of reference numerals in the attached drawings: 1. Motor drive module; 11. Power input interface; 12. Switching power supply circuit; 13. Motor drive chip; 14. Motor wiring harness interface; 2. Power filtering and protection module; 21. Fuse; 22. Anti-interference component; 23. Overvoltage protection component; 24. Common mode inductor; 3. Electrical isolation slot; 4. Housing; 5. Connector; 6. Wiring harness; 7. Cooking cavity. Detailed Implementation

[0028] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to convey the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] This embodiment is for cooking equipment. Similar to conventional cooking equipment, the overall structure consists of a fan, a fan motor, a heating device, and a housing.

[0033] In existing technologies, the drive circuit for DC fan motors is usually set up independently, and the specific setting method is as follows: Figure 1As shown, the cooking equipment includes a DC fan motor, motor wiring harness, motor drive circuit, power supply and control wiring harness, connectors, and a control board. The DC fan motor is connected to the control board sequentially via the motor wiring harness, motor drive circuit, power supply and control wiring harness, and connectors. The DC fan motor is the system's power source, driving the fan to achieve ventilation and heat dissipation. The motor wiring harness transmits current and connects the motor to the drive circuit. The motor drive circuit controls the motor, such as adjusting its rotation direction and speed. The power supply and control wiring harness supplies power to the system and transmits control signals. The connectors are used for electrical connections between components, facilitating assembly and disassembly. The control board controls and monitors the entire system. However, in existing technologies, the motor drive circuit module typically requires heat-shrink tubing encapsulation for electrical isolation, which suffers from poor heat dissipation, unstable mounting, and susceptibility to heat sources and magnetic field interference during operation.

[0034] To address the issues of existing technologies where independently configured DC fan motor drive circuits increase space requirements, production and installation costs, and necessitate more wiring and interfaces, thus increasing the probability of circuit failures and reducing operational reliability, and even integrated control unit and motor drive module designs still suffer from complex controller structures, this embodiment proposes a power filter board and cooking equipment with an integrated motor drive circuit. The power filter board includes a motor drive module 1 and a power filter protection module 2, integrated on the power filter board. One end of each module is connected to a control board, and the other ends are connected to the mains input and the DC fan motor, respectively. An electrical isolation slot 3 is provided between the motor drive module 1 and the power filter protection module 2. Furthermore, the control board serves as the core of the entire power filter board control system. Powered by the power filter board, the control board is responsible for the system function control of the cooking equipment, including the drive control of the DC fan motor. Specifically, the control board controls the power supply, direction, and speed of the fan motor.

[0035] By incorporating a power filter board, the structure of the motor drive circuit can be optimized, allowing it to be integrated onto the power filter board. In this application, the main function of the power filter protection module 2 is to filter the input power, remove interference signals, and provide protection against overvoltage, short circuits, etc.; the motor drive module 1 is used to drive the DC fan motor. This combined design helps reduce the space occupied by the motor drive circuit and the power filter board inside the cooking equipment, enhances heat dissipation efficiency, reduces installation costs, and improves product reliability. Furthermore, the entire power filter board also provides a stable and clean power supply to the motor and other equipment, and assists in the drive control of the motor.

[0036] The power supply filter board includes a filtering protection functional area and a motor drive functional area, with a gap between them. An electrical isolation slot 3 is disposed within this gap. Motor drive module 1 is located within the motor drive functional area, and power supply filtering protection module 2 is located within the filtering protection functional area. For details on the different functional areas and internal components of the power supply filter board, please refer to [link to relevant documentation]. Figure 3 As shown.

[0037] By placing the electrical isolation slot 3 between the filtering protection functional area where the power supply filtering protection module 2 is located and the motor drive functional area where the motor drive module 1 is located, it can be used to electrically isolate the filtering protection area and the motor drive functional area to prevent mutual interference.

[0038] The motor drive module 1 includes a power input interface 11, a switching power supply circuit 12, a motor drive chip 13, and a motor wiring harness interface 14. The power input interface 11, switching power supply circuit 12, motor drive chip 13, and motor wiring harness interface 14 are all located within the motor drive functional area. One end of the power input interface 11 is connected sequentially to one end of the motor wiring harness interface 14 via the switching power supply circuit 12 and the motor drive chip 13. The other end of the power input interface 11 is connected to the control board; the other end of the motor wiring harness interface 14 is connected to the DC fan motor.

[0039] By configuring the modules within the power drive module 1, control signals from the control board can be effectively received in real time, driving the DC fan motor. Specifically, the power input interface 11 receives the filtered power supply generated by the control board's switching mechanism, performs voltage conversion via the switching power supply circuit 12, and then controls the DC fan motor's operation via the motor drive chip 13 and motor wiring harness interface 14, thereby achieving real-time drive of the DC fan motor. Unlike independently configured motor drive circuits, this application integrates the various modules of the motor drive circuit onto the power filter board. On one hand, this reduces the number of independent drive circuit boards, effectively minimizing the space occupied by the DC fan motor drive circuit within the cooking equipment. This results in a more compact internal layout for the microwave oven or electric oven, facilitating miniaturization and optimizing the internal space of the cooking equipment. On the other hand, reducing the use of independent drive circuit boards correspondingly reduces installation steps and materials, lowering production and installation costs. Furthermore, it reduces the connections between different functional circuit boards, decreasing the number of connecting wires and interfaces used, reducing the likelihood of circuit failures, and improving product reliability.

[0040] The power filtering and protection module 2 includes a fuse 21, an anti-interference component 22, an overvoltage protection component 23, and a common-mode inductor 24. One end of the fuse 21 is connected to the current output terminal of the mains input via the mains input interface. The other end of the fuse 21 is connected to one end of the power output interface via the anti-interference component 22, the overvoltage protection component 23, and the common-mode inductor 24 in sequence. The other end of the power output interface is connected to the control board. The mains input interface is connected to the anti-interference component 22, the overvoltage protection component 23, and the power output interface. The power output interface is used to output power to the control board.

[0041] Through the combined action of the components within the power supply filtering and protection module 2, the control board is effectively powered, ensuring the stability and safety of the output power. It also filters the input power, removing interference signals and providing protection against overvoltage, short circuits, etc. The fuse 21 provides overcurrent protection, improving the operational safety and reliability of the power supply filtering board. The anti-interference component 22 helps suppress common-mode and differential-mode interference in the circuit. The common-mode inductor 24 is used to suppress common-mode interference.

[0042] The anti-interference component 22 includes an X capacitor and a Y capacitor. One end of the X capacitor is connected to the fuse 21, and the other end of the X capacitor is connected to the overvoltage protection component 23 via the Y capacitor. At least one Y capacitor is provided. Preferably, two Y capacitors are provided. The two Y capacitors are Y capacitor one and Y capacitor two. Both ends of Y capacitor one and Y capacitor two are connected to the X capacitor and the overvoltage protection component 23, respectively. The other end of Y capacitor one is connected to the other end of Y capacitor two, the mains input interface, and the power output interface, respectively.

[0043] By using the X capacitor, differential-mode interference can be suppressed. The Y capacitor, on the other hand, can suppress common-mode interference. The combined use of the X and Y capacitors improves the anti-interference capability of the power supply filter protection module 2, enhances its filtering capacity, and improves the reliability and safety of the power supply filter board.

[0044] In addition, the overvoltage protection component 23 is a varistor, and at least one varistor is provided. Preferably, three varistors are provided, including varistor one, varistor two, and varistor three. Varistor one is connected to varistor two, Y capacitor one, varistor three, AC input interface, and power output interface, respectively. Varistor two is connected to Y capacitor two and varistor three, respectively.

[0045] By setting each varistor, the circuit of the power supply filter protection module 2 can be effectively protected, enhancing the safety and operational stability of the circuit, preventing damage to components caused by overvoltage, which helps to improve the service life of the circuit, reduce the cost of the circuit, and enhance the reliability of the circuit.

[0046] A cooking device includes a power filter board with an integrated motor drive circuit; the power filter board is disposed within the cooking device. The device also includes a housing 4, a connector 5, a wiring harness 6, a DC fan motor, and a cooking cavity 7. The cooking cavity 7 is disposed inside the housing 4, and the DC fan motor is disposed at the top or rear of the cooking cavity 7. One end of the wiring harness 6 is connected to the DC fan motor, and the other end of the wiring harness 6 is connected to the power filter board via the connector 5. The power filter board is disposed within the power input area inside the housing 4. At least one DC fan motor is provided. The power filter board is fixed to the power input area of ​​the cooking device by clips and / or screws. In this embodiment, the clips are made of plastic. The power draw point for the motor drive module 1 is located near the power filtering protection module 2. The length of the wiring harness 6 is greater than or equal to the distance between the DC fan motor and the power filter board inside the cooking device.

[0047] By optimizing the layout of components within the cooking equipment, the space utilization rate can be improved, thus reducing costs. Specifically, the placement of the power filter board in the power input area ensures good ventilation and efficient heat dissipation. The proximity of the power source to the power filter protection module 2 within the motor drive module 1 facilitates its EMC (Electromagnetic Compatibility) testing. Furthermore, the DC fan motor is connected to the output terminal (power input interface 11) of the drive circuit on the power filter board via wiring harness 6. The length of wiring harness 6 is adapted to the distance between the DC fan motor and the power filter board, enhancing the flexibility of component placement. Adjusting the length of wiring harness 6 based on the positions of the power filter board and DC fan motor reduces tangling, lowering costs and preventing messy wiring. This improves operational safety and reliability, simplifies maintenance, and enhances user safety.

[0048] In this utility model, any cooking device may include the power filter board structure with integrated motor drive circuit described in this embodiment. Based on the relevant structure and assembly relationship of the motor drive module 1 and the power filter protection module 2 provided in this embodiment, the cooking device also includes conventional components such as a fan, a fan motor, a heating device, and a housing 4. Since these are all prior art, they will not be described in detail here.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power filter board for integrated motor drive circuits, characterized by, The application relates to an integrated motor driving circuit power filter board, which comprises a motor driving module (1) and a power filter protection module (2), wherein the motor driving module (1) and the power filter protection module (2) are integrally arranged on a power filter board, one end of the motor driving module (1) and the power filter protection module (2) is connected with a control board, and the other end of the motor driving module (1) and the power filter protection module (2) is respectively connected with a commercial power input and a direct-current fan motor; an electrical isolation groove (3) is arranged between the motor driving module (1) and the power filter protection module (2).

2. The power filter board of an integrated motor drive circuit according to claim 1, wherein, The motor driving module (1) comprises a power input interface (11), a switching power supply circuit (12), a motor driving chip (13) and a motor wire harness interface (14); one end of the power input interface (11) is connected with one end of the motor wire harness interface (14) through the switching power supply circuit (12) and the motor driving chip (13) in sequence; the other end of the power input interface (11) is connected with the control board; and the other end of the motor wire harness interface (14) is connected with the direct-current fan motor.

3. The power filter board of claim 1, wherein, The power filter protection module (2) comprises a fuse (21), an anti-interference component (22), an overvoltage protection component (23) and a common mode inductor (24); one end of the fuse (21) is connected with a current output end of the commercial power input through a commercial power input interface, the other end of the fuse (21) is connected with one end of a power output interface through the anti-interference component (22), the overvoltage protection component (23) and the common mode inductor (24) in sequence; the other end of the power output interface is connected with the control board; and the commercial power input interface is connected with the anti-interference component (22), the overvoltage protection component (23) and the power output interface.

4. The power filter board of claim 3, wherein, The anti-interference component (22) comprises an X capacitor and a Y capacitor; one end of the X capacitor is connected with the fuse (21), and the other end of the X capacitor is connected with the overvoltage protection component (23) through the Y capacitor.

5. The power filter board of an integrated motor drive circuit according to claim 4, wherein, The Y capacitor is provided with at least one.

6. The power filter board of an integrated motor drive circuit according to claim 5, wherein, The Y capacitor is provided with two; the two Y capacitors are Y1 capacitor and Y2 capacitor; two ends of the Y1 capacitor and the Y2 capacitor are respectively connected with the X capacitor and the overvoltage protection component (23), and the other end of the Y1 capacitor is respectively connected with the other end of the Y2 capacitor, the commercial power input interface and the power output interface.

7. The power filter board of an integrated motor drive circuit according to claim 3, wherein, The overvoltage protection component (23) is a pressure-sensitive resistor.

8. The power filter panel of claim 7, wherein, The pressure-sensitive resistor is provided with at least one.

9. The power filter panel of claim 8, wherein, The pressure-sensitive resistor is provided with three, and the three pressure-sensitive resistors comprise a pressure-sensitive resistor 1, a pressure-sensitive resistor 2 and a pressure-sensitive resistor 3; the pressure-sensitive resistor 1 is respectively connected with the pressure-sensitive resistor 2, the Y1 capacitor, the pressure-sensitive resistor 3, the commercial power input interface and the power output interface; and the pressure-sensitive resistor 2 is connected with the Y2 capacitor and the pressure-sensitive resistor 3.

10. A cooking apparatus, characterized by, The device comprises the power filter board of the integrated motor driving circuit according to any one of claims 1-9, and the power filter board is arranged in a cooking device.

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