A combined microwave oven

Abstract

The utility model discloses a combined microwave oven, including the body with furnace cavity, be equipped with circuit assembly in the body, circuit assembly includes main control circuit and mechanical timer, be equipped with control panel on the body, be equipped with timing knob and function button on control panel, timing knob with mechanical timer is connected, and mechanical timer is used for controlling the working length of time of microwave oven, main control circuit with function button is connected for adjusting the firepower state of microwave oven according to the control signal of function button input. Adopt the utility model to have the convenient operation effect of mechanical type microwave oven again, and have the accurate firepower gear position control effect of electronic type, and the whole practicality is high, can satisfy the use demand of different users to the maximum.

Description

Technical Field

[0001] This utility model relates to the field of microwave oven technology, and in particular to a combination microwave oven. Background Technology

[0002] Since the invention of the microwave oven, its functions have become increasingly rich and its level of intelligence has increased, but its operation has also become increasingly complex. Currently, electronic microwave ovens use control boards (i.e., circuit boards with microcontroller control functions) to intelligently control the heating time, power level, and automated cooking menus. However, their operation is relatively complex, making them inconvenient for elderly people and users unfamiliar with electronic products, especially regarding the heating time, which often requires adjustment. The electronic control panel of an electronic microwave oven adjusts the heating time through multiple time buttons, such as using 10-minute and 1-minute buttons to adjust the hour, and 10-second and 1-second buttons to adjust the minute. This undoubtedly fails to effectively meet the convenience needs of elderly people and users unfamiliar with electronic products, resulting in significant limitations in the product's usability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a combination microwave oven that has both the convenient operation of a mechanical microwave oven and the precise power level control of an electronic microwave oven, with high overall practicality and can meet the needs of different users to the greatest extent.

[0004] To address the aforementioned technical problems, this utility model provides a combined microwave oven, comprising a body with a cavity, a circuit assembly within the body including a main control circuit and a mechanical timer; a control panel on the body, including a timer knob and function buttons, the timer knob being connected to the mechanical timer for controlling the microwave oven's operating time; and the main control circuit being connected to the function buttons for adjusting the microwave oven's power level based on control signals input from the function buttons.

[0005] As an improvement to the above solution, the main control circuit includes a main controller and a timing detection module. The timing detection module is connected to both the mechanical timer and the main controller, and is used to detect the timing operation status of the mechanical timer and send the status detection information to the main controller. The circuit components include a magnetron assembly. The main controller is connected to the magnetron assembly and is used to control the switching state of the magnetron assembly according to the status detection information. The main controller is connected to the function keys and is used to adjust the operating state of the magnetron assembly according to the control signals input by the function keys.

[0006] As an improvement to the above solution, the circuit assembly further includes a power supply circuit. The input terminal of the power supply circuit is connected to a power supply, and the output terminal of the power supply circuit is connected to the magnetron assembly via the mechanical timer. The mechanical timer controls the on / off state of the power supply circuit of the magnetron assembly. The output terminal of the power supply circuit is also connected to the main control circuit to supply power to the main control circuit.

[0007] As an improvement to the above solution, the main control circuit further includes a step-down power supply module and a relay. The input terminal of the step-down power supply module is connected to the output terminal of the power supply circuit, and the output terminal of the step-down power supply module is connected to the main controller, the relay, and the timing detection module, respectively. The relay is connected to the mechanical timer and the magnetron assembly, respectively, and the control terminal of the relay is connected to the main controller.

[0008] As an improvement to the above solution, the timing detection module is a zero-crossing detection circuit, which includes an optocoupler, a first resistor, a second resistor, a diode, and a capacitor. The input terminals of the optocoupler include a first input pin and a second input pin. The first input pin is connected to one end of the mechanical timer, and the second input pin is connected to the negative terminal of the diode via the first resistor. The positive terminal of the diode is connected to the power supply voltage. The output terminals of the optocoupler include a first output pin and a second output pin. The first output pin is connected to one end of the capacitor and the main controller via the second resistor, and the other end of the capacitor is connected to the second output pin and the ground terminal.

[0009] As an improvement to the above solution, the magnetron assembly includes a magnetron and a voltage multiplier circuit. The voltage multiplier circuit includes a step-up transformer, a high-voltage capacitor, a high-voltage diode, and a current-limiting resistor. The step-up transformer includes a primary coil, a first secondary coil, and a second secondary coil. The two ends of the primary coil are respectively connected to the first output terminal of the power supply circuit and one end of the relay. One end of the first secondary coil is connected to the first electrode of the magnetron. The other end of the secondary coil is respectively connected to the second electrode of the magnetron, one end of the high-voltage capacitor, and the positive terminal of the high-voltage diode. One end of the second secondary coil is connected to the other end of the high-voltage capacitor via the current-limiting resistor. The other end of the high-voltage diode and the negative terminal of the high-voltage diode are both connected to the ground terminal.

[0010] As an improvement to the above solution, the circuit assembly further includes a temperature control switch, which is connected to the first output terminal of the power supply circuit and one end of the magnetron assembly, respectively. The other end of the magnetron assembly is connected to the second output terminal of the power supply circuit via the relay and the mechanical timer in sequence.

[0011] As an improvement to the above solution, the circuit assembly further includes a fan motor module, a bulb module, and a turntable motor module. The fan motor module is connected to the first output terminal of the power supply circuit, one end of the bulb module, and the connection terminal between the mechanical timer and the relay, respectively. The other end of the bulb module is connected to the connection terminal between the mechanical timer and the relay. One end of the turntable motor module is connected to the connection terminal between the temperature control switch and the magnetron assembly, and the other end of the turntable motor module is connected to the connection terminal between the relay and the magnetron assembly, respectively.

[0012] As an improvement to the above solution, the circuit assembly further includes a door interlocking switch group, which includes a primary interlocking switch, a monitoring switch, and a secondary interlocking switch. One end of the primary interlocking switch is connected to the first output terminal of the power supply circuit via the temperature control switch, and the other end of the primary interlocking switch is connected to one end of the magnetron assembly, one end of the monitoring switch, and the connection terminal between the mechanical timer and the relay. The two ends of the secondary interlocking switch are connected to the second output terminal of the power supply circuit and one end of the mechanical timer, respectively, and the other end of the monitoring switch is connected to the connection terminal between the secondary interlocking switch and the mechanical timer.

[0013] As an improvement to the above solution, the control panel is also provided with an indicator light group connected to the main controller, and the indicator light group includes multiple indicator lights.

[0014] The beneficial effects of implementing this utility model are as follows:

[0015] This microwave oven combines a mechanical control panel and timer with an electronic main control circuit. On one hand, the mechanical timer simplifies the circuit structure, eliminating the need for multiple time buttons, making it easy to operate and convenient for elderly users and those unfamiliar with electronics, thus offering high practicality. On the other hand, the main control circuit precisely adjusts the microwave oven's power level based on control signals input from the function buttons, enabling precise control and switching between different power levels to meet the needs of demanding users. Therefore, this invention combines the ease of operation of a mechanical microwave oven with the precise power level control of an electronic one, resulting in high overall practicality and maximizing the satisfaction of diverse user needs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the combined microwave oven of this utility model;

[0017] Figure 2 This is a circuit diagram of the circuit components of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 2 As shown in the figure, a specific embodiment of this utility model provides a combined microwave oven, including a body 1 with a cavity. The body 1 contains a circuit assembly, including a main control circuit 2 and a mechanical timer 3. The body 1 has a control panel 4, which includes a timer knob 41 and function buttons 42, where the function button 42 is a power level switching button. The timer knob 41 is connected to the mechanical timer 3, allowing the user to control the mechanical timer 3 by operating the knob, thereby controlling the microwave oven's operating time and adjusting different heating times. The mechanical timer 3 simplifies the circuit structure, eliminating the need for multiple time buttons, making it easy to operate and convenient for elderly users and those unfamiliar with electronic products, thus offering high practicality. The main control circuit 2 is connected to the function button 42 and is used to adjust the microwave oven's power level based on the control signal input from the function button 42. This allows for precise electronic control of the microwave oven's power level, enabling accurate control and switching between different power levels to meet the needs of demanding users. This invention combines the convenient operation of a mechanical microwave oven with the precise power level control of an electronic one, offering high overall practicality and maximizing the satisfaction of diverse user needs.

[0020] Specifically, the main control circuit 2 includes a main controller 21 and a timing detection module 22, wherein the main controller 21 includes an MCU chip. The timing detection module 22 is connected to the mechanical timer 3 and the main controller 21 respectively, and is used to detect the timing operation status of the mechanical timer 3 and send the status detection information to the main controller 21; the circuit component includes a magnetron component 5, and the main controller 21 is connected to the magnetron component 5, and is used to control the switching state of the magnetron component 5 according to the status detection information. For example, when the mechanical timer 3 is working, the microwave oven's operating circuit is turned on, the timing detection module 22 will detect the timing start status detection information of the mechanical timer 3 and send it to the main controller 21, and the main controller 21 will promptly control the magnetron component 5 to start working, thereby realizing the microwave oven's heating operation with high control accuracy and fast control efficiency.

[0021] Secondly, the main controller 21 is connected to the function button 42 and is used to adjust the working state of the magnetron assembly 5 according to the control signal input by the function button 42. When the user needs to use different power levels of the microwave oven for heating, the user can operate the function button 42 to control the working state of the magnetron assembly 5, thereby switching the microwave oven to the desired power level to meet the user's power needs. For example, each time the mechanical function button 42 is triggered, the corresponding power level of the microwave oven gradually increases or decreases, making operation simple and convenient, meeting the needs of elderly people and users unfamiliar with electronic products.

[0022] Furthermore, the circuit assembly also includes a power supply circuit 6. The input terminal of the power supply circuit 6 is connected to a power supply, and the output terminal of the power supply circuit 6 is connected to the magnetron assembly 5 via the mechanical timer 3. The mechanical timer 3 controls the on / off state of the power supply circuit of the magnetron assembly 5. When the mechanical timer 3 operates on a timer, its switch terminal is turned on, thereby putting the power supply circuit of the magnetron assembly 5 into a conducting state, and the magnetron assembly 5 into a standby state. The main control circuit 2 can then control the magnetron assembly 5 to start operating. The output terminal of the power supply circuit 6 is also connected to the main control circuit 2 to supply power to the main control circuit 2, enabling the main control circuit 2 to power on and operate stably.

[0023] Among them, the power supply circuit 6 is existing technology, and its specific structure can be found in [reference needed]. Figure 2 As shown, I will not go into detail here.

[0024] The main control circuit 2 also includes a step-down power supply module 23 and a relay 24. The input terminal of the step-down power supply module 23 is connected to the output terminal of the power supply circuit 6, and the output terminal of the step-down power supply module 23 is connected to the main controller 21, the relay 24, and the timing detection module 22 respectively to supply power to the main controller 21, the relay 24, and the timing detection module 22. The relay 24 is connected to the mechanical timer 3 and the magnetron assembly 5 respectively, and the control terminal of the relay 24 is connected to the main controller 21. When the mechanical timer 3 operates on a timer, the main controller 21 will control the relay 24 to conduct, thereby powering on the magnetron assembly 5. Furthermore, the main controller 21 can also control the on / off ratio of the relay 24 according to the control signal input by the function button 42 to control the working state of the magnetron assembly 5, thereby switching the power level of the microwave oven.

[0025] The step-down power supply module 23 includes a step-down transformer and a rectifier module. The step-down transformer is connected to the power supply circuit 6 and the rectifier module, respectively. The rectifier module is connected to the main controller 21, the relay 24 and the timing detection module 22, respectively. The step-down transformer converts the high-voltage AC power input to the power supply circuit 6 into low-voltage AC power, and the rectifier module converts the low-voltage AC power into low-voltage DC power, thereby providing stable power to the electrical components in the main control circuit 2.

[0026] To achieve precise timing operation of the magnetron assembly 5, such as Figure 2 As shown, the timing detection module 22 is a zero-crossing detection circuit, which includes an optocoupler OC, a first resistor R1, a second resistor R2, a diode D1, and a capacitor C1. The input terminals of the optocoupler OC include a first input pin and a second input pin. The first input pin is connected to one end of the mechanical timer 3, and the second input pin is connected to the negative terminal of the diode D1 via the first resistor R1. The positive terminal of the diode D1 is connected to the power supply voltage. The output terminals of the optocoupler OC include a first output pin and a second output pin. The first output pin is connected to one end of the capacitor C1 and the main controller 21 via the second resistor R2, and the other end of the capacitor C1 is connected to the second output pin and the ground terminal. When the mechanical timer 3 operates, its switch terminal is closed, and a signal is generated at the mechanical timer 3. After detecting the signal at the input terminal of the optocoupler OC, its output terminal outputs a signal to the main controller 21. The main controller 21 precisely controls the relay 24 to conduct the power supply circuit between the mechanical timer 3 and the magnetron assembly 5. At this time, the magnetron assembly 5 is powered on and operates, realizing the heating operation of the microwave oven. Conversely, when the mechanical timer 3 finishes timing, its switch opens, and the input of the optocoupler OC will not detect the corresponding signal. At this time, the main controller 21 controls the relay 24 to disconnect, thereby controlling the magnetron assembly 5 to stop working and achieving precise control processing of the magnetron assembly 5.

[0027] Preferably, the optocoupler OC is EL817C, but this is not a limitation.

[0028] Furthermore, such as Figure 2As shown, the magnetron assembly 5 includes a magnetron 51 and a voltage multiplier circuit. The voltage multiplier circuit includes a step-up transformer 52, a high-voltage capacitor C2, a high-voltage diode D2, and a current-limiting resistor R3. The step-up transformer 52 includes a primary coil, a first-stage coil, and a second-stage coil. The two ends of the primary coil are connected to the first output terminal of the power supply circuit 6 and one end of the relay 24, respectively. One end of the first-stage coil is connected to the first electrode of the magnetron 51. The other end of the second-stage coil is connected to the second electrode of the magnetron 51, one end of the high-voltage capacitor C2, and the positive terminal of the high-voltage diode D2, respectively. One end of the second-stage coil is connected to the other end of the high-voltage capacitor C2 via the current-limiting resistor R3. The other end and the negative terminal of the high-voltage diode D2 are both connected to ground. The voltage multiplier circuit described above can stably boost the input voltage to the operating voltage required by the magnetron 51, enabling the magnetron 51 to stably operate for microwave heating.

[0029] To provide over-temperature protection for circuit components, such as Figure 2 As shown, the circuit assembly also includes a temperature control switch K4, which is connected to the first output terminal of the power supply circuit 6 and one end of the magnetron assembly 5. The other end of the magnetron assembly 5 is connected to the second output terminal of the power supply circuit 6 via the relay 24 and the mechanical timer 3. When the microwave oven's circuit temperature is too high, the temperature control switch K4 will automatically disconnect the power supply circuit 6 to ensure the safety of the components in the circuit assembly and prevent the components or the microwave oven from burning out due to overheating, thus ensuring high safety in use.

[0030] Furthermore, the circuit assembly also includes a fan motor module FM, a bulb module OL, and a turntable motor module TM. The fan motor module FM is connected to the first output terminal of the power supply circuit 6, one end of the bulb module OL, and the connection terminal between the mechanical timer 3 and the relay 24. The other end of the bulb module OL is connected to the connection terminal between the mechanical timer 3 and the relay 24. One end of the turntable motor module TM is connected to the connection terminal between the temperature control switch K4 and the magnetron assembly 5. The other end of the turntable motor module TM is connected to the connection terminal between the relay 24 and the magnetron assembly 5. When the mechanical timer 3 operates, the power supply circuit 6 is closed, and the magnetron assembly 5, fan motor module FM, bulb module OL, and turntable motor module TM will be powered on to perform microwave heating and other auxiliary functions. For example, the fan motor module FM is used to dissipate heat from the microwave oven, the bulb module OL is used to illuminate the oven cavity, and the turntable motor module TM is used to rotate the turntable in the oven cavity to achieve material rotation.

[0031] To improve the safety of microwave oven use, such as Figure 2 As shown, the circuit assembly also includes a door interlocking switch group 7, which includes a primary interlocking switch K1, a monitoring switch K2, and a secondary interlocking switch K3. One end of the primary interlocking switch is connected to the first output terminal of the power supply circuit 6 via the temperature control switch K4, and the other end of the primary interlocking switch is connected to one end of the magnetron assembly 5, one end of the monitoring switch K2, and the connection terminal between the mechanical timer 3 and the relay 24. The two ends of the secondary interlocking switch K3 are connected to the second output terminal of the power supply circuit 6 and one end of the mechanical timer 3, respectively, and the other end of the monitoring switch K2 is connected to the connection terminal between the secondary interlocking switch K3 and the mechanical timer 3. The entire interlocking switch group is controlled by the door. When the door is open, the primary interlock switch K1 and the secondary interlock switch K3 are open, and the monitoring switch K2 is closed. At this time, except for the main control circuit 2 which monitors standby operation, the power supply circuits of all other electrical components are disconnected, and none of them can be powered on or operated, so the microwave oven cannot start. When the door is closed, the primary interlock switch K1 and the secondary interlock switch K3 are closed, and the monitoring switch K2 is open. At this time, the power supply circuits of all electrical appliances are connected, and the microwave oven can start and operate. This door interlocking switch group 7 can ensure the safe operation of the microwave oven and improve its safety.

[0032] Preferably, such as Figures 1 to 2 As shown, the control panel 4 is also equipped with a group of indicator lights 43 connected to the main controller 21. The group of indicator lights 43 includes multiple indicator lights 43 to indicate different functions. For example, multiple indicator lights 43 can be set to indicate different power levels, so that users can clearly understand what power state the microwave oven is operating in, thus facilitating user operation and adjustment.

[0033] In summary, this microwave oven combines a mechanical control panel and timer with an electronic main control circuit. On one hand, the mechanical timer simplifies the circuit structure, eliminating the need for multiple time buttons, making operation simple and convenient for the elderly and users unfamiliar with electronic products, thus offering high practicality. On the other hand, the main control circuit with its own controller can precisely adjust the microwave oven's power level based on the control signals input from the function buttons, achieving precise control and switching between different power levels to meet the needs of demanding users. Therefore, this invention combines the convenient operation of a mechanical microwave oven with the precise power level control of an electronic one, resulting in high overall practicality and maximizing the satisfaction of diverse user needs.

[0034] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A combined microwave oven, characterized in that, The machine includes a body with a furnace cavity, and the body is equipped with a circuit assembly, which includes a main control circuit and a mechanical timer; The body is equipped with a control panel, which has a timer knob and function buttons. The timer knob is connected to the mechanical timer, which is used to control the working time of the microwave oven. The main control circuit is connected to the function buttons and is used to adjust the power state of the microwave oven according to the control signals input by the function buttons. The main control circuit includes a main controller and a timing detection module. The timing detection module is connected to the mechanical timer and the main controller respectively, and is used to detect the timing working status of the mechanical timer and send the status detection information to the main controller. The circuit assembly includes a magnetron assembly, and the main controller is connected to the magnetron assembly for controlling the switching state of the magnetron assembly according to the state detection information; The main controller is connected to the function key and is used to adjust the working state of the magnetron assembly according to the control signal input by the function key. The timing detection module is a zero-crossing detection circuit, which includes an optocoupler, a first resistor, a second resistor, a diode, and a capacitor. The input terminal of the optocoupler includes a first input pin and a second input pin. The first input pin is connected to one end of the mechanical timer, and the second input pin is connected to the negative terminal of the diode via the first resistor. The positive terminal of the diode is connected to the power supply voltage. The output terminal of the optocoupler includes a first output pin and a second output pin. The first output pin is connected to one end of the capacitor and the main controller via the second resistor. The other end of the capacitor is connected to the second output pin and the ground terminal.

2. The combined microwave oven as described in claim 1, characterized in that, The circuit assembly also includes a power supply circuit, the input terminal of which is connected to a power supply, and the output terminal of which is connected to the magnetron assembly via the mechanical timer. The mechanical timer controls the on / off state of the power supply circuit of the magnetron assembly. The output terminal of the power supply circuit is also connected to the main control circuit to supply power to the main control circuit.

3. The combined microwave oven as described in claim 2, characterized in that, The main control circuit also includes a step-down power supply module and a relay. The input terminal of the step-down power supply module is connected to the output terminal of the power supply circuit, and the output terminal of the step-down power supply module is connected to the main controller, the relay and the timing detection module respectively. The relay is connected to the mechanical timer and the magnetron assembly respectively, and the control terminal of the relay is connected to the main controller.

4. The combined microwave oven as described in claim 3, characterized in that, The magnetron assembly includes a magnetron and a voltage multiplier circuit. The voltage multiplier circuit includes a step-up transformer, a high-voltage capacitor, a high-voltage diode, and a current-limiting resistor. The step-up transformer includes a primary coil, a first-stage coil, and a second-stage coil. The two ends of the primary coil are respectively connected to the first output terminal of the power supply circuit and one end of the relay. One end of the primary coil is connected to the first electrode of the magnetron, and the other end of the secondary coil is connected to the second electrode of the magnetron, one end of the high-voltage capacitor, and the positive electrode of the high-voltage diode. One end of the secondary coil is connected to the other end of the high-voltage capacitor via the current-limiting resistor, and the other end of the high-voltage diode and the negative electrode of the high-voltage diode are both connected to the ground terminal.

5. The combined microwave oven as described in claim 3, characterized in that, The circuit assembly also includes a temperature control switch, which is connected to the first output terminal of the power supply circuit and one end of the magnetron assembly, respectively. The other end of the magnetron assembly is connected to the second output terminal of the power supply circuit via the relay and the mechanical timer in sequence.

6. The combined microwave oven as described in claim 5, characterized in that, The circuit assembly also includes a fan motor module, a bulb module, and a turntable motor module. The fan motor module is connected to the first output terminal of the power supply circuit, one end of the bulb module, and the connection terminal between the mechanical timer and the relay, respectively. The other end of the bulb module is connected to the connection terminal between the mechanical timer and the relay. One end of the turntable motor module is connected to the connection end between the temperature control switch and the magnetron assembly, and the other end of the turntable motor module is connected to the connection end between the relay and the magnetron assembly.

7. The combined microwave oven as described in claim 5, characterized in that, The circuit assembly also includes a door linkage switch group, which includes a primary interlock switch, a monitoring switch, and a secondary interlock switch. One end of the primary interlocking switch is connected to the first output terminal of the power supply circuit via the temperature control switch, and the other end of the primary interlocking switch is connected to one end of the magnetron assembly, one end of the monitoring switch, and the connection terminal between the mechanical timer and the relay. The two ends of the secondary interlocking switch are respectively connected to the second output terminal of the power supply circuit and one end of the mechanical timer, and the other end of the monitoring switch is connected to the connection terminal between the secondary interlocking switch and the mechanical timer.

8. The combined microwave oven as described in claim 1, characterized in that, The control panel is also equipped with an indicator light group connected to the main controller, and the indicator light group includes multiple indicator lights.

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