Control circuit of microwave oven

Abstract

The utility model relates to the technical field of microwave ovens, in particular to a control circuit of a microwave oven, which comprises a magnetron used for generating microwaves to heat food; the first controller is provided with a first output end and a first feedback end; the second controller is provided with a signal receiving end and a control end; the signal receiving end of the second controller is connected with the first output end, and the control end of the second controller is connected with the magnetron; one end of the sampling detection assembly is connected with the magnetron, and the other end of the sampling detection assembly is connected with the first feedback end. According to the embodiment of the invention, the sampling detection assembly is arranged, the sampling detection assembly can directly collect the working parameters of the magnetron, and then the sampling detection assembly transmits the collected parameters to the first controller in a signal form, so that the first controller can control the running state of the magnetron in time; therefore, the overall real-time dynamic response effect of the equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of microwave oven technology, specifically to a control circuit for a microwave oven. Background Technology

[0002] Currently, in traditional microwave ovens, communication between the inverter and the control board is achieved through two optocouplers: one for transmitting and converting the transmitted signal, and the other for receiving and converting the received signal. Because the control board does not directly acquire the operating status information of the magnetron in the inverter, but rather obtains and identifies this information through the inverter's control chip, and then transmits it to the control board's main control chip via the optocouplers, the control board cannot promptly monitor the magnetron's operating status, resulting in poor overall real-time dynamic response of the equipment. Utility Model Content

[0003] In view of this, the present invention provides a control circuit for a microwave oven to solve the problem of poor overall real-time dynamic response of the device.

[0004] In a first aspect, this utility model provides a control circuit for a microwave oven, the control circuit comprising:

[0005] Magnetrons are used to generate microwaves to heat food;

[0006] The first controller is equipped with a first output terminal and a first feedback terminal;

[0007] The second controller is equipped with a signal receiving end and a control end; the signal receiving end of the second controller is connected to the first output end, and the control end of the second controller is connected to the magnetron.

[0008] The sampling and detection component has one end connected to the magnetron and the other end connected to the first feedback terminal; the sampling and detection component is used to collect the operating parameters of the magnetron.

[0009] Beneficial effects: This embodiment is equipped with a sampling and detection component, which can directly collect the operating parameters of the magnetron. Then, the sampling and detection component transmits the collected parameters to the first controller in the form of a signal. Compared with the multiple signal conversions of the optocoupler, the first controller can promptly grasp the operating status of the magnetron, thereby improving the overall real-time dynamic response of the device.

[0010] In one alternative implementation, the sampling detection component includes:

[0011] The detection circuit and sampling circuit are connected in series. The other end of the detection circuit is connected to the first feedback terminal, and the other end of the sampling circuit is connected to the magnetron. The sampling circuit is used to collect the operating parameters of the magnetron.

[0012] In one alternative implementation, the detection circuit includes:

[0013] The rectifier diode has its cathode connected to the first feedback terminal and its anode connected to the sampling circuit.

[0014] The filter capacitor has one end connected to the first feedback terminal and the other end grounded.

[0015] In one optional implementation, the detection circuit further includes:

[0016] The discharge resistor has one end connected to the first feedback terminal and the other end grounded.

[0017] In one optional implementation, the detection circuit further includes:

[0018] Clamping voltage;

[0019] The clamping diode has its cathode connected to the clamping voltage and its anode connected to the first feedback terminal.

[0020] Beneficial effects: This embodiment sets up a clamping voltage and a clamping diode, which can clamp and protect the first controller, preventing damage to the first controller caused by the high voltage of the feedback voltage signal from the sampling and detection component. When the voltage value is high, the clamping diode conducts, thereby limiting the voltage applied to the first feedback terminal to the forward conduction voltage drop of the clamping diode, which will not exceed the safe value, thus protecting the first controller.

[0021] In one optional implementation, the control circuit further includes:

[0022] The power converter is equipped with an information feedback terminal, a signal input terminal, and a voltage output terminal; the information feedback terminal is connected to the second feedback terminal of the second controller, the signal input terminal is connected to the control terminal of the second controller, and the voltage output terminal of the power converter is connected to the magnetron.

[0023] In one optional implementation, the power converter further includes a detection terminal, which is connected to the other end of a sampling circuit; the sampling circuit includes:

[0024] The sampling component has one end connected to the detection end and the other end grounded.

[0025] The sampling connector has one end connected to the detection end and the other end connected to the detection circuit.

[0026] Beneficial effects: In this embodiment, when the magnetron is working, it generates a flowing anode current in the anode circuit. When the sampling component is connected to the detection terminal of the power converter, the anode current passes through the sampling component, thereby generating a sampling voltage signal. The sampling voltage signal passes sequentially through the sampling connector and the detection circuit, and finally reaches the first feedback terminal of the first controller. Thus, the first controller can quickly understand the working status of the magnetron based on the sampling voltage signal received from the first feedback terminal, so as to respond to and handle abnormal situations in a timely manner.

[0027] In one alternative implementation, the sampling component consists of a single sampling resistor, or multiple sampling resistors connected in series and / or in parallel.

[0028] In one alternative implementation, the sampling connector consists of a sampling wire and a current-limiting resistor, with the other end of the sampling wire connected to the detection circuit and the other end of the current-limiting resistor connected to the detection terminal.

[0029] In one optional implementation, the control circuit further includes:

[0030] The driver module has one end connected to the first output terminal and the other end connected to the signal receiving terminal of the second controller. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of the control circuit of the microwave oven in this embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Computer board; 11. First controller; 12. Detection circuit;

[0035] 2. Frequency converter; 21. Second controller; 22. Sampling circuit; 221. Sampling component; 222. Sampling connector; 23. Power converter; 24. Drive module; 241. Optocoupler; 242. Low-pass filter;

[0036] 3. Magnetron; 4. Communication interface;

[0037] D1, rectifier diode; D2, clamping diode; C1, filter capacitor; RF, discharge resistor; VCC, clamping voltage; RC, sampling resistor; RX, current limiting resistor. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] Currently, in traditional microwave ovens, communication between the inverter 2 and the control board 1 is achieved through two optocouplers 241 for transmitting and receiving signals. One optocoupler 241 is responsible for transmitting signal conversion, and the other is responsible for receiving signal conversion. Because the control board 1 does not directly acquire the operating status information of the magnetron 3 in the inverter 2, but rather completes the acquisition and identification through the control chip in the inverter 2, and then transmits it to the main control chip of the control board 1 via the optocouplers 241, the control board 1 cannot promptly grasp the operating status of the magnetron 3, resulting in poor overall real-time dynamic response of the equipment.

[0043] In view of this, the present invention provides a control circuit for a microwave oven to solve the problem of poor overall real-time dynamic response of the device.

[0044] The following is combined Figure 1 The following describes embodiments of the present invention.

[0045] According to an embodiment of the present invention, a control circuit for a microwave oven is provided, the control circuit including a magnetron 3, a first controller 11, a second controller 21, and a sampling and detection component.

[0046] Specifically, in this embodiment, the magnetron 3 is used to generate microwave heating for food. A first controller 11 is disposed in the computer board 1. The first controller 11 has a first output terminal and a first feedback terminal. After receiving an operation command from the user, the first controller 11 sends a corresponding signal from its first output terminal; this signal can be a PWM signal. The first feedback terminal is used to receive feedback signals from the sampling and detection component, allowing the understanding of the actual operating status of the magnetron 3.

[0047] Of course, operation commands can be input via buttons or via the operation panel. This embodiment is merely an example of the input type of operation commands, but it does not limit this. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0048] Furthermore, in this embodiment, the second controller 21 is provided with a signal receiving end and a control end. The signal receiving end of the second controller 21 is connected to the first output end, and the control end of the second controller 21 is connected to the magnetron 3. In actual operation, after receiving a signal from the first controller 11, the second controller 21 drives the magnetron 3 to execute the corresponding working state according to the instructions transmitted in the signal.

[0049] Furthermore, in this embodiment, one end of the sampling and detection component is connected to the magnetron 3, and the other end of the sampling and detection component is connected to the first feedback end. The sampling and detection component is used to collect the operating parameters of the magnetron 3.

[0050] With this configuration, this embodiment includes a sampling and detection component, which can directly collect the operating parameters of the magnetron 3. The sampling and detection component then transmits the collected parameters to the first controller 11 in the form of a signal. Compared to the multiple signal conversions of the optocoupler 241, this allows the first controller 11 to promptly control the operating status of the magnetron 3, thereby improving the overall real-time dynamic response of the device.

[0051] Furthermore, in an optional embodiment, the sampling and detection component includes a detection circuit 12 and a sampling circuit 22 connected in series. The other end of the detection circuit 12 is connected to the first feedback terminal, and the other end of the sampling circuit 22 is connected to the magnetron 3. The sampling circuit 22 is used to collect the operating parameters of the magnetron 3.

[0052] The detection circuit 12 and the sampling circuit 22 are described in detail below.

[0053] Furthermore, in an optional embodiment, the detection circuit 12 includes a rectifier diode D1 and a filter capacitor C1.

[0054] Specifically, in this embodiment, the cathode of rectifier diode D1 is connected to the first feedback terminal, and the anode of rectifier diode D1 is connected to the sampling circuit 22. One end of filter capacitor C1 is connected to the first feedback terminal, and the other end of filter capacitor C1 is grounded.

[0055] When the signal collected by the sampling circuit 22 is transmitted to the detection circuit 12, the signal is first rectified by the rectifier diode D1, then filtered by the filter capacitor C1, and finally the filtered signal is transmitted to the first feedback terminal of the first controller 11.

[0056] The signal acquired by the sampling circuit 22 can be a current signal, a voltage signal, or a temperature signal from the magnetron 3. Of course, this embodiment is merely an example of signal types and is not intended to limit the scope. Those skilled in the art can modify the signal according to actual circumstances to achieve the same technical effect.

[0057] Furthermore, in an optional embodiment, the detection circuit 12 further includes a discharge resistor RF, one end of which is connected to the first feedback terminal, and the other end of which is grounded.

[0058] In this embodiment, when the magnetron 3 is operating normally, the discharge resistor RF can act as a voltage divider to protect the first controller 11 from voltage fluctuations. When the magnetron 3 stops working, since there is still a certain voltage across the filter capacitor C1, the discharge resistor RF and the filter capacitor C1 form a discharge circuit, thereby eliminating the voltage across the filter capacitor C1.

[0059] Furthermore, in an optional embodiment, the detection circuit 12 further includes a clamping voltage VCC and a clamping diode D2. In this embodiment, the cathode of the clamping diode D2 is connected to the clamping voltage VCC, and the anode of the clamping diode D2 is connected to the first feedback terminal. Of course, this embodiment does not limit the specific value of the clamping voltage VCC; those skilled in the art can modify it according to actual conditions, as long as the same technical effect is achieved.

[0060] With this configuration, this embodiment sets up a clamping voltage VCC and a clamping diode D2 to clamp and protect the first controller 11, preventing damage to the first controller 11 caused by a high voltage of the feedback voltage signal from the sampling and detection component. When the voltage value is high, the clamping diode D2 conducts, thereby limiting the voltage applied to the first feedback terminal to the forward conduction voltage drop of the clamping diode D2, which will not exceed the safe value, thus protecting the first controller 11.

[0061] Furthermore, in an optional embodiment, the control circuit further includes a power converter 23, which is provided with an information feedback terminal, a signal input terminal, and a voltage output terminal.

[0062] Specifically, the information feedback terminal is connected to the second feedback terminal of the second controller 21, the signal input terminal is connected to the control terminal of the second controller 21, and the voltage output terminal of the power converter 23 is connected to the magnetron 3. That is, the second controller 21 will send corresponding signals to the power converter 23 based on the detected instructions. The power converter 23 will then adjust its output voltage to supply a certain voltage to the magnetron 3, causing the magnetron 3 to execute the corresponding operating state and generate microwave heating for the food. Simultaneously, the power converter 23 will also transmit relevant voltage and current information back to the second feedback terminal of the second controller 21 through the information feedback terminal, allowing the second controller 21 to adjust the operating mode of the power converter 23 in a timely manner.

[0063] Furthermore, in an optional embodiment, the power converter 23 is also provided with a detection terminal, which is connected to the other end of the sampling circuit 22. The detection terminal is used to form an anode current loop. The sampling circuit 22 includes a sampling component 221 and a sampling connector 222.

[0064] Specifically, one end of the sampling component 221 is connected to the detection end, and the other end of the sampling component 221 is grounded. One end of the sampling connector 222 is connected to the detection end, and the other end of the sampling connector 222 is connected to the detection circuit 12.

[0065] If the magnetron 3 is working normally, the anode current will remain within a specific range. Abnormal fluctuations in the anode current, such as being too high or too low, indicate a potential problem with the magnetron 3's operation. In this embodiment, when the anode current flows through the sampling component 221, the sampling component 221 generates a corresponding voltage signal. After rectification and filtering, the sampling connector 222 transmits the voltage signal to the first controller 11. The first controller 11 can then quickly understand the operating status of the magnetron 3 to respond and handle abnormal situations promptly.

[0066] Furthermore, the anode current is closely related to the heating performance of the microwave oven. Generally speaking, the higher the anode current, the higher the microwave power generated by the magnetron 3, and the faster the microwave oven heats up. Conversely, the lower the anode current, the lower the microwave power, and the slower the heating speed. Therefore, effective monitoring and control of the anode current helps ensure the stable and efficient operation of the microwave oven.

[0067] With this configuration, in this embodiment, when the magnetron 3 is working, it generates a flowing anode current in the anode circuit. When the sampling component 221 is connected to the detection terminal of the power converter 23, the anode current passes through the sampling component 221, thereby generating a sampling voltage signal. The sampling voltage signal passes sequentially through the sampling connector 222 and the detection circuit 12, and finally reaches the first feedback terminal of the first controller 11. Thus, the first controller 11 can quickly understand the working status of the magnetron 3 based on the sampling voltage signal received at the first feedback terminal, so as to respond to and handle abnormal situations in a timely manner.

[0068] Further, in an optional implementation, the sampling component 221 is composed of a single sampling resistor RC, or multiple sampling resistors RC connected in series and / or parallel. In this embodiment, as... Figure 1 As shown, it can be composed of two resistors connected in parallel, namely a first resistor and a second resistor.

[0069] Furthermore, in an optional embodiment, the sampling connector 222 consists of a sampling wire and a current-limiting resistor RX, with the other end of the sampling wire connected to the detection circuit 12 and the other end of the current-limiting resistor RX connected to the detection terminal.

[0070] Furthermore, in an optional embodiment, the control circuit further includes a drive module 24, one end of which is connected to the first output terminal, and the other end of which is connected to the signal receiving terminal of the second controller 21.

[0071] Specifically, in this embodiment, the driving module 24 may consist of an optocoupler 241 and a low-pass filter 242. The input side of the optocoupler 241 is connected to the first controller 11, the output side of the optocoupler 241 is connected to one end of the low-pass filter 242, and the other end of the low-pass filter 242 is connected to the signal receiving end of the second controller 21.

[0072] Furthermore, such as Figure 1 As shown, the low-pass filter 242 can be composed of a third resistor and a first capacitor connected in series.

[0073] Furthermore, in this embodiment, the computer board 1 can be composed of the first controller 11 and the detection circuit 12, and the frequency converter 2 can be composed of the second controller 21, the drive module 24, the power converter 23, and the sampling circuit 22. Of course, the frequency converter 2 and the computer board 1 can be connected through the communication interface 4.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A control circuit for a microwave oven, characterized in that, include: Magnetron (3) is used to generate microwaves to heat food; The first controller (11) is provided with a first output terminal and a first feedback terminal; The second controller (21) is provided with a signal receiving end and a control end; the signal receiving end of the second controller (21) is connected to the first output end, and the control end of the second controller (21) is connected to the magnetron (3); A sampling and detection component, one end of which is connected to the magnetron (3) and the other end of which is connected to the first feedback terminal; the sampling and detection component is used to collect the operating parameters of the magnetron (3).

2. The control circuit of the microwave oven according to claim 1, characterized in that, The sampling and detection component includes: A detection circuit (12) and a sampling circuit (22) are connected in series. The other end of the detection circuit (12) is connected to the first feedback terminal, and the other end of the sampling circuit (22) is connected to the magnetron (3). The sampling circuit (22) is used to collect the operating parameters of the magnetron (3).

3. The control circuit of the microwave oven according to claim 2, characterized in that, The detection circuit (12) includes: A rectifier diode (D1) is provided, wherein the cathode of the rectifier diode (D1) is connected to the first feedback terminal, and the anode of the rectifier diode (D1) is connected to the sampling circuit (22). A filter capacitor (C1) is provided, with one end connected to the first feedback terminal and the other end grounded.

4. The control circuit of the microwave oven according to claim 3, characterized in that, The detection circuit (12) further includes: A discharge resistor (RF) is provided, with one end connected to the first feedback terminal and the other end grounded.

5. The control circuit of the microwave oven according to claim 4, characterized in that, The detection circuit (12) further includes: Clamping voltage (VCC); A clamping diode (D2) is provided, wherein the cathode of the clamping diode (D2) is connected to the clamping voltage (VCC), and the anode of the clamping diode (D2) is connected to the first feedback terminal.

6. The control circuit of the microwave oven according to any one of claims 2 to 5, characterized in that, The control circuit also includes: The power converter (23) is provided with an information feedback terminal, a signal input terminal and a voltage output terminal; the information feedback terminal is connected to the second feedback terminal of the second controller (21), the signal input terminal is connected to the control terminal of the second controller (21), and the voltage output terminal of the power converter (23) is connected to the magnetron (3).

7. The control circuit of the microwave oven according to claim 6, characterized in that, The power converter (23) is further provided with a detection terminal, which is connected to the other end of the sampling circuit (22); the sampling circuit (22) includes: A sampling component (221), one end of which is connected to the detection end, and the other end of which is grounded; A sampling connector (222) is provided, one end of which is connected to the detection end, and the other end of which is connected to the detection circuit (12).

8. The control circuit of the microwave oven according to claim 7, characterized in that, The sampling component (221) consists of a single sampling resistor (RC), or multiple sampling resistors (RC) connected in series and / or in parallel.

9. The control circuit of the microwave oven according to claim 8, characterized in that, The sampling connector (222) consists of a sampling wire and a current-limiting resistor (RX). The other end of the sampling wire is connected to the detection circuit (12), and the other end of the current-limiting resistor (RX) is connected to the detection terminal.

10. The control circuit of the microwave oven according to any one of claims 7 to 9, characterized in that, The control circuit also includes: The driving module (24) has one end connected to the first output terminal and the other end connected to the signal receiving terminal of the second controller (21).

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