A microwave oven regulating protection circuit and a microwave oven

Abstract

The application discloses a microwave oven regulation and protection circuit and a microwave oven, and relates to the technical field of microwave ovens, in particular to a microwave oven regulation and protection circuit and a microwave oven. The microwave oven regulation and protection circuit comprises a magnetron, a current transformer, a current transformer and a magnetron are connected, and the current transformer collects an operating current signal of the magnetron; an operational amplifier circuit, the operational amplifier circuit and the current transformer are connected, the operational amplifier circuit comprises an adjustable resistor, the operational amplifier circuit receives the operating current signal, and outputs an operational amplifier current and a resistance value of the adjustable resistor; a control module, the control module and the operational amplifier circuit are connected, the control module receives the resistance value of the adjustable resistor and the operational amplifier current, and obtains operating power; a regulation and control circuit, the regulation and control circuit is connected with the control module and the adjustable resistor respectively, and the resistance value of the adjustable resistor is adjusted. Through the adjustable resistor and the operational amplifier current, the amplification multiple of the operational amplifier circuit is determined, accurate operating power is obtained, the microwave oven is accurately regulated and controlled by the control module, and corresponding protection is realized. Through the regulation and control circuit, the electric signal after operation and amplification is adjusted, so that the circuit has current adjustability.

Description

Technical Field

[0001] This invention relates to the field of microwave oven technology, and in particular to a microwave oven control and protection circuit and a microwave oven. Background Technology

[0002] In existing technologies, microwave ovens are all conventional microwave ovens. Most of the control in microwave ovens involves amplifying the collected electrical signals and then adjusting them based on the amplified signals. However, the control module still cannot accurately obtain the value of the original collected electrical signals, and it is difficult to adjust and detect the operating power of the microwave oven based on the amplified electrical signals, so as to provide corresponding protection. Summary of the Invention

[0003] The purpose of this invention is to provide a microwave oven control and protection circuit and a microwave oven to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this invention is to provide a microwave oven control and protection circuit and a microwave oven.

[0005] According to an embodiment of the first aspect of the present invention, a microwave oven control and protection circuit includes:

[0006] Magnetron;

[0007] A current transformer, which is connected to a magnetron, is used to collect the operating current signal of the magnetron.

[0008] An operational amplifier circuit is connected to a current transformer. The operational amplifier circuit includes an adjustable resistor. The operational amplifier circuit is used to receive the operating current signal and output the operational amplifier current and the resistance value of the adjustable resistor.

[0009] A control module is connected to an operational amplifier circuit. The control module receives the resistance value of the adjustable resistor and the operational amplifier current to obtain the operating power and outputs a first control signal.

[0010] The control circuit is connected to the control module and the adjustable resistor respectively. The control circuit receives the first control signal and adjusts the resistance value of the adjustable resistor.

[0011] Furthermore, the operational amplifier circuit also includes:

[0012] An operational amplifier, the input terminals of which are connected to a current transformer and an adjustable resistor, respectively;

[0013] A diode, wherein the anode of the diode is connected to the output terminal of the operational amplifier, and the cathode of the diode is connected to an adjustable resistor;

[0014] A filter circuit, wherein the input terminal of the filter circuit is connected to the cathode of the diode, and the output terminal of the filter circuit is connected to the control module.

[0015] Furthermore, the filtering circuit includes:

[0016] A first filter resistor is connected to the cathode of the diode;

[0017] An electrolytic capacitor, wherein the electrolytic capacitor is connected to a first filter resistor;

[0018] The second filter resistor is connected to the electrolytic capacitor.

[0019] A filter capacitor is connected to a second filter resistor and an electrolytic capacitor, respectively.

[0020] Furthermore, a microwave oven control and protection circuit also includes: a smoke sensor;

[0021] The smoke sensor is installed inside the microwave oven and is connected to the control module. The smoke sensor is used to detect the current smoke concentration and output the current smoke concentration to the control module so that the control module receives the current smoke concentration and outputs a second control signal.

[0022] Furthermore, a microwave oven control and protection circuit also includes: a power control circuit;

[0023] The power regulation circuit is connected to the control module and the external power supply respectively. The power regulation circuit is used to receive the second regulation signal and disconnect the external power supply to the microwave oven.

[0024] Furthermore, a microwave oven control and protection circuit also includes: a temperature detector;

[0025] The temperature detector is located inside the microwave oven and is connected to the control module. The temperature detector is used to detect the temperature of the item to be heated.

[0026] Furthermore, the power regulation circuit includes a regulation relay.

[0027] Furthermore, the operational amplifier is an OPA2348 operational amplifier.

[0028] Furthermore, the control module includes an SC95F8616B control chip.

[0029] According to an embodiment of a second aspect of the present invention, a microwave oven includes a microwave oven control and protection circuit as described in an embodiment of a first aspect of the present invention.

[0030] The beneficial effects of this invention are: by setting an adjustable resistor in the operational amplifier circuit, the control module determines the amplification factor of the operational amplifier circuit through the adjustable resistor and the operational amplifier current, obtains the specific operating current signal collected by the current transformer, and obtains the accurate operating power through the operating current signal, so that the control module can accurately regulate the microwave oven and thus play a corresponding protective role.

[0031] By adjusting the circuit, the amplified electrical signal is regulated so that the circuit has adjustable current. Attached Figure Description

[0032] Figure 1 This is a circuit diagram of a microwave oven control and protection circuit provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the framework of a microwave oven control and protection circuit provided by the present invention;

[0034] Figure 3 This is a schematic diagram of the framework of a microwave oven control and protection circuit provided in another embodiment of the present invention.

[0035] Reference numerals: 100, Control module; 200, Current transformer; 300, Operational amplifier circuit, Control module; VR1, Adjustable resistor; U1, Operational amplifier; D1, Diode; 310, Filter circuit; R4, First filter resistor; C1, Electrolytic capacitor; R5, Second filter resistor; C2, Filter capacitor; 400, Regulation circuit; 500, Power supply regulation circuit; 600, Temperature detector; 700, Smoke sensor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of the invention.

[0037] It should be noted that although functional modules are divided in the diagram, in some cases, the modules can be divided differently from those in the system.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0040] In existing technologies, microwave ovens are all conventional microwave ovens. Most of the control in microwave ovens involves amplifying the collected electrical signals and then adjusting them based on the amplified signals. However, the control module still cannot accurately obtain the value of the original collected electrical signals, and it is difficult to adjust and detect the operating power of the microwave oven based on the amplified electrical signals, so as to provide corresponding protection.

[0041] In existing technologies, microwave ovens are conventional microwave ovens. Most of the control in microwave ovens involves amplifying the collected electrical signals and then controlling them based on the amplified signals. However, the control module 100 still cannot accurately obtain the value of the original collected electrical signals, and it is difficult to adjust and detect the operating power of the microwave oven based on the amplified electrical signals, thus failing to provide corresponding protection.

[0042] According to an embodiment of the first aspect of the present invention, referring to Figures 1 to 2 In some embodiments of the present invention, a microwave oven control and protection circuit includes: a magnetron, a current transformer 200, an operational amplifier circuit 300, a control module 100, and a control circuit 400.

[0043] The magnetron's wires pass through the current transformer 200, which is electrically connected to the input terminal of the operational amplifier circuit 300. The output terminal of the operational amplifier circuit 300 is electrically connected to the input terminal of the control module 100, and the input terminal of the control circuit 400 is electrically connected to the output terminal of the control module 100. The operational amplifier circuit 300 includes an adjustable resistor VR1. The output terminal of the control circuit 400 is electrically connected to the adjustable resistor VR1.

[0044] The magnetron is used to convert direct current into microwave oscillation output to heat the items to be heated in the microwave oven. The current transformer 200 detects and collects the current in the magnetron to obtain the operating current signal, which is then output to the operational amplifier circuit 300.

[0045] The operational amplifier circuit 300 receives the operating current signal, processes the operating current signal, and outputs the operational amplifier current to the control module 100. The operational amplifier circuit 300 also sends the resistance value of the adjustable resistor VR1 to the control module 100.

[0046] The control module 100 receives the resistance value of the adjustable resistor VR1 and the operational amplifier current, determines the amplification factor of the operational amplifier circuit 300, obtains the specific operating current signal collected by the current transformer 200, and thus obtains the operating power. The control module 100 also outputs a first control signal to the control circuit 400.

[0047] The control module 100 includes an SC95F8616B control chip. In this embodiment, no specific limitation is made on the type of control chip; the control module 100 may also use other types of control chips.

[0048] The control circuit 400 receives the first control signal and adjusts the adjustable resistor VR1 to change its resistance value, thereby controlling the detected current and enabling the circuit to have adjustable current. The control circuit 400 can also control other functions of the microwave oven based on the first control signal.

[0049] In some embodiments, the control module 100 can output a first control signal based on the obtained operating power and the set power. For example, when the operating power is greater than the set power, the control module 100 controls the control circuit 400 to operate, thereby controlling the operation of the microwave oven and the resistance value of the adjustable resistor VR1, providing safety protection and power overload protection, while also having adjustable current.

[0050] By setting an adjustable resistor VR1 in the operational amplifier circuit 300, the control module 100 determines the amplification factor of the operational amplifier circuit 300 through the adjustable resistor VR1 and the operational amplifier current, and obtains the specific operating current signal collected by the current transformer 200. Through the operating current signal, the precise operating power is obtained, so that the control module 100 can accurately regulate the microwave oven, thereby playing a corresponding protective role.

[0051] The operationally amplified electrical signal is adjusted by the control circuit 400 to make the circuit have adjustable current.

[0052] According to an embodiment of the first aspect of the present invention, referring to Figures 1 to 2 In some embodiments of the present invention, the operational amplifier circuit 300 includes: an operational amplifier U1, a diode D1, and a filter circuit 310.

[0053] The input terminal of operational amplifier U1 is electrically connected to current transformer 200, that is, pins 6 and 5 of operational amplifier U1 are electrically connected to current transformer 200. The input terminal of operational amplifier U1 is also electrically connected to adjustable resistor VR1, that is, pin 6 of operational amplifier U1 is electrically connected to adjustable resistor VR1.

[0054] The anode of diode D1 is electrically connected to the output terminal of operational amplifier U1, that is, pin 6 of operational amplifier U1 is electrically connected to adjustable resistor VR1. The cathode of diode D1 is electrically connected to adjustable resistor VR1. Through diode D1 and adjustable resistor VR1, the amplified operational amplifier current can be obtained.

[0055] In this embodiment, the operational amplifier U1 is an OPA2348 operational amplifier U1. No specific restrictions are placed on the type of operational amplifier U1 in this embodiment; the operational amplifier circuit 300 may also use other types of operational amplifier U1.

[0056] The input terminal of the filter circuit 310 is electrically connected to the cathode of the diode D1, and the output terminal of the filter circuit 310 is electrically connected to the input terminal of the control module 100.

[0057] The filter circuit 310 includes: a first filter resistor R4, an electrolytic capacitor C1, a second filter resistor R5, and a filter capacitor C2.

[0058] One end of the first filter resistor R4 is electrically connected to the cathode of diode D1, and the other end of the first filter resistor R4 is electrically connected to the positive terminal of electrolytic capacitor C1. The positive terminal of electrolytic capacitor C1 is electrically connected to one end of the second filter resistor R5, and the negative terminal of electrolytic capacitor C1 is grounded. The other end of the second filter resistor R5 is connected to one end of filter capacitor C2, and the other end of the second filter resistor R5 is also connected to the input terminal of control module 100. One end of filter capacitor C2 is connected to the input terminal of control module 100, and the other end of filter capacitor is grounded.

[0059] The operational amplifier current is filtered by the filter circuit 310, and the amplification factor of the operational amplifier U1 is adjusted by adjusting the resistance value of the adjustable resistor VR1, thereby regulating the amplified electrical signal and making the circuit current adjustable.

[0060] According to an embodiment of the first aspect of the present invention, referring to Figure 1 and Figure 3 In some embodiments of the present invention, the control and protection circuit further includes a smoke sensor 700 and a power control circuit 500.

[0061] The smoke sensor 700 is installed inside the microwave oven housing, and the output terminal of the smoke sensor 700 is electrically connected to the input terminal of the control module 100.

[0062] The smoke sensor 700 detects the current smoke concentration inside the housing and sends the current smoke concentration to the control module 100. The control module 100 receives the current smoke concentration and outputs a second control signal.

[0063] In some embodiments, the control module 100 compares the current smoke concentration with the set smoke concentration. When the current smoke concentration is greater than the set smoke concentration, the control module 100 outputs a second control signal to the power control circuit 500.

[0064] The smoke sensor 700 can be an ionization smoke sensor, or it can be other types of sensors, such as an infrared beam smoke sensor or a light-shielding photoelectric smoke sensor. In this embodiment, no specific restrictions are placed on the type of smoke sensor 700.

[0065] In existing technologies, most smoke sensors 700 are placed on the outer casing or door of the microwave oven. However, when a safety hazard occurs, the internal circuitry of the microwave oven may also burn out, generating smoke. Furthermore, there are instances where the circuitry burns out first, producing smoke, which then enters the oven cavity. Therefore, in this embodiment, the smoke sensor 700 is specifically installed inside the microwave oven casing to detect the condition of the internal circuitry, quickly determining the microwave oven's operating status so that the control module 100 can make rapid adjustment decisions.

[0066] The output terminal of the power regulation circuit 500 is electrically connected to the input terminal of the control module 100, and the input terminal of the power regulation circuit 500 is electrically connected to an external power supply. The external power supply powers the microwave oven through the power regulation circuit 500. The power regulation circuit 500 includes: a regulation relay and a switch for the regulation relay.

[0067] The power regulation circuit 500 receives the second regulation signal sent by the control module 100 and disconnects the power supply from the external power source to achieve safety protection for the microwave oven.

[0068] In some embodiments, the control module 100 can output a first control signal based on the obtained operating power and the set power. For example, when the operating power is greater than the set power, the control module 100 outputs the first control signal to the power control circuit 500. The power control circuit 500 receives the first control signal sent by the control module 100 and disconnects the power supply from the external power source to achieve safety protection for the microwave oven.

[0069] According to an embodiment of the first aspect of the present invention, referring to Figure 1 and Figure 3 In some embodiments of the present invention, the control and protection circuit further includes a temperature detector 600.

[0070] Temperature detector 600 is installed inside the microwave oven, located on opposite sides of the inner wall of the oven cavity. The output terminal of temperature detector 600 is electrically connected to the input terminal of control module 100. Temperature detector 600 is used to detect the temperature of the items to be heated in the oven cavity of the microwave oven.

[0071] In some embodiments, the temperature detector 600 sends the temperature to the control module 100. Based on the temperature, the control module 100 determines the required operating power and adjusts the magnetron to control the microwave oven to heat the desired items at the required power. This improves the precision and accuracy of heating, preventing overheating or underheating of the items and ensuring a better user experience.

[0072] The temperature detector 600 can be an infrared sensor, or it can be other types of sensors, such as a thermistor, thermocouple, or silicon diode D1 temperature sensor. In this embodiment, no specific restrictions are placed on the type of temperature detector 600.

[0073] In a second aspect of the invention, a microwave oven includes a microwave oven control and protection circuit as described in the first aspect of the invention.

[0074] In some embodiments of the second aspect of the present invention, the microwave oven may also be provided with a heat dissipation device, which may consist of a plurality of heat sinks. The heat dissipation device is used to dissipate heat from the temperature detector to prevent the temperature in the oven cavity from being too high, damaging the temperature detector, and reducing the detection accuracy.

[0075] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A microwave oven control and protection circuit, characterized in that, include: Magnetron; A current transformer, which is connected to a magnetron, is used to collect the operating current signal of the magnetron. An operational amplifier circuit is connected to a current transformer. The operational amplifier circuit includes an adjustable resistor. The operational amplifier circuit is used to receive the operating current signal and output the operational amplifier current and the resistance value of the adjustable resistor. A control module is connected to an operational amplifier circuit. The control module receives the resistance value of the adjustable resistor and the operational amplifier current to obtain the operating power and outputs a first control signal. The control circuit is connected to the control module and the adjustable resistor respectively. The control circuit receives the first control signal and adjusts the resistance value of the adjustable resistor.

2. The microwave oven control and protection circuit according to claim 1, characterized in that, The operational amplifier circuit also includes: An operational amplifier, the input terminals of which are connected to a current transformer and an adjustable resistor, respectively; A diode, wherein the anode of the diode is connected to the output terminal of the operational amplifier, and the cathode of the diode is connected to an adjustable resistor; A filter circuit, wherein the input terminal of the filter circuit is connected to the cathode of the diode, and the output terminal of the filter circuit is connected to the control module.

3. The microwave oven control and protection circuit according to claim 2, characterized in that, The filtering circuit includes: A first filter resistor is connected to the cathode of the diode; An electrolytic capacitor, wherein the electrolytic capacitor is connected to a first filter resistor; The second filter resistor is connected to the electrolytic capacitor. A filter capacitor is connected to a second filter resistor and an electrolytic capacitor, respectively.

4. The microwave oven control and protection circuit according to claim 1, characterized in that, Also includes: smoke sensor; The smoke sensor is installed inside the microwave oven and is connected to the control module. The smoke sensor is used to detect the current smoke concentration and output the current smoke concentration to the control module so that the control module receives the current smoke concentration and outputs a second control signal.

5. A microwave oven control and protection circuit according to claim 4, characterized in that, Also includes: Power supply regulation circuit; The power regulation circuit is connected to the control module and the external power supply respectively. The power regulation circuit is used to receive the second regulation signal and disconnect the external power supply to the microwave oven.

6. A microwave oven control and protection circuit according to claim 1, characterized in that, Also includes: Temperature detector; The temperature detector is located inside the microwave oven and is connected to the control module. The temperature detector is used to detect the temperature of the item to be heated.

7. A microwave oven control and protection circuit according to claim 5, characterized in that, The power regulation circuit includes a regulation relay.

8. A microwave oven control and protection circuit according to claim 2, characterized in that, The operational amplifier is an OPA2348 operational amplifier.

9. A microwave oven control and protection circuit according to claim 1, characterized in that, The control module includes an SC95F8616B control chip.

10. A microwave oven, characterized in that, include: A microwave oven control and protection circuit as described in any one of claims 1 to 9.

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