Induction cooker control circuit with safety control

By introducing a temperature detection module and a fuse mechanism into the induction cooker, the problem of overload damage to the induction cooker is solved, achieving precise temperature control and automatic power-off protection, thus improving the safety and reliability of the induction cooker.

CN223579967UActive Publication Date: 2025-11-21GUANGDONG WILLING TECH CORP
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Patent Information

Application Number
CN202520213326.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-11
Publication Date
2025-11-21
Estimated Expiration
2035-02-11

AI Technical Summary

Technical Problem

Existing induction cookers may be damaged when the operating temperature exceeds the preset temperature, lacking an effective protection mechanism.

Method used

An induction cooker control circuit with fuse control was designed, including a temperature detection module, a main control board, a heating coil, first and second temperature fuses, a heat dissipation module and a display module. Automatic power-off protection is achieved through real-time temperature detection and fuse blowing mechanism.

Benefits of technology

It achieves precise temperature control and automatic power-off protection for the induction cooker, preventing damage caused by abnormal temperature and improving the safety and reliability of the induction cooker.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of induction cookers, and particularly discloses an induction cooker control circuit with safety control, which comprises a main control board connected with a power supply circuit, and a temperature detection module and a heating coil which are respectively and electrically connected with the main control board, a first temperature fuse is connected in series between the main control board and the power supply circuit, and a second temperature fuse is connected in series between the main control board and the power supply circuit. The first temperature fuse is in heat conduction connection with the heating coil or the temperature detection module. The temperature of the bottom face of the pan is detected in real time through the temperature detection module, the heating temperature of the heating coil can be controlled in real time through the main control panel, and therefore precise control over the cooking temperature is achieved; by means of the first temperature fuse, when the working temperature of the induction cooker is abnormal, connection with the power supply circuit can be automatically disconnected, automatic power-off of the induction cooker is achieved, and the induction cooker is protected.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic oven, more specifically, the utility model relates to a kind of electromagnetic oven control circuit with safety control. BACKGROUND

[0002] Electromagnetic oven is common household appliance in daily life, can be carried out electromagnetic induction heating to flat-bottomed pot, so that flat-bottomed pot can be used to cook, the main body of heat generation is heating coil, so as to realize the control of the heating temperature of flat-bottomed pot by controlling heating coil.

[0003] In prior art, when electromagnetic oven works, if its working temperature exceeds the temperature set in advance, electromagnetic oven can be damaged.

[0004] Therefore, it is necessary to provide a kind of electromagnetic oven control circuit with safety control to at least partially solve the problems existing in prior art. SUMMARY

[0005] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the utility model does not mean to try to limit the key features and necessary technical features of the claimed technical solution, and even less means to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the utility model provides a kind of electromagnetic oven control circuit with safety control, including: the main control board connected with power supply circuit, temperature detection module and heating coil electrically connected with main control board respectively, first temperature fuse is connected in series between main control board and power supply circuit, first temperature fuse is connected with heating coil or temperature detection module and is connected by heat conduction.

[0007] Preferably, it further includes: heat dissipation module A and heat dissipation module B electrically connected with main control board.

[0008] Preferably, it further includes: display module electrically connected with main control board.

[0009] Preferably, second temperature fuse is connected in series between main control board and power supply circuit, and second temperature fuse is connected with main control board by heat conduction.

[0010] Preferably, first temperature fuse and second temperature fuse are connected on live wire of power supply circuit.

[0011] Preferably, the temperature detection module includes: temperature detection unit, and the temperature detection unit is electrically connected with main control board.

[0012] Preferably, the temperature detection unit comprises a temperature sensor NTC, a diode D1, a capacitor C1 and a resistor R1, one end of the temperature sensor NTC is connected with a direct current positive voltage, the other end is connected with one end of the diode D1, the capacitor C1 and the resistor R1 are connected in parallel, one end of the capacitor C1 and one end of the resistor R1 are connected between the temperature sensor NTC and the diode D1, and the other end of the capacitor C1 and the other end of the resistor R1 are grounded.

[0013] Preferably, the temperature detection module further comprises an operational amplification unit, an input end of the operational amplification unit is electrically connected with the temperature detection unit, and an output end of the operational amplification unit is electrically connected with the main control board.

[0014] Preferably, the operational amplification unit comprises an operational amplifier U1 and a diode D2, a positive electrode of the diode D2 is connected with an output end of the operational amplifier U1, a negative electrode of the diode D2 is connected with an inverting input end of the operational amplifier U1, and an output end of the operational amplifier U1 is electrically connected with the main control board.

[0015] Preferably, the temperature detection module further comprises a temperature reminding unit electrically connected with the main control board, the temperature reminding unit comprises a buzzer BZ and a capacitor C5, one end of the capacitor C5 is electrically connected with the main control board, the other end is electrically connected with a negative electrode of the buzzer BZ, and a positive electrode of the buzzer BZ is connected with a direct current positive voltage.

[0016] Compared with the prior art, the utility model at least has following beneficial effects:

[0017] The temperature detection module detects the temperature of the bottom surface of the flat-bottomed pot in real time, the main control board can control the heating temperature of the heating coil in real time, so that the precise control of the cooking temperature is realized, and the first temperature fuse can automatically disconnect the connection with the power supply circuit when the working temperature of the induction cooker is abnormal, so that the induction cooker is automatically powered off, and the induction cooker is protected.

[0018] The utility model discloses a control circuit of induction cooker with insurance control, and other advantages, objects and features of the utility model will be partly embodied through the following description, and some will be understood by the person skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0020] Figure 1The schematic diagram of the induction cooker control circuit with insurance control is shown in the utility model.

[0021] Figure 2 The connection schematic diagram of the first temperature fuse and the second temperature fuse in the induction cooker control circuit with insurance control is shown in the utility model.

[0022] Figure 3 The circuit schematic diagram of the temperature detection unit and the operational amplifier unit in the induction cooker control circuit with insurance control is shown in the utility model.

[0023] Figure 4 The circuit schematic diagram of the temperature reminding unit in the induction cooker control circuit with insurance control is shown in the utility model. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail in combination with the drawings and embodiments, so that the person skilled in the art can implement according to the description.

[0025] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0026] As Figure 1 The utility model provides a kind of induction cooker control circuit with insurance control, it include: with the main control board of power supply circuit connection, temperature detection module and heating coil are electrically connected with main control board respectively, first temperature fuse 1 is connected in series between main control board and power supply circuit, first temperature fuse 1 is heat-conducting connection between heating coil or temperature detection module.

[0027] Among them, first temperature fuse 1 and heating coil or temperature detection module are insulated.

[0028] Among them, power supply circuit includes: fire line (such as Figure 1 The L line shown) and zero line (such as Figure 1 The N line shown).

[0029] Temperature detection module is used to detect the temperature of the bottom surface of the flat-bottomed pot, then the detected temperature is transmitted to the main control board, the heating temperature of the heating coil is controlled by the main control board, the cooking temperature of the flat-bottomed pot can be accurately controlled, and the temperature of the flat-bottomed pot can be prevented from being too high during cooking, to prevent the flat-bottomed pot from being burnt;

[0030] The first temperature fuse 1 in the electromagnetic oven is arranged close to the heating coil or the temperature detection module, can accurately detect the temperature of the heating coil or the bottom of the pan, and when the electromagnetic oven works abnormally, the temperature of the bottom of the heating coil or the pan exceeds the preset temperature (the melting temperature of the first temperature fuse 1), heat is transferred to the first temperature fuse 1, and the first temperature fuse 1 is automatically melted to disconnect the main control board and the power supply circuit.

[0031] Through the above design, the temperature detection module is used to detect the temperature of the bottom of the pan in real time, the heating temperature of the heating coil can be controlled by the main control board in real time, so that the cooking temperature is accurately controlled; the first temperature fuse 1 can automatically disconnect the connection with the power supply circuit when the working temperature of the electromagnetic oven is abnormal, so that the electromagnetic oven is automatically powered off, and the electromagnetic oven is protected.

[0032] As shown in Figure 1 In one embodiment, the main control board is electrically connected with a heat dissipation module A and a heat dissipation module B.

[0033] The heat dissipation module A includes a heat dissipation fan A, and the heat dissipation module B includes a heat dissipation fan B. The heat dissipation fan A and the heat dissipation fan B can be controlled by the main control board to dissipate heat from the main control board and the heating coil through the heat dissipation fan A and the heat dissipation fan B, so as to prevent the temperature in the electromagnetic oven from being too high; the specific control of the heat dissipation fan A and the heat dissipation fan B can adopt any one of the control circuits for the air cooling heat dissipation of the electromagnetic oven in the prior art, which will not be described here.

[0034] As shown in Figure 1 In one embodiment, the main control board is electrically connected with a display module.

[0035] The display module is a display module electrically connected with the main control board, which includes a display screen for displaying cooking data (such as temperature, time, etc.). The specific control of the display module by the main control board can adopt any one of the control circuits for the display of cooking data of the electromagnetic oven in the prior art, which will not be described here.

[0036] As shown in Figure 2 In one embodiment, the main control board and the power supply circuit are further connected in series with a second temperature fuse 2, and the second temperature fuse 2 is in thermal connection with the main control board.

[0037] In order to further improve the protection when the electromagnetic oven works abnormally, the second temperature fuse 2 is arranged close to the main control board and in thermal connection with the main control board. When the main control board works abnormally, the temperature abnormally rises, heat is transferred to the second temperature fuse 2, and when the temperature exceeds the preset temperature (the melting temperature of the second temperature fuse 2), the second temperature fuse 2 is automatically melted to disconnect the main control board and the power supply circuit, thereby protecting the electromagnetic oven.

[0038] As shown in Figure 2 Further, the first temperature fuse 1 and the second temperature fuse 2 are both connected to the live wire of the power supply line.

[0039] When the first temperature fuse 1 or the second temperature fuse 2 exceeds the pre-set temperature, it will be fused, cutting off the live wire of the power supply line, and achieving automatic power-off.

[0040] As shown in Figure 3 In an embodiment, the temperature detection module comprises a temperature detection unit, which is electrically connected to the main control board.

[0041] As shown in Figure 3 Further, the temperature detection unit comprises a temperature sensor NTC, a diode D1, a capacitor C1 and a resistor R1, one end of the temperature sensor NTC is connected to a direct current positive voltage, the other end is connected to one end of the diode D1, the capacitor C1 and the resistor R1 are connected in parallel, one end of the capacitor C1 and one end of the resistor R1 are connected between the temperature sensor NTC and the diode D1, and the other end of the capacitor C1 and the other end of the resistor R1 are both grounded.

[0042] Among them, the temperature detection unit can be set to one or more, when the temperature detection unit is set to one, the diode D1 is replaced by a resistor, which is electrically connected to the main control board through the resistor; when the temperature detection unit is set to multiple, multiple temperature detection units are connected in parallel, and the diode D1 is electrically connected to the main control board through the diode D1;

[0043] The capacitor C1 is used for voltage stabilization, and the resistor R1 is used for voltage division;

[0044] At room temperature, the resistance of the temperature sensor NTC is a fixed value, when the temperature of the bottom surface of the flat-bottomed pot rises, the resistance of the temperature sensor NTC will decrease with the rise of the temperature, and the voltage distributed by the resistor R1 will increase, thereby realizing real-time monitoring of the temperature;

[0045] When the temperature detection unit is set to multiple, for example, there are at least two temperature sensors NTC in contact with the bottom surface of the flat-bottomed pot, the output voltage at the diode D1 in the two temperature detection units adopts "or" gate logic, and the diode D1 will only be turned on when the voltage difference between the anode and the cathode of the diode D1 is positive. Therefore, when the diode D1 of one temperature detection unit is turned on and its voltage is higher than that of the diode D1 of another temperature detection unit, the cathode voltage of the diode D1 of the other temperature detection unit is higher than the anode voltage, so the diode D1 will not be turned on. Therefore, multiple temperature detection units can transmit the highest voltage detected to the main control board, and the main control board can control the heating coil, thereby improving the temperature control accuracy.

[0046] like Figure 3 As shown, in one embodiment, the temperature detection module further includes an operational amplifier unit, the input terminal of which is electrically connected to the temperature detection unit, and the output terminal of which is electrically connected to the main control board.

[0047] like Figure 3 As shown, the operational amplifier unit further includes an operational amplifier U1 and a diode D2. The positive terminal of the diode D2 is connected to the output terminal of the operational amplifier U1, the negative terminal of the diode D2 is connected to the inverting input terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 is electrically connected to the main control board.

[0048] Based on the aforementioned embodiment, an operational amplifier unit is added. The non-inverting input terminal of the operational amplifier U1 is connected to the negative terminal of the diode D1. Since the PN junction of the diode D1 is affected by temperature, the voltage drop at the diode D1 will change when the temperature rises. Therefore, by setting a diode D2 with the same model as the diode D1, the diodes D1 and D2 are subjected to the same temperature effect, which can cancel out the temperature effect of the diode D1 and eliminate the temperature effect on the diode D1, thereby ensuring the accuracy of temperature detection.

[0049] like Figure 4 As shown, in one embodiment, the temperature detection module further includes a temperature reminder unit electrically connected to the main control board. The temperature reminder unit includes a buzzer BZ and a capacitor C5. One end of the capacitor C5 is electrically connected to the main control board, and the other end is electrically connected to the negative terminal of the buzzer BZ. The positive terminal of the buzzer BZ is connected to a positive DC voltage.

[0050] Based on the aforementioned embodiment, a temperature reminder unit is added. One end of capacitor C5 can share the same interface on the main control board with the output of operational amplifier U1. When the temperature detected by the temperature detection unit exceeds the preset temperature, but the first temperature fuse 1 has not yet blown, a 4kHz square wave can be output by the main control board to make the buzzer BZ sound, so as to remind people to manually cut off the power in time.

[0051] When the temperature detection module is performing temperature detection, the interface connected to capacitor C5 on the main control board is in input mode. Under the isolation of capacitor C5, buzzer BZ will not emit sound.

[0052] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and can be applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. An induction cooker control circuit with safety control, characterized in that, The utility model relates to a temperature detection module and heating coil are connected with the main control board of power supply line, first temperature fuse is connected between the main control board and power supply line, and the first temperature fuse is in heat conduction connection with heating coil or temperature detection module. Further comprising:

2. The induction cooker control circuit with safety control according to claim 1, characterized in that, The heat dissipation module A and heat dissipation module B are electrically connected with the main control board. Further comprising:

3. The induction cooker control circuit with safety control according to claim 1, characterized in that, The display module is electrically connected with the main control board. Second temperature fuse is also connected between the main control board and power supply line, and the second temperature fuse is in heat conduction connection with the main control board.

4. The induction cooker control circuit with safety control according to claim 1, characterized in that, The first temperature fuse and second temperature fuse are connected on the live wire of power supply line.

5. The induction cooker control circuit with safety control according to claim 4, characterized in that, The temperature detection module comprises: a temperature detection unit, which is electrically connected with the main control board.

6. The induction cooker control circuit with safety control according to claim 1, characterized in that, The temperature detection unit comprises: a temperature sensor NTC, a diode D1, a capacitor C1 and a resistor R1, one end of the temperature sensor NTC is connected with a direct current positive voltage, the other end is connected with one end of the diode D1, the capacitor C1 and the resistor R1 are connected in parallel, one end of the capacitor C1 and one end of the resistor R1 are connected between the temperature sensor NTC and the diode D1, and the other end of the capacitor C1 and the other end of the resistor R1 are grounded.

7. The induction cooker control circuit with safety control according to claim 6, characterized in that, The temperature detection module further comprises: an operational amplifier unit, the input end of the operational amplifier unit is electrically connected with the temperature detection unit, and the output end of the operational amplifier unit is electrically connected with the main control board.

8. The induction cooker control circuit with safety control according to claim 7, characterized in that, The operational amplifier unit comprises: an operational amplifier U1 and a diode D2, the positive electrode of the diode D2 is connected with the output end of the operational amplifier U1, the negative electrode of the diode D2 is connected with the inverting input end of the operational amplifier U1, and the output end of the operational amplifier U1 is electrically connected with the main control board.

9. The induction cooker control circuit with safety control according to claim 8, characterized in that, The temperature detection module further comprises a temperature reminding unit electrically connected with the main control board, and the temperature reminding unit comprises: a buzzer BZ and a capacitor C5, one end of the capacitor C5 is electrically connected with the main control board, the other end is electrically connected with the negative electrode of the buzzer BZ, and the positive electrode of the buzzer BZ is connected with a direct current positive voltage.

10. The induction cooker control circuit with safety control according to claim 9, characterized in that, ​