Heating device for electromagnetic cooking equipment and electromagnetic cooking equipment

Abstract

The invention provides a heating device for electromagnetic cooking equipment and the electromagnetic cooking equipment, the heating device comprises a power supply part, a heating part and a control part, the power supply part is used for supplying electric energy to the heating part, the heating part comprises a plurality of resonance circuits, at least one resonance circuit has a first resonance frequency f1, and the control part is used for controlling the first resonance frequency f1. At least one resonant circuit has a second resonant frequency f2, f1 / f2 is greater than or equal to 1.2, and the control part is used for controlling the frequency of the current supplied to the heating part by the power supply part so as to adjust the output power of the plurality of electromagnetic coils, so that the resonant frequencies corresponding to the plurality of resonant circuits in the heating part of the heating device are differentially set so as to adjust the output power of the plurality of electromagnetic coils. According to the electromagnetic heating cooker, the output power of each resonance circuit can be adjusted by adjusting the frequency of the current supplied to the heating part, so that the expected heating effect can be applied to the electromagnetic heating cooker, and uniform heating can be conveniently realized.

Description

Heating devices and electromagnetic cooking equipment for electromagnetic cooking equipment Technical Field

[0001] This disclosure relates to the field of electromagnetic cooking equipment, and more particularly to a heating device for electromagnetic cooking equipment and electromagnetic cooking equipment. Background Technology

[0002] In existing technologies, the heating system of an induction cooker generates an alternating magnetic field in the coil on the cooktop using a high-frequency alternating current. This induces eddy currents at the bottom of the metal cookware, converting electrical energy into heat energy for efficient heating. While existing technologies employ multi-coil resonant circuits for heating, they fail to address the issue of coordinated power distribution among the coils. This can easily lead to significant temperature differences between different areas of the cookware's bottom, affecting cooking results. Therefore, improving the uniformity of cookware heating is a crucial technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this disclosure provides a heating device for electromagnetic cooking equipment and an electromagnetic cooking equipment.

[0004] This disclosure provides a heating device for an electromagnetic cooking appliance, comprising a power supply unit, a heating unit, and a control unit. The power supply unit supplies electrical energy to the heating unit. The heating unit includes multiple resonant circuits, each including an electromagnetic coil that generates a magnetic field. At least one of the resonant circuits has a first resonant frequency f1, and at least one of the resonant circuits has a second resonant frequency f2, where f1 / f2 ≥ 1.2. The control unit controls the frequency of the current supplied by the power supply unit to the heating unit to adjust the output power of the multiple electromagnetic coils.

[0005] Optionally, for any two resonant circuits, the ratio of the resonant frequency of the resonant circuit with the larger resonant frequency to the resonant frequency of the resonant circuit with the smaller resonant frequency is greater than or equal to 1.25.

[0006] Optionally, at least two resonant circuits have the same resonant frequency.

[0007] Optionally, the control unit is used to adjust the frequency of the current supplied by the power supply unit to the heating unit based on the real-time detected temperature.

[0008] Optionally, the control unit is used to determine the preset heating area of ​​the electromagnetic cooking device and the target heating temperature corresponding to the preset heating area according to the cooking command, and to adjust the frequency of the current supplied by the power supply unit to the heating unit according to the target heating temperature and the real-time detected temperature.

[0009] Optionally, the heating device further includes a temperature detection component, which includes temperature sensors respectively disposed corresponding to the electromagnetic coils of the plurality of resonant circuits. The temperature sensors are used to detect the temperature at their location in real time to obtain the real-time detected temperature.

[0010] Optionally, the heating device further includes a magnetic field shielding assembly for reducing magnetic field coupling between the plurality of electromagnetic coils. The magnetic field shielding assembly includes a first magnetic field shielding member disposed below the heating part and a second magnetic field shielding member located between adjacent electromagnetic coils.

[0011] Optionally, the heating device further includes a temperature monitoring and protection unit, which is used to control the heating unit to cut off power when the temperature of the electromagnetic heating cooker exceeds a preset temperature threshold.

[0012] This disclosure also provides an electromagnetic cooking device, including a support plate and a heating device as described above, wherein the support plate is used to support the electromagnetic heating cooker and the heating device is used to heat the electromagnetic heating cooker.

[0013] Optionally, the orthographic projection areas of the plurality of electromagnetic coils on the heating area do not overlap.

[0014] This disclosure provides the following beneficial effects: A heating device for an electromagnetic cooking appliance includes a power supply unit, a heating unit, and a control unit. The power supply unit supplies electrical energy to the heating unit. The heating unit includes multiple resonant circuits, each including an electromagnetic coil that generates a magnetic field. At least one resonant circuit has a first resonant frequency f1, and at least one resonant circuit has a second resonant frequency f2, where f1 / f2 ≥ 1.2. The control unit controls the frequency of the current supplied by the power supply unit to the heating unit to adjust the output power of the multiple electromagnetic coils. Thus, by differentiating the resonant frequencies of the multiple resonant circuits in the heating unit, the output power of each resonant circuit can be adjusted by changing the frequency of the current supplied by the power supply unit to the heating unit, thereby applying the desired heating effect to the electromagnetic heating cooker and facilitating uniform and differentiated heating. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of this disclosure, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a schematic diagram of the basic structure of the heating device according to the present disclosure. Detailed Implementation

[0017] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0018] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein.

[0019] This disclosure provides a heating device for an electromagnetic cooking apparatus, the electromagnetic cooking apparatus being used to heat an electromagnetic heating cooker, the electromagnetic heating cooker being made of metal or alloy, the electromagnetic heating cooker being used to hold or contain food and being able to heat the food.

[0020] The heating device includes a power supply unit, a heating unit, and a control unit. The power supply unit supplies electrical energy to the heating unit, specifically supplying a high-frequency alternating current to the heating unit. Optionally, the power supply unit includes a power connection component, a frequency adjustment component, and a connection component. The power connection component is used to connect to a power source, the frequency adjustment component is used to adjust the frequency of the current supplied to the heating unit, and the connection component is used to electrically connect to the heating unit to supply current to the heating unit.

[0021] The heating element includes multiple resonant circuits, each including an electromagnetic coil and a capacitor. The electromagnetic coil generates a magnetic field that induces eddy currents in the electromagnetic heating cooker, raising the temperature of the cooker and thus heating the food.

[0022] The resonant circuit has a resonant frequency f, which is calculated according to the following formula:

[0023] Where L is the inductance of the electromagnetic coil in the resonant circuit, and C is the capacitance of the capacitor in the resonant circuit.

[0024] At least one of the resonant circuits in the heating section has a first resonant frequency f1 and a second resonant frequency f2, wherein the first resonant frequency f1 and the second resonant frequency f2 satisfy: f1 / f2 ≥ 1.2. Thus, the resonant frequencies of at least a portion of the resonant circuits in the heating section are differentiated relative to the resonant frequencies of other resonant circuits.

[0025] Preferably, f1 / f2 ≥ 1.25, and more particularly, f1 / f2 ≥ 1.5. For example, the value of f1 / f2 can be 1.3, 1.4, 1.6, 2, 4, 6, 8 or 10.

[0026] The output power P of the electromagnetic coil in the resonant circuit is calculated using the following formula:

[0027] Where U is the voltage supplied to the resonant circuit, and R is the equivalent resistance of the resonant circuit. Let f be the frequency of the current supplied to the resonant circuit, f be the resonant frequency of the resonant circuit, and L be the inductance of the electromagnetic coil in the resonant circuit.

[0028] Optionally, the power supply unit supplies power to each resonant circuit in the heating unit. Preferably, the power supply unit supplies current with the same voltage and frequency to each resonant circuit in the heating unit. For example, the connection component of the power supply unit includes multiple connection terminals, each corresponding to a resonant circuit. The connection terminal is connected to the corresponding resonant circuit, and the AC current supplied by each connection terminal has the same voltage and frequency. At any given time, the AC current supplied by each connection terminal has the same frequency.

[0029] The control unit controls the frequency of the current supplied by the power supply unit to the heating unit, thereby adjusting the output power of the plurality of electromagnetic coils and distributing the output power among the plurality of electromagnetic coils. For resonant circuits with different resonant frequencies, the output power corresponding to their electromagnetic coils differs when supplied with current of the same frequency. Therefore, by adjusting the frequency of the current supplied by the power supply unit to the heating unit, the output power of each resonant circuit can be adjusted to achieve the desired heating effect on the electromagnetic heating cooker; at the same time, since the output power corresponding to the electromagnetic coils of the same resonant circuit differs when supplied with current of different frequencies, the output power of the resonant circuit can be adjusted in real time by adjusting the frequency of the supplied current, thereby controlling the resonant circuit to apply the desired heating effect to the electromagnetic heating cooker.

[0030] Optionally, the resonant frequency of the resonant circuit is 5-150kHz, preferably 10-100kHz.

[0031] In one optional embodiment, the multiple resonant circuits in the heating element each have different resonant frequencies, and for any two resonant circuits, the ratio of the resonant frequency of the circuit with the larger resonant frequency to the resonant frequency of the circuit with the smaller resonant frequency is greater than or equal to 1.2, preferably greater than or equal to 1.25, for example 1.3, 1.4, 1.5, 1.6, 2, 4, 6, 8, or 10. Therefore, by adjusting the frequency of the current supplied by the power supply unit to the heating element, the output power of each resonant circuit can be controlled, achieving uniform or differentiated heating of different areas of the electromagnetic heating cooker.

[0032] In another alternative embodiment, at least two resonant circuits in the heating element have the same resonant frequency. Optionally, at least two resonant circuits have a first resonant frequency f1, or at least two resonant circuits have a first resonant frequency f2, thereby allowing synchronous control of the output power of at least two resonant circuits with the same resonant frequency, facilitating adjustment of the heating zone of the electromagnetic cooking device.

[0033] For example, an electromagnetic cooking device includes a central heating area and an outer heating area, with the outer heating area located radially outside the central heating area. For instance, the electromagnetic cooking device includes a support plate, with the central area of ​​the support plate designated as the central heating area, and at least a portion of the outer periphery of the central heating area designated as the outer heating area. The heating element includes a central resonant circuit for heating the bottom of the electromagnetic cooker located in the central heating area, and at least two outer resonant circuits for heating the bottom of the electromagnetic cooker located in the outer heating areas. By adjusting the frequency of the current supplied by the power supply unit to the heating element, the output power corresponding to the central heating area and the outer heating area can be adjusted, thereby achieving differentiated heating or uniform heating of the electromagnetic cooker in the central heating area and the outer heating area.

[0034] By setting multiple resonant circuits in the outer heating area, multiple electromagnetic coils can be used to uniformly heat the electromagnetic heating cooker in the outer heating area, thereby improving the heating uniformity of the outer heating area.

[0035] Optionally, the multiple resonant circuits in the peripheral heating area have the same resonant frequency, which facilitates consistent heat distribution within the peripheral heating area. In an alternative example, the peripheral heating area comprises multiple peripheral sub-regions, each with a resonant circuit corresponding to a different resonant frequency. This allows for control of the heating power of different peripheral sub-regions by adjusting the frequency of the current supplied by the power supply to the heating element.

[0036] In another example, the electromagnetic cooking device includes multiple heating zones. For instance, the total heating area on the support plate of the electromagnetic cooking device is divided into multiple heating zones. The heating element includes multiple resonant circuits corresponding to each of the multiple heating zones. Each resonant circuit corresponds to one heating zone and is used to heat the bottom of the electromagnetic cooker located in its corresponding heating zone. By adjusting the frequency of the current supplied by the power supply to the heating element, the output power of the resonant circuit can be adjusted, thereby achieving differentiated or uniform heating of the electromagnetic cooker among the multiple heating zones. For example, the multiple heating zones are arranged in one or more rows. By adjusting the frequency of the current supplied by the power supply to the heating element, the output power of the resonant circuit can be adjusted. The user can select at least one heating zone for cooking according to their cooking needs, thus achieving a flexible cooking mode.

[0037] In an optional embodiment, the control unit is used to adjust the frequency of the current supplied by the power supply unit to the heating unit based on the real-time detected temperature. The real-time detected temperature is obtained by detecting the temperature at or near the bottom of the electromagnetic heating cooker, and represents the real-time temperature at or near the bottom of the electromagnetic heating cooker. Therefore, by adjusting the frequency of the current supplied by the power supply unit through real-time temperature feedback, the output power of each resonant circuit is adjusted in real-time to apply the desired heating effect to the electromagnetic heating cooker, avoiding excessively high or low local temperatures within the electromagnetic heating cooker.

[0038] In a specific example, the frequency of the current supplied by the power supply unit can be adjusted in real time based on the real-time temperature feedback, so as to adjust the output power of each resonant circuit in real time and ensure that each resonant circuit applies the desired heating effect to the bottom of the electromagnetic heating cooker. For example, based on the real-time temperature detection, the frequency of the current supplied by the power supply unit can be controlled to continuously switch between the resonant frequencies corresponding to multiple resonant circuits, so that the output power of each of the multiple resonant circuits is generally controlled within the desired range.

[0039] In an optional implementation, the control unit is used to determine the preset heating area of ​​the electromagnetic cooking device and the target heating temperature corresponding to the preset heating area according to the cooking command, and to adjust the frequency of the current supplied by the power supply unit to the heating unit according to the target heating temperature and the real-time detected temperature.

[0040] Specifically, the cooking instruction includes a cooking temperature, and optionally, the cooking instruction also includes at least one of a cooking mode, a cooking stage, and a cooking time. For an electromagnetic cooking device that includes multiple heating zones, the cooking instruction includes the heating temperature corresponding to each heating zone, or the cooking instruction includes the heating temperature corresponding to the heating zone to be heated, for example, including identification information of the heating zone to be heated and the heating temperature corresponding to the identification information.

[0041] The control unit determines the preset heating area and the target heating temperature corresponding to the electromagnetic cooking device according to the cooking command. The preset heating area is the area where the bottom of the corresponding electromagnetic heating cooker needs to be heated during the cooking process, and the target heating temperature is the cooking temperature corresponding to the bottom of the electromagnetic heating cooker corresponding to that preset heating area. The control unit adjusts the frequency of the current supplied to the heating unit by the power supply unit based on the target heating temperature and the real-time detected temperature of each preset heating area, for example, based on the difference between the target heating temperature and the real-time detected temperature. This adjusts the output power of the resonant circuit corresponding to each preset heating area, thereby distributing the output power among multiple preset heating areas. This ensures that the bottom of the electromagnetic heating cooker corresponding to multiple preset heating areas reaches the target heating temperature, achieving precise cooking control and improving the cooking effect.

[0042] In an optional embodiment, the heating device further includes a temperature detection component. The temperature detection component includes temperature sensors corresponding to the electromagnetic coils of the plurality of resonant circuits. Optionally, at least one temperature sensor is provided for each electromagnetic coil of the resonant circuit; preferably, multiple temperature sensors are provided. The temperature sensors are used to detect the temperature at their location in real time to obtain the real-time detected temperature. In an optional example, the temperature sensors are located on or below the support plate of the electromagnetic cooking device; for example, the temperature sensors are embedded in the support plate of the electromagnetic cooking device, thereby achieving accurate detection of the temperature at the bottom of the electromagnetic heating cooker.

[0043] In an optional example, the temperature detection component includes a plurality of temperature sensors uniformly distributed corresponding to the total heating area on the support plate of the electromagnetic cooking device, for example, the plurality of temperature sensors forming a temperature sensor matrix. The plurality of temperature sensors are arranged such that each heating area corresponding to a resonant circuit is provided with at least one temperature sensor.

[0044] In an optional embodiment, the heating device further includes a magnetic field shielding assembly for reducing magnetic field coupling between the plurality of electromagnetic coils. The magnetic field shielding assembly includes a first magnetic field shield disposed below the heating element and a second magnetic field shield located between adjacent electromagnetic coils. The first magnetic field shield is made of a magnetically conductive material and is used to isolate the downwardly extending magnetic field below the electromagnetic coils. The second magnetic field shield is also made of a magnetically conductive material, and is preferably constructed as a metal plate, to reduce magnetic field interference between adjacent coils. Thus, the magnetic field shielding assembly suppresses mutual inductance interference between the electromagnetic coils, ensuring that each electromagnetic coil heats the electromagnetic heating cooker normally.

[0045] In an optional embodiment, the heating device further includes a temperature monitoring and protection unit, which controls the heating unit to cut off power when the temperature of the electromagnetic heating cooker exceeds a preset temperature threshold. Optionally, the temperature monitoring and protection unit includes a negative temperature coefficient thermistor, which is disposed on or below the support plate and monitors temperature changes in real time. If the temperature of the negative temperature coefficient thermistor exceeds the preset protection temperature threshold, a power-off protection is triggered, for example, cutting off the current supplied to the heating unit, to prevent the heating device, electromagnetic cooking equipment, or electromagnetic heating cooker from overheating and being damaged, thus ensuring the safety of the cooking process.

[0046] In an alternative implementation, the temperature monitoring and protection unit is used to generate a power-off command when the temperature of the electromagnetic heating cooker exceeds a preset temperature threshold, so that the power supply unit cuts off power based on the power-off command and stops supplying power to the heating unit.

[0047] In one specific embodiment, the electromagnetic cooking device includes the heating element, the heating section of which comprises two resonant circuits. For one resonant circuit, the inductance of the electromagnetic coil is 80 μH, the capacitance of the capacitor is 0.8 μF, and the resonant frequency is 19.89 kHz; for the other resonant circuit, the inductance of the electromagnetic coil is 45 μH, the capacitance of the capacitor is 0.54 μF, and the resonant frequency is 32.29 kHz. When the power supply provides a current frequency of 20 kHz to the heating element, the output power of the two resonant circuits is 3.63 kW and 0.40 kW, respectively; when the power supply provides a current frequency of 40 kHz, the output power of the two resonant circuits is 0.17 kW and 1.48 kW, respectively. In this example, the cookware achieves high heating uniformity, with a bottom surface temperature difference of ±3°C, which is 90% lower than that of a traditional single-coil induction cooker. The thermal efficiency is 92.5%, energy consumption is reduced, and the heating response time is shortened to 8 seconds, 50% shorter than that of a traditional system.

[0048] In another specific embodiment, the electromagnetic cooking device includes the heating element, whose heating section comprises four resonant circuits: a first resonant circuit, a second resonant circuit, a third resonant circuit, and a fourth resonant circuit. Specifically, the first resonant circuit has an electromagnetic coil with an inductance of 100 μH, a capacitor with a capacitance of 0.6 μF, and a resonant frequency of 18.38 kHz; the second resonant circuit has an electromagnetic coil with an inductance of 60 μH, a capacitor with a capacitance of 0.4 μF, and a resonant frequency of 25.83 kHz; the third resonant circuit has an electromagnetic coil with an inductance of 40 μH, a capacitor with a capacitance of 0.3 μF, and a resonant frequency of 32.58 kHz; and the fourth resonant circuit has an electromagnetic coil with an inductance of 25 μH, a capacitor with a capacitance of 0.2 μF, and a resonant frequency of 40.55 kHz. The output power of these four resonant circuits can be controlled by adjusting the frequency of the current supplied by the power supply to the heating section (ranging from 18 to 42 kHz). In this example, the cookware achieves high heating uniformity, with a temperature difference of ±4℃ on the bottom surface, which is 87% lower than that of a traditional single-coil induction cooker. The thermal efficiency is 93.2%, energy consumption is reduced, and the heating response time is shortened to 7 seconds, which is 55% shorter than that of a traditional system.

[0049] This disclosure also provides an electromagnetic cooking device, including a support plate and a heating device as described above. The support plate is used to support the electromagnetic heating cooker, and the heating device is used to heat the electromagnetic heating cooker.

[0050] In one alternative implementation, the orthographic projection areas of the plurality of electromagnetic coils on the heating region do not overlap.

[0051] Optionally, the electromagnetic cooking device includes an operation unit for receiving user input, generating cooking instructions based on the user's input, and controlling the heating state of the heating device. The operation unit may optionally include a touchscreen display, through which the user can set parameters such as temperature and time.

[0052] In an alternative example, the support plate can be replaced with a support frame to accommodate the needs of different electromagnetic cooking devices.

[0053] It should be noted that the above embodiments are illustrative of the invention and not limiting of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The use of the words first, second, third, etc., does not indicate any order and can be interpreted as names.

[0054] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A heating device for an electromagnetic cooking apparatus, comprising a power supply unit, a heating unit, and a control unit, wherein the power supply unit supplies electrical energy to the heating unit; characterized in that, The heating unit includes multiple resonant circuits, each including an electromagnetic coil for generating a magnetic field. At least one of the resonant circuits has a first resonant frequency f1, and at least one of the resonant circuits has a second resonant frequency f2, where f1 / f2 ≥ 1.

2. The control unit controls the frequency of the current supplied to the heating unit by the power supply unit to adjust the output power of the multiple electromagnetic coils.

2. The heating device according to claim 1, characterized in that, For any two resonant circuits, the ratio of the resonant frequency of the resonant circuit with the larger resonant frequency to the resonant frequency of the resonant circuit with the smaller resonant frequency is greater than or equal to 1.

25.

3. The heating device according to claim 1, characterized in that, At least two resonant circuits have the same resonant frequency.

4. The heating device according to any one of claims 1 to 3, characterized in that, The control unit is used to adjust the frequency of the current supplied by the power supply unit to the heating unit based on the real-time detected temperature.

5. The heating device according to claim 4, characterized in that, The control unit is used to determine the preset heating area of ​​the electromagnetic cooking device and the target heating temperature corresponding to the preset heating area according to the cooking command, and to adjust the frequency of the current supplied by the power supply unit to the heating unit according to the target heating temperature and the real-time detected temperature.

6. The heating device according to claim 4, characterized in that, It also includes a temperature detection component, which includes temperature sensors respectively arranged corresponding to the electromagnetic coils of the plurality of resonant circuits. The temperature sensors are used to detect the temperature at their location in real time to obtain the real-time detected temperature.

7. The heating device according to any one of claims 1 to 3, characterized in that, It also includes a magnetic field shielding assembly for reducing magnetic field coupling between the plurality of electromagnetic coils. The magnetic field shielding assembly includes a first magnetic field shielding member disposed below the heating part and a second magnetic field shielding member located between adjacent electromagnetic coils.

8. The heating device according to any one of claims 1 to 3, characterized in that, It also includes a temperature monitoring and protection unit, which is used to control the heating element to cut off power when the temperature of the electromagnetic heating cooker exceeds a preset temperature threshold.

9. An electromagnetic cooking device, characterized in that, It includes a support plate and a heating device as described in any one of claims 1-8, wherein the support plate is used to support an electromagnetic heating cooker and the heating device is used to heat the electromagnetic heating cooker.

10. The electromagnetic cooking device according to claim 9, characterized in that, The support plate includes a heating area, and the orthogonal projection areas of the plurality of electromagnetic coils on the heating area do not overlap.

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