CN112859958A - Induction cooker surface temperature control circuit and method - Google Patents
Induction cooker surface temperature control circuit and method Download PDFInfo
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- CN112859958A CN112859958A CN202110149741.6A CN202110149741A CN112859958A CN 112859958 A CN112859958 A CN 112859958A CN 202110149741 A CN202110149741 A CN 202110149741A CN 112859958 A CN112859958 A CN 112859958A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Abstract
A first pin of a triode Q1 in a zero-crossing detection circuit is connected with a zero-crossing signal receiving pin of a main control chip circuit, a second pin of a triode Q1 is connected with one end of a resistor R2, a third pin of a triode Q1 is connected with the other end of a resistor R2, one end of a resistor R1 is connected between the third pin of a triode Q1 and a resistor R2, and the zero-crossing detection circuit is connected between an EMC protection circuit and a rectification filter circuit through the other end of the resistor R1; the preset temperature of the electromagnetic oven surface of the user is obtained, the preset temperature and the current temperature of the electromagnetic oven surface are judged and compared, and the heating control is carried out on the temperature in the electromagnetic oven by adopting various power combinations, so that the more accurate and stable temperature is achieved. The invention can heat without stopping when the power of the induction cooker is lower, thereby controlling the temperature of food in the pot more accurately and more constantly by using different high and low power.
Description
Technical Field
The invention relates to the technical field of induction cookers, in particular to a circuit and a method for controlling the surface temperature of an induction cooker.
Background
The electromagnetic oven utilizes alternating current to generate an alternating magnetic field with constantly changed direction through a coil according to an electromagnetic induction phenomenon, and eddy current (the reason can refer to Faraday's law of electromagnetic induction) can appear in a conductor in the alternating magnetic field, which is caused by the fact that an eddy electric field pushes carriers (electrons but no iron atoms in a pot) in the conductor to move; the joule heating effect of the eddy current heats the conductor, thereby achieving heating.
At present, a single-tube (single-IGBT) parallel resonance scheme is adopted in part of electromagnetic oven electronic control schemes, and because IGBT switches are in a hard switching state at low power (usually lower than 1000W), loss is large, and IGBT temperature rise is high, the schemes generally adopt a discontinuous heating mode at low power and adopt 1000W intermittent heating to obtain lower power values, such as 500W, 300W and the like. The discontinuous heating mode is also called intermittent heating, and when the temperature of food or water in the pot is required to be controlled, the temperature change of the food in the pot is large, usually more than 10 ℃, even larger, and larger error, so that the requirement of more accurate temperature cannot be met. A new technical scheme for controlling the surface temperature of the induction cooker is needed.
Disclosure of Invention
Therefore, the invention provides a circuit and a method for controlling the temperature of the surface of the induction cooker, so that the induction cooker can be heated without stopping when the power of the induction cooker is lower, and the temperature of food in a pot can be controlled more accurately and more constantly by using different high and low powers.
In order to achieve the above purpose, the invention provides the following technical scheme: a temperature control circuit for a furnace surface of an induction cooker comprises an EMC protection circuit, a rectification filter circuit, a zero-crossing detection circuit, a resonance circuit, an IGBT drive circuit and a main control chip circuit; the EMC protection circuit is connected with the rectifying and filtering circuit, the zero-cross detection circuit comprises a triode Q1, a resistor R1 and a resistor R2, a first pin of the triode Q1 is connected with a zero-cross signal receiving pin of the main control chip circuit, a second pin of the triode Q1 is connected with one end of a resistor R2, a third pin of the triode Q1 is connected with the other end of the resistor R2, one end of the resistor R1 is connected between a third pin of the triode Q1 and the resistor R2, and the zero-cross detection circuit is connected between the EMC protection circuit and the rectifying and filtering circuit through the other end of the resistor R1; one end of the resonant circuit is connected with the rectification filter circuit, and the other end of the resonant circuit is connected with the main control chip circuit through the IGBT driving circuit.
As a preferable scheme of the temperature control circuit of the oven surface of the induction cooker, the EMC protection circuit comprises a capacitor C1, and a capacitor C1 is connected between a zero line and a live line; the rectifying and filtering circuit comprises a rectifier, an inductor L1 and a capacitor C2, wherein an input pin of the rectifier is connected with the capacitor C1, a positive electrode output pin of the rectifier is connected with one end of the inductor L1, and a negative electrode output pin of the rectifier is connected with one end of the capacitor C2; the other end of the inductor L1 is connected with the other end of the capacitor C2.
As a preferable scheme of the temperature control circuit of the oven surface of the induction cooker, the resonance circuit comprises an inductor L2, a capacitor C3 and a power tube IGBT, one end of the inductor L2 and the capacitor C3 after being connected in parallel is connected between the inductor L1 and the capacitor C2, the other end of the inductor L2 and the capacitor C3 after being connected in parallel is connected to a first pin of the power tube IGBT, and a negative output pin of the rectifier and one end of the capacitor C2 are connected to a second pin of the power tube IGBT in common.
As a preferable scheme of the temperature control circuit of the oven surface of the induction cooker, the IGBT driving circuit comprises an IGBT driving chip, and a third pin of the IGBT of the power tube is connected with the IGBT driving chip.
As a preferable scheme of the temperature control circuit of the oven surface of the induction cooker, the ground is connected between the negative output pin of the rectifier and the capacitor C2, and the ground is connected between the second pin of the triode Q1 and the resistor R2.
The temperature control circuit of the surface of the induction cooker has the following advantages: in the temperature control circuit of the oven surface of the induction cooker, an EMC protection circuit is connected with a rectifying and filtering circuit, a zero-cross detection circuit comprises a triode Q1, a resistor R1 and a resistor R2, a first pin of the triode Q1 is connected with a zero-cross signal receiving pin of a main control chip circuit, a second pin of the triode Q1 is connected with one end of a resistor R2, a third pin of the triode Q1 is connected with the other end of the resistor R2, one end of the resistor R1 is connected between the third pin of the triode Q1 and the resistor R2, and the zero-cross detection circuit is connected between the EMC protection circuit and the rectifying and filtering circuit through the other end of the resistor R1; one end of the resonant circuit is connected with the rectifying and filtering circuit, and the other end of the resonant circuit is connected with the main control chip circuit through the IGBT driving circuit. According to the electromagnetic oven surface temperature control circuit, the mains supply zero-crossing detection is added, so that the IGBT zero-crossing starting is realized, the IGBT loss is reduced, and the IGBT temperature is reduced; the low-power non-intermittent heating function is realized, and the stable continuous heating can be realized at low power of 120W, 300W, 500W and the like.
The invention also provides a method for controlling the surface temperature of the induction cooker, which adopts the induction cooker surface temperature control circuit and comprises the following steps:
the method comprises the steps of obtaining a preset temperature of a user on the surface of the induction cooker, judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to be heated by adopting a high-power gear when the difference value between the current temperature and the preset temperature is not less than a first threshold value; when the difference value between the current temperature and the preset temperature is smaller than a first threshold and larger than a second threshold, controlling the surface of the induction cooker to be heated by adopting a medium-power gear;
judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to adopt continuous low-power intermittent heating when the difference value between the current temperature and the preset temperature is not greater than a second threshold value; when the difference value between the current temperature and the preset temperature is larger than a second threshold and smaller than a first threshold, controlling the surface of the induction cooker to maintain a medium-power gear for heating;
judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to stop continuous low-power intermittent heating when the current temperature exceeds the preset temperature; when the current temperature is reduced and does not exceed the preset temperature, controlling the surface of the induction cooker to be heated by adopting a preset low-power gear;
and when the current temperature rises and exceeds the preset temperature, controlling the surface of the induction cooker to stop heating at a preset low-power gear again.
As a preferred scheme of the electromagnetic oven surface temperature control method, under the high-power gear state, the output power of the electromagnetic oven is not less than 1600W; under the medium power gear state, the output power of the induction cooker is between 1000W and 1600W, and under the low power gear state, the output power of the induction cooker is smaller than 1000W.
As a preferred scheme of the method for controlling the surface temperature of the induction cooker, the low-power state of the induction cooker is divided into a plurality of low-power gears, and the low-power gears with different sizes are selected according to the size that the current temperature exceeds the preset temperature.
As a preferable mode of the method for controlling the surface temperature of the induction cooker, the continuous low-power intermittent heating is performed by switching the low-power gear from a substantially small gear.
As a preferred scheme of the control method of the surface temperature of the induction cooker, different low-power continuous heating is obtained by adopting different periods of switching-on duty ratios in a low-power state.
The method for controlling the surface temperature of the induction cooker has the following advantages: the method comprises the steps of obtaining the preset temperature of a user on the surface of the induction cooker, judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and heating and controlling the temperature in the pot of the induction cooker by adopting various power combinations so as to achieve more accurate and more stable temperature, wherein the temperature comprises high power, continuous medium power and continuous low-power intermittent heating of different gears; furthermore, different temperature requirements or different cooking functions can be divided into a plurality of stages, and different stages adopt different power outputs; the temperature of the cookware is controlled more accurately and more constantly, and the temperature of the cookware can reach +/-5 ℃ by laboratory measurement by adopting the corresponding cookware and food under specific temperature and air pressure; the demand of people on accurate control of the food temperature is greatly improved; by using the method, more foods such as warm milk, stewing and boiling, fried steak, popcorn and the like can be cooked, and the cooking requirements of various foods of people are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic diagram of a circuit for controlling a surface temperature of an induction cooker according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for controlling a surface temperature of an induction cooker according to an embodiment of the present invention;
fig. 3 is a continuous low-power control flow chart of a method for controlling the surface temperature of an induction cooker according to an embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a furnace surface temperature control circuit of an induction cooker is provided, which comprises an EMC protection circuit 1, a rectification filter circuit 2, a zero-crossing detection circuit 3, a resonance circuit 4, an IGBT drive circuit 5 and a main control chip circuit 6; the EMC protection circuit 1 is connected with the rectifying and filtering circuit 2, the zero-cross detection circuit 3 comprises a triode Q1, a resistor R1 and a resistor R2, a first pin of the triode Q1 is connected with a zero-cross signal receiving pin of the main control chip circuit 6, a second pin of the triode Q1 is connected with one end of a resistor R2, a third pin of the triode Q1 is connected with the other end of the resistor R2, one end of the resistor R1 is connected between the third pin of the triode Q1 and the resistor R2, and the zero-cross detection circuit 3 is connected between the EMC protection circuit 1 and the rectifying and filtering circuit 2 through the other end of the resistor R1; one end of the resonant circuit 4 is connected with the rectification filter circuit 2, and the other end of the resonant circuit 4 is connected with the main control chip circuit 6 through the IGBT driving circuit 5.
Specifically, the EMC protection circuit 1 includes a capacitor C1, and a capacitor C1 is connected between the zero line and the live line; the rectification filter circuit 2 comprises a rectifier, an inductor L1 and a capacitor C2, wherein an input pin of the rectifier is connected with the capacitor C1, a positive electrode output pin of the rectifier is connected with one end of the inductor L1, and a negative electrode output pin of the rectifier is connected with one end of the capacitor C2; the other end of the inductor L1 is connected with the other end of the capacitor C2. The resonant circuit 4 comprises an inductor L2, a capacitor C3 and a power tube IGBT, wherein one end of the inductor L2 is connected between the inductor L1 and the capacitor C2 after the inductor L3 and the capacitor C3 are connected in parallel, the other end of the inductor L2 is connected with the capacitor C3 after the inductor L2 and the capacitor C3 are connected in parallel is connected to a first pin of the power tube IGBT, and a negative electrode output pin of the rectifier and one end of the capacitor C2 are connected to a second pin of the power tube IGBT in common. The IGBT driving circuit 5 comprises an IGBT driving chip, and a third pin of the power tube IGBT is connected with the IGBT driving chip. The negative electrode output pin of the rectifier is grounded with the capacitor C2, and the second pin of the triode Q1 is grounded with the resistor R2.
Specifically, a first pin of the triode Q1 is connected to a zero-crossing signal receiving pin of the main control chip circuit 6, so that the main control chip circuit 6 can obtain a zero-crossing signal of the commercial power, and the main control chip circuit 6 processes the peripheral voltage, current and temperature signals to implement the circuit function according to a preset program. The IGBT driving circuit 5 converts and amplifies the small signal of the main control chip circuit 6 to form a signal suitable for the IGBT, so that the IGBT is driven to normally work.
Specifically, the EMC protection circuit 1 can prevent the damage of the circuit behind caused by high-frequency interference or lightning stroke at the entrance end of the power supply, because the input alternating current may contain noise waves with different frequencies, and meanwhile, the electromagnetic oven can also generate some high-frequency noise waves in the heating process, the interference in the alternating current input can be absorbed by utilizing the EMC protection circuit 1, and meanwhile, the work of other electrical appliances can also be prevented from being influenced by the work of the electromagnetic oven.
Specifically, the resonant circuit 4 adopts a form that an inductor L2 and a capacitor C3 are connected in parallel, the capacitor C3 discharges, the inductor L2 starts to have a reverse recoil current, and the inductor L2 charges; when the voltage of the inductor L2 reaches the maximum, the capacitor C3 finishes discharging, then the inductor L2 starts discharging, the capacitor C3 starts charging, and the reciprocating operation realizes resonance, and in the process, the inductor L2 generates electromagnetic waves due to continuous charging and discharging.
In the temperature control circuit of the oven surface of the induction cooker, an EMC protection circuit 1 is connected with a rectifying and filtering circuit 2, a zero-cross detection circuit 3 comprises a triode Q1, a resistor R1 and a resistor R2, a first pin of the triode Q1 is connected with a zero-cross signal receiving pin of a main control chip circuit 6, a second pin of the triode Q1 is connected with one end of a resistor R2, a third pin of the triode Q1 is connected with the other end of the resistor R2, one end of the resistor R1 is connected between the third pin of the triode Q1 and the resistor R2, and the zero-cross detection circuit 3 is connected between the EMC protection circuit 1 and the rectifying and filtering circuit 2 through the other end of the resistor R1; one end of the resonant circuit 4 is connected with the rectifying and filtering circuit 2, and the other end of the resonant circuit 4 is connected with the main control chip circuit 6 through the IGBT driving circuit 5. According to the electromagnetic oven surface temperature control circuit, mains supply zero-crossing detection is added, so that zero-crossing starting of the power tube IGBT is realized, the IGBT loss of the power tube is reduced, and the IGBT temperature of the power tube is reduced; the low-power non-intermittent heating function is realized, and the stable continuous heating can be realized at low power of 120W, 300W, 500W and the like.
Referring to fig. 2 and 3, the invention further provides a method for controlling the surface temperature of the induction cooker, which adopts the circuit for controlling the surface temperature of the induction cooker, and comprises the following steps:
s1, acquiring a preset temperature of a user on the surface of the induction cooker, judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to be heated by adopting a high-power gear when the difference value between the current temperature and the preset temperature is not less than a first threshold value; when the difference value between the current temperature and the preset temperature is smaller than a first threshold and larger than a second threshold, controlling the surface of the induction cooker to be heated by adopting a medium-power gear;
s2, judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to adopt continuous low-power intermittent heating when the difference value between the current temperature and the preset temperature is not greater than a second threshold value; when the difference value between the current temperature and the preset temperature is larger than a second threshold and smaller than a first threshold, controlling the surface of the induction cooker to maintain a medium-power gear for heating;
s3, judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to stop continuous low-power intermittent heating when the current temperature exceeds the preset temperature; when the current temperature is reduced and does not exceed the preset temperature, controlling the surface of the induction cooker to be heated by adopting a preset low-power gear;
and S4, when the current temperature rises and exceeds the preset temperature, controlling the surface of the induction cooker to stop heating at a preset low-power gear again.
Specifically, in the high-power gear state, the output power of the induction cooker is not less than 1600W; under the medium power gear state, the output power of the induction cooker is between 1000W and 1600W, and under the low power gear state, the output power of the induction cooker is smaller than 1000W.
Specifically, the low-power state of the induction cooker is divided into a plurality of low-power gears, and the low-power gears with different sizes are selected according to the size that the current temperature exceeds the preset temperature. Low power gears such as 800W, 500W, 300W and 120W. Because the commercial power zero-crossing detection circuit 3 is added to the electromagnetic oven surface temperature control circuit, the power tube IGBT zero-crossing starting is realized, the power tube IGBT loss is reduced, the power tube IGBT temperature is reduced, different low-power continuous heating is obtained by adopting different periods of switching-on duty ratios in a low-power state, and the stable continuous heating at low power of 120W, 300W, 500W, 800W and the like can be realized.
Specifically, the temperature in the pot can be controlled by adopting various power combinations to achieve more accurate and stable temperature, different temperature requirements or different cooking functions are divided into a plurality of stages, and different power outputs are adopted in different stages. For example, in the beginning stage, a preheating heating mode is adopted, namely when the difference between the temperature of food in the pot and the set temperature is large, high power is adopted for output. Immediately before the set temperature is reached, the output is performed by using continuous low power, such as 300W or 500W. After the set temperature is reached, continuous low-power intermittent heating temperature control is adopted, and heating is stopped when the temperature is exceeded and is performed when the temperature is lower than the set temperature.
For example, an induction cooker requires an accurate temperature control of 80 degrees of water in a pan. Firstly, the zero-crossing detection circuit 3 is adopted, the main control chip circuit 6 obtains a zero-crossing signal to control the power tube IGBT to start at zero crossing, so that the damage of the power tube IGBT is low, and the continuous low-power output required by 800W, 500W, 300W, 120W and the like can be realized. Secondly, the main control chip circuit 6 carries out AD detection on the temperature of the furnace surface, the current temperature in the pot is obtained through calculation, and if the temperature is less than 60 ℃, 1600W is used for carrying out high-power heating. In the high-power heating process, the water temperature in the boiler is continuously inquired, if the temperature in the boiler is 60-70 ℃, continuous low-power 800W heating is started, if the temperature in the boiler reaches 75 ℃, continuous low-power 500W heating is started, if the temperature in the boiler exceeds 80 ℃, continuous low-power 300W heating is started, if the temperature exceeds 82 ℃, heating is stopped, if the temperature is lower than 78 ℃, continuous low-power 300W heating is recovered, so that continuous inquiry circulation is continuously carried out, finally, the temperature of the water in the boiler is controlled between 78-82 ℃, a small temperature error and a relatively constant temperature are obtained, and therefore the requirements of users are met.
According to the method, the preset temperature of the oven surface of the induction cooker by a user is obtained, the preset temperature and the current temperature of the oven surface of the induction cooker are judged and compared, and when the difference value between the current temperature and the preset temperature is not smaller than a first threshold value, the oven surface of the induction cooker is controlled to be heated by adopting a high-power gear; when the difference value between the current temperature and the preset temperature is smaller than a first threshold and larger than a second threshold, controlling the surface of the induction cooker to be heated by adopting a medium-power gear; judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to adopt continuous low-power intermittent heating when the difference value between the current temperature and the preset temperature is not greater than a second threshold value; when the difference value between the current temperature and the preset temperature is greater than a second threshold value and smaller than a first threshold value, controlling the surface of the induction cooker to maintain a medium-power gear for heating; judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to stop continuous low-power intermittent heating when the current temperature exceeds the preset temperature; when the current temperature is reduced and does not exceed the preset temperature, controlling the surface of the induction cooker to be heated by adopting a preset low-power gear; when the current temperature rises and exceeds the preset temperature, the surface of the induction cooker is controlled again to stop heating at the preset low-power gear. The invention adopts various power combinations to heat and control the temperature in the induction cooker, so as to achieve more accurate and more stable temperature, including high power, continuous medium power and continuous low-power intermittent heating at different gears; furthermore, different temperature requirements or different cooking functions can be divided into a plurality of stages, and different stages adopt different power outputs; the temperature of the cookware is controlled more accurately and more constantly, and the temperature of the cookware can reach +/-5 ℃ by laboratory measurement by adopting the corresponding cookware and food under specific temperature and air pressure; the demand of people on accurate control of the food temperature is greatly improved; by using the method, more foods such as warm milk, stewing and boiling, fried steak, popcorn and the like can be cooked, and the cooking requirements of various foods of people are met.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The temperature control circuit of the surface of the induction cooker is characterized by comprising an EMC protection circuit, a rectifying and filtering circuit, a zero-crossing detection circuit, a resonance circuit, an IGBT driving circuit and a main control chip circuit; the EMC protection circuit is connected with the rectifying and filtering circuit, the zero-cross detection circuit comprises a triode Q1, a resistor R1 and a resistor R2, a first pin of the triode Q1 is connected with a zero-cross signal receiving pin of the main control chip circuit, a second pin of the triode Q1 is connected with one end of a resistor R2, a third pin of the triode Q1 is connected with the other end of the resistor R2, one end of the resistor R1 is connected between a third pin of the triode Q1 and the resistor R2, and the zero-cross detection circuit is connected between the EMC protection circuit and the rectifying and filtering circuit through the other end of the resistor R1; one end of the resonant circuit is connected with the rectification filter circuit, and the other end of the resonant circuit is connected with the main control chip circuit through the IGBT driving circuit.
2. The oven face temperature control circuit of claim 1, wherein the EMC protection circuit comprises a capacitor C1, the capacitor C1 is connected between the neutral line and the live line; the rectifying and filtering circuit comprises a rectifier, an inductor L1 and a capacitor C2, wherein an input pin of the rectifier is connected with the capacitor C1, a positive electrode output pin of the rectifier is connected with one end of the inductor L1, and a negative electrode output pin of the rectifier is connected with one end of the capacitor C2; the other end of the inductor L1 is connected with the other end of the capacitor C2.
3. The oven surface temperature control circuit of claim 2, wherein the resonant circuit comprises an inductor L2, a capacitor C3 and a power tube IGBT, one end of the inductor L2 connected in parallel with the capacitor C3 is connected between the inductor L1 and the capacitor C2, the other end of the inductor L2 connected in parallel with the capacitor C3 is connected to a first pin of the power tube IGBT, and a negative output pin of the rectifier and one end of the capacitor C2 are commonly connected to a second pin of the power tube IGBT.
4. The oven surface temperature control circuit of claim 3, wherein the IGBT driving circuit comprises an IGBT driving chip, and the third pin of the power tube IGBT is connected with the IGBT driving chip.
5. The circuit of claim 2, wherein the negative output pin of the rectifier is grounded to the capacitor C2, and the second pin of the transistor Q1 is grounded to the resistor R2.
6. A method for controlling the surface temperature of an induction cooker, which adopts the surface temperature control circuit of the induction cooker according to any one of claims 1 to 5, and is characterized by comprising the following steps:
the method comprises the steps of obtaining a preset temperature of a user on the surface of the induction cooker, judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to be heated by adopting a high-power gear when the difference value between the current temperature and the preset temperature is not less than a first threshold value; when the difference value between the current temperature and the preset temperature is smaller than a first threshold and larger than a second threshold, controlling the surface of the induction cooker to be heated by adopting a medium-power gear;
judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to adopt continuous low-power intermittent heating when the difference value between the current temperature and the preset temperature is not greater than a second threshold value; when the difference value between the current temperature and the preset temperature is larger than a second threshold and smaller than a first threshold, controlling the surface of the induction cooker to maintain a medium-power gear for heating;
judging and comparing the preset temperature with the current temperature of the surface of the induction cooker, and controlling the surface of the induction cooker to stop continuous low-power intermittent heating when the current temperature exceeds the preset temperature; when the current temperature is reduced and does not exceed the preset temperature, controlling the surface of the induction cooker to be heated by adopting a preset low-power gear;
and when the current temperature rises and exceeds the preset temperature, controlling the surface of the induction cooker to stop heating at a preset low-power gear again.
7. The method for controlling the surface temperature of the induction cooker according to claim 6, wherein in the high-power gear state, the output power of the induction cooker is not less than 1600W; under the medium power gear state, the output power of the induction cooker is between 1000W and 1600W, and under the low power gear state, the output power of the induction cooker is smaller than 1000W.
8. The method as claimed in claim 7, wherein the low power state of the induction cooker is divided into a plurality of low power gears, and different low power gears are selected according to the temperature of the current temperature exceeding the preset temperature.
9. The method as claimed in claim 8, wherein the continuous low-power intermittent heating is a low-power shift switching from a substantially small manner.
10. The method as claimed in claim 8, wherein the low power continuous heating is obtained by using different periods of on duty ratios in the low power state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110149741.6A CN112859958A (en) | 2021-02-03 | 2021-02-03 | Induction cooker surface temperature control circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110149741.6A CN112859958A (en) | 2021-02-03 | 2021-02-03 | Induction cooker surface temperature control circuit and method |
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| CN112859958A true CN112859958A (en) | 2021-05-28 |
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| CN202110149741.6A Pending CN112859958A (en) | 2021-02-03 | 2021-02-03 | Induction cooker surface temperature control circuit and method |
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2021
- 2021-02-03 CN CN202110149741.6A patent/CN112859958A/en active Pending
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