Self-induction induction cooker glass panel and induction cooker
By dividing the heating of the glass panel into multiple self-inductance areas and setting the thermistor, the problem that the induction cooker cannot effectively detect the temperature at the bottom of the kitchen utensil is solved, achieving more accurate temperature control and safety improvement.
Patent Information
- Application Number
- CN202422952666.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The existing induction cooker cannot effectively detect the temperatures everywhere at the bottom of the kitchen utensils, resulting in excessive temperature difference between overheating spots and glass panels, posing safety hazards and shortening service life.
The heating area of the glass panel is divided into multiple self-inductive areas, and at least one thermistor is set in each self-inductive area, which is electrically connected to the thermistor through a printed circuit, which is used to detect the temperatures in various places at the bottom of the kitchenware and according to the detection. As a result, the load power is adjusted to prevent excessive heat spots and temperature differences.
It realizes more accurate temperature detection and control, improves safety and service life, avoids overheating spots and excessive temperature differences, and improves the cooking experience.
Smart Images
Figure CN222278677U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of household appliances, and in particular to a self-induction induction cooker glass panel and an induction cooker. Background Art
[0002] In order to prevent the water in the kitchenware from drying up or the bottom of the kitchenware from being uneven, which may cause the local temperature on the surface of the induction cooker to be too high, the existing induction cooker usually sets a fixed or retractable thermistor in the middle of the induction cooker coil to detect the temperature of the bottom of the kitchenware in real time, and adjust the power or automatically shut down according to the detection results.
[0003] However, this solution has some problems. When the bottom of the kitchenware is concave in the middle, the fixed thermistor cannot contact the bottom of the kitchenware, and thus cannot effectively detect the actual temperature of the bottom of the kitchenware. Some kitchenware bottoms are designed to be concave in the middle with convex edges, or even if the bottom is designed to be flat, the middle may be concave due to being dropped or bumped during use.
[0004] Although the thermistor that can be extended up and down can reliably contact the bottom of the cookware and effectively detect the actual temperature in the middle of the bottom of the cookware, for cookware with an uneven bottom, the temperature at the position in contact with the upper surface of the induction cooker is usually much higher than the temperature at the position not in contact with the upper surface of the induction cooker. This will cause "hot spots" to appear at the position in contact with the upper surface of the induction cooker, which greatly increases the risk of the bottom of the cookware being burned through and the surface of the induction cooker being damaged.
[0005] In addition, due to the low cost of glass panels, some induction cookers use glass panels. However, glass panels have the following disadvantages: when the temperature difference between different positions on the glass panel is large, the glass panel will burst; the solution of setting a single thermistor in the prior art cannot detect the temperature difference between different positions of the glass panel, and thus cannot prevent the occurrence of excessive temperature differences.
[0006] The existing technology cannot effectively detect the temperature of various locations on the bottom of the kitchenware, and it is difficult to prevent the generation of hot spots and the excessive temperature difference between different locations of the glass panel, which poses a safety hazard and shortens the service life. Therefore, there is an urgent need for a self-sensing induction cooker glass panel and an induction cooker that can effectively detect the temperature of various locations on the bottom of the kitchenware to solve the above technical problems.
[0007] In view of the above problems, the existing technology needs to be improved urgently. Utility Model Content
[0008] The purpose of the present application is to provide a self-sensing induction cooker glass panel and an induction cooker, which can effectively detect the temperature of various locations on the bottom of the kitchenware to prevent the generation of hot spots and excessive temperature differences between different locations of the glass panel.
[0009] In a first aspect, the present application provides a self-induction induction cooker glass panel, comprising a glass substrate, the glass substrate having a heating zone; the heating zone is divided into a plurality of self-induction zones, at least one thermistor is arranged on the back side of the glass substrate in each of the self-induction zones, and a printed circuit and a first insulating coating are also arranged on the back side of the glass substrate; the printed circuit is electrically connected to each of the thermistors and is used to input a working voltage to each of the thermistors and output an output current of each of the thermistors; the first insulating coating covers the thermistors and the printed circuit; the printed circuit is made of a conductive material that is not affected by electromagnetic waves.
[0010] By dividing the heating area of the glass substrate into multiple self-sensing areas and arranging at least one thermistor in each self-sensing area, the temperature of various locations on the bottom of the cookware can be effectively detected, so that the power regulation circuit of the induction cooker can adjust the load power according to the detection results of each thermistor, thereby preventing the generation of hot spots and excessive temperature differences between different locations of the glass panel, thereby improving safety and service life.
[0011] Preferably, the printed circuit is made of polyimide material.
[0012] Preferably, the self-sensing zone includes a first self-sensing zone located in the middle of the heating zone and a plurality of second self-sensing zones evenly arranged around the first self-sensing zone.
[0013] This layout has the following advantages: improving the coverage of temperature detection, enhancing the accuracy of temperature detection, achieving more uniform temperature control, and adapting to cooking utensils of different sizes. Through this layout design of the self-sensing area, the self-sensing induction cooker glass panel can better solve the problem of temperature detection and control, improve the uniformity and accuracy of heating, and thus improve the user's cooking experience.
[0014] Preferably, eight self-sensing areas are provided, and one thermistor is provided in each of the self-sensing areas.
[0015] Preferably, a second insulating coating is further provided between the glass substrate, the thermistor and the printed circuit.
[0016] The second insulating coating can effectively prevent direct contact between the glass substrate and electrical components, reduce the risk of short circuits, and improve overall electrical safety.
[0017] In the second aspect, the present application provides an induction cooker, comprising a power supply circuit, an induction cooker coil, a resonant circuit, a power regulation circuit and a glass panel, wherein the induction cooker coil and the resonant circuit are connected in parallel as a load to the output end of the power supply circuit; the glass panel is the self-inductance induction cooker glass panel described above; the power regulation circuit is electrically connected to the power supply circuit, the load and the glass panel, and is used to adjust the power of the load according to the output current of each thermistor.
[0018] Preferably, the power regulation circuit comprises a switch tube, a PWM chip, a current comparison circuit and a DC driving power supply, wherein the DC driving power supply is used to provide an operating voltage to the glass panel, the current comparison circuit is electrically connected to the glass panel and the PWM chip, the PWM chip is also electrically connected to the gate of the switch tube, the switch tube is connected in series with the load, one of the drain and the source of the switch tube is connected to one end of the load, and the other of the drain and the source of the switch tube is connected to an output end of the power supply circuit;
[0019] The current comparison circuit is used to compare the output currents of the thermistors to generate an adjustment signal and send it to the PWM chip; the PWM chip is used to output a PWM signal according to the adjustment signal to control the on and off of the switch tube.
[0020] Preferably, the current comparison circuit comprises a plurality of first comparators, a plurality of first comparison modules, a second comparison module, a first adjustment signal output terminal and a second adjustment signal output terminal, the number of the first comparators is the same as the number of the thermistors, each of the first comparators is electrically connected to an output terminal of an output current of each thermistor in a one-to-one correspondence, all of the first comparators are electrically connected to the first adjustment signal output terminal, each of the first comparators is divided into a plurality of groups and is electrically connected to each of the first comparison modules respectively, all of the first comparison modules are electrically connected to the second comparison module and the second adjustment signal output terminal, and the second comparison module is also electrically connected to the first adjustment signal output terminal and the second adjustment signal output terminal;
[0021] The first comparator is used to compare the input output current with a preset current upper limit value, and output a first adjustment signal to the first adjustment signal output terminal when the input output current is greater than or equal to the current upper limit value, and output the input output current as the first current to the corresponding first comparison module when the input output current is less than the current upper limit value; the first adjustment signal is used to enable the PWM chip to control the switch tube to reduce the power of the load;
[0022] The first comparison module is used to extract the maximum current and the minimum current from the first input current as the second current output to the second comparison module, and output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation between the first input currents is greater than or equal to a preset deviation upper limit value; the second adjustment signal is used to enable the PWM chip to control the switch tube to reduce the power of the load;
[0023] The second comparison module is used to output the first adjustment signal to the first adjustment signal output terminal when the maximum current among the second input currents is greater than or equal to the current upper limit value, and to output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation between the second input currents is greater than or equal to the deviation upper limit value.
[0024] Preferably, the first comparison module includes a second comparator and a third comparator; the second comparator includes a plurality of input terminals and at least three output terminals, wherein each input terminal is electrically connected to the corresponding first comparator, the first output terminal and the second output terminal are both electrically connected to the second comparison module, the third output terminal is electrically connected to the input terminal of the third comparator, and the output terminal of the third comparator is electrically connected to the second adjustment signal output terminal;
[0025] The second comparator is used to extract the maximum current and the minimum current from the first input current and output them from its own first output terminal and second output terminal respectively, and to calculate the maximum deviation between the first input currents and output them from its own third output terminal; the third comparator is used to compare the maximum deviation output by the second comparator with the upper limit value of the deviation, and output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation output by the second comparator is greater than or equal to the upper limit value of the deviation.
[0026] Preferably, the second comparison module includes a fourth comparator, a fifth comparator and a sixth comparator, the fourth comparator has a plurality of input terminals and at least two output terminals, wherein each input terminal is electrically connected to each first comparison module, a first output terminal is electrically connected to the first adjustment signal output terminal through the fifth comparator, and a second output terminal is electrically connected to the second adjustment signal output terminal through the sixth comparator;
[0027] The fourth comparator is used to extract the maximum current from the second input current and output it from its own first output terminal, and to calculate the maximum deviation between the second input current and output it from its own second output terminal; the fifth comparator is used to compare the maximum current output by the fourth comparator with the current upper limit value, and output the first adjustment signal to the first adjustment signal output terminal when the maximum current output by the fourth comparator is greater than or equal to the current upper limit value; the sixth comparator is used to compare the maximum deviation output by the fourth comparator with the deviation upper limit value, and output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation output by the fourth comparator is greater than or equal to the deviation upper limit value.
[0028] Beneficial effects: The self-inductive induction cooker glass panel and induction cooker provided by the present application can effectively detect the temperature of various locations on the bottom of the kitchenware by dividing the heating area of the glass substrate into multiple self-inductive areas and arranging at least one thermistor in each self-inductive area, so that the power regulation circuit of the induction cooker can adjust the load power according to the detection results of each thermistor, thereby preventing the generation of hot spots and excessive temperature differences between different positions of the glass panel, thereby improving safety and service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 This is a bottom view of the self-induction induction cooker glass panel provided in an embodiment of the present application.
[0030] Figure 2 A top view of the self-induction induction cooker glass panel provided in an embodiment of the present application.
[0031] Figure 3 A cross-sectional view of the self-induction induction cooker glass panel provided in an embodiment of the present application.
[0032] Figure 4 This is a circuit diagram of the induction cooker provided in an embodiment of the present application.
[0033] Figure 5 It is a structural diagram of the current comparison circuit.
[0034] Explanation of reference numerals: 1. glass substrate; 101. heating zone; 102. self-inductance zone; 2. thermistor; 3. printed circuit; 4. first insulating coating; 6. second insulating coating; 8. power supply circuit; 801. rectifier bridge; 802. choke; 803. capacitor; 9. induction cooker coil; 10. resonant circuit; 11. power regulation circuit; 1101. switch tube; 1102. PWM chip; 1103. current comparison circuit; 1104. gate drive circuit; 12. glass panel; 13. load; 14. first comparator; 15. first comparison module; 1501. second comparator; 1502. third comparator; 16. second comparison module; 1601. fourth comparator; 1602. fifth comparator; 1603. sixth comparator. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.
[0036] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0037] In induction cooker applications, accurate detection of the temperature at the bottom of cookware is critical to ensure cooking safety and performance. However, existing single-point temperature detection methods have significant limitations. When using fixed thermistors, for cookware with concave bottoms, the resistors may not be able to effectively contact the bottom of the cookware, resulting in inaccurate temperature measurements. Although retractable thermistors can solve the contact problem, they can still only detect the temperature at a single point and cannot fully reflect the temperature distribution across the entire bottom of the cookware. This single-point detection method is particularly problematic when facing cookware with uneven bottoms, because local hot spots may form in the area where the cookware contacts the surface of the induction cooker, and these hot spots are often outside the single-point detection range. In this case, the system may not be able to detect and respond to temperature anomalies in a timely manner, greatly increasing safety risks.
[0038] In addition, when the panel of the induction cooker is a glass panel, if the temperature difference between different positions on the glass panel is too large, the glass panel will burst; the existing single-point temperature detection method cannot effectively detect the temperature difference between different positions of the glass panel, and thus cannot prevent the occurrence of excessive temperature differences.
[0039] To solve the above problems, the present application proposes an innovative glass panel design.
[0040] Please refer to Figure 1-Figure 3 In some embodiments of the present application, a self-induction induction cooker glass panel includes a glass substrate 1, wherein the glass substrate 1 has a heating area 101; the heating area 101 is divided into a plurality of self-induction areas 102, and at least one thermistor 2 is arranged on the back of the glass substrate 1 in each of the self-induction areas 102, and a printed circuit 3 and a first insulating coating 4 are also arranged on the back of the glass substrate 1; the printed circuit 3 is electrically connected to each of the thermistors 2 (the printed circuit 3 is electrically connected to each of the thermistors 2 to form a temperature measurement circuit), and is used to input a working voltage to each of the thermistors 2 and output an output current of each of the thermistors 2; the first insulating coating 4 covers the thermistors 2 and the printed circuit 3; the printed circuit 3 is made of a conductive material that is not affected by electromagnetic waves.
[0041] By dividing the heating area 101 of the glass substrate 1 into a plurality of self-sensing areas 102 and arranging at least one thermistor 2 in each self-sensing area 102, the temperature at various locations on the bottom of the cookware can be effectively detected, so that the power regulating circuit 11 of the induction cooker can adjust the load power according to the detection results (output current) of each thermistor 2, thereby preventing the generation of hot spots and the excessive temperature difference between different positions of the glass panel, thereby improving the safety and service life. Among them, the printed circuit 3 is made of a conductive material that is not affected by electromagnetic waves, and the magnetic field generated by the induction cooker coil and the printed circuit 3 will not interfere with each other, which ensures the accuracy of the temperature detection result on the one hand, and prevents the printed circuit 3 from shielding the magnetic field generated by the induction cooker coil, which leads to a decrease in the heating efficiency of the induction cooker.
[0042] Specifically, through multi-point temperature measurement, the limitations of traditional single-point temperature detection are overcome, and the temperature distribution at the bottom of the kitchenware can be monitored more comprehensively; the printed circuit 3 is electrically connected to each thermistor 2 to provide a working voltage and read the output current, which enables the system to obtain the temperature information of each self-sensing area 102 in real time; the first insulating coating 4 covers the thermistor 2 and the printed circuit 3, playing a role of electrical isolation and protection.
[0043] The printed circuit 3 can be made of polyimide material or other inorganic conductive materials. Polyimide is an excellent conductive material with high conductivity and low magnetism. Even if it is used in a high-frequency induction cooker, it will not be disturbed by the magnetic field generated by the induction cooker coil, thereby ensuring the normal operation of the circuit.
[0044] The number, shape, size and distribution position of the self-sensing area 102 can be set according to actual needs. The number of thermistors 2 in each self-sensing area 102 can be set according to actual needs. Figure 1 In the embodiment, there are eight self-sensing regions 102 , and a thermistor 2 is disposed in each self-sensing region 102 , but the present invention is not limited thereto.
[0045] In some preferred embodiments, see Figure 1 The self-sensing area 102 includes a first self-sensing area (such as Figure 1 The circular area in the middle) and a plurality of second self-sensing areas (such as Figure 1 The fan-shaped area surrounding the central circular area).
[0046] This layout has the following advantages: improving the coverage of temperature detection, enhancing the accuracy of temperature detection, achieving more uniform temperature control, and adapting to cooking utensils of different sizes. Through the layout design of the self-sensing area 102, the self-sensing induction cooker glass panel can better solve the problem of temperature detection and control, improve the uniformity and accuracy of heating, and thus improve the user's cooking experience.
[0047] The specific number and number of circles of the second self-sensing areas can be set according to actual needs; the second self-sensing areas can be arranged in a single circle or multiple circles, and the number of second self-sensing areas in each circle can be adjusted according to actual needs. Figure 1 In the embodiment, one first self-inductive region is provided, seven second self-inductive regions are provided, and the seven second self-inductive regions are arranged in a single circle; but the present invention is not limited thereto.
[0048] Further, see Figure 3 A second insulating coating 6 may be provided between the glass substrate 1 and the thermistor 2 and the printed circuit 3 .
[0049] The second insulating coating 6 can effectively prevent direct contact between the glass substrate 1 and electrical components, reduce the risk of short circuit, and improve overall electrical safety.
[0050] Among them, the second insulating coating 6 can be made of a variety of materials. Common materials include high-performance insulating materials such as epoxy resin, polyimide, and fluoropolymer. These materials have excellent heat resistance, insulation and chemical stability. The thickness of the second insulating coating 6 can be set according to actual needs.
[0051] refer to Figure 4 , Figure 5 The present application also provides an induction cooker, including a power supply circuit 8, an induction cooker coil 9, a resonant circuit 10, a power regulation circuit 11 and a glass panel 12. The induction cooker coil 9 and the resonant circuit 10 are connected in parallel as a load 13 connected to the output end of the power supply circuit 8; the glass panel 12 is the self-inductance induction cooker glass panel mentioned above; the power regulation circuit 11 is electrically connected to the power supply circuit 8, the load 13 and the glass panel 12, and is used to adjust the power of the load 13 according to the output current of each thermistor 2.
[0052] The power regulating circuit 11 can obtain the output current information of the thermistor 2 by being electrically connected to the power circuit 8, the load 13 and the glass panel 12. These thermistors 2 are distributed in different self-sensing areas 102 of the glass panel 12, and can accurately reflect the temperature changes in each area. The power regulating circuit 11 adjusts the power of the load 13 according to the current information, thereby realizing accurate control of the heating power, which is conducive to preventing the generation of hot spots and the occurrence of excessive temperature differences between different positions of the glass panel 12.
[0053] The induction cooker coil 9 and the resonant circuit 10 are prior art and will not be described in detail here.
[0054] In the present application, the power regulation circuit 11 can be implemented in a variety of ways.
[0055] For example Figure 4 In the embodiment, the power regulation circuit 11 includes a switch tube 1101, a PWM chip 1102, a current comparison circuit 1103 and a DC driving power supply VDD. The DC driving power supply VDD is used to provide an operating voltage to the glass panel 12. The current comparison circuit 1103 is electrically connected to the glass panel 12 and the PWM chip 1102. The PWM chip 1102 is also electrically connected to the gate of the switch tube 1101. The switch tube 1101 is connected in series with the load 13. One of the drain and the source of the switch tube 1101 is connected to one end of the load 13, and the other of the drain and the source of the switch tube 1101 is connected to an output end of the power supply circuit 8.
[0056] The current comparison circuit 1103 is used to compare the output currents of the thermistors 2 to generate an adjustment signal and send it to the PWM chip 1102 ; the PWM chip 1102 is used to output a PWM signal according to the adjustment signal to control the on / off of the switch tube 1101 .
[0057] Among them, the DC driving power supply VDD provides the working voltage for the glass panel 12 to ensure the normal operation of the thermistor 2; the current comparison circuit 1103 compares the output current of each thermistor 2 to generate an adjustment signal to reflect the temperature of each sensing area 102; the PWM chip 1102 outputs a PWM signal according to the adjustment signal to control the conduction state of the switch tube 1101; the switch tube 1101, as a power control element, controls the power of the load 13 by adjusting the proportion of the on-off time. These components cooperate with each other to achieve the purpose of accurately adjusting the power of the load 13 according to the temperature of each sensing area 102 of the glass panel 12. The current comparison circuit 1103 integrates the temperature information of multiple thermistors 2 into an adjustment signal, and the PWM chip 1102 converts this signal into a PWM signal that can control the switch tube 1101 (specifically controlling the duty cycle of the PWM signal), and finally adjusts the power of the load 13 through the switch state of the switch tube 1101.
[0058] Preferably, see Figure 4 A gate driving circuit 1104 may also be connected between the PWM chip 1102 and the gate of the switch tube 1101. The gate driving circuit 1104 is used to output a corresponding level signal to the gate of the switch tube 1101 according to the PWM signal to drive the gate of the switch tube 1101 to be turned on and off; thereby reducing the restriction on the level of the output signal of the PWM chip 1102, ensuring the reliable operation of the switch tube 1101, and expanding the optional range of the PWM chip 1102.
[0059] There are many ways to implement the current comparison circuit 1103. One possible implementation is to use multiple operational amplifiers as comparators, each comparator corresponding to a thermistor 2. Another way is to use a dedicated analog multiplexer and a single high-precision comparator to compare the output currents of the thermistors in turn by time division multiplexing.
[0060] Figure 5A possible implementation of the current comparison circuit 1103 is shown, wherein the current comparison circuit 1103 includes a plurality of first comparators 14, a plurality of first comparison modules 15, a second comparison module 16, a first adjustment signal output terminal O1 and a second adjustment signal output terminal O2 (specifically, the first adjustment signal output terminal O1 and the second adjustment signal output terminal O2 are electrically connected to the PWM chip 1102), the number of the first comparators 14 is the same as the number of thermistors 2, and each first comparator 14 is connected to the output terminal of the output current of each thermistor 2 (on the glass panel of the self-inductance induction cooker). An output terminal corresponding to each thermistor 2 is provided, and is used to output the output current of the thermistor 2) and is electrically connected in a one-to-one correspondence, all first comparators 14 are electrically connected to the first adjustment signal output terminal O1, each first comparator 14 is divided into a plurality of groups and is electrically connected to each first comparison module 15 (each first comparison module 15 is electrically connected to a group of first comparators 14), all first comparison modules 15 are electrically connected to the second comparison module 16 and the second adjustment signal output terminal O2, and the second comparison module 16 is also electrically connected to the first adjustment signal output terminal O1 and the second adjustment signal output terminal O2;
[0061] The first comparator 14 is used to compare the input output current (such as I1 to I8 in the figure) with a preset current upper limit value (the current upper limit value is equal to the output current of the thermistor 2 under a preset temperature threshold condition, and the current upper limit value is specifically determined by the temperature threshold value and the performance of the thermistor 2. The temperature threshold value can be set according to actual needs, for example, 200°C, but not limited thereto), output a first adjustment signal to the first adjustment signal output terminal O1 when the input output current is greater than or equal to the current upper limit value, and output the input output current as the first current to the corresponding first comparison module 15 when the input output current is less than the current upper limit value; the first adjustment signal is used to enable the PWM chip 1102 to control the switch tube 1101 to reduce the power of the load 13;
[0062] The first comparison module 15 is used to extract the maximum current and the minimum current from the input first current as the second current output to the second comparison module 16, and output the second adjustment signal to the second adjustment signal output terminal O2 when the maximum deviation between the input first currents (i.e. the maximum value of the deviation between the input first currents) is greater than or equal to a preset upper deviation limit value (the upper deviation limit value is equal to the deviation of the output current generated by the thermistor 2 under the preset temperature deviation threshold condition, the temperature deviation threshold value is set according to the temperature deviation that the glass panel 12 can withstand, for example, the temperature deviation threshold value is △T, then the deviation between the output current generated by the thermistor 2 under the reference temperature T0 and the output current generated at the temperature of T0+△T can be used as the upper deviation limit value, the reference temperature T0 can be set according to actual needs, for example, 20℃-25℃, but not limited thereto); the second adjustment signal is used to enable the PWM chip 1102 to control the switch tube 1101 to reduce the power of the load 13;
[0063] The second comparison module 16 is used to output a first adjustment signal to the first adjustment signal output terminal O1 when the maximum current among the input second currents is greater than or equal to the current upper limit value, and to output a second adjustment signal to the second adjustment signal output terminal O2 when the maximum deviation between the input second currents (i.e., the maximum value of the deviation between the input second currents) is greater than or equal to the deviation upper limit value.
[0064] The current comparison circuit 1103 realizes accurate monitoring and control of the temperature of multiple self-sensing areas 102 through multi-level comparison and judgment. The first comparator 14 makes a preliminary judgment on the output current of each thermistor 2. When the temperature of a certain area is too high, it immediately outputs a first adjustment signal to reduce the power to achieve rapid response. The first comparison module 15 compares the temperature of a group of self-sensing areas 102, extracts the maximum and minimum temperatures, and judges the temperature difference. In this way, local overheating or uneven temperature distribution can be detected. The second comparison module 16 makes an overall comparison and judgment on the temperature of all self-sensing areas 102, and can fully grasp the temperature status of the entire heating area 101. Through this multi-level comparison and judgment structure, the current comparison circuit 1103 can monitor the temperature of multiple self-sensing areas 102 at the same time, and output corresponding adjustment signals according to different situations. This design can not only quickly respond to temperature anomalies in a single area, but also take into account the overall temperature distribution, and realize accurate and comprehensive temperature monitoring and power regulation.
[0065] The current comparison circuit 1103 of the present application can be implemented in a variety of ways. The first comparator 14 can be a voltage comparator circuit constructed by an operational amplifier, or a dedicated comparator chip can be used. The first comparison module 15 can be composed of multiple comparators and logic gate circuits, or can be implemented using a microcontroller or FPGA. The second comparison module 16 can adopt a structure similar to the first comparison module 15, or a more complex digital signal processor can be used to achieve more sophisticated comparison and judgment.
[0066] Among them, the first adjustment signal can be a uniform level signal, or a level signal that is proportional to a current greater than or equal to a current upper limit value that causes the first adjustment signal to be sent (for example, the maximum current of the output current that causes the first comparator 14 to send the first adjustment signal and the second current that causes the second comparison module 16 to send the first adjustment signal); for the former, the PWM chip 1102 can reduce the power of the load 13 according to a preset ratio, and for the latter, the PWM chip 1102 can adjust the amount of power reduction of the load 13 according to the level of the first adjustment signal.
[0067] Similarly, the second adjustment signal can be a uniform level signal, or a level signal that is proportional to a current deviation that is greater than or equal to a deviation upper limit value that causes the second adjustment signal to be sent (for example, the maximum deviation between the first current that causes the first comparison module 15 to send the second adjustment signal, and the maximum deviation between the second current that causes the second comparison module 16 to send the second adjustment signal); for the former, the PWM chip 1102 can reduce the power of the load 13 according to a preset ratio (the ratio can be the same as or different from the ratio corresponding to the first adjustment signal), and for the latter, the PWM chip 1102 can adjust the amount of power reduction of the load 13 according to the level of the second adjustment signal.
[0068] In some embodiments, see Figure 5 , the first comparison module 15 includes a second comparator 1501 and a third comparator 1502; the second comparator 1501 includes a plurality of input terminals and at least three output terminals, wherein each input terminal is electrically connected to the corresponding first comparator 14, the first output terminal (such as the H terminal of the second comparator 1501 in the figure) and the second output terminal (such as the L terminal of the second comparator 1501 in the figure) are both electrically connected to the second comparison module 16, the third output terminal (such as the △ terminal of the second comparator 1501 in the figure) is electrically connected to the input terminal of the third comparator 1502, and the output terminal of the third comparator 1502 is electrically connected to the second adjustment signal output terminal O2;
[0069] The second comparator 1501 is used to extract the maximum current and the minimum current from the input first current and output them from its own first output terminal and second output terminal respectively, and to calculate the maximum deviation between the input first currents and output them from its own third output terminal; the third comparator 1502 is used to compare the maximum deviation and the upper limit value of the deviation output by the second comparator 1501, and output the second adjustment signal to the second adjustment signal output terminal O2 when the maximum deviation output by the second comparator 1501 is greater than or equal to the upper limit value of the deviation.
[0070] The first comparison module 15 realizes the processing and comparison of the input first current through the cooperation of the second comparator 1501 and the third comparator 1502. The second comparator 1501 has multiple input terminals and at least three output terminals, which can receive multiple first current inputs, and extract the maximum current and the minimum current from them to output to the second comparison module 16, and calculate the maximum deviation to output to the third comparator 1502. This design can effectively process multiple input signals and extract key information. The third comparator 1502 is responsible for comparing the maximum deviation output by the second comparator 1501 with the preset upper limit of the deviation, and outputs the second adjustment signal when the deviation is too large. This design can monitor the deviation between the currents of each channel and detect abnormal conditions in time. Among them, the second comparator 1501 can use a multi-stage comparator.
[0071] In some embodiments, see Figure 5 The second comparison module 16 includes a fourth comparator 1601, a fifth comparator 1602 and a sixth comparator 1603, the fourth comparator 1601 has a plurality of input terminals and at least two output terminals, wherein each input terminal is electrically connected to each first comparison module 15 (specifically connected to the first output terminal and the second output terminal of each second comparator 1501), the first output terminal (the H terminal of the fourth comparator 1601 in the figure) is electrically connected to the first adjustment signal output terminal O1 through the fifth comparator 1602, and the second output terminal (the △ terminal of the fourth comparator 1601 in the figure) is electrically connected to the second adjustment signal output terminal O2 through the sixth comparator 1603;
[0072] The fourth comparator 1601 is used to extract the maximum current from the input second current and output it from its own first output terminal, and to calculate the maximum deviation between the input second current and output it from its own second output terminal; the fifth comparator 1602 is used to compare the maximum current output by the fourth comparator 1601 and the current upper limit value, and output the first adjustment signal to the first adjustment signal output terminal O1 when the maximum current output by the fourth comparator 1601 is greater than or equal to the current upper limit value; the sixth comparator 1603 is used to compare the maximum deviation output by the fourth comparator 1601 and the deviation upper limit value, and output the second adjustment signal to the second adjustment signal output terminal O2 when the maximum deviation output by the fourth comparator 1601 is greater than or equal to the deviation upper limit value.
[0073] The fourth comparator 1601 is a core component responsible for processing the input signals from each first comparison module 15. It can extract the maximum current value from the input second current and calculate the maximum deviation between the second currents. These two key data are output from the two output terminals of the fourth comparator 1601, respectively, to provide a basis for subsequent comparison and judgment. The fifth comparator 1602 and the sixth comparator 1603 are responsible for performing specific comparison operations respectively. The fifth comparator 1602 compares the maximum current with the preset current upper limit value, and outputs a first adjustment signal when the upper limit is exceeded. The sixth comparator 1603 compares the maximum deviation with the preset deviation upper limit value, and outputs a second adjustment signal when the upper limit is exceeded. The output signals of the two comparators are directly connected to the corresponding adjustment signal output terminals, which are used to control the PWM chip 1102 to drive the gate of the switch tube 1101 to open and close. Through this design, the second comparison module 16 can effectively monitor and evaluate the state of the input current, and trigger an appropriate adjustment signal when necessary. This precise control mechanism enables the induction cooker to respond to temperature changes more sensitively and accurately, thereby achieving more refined power regulation. The fourth comparator 1601 may be a multi-stage comparator.
[0074] It should be noted that the first comparators 14 can be grouped in equal or unequal ways, and the number of groups and the number of first comparators 14 in each group can be adjusted according to actual needs; accordingly, the number of first comparison modules 15 and the number of input terminals of the second comparators 1501 therein can be adjusted according to actual needs, and the number of input terminals of the fourth comparator 1601 can be adjusted according to actual needs.
[0075] For example Figure 1-Figure 5 In the embodiment, eight thermistors 2 are provided, eight first comparators 14 are provided correspondingly, the first comparators 14 are evenly divided into two groups, two first comparison modules 15 are provided, the second comparator 1501 is a fourth-order comparator, and the fourth comparator 1601 is a fourth-order comparator.
[0076] In one possible implementation, see Figure 4 The power supply circuit 8 includes a rectifier bridge 801, a choke 802 and a capacitor 803. The rectifier bridge 801 and the choke 802 are connected in series, and the ends of the rectifier bridge 801 and the choke 802 that are far away from each other serve as two output ends of the power supply circuit 8 respectively, and the two ends of the capacitor 803 are respectively connected to the two output ends of the power supply circuit 8.
[0077] The function of the rectifier bridge 801 is to convert AC power into DC power; the choke is mainly used to suppress the common-mode interference signal in the power supply; and the capacitor 803 is used to filter out the AC component in the output current of the power supply circuit 8 .
[0078] Preferably, the capacitor 803 is a polarized capacitor, which has the advantages of large capacity, small size, and high withstand voltage.
[0079] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.
[0080] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A self-induction induction cooker glass panel, comprising a glass substrate (1), wherein the glass substrate (1) has a heating area (101); characterized in that: The heating area (101) is divided into a plurality of self-sensing areas (102); at least one thermistor (2) is arranged in each of the self-sensing areas (102) on the back side of the glass substrate (1); a printed circuit (3) and a first insulating coating (4) are also arranged on the back side of the glass substrate (1); the printed circuit (3) is electrically connected to each of the thermistors (2) and is used to input a working voltage to each of the thermistors (2) and output an output current of each of the thermistors (2); the first insulating coating (4) covers the thermistors (2) and the printed circuit (3); and the printed circuit (3) is made of a conductive material that is not affected by electromagnetic waves.
2. The self-induction induction cooker glass panel according to claim 1, characterized in that: The printed circuit (3) is made of polyimide material.
3. The self-induction induction cooker glass panel according to claim 1, characterized in that: The self-sensing region (102) comprises a first self-sensing region located in the middle of the heating region (101) and a plurality of second self-sensing regions evenly arranged around the first self-sensing region.
4. The self-induction induction cooker glass panel according to claim 3, characterized in that: Eight self-sensing regions (102) are provided, and one thermistor (2) is provided in each of the self-sensing regions (102).
5. The self-induction induction cooker glass panel according to claim 1, characterized in that: A second insulating coating (6) is also provided between the glass substrate (1), the thermistor (2) and the printed circuit (3).
6. An induction cooker, comprising a power supply circuit (8), an induction cooker coil (9), a resonant circuit (10), a power regulation circuit (11) and a glass panel (12), wherein the induction cooker coil (9) and the resonant circuit (10) are connected in parallel as a load (13) connected to an output end of the power supply circuit (8); characterized in that: The glass panel (12) is the self-induction induction cooker glass panel according to any one of claims 1 to 5; the power regulation circuit (11) is electrically connected to the power supply circuit (8), the load (13) and the glass panel (12), and is used to regulate the power of the load (13) according to the output current of each of the thermistors (2).
7. The induction cooker according to claim 6, characterized in that: The power regulation circuit (11) comprises a switch tube (1101), a PWM chip (1102), a current comparison circuit (1103) and a direct current drive power supply, wherein the direct current drive power supply is used to provide an operating voltage to the glass panel (12), the current comparison circuit (1103) is electrically connected to the glass panel (12) and the PWM chip (1102), the PWM chip (1102) is also electrically connected to the gate of the switch tube (1101), the switch tube (1101) is connected in series with the load (13), one of the drain and the source of the switch tube (1101) is connected to one end of the load (13), and the other of the drain and the source of the switch tube (1101) is connected to an output end of the power supply circuit (8); The current comparison circuit (1103) is used to compare the output currents of the thermistors (2) to generate an adjustment signal and send it to the PWM chip (1102); the PWM chip (1102) is used to output a PWM signal according to the adjustment signal to control the on and off of the switch tube (1101).
8. The induction cooker according to claim 7, characterized in that: The current comparison circuit (1103) comprises a plurality of first comparators (14), a plurality of first comparison modules (15), a second comparison module (16), a first adjustment signal output terminal and a second adjustment signal output terminal, the number of the first comparators (14) being the same as the number of the thermistors (2), each of the first comparators (14) being electrically connected to an output terminal of an output current of each of the thermistors (2) in a one-to-one correspondence, all of the first comparators (14) being electrically connected to the first adjustment signal output terminal, each of the first comparators (14) being divided into a plurality of groups and being electrically connected to each of the first comparison modules (15) respectively, all of the first comparison modules (15) being electrically connected to the second comparison module (16) and the second adjustment signal output terminal, and the second comparison module (16) being also electrically connected to the first adjustment signal output terminal and the second adjustment signal output terminal; The first comparator (14) is used to compare the input output current with a preset current upper limit value, and output a first adjustment signal to the first adjustment signal output terminal when the input output current is greater than or equal to the current upper limit value, and output the input output current as a first current to the corresponding first comparison module (15) when the input output current is less than the current upper limit value; the first adjustment signal is used to enable the PWM chip (1102) to control the switch tube (1101) to reduce the power of the load (13); The first comparison module (15) is used to extract the maximum current and the minimum current from the first input current as the second current output to the second comparison module (16), and output a second adjustment signal to the second adjustment signal output terminal when the maximum deviation between the first input currents is greater than or equal to a preset deviation upper limit value; the second adjustment signal is used to enable the PWM chip (1102) to control the switch tube (1101) to reduce the power of the load (13); The second comparison module (16) is used to output the first adjustment signal to the first adjustment signal output terminal when the maximum current among the second input currents is greater than or equal to the current upper limit value, and to output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation between the second input currents is greater than or equal to the deviation upper limit value.
9. The induction cooker according to claim 8, characterized in that: The first comparison module (15) comprises a second comparator (1501) and a third comparator (1502); the second comparator (1501) comprises a plurality of input terminals and at least three output terminals, wherein each input terminal is electrically connected to a corresponding first comparator (14), the first output terminal and the second output terminal are both electrically connected to the second comparison module (16), the third output terminal is electrically connected to the input terminal of the third comparator (1502), and the output terminal of the third comparator (1502) is electrically connected to the second adjustment signal output terminal; The second comparator (1501) is used to extract the maximum current and the minimum current from the first input current and output them from its first output terminal and second output terminal respectively, and to calculate the maximum deviation between the first input currents and output them from its third output terminal; the third comparator (1502) is used to compare the maximum deviation output by the second comparator (1501) with the upper limit of the deviation, and output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation output by the second comparator (1501) is greater than or equal to the upper limit of the deviation.
10. The induction cooker according to claim 8, characterized in that: The second comparison module (16) comprises a fourth comparator (1601), a fifth comparator (1602) and a sixth comparator (1603), the fourth comparator (1601) having a plurality of input terminals and at least two output terminals, wherein each input terminal is electrically connected to each first comparison module (15), a first output terminal is electrically connected to the first adjustment signal output terminal through the fifth comparator (1602), and a second output terminal is electrically connected to the second adjustment signal output terminal through the sixth comparator (1603); The fourth comparator (1601) is used to extract the maximum current from the second input current and output it from its first output terminal, and to calculate the maximum deviation between the second input currents and output it from its second output terminal; the fifth comparator (1602) is used to compare the maximum current output by the fourth comparator (1601) with the current upper limit value, and output the first adjustment signal to the first adjustment signal output terminal when the maximum current output by the fourth comparator (1601) is greater than or equal to the current upper limit value; the sixth comparator (1603) is used to compare the maximum deviation output by the fourth comparator (1601) with the deviation upper limit value, and output the second adjustment signal to the second adjustment signal output terminal when the maximum deviation output by the fourth comparator (1601) is greater than or equal to the deviation upper limit value.