A cooking appliance and its control method

Abstract

The present invention discloses a cooking appliance and a control method thereof. The cooking appliance includes: a temperature-detecting pot, which comprises a pot body and a pot handle. The pot body is provided with a temperature detection group, and the pot handle is provided with a receiving coil and an electronic control board. The electronic control board is electrically connected to the temperature detection group and the receiving coil respectively; a gas stove, which comprises a panel, a burner and a wireless power transmission MCU. The panel is provided with a transmitting coil group located outside the burner, and the transmitting coil group is connected to the wireless power transmission MCU; the wireless power transmission MCU is communicatively connected to the temperature-detecting pot. The cooking appliance of the present invention can not only accurately detect the temperature of the pot body, quickly identify the sticking area, but also wirelessly transmit power to the temperature-detecting pot through the gas stove, so that the temperature-detecting pot does not need battery power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular, to a cooking appliance and a control method thereof. Background Art

[0002] At present, most of the cooktops with temperature detection functions on the market use the anti-dry burning probe scheme. In this scheme, a high-temperature resistant NTC probe is arranged in the middle of the burner. The NTC probe is in close contact with the bottom of the pot, can measure the temperature of the bottom of the pot, and can infer the actual temperature inside the pot according to the temperature of the bottom of the pot. However, this scheme has the following disadvantages:

[0003] 1. When using an NTC temperature probe, the maximum temperature resistance is generally only 300 degrees, while the flame temperature can exceed 1000 degrees. When designing the structure, it is necessary to avoid the high-temperature area for the temperature probe.

[0004] 2. The anti-dry burning temperature probe is located in the center of the cooktop burner. The high temperature during high-fire stir-frying will damage the temperature probe. Therefore, most of the cooktops with anti-dry burning temperature do not support stir-frying.

[0005] 3. The bottom thickness of each pot is inconsistent. During actual use, the temperature difference between the bottom of the pot and the temperature inside the pot is very large. It is difficult to accurately infer the temperature inside the pot by measuring the temperature of the bottom of the pot.

[0006] 4. The temperature probe needs to be in close contact with the bottom of the pot to accurately measure the temperature. If the user places the pot unevenly, or there is dirt on the bottom of the pot, it will affect the temperature measurement, making the gap between the actual temperature and the measured temperature more serious.

[0007] 5. The anti-dry burning temperature probe is a precision sensor. If it is impacted by an external force, it is easy to be damaged. During use, the bottom of the pot is very likely to impact the top of the sensor, and if there is wind during use, the flame will also burn to the sensor, both of which will cause the sensor to fail.

[0008] 6. To solve the power saving problem when the pot is not in use, it is necessary to add a power-on button. When the user uses it, they need to press this button to turn on the power first, and then press this button again to turn off the power after use. Otherwise, the power will be quickly exhausted, the operation is not convenient, and there will be a situation where the power-on button is forgotten to be turned off. Summary of the Invention

[0009] The present invention aims to solve at least one of the problems existing in the related prior art to some extent. For this purpose, the present invention provides a cooking appliance, which can not only accurately detect the temperature of the pot body, quickly identify the sticking area, but also wirelessly transmit power to the temperature detection pot through the gas stove, so that the temperature detection pot does not need battery power supply.

[0010] According to the control method of a cooking appliance provided above, it is realized through the following technical solutions:

[0011] A cooking appliance, comprising: a temperature-detecting pot, including a pot body and a pot handle, wherein the pot body is provided with a temperature-detecting group, and the pot handle is provided with a receiving coil and an electronic control board, and the electronic control board is electrically connected to the temperature-detecting group and the receiving coil respectively; a gas stove, including a panel, a burner and a wireless power transmission MCU, wherein the panel is provided with a transmitting coil group located around the burner, and the transmitting coil group is connected to the wireless power transmission MCU; the wireless power transmission MCU is communicatively connected to the temperature-detecting pot, and the wireless power transmission MCU is configured to obtain the current working state of the temperature-detecting pot, the current working state including the receiving power of the receiving coil, and determine the precise position of the receiving coil according to the receiving power, and is further configured to determine whether to control the wireless power transmission MCU to wirelessly transmit power to the temperature-detecting pot according to the current combustion state of the burner and the precise position of the receiving coil.

[0012] In some embodiments, the transmitting coil group includes a plurality of first transmitting coil groups arranged side by side at equal intervals, and each first transmitting coil group includes a plurality of transmitting coils arranged in a row or an arc array; the wireless power transmission MCU is connected to any one of the transmitting coils through a wireless power transmission control circuit.

[0013] In some embodiments, a second transmitting coil group is provided between adjacent first transmitting coil groups, the second transmitting coil group partially overlaps with adjacent two first transmitting coil groups respectively, and the second transmitting coil group includes a plurality of transmitting coils arranged in a row or an arc array.

[0014] In some embodiments, the wireless power transmission control circuit includes a DC power input terminal and a power semiconductor switch group, the power semiconductor switch group is connected to both ends of the transmitting coil, and the power semiconductor switch group is connected to the DC power input terminal.

[0015] In some embodiments, the gas stove further includes a combustion control system, and the combustion control system is electrically connected to the burner and the wireless power transmission MCU respectively.

[0016] In some embodiments, a transmitting power detection module is connected between the wireless power transmission MCU and the transmitting coil group, and the transmitting power detection module is configured to detect the transmitting power of the transmitting coil group in real time; the electronic control board includes a receiving power detection module and a main control MCU, the receiving power detection module is configured to detect the receiving power of the receiving coil in real time, and the main control MCU is electrically connected to the receiving power detection module, the temperature-detecting group and the receiving coil respectively.

[0017] In some embodiments, the transmission power detection module includes a voltage detection circuit and a current detection circuit. The voltage detection circuit is connected between the transmission coil group and the voltage detection port a3 of the wireless power transmission MCU, and the current detection circuit is connected between the transmission coil group and the current detection port a4 of the wireless power transmission MCU. The reception power detection module includes a voltage detection circuit and a current detection circuit. The voltage detection circuit is connected between the reception coil and the voltage detection port a1 of the main control MCU, and the current detection circuit is connected between the reception coil and the current detection port a2 of the main control MCU.

[0018] In some embodiments, the electronic control board further includes a supercapacitor and a power management module. The supercapacitor is respectively connected to the reception power detection module and the main control MCU, and the power management module is respectively connected to the supercapacitor and the main control MCU.

[0019] In some embodiments, the temperature detection group includes a plurality of thermocouple temperature probes, and all the thermocouple temperature probes are arranged at intervals at the bottom of the pot body. An NTC temperature sensor is provided on the electronic control board or the pot handle, and the NTC temperature sensor is electrically connected to the main control MCU of the electronic control board.

[0020] In some embodiments, a temperature display area and / or a position indicator light are further provided on the pot handle. The temperature display area is electrically connected to the main control MCU of the electronic control board and is used to display different colors or different brightnesses according to the temperature of the pot body detected by the temperature detection group. The position indicator light is electrically connected to the main control MCU of the electronic control board and is used to indicate whether the pot handle is above the transmission coil group.

[0021] According to the control method of a cooking appliance provided above, it is realized through the following technical solutions: A control method of a cooking appliance, which is applied to the cooking appliance as described above. The control method includes:

[0022] S1. Obtain the current combustion state of the burner, and the current combustion state includes a normal combustion state.

[0023] S2. Judge whether the current combustion state is a normal combustion state. If so, enter the stage of searching for the position of the reception coil; if not, continue to execute step S2.

[0024] S3. Control each transmission coil in the transmission coil group to work in sequence according to the search power, and at the same time obtain the reception power of the reception coil.

[0025] S4. Judge whether the temperature detection pot or the gas stove receives the reception power of the reception coil after the transmission coil group finishes working. If so, enter the next step; if not, it is determined that the reception coil is not above the transmission coil group.

[0026] S5. Determine the precise positions of the target transmitting coil and the receiving coil based on all the received power.

[0027] S6. Enter the wireless power transmission stage. Control the wireless power transmission MCU to wirelessly transmit power to the temperature detection pot through the target transmitting coil, and the temperature detection pot feeds back its current working state to the gas stove.

[0028] In some embodiments, the steps of controlling each transmitting coil in the transmitting coil group to sequentially operate at the search power specifically include:

[0029] S311. According to the global search order, control the first transmitting coil in the transmitting coil group to operate at the search power.

[0030] S312. Obtain the transmission signal when the first reflection coil operates at the search power.

[0031] S313. Calculate the actual transmission power based on the transmission signal.

[0032] S314. Determine whether the actual transmission power is within the set range. If not, adjust the search power and return to step S311. If so, control the next transmitting coil in the transmitting coil group to operate at the search power.

[0033] In some embodiments, the steps of determining the precise positions of the target transmitting coil and the receiving coil based on all the received power specifically include:

[0034] S51. Extract the maximum value of all the received power.

[0035] S52. Determine whether the maximum value is less than the minimum power threshold.

[0036] S53. If the maximum value is greater than or equal to the minimum power threshold, determine the transmitting coil corresponding to the maximum value as the target transmitting coil, and determine that the receiving coil is directly above the target transmitting coil.

[0037] S54. If the maximum value is less than the minimum power threshold, determine that the receiving coil is not above the transmitting coil group.

[0038] In some embodiments, the steps of controlling the wireless power transmission MCU to wirelessly transmit power to the temperature detection pot through the target transmitting coil specifically include:

[0039] S61. The wireless power transmission MCU controls the target transmitting coil to operate at the transmission power, and the transmission power is greater than the search power.

[0040] S62. The receiving coil receives the changing magnetic field and converts it into an electric field to start charging the temperature detection pot.

[0041] In some embodiments, after step S6, the control method further includes:

[0042] S7, real-time detecting the real-time received power of the receiving coil during wireless power transmission;

[0043] S8, judging whether the real-time received power is less than the minimum power threshold. If so, proceed to the next step; if not, return to step S7;

[0044] S9, increasing the transmission power, and judging whether the increased transmission power reaches the maximum power threshold. If so, enter the re-search stage; if not, control the target transmitting coil to work at the increased transmission power and return to step S7.

[0045] In some embodiments, the step of entering the re-search stage specifically includes:

[0046] S91, entering the re-search stage;

[0047] S92, with the target transmitting coil as the center, controlling the transmitting coils adjacent to the target transmitting coil to work at the search power in sequence, and simultaneously obtaining the received power of the receiving coil;

[0048] S93, obtaining the maximum value of all the received powers, and determining the transmitting coil corresponding to the maximum value as the new target transmitting coil;

[0049] S94, judging whether the maximum value is less than the minimum power threshold. If not, end the re-search stage and return to step S6; if so, proceed to the next step;

[0050] S95, with the new target transmitting coil as the center, controlling the transmitting coils adjacent to the new target transmitting coil to work at the search power in sequence, and simultaneously obtaining the received power of the receiving coil, then return to step S93.

[0051] Compared with the prior art, the present invention has at least the following beneficial effects:

[0052] 1. For the cooking appliance of the present invention, by arranging a temperature detection group on the pot body, multi-point detection of the pot body temperature is realized, significantly improving the detection accuracy of the temperature inside the pot body. At the same time, according to the multi-point detection of the pot body temperature, it can quickly identify whether the pot body temperature is uniform and whether there is a sticking area on the pot body;

[0053] 2. By communicatively connecting the temperature-detecting pot with the wireless power transmission MCU of the gas stove, setting a receiving coil on the pot handle, and arranging a transmitting coil group on the panel of the gas stove around the burner, it is possible to determine the precise position of the receiving coil and the target transmitting coil according to the received power of the receiving coil. Moreover, after the burner is in the normal combustion state and the precise position of the receiving coil is identified, the gas stove can control the wireless power transmission MCU to wirelessly transmit power to the temperature-detecting pot, ensuring that the temperature-detecting pot does not require battery power supply or any buttons. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a schematic structural diagram of the cooking device in Embodiment 1 of the present invention;

[0055] Figure 2 is a connection block diagram of the temperature-detecting pot in Embodiment 1 of the present invention;

[0056] Figure 3 is a circuit diagram of the received power detection module in Embodiment 1 of the present invention;

[0057] Figure 4 is a schematic structural diagram of the transmitting coil group in Embodiment 1 of the present invention Figure 1 ;

[0058] Figure 5 is a schematic structural diagram of the transmitting coil group in Embodiment 1 of the present invention Figure 2 ;

[0059] Figure 6 is another schematic structural diagram of the gas stove in Embodiment 1 of the present invention;

[0060] Figure 7 is a connection block diagram of the gas stove in Embodiment 1 of the present invention;

[0061] Figure 8 is a schematic structural diagram of the transmitted power detection module in Embodiment 1 of the present invention;

[0062] Figure 9 is a circuit diagram of the wireless power transmission emission control circuit in Embodiment 1 of the present invention;

[0063] Figure 10 is a flowchart of the control method of the cooking device in Embodiment 2 of the present invention;

[0064] Figure 11 is a flowchart of the control method of the cooking device in Embodiment 3 of the present invention.

[0065] In the figure: 1 - Temperature - detecting pot, 11 - Pot body, 12 - Pot handle, 13 - Temperature - detecting group, 131 - Thermocouple temperature probe, 14 - Wireless communication module, 15 - Receiving coil, 16 - Electric control board, 161 - Received - power detection module, 162 - Supercapacitor, 163 - Main - control MCU, 164 - NTC temperature sensor, 165 - Power - management module, 17 - Temperature - display lamp, 171 - Temperature - display area, 18 - Position - prompt lamp;

[0066] 2 - Gas stove, 20 - Panel, 21 - Transmitting - coil group, 210 - Transmitting coil, 211 - First transmitting - coil group, 212 - Second transmitting - coil group, 22 - Burner, 23 - Wireless - power - transmission MCU, 24 - Combustion - control system, 25 - Transmitted - power detection module, 26 - Wireless - power - transmission emission - control circuit, 261 - DC - power input terminal, 262 - Power - semiconductor switch group, 27 - Battery power supply. Specific embodiments

[0067] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific embodiments of the present invention or making equivalent replacements for some technical features without departing from the spirit of the present - invention solution shall all be covered within the scope of the technical - solution scope claimed by the present invention.

[0068] Embodiment 1

[0069] Referring to Figure 1 , this embodiment provides a cooking appliance, including a temperature - detecting pot 1 and a gas stove 2. The temperature - detecting pot 1 includes a pot body 11 and a pot handle 12. The pot handle 12 is provided with a receiving coil 15 and an electric control board 16. The electric control board 16 is electrically connected to the temperature - detecting group 13 and the receiving coil 15 respectively. The pot body 11 is provided with a temperature - detecting group 13 for real - time detection of the temperature of the pot body 11. In this embodiment, the temperature - detecting group 13 includes a plurality of thermocouple temperature probes 131. All the thermocouple temperature probes 131 are spaced apart and arranged at the bottom of the pot body 11 to achieve multi - point detection of the pot - body temperature through different thermocouple temperature probes 131. In this way, it helps to improve the detection accuracy of the pot - body temperature, and at the same time, it can quickly identify whether the pot - body temperature is uniform and whether there is a sticking area on the pot body 11 according to the multi - point detection of the pot - body temperature.

[0070] The gas stove 2 includes a panel 20, a burner 22, and a wireless power transmission MCU 23. The panel 20 is provided with a transmitting coil group 21 located outside the burner 22. The transmitting coil group 21 includes a plurality of transmitting coils 210. The wireless power transmission MCU 23 is connected to the transmitting coil group 21. The wireless power transmission MCU 23 is communicatively connected to the temperature-detecting pot 1. The gas stove 2 can obtain the current working state of the temperature-detecting pot 1 through the wireless power transmission MCU 23. The current working state includes the received power of the receiving coil 15, and based on the received power, the accurate position of the receiving coil 15 can be determined, and the target transmitting coil can also be determined according to the received power. The wireless power transmission MCU 23 is also used to determine whether to control the wireless power transmission MCU 23 to wirelessly transmit power to the temperature-detecting pot 1 according to the current combustion state of the burner 22 and the accurate position of the receiving coil 15.

[0071] Reference Figure 1-2 , the temperature detection group 13 includes at least four thermocouple temperature probes 131. In this embodiment, the number of thermocouple temperature probes 131 is five. The first thermocouple temperature probe 131 is arranged at the central position of the bottom of the pot body 11 for detecting the central temperature of the pot body 11. The remaining four thermocouple temperature probes 131 are circumferentially and evenly distributed at the bottom of the pot body 11 and are located outside the first thermocouple temperature probe 131, respectively for detecting the temperatures at the upper left, upper right, lower right, and lower left positions of the pot body 11. Thus, through the cooperation of the five thermocouple temperature probes 131, the pot body temperatures at five points of the pot body 1 are detected, the temperature detection range is increased, which is beneficial to improving the detection accuracy of the internal temperature of the pot body. At the same time, it is possible to quickly identify whether the pot body temperatures in the above five regions are uniform and whether there is food sticking to the pot in the above five regions according to the detected multi-point pot body temperatures, improving the user experience. In other embodiments, the five thermocouple temperature probes 131 can be circumferentially and evenly distributed at the bottom of the pot body 11.

[0072] In order to increase the detection accuracy of each thermocouple temperature probe 131, an NTC temperature sensor 164 for detecting the ambient temperature is provided on the electronic control board 16 or the pot handle 12. The main control MCU 163 on the electronic control board 16 is electrically connected to the NTC temperature sensor 164, and the main control MCU 163 is used to regard the detected ambient temperature as the cold-end compensation when each thermocouple temperature probe 131 detects.

[0073] Reference Figure 1, a wireless communication module 14 is provided on the pot handle 12. The temperature detection pot 1 is communicatively connected to the gas stove 2 through the wireless communication module 14, so that the temperature detection pot 1 can obtain the preset temperature value pre-stored in the gas stove 2 through the wireless communication module 14. Of course, the preset temperature value can also be pre-stored on the electronic control board 16. In addition, it is convenient for the temperature detection pot 1 to feedback the current working state of the temperature detection pot 1 to the gas stove 2 through the wireless communication module 14, and the gas stove 2 adjusts its working state according to the current working state.

[0074] In this embodiment, the receiving coil 15 is used to receive the transmitted power of any one of the transmitting coils 210 in the transmitting coil group 2. When the gas stove 2 wirelessly transmits power to the temperature detection pot 1, the receiving coil 15 is also used to receive the changing magnetic field transmitted by the target transmitting coil and convert the changing magnetic field into an electric field to charge the farad capacitor 162 in the electronic control board 16. In this way, it is realized that the temperature detection pot 1 is automatically charged by the gas stove 2, without the need for battery power supply or any buttons.

[0075] Reference Figure 2 , in this embodiment, the electronic control board 16 includes a received power detection module 161, a farad capacitor 162, and a main control MCU 163. The main control MCU 163 is electrically connected to the temperature detection group 13, the wireless communication module 14, the receiving coil 15, the received power detection module 161, and the farad capacitor 162 respectively. The farad capacitor 162 is connected to the receiving coil 15 through the received power detection module 161. The main control MCU can obtain the received power of the receiving coil 15 through the received power detection module 161, and is used to determine whether the temperature detection pot 1 is located above the transmitting coil group 21 of the gas stove 2 according to whether the received power is received. Of course, it is also used to determine the accurate position of the receiving coil 15 according to the strength of all the received power, that is, to accurately identify which transmitting coil 210 of the gas stove 2 the receiving coil 15 is located above. At this time, the transmitting coil 210 corresponding to the strongest received power is the target transmitting coil. When the accurate position of the receiving coil 15 and the target transmitting coil are determined, in the normal combustion state of the gas stove 2, the wireless power transmission MCU controls the target transmitting coil to work and starts wireless power transmission to charge the farad capacitor 162, so that the farad capacitor 162 can supply power to the temperature detection pot 1.

[0076] Reference Figure 3, the received power detection module 161 includes a voltage detection circuit for detecting the voltage U of the receiving coil 15 and a current detection circuit for detecting the current I of the receiving coil 15. The voltage detection circuit is connected between the receiving coil 15 and the voltage detection port a1 of the main control MCU, and the current detection circuit is connected between the receiving coil 15 and the current detection port a2 of the main control MCU. When any transmitting coil 210 in the transmitting coil group 2 operates or transmits a signal, if the receiving coil 15 can receive the signal, the main control MCU can calculate the received power actually received by the receiving coil 15 according to the formula P = U×I.

[0077] The voltage detection circuit includes a voltage transformer T1, a diode group, and an operational amplifier. The input end of the voltage transformer T1 is connected to both ends of the receiving coil 15. The output end of the voltage transformer T1 is grounded and connected to the third end of the operational amplifier through the diode group respectively. The second end of the operational amplifier is grounded, and the first end of the operational amplifier is connected to the voltage detection port a1 of the main control MCU. In this embodiment, the diode group is composed of four diodes. The four diodes are connected in sequence to form a loop. The third and fourth diodes are grounded respectively. The output end of the voltage transformer T1 is connected between the first and fourth diodes and between the second and third diodes respectively. In this way, the output end of the voltage transformer T1 is connected to GND through the third and fourth diodes respectively, and the output end of the voltage transformer T1 is connected to the third end of the operational amplifier through the first and second diodes respectively.

[0078] The voltage detection circuit further includes a first resistor R1, a second resistor R2, and a capacitor C1. The second end of the operational amplifier is grounded through the first resistor R1. The second resistor R2 and the capacitor C1 are connected in parallel between the second end and the first end of the operational amplifier. The current detection circuit includes a sampling resistor R3, a third resistor R4, and a capacitor C2. The receiving coil 15 is grounded through the sampling resistor R3. The sampling resistor R3 and the receiving coil 15 are connected to the current detection port a2 of the main control MCU through the third resistor R4 respectively. The capacitor C2 is connected in parallel with the sampling resistor R3, and one end of the capacitor C2 is grounded and the other end is connected between the third resistor R4 and the current detection port a2 of the main control MCU.

[0079] Reference Figure 2, the electronic control board 16 further includes a supercapacitor 162 and a power management module 165. The supercapacitor 162 is respectively connected to the received power detection module 161 and the main control MCU. The power management module 165 is respectively connected to the supercapacitor 162 and the main control MCU, and is used for detecting the voltage of the supercapacitor 162 in real time, and calculating the remaining power stored in the supercapacitor 162 based on this. The power management module 165 is also used for detecting the working current of the temperature detection pot 1 in real time, calculating the power consumption of the temperature detection pot 1 per unit time, calculating the remaining power supply time that the remaining power stored in the supercapacitor 162 can maintain the operation of the temperature detection pot 1 based on this, and sending these data to the main control MCU.

[0080] Reference Figure 1 , a temperature display area 17 and / or a position indicator light 18 are further provided on the pot handle 12. The temperature display area 17 is located between the pot body 11 and the receiving coil 15, or between the receiving coil 15 and the electronic control board 16. The temperature display area 17 is electrically connected to the main control MCU on the electronic control board 16, and is used for displaying different colors or different brightness according to the pot body temperature detected by the temperature detection group 13. The position indicator light 18 is electrically connected to the main control MCU of the electronic control board 16, and is used for indicating whether the pot handle 12 is above the transmitting coil group. In this way, through the position indicator light 18, the relative position between the pot handle 12 and the transmitting coil group 2 can be sensed in time, which is convenient for the user to adjust the pot handle 12 above the transmitting coil group 2 in time and quickly, so as to reduce the probability of not being able to search for the accurate position of the receiving coil 15, which is beneficial to reducing the working frequency of the gas stove 2 and reducing energy consumption.

[0081] Specifically, the temperature display area 17 includes a plurality of sub-display areas 171 equal in number to the thermocouple temperature probes 131. Each sub-display area 171 is arranged corresponding to one of the thermocouple temperature probes 131. A monochromatic lamp bead is provided in each sub-display area 171 for making each sub-display area 171 display different brightness. Or three lamp beads with different display colors are provided in each sub-display area 171, and through the three lamp beads with different colors, each sub-display area 171 is used for displaying different colors.

[0082] In this embodiment, the sub-display areas 171 are correspondingly five. One of the sub-display areas 171 is a circular display area, which is located at the central position of the temperature display area 17 and corresponds to the thermocouple temperature probe 131 at the central position of the bottom of the pot body 11. The remaining four sub-display areas 171 are respectively arc-shaped display areas located outside the circular display area. All the arcs are circumferentially spaced evenly and jointly enclose a ring. These four sub-display areas 171 are respectively arranged in one-to-one correspondence with the thermocouple temperature probes 131 at the upper left, upper right, lower right, and lower left positions of the pot body 11, that is, the upper left sub-display area 171 corresponds to the upper left thermocouple temperature probe 131, and so on.

[0083] Taking the example that three lamp beads with different display colors are provided in each sub-display area 171. Each lamp bead can use the PWM pulse width modulation technology to adjust the brightness, and thus can display different colors. Each thermocouple temperature probe 131 detects the temperature of the cookware in the corresponding area in real time, and the main control MCM controls the corresponding sub-display area 171 to display different colors according to the relationship between the temperature of the cookware detected by each thermocouple temperature probe 131 in real time and the preset temperature value. During use, if the temperature of the cookware in any area is relatively high, the proportion of red light increases; if the temperature of the cookware is moderate, the proportion of yellow increases; if the temperature of the cookware is relatively low, the proportion of blue increases.

[0084] In this embodiment, the transmitting coil group 21 can be rectangular, arc-shaped or circular-ring-shaped. Specifically, the arrangement mode of the transmitting coil group 21 includes but is not limited to any one of the following:

[0085] First, referring to Figure 1 and Figure 4 , the transmitting coil group 21 is rectangular, and it is arranged on the front side of the burner 22, that is, between the burner 22 and the user. The transmitting coil group 21 includes a plurality of first transmitting coil groups 211 arranged side by side at equal intervals. The number of the first transmitting coil groups 211 is two or more, and each first transmitting coil group 211 includes a plurality of transmitting coils 210 arranged in a row. In Figure 1 and Figure 4 , the transmitting coil group 21 includes three first transmitting coil groups 211 arranged at equal intervals in the front-back direction, that is, three rows of first transmitting coil groups 211. Each first transmitting coil group 211 includes ten transmitting coils 210 arranged at equal intervals in the left-right direction and arranged in a row. At this time, the numbers are A1 - A10, B1 - B10, and C1 - C10 respectively.

[0086] Second, referring to Figure 6 , when the transmitting coil group 21 is arc-shaped, it is arranged on the front side of the burner 22, that is, between the burner 22 and the user. To ensure that the transmitting coil group 21 has a large total transmitting area, the arc length of the transmitting coil group 21 is greater than 1 / 4 of the circumference when the transmitting coil group 21 is circular-ring-shaped. Preferably, the arc length of the transmitting coil group 21 is in the range of 1 / 4 to 1 / 2 of the circumference. The transmitting coil group 21 includes a plurality of transmitting coils 210 in an arc array.

[0087] Third, referring to Figure 5, The difference from the first type is that the transmitting coil group 21 further includes a second transmitting coil group 212. A second transmitting coil group 212 is provided between adjacent first transmitting coil groups 211. Each second transmitting coil group 212 partially overlaps with two adjacent first transmitting coil groups 211. In this way, the area where the transmitting and receiving coils are offset is smaller, and the facing area is larger, resulting in higher power transmission efficiency. The second transmitting coil group 212 includes a plurality of transmitting coils 210 arranged in a row, and the transmitting coils 210 on the second transmitting coil group 212 and the transmitting coils 210 on the first transmitting coil group 211 are arranged staggeredly. In Figure 5 , each second transmitting coil group 212 includes nine transmitting coils 210 that are evenly spaced along the left-right direction and arranged in a row. Each transmitting coil 210 of the second transmitting coil group 212 partially overlaps with four adjacent transmitting coils 210 located on the first transmitting coil group 211. At this time, the numbers are A1 - A10, B1 - B9, C1 - C10, D1 - D9, E1 - E10 respectively.

[0088] The fourth type, the difference from the second type is that the transmitting coil group 21 further includes a second transmitting coil group 212. A second transmitting coil group 212 is provided between adjacent first transmitting coil groups 211. Each second transmitting coil group 212 partially overlaps with two adjacent first transmitting coil groups 211. The second transmitting coil group 212 includes a plurality of transmitting coils 210 in an arc array, and each transmitting coil 210 of the second transmitting coil group 212 partially overlaps with four adjacent transmitting coils 210 located on the first transmitting coil group 211.

[0089] Reference Figure 7 , the gas stove 2 further includes a combustion control system 24. The combustion control system 24 is electrically connected to the burner 22 and the wireless power transmission MCU respectively. Through the combustion control system 24, the gas stove 2 can obtain the current combustion state of the burner 22. The current combustion state includes normal combustion state, flameout state, current combustion firepower level, preset temperature value at the current time point, whether there is a fault, etc. In addition, the combustion control system 22 can receive the control signal from the wireless power transmission MCU for changing the current combustion firepower level, automatic shutdown, etc.

[0090] In this embodiment, the gas stove 2 further includes a transmission power detection module 25. A transmission power detection module 25 is connected between the wireless power transmission MCU 23 and the transmitting coil group 21. The transmission power detection module 25 is used to detect the transmission power of the transmitting coil group 21 in real time.

[0091] Reference Figure 8 , the transmission power detection module 25 includes a voltage detection circuit for detecting the voltage U f of the transmitting coil group 21 and a current detection circuit for detecting the current If The current detection circuit, the voltage detection circuit is connected between the transmitting coil group 21 and the voltage detection port a3 of the wireless power transmission MCU, and the current detection circuit is connected between the transmitting coil group 21 and the current detection port a4 of the wireless power transmission MCU. The wireless power transmission MCU calculates the actual transmission power of the transmitting coil group 21 according to the formula P f =U f I f Then the actual transmission power of the transmitting coil group 21 can be calculated.

[0092] The voltage detection circuit includes a voltage transformer T1, a diode group and an operational amplifier. The input end of the voltage transformer T1 is connected to both ends of the transmitting coil group 21. The output end of the voltage transformer T1 is grounded and connected to the third end of the operational amplifier through the diode group respectively. The second end of the operational amplifier is grounded, and the first end of the operational amplifier is connected to the voltage detection port a3 of the wireless power transmission MCU. In this embodiment, the diode group is composed of four diodes. The four diodes are connected in sequence to form a loop. The third and fourth diodes are grounded respectively. The output end of the voltage transformer T1 is connected between the first and fourth diodes and between the second and third diodes respectively. In this way, the output end of the voltage transformer T1 is connected to GND through the third and fourth diodes respectively, and the output end of the voltage transformer T1 is connected to the third end of the operational amplifier through the first and second diodes respectively.

[0093] The voltage detection circuit further includes a first resistor R1, a second resistor R2 and a capacitor C1. The second end of the operational amplifier is grounded through the first resistor R1. The second resistor R2 and the capacitor C1 are connected in parallel between the second end and the first end of the operational amplifier. The current detection circuit includes a sampling resistor R3, a third resistor R4 and a capacitor C2. The transmitting coil group 21 is grounded through the sampling resistor R3. The sampling resistor R3 and the transmitting coil group 21 are connected to the current detection port a4 of the wireless power transmission MCU through the third resistor R4 respectively. The capacitor C2 is connected in parallel with the sampling resistor R3, and one end of the capacitor C2 is grounded and the other end is connected between the third resistor R4 and the current detection port a4 of the wireless power transmission MCU.

[0094] Reference Figure 7 Figure 7 , the gas stove 2 further includes a wireless power transmission emission control circuit 26. The transmitting coil group 21 is controlled by the wireless power transmission emission control circuit 26 and receives the control signal of the wireless power transmission MCU. In this embodiment, the transmitting coil group 21 is composed of a plurality of transmitting coils 210. The wireless power transmission MCU is connected to any one of the transmitting coils 210 through the wireless power transmission emission control circuit 26. In this way, through the wireless power transmission emission control circuit 26, the wireless power transmission MCU can be connected to any one of the transmitting coils 210 of the transmitting coil group 2.

[0095] Reference Figure 9, the wireless power transmission emission control circuit 26 includes a DC power input terminal 261 and a power semiconductor switch group 262. The power semiconductor switch group 262 is connected across the two ends of the transmitting coil 210. The power semiconductor switch group 262 is connected to the DC power input terminal 261, and the power semiconductor switch group 262 is connected to the wireless power transmission MCU. The power semiconductor switch group 262 includes four power semiconductor switches, and the power semiconductor switch includes but is not limited to triodes, MOS transistors, thyristors, etc.

[0096] In this embodiment, the power semiconductor switch is taken as an MOS transistor as an example. In Figure 9 , the four MOS transistors are sequentially connected to form a loop. CN1 of the DC power input terminal 261 is respectively connected to the D poles of the first MOS transistor and the second MOS transistor, and CN2 of the DC power input terminal 261 is respectively connected to the S poles of the third MOS transistor and the fourth MOS transistor. One end of the transmitting coil 210 is connected between the S pole of the first MOS transistor and the D pole of the third MOS transistor through a capacitor C3, and the other end of the transmitting coil 210 is directly connected between the S pole of the second MOS transistor and the D pole of the fourth MOS transistor. Thus, by changing the input voltage of the DC power input terminal 261, the voltage of the emission waveform can be changed. When the first and fourth MOS transistors are turned on, the voltage on the transmitting coil is positive; when the second and third MOS transistors are turned on, the voltage on the transmitting coil is negative. By changing the on-off frequency of the four MOS transistors, the frequency of the emission waveform can be changed, and the capacitor C3 can convert the rectangular wave into a sine wave.

[0097] Refer to Figure 7 , the gas stove 2 further includes a battery power supply 27. The battery power supply 27 is electrically connected to the combustion control system 24 for supplying power to the entire gas stove 2. In addition, wireless power can also be transmitted to the temperature detection pot 2 through the wireless power transmission MCU.

[0098] It should be particularly noted that, refer to Figure 1 , when the gas stove 2 is provided with two burners 22, transmitting coil groups 21 are respectively arranged around the two burners 22, so that when the temperature detection pot 1 is placed on any one of the burners 22, the current working state of the temperature detection pot 1 can be obtained, and wireless power can be transmitted to the temperature detection pot 1 through the gas stove 2. Of course, the number of the temperature detection pots 1 can also be two. When the two temperature detection pots 1 are respectively placed on the two burners 22, it is necessary to determine which burner 22 each pot is located above. To achieve this purpose, when two temperature detection pots 1 work simultaneously, in the stage of searching for the position of the receiving coil, the left and right two groups of transmitting coil groups 21 work at intervals to identify which pot is on each burner 22, and when the pots are swapped left and right, this method can also be used for identification.

[0099] In addition, the temperature-detecting pot 1 can also be directly linked with the range hood, or the temperature-detecting pot 1 is linked with the range hood through the gas stove 2, so that the range hood can obtain the current solid temperature of the temperature-detecting pot 1 and adjust the rotation speed of the range hood accordingly, further reducing the manual intervention during the cooking process.

[0100] Embodiment 2

[0101] Reference Figure 10 , this embodiment provides a control method for a cooking appliance, which is applied to the cooking appliance as described in Embodiment 1. The control method includes:

[0102] S1. Obtain the current combustion state of the burner 22, where the current combustion state includes the normal combustion state;

[0103] Specifically, the current combustion state includes the normal combustion state, and also includes the flameout state and the current combustion fire power level, etc. When the user rotates the knob on the gas stove 2, the ignition signal of the burner 22 is triggered, and the combustion control system 24 controls the burner 22 to start ignition, and then obtains the current combustion state of the burner 22. If the ignition of the burner 22 is successful, the obtained current combustion state includes the normal combustion state and the current combustion fire power level; if the ignition of the burner 22 is not successful, the obtained current combustion state is the flameout state.

[0104] S2. Judge whether the current combustion state is the normal combustion state. If so, enter the stage of searching for the position of the receiving coil; if not, continue to execute step S2;

[0105] Specifically, if it is judged that the current combustion state is the normal combustion state, the combustion control system 24 feeds back the current combustion state to the wireless power transmission MCU. After receiving that the burner 22 is in the normal combustion state, the wireless power transmission MCU first performs the initialization operation without power transmission, and then enters the stage of searching for the position of the receiving coil, that is, it is necessary to first detect whether the temperature-detecting pot 1 is located above the burner 22 in the combustion state. If it is located above the burner 22 in the combustion state, it is necessary to find the accurate position of the receiving coil 15 of the temperature-detecting pot 1.

[0106] S3. Control each transmitting coil 210 in the transmitting coil group 21 to work in turn according to the search power, and simultaneously obtain the received power of the receiving coil 15;

[0107] Specifically, after entering the stage of searching for the position of the receiving coil, it is necessary to control the transmitting coil group 21 located outside the burner 22 in the combustion state to work to globally search whether the receiving coil 15 is located above the transmitting coil group 21. Therefore, it is necessary to follow the global search order, that is, in the order of A1 - B1 - C1 - A2 - B2 - C2... A10 - B10 - C10, reference Figure 4, control each transmitting coil 210 in the transmitting coil group 21 to work sequentially at the search power. At the same time, the temperature detection pot 1 or the gas stove 2 obtains the received power of the receiving coil 15.

[0108] During the process of searching for the position of the receiving coil, the wireless power transmission control circuit 26 sets the transmission power to the search power. In this embodiment, the search power is 25% of the total power. The wireless power transmission MCU controls the power semiconductor switch group 262, so that the wireless power transmission control circuit 26 is sequentially connected to different transmitting coils 210 of the transmitting coil group 21, that is, in the order of A1 - B1 - C1 - A2 - B2 - C2... A10 - B10 - C10, controls each transmitting coil 210 to work sequentially, and at the same time respectively obtains the received power of the receiving coil 15 when each transmitting coil 210 works sequentially. When obtaining the received power of the receiving coil 15, it can be directly obtained by the gas stove 2 or directly obtained by the temperature detection pot 1 and then fed back to the gas stove 2.

[0109] Considering the power loss and the distance between the panel and the pot handle, the distance between the transmitting coil group 21 and the receiving coil 15 is designed to be between 10 - 20 cm. At this distance, the received power of the receiving coil 15 is only 10% of the transmitting power of the transmitting coil.

[0110] During the global search process, if the temperature detection pot 1 is placed on the burner 22 in a normal combustion state and the receiving coil 15 is located above the working transmitting coil group 21, the temperature detection pot 1 or the gas stove 2 will surely be able to obtain the received power of the receiving coil 15; conversely, if the receiving coil 15 is not above the working transmitting coil group 21, or the distance between them is too large when above, at this time, the temperature detection pot 1 or the gas stove 2 cannot obtain the received power of the receiving coil 15.

[0111] S4. Determine whether the temperature detection pot 1 or the gas stove 2 receives the received power of the receiving coil 15 after the transmitting coil group 21 finishes working. If so, enter the next step; if not, it is determined that the receiving coil 15 is not above the transmitting coil group 21;

[0112] Specifically, after each transmitting coil 210 in the transmitting coil group 21 works in the global search order in turn, that is, after the transmitting coil group 21 finishes working, it is judged whether the temperature detection pot 1 or the gas stove 2 receives the received power of the receiving coil 15. If the temperature detection pot 1 or the gas stove 2 receives the received power of the receiving coil 15, it is determined that the temperature detection pot 1 is placed on the burner 22, and the receiving coil 15 is located above the transmitting coil group 21, and then it proceeds to the next step; if the temperature detection pot 1 or the gas stove 2 does not receive the received power of the receiving coil 15, it is determined that the receiving coil 15 is not above the transmitting coil group 21. At this time, there are two possibilities. The first is that the temperature detection pot 1 is moved away from the burner 22, and the second is that the temperature detection pot 1 is placed on the burner 22 but the receiving coil 15 is too far away from the transmitting coil group 21.

[0113] It can be seen that by judging whether the temperature detection pot 1 or the gas stove 2 receives the received power of the receiving coil 15 after the transmitting coil group 21 finishes working, it can be determined or identified whether the temperature detection pot 1 is located above the burner 22 in a normal combustion state.

[0114] S5. Determine the accurate positions of the target transmitting coil and the transmitting coil group 21 according to all the received powers; in this embodiment, the specific steps of determining the accurate positions of the target transmitting coil and the transmitting coil group 21 according to all the received powers include:

[0115] S51. Extract the maximum value of all the received powers;

[0116] Specifically, after the transmitting coil group 21 finishes working, all the received powers received by the temperature detection pot 1 or the gas stove 2 are sorted according to strength, and then the maximum value of all the received powers is extracted.

[0117] S52. Judge whether the maximum value is less than the minimum power threshold;

[0118] Specifically, the distance between the transmitting coil group 21 and the receiving coil 15 is between 10 - 20 cm. At this distance, the received power of the receiving coil 15 is only 10% of the transmitting power of the transmitting coil 210. Therefore, the minimum power threshold in this embodiment is set to 5% of the transmitting power.

[0119] S53. If the maximum value is greater than or equal to the minimum power threshold, determine the transmitting coil 210 corresponding to the maximum value as the target transmitting coil, and determine that the receiving coil 15 is directly above the target transmitting coil;

[0120] Specifically, assume that the position corresponding to the maximum received power is on the B5 coil. At this time, the B5 coil is the target transmitting coil. When the gas stove transmits power to the temperature detection pot 1 through the B5 coil without power transmission, the wireless power transmission effect is the highest, the charging efficiency is improved, and the loss is reduced.

[0121] S54. If the maximum value is less than the minimum power threshold, it is determined that the receiving coil 15 is not above the transmitting coil group.

[0122] Thus, by obtaining the maximum value of all received receiving powers and based on the magnitude relationship between the maximum value and the minimum power threshold, the precise position of the receiving coil 15 and the target transmitting coil can be accurately identified.

[0123] S6. Enter the wireless power transmission stage. Control the wireless power transmission MCU to wirelessly transmit power to the temperature detection pot 1 through the target transmitting coil, and the temperature detection pot 1 feeds back its current working state to the gas stove 2.

[0124] Specifically, during the wireless power transmission process, the current working state includes the pot body temperature detected by each probe, the currently received wireless power transmission receiving power, and the current power transmission state, etc., so that the gas stove 2 can adjust its working state according to the current working state. For example, when the pot body temperature remains high for a period of time, the firepower is automatically reduced, and when the pot body temperature continues to rise, the burner 22 is automatically controlled to turn off the fire. Of course, it can also support the calculation of the temperature curve for intelligent cooking. By automatically adjusting the size of the firepower, the temperature inside the pot can be changed according to the preset temperature curve to achieve more precise temperature control.

[0125] Optionally, after it is determined that the receiving coil 15 is not above the transmitting coil group, the power emission of the wireless power transmission emission control circuit 26 is turned off. After waiting for a certain period of time (such as 1 minute), re-enter step S3 for global search, or return to step S1.

[0126] Optionally, in step S3, the steps of controlling each transmitting coil 210 in the transmitting coil group 21 to work in sequence according to the search power specifically include:

[0127] S311. According to the global search order, control the first transmitting coil 210 in the transmitting coil group 21 to work at the search power.

[0128] S312. Obtain the transmission signal when the first reflection coil works at the search power.

[0129] Specifically, the transmission signal includes parameters such as voltage and current. Connect a transmission power detection module 25 to the transmitting coil group 21. The transmission power detection module 25 detects parameters such as voltage and current on the currently working transmitting coil 210 in real time and feeds them back to the wireless power transmission MCU.

[0130] S313. Calculate the actual transmission power according to the transmission signal. Specifically, the MCU calculates the actual transmission power of the currently working transmitting coil 210 according to the fed-back parameters.

[0131] S314. Determine whether the actual transmission power is within the set range. If not, adjust the search power and return to step S311. If so, control the next transmitting coil 210 in the transmitting coil group 21 to operate at the search power.

[0132] Specifically, if the deviation between the actual transmission power and the set transmission power is too large, it indicates that the actual transmission power is not within the set range. At this time, the search power needs to be adjusted to make the actual transmission of the transmitting coil close to the set transmission power. After adjusting the search power, return to step S311 and control the first transmitting coil 210 in the transmitting coil group 21 to operate at the adjusted search power. If the actual transmission of the transmitting coil is close to the set transmission power, it indicates that the actual transmission power is within the set range. At this time, the next transmitting coil 210 in the transmitting coil group 21 can be controlled to operate at the search power.

[0133] It should be specifically noted that it is only necessary to determine whether the actual transmission power when the first transmitting coil 210 operates at the search power is within the set range. If it is within the set range, the remaining transmitting coils 210 operating in the global search order will all operate at the search power; if it is not within the set range, after adjusting the search power until the actual transmission power is within the set range, control the remaining transmitting coils 210 operating in the global search order to all operate at the adjusted search power. Of course, it is also possible to repeat steps S311 - S314 when each transmitting coil 210 operates in turn.

[0134] Optionally, in step S6, the step of controlling the wireless power transmission MCU 23 to wirelessly transmit power to the temperature - detecting pot 1 through the target transmitting coil specifically includes:

[0135] S61. The wireless power transmission MCU controls the target transmitting coil to operate at the transmission power, and the transmission power is greater than the search power.

[0136] Specifically, during the wireless power transmission process, the wireless power transmission emission control circuit 26 sets the transmission power to the transmission power. In this embodiment, the transmission power is 75% of the total power. The wireless power transmission MCU controls the power semiconductor group to connect the wireless power transmission emission control circuit 26 to the target transmitting coil determined in step S5. Assuming that the B5 coil is the target transmitting coil, then connect the wireless power transmission emission control circuit 26 to the B5 coil, and the B5 coil starts power transmission. At this time, the received power received by the temperature - detecting pot 1 will be greater than the minimum power threshold.

[0137] S62. The transmitting coil group 21 receives the changing magnetic field and converts it into an electric field, and starts to charge the far - aday capacitor of the electronic control board 16 in the temperature - detecting pot 1.

[0138] Embodiment 3

[0139] Reference Figure 11, The difference between this embodiment and Embodiment 2 is that after step S6, a control method for a cooking appliance further includes the following steps:

[0140] S7, Real-time detect the real-time received power of the receiving coil 15 during wireless power transmission;

[0141] S8, Determine whether the real-time received power is less than the minimum power threshold. If so, it indicates that the user has moved the temperature detection pot 1 during use, and at this time, it is necessary to proceed to the next step. If not, it indicates that the user has not moved the temperature detection pot 1 during use, and at this time, only return to step S7 until the wireless power transmission is completed;

[0142] S9, Increase the transmission power, and determine whether the increased transmission power reaches the maximum power threshold. If so, enter the re-search phase. If not, control the target transmitting coil to work according to the increased transmission power and return to step S7. In this embodiment, the maximum power threshold is 100% of the total power.

[0143] Optionally, in step S9, the steps of entering the re-search phase specifically include:

[0144] S91, Enter the re-search phase;

[0145] S92, With the target transmitting coil as the center, control the transmitting coils 210 adjacent to the target transmitting coil to work in sequence according to the search power, and at the same time obtain the received power of the receiving coil 15;

[0146] Specifically, during the re-search process, with the target transmitting coil as the center, according to the local search order, that is, in the way of searching in sequence clockwise, in arcs, or in concentric circles, and according to the priority of from near to far, specifically includes any of the following methods:

[0147] Method 1, Refer to Figure 4 , Assume that the B5 coil is the target transmitting coil. With the B5 coil as the center, search in sequence along the arc A5 - A6 - B6 - C6 - C5 - C4 - B4 - A4, that is, control A5 - A6 - B6 - C6 - C5 - C4 - B4 - A4 to work in sequence according to the search power, and at the same time obtain the received power of the receiving coil 15 when these transmitting coils work in sequence.

[0148] Method 2, Refer to Figure 5 , Assume that the B5 coil is the target transmitting coil. With the B5 coil as the center, search in sequence along the first concentric circle A6 - C6 - C5 - A5, that is, control A6 - C6 - C5 - A5 to work in sequence according to the search power, and at the same time obtain the received power of the receiving coil 15 when these transmitting coils work in sequence.

[0149] S93. Obtain the maximum value of all received powers, and determine the transmitting coil 210 corresponding to the maximum value as the new target transmitting coil.

[0150] Specifically, assume that the point corresponding to the maximum received power is found according to Method 1 or Method 2. If the point corresponding to the maximum received power is the B6 coil, then determine the B6 coil as the new target transmitting coil.

[0151] S94. Determine whether the maximum value is less than the minimum power threshold. If not, end the re-search phase and return to step S6. If so, proceed to the next step.

[0152] Specifically, obtain the transmitting power when the B6 coil is working and received by the receiving coil 15, that is, obtain the maximum value, and then determine whether the maximum value is less than the minimum power threshold. If the maximum value is greater than or equal to the minimum power threshold, end the re-search work and restart the power transmission in step S6. If the maximum value is still less than the minimum power threshold, proceed to the next step.

[0153] S95. With the new target transmitting coil as the center, control the adjacent transmitting coils 210 of the new target transmitting coil to work sequentially according to the search power, and at the same time obtain the received power of the receiving coil 15, and then return to step S93.

[0154] Specifically, with the new target transmitting coil as the center, continue the search according to step S92. Assume that the B6 coil is the center, then search sequentially in the order of arc A6 - A7 - B7 - C7 - C6 - C5 - B5 - A5, or search sequentially in the order of the first concentric circle A7 - C7 - C6 - A6, and at the same time obtain the received power of the receiving coil 15, and then return to step S93.

[0155] Before returning to step S93, if no transmitting coil that satisfies the transmitting power being greater than or equal to the minimum power threshold is found after searching to the outermost coil, return to step S3 for global search. Before returning to step S3, mark the temperature detection pot 1 as lost in the wireless power transmission MCU, end the search process, and wait for a certain period of time (such as 1 minute), and then repeat returning to step S3 for global search.

[0156] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A cooking appliance, characterized in that, Comprising: A temperature-detecting pot (1), including a pot body (11) and a pot handle (12). The pot body (11) is provided with a temperature-detecting group (13), and the pot handle (12) is provided with a receiving coil (15) and an electronic control board (16). The electronic control board (16) is electrically connected to the temperature-detecting group (13) and the receiving coil (15) respectively. A gas stove (2), including a panel (20), a burner (22) and a wireless power transmission MCU (23). The panel (20) is provided with a transmitting coil group (21) located outside the burner (22). The transmitting coil group (21) is connected to the wireless power transmission MCU (23), and the transmitting coil group (21) includes a plurality of transmitting coils (210). The wireless power transmission MCU (23) is communicatively connected to the temperature-detecting pot (1). The wireless power transmission MCU (23) is used to obtain the current working state of the temperature-detecting pot (1). The current working state includes the receiving power of the receiving coil (15), and is used to determine the precise position of the receiving coil (15) according to the receiving power. It is also used to determine whether to control the wireless power transmission MCU (23) to wirelessly transmit power to the temperature-detecting pot (1) according to the current combustion state of the burner (22) and the precise position of the receiving coil (15). Among them, determining the precise position of the receiving coil (15) according to the receiving power specifically includes: extracting the maximum value of all receiving powers; if the maximum value is greater than or equal to the minimum power threshold, then determining the transmitting coil (210) corresponding to the maximum value as the target transmitting coil, and determining that the receiving coil (15) is directly above the target transmitting coil.

2. The cooking appliance according to claim 1, characterized in that The transmitting coil group (21) includes a plurality of first transmitting coil groups (211) arranged side by side at equal intervals. Each first transmitting coil group (211) includes a plurality of transmitting coils (210) arranged in a row or an arc array. The wireless power transmission MCU (23) is connected to any one of the transmitting coils (210) through a wireless power transmission emission control circuit (26).

3. The cooking appliance according to claim 2, wherein, A second transmitting coil group (212) is provided between adjacent first transmitting coil groups (211). The second transmitting coil group (212) partially overlaps with adjacent two first transmitting coil groups (211) respectively, and the second transmitting coil group (212) includes a plurality of transmitting coils (210) arranged in a row or an arc array.

4. A cooking appliance according to claim 2 or 3, characterized in that, The wireless power transmission emission control circuit (26) includes a DC power input terminal (261) and a power semiconductor switch group (262). The power semiconductor switch group (262) is connected to both ends of the transmitting coil (210), and the power semiconductor switch group (262) is connected to the DC power input terminal (261).

5. A cooking appliance according to claim 1, characterized in that, The gas stove (2) further includes a combustion control system (24). The combustion control system (24) is electrically connected to the burner (22) and the wireless power transmission MCU (23) respectively.

6. A cooking appliance according to claim 1 or 5, characterized in that, A transmission power detection module (25) is connected between the wireless power transmission MCU (23) and the transmission coil group (21). The transmission power detection module (25) is used to detect the transmission power of the transmission coil group (21) in real time. The electronic control board (16) includes a reception power detection module (161) and a main control MCU (163). The reception power detection module (161) is used to detect the transmission power of the reception coil (15) in real time. The main control MCU (163) is electrically connected to the reception power detection module (161), the temperature detection group (13), and the reception coil (15) respectively.

7. The cooking appliance according to claim 6, wherein The transmission power detection module (25) includes a voltage detection circuit and a current detection circuit. The voltage detection circuit is connected between the transmission coil group (21) and the voltage detection port a3 of the wireless power transmission MCU (23). The current detection circuit is connected between the transmission coil group (21) and the current detection port a4 of the wireless power transmission MCU (23). The reception power detection module (161) includes a voltage detection circuit and a current detection circuit. The voltage detection circuit is connected between the reception coil (15) and the voltage detection port a1 of the main control MCU (163). The current detection circuit is connected between the reception coil (15) and the current detection port a2 of the main control MCU (163).

8. A cooking appliance according to claim 6, characterized in that, The electronic control board (16) further includes a supercapacitor (162) and a power management module (165). The supercapacitor (162) is connected to the reception power detection module (161) and the main control MCU (163) respectively. The power management module (165) is connected to the supercapacitor (162) and the main control MCU (163) respectively.

9. A cooking appliance according to claim 1, wherein, The temperature detection group (13) includes a plurality of thermocouple temperature probes (131). All the thermocouple temperature probes (131) are arranged at intervals at the bottom of the pot body (11). An NTC temperature sensor (164) is provided on the electronic control board (16) or the pot handle (12). The NTC temperature sensor (164) is electrically connected to the main control MCU (163) of the electronic control board (16).

10. A cooking appliance according to claim 1, characterized in that, A temperature display area (17) and / or a position indicator light (18) are further provided on the pot handle (12). The temperature display area (17) is electrically connected to the main control MCU (163) of the electronic control board (16) and is used to display different colors or different brightness according to the temperature of the pot body detected by the temperature detection group (13). The position indicator light (18) is electrically connected to the main control MCU (163) of the electronic control board (16) and is used to indicate whether the pot handle (12) is located above the transmission coil group.

11. A control method for a cooking appliance, which is applied to the cooking appliance as described in any one of claims 1-10. The control method includes: S1, obtaining the current combustion state of the burner (22), where the current combustion state includes a normal combustion state; S2. Determine whether the current combustion state is a normal combustion state. If so, enter the stage of searching for the position of the receiving coil; otherwise, continue to execute step S2. S3. Control each transmitting coil (210) in the transmitting coil group (21) to work sequentially at the search power, and simultaneously obtain the received power of the receiving coil (15). S4. Determine whether the temperature detection pot (1) or the gas stove (2) receives the received power of the receiving coil (15) after the transmitting coil group (21) finishes working. If so, enter the next step; otherwise, determine that the receiving coil (15) is not above the transmitting coil group (21). S5. Determine the precise positions of the target transmitting coil and the receiving coil (15) based on all the received power. S6. Enter the wireless power transmission stage. Control the wireless power transmission MCU (23) to wirelessly transmit power to the temperature detection pot (1) through the target transmitting coil, and the temperature detection pot (1) feeds back its current working state to the gas stove (2). Among them, the step of determining the precise positions of the target transmitting coil and the receiving coil (15) based on all the received power specifically includes: S51. Extract the maximum value of all the received power. S52. Determine whether the maximum value is less than the minimum power threshold. S53. If the maximum value is greater than or equal to the minimum power threshold, determine the transmitting coil (210) corresponding to the maximum value as the target transmitting coil, and determine that the receiving coil (15) is directly above the target transmitting coil.

12. The control method of a cooking appliance according to claim 11, wherein, The step of controlling each transmitting coil (210) in the transmitting coil group (21) to work sequentially at the search power specifically includes: S311. According to the global search order, control the first transmitting coil (210) in the transmitting coil group (21) to work at the search power. S312. Obtain the transmitted signal when the first reflecting coil works at the search power. S313. Calculate the actual transmitted power based on the transmitted signal. S314. Determine whether the actual transmitted power is within the set range. If not, adjust the search power and return to step S311; if so, control the next transmitting coil (210) in the transmitting coil group (21) to work at the search power.

13. The control method of a cooking appliance according to claim 11, wherein The step of determining the precise positions of the target transmitting coil and the receiving coil (15) based on all the received power specifically further includes: S54. If the maximum value is less than the minimum power threshold, determine that the receiving coil (15) is not above the transmitting coil group.

14. The control method of a cooking appliance according to claim 11, characterized in that, The step of controlling the wireless power transmission MCU (23) to wirelessly transmit power to the temperature detection pot (1) through the target transmitting coil specifically includes: S61. The wireless power transmission MCU (23) controls the target transmitting coil to work at the transmission power, and the transmission power is greater than the search power. S62. The receiving coil (15) receives the changing magnetic field and converts it into an electric field, and starts to charge the temperature detection pot (1).

15. A control method for a cooking appliance according to any one of claims 11-14, characterized in that, After step S6, the control method further includes: S7. Real-time detect the real-time received power of the receiving coil (15) during the wireless power transmission process. S8. Determine whether the real-time received power is less than the minimum power threshold. If so, transfer to the next step; otherwise, return to step S7. S9, increase the transmission power, and determine whether the increased transmission power reaches the maximum power threshold. If so, enter the re-search phase. If not, control the target transmitting coil to operate at the increased transmission power and return to step S7.

16. The control method of a cooking appliance according to claim 15, characterized in that, The steps of entering the re-search phase specifically include: S91, enter the re-search phase; S92, taking the target transmitting coil as the center of the circle, controlling the transmitting coils (210) adjacent to the target transmitting coil to operate in sequence according to the search power, and simultaneously obtaining the receiving power of the receiving coil (15); S93, obtaining the maximum value of all received powers, and determining the transmitting coil (210) corresponding to the maximum value as a new target transmitting coil; S94, determine whether the maximum value is less than the minimum power threshold, if not, end the re-search phase and return to step S6, if yes, proceed to the next step; S95, taking the new target transmitting coil as the center of the circle, controlling the transmitting coils (210) adjacent to the new target transmitting coil to operate in sequence according to the search power, and simultaneously obtaining the receiving power of the receiving coil (15), and then returning to step S93.

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