Cookware detection circuit, cooking utensil and heating control method

Abstract

The embodiment of the invention provides a cookware detection circuit, a cooking utensil and a heating control method. The cookware detection circuit comprises an induction electrode, a detection circuit and a control circuit, the induction electrode is arranged on the lower side of a panel of the cooking utensil; the input end of the detection circuit is connected with the output end of the induction electrode, and the output end of the detection circuit is connected with the input end of the control circuit; the induction electrode is used for forming a capacitor with a cookware placed on the upper side of the panel; the detection circuit is used for outputting a first switching value signal to the control circuit when the capacitance is detected to be formed; the control circuit is used for controlling a heater of the cooking utensil to operate when receiving the first switching value signal so as to heat the cookware. The method is used for achieving the effect of improving the accuracy and timeliness of the cookware detection function.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of household appliances, in particular to a pot detection circuit, a cooking appliance and a heating control method. BACKGROUND

[0002] Currently, some cooking appliance products do not have a pot detection function, and are prone to dry burning without a pot during use, which is a safety hazard. In view of this, a cooking appliance with a pot detection function has been developed.

[0003] The cooking appliance with a pot detection function determines whether to start the heating function to heat the pot by detecting whether a pot is placed on the panel. However, such a cooking appliance still has problems such as being easily disturbed and easily failing, which reduces the accuracy and timeliness of the pot detection function.

[0004] How to improve the accuracy and timeliness of the pot detection function remains to be solved. SUMMARY

[0005] The embodiments of the present application provide a pot detection circuit, a cooking appliance and a heating control method to improve the accuracy and timeliness of the pot detection function.

[0006] In a first aspect, the embodiments of the present application provide a pot detection circuit, which comprises an induction electrode, a detection circuit and a control circuit.

[0007] The induction electrode is arranged on the lower side of the panel of the cooking appliance.

[0008] The detection circuit is connected to the output end of the induction electrode at the input end and connected to the input end of the control circuit at the output end.

[0009] The induction electrode is used to form a capacitor with a pot placed on the upper side of the panel.

[0010] The detection circuit is used to output a first switching quantity signal to the control circuit when the capacitor is formed.

[0011] The control circuit is used to control the operation of the heater of the cooking appliance to heat the pot when the first switching quantity signal is received.

[0012] In a possible implementation, the detection circuit is further used to output a second switching quantity signal to the control circuit when the capacitor is not detected.

[0013] The control circuit is used to control the heater of the cooking appliance to stop operating when the second switching quantity signal is received.

[0014] In a possible implementation, the detection circuit comprises an oscillation circuit, a signal conversion circuit and a switch conversion circuit;

[0015] The input end of the oscillation circuit is connected with the output end of the induction electrode, and the output end is connected with the input end of the signal conversion circuit; the output end of the signal conversion circuit is connected with the input end of the switch conversion circuit; and the output end of the switch conversion circuit is connected with the input end of the control circuit.

[0016] The oscillation circuit is configured to output a first pulse signal when the capacitor is formed.

[0017] The signal conversion circuit is configured to convert the output frequency of the first pulse signal into a first voltage quantity signal.

[0018] The switch conversion circuit is configured to convert the first voltage quantity signal into the first switch quantity signal, and the first switch quantity signal is a digital signal.

[0019] In a possible implementation, the oscillation circuit is further configured to output a second pulse signal when the capacitor is not formed, and the output frequency of the first pulse signal is greater than the output frequency of the second pulse signal.

[0020] The signal conversion circuit is further configured to convert the output frequency of the second pulse signal into a second voltage quantity signal.

[0021] The switch conversion circuit is further configured to convert the second voltage quantity signal into the second switch quantity signal, and the second switch quantity signal is a digital signal.

[0022] In a possible implementation, the oscillation circuit comprises a flip-flop, a voltage dividing resistor and a first capacitor.

[0023] The first end of the voltage dividing resistor is configured to be connected with an external power supply, the second end is connected with the first input end of the flip-flop, and the third end is configured to be connected with the pot placed on the upper side of the panel.

[0024] The first end of the first capacitor is connected with the induction electrode, and the second end is connected with a first power supply end, and the voltage of the first power supply end is less than the voltage of the external power supply.

[0025] The second input end and the third input end of the flip-flop are connected with the external power supply, and the fourth input end is connected with the first power supply end.

[0026] The output end of the flip-flop is the output end of the oscillation circuit.

[0027] In a possible implementation, the signal conversion circuit comprises a phase-locked loop circuit and an amplification circuit.

[0028] The input end of the phase-locked loop circuit is connected with the output end of the oscillation circuit, and the output end of the phase-locked loop circuit is connected with the input end of the amplification circuit;

[0029] The output end of the amplification circuit is connected with the input end of the switch conversion circuit;

[0030] The phase-locked loop circuit is used for converting the first pulse signal into an initial first voltage quantity signal and converting the second pulse signal into an initial second voltage quantity signal;

[0031] The amplification circuit is used for amplifying the initial first voltage quantity signal and outputting the first voltage quantity signal, and amplifying the initial second voltage quantity signal and outputting the second voltage quantity signal.

[0032] In a possible implementation, the detection circuit further comprises a signal processing circuit;

[0033] The input end of the signal processing circuit is connected with the output end of the signal conversion circuit, and the output end of the signal processing circuit is connected with the input end of the switch conversion circuit;

[0034] The signal processing circuit is used for amplifying and / or shaping the signal output by the signal processing circuit and then outputting the switch conversion signal.

[0035] In a possible implementation, the first switch quantity signal is a high-level signal, and the second switch quantity signal is a low-level signal.

[0036] In a second aspect, the present application provides a cooking appliance, comprising:

[0037] The pot detection circuit as described in the first aspect;

[0038] A panel, the inductive electrode in the pot detection circuit is arranged on the lower side of the panel;

[0039] A heater arranged on the lower side of the panel and used for operating under the control of the pot detection circuit.

[0040] In a third aspect, the present application provides a heating control method applied to the cooking appliance as described in the second aspect, comprising:

[0041] When the pot detection circuit detects that the panel is placed with a pot, the heater of the cooking appliance is controlled to heat the pot.

[0042] In a possible implementation, the method further comprises:

[0043] When the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a running state, the heater is controlled to stop running.

[0044] When the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a running state, the heater is controlled to stop running.

[0045] The pot detection circuit provided by the embodiment of the present application detects the pot based on the detection principle of the capacitive proximity switch. Specifically, the sensing electrode of the capacitive proximity switch is arranged on the lower side of the panel. After the pot detection circuit is powered on, when the pot is placed on the panel and forms a capacitor with the sensing electrode, the heater of the cooking appliance is controlled to heat the pot. The capacitive proximity switch has fast response speed and high accuracy, so that the pot detection circuit provided by the embodiment of the present application can improve the accuracy and timeliness of the pot detection function. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0047] Figure 1 The structure schematic diagram of the pot detection circuit provided by one embodiment of the present application is shown in the figure;

[0048] Figure 2 The structure schematic diagram of the pot detection circuit provided by another embodiment of the present application is shown in the figure;

[0049] Figure 3 The structure schematic diagram of the detection circuit in the pot detection circuit provided by another embodiment of the present application is shown in the figure;

[0050] Figure 4 The structure schematic diagram of the pot detection circuit provided by another embodiment of the present application is shown in the figure;

[0051] Figure 5 The structure schematic diagram of the cooking appliance provided by one embodiment of the present application is shown in the figure;

[0052] Figure 6 The structure schematic diagram of the cooking appliance provided by another embodiment of the present application is shown in the figure;

[0053] Figure 7 The flowchart of the heating control method provided by one embodiment of the present application is shown in the figure;

[0054] Figure 8 The structure schematic diagram of the heating control device provided by the present application is shown in the figure;

[0055] Figure 9 The structure schematic diagram of the electronic device provided by the present application is shown in the figure.

[0056] Reference numerals:

[0057] 10 - pot detection circuit; 11 - inductive electrode; 12 - detection circuit; 13 - control circuit;

[0058] 20 - cooking appliance; 21 - panel; 22 - heater; 23 - coil support; 24 - support spring; 25 - hob assembly; 26 - hob spring; 27 - printed circuit board;

[0059] 121 - oscillation circuit; 122 - signal conversion circuit; 123 - switch conversion circuit; 124 - flip-flop; 125 - voltage dividing resistor; 126 - phase-locked loop circuit; 127 - amplification circuit; 128 - amplifier; 129 - signal processing circuit.

[0060] The specific embodiments of the application have been shown by the above-described drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the inventive concept in any way, but to illustrate the inventive concept by reference to specific embodiments. DETAILED DESCRIPTION

[0061] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The same or similar components are denoted by the same or similar reference numerals throughout the drawings and the written description, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the application as detailed in the appended claims.

[0062] At present, some cooking appliances do not have a pot detection function, and the dry burning phenomenon of no pot is prone to occur during use, which has a great safety hazard. In view of this, a cooking appliance with a pot detection function is developed. The cooking appliance with a pot detection function detects whether a pot is placed on the panel to determine whether to start the heating function to heat the pot. However, this type of cooking appliance detects whether a pot is placed on the panel by using the principles of infrared induction, microwave or laser reflection, which not only has high cost, but also has problems of being easily disturbed and easily failing, thereby reducing the accuracy and timeliness of the pot detection function.

[0063] Based on this, the application provides a pot detection circuit, a cooking appliance and a heating control method.

[0064] The pot detection circuit comprises an induction electrode, a detection circuit and a control circuit. The induction electrode is arranged on the lower side of the panel of the cooking appliance. The induction electrode is used to form a capacitor with the pot placed on the upper side of the panel. The input end of the detection circuit is connected with the output end of the induction electrode, and the output end is connected with the input end of the control circuit. The detection circuit is used to output a first switching quantity signal to the control circuit when the capacitor is formed. The control circuit is used to control the heater of the cooking appliance to heat the pot when the first switching quantity signal is received.

[0065] The pot detection circuit provided by the application is based on the detection principle of the capacitive proximity switch. Specifically, the induction electrode of the capacitive proximity switch is arranged on the lower side of the panel. After the pot detection circuit is powered on, when the pot is placed on the panel and forms a capacitor with the induction electrode, the heater of the cooking appliance is controlled to heat the pot. The capacitive proximity switch has fast response speed and high accuracy, so that the pot detection circuit provided by the application can improve the accuracy and timeliness of the pot detection function.

[0066] Please refer to Figure 1 The application provides a pot detection circuit 10 comprising an induction electrode 11, a detection circuit 12 and a control circuit 13.

[0067] The induction electrode 11 is arranged on the lower side of the panel of the cooking appliance. The panel refers to the heating panel, and the pot is placed on the upper side of the panel. The induction electrode 11 can be arranged at any position on the lower side of the panel, or at a specified position on the lower side of the panel.

[0068] The induction electrode 11 is used to form a capacitor with the pot placed on the upper side of the panel. The upper side of the panel cannot form a capacitor when the pot is not placed thereon.

[0069] The material of the pot can be metal, alloy or non-metal.

[0070] The size and shape of the induction electrode 11 can be set according to actual needs, as long as it can form a capacitor with the pot placed on the panel.

[0071] The pot can form a capacitor with the induction electrode 11 when it is placed on the specified area on the upper side of the panel. The pot can form a capacitor with the induction electrode 11 when it is placed on any area on the upper side of the panel.

[0072] The induction electrode 11 is the induction electrode 11 of the capacitive proximity switch. The induction electrode 11 of the capacitive proximity switch is arranged on the lower side of the panel. After the pot detection circuit 10 is powered on, when the pot is placed on the panel and forms a capacitor with the induction electrode 11. The capacitive proximity switch has fast response speed and high accuracy.

[0073] The input end of the detection circuit 12 is connected with the output end of the induction electrode 11, and the detection circuit 12 is also connected with the output end of the pot if the pot is placed on the upper side of the panel. The output end of the detection circuit 12 is connected with the input end of the control circuit 13.

[0074] The detection circuit 12 is used to detect whether the induction electrode 11 forms a capacitor. When the induction electrode 11 and the pot form a capacitor, a corresponding capacitor value also appears, and the detection circuit 12 can detect whether the induction electrode 11 and the pot form a capacitor by detecting the capacitor value. For example, when the capacitor value increases on the basis of the original capacitor value, the detection circuit 12 determines that the induction electrode 11 and the pot form a capacitor. For example, when the capacitor value is the original capacitor value, the detection circuit 12 determines that the induction electrode 11 and the pot do not form a capacitor.

[0075] When the detection circuit 12 detects that the capacitor is formed, the detection circuit 12 outputs a first switching quantity signal to the control circuit 13. The first switching quantity signal can be a pulse signal, in which a high level represents that the capacitor is formed, and a low level represents that the capacitor is not formed. Correspondingly, when the control circuit 13 receives the first switching quantity signal, the control circuit 13 controls the heater of the cooking appliance to operate to heat the pot.

[0076] The detection circuit 12 is a circuit that is affected by the capacitor value of the capacitor to cause the output signal to change, and can include an oscillation circuit 121, an F / V conversion circuit, and the like.

[0077] The oscillation circuit 121 outputs a pulse signal, and the F / V conversion circuit outputs a voltage signal according to the frequency of the output signal. The oscillation circuit 121 is affected by the capacitor value of the capacitor to change the frequency of the output pulse signal, and thus the voltage signal output by the F / V conversion circuit changes. The control circuit 13 detects the voltage signal to determine whether the capacitor is formed, and thus determines whether to start the heater.

[0078] When the control circuit 13 receives the first switching quantity signal, the control circuit 13 controls the heater of the cooking appliance to operate to heat the pot placed on the upper side of the panel. The control circuit 13 can be a microcontroller unit (MCU), and the first switching quantity signal can be a high level signal. That is, when the pin of the microcontroller receives the high level signal output by the detection circuit 12, the microcontroller controls the heater to operate.

[0079] The running state of the heater at the previous moment does not affect the running state of the heater at this moment. The state of the heater at the previous moment can be running (the pot is placed on the panel) or stopping running (the pot is not placed on the panel).

[0080] In summary, the pot detection circuit 10 provided in this embodiment is based on the detection principle of the capacitive proximity switch. Specifically, the sensing electrode 11 of the capacitive proximity switch is arranged on the lower side of the panel. After the pot detection circuit 10 is powered on, when the pot is placed on the panel and forms a capacitor with the sensing electrode 11, the heater of the cooking appliance is controlled to heat the pot. The capacitive proximity switch has a fast response speed and high accuracy, so the pot detection circuit 10 provided in this embodiment can improve the accuracy and timeliness of the pot detection function.

[0081] Also see Figure 1 In some embodiments, the detection circuit 12 is further configured to output a second switching quantity signal to the control circuit 13 when the capacitor is not formed. The control circuit 13 is configured to control the heater of the cooking appliance to stop running when the second switching quantity signal is received.

[0082] The second switching quantity signal can be a pulse signal. If the first switching quantity signal is a high-level signal, the second switching quantity signal can be a low-level signal, where the high-level signal represents the formation of the capacitor, and the low-level signal represents the absence of the capacitor.

[0083] The detection circuit 12 is configured to output a second switching quantity signal to the control circuit 13 when the capacitor is not formed. That is, when there is no pot placed on the panel, the sensing electrode 11 cannot form a capacitor with the pot, and the detection circuit 12 continuously outputs the second switching quantity signal to the control circuit 13. Correspondingly, the control circuit 13 controls the heater to stop running when a high second switching quantity signal is received.

[0084] It can be understood that the pot was previously placed on the panel or not placed on the panel, as long as there is no pot placed on the panel at this moment, the heater is controlled to stop running. The running state of the heater at the previous moment does not affect the running state of the heater at this moment. The state of the heater at the previous moment can be running (with a pot placed on the panel) or stopping running (with no pot placed on the panel).

[0085] In this embodiment, when the capacitor is not formed, the detection circuit 12 timely outputs the second switching quantity signal to the control circuit 13, and the control circuit 13 timely controls the heater of the cooking appliance to stop running when the second switching quantity signal is received. In this way, when the pot is removed from the panel, the heating of the panel is stopped in time, preventing dry burning and reducing the damage to the cooking appliance and improving the use effect of the cooking appliance. Similarly, the pot detection circuit 10 provided in this embodiment is based on the detection principle of the capacitive proximity switch, has a fast response speed and high accuracy, and can improve the accuracy and timeliness of the pot detection function.

[0086] SeeFigure 2 In one embodiment of the present application, the detection circuit 12 comprises an oscillation circuit 121, a signal conversion circuit 122 and a switch conversion circuit 123.

[0087] The input terminal of the oscillation circuit 121 is connected to the output terminal of the induction electrode 11, and the output terminal is connected to the input terminal of the signal conversion circuit 122. The output terminal of the signal conversion circuit 122 is connected to the input terminal of the switch conversion circuit 123. The output terminal of the switch conversion circuit 123 is connected to the input terminal of the control circuit 13.

[0088] The oscillation circuit 121 is configured to output a first pulse signal when the capacitor is formed. The signal conversion circuit 122 is configured to convert the output frequency of the first pulse signal into a first voltage signal. The switch conversion circuit 123 is configured to convert the first voltage signal into a first switch signal, which is a digital signal.

[0089] Further, the oscillation circuit 121 is also configured to output a second pulse signal when the capacitor is not formed. The output frequency of the first pulse signal is greater than the output frequency of the second pulse signal. The signal conversion circuit 122 is also configured to convert the output frequency of the second pulse signal into a second voltage signal. The switch conversion circuit 123 is also configured to convert the second voltage signal into a second switch signal, which is a digital signal.

[0090] Specifically, one input terminal of the oscillation circuit 121 is connected to the output terminal of the induction electrode 11, and the other input terminal is connected to the pot. When the pot is placed on the upper side of the panel, the pot forms the capacitor with the induction electrode 11, and the capacitor is part of the oscillation circuit 121. The frequency of the pulse signal output by the oscillation circuit 121 is affected by the capacitance value of the capacitor.

[0091] When the capacitor is not formed, the oscillation circuit 121 outputs a second pulse signal, and the frequency of the pulse signal is constant. The signal conversion circuit 122 converts the output frequency of the second pulse signal into a second voltage signal, and the switch conversion circuit 123 converts the second voltage signal into a second switch signal. The control circuit 13 controls the heater to stop running when receiving the second switch signal.

[0092] When the capacitor is formed, the frequency of the pulse signal output by the oscillation circuit 121 is increased, so that the signal conversion circuit 122 receives a pulse signal with a faster frequency (first pulse signal). Correspondingly, the voltage value of the first voltage quantity signal is greater than that of the second voltage quantity signal, the first switch quantity signal is a high-level signal, and the second switch quantity signal is a low-level signal. The first switch quantity signal and the second switch quantity signal are both digital signals, the first switch quantity signal is 1, and the second switch quantity signal is 0.

[0093] The oscillation circuit 121 can be an LC oscillation circuit 121 (LC circuit). The signal conversion circuit 122 can be an F / V conversion circuit. The switch conversion circuit 123 can be an analog-to-digital converter (A / D converter).

[0094] The control circuit 13 can also be connected to a display system as shown in the figure, which displays information such as heating or stopping heating, so that the user can know the working state of the cooking utensil in time and improve the use effect of the cooking utensil. The display system includes a display screen on the cooking utensil.

[0095] The detection circuit 12 provided by the embodiment includes an oscillation circuit 121, a signal conversion circuit 122, and a switch conversion circuit 123. The oscillation circuit 121 is configured to output a first pulse signal when a capacitor is formed and output a second pulse signal when the capacitor is not formed. The frequency of the first pulse signal is greater than that of the second pulse signal. The signal conversion circuit 122 is configured to convert the output frequency quantity of the first pulse signal into a first voltage quantity signal and convert the output frequency quantity of the second pulse signal into a second voltage quantity signal. The voltage value of the first voltage quantity signal is greater than that of the second voltage quantity signal. The switch conversion circuit 123 is configured to convert the first voltage quantity signal into a first switch quantity signal and convert the second voltage quantity signal into a second switch quantity signal. The first switch quantity signal is 1, and the second switch quantity signal is 0.

[0096] In this way, when the pot is not placed on the upper side of the panel, the control circuit 13 continuously receives the second switch quantity signal, and the heater does not operate. When the pot is placed on the upper side of the panel, the pot forms a capacitor with the induction electrode 11, which affects the frequency of the pulse signal output by the oscillation circuit 121, so that the control circuit 13 receives the first switch quantity signal. When the control circuit 13 receives the first switch quantity signal, the heater is controlled to operate immediately to heat the pot. The pot detection circuit 10 provided by the embodiment is based on the detection principle of the capacitive proximity switch, has fast response speed and high accuracy, and can improve the accuracy and timeliness of the pot detection function.

[0097] Please refer toFigure 3 In one embodiment of this application, the oscillation circuit 121 includes a trigger 124, a voltage divider resistor 125, and a first capacitor C2.

[0098] The first end of the voltage divider resistor 125 is used to connect to an external power supply, the second end is connected to the first input terminal of the trigger 124, and the third end is used to connect to the cookware placed on the upper side of the panel.

[0099] The voltage divider resistor 125 may include, for example: Figure 3 Resistors R1 and R2 are shown. The first terminal of resistor R1 is the first terminal of the voltage divider resistor 125 and is connected to an external power supply (VCC shown in the figure). The second terminal of resistor R1 is connected to the first terminal of the voltage divider resistor 125. The second terminal of resistor R2 is the third terminal of the voltage divider resistor 125. When a pot is placed on the top of the panel, the second terminal of resistor R2 is used to connect to the pot on the top of the panel. When no pot is placed on the top of the panel, the second terminal of resistor R2 is used to connect to the panel itself.

[0100] The resistors included in the voltage divider resistor 125 can be selected according to actual needs, and this embodiment does not limit them.

[0101] The first terminal of the first capacitor C2 is connected to the sensing electrode 11, and the second terminal is connected to the first power supply terminal. The voltage of the first power supply terminal is less than the voltage of the external power supply. The first power supply terminal is ground as shown in the figure. The first power supply terminal can also be other power supply terminals, as long as the voltage of the first power supply terminal is less than the voltage of the external power supply.

[0102] The first capacitor C2 is used to adjust the sensitivity of the oscillation circuit 121. Specifically, the first capacitor C2 is an adjustable capacitor; by adjusting the capacitance value of the first capacitor C2, the sensitivity of the oscillation circuit 121 can be changed. Figure 3 The capacitor C1 shown is the equivalent capacitance formed by the cookware and the sensing electrode 11. When the capacitance value of capacitor C1 is small, its impact on the frequency of the output pulse signal of the oscillation circuit 121 is small, and it may be difficult to detect the presence of a cookware. Therefore, the impact of the capacitance value of capacitor C1 on the pulse signal frequency can be increased by increasing the capacitance value of the first capacitor C2. In other words, by increasing the capacitance value of the first capacitor C2, the sensitivity of the oscillation circuit 121 can be increased, thereby increasing the sensitivity of the detection circuit 12.

[0103] The second input end and the third input end of the flip-flop 124 are connected with the external power supply, and the fourth input end is connected with the first power supply end. The flip-flop 124 can be a 555 timer as shown in the figure. The pin 4 and the pin 8 (the second input end and the third input end) of the 555 timer are connected with the external power supply (VCC as shown in the figure). The pin 7 (the first input end) of the 555 timer is connected with the second end of the voltage dividing resistor 125. The pin 2 and the pin 6 of the 555 timer are connected with the third end of the voltage dividing resistor 125. The pin 1 of the 555 timer is connected with the first power supply end. The pin 3 of the 555 timer is the output end of the flip-flop 124, which is used to output the first pulse signal or the second pulse signal. The output end of the flip-flop 124 is the output end of the oscillation circuit 121.

[0104] The oscillation frequency of the oscillation circuit 121 is f = 1 / 0.69*(R1+2*R2)*(C / / CT), wherein C represents the equivalent capacitance of the capacitor C1 and the capacitor C2. The larger the C is, the higher the oscillation frequency is, and the larger the output frequency of the output pulse signal is.

[0105] The oscillation circuit 121 provided by the embodiment includes the flip-flop 124, the voltage dividing resistor 125 and the first capacitor C2. The voltage dividing resistor 125 is used to support the flip-flop 124 to output the pulse signal, and the first capacitor C2 is used to adjust the sensitivity of the oscillation circuit 121. When the equivalent capacitance value of the capacitor C1 formed by the pot and the induction electrode 11 is small, the sensitivity of the oscillation circuit 121 can be increased by increasing the capacitance value of the first capacitor C2, so that the detection circuit 12 is more likely to detect that the pot is placed on the upper side of the panel. The oscillation circuit 121 provided by the embodiment can adjust the sensitivity according to actual needs, which improves the accuracy of pot detection and improves the timeliness of pot detection.

[0106] Please also refer to Figure 3 In some embodiments, the signal conversion circuit 122 includes a phase-locked loop circuit 126 and an amplification circuit 127.

[0107] The input end of the phase-locked loop circuit 126 is connected with the output end of the oscillation circuit 121, and the output end of the phase-locked loop circuit 126 is connected with the input end of the amplification circuit 127. The output end of the amplification circuit 127 is connected with the input end of the switch conversion circuit 123. The phase-locked loop circuit 126 is used to convert the first pulse signal into an initial first voltage quantity signal and convert the second pulse signal into an initial second voltage quantity signal. The amplification circuit 127 is used to amplify the initial first voltage quantity signal and output the first voltage quantity signal, and amplify the initial second voltage quantity signal and output the second voltage quantity signal. The phase-locked loop circuit 126 can include a CMOS phase-locked loop integrated circuit (such as a CD4046 device shown in the figure), a second capacitor C3, a third capacitor C4, a resistor R3, and a resistor R4. The first end and the second end of the second capacitor C3 are connected with pin 6 and pin 7 of the CD4046 device respectively. Pin 16 of the phase-locked loop circuit 126 is connected with an external power supply (such as VCC shown in the figure). The first end of the resistor R3 is connected with pin 11 of the CD4046 device, and the second end of the resistor R3 is connected with a first power supply end (such as a ground end shown in the figure). The first end of the resistor R4 is connected with pin 2 of the CD4046 device, and the second end of the resistor R4 is connected with the first end of the third capacitor C4. The second end of the third capacitor C4 is connected with the first power supply end (such as the ground end shown in the figure). Pin 15 of the CD4046 device is the output end of the phase-locked loop circuit 126, which is used to output the first voltage quantity signal and the second voltage quantity signal.

[0108] As shown in the figure, the amplification circuit 127 can include an amplifier 128, a resistor R5, a resistor R6, and a resistor R7.

[0109] The first end of the resistor R5 is connected with the output end of the phase-locked loop circuit 126, and the second end of the resistor R5 is connected with the first input end of the amplifier 128. The second input end of the amplifier 128 is connected with the first end of the resistor R6, and the second end of the resistor R6 is connected with the first power supply end (such as the ground end shown in the figure). The second input end of the amplifier 128 is also connected with the first end of the resistor R7, and the second end of the resistor R7 is connected with the output end of the amplifier 128. The amplifier 128 is also connected with an external power supply (such as VCC shown in the figure) and the first power supply end (such as the ground end shown in the figure).

[0110] The amplifier 128 is configured to amplify the first voltage quantity signal and the second voltage quantity signal, and transmit the first voltage quantity signal and the second voltage quantity signal to the switching conversion circuit 123. Specifically, the amplifier 128 is configured to linearly amplify the first voltage quantity signal and the second voltage quantity signal, and input the linearly amplified first voltage quantity signal and the second voltage quantity signal to the input end of the switching conversion circuit 123. The switching conversion circuit 123 can be an A / D converter as shown in the figure. When the single-chip microcomputer is used as the control circuit 13, the switching conversion circuit 123 can be connected to the PC0 pin of the single-chip microcomputer. When the single-chip microcomputer receives a high-level signal through the PC0 pin, the single-chip microcomputer controls the heater to operate; when the single-chip microcomputer receives a low-level signal through the PC0 pin, the single-chip microcomputer controls the heater to stop operating.

[0111] The amplifier 128 can improve the sensitivity of the detection circuit 12 by amplifying the first voltage quantity signal and the second voltage quantity signal.

[0112] The resistance included in the amplification circuit 127 can be set according to actual needs, and the embodiment is not limited in this regard.

[0113] The signal conversion circuit 122 provided in the embodiment includes a phase-locked loop circuit 126 and an amplification circuit 127. The signal conversion circuit 122 can convert the output frequency quantity of the pulse signal output by the oscillation circuit 121 into a voltage quantity signal, and output the voltage quantity signal. The greater the output frequency quantity of the pulse signal, the greater the voltage value of the voltage quantity signal. The initial voltage quantity signal output by the phase-locked loop circuit 126 can be further amplified by the amplification circuit 127, thereby improving the sensitivity of the detection circuit 12.

[0114] In some embodiments, referring to Figure 4 The detection circuit 12 can further include a signal processing circuit 129. The input end of the signal processing circuit 129 is connected to the output end of the signal conversion circuit 122, and the output end of the signal processing circuit 129 is connected to the input end of the switching conversion circuit 123. The signal processing circuit 129 is configured to amplify and / or shape the signal output by the signal processing circuit 129, and output the amplified and / or shaped signal to the switching conversion circuit 123. The signal processing circuit 129 can include a shaping circuit, an amplification circuit 127, and the like, and the embodiment is not limited in this regard.

[0115] Referring to Figure 5 One embodiment of the present application further provides a cooking appliance 20, which includes the pot detection circuit 10 described in any of the above embodiments, and further includes a panel 21 and a heater 22.

[0116] The pot detection circuit 10 can be arranged in a printed circuit board 27 as shown in the figure. The description of the pot detection circuit 10 can refer to the specific description of the pot detection circuit 10 described above, and will not be repeated here.

[0117] The inductive electrode 11 in the pot detection circuit 10 is arranged on the lower side of the panel 21. Specifically, referring to Figure 6 The panel 21 is provided with a coil support 23, and the inductive electrode 11 can be arranged on the coil support 23. The cooking appliance 20 further comprises a support spring 24 of the coil support 23, which is used to support the movability of the coil support 23.

[0118] The heater 22 is arranged on the lower side of the panel 21 and is used to operate under the control of the pot detection circuit 10. The heater 22 can comprise a hob assembly 25 and a hob spring 26 as shown in the figure, and the hob spring 26 is used to support the movability of the hob assembly 25.

[0119] Optionally, when the pot is placed on the A area (circular area) marked on the panel 21, an electric capacity is formed with the inductive electrode 11 arranged on the coil support 23.

[0120] The cooking appliance 20 can further comprise other components, which are not limited in the embodiment.

[0121] The cooking appliance 20 provided by the embodiment can perform pot detection based on the detection principle of the capacitive proximity switch. Specifically, the inductive electrode 11 of the capacitive proximity switch is arranged on the lower side of the panel 21. After the pot detection circuit 10 is powered on, when the pot is placed on the panel 21 and forms an electric capacity with the inductive electrode 11, the heater 22 of the cooking appliance 20 is controlled to heat the pot. The capacitive proximity switch has fast response speed and high accuracy, so that the cooking appliance 20 provided by the embodiment can improve the accuracy and timeliness of the pot detection function.

[0122] Referring to Figure 7 One embodiment of the present application further provides a heating control method. The heating control method is applied to the cooking appliance provided by any one of the above embodiments.

[0123] The heating control method comprises:

[0124] S701, when the pot detection circuit detects that the pot is placed on the panel, the heater of the cooking appliance is controlled to heat the pot.

[0125] The description of the pot detection circuit can refer to the detailed description of the pot detection circuit in the above embodiments, which will not be repeated here.

[0126] Since the pot detection circuit is based on the detection principle of the capacitive proximity switch, the capacitive proximity switch has fast response speed and high accuracy, so that when the pot is placed on the panel, the heater can be quickly started to heat the pot.

[0127] Optionally, when the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a non-running state, the control module controls the heater not to run. When the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a running state, the control module controls the heater to stop running.

[0128] The cooking appliance in a non-running state can be understood as the cooking appliance in a standby state. The cooking appliance in a running state can be understood as the cooking appliance in a working state. The standby state indicates that the cooking appliance is enabled, and the pot is not yet placed on the panel. The working state indicates that the cooking appliance is enabled, and the pot has been heated by the heater.

[0129] The heating control method provided in the embodiment can ensure that when the user places the pot on the panel, the pot is detected in time, and the heating function is unlocked. In addition, when the user removes the pot, the heating can be stopped in time. Compared with the heating control method of the traditional cooking appliance, the heating control method provided in the embodiment can improve the accuracy and timeliness of the pot detection function.

[0130] Figure 8 A structure diagram of the heating control device provided in the present application is shown in FIG. 8. The heating control device 80 provided in the embodiment includes: Figure 8

[0131] The detection module 81 is configured to detect, by the pot detection circuit, whether the pot is placed on the panel.

[0132] The control module 82 is configured to control the heater of the cooking appliance to heat the pot when the pot detection circuit detects that the pot is placed on the panel.

[0133] In a possible implementation, the control module 82 is specifically configured to, when the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a non-running state, control the heater not to run; and when the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a running state, control the heater to stop running.

[0134] The heating control device 80 provided in the embodiment can execute the heating control method provided in the method embodiment, and has similar implementation principles and technical effects, which will not be described here.

[0135] Figure 9 A structure diagram of the electronic device provided in the present application is shown in FIG. 9. The electronic device 90 provided in the embodiment includes: Figure 9 ​As shown, the electronic device 90 provided by the embodiment includes at least one processor 901 and a memory 902. Optionally, the device 90 further includes a communication component 903. Wherein, the processor 901, the memory 902 and the communication component 903 are connected through a bus 904.

[0136] In the process of implementation, the at least one processor 901 executes the computer execution instructions stored in the memory 902, so that the at least one processor 901 executes the above-mentioned method.

[0137] The specific implementation process of the processor 901 can refer to the above-mentioned method embodiment, which has similar implementation principles and technical effects, and will not be described here in detail.

[0138] In the above-mentioned embodiments, it should be understood that the processor can be a central processing unit (English: Central Processing Unit, for short: CPU), and can also be other general-purpose processors, digital signal processors (English: Digital Signal Processor, for short: DSP), application specific integrated circuits (English: Application Specific Integrated Circuit, for short: ASIC) and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor and the like. The steps of the method disclosed in combination with the application can be directly embodied as the execution of the hardware processor, or executed by the combination of hardware and software modules in the processor.

[0139] The memory can contain a random access memory (Random Access Memory, RAM), and can also include a non-volatile memory (Non-volatile Memory, NVM), for example, at least one disk memory.

[0140] The bus can be an industry standard architecture (Industry Standard Architecture, ISA) bus, a peripheral component (Peripheral Component, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus and the like. The bus can be divided into an address bus, a data bus, a control bus and the like. For the convenience of representation, the bus in the drawings of the present application does not limit only one bus or one type of bus.

[0141] The present application also provides a computer program product, including a computer program, which is executed by the processor to realize the above-mentioned method.

[0142] The application further provides a computer readable storage medium, and the computer readable storage medium stores computer execution instructions.

[0143] The readable storage medium can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0144] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0145] The division of units is only a logical function division, and in actual implementation, there can be another division mode, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0146] The units described as division components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment.

[0147] In addition, the functional units in each embodiment of the application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0148] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0149] It can be understood by those skilled in the art that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0150] Finally, it should be noted that: those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application that follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed in the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A pan detection circuit, characterized by, The inductive electrode, the detection circuit and the control circuit are included. The inductive electrode is arranged at the lower side of the panel of the cooking utensil. The detection circuit is connected with the output end of the inductive electrode at the input end and connected with the input end of the control circuit at the output end. The inductive electrode is used to form a capacitor with the pot placed on the upper side of the panel. The detection circuit is used to output a first switching quantity signal to the control circuit when the capacitor is formed. The control circuit is used to control the heater of the cooking utensil to operate to heat the pot when the first switching quantity signal is received.

2. The pan detection circuit of claim 1, wherein, The detection circuit is also used to output a second switching quantity signal to the control circuit when the capacitor is not formed. The control circuit is used to control the heater of the cooking utensil to stop operating when the second switching quantity signal is received.

3. The pan detection circuit of claim 2, wherein, The detection circuit includes an oscillation circuit, a signal conversion circuit and a switching conversion circuit. The input end of the oscillation circuit is connected with the output end of the inductive electrode, the output end of the oscillation circuit is connected with the input end of the signal conversion circuit, the output end of the signal conversion circuit is connected with the input end of the switching conversion circuit, and the output end of the switching conversion circuit is connected with the input end of the control circuit. The oscillation circuit is used to output a first pulse signal when the capacitor is formed. The signal conversion circuit is used to convert the output frequency of the first pulse signal into a first voltage quantity signal. The switching conversion circuit is used to convert the first voltage quantity signal into the first switching quantity signal, and the first switching quantity signal is a digital signal.

4. The pan detection circuit of claim 3, wherein, The oscillation circuit is also used to output a second pulse signal when the capacitor is not formed, and the output frequency of the first pulse signal is greater than the output frequency of the second pulse signal. The signal conversion circuit is also used to convert the output frequency of the second pulse signal into a second voltage quantity signal. The switching conversion circuit is also used to convert the second voltage quantity signal into the second switching quantity signal, and the second switching quantity signal is a digital signal.

5. The pan detection circuit of claim 3, wherein, The oscillation circuit includes a flip-flop, a voltage dividing resistor and a first capacitor. The first end of the voltage dividing resistor is connected with an external power supply, the second end is connected with the first input end of the flip-flop, and the third end is connected with the pot placed on the upper side of the panel. The first end of the first capacitor is connected with the inductive electrode, and the second end is connected with a first power supply end, and the voltage of the first power supply end is less than the voltage of the external power supply. The second input end and the third input end of the flip-flop are connected with the external power supply, and the fourth input end is connected with the first power supply end. The output end of the flip-flop is the output end of the oscillation circuit.

6. The pan detection circuit of claim 3, wherein, The signal conversion circuit includes a phase-locked loop circuit and an amplification circuit. The input end of the phase-locked loop circuit is connected with the output end of the oscillation circuit, the output end of the phase-locked loop circuit is connected with the input end of the amplification circuit. The output end of the amplification circuit is connected with the input end of the switching conversion circuit. The phase-locked loop circuit is configured to convert the first pulse signal into an initial first voltage quantity signal and convert the second pulse signal into an initial second voltage quantity signal. The amplification circuit is configured to amplify the initial first voltage quantity signal and output the first voltage quantity signal, and amplify the initial second voltage quantity signal and output the second voltage quantity signal.

7. A pan detection circuit according to any of claims 3 to 6, wherein, The detection circuit further comprises a signal processing circuit. The signal processing circuit is connected to the output end of the signal conversion circuit and the input end of the switch conversion circuit. The signal processing circuit is configured to amplify and / or shape the signal output by the signal processing circuit and output the amplified and / or shaped signal to the switch conversion circuit.

8. The pan detection circuit of claim 2, wherein, The first switch quantity signal is a high-level signal, and the second switch quantity signal is a low-level signal.

9. A cooking appliance characterized by, The pot detection circuit comprises: The pot detection circuit according to any one of claims 1-8; The pot detection circuit further comprises a panel, and the inductive electrode is arranged on the lower side of the panel. The pot detection circuit further comprises a heater arranged on the lower side of the panel and configured to be controlled by the pot detection circuit to operate.

10. A heating control method characterized by, The cooking appliance according to claim 9, wherein: When the pot detection circuit detects that the pot is placed on the panel, the heater of the cooking appliance is controlled to heat the pot.

11. The method of claim 10, wherein, The method further comprises: When the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in a non-operating state, the heater is controlled not to operate; When the pot detection circuit detects that the pot is not placed on the panel, if the cooking appliance is in an operating state, the heater is controlled to stop operating.

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