Cookware detection circuit of electric ceramic cooker, control method, control circuit and electric ceramic cooker

Abstract

The invention provides a cookware detection circuit of an electric ceramic cooker, a control method, a control circuit and the electric ceramic cooker. The cookware detection circuit comprises an oscillating circuit, a rectifying and filtering circuit and a controller, the oscillating circuit is connected with the rectifying and filtering circuit; the rectifying and filtering circuit is connected with the controller; the oscillating circuit is used for generating oscillation and outputting an alternating current signal under the condition that no cookware is placed on the electric ceramic cooker, or stopping oscillation under the condition that the cookware is placed on the electric ceramic cooker; the rectifying and filtering circuit is used for converting an alternating current signal into a first level signal under the condition that the oscillating circuit oscillates, or outputting a second level signal under the condition that the oscillating circuit stops oscillating; and the controller is used for determining that no cookware is placed on the electric ceramic cooker based on the first level signal, or determining that the cookware is placed on the electric ceramic cooker based on the second level signal. According to the circuit, under the conditions that other objects are mistakenly placed on the electric ceramic cooker or force is manually applied, the situation that the cookware is mistakenly detected to be placed on the electric ceramic cooker is avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of household appliance technology, and more particularly to a pot detection circuit, a control method, a control circuit and an electric ceramic stove. Background Art

[0002] An electric ceramic stove is a kitchen appliance that uses electrical energy to heat the pot by generating high temperatures through electric heating elements and transferring heat through a ceramic glass panel.

[0003] In the related art, a gravity sensor configured on the ceramic stove is used to detect whether a pot is placed on the ceramic stove. In this manner, if other objects are placed on the ceramic stove by mistake, or if a gravity sensor detects weight due to human force, the pot is mistakenly detected to be placed on the ceramic stove. Summary of the invention

[0004] The embodiments of the present application provide a pot detection circuit, a control method, a control circuit and an electric ceramic stove for an electric ceramic stove to solve the problem of erroneous detection of a pot placed on the electric ceramic stove due to other objects being placed on the electric ceramic stove by mistake or due to human force.

[0005] In a first aspect, the present application provides a pot detection circuit for an electric ceramic stove, comprising: an oscillating circuit, a rectifying and filtering circuit, and a controller; the oscillating circuit is connected to the rectifying and filtering circuit, and the rectifying and filtering circuit is connected to the controller;

[0006] The oscillation circuit is used to generate oscillation and output an AC signal when no pot is placed on the electric ceramic stove, or to stop oscillation when a pot is placed on the electric ceramic stove;

[0007] The rectifying and filtering circuit is used to convert the AC signal into a first level signal when the oscillation circuit is oscillating, or output a second level signal when the oscillation circuit stops oscillating;

[0008] The controller is used to determine that no pot is placed on the electric ceramic stove based on the first level signal, or to determine that a pot is placed on the electric ceramic stove based on the second level signal.

[0009] In the pot detection circuit of the electric ceramic stove, when no pot is placed on the electric ceramic stove, the oscillation circuit generates oscillation and outputs an AC signal, the rectifier and filter circuit converts the AC signal into a first level signal, and the controller is used to determine that no pot is placed on the electric ceramic stove based on the first level signal. In the case where a pot is placed on the electric ceramic stove, the metal pot generates an induced magnetic field, causing the oscillation circuit to stop oscillating, the rectifier and filter circuit outputs a second level signal, and the controller determines that a pot is placed on the electric ceramic stove based on the second level signal. The pot detection circuit of the electric ceramic stove of the present application detects whether a pot is placed on the electric ceramic stove based on the influence of the metal pot on the oscillation circuit, and avoids the situation where a pot is placed on the electric ceramic stove in error when other objects are placed on the electric ceramic stove by mistake, or when human force is applied.

[0010] Optionally, the pot detection circuit further comprises: an amplifier circuit; the rectifier and filter circuit is connected to the controller via the amplifier circuit;

[0011] The amplifier circuit is used to amplify the output signal of the rectifier and filter circuit and then output it to the controller.

[0012] The pot detection circuit of the electric ceramic stove includes the amplifier circuit, which can enhance the signal and provide reliable signal transmission.

[0013] Optionally, the oscillation circuit includes a frequency selection circuit, a feedback circuit, a voltage divider circuit and a first switch tube Q1; the feedback circuit is connected between the first end and the second end of the first switch tube Q1, the first end of the frequency selection circuit is connected to a power supply, and the second end of the frequency selection circuit is connected to a third end of the first switch tube; the second end of the first switch tube is connected to the rectifier and filter circuit; the voltage divider circuit is connected between the power supply and a ground point, and the voltage divider circuit is connected to the feedback circuit;

[0014] The frequency selection circuit is used to generate oscillation when no pot is placed on the electric ceramic stove so that the first switch tube outputs the AC signal, or to stop oscillation when a pot is placed on the electric ceramic stove so that the first switch tube is turned off;

[0015] The feedback circuit is used to maintain the oscillation of the frequency selection circuit when no pot is placed on the electric ceramic stove, or to stop the oscillation of the frequency selection circuit when a pot is placed on the electric ceramic stove.

[0016] Optionally, the voltage divider circuit includes a first resistor R1 and a second resistor R2; the feedback circuit includes a first capacitor C1, a second capacitor C2, a first inductor L1 and a third resistor R3; the frequency selection circuit includes a second inductor L2 and a third capacitor C3;

[0017] The first end of the first resistor R1 is connected to the power supply, the second end of the first resistor R1 is connected to the first end of the first inductor L1; the second end of the first inductor L1 is connected to the first end of the first switch tube Q1;

[0018] The first end of the second resistor R2, the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third resistor R3 are grounded respectively, the second end of the second resistor R2 and the second end of the first capacitor C1 are connected to the first end of the first inductor L1 respectively, and the second end of the second capacitor C2 and the second end of the third resistor R3 are connected to the second end of the first switch tube Q1 respectively;

[0019] The first end of the second inductor L2 and the first end of the third capacitor C3 are respectively connected to the power supply, and the second end of the second inductor L2 and the second end of the third capacitor C3 are respectively connected to the third end of the first switch tube Q1.

[0020] Optionally, the rectification and filtering circuit includes a fourth resistor R4, a fifth resistor R5, a third inductor L3, a first diode D1, and a fourth capacitor C4;

[0021] The first end of the fourth resistor R4 is connected to the output end of the oscillation circuit, the second end of the fourth resistor R4 is connected to the first end of the first diode D1 and the first end of the third inductor L3 respectively; the second end of the third inductor L3 is grounded;

[0022] The second end of the first diode D1 is respectively connected to the first end of the fourth capacitor C4 and the first end of the fifth resistor R5, and the second end of the fourth capacitor C4 and the second end of the fifth resistor R5 are respectively grounded;

[0023] A first end of the fourth capacitor C4 and a first end of the fifth resistor R5 are connected to the control circuit respectively.

[0024] Optionally, the amplifying circuit includes a second switch tube Q2, a third switch tube Q3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a voltage regulator tube DZ1, a fifth capacitor C5 and a second diode D2;

[0025] A first end of the second switch tube Q2 is connected to the rectifier filter circuit, a second end of the second switch tube Q2 is grounded, and a third end of the second switch tube Q2 is connected to a first end of the seventh resistor R7;

[0026] The first end of the sixth resistor R6 is connected to the power supply, and the second end of the sixth resistor R6 is connected to the first end of the voltage regulator tube DZ1;

[0027] The second end of the seventh resistor R7 is connected to the second end of the voltage regulator tube DZ1 and the first end of the third switch tube Q3 respectively;

[0028] The first end of the eighth resistor R8 is grounded, the second end of the eighth resistor R8 is connected to the first end of the third switch tube Q3; the second end of the third switch tube Q3 is grounded;

[0029] The first end of the ninth resistor R9, the first end of the fifth capacitor C5, and the first end of the second diode D2 are respectively connected to the third end of the third switch tube Q3; the third end of the third switch tube Q3 is connected to the control circuit, and the second end of the ninth resistor R9, the second end of the capacitor C5, and the second end of the second diode D2 are respectively connected to the power supply.

[0030] In a second aspect, the present application provides a control method for an electric ceramic stove, applied to the pot detection circuit as described in any one of the first aspects, comprising:

[0031] When the electric ceramic stove is in a standby state, if the controller determines that a pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an available state;

[0032] In response to the heating instruction, the electric ceramic stove is controlled to heat.

[0033] Optionally, the control method of the electric ceramic stove further includes:

[0034] When the electric ceramic stove is in a heating state, if the controller determines that no pot is placed on the electric ceramic stove, the controller controls the electric ceramic stove to stop heating and sets the heating function of the electric ceramic stove to an unavailable state.

[0035] The control method of the electric ceramic stove controls the electric ceramic stove to stop heating and sets the heating function of the electric ceramic stove to an unavailable state when detecting that no pot is placed on the electric ceramic stove. This prevents the electric ceramic stove from continuously heating when no pot is placed, reduces equipment loss and avoids accidents.

[0036] In a third aspect, the present application provides a control circuit for an electric ceramic stove, comprising: a pot detection circuit as described in any one of the first aspects.

[0037] The control circuit of the electric ceramic stove detects whether a pot is placed on the electric ceramic stove and controls the heating function of the electric ceramic stove, thereby preventing the electric ceramic stove from continuously heating when no pot is placed, reducing equipment loss and avoiding accidents.

[0038] In a fourth aspect, the present application provides an electric ceramic stove, comprising: the pot detection circuit as described in any one of the first aspects or the control circuit of the electric ceramic stove as described in any one of the third aspects.

[0039] The electric ceramic stove can detect whether a pot is placed on the electric ceramic stove. When it is detected that a pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an available state. When it is detected that no pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an unavailable state. The use safety of the electric ceramic stove is improved.

[0040] The pot detection circuit, control method, control circuit and pot detection circuit of the electric ceramic stove provided in this embodiment include an oscillation circuit, a rectifier filter circuit and a controller. The oscillation circuit is connected to the rectifier filter circuit, and the rectifier filter circuit is connected to the controller. When no pot is placed on the electric ceramic stove, the oscillation circuit generates oscillation and outputs an AC signal, and the rectifier filter circuit converts the AC signal into a first level signal, and the controller is used to determine that no pot is placed on the electric ceramic stove based on the first level signal. When a pot is placed on the electric ceramic stove, the metal pot generates an induced magnetic field, causing the oscillation circuit to stop oscillating, and the rectifier filter circuit outputs a second level signal, and the controller determines that a pot is placed on the electric ceramic stove based on the second level signal. The pot detection circuit of the electric ceramic stove of the present application detects whether a pot is placed on the electric ceramic stove based on the influence of the metal pot on the oscillation circuit, and avoids the situation where a pot is placed on the electric ceramic stove in error when other objects are placed on the electric ceramic stove by mistake, or when human force is applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] Figure 1 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 1 ;

[0043] Figure 2 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 2 ;

[0044] Figure 3 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 3 ;

[0045] Figure 4 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 4 ;

[0046] Figure 5 Schematic diagram of the control method of the electric ceramic stove provided in this application Figure 1 ;

[0047] Figure 6 Schematic diagram of the control method of the electric ceramic stove provided in this application Figure 2 ;

[0048] Figure 7 This is a schematic diagram of the structure of the electric ceramic stove provided in this application. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] The electric ceramic stove is an appliance that generates high temperature through electric heating elements and transfers heat through a ceramic glass panel to heat the pot. The electric ceramic stove can reduce equipment loss and avoid accidents by detecting whether the pot is placed on the panel and controlling the heating method of the electric ceramic stove.

[0051] In the related art, a gravity sensor is usually used to detect whether a pot is placed on the electric ceramic stove. If other objects are placed on the electric ceramic stove by mistake, or if a force is applied manually to cause the gravity sensor to detect weight, it will lead to an erroneous detection of a pot being placed on the electric ceramic stove.

[0052] In order to solve the above problems, the present application proposes a pot detection circuit for an electric ceramic stove, including an oscillating circuit, a rectifying and filtering circuit, and a controller. The oscillating circuit is connected to the rectifying and filtering circuit, and the rectifying and filtering circuit is connected to the controller. When no pot is placed on the electric ceramic stove, the oscillating circuit generates oscillation and outputs an AC signal, and the rectifying and filtering circuit converts the AC signal into a first level signal, and the controller is used to determine that no pot is placed on the electric ceramic stove based on the first level signal. When a pot is placed on the electric ceramic stove, the metal pot generates an induced magnetic field, causing the oscillating circuit to stop oscillating, and the rectifying and filtering circuit outputs a second level signal, and the controller determines that a pot is placed on the electric ceramic stove based on the second level signal. The pot detection circuit of the electric ceramic stove of the present application detects whether a pot is placed on the electric ceramic stove based on the influence of the metal pot on the oscillating circuit. Compared with the method of detecting by a weight sensor, the pot detection circuit of the electric ceramic stove of the present application avoids the situation where a pot is placed on the electric ceramic stove when other objects are placed on the electric ceramic stove by mistake, or when human force is applied.

[0053] The circuit improvement proposed in this application is described below in conjunction with specific embodiments.

[0054] Figure 1 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 1 .like Figure 1 As shown, the pot detection circuit of the electric ceramic stove includes an oscillating circuit 101, a rectifying and filtering circuit 102, and a controller 103. The oscillating circuit 101 is connected to the rectifying and filtering circuit 102, and the rectifying and filtering circuit 102 is connected to the controller 103.

[0055] The oscillation circuit 101 is used to generate oscillation and output an AC signal when no cookware is placed on the ceramic stove, or to stop oscillation when a cookware is placed on the ceramic stove.

[0056] The oscillation circuit 101 is a circuit that can generate oscillations and output AC signals. For example, the oscillation circuit 101 may include an LC sine wave oscillation circuit. The LC sine wave oscillation circuit is a circuit that generates an oscillation signal by combining an inductor coil and a capacitor, and is used to generate a high-frequency sine wave signal. For example, it may be a transformer feedback LC oscillation circuit, an inductor three-point LC oscillation circuit, and a capacitor three-point LC oscillation circuit.

[0057] In this implementation, when no pot is placed on the electric ceramic stove, the oscillation circuit 101 generates oscillations and outputs an AC signal. When a metal object enters the alternating electromagnetic field generated by the coil, eddy currents, i.e., induced currents, are generated inside the metal. The eddy currents generate a reverse magnetic field, which partially offsets the electromagnetic field generated by the coil, and the energy loss in the oscillation circuit 101 increases, and the amplitude of the oscillation signal decreases until the oscillation stops.

[0058] The rectifier and filter circuit 102 is used to convert the AC signal into a first level signal when the oscillator circuit 101 is oscillating, or to output a second level signal when the oscillator circuit 101 stops oscillating.

[0059] The first level signal and the second level signal are used to represent voltage values ​​of different states or information. For example, the first level signal is a high level, and the second level signal is a low level.

[0060] The rectifier and filter circuit can rectify the input AC signal into a DC signal, smooth the rectified DC signal, and output a stable DC signal.

[0061] The rectifying and filtering circuit 102 may include, for example, a rectifying diode, which is a semiconductor device used to convert alternating current into direct current.

[0062] The rectifier filter circuit 102 may include, for example, a capacitor for filtering, and utilizes the charge and discharge characteristics of the capacitor to smooth the DC signal. In a possible implementation, the rectifier filter circuit 102 may include an RC filter circuit, that is, a resistor is connected in series with the rectifier output end, and a capacitor is connected in parallel. The impedance characteristics of the resistor and the capacitor are different at different frequencies, so the RC filter circuit can selectively pass or attenuate signals of specific frequencies.

[0063] The controller 103 is configured to determine that no pot is placed on the electric ceramic stove based on the first level signal, or to determine that a pot is placed on the electric ceramic stove based on the second level signal.

[0064] based on Figure 1 In the pot detection circuit of the electric ceramic stove shown in the figure, when the pot detection circuit of the electric ceramic stove is powered on and no pot is placed on the electric ceramic stove, the oscillation circuit 101 starts to oscillate, generates oscillation and outputs an AC signal, the rectifier and filter circuit 102 rectifies and filters the AC signal and outputs a first level signal, and the controller 103 determines that no pot is placed on the electric ceramic stove based on the first level signal.

[0065] When a pot is placed on the electric ceramic stove, the oscillation circuit 101 stops oscillating due to the eddy current generated by the metal pot, the rectifier filter circuit 102 outputs a second level signal, and the controller 103 determines that a pot is placed on the electric ceramic stove based on the second level signal.

[0066] The pot detection circuit of the electric ceramic stove provided in this embodiment includes an oscillation circuit 101, a rectifier filter circuit 102 and a controller 103. The oscillation circuit 101 is connected to the rectifier filter circuit 102, and the rectifier filter circuit 102 is connected to the controller 103. When no pot is placed on the electric ceramic stove, the oscillation circuit 101 generates oscillation and outputs an AC signal, the rectifier filter circuit 102 converts the AC signal into a first level signal, and the controller 103 is used to determine that no pot is placed on the electric ceramic stove based on the first level signal. When a pot is placed on the electric ceramic stove, the metal pot generates an induced magnetic field, causing the oscillation circuit 101 to stop oscillating, the rectifier filter circuit 102 outputs a second level signal, and the controller 103 determines that a pot is placed on the electric ceramic stove based on the second level signal. The pot detection circuit of the electric ceramic stove of the present application detects whether a pot is placed on the electric ceramic stove based on the influence of the metal pot on the oscillation circuit 101, which improves the accuracy of detection compared to the method of detecting by a weight sensor.

[0067] exist Figure 1 Based on the pot detection circuit of the electric ceramic stove, the pot detection circuit of the electric ceramic stove further includes an amplifier circuit 201.

[0068] Figure 2 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 2 .like Figure 2 As shown, the rectifying and filtering circuit 102 is connected to the controller 103 via the amplifying circuit 201 .

[0069] The amplifier circuit 201 is used to amplify the output signal of the rectifier filter circuit 102 and output it to the controller 103. The amplifier circuit 201 is a circuit that can enhance the input signal. For example, the amplifier circuit 201 can be designed based on a common emitter amplifier, which can amplify weak signals, change the forward voltage between the base and emitter of the transistor, and make the collector reversely biased through the control of the transistor, so that the transistor plays an amplifying role.

[0070] Figure 3 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 3 .

[0071] like Figure 3 As shown, the oscillation circuit 101 includes a frequency selection circuit 301, a feedback circuit 302, a voltage divider circuit 303 and a first switch tube Q1.

[0072] The feedback circuit 302 is connected between the first end and the second end of the first switch tube Q1, the first end of the frequency selection circuit 301 is connected to the power supply, and the second end of the frequency selection circuit 301 is connected to the third end of the first switch tube. The second end of the first switch tube is connected to the rectifier filter circuit 102. The voltage divider circuit 303 is connected between the power supply and the ground point, and the voltage divider circuit 303 is connected to the feedback circuit 302.

[0073] The frequency selection circuit 301 is used to generate oscillation when no pot is placed on the electric ceramic stove, so that the first switch tube outputs an AC signal, or to stop oscillation when a pot is placed on the electric ceramic stove to turn off the first switch tube. The frequency selection circuit 301 can be composed of an inductor and a capacitor, for example. In this way, the frequency selection circuit 301 can use the resonance characteristics of the inductor and the capacitor to select a specific frequency for oscillation.

[0074] The feedback circuit 302 is used to maintain the oscillation of the frequency selection circuit 301 when no pot is placed on the electric ceramic stove, or to stop the oscillation of the frequency selection circuit 301 when a pot is placed on the electric ceramic stove. For example, the feedback circuit 302 can provide a feedback signal through an inductor element to maintain the oscillation.

[0075] Since the frequency selection circuit 301 has energy loss during oscillation and cannot maintain stable oscillation, the first switch tube Q1 compensates for the energy loss by amplifying the feedback signal and provides phase shift to maintain stable oscillation. The first switch tube Q1 is any component that can achieve amplification and phase shift, such as an NPN transistor, a PNP transistor, etc.

[0076] The voltage divider circuit 303 and the feedback circuit 302 can provide a stable voltage for the first switch Q1, so that the first switch Q1 can operate within an accurate current and voltage range.

[0077] The pot detection circuit of the electric ceramic stove in the embodiment of the present application is described below by using a specific example. Figure 4 The structure of the pot detection circuit of the electric ceramic stove provided in this application is shown as follows Figure 4 .

[0078] like Figure 4 As shown, the oscillator circuit 101 includes a frequency selection circuit 301, a feedback circuit 302, a voltage divider circuit 303 and a first switch tube Q1. The first switch tube Q1 is an NPN transistor as an example.

[0079] The voltage divider circuit 303 includes a first resistor R1 and a second resistor R2. The feedback circuit 302 includes a first capacitor C1, a second capacitor C2, a first inductor L1 and a third resistor R3. The frequency selection circuit 301 includes a second inductor L2 and a third capacitor C3.

[0080] The first end of the first resistor R1 is connected to the power supply, the second end of the first resistor R1 is connected to the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the first end of the first switch tube Q1.

[0081] The first end of the second resistor R2, the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third resistor R3 are grounded respectively, the second end of the second resistor R2 and the second end of the first capacitor C1 are connected to the first end of the first inductor L1 respectively, and the second end of the second capacitor C2 and the second end of the third resistor R3 are connected to the second end of the first switch tube Q1 respectively.

[0082] The first end of the second inductor L2 and the first end of the third capacitor C3 are respectively connected to the power supply, and the second end of the second inductor L2 and the second end of the third capacitor C3 are respectively connected to the third end of the first switch tube Q1.

[0083] When no pot is placed on the electric ceramic stove, when the third capacitor C3 in the frequency selection circuit 301 is discharged, the current passes through the second inductor L2, and the second inductor L2 stores magnetic energy. Afterwards, the magnetic energy of the second inductor L2 is converted into electrical energy, and the third capacitor C3 stores electrical energy. In the energy conversion between the second inductor L2 and the third capacitor C3, the frequency selection circuit 301 forms an oscillation. The first switch tube Q1 compensates for energy loss by amplifying the feedback signal and provides a phase shift. In combination with the voltage division effect of the first resistor R1 and the second resistor R2, the first capacitor C1 and the second resistor R2, the second capacitor C2 and the third resistor R3, and the filtering effect of the second inductor L2, the oscillation circuit 101 maintains a stable oscillation and outputs a high-frequency AC signal through the second end of the first switch tube Q1.

[0084] The rectifying and filtering circuit 102 includes a fourth resistor R4, a fifth resistor R5, a third inductor L3, a first diode D1, and a fourth capacitor C4.

[0085] A first end of the fourth resistor R4 is connected to the output end of the oscillation circuit 101 , a second end of the fourth resistor R4 is connected to a first end of the first diode D1 and a first end of the third inductor L3 respectively; a second end of the third inductor L3 is grounded.

[0086] The second end of the first diode D1 is connected to the first end of the fourth capacitor C4 and the first end of the fifth resistor R5 respectively, and the second end of the fourth capacitor C4 and the second end of the fifth resistor R5 are grounded respectively.

[0087] A first end of the fourth capacitor C4 and a first end of the fifth resistor R5 are connected to the control circuit respectively.

[0088] The second diode Q2 is used to realize the on-off of the circuit based on different voltages, and to enhance the signal by controlling the magnitude of the input signal. The second diode Q2 can be any component that can control the on-off of the signal and can amplify the signal. Figure 4 In the example, the second diode Q2 is an NPN transistor.

[0089] When a high-frequency AC signal is output at the second end of the first switch tube Q1, the first diode D1 in the rectifier and filter circuit 102 converts the AC signal into a DC signal, and based on the filtering effect of the third inductor L3, the fourth capacitor C4, and the fifth resistor R5, the rectifier and filter circuit 102 outputs a stable DC signal.

[0090] The amplifier circuit 201 includes a second switch tube Q2, a third switch tube Q3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a voltage regulator tube DZ1, a fifth capacitor C5 and a second diode D2.

[0091] A first end of the second switch tube Q2 is connected to the rectifying and filtering circuit 102 , a second end of the second switch tube Q2 is grounded, and a third end of the second switch tube Q2 is connected to a first end of the seventh resistor R7 .

[0092] A first end of the sixth resistor R6 is connected to a power source, and a second end of the sixth resistor R6 is connected to a first end of the voltage regulator tube DZ1.

[0093] The second end of the seventh resistor R7 is connected to the second end of the voltage regulator tube DZ1 and the first end of the third switch tube Q3 respectively.

[0094] A first end of the eighth resistor R8 is grounded, a second end of the eighth resistor R8 is connected to a first end of the third switch tube Q3 ; and a second end of the third switch tube Q3 is grounded.

[0095] The first end of the ninth resistor R9, the first end of the fifth capacitor C5, and the first end of the second diode D2 are respectively connected to the third end of the third switch tube Q3. The third end of the third switch tube Q3 is connected to the control circuit, and the second end of the ninth resistor R9, the second end of the capacitor C5, and the second end of the second diode D2 are respectively connected to the power supply.

[0096] The third switch tube Q3 is used to realize the on-off of the circuit based on different voltages. The third switch tube Q3 can be any component that can control the on-off of a signal. Figure 4In the example, the third switch tube Q3 is an NPN transistor. The voltage regulator tube DZ1 is used to stabilize the voltage in the circuit to remain basically unchanged when the voltage in the circuit changes. The second diode D2 is used to control the unidirectional transmission of the signal, and is combined with the fifth capacitor C5 and the ninth resistor R9 to realize the output of the third terminal of the third switch tube Q3, so that the output terminal of the amplifier circuit 201 outputs the first level signal or the second level signal.

[0097] based on Figure 4 In the pot detection circuit of the electric ceramic stove shown, when no pot is placed on the electric ceramic stove, the frequency selection circuit 301 in the oscillation circuit 101 starts to oscillate, and through the action of the feedback circuit 302, the voltage divider circuit 303 and the first switch tube Q1, a stable oscillation is maintained, and a high-frequency AC signal is output through the first switch Q1.

[0098] The AC signal is input into the rectification and filtering circuit 102 through the fourth resistor R4, rectified by the first diode D1, and frequency selected and filtered by a circuit composed of the third inductor L3, the first end of the fourth capacitor C4 and the fifth resistor R5, so as to convert the AC signal into a stable DC signal, and output the DC signal to the amplifier circuit 201.

[0099] In the current state, the first end of the second switch tube Q2 in the amplifier circuit 201, that is, the base end of the second switch tube Q2 is at a high level, the second switch tube Q2 is in a saturated conduction state, and the third end of the second switch tube Q2, that is, the collector potential of the second switch tube Q2 is reduced, resulting in a reduction in the potential of the first end of the third switch tube Q3, and the third switch tube Q3 is in a cut-off state. Therefore, the third end of the third switch tube Q3 is at a high potential, that is, the amplifier circuit 201 outputs a high level, and the current first level signal is a high level. The first level signal is input to the controller 103, and the controller 103 determines that no pot is placed on the electric ceramic stove based on the first level signal.

[0100] When a pot is placed on the electric ceramic stove, the metal pot generates an induced magnetic field, causing the oscillation circuit 101 to stop oscillating. In the current state, the voltage of the first coil L1 in the oscillation circuit 101 decreases, the first switch tube Q1 is turned off, and the oscillation circuit 101 has no signal output.

[0101] In the current state, the first end of the second switch tube Q2 in the amplifier circuit 201 is at a low level, the second switch tube Q2 is in a cut-off state, the potential of the third end of the second switch tube Q2 increases, the potential of the first end of the third switch tube Q3 increases, and the third switch tube Q3 is in a saturated conduction state. Therefore, the third end of the third switch tube Q3 is at a low potential, that is, the amplifier circuit 201 outputs a low level, and the current second level signal is a low level. The second level signal is input to the controller 103, and the controller 103 determines that no pot is placed on the electric ceramic stove based on the second level signal.

[0102] The pot detection circuit of the electric ceramic stove provided in this embodiment includes an oscillation circuit 101, a rectifier filter circuit 102 and a controller 103. The oscillation circuit 101 is connected to the rectifier filter circuit 102, and the rectifier filter circuit 102 is connected to the controller 103. When no pot is placed on the electric ceramic stove, the oscillation circuit 101 generates oscillation and outputs an AC signal, the rectifier filter circuit 102 converts the AC signal into a first level signal, and the controller 103 is used to determine that no pot is placed on the electric ceramic stove based on the first level signal. When a pot is placed on the electric ceramic stove, the metal pot generates an induced magnetic field, causing the oscillation circuit 101 to stop oscillating, the rectifier filter circuit 102 outputs a second level signal, and the controller 103 determines that a pot is placed on the electric ceramic stove based on the second level signal. The pot detection circuit of the electric ceramic stove of the present application detects whether a pot is placed on the electric ceramic stove based on the influence of the metal pot on the oscillation circuit 101. Compared with the detection method through the weight sensor, the pot detection circuit of the electric ceramic stove of the present application can avoid the situation where the pot is placed on the electric ceramic stove by mistake when other objects are placed on the electric ceramic stove by mistake or when human force is applied.

[0103] The present application also provides a control method for an electric ceramic stove, which is applied to the pot detection circuit of the electric ceramic stove.

[0104] When the electric ceramic stove is in the standby state, if the controller 103 determines that a pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an available state. The standby state is a state where the electric ceramic stove is powered on and not heated. If the heating function of the electric ceramic stove is set to an available state, the electric ceramic stove can be controlled to heat after receiving a heating instruction. Conversely, if the heating function of the electric ceramic stove is set to an unavailable state, in this state, after receiving a heating instruction, the heating instruction is not responded to, that is, the electric ceramic stove does not heat.

[0105] In response to the heating instruction, the electric ceramic stove is controlled to heat. The heating instruction is an instruction to instruct the heating element of the electric ceramic stove to heat. The heating instruction can be triggered by a switch configured on the electric ceramic stove, for example. In this way, the user can trigger the switch through the screen of the user interface of the electric ceramic stove, or through a mechanical switch configured on the electric ceramic stove, etc., and this application does not limit this.

[0106] When the electric ceramic stove is in a heating state, if the controller 103 determines that no pot is placed on the electric ceramic stove, the electric ceramic stove is controlled to stop heating and the heating function of the electric ceramic stove is set to an unavailable state. The current state indicates that during the heating process of the electric ceramic stove, it is detected that the pot is removed, so the electric ceramic stove is controlled to stop heating and the heating function of the electric ceramic stove is set to an unavailable state.

[0107] Figure 5 Schematic diagram of the control method of the electric ceramic stove provided in this application Figure 1 .like Figure 5As shown, when the electric ceramic stove is in the standby state, the control method of the electric ceramic stove specifically includes:

[0108] S501: It is detected that a pot is placed on the electric ceramic stove.

[0109] If yes, execute step S503;

[0110] If not, execute step S502.

[0111] S502: Set the heating function of the electric ceramic stove to an unavailable state.

[0112] S503, setting the heating function of the electric ceramic stove to an available state.

[0113] Figure 6 Schematic diagram of the control method of the electric ceramic stove provided in this application Figure 2 .like Figure 6 As shown, when the electric ceramic stove is in a heating state, the control method of the electric ceramic stove specifically includes:

[0114] S601: It is detected that a pot is placed on the electric ceramic stove.

[0115] If yes, execute step S604;

[0116] If not, execute step S602.

[0117] S602, controlling the electric ceramic stove to stop heating.

[0118] S603, setting the heating function of the electric ceramic stove to an unavailable state.

[0119] S604, controlling the electric ceramic stove to continue heating.

[0120] The control method of the electric ceramic stove proposed in the present application controls the electric ceramic stove to stop heating and sets the heating function of the electric ceramic stove to an unavailable state when it is detected that no pot is placed on the electric ceramic stove. The control method of the present application prevents the electric ceramic stove from continuing to heat when no pot is placed, reduces equipment loss and avoids accidents.

[0121] The present application proposes a control circuit of an electric ceramic stove, including the pot detection circuit of the electric ceramic stove. The control circuit of the electric ceramic stove detects whether a pot is placed on the electric ceramic stove and controls the heating function of the electric ceramic stove, thereby preventing the electric ceramic stove from continuously heating when no pot is placed, reducing equipment loss and avoiding accidents.

[0122] The present application provides an electric ceramic stove, including the pot detection circuit of the electric ceramic stove provided in the present application or the control circuit of the electric ceramic stove provided in the present application.

[0123] Figure 7This is a schematic diagram of the structure of the electric ceramic stove provided in this application. Figure 7 As shown, the structure of the electric ceramic stove includes a panel 701, an induction electrode 702, a coil support 703, a support spring 704, a stove plate assembly 705, a stove plate spring 706, and a base 707. The base 707 includes other components of the electric ceramic stove, such as a printed circuit board (PCB) and a fan.

[0124] The coil support 703 is used to place the induction electrode 702, which is the inductance coil of the oscillation circuit 101 in the pot detection circuit of the electric ceramic stove. Figure 4 The first inductor L1 and the second inductor L2 are shown in FIG. The induction electrode 702 is located outside the coil support 703 and can sense the change of the magnetic field. The support spring 704 and the stove spring 706 are used to balance the force and provide stable support. The stove assembly 705 is used to convert electrical energy into thermal energy through a resistance heating element. The panel 701 uses the heat energy generated by the stove assembly 705 to heat the pot through heat conduction. The PCB board in the base 707 is used to realize the pot detection circuit of the electric ceramic stove or the control circuit of the electric ceramic stove, and the fan is used for dust removal and heat dissipation.

[0125] The electric ceramic stove proposed in the present application can detect whether a pot is placed on the electric ceramic stove. When it is detected that a pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an available state. When it is detected that no pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an unavailable state. The electric ceramic stove of the present application improves the safety of the use of the electric ceramic stove.

[0126] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0127] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. 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, disk or optical disk and other media that can store program codes.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the embodiments of the present application.

Claims

1. A pot detection circuit for an electric ceramic stove, characterized in that: include: An oscillating circuit (101), a rectifying and filtering circuit (102) and a controller (103); the oscillating circuit (101) is connected to the rectifying and filtering circuit (102), and the rectifying and filtering circuit (102) is connected to the controller (103); The oscillation circuit (101) is used to generate oscillation and output an AC signal when no pot is placed on the electric ceramic stove, or to stop oscillation when a pot is placed on the electric ceramic stove; The rectifying and filtering circuit (102) is used to convert the AC signal into a first level signal when the oscillation circuit (101) oscillates, or to output a second level signal when the oscillation circuit (101) stops oscillating; The controller (103) is used to determine that no pot is placed on the electric ceramic stove based on the first level signal, or to determine that a pot is placed on the electric ceramic stove based on the second level signal.

2. The cookware detection circuit according to claim 1, characterized in that: Also includes: Amplifying circuit (201); the rectifying and filtering circuit (102) is connected to the controller (103) via the amplifying circuit (201); The amplifier circuit (201) is used to amplify the output signal of the rectification and filtering circuit (102) and output the amplified signal to the controller (103).

3. The cookware detection circuit according to claim 1, characterized in that: The oscillation circuit (101) comprises a frequency selection circuit (301), a feedback circuit (302), a voltage divider circuit (303) and a first switch tube Q1; the feedback circuit (302) is connected between a first end and a second end of the first switch tube Q1, the first end of the frequency selection circuit (301) is connected to a power source, and the second end of the frequency selection circuit (301) is connected to a third end of the first switch tube; the second end of the first switch tube is connected to the rectifier filter circuit (102); the voltage divider circuit (303) is connected between the power source and a ground point, and the voltage divider circuit (303) is connected to the feedback circuit (302); The frequency selection circuit (301) is used to generate oscillation when no pot is placed on the electric ceramic stove so that the first switch tube outputs the AC signal, or to stop oscillation when a pot is placed on the electric ceramic stove so that the first switch tube is turned off; The feedback circuit (302) is used to maintain the oscillation of the frequency selection circuit (301) when no pot is placed on the electric ceramic stove, or to stop the oscillation of the frequency selection circuit (301) when a pot is placed on the electric ceramic stove.

4. The pot detection circuit according to claim 3, characterized in that: The voltage divider circuit (303) comprises a first resistor R1 and a second resistor R2; the feedback circuit (302) comprises a first capacitor C1, a second capacitor C2, a first inductor coil L1 and a third resistor R3; the frequency selection circuit (301) comprises a second inductor coil L2 and a third capacitor C3; The first end of the first resistor R1 is connected to the power supply, the second end of the first resistor R1 is connected to the first end of the first inductor L1; the second end of the first inductor L1 is connected to the first end of the first switch tube Q1; The first end of the second resistor R2, the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third resistor R3 are grounded respectively, the second end of the second resistor R2 and the second end of the first capacitor C1 are connected to the first end of the first inductor L1 respectively, and the second end of the second capacitor C2 and the second end of the third resistor R3 are connected to the second end of the first switch tube Q1 respectively; The first end of the second inductor L2 and the first end of the third capacitor C3 are respectively connected to the power supply, and the second end of the second inductor L2 and the second end of the third capacitor C3 are respectively connected to the third end of the first switch tube Q1.

5. The cookware detection circuit according to claim 1, characterized in that: The rectification and filtering circuit (102) comprises a fourth resistor R4, a fifth resistor R5, a third inductor L3, a first diode D1, and a fourth capacitor C4; The first end of the fourth resistor R4 is connected to the output end of the oscillation circuit (101), the second end of the fourth resistor R4 is connected to the first end of the first diode D1 and the first end of the third inductor L3 respectively; the second end of the third inductor L3 is grounded; The second end of the first diode D1 is respectively connected to the first end of the fourth capacitor C4 and the first end of the fifth resistor R5, and the second end of the fourth capacitor C4 and the second end of the fifth resistor R5 are respectively grounded; The first end of the fourth capacitor C4 and the first end of the fifth resistor R5 are connected to the control circuit respectively.

6. The cookware detection circuit according to claim 2, characterized in that: The amplifier circuit (201) comprises a second switch tube Q2, a third switch tube Q3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a voltage regulator tube DZ1, a fifth capacitor C5 and a second diode D2; The first end of the second switch tube Q2 is connected to the rectifier filter circuit (102), the second end of the second switch tube Q2 is grounded, and the third end of the second switch tube Q2 is connected to the first end of the seventh resistor R7; The first end of the sixth resistor R6 is connected to the power supply, and the second end of the sixth resistor R6 is connected to the first end of the voltage regulator tube DZ1; The second end of the seventh resistor R7 is connected to the second end of the voltage regulator tube DZ1 and the first end of the third switch tube Q3 respectively; The first end of the eighth resistor R8 is grounded, the second end of the eighth resistor R8 is connected to the first end of the third switch tube Q3; the second end of the third switch tube Q3 is grounded; The first end of the ninth resistor R9, the first end of the fifth capacitor C5, and the first end of the second diode D2 are respectively connected to the third end of the third switch tube Q3; the third end of the third switch tube Q3 is connected to the control circuit, and the second end of the ninth resistor R9, the second end of the capacitor C5, and the second end of the second diode D2 are respectively connected to the power supply.

7. A control method for an electric ceramic stove, applied to the pot detection circuit according to any one of claims 1 to 6, the method comprising: When the electric ceramic stove is in a standby state, if the controller (103) determines that a pot is placed on the electric ceramic stove, the heating function of the electric ceramic stove is set to an available state; In response to the heating instruction, the electric ceramic stove is controlled to heat.

8. The method according to claim 7, characterized in that Also includes: When the electric ceramic stove is in a heating state, if the controller (103) determines that no pot is placed on the electric ceramic stove, the controller (103) controls the electric ceramic stove to stop heating and sets the heating function of the electric ceramic stove to an unavailable state.

9. A control circuit for an electric ceramic stove, characterized in that: include: A cookware detection circuit as claimed in any one of claims 1 to 6.

10. An electric ceramic stove, characterized in that: include: The cookware detection circuit according to any one of claims 1 to 6 or the control circuit according to claim 9.

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