Anti-overflow method and device for electric cooker and electric cooker

Abstract

The invention relates to an anti-overflow method and device for an electric cooker and the electric cooker. In the method, the electric cooker works in stages, the electric cooker works periodically in each stage, each period comprises working duration and stopping duration, and the periods of different stages are different; in the third stage, the inner pot of the electric cooker vibrates, so that bubbles in the inner pot of the electric cooker are broken; wherein the third stage is a stage after the top temperature of the inner pot of the electric cooker reaches a second preset temperature. According to the invention, the temperature of the inner pot can be more uniform, and the risk of overflow can be reduced.

Description

Technical Field

[0001] The invention relates to the field of household appliances, and in particular to an electric rice cooker overflow prevention method, device and electric rice cooker. Background Art

[0002] The rice cooker is a commonly used kitchen appliance that heats rice to make it fully absorb water and gelatinize starch, thereby achieving the purpose of cooking. The heating control technology of the rice cooker ensures the cooking effect of rice by controlling the heating power and heating time of the rice cooker.

[0003] During the heating process of the rice cooker, the rice is easily cooked unevenly or overflows. In order to solve the problem of long cooking time and uneven cooking, the prior art usually adopts the method of increasing the heating power. However, simply increasing the heating power will make the overflow problem of the rice cooker more serious.

[0004] It can be seen that the method in the prior art is also difficult to solve the overflow problem of the rice cooker while ensuring the cooking effect of the rice cooker. Summary of the invention

[0005] In order to solve the above technical problem or at least partially solve the above technical problem, the present invention provides an electric rice cooker overflow prevention method, device and electric rice cooker.

[0006] In a first aspect, the present invention provides a method for preventing an electric rice cooker from overflowing, the method comprising:

[0007] The rice cooker works in stages, and works periodically in each stage. Each cycle includes working time and stop time, and the cycles in different stages are different;

[0008] In the third stage, the inner pot of the rice cooker vibrates to break the bubbles in the inner pot of the rice cooker;

[0009] Wherein, the third stage is the stage after the top temperature of the inner pot of the rice cooker reaches the second preset temperature.

[0010] Optionally, the electric rice cooker works in stages, and works periodically in each stage, each cycle includes working time and stop time, and the cycles in different stages are different, including:

[0011] After the electric rice cooker is started, it enters a first stage. In the first stage, the working time is a first time, and the stop time is a second time;

[0012] After the top temperature of the inner pot of the electric rice cooker reaches the first preset temperature, the electric rice cooker enters the second stage, in which the working time is the third time and the stop time is the second time;

[0013] When the top temperature of the inner pot of the electric rice cooker reaches the second preset temperature, the electric rice cooker enters the third stage, in which the working time is the fourth time length and the stop time is the fourth time length;

[0014] When the third stage lasts for a preset time, the rice cooker enters a fourth stage, in which the working time is the fifth time, and the stop time is the second time;

[0015] Among them, the first duration is shorter than the second duration, the third duration is shorter than the second duration, the third duration is longer than the first duration, the fourth duration is shorter than the first duration, and the fifth duration is shorter than the first duration.

[0016] Optionally, in the third stage, the inner pot of the electric rice cooker vibrates to break bubbles in the inner pot of the electric rice cooker, comprising:

[0017] The temperature detection circuit detects the top temperature of the inner pot of the rice cooker, and generates a periodic driving signal after the top temperature reaches a second preset temperature;

[0018] The driving circuit generates a periodic pot detection current under the action of the periodic driving signal;

[0019] The resonant circuit generates periodic instantaneous electromagnetic pulses under the periodic pot detection current;

[0020] Wherein, the periodic pot detection current and the periodic instantaneous electromagnetic pulse are used to vibrate the inner pot of the electric rice cooker to burst the bubbles in the inner pot of the electric rice cooker.

[0021] Optionally, the resonant circuit includes:

[0022] An inductor coil connected to the driving circuit and used for receiving the periodic pot detection current;

[0023] a resonant capacitor, a first end of which is connected to the first end of the inductor coil, and a second end of which is connected to the second end of the inductor coil;

[0024] The inductor coil and the resonant capacitor form a resonant circuit, and the resonant circuit is used to generate the periodic instantaneous electromagnetic pulse according to the periodic pot detection current.

[0025] The periodic pot detection current and the periodic instantaneous electromagnetic pulse are also used to heat the food in the inner pot of the electric rice cooker.

[0026] Optionally, the inductor coil includes a bottom coil and a side coil, and the length of the bottom coil is greater than the length of the side coil;

[0027] The bottom coil is a multi-layer wire component, each layer of the wire component is composed of a plurality of turns of wire, the multi-layer wire components are connected in sequence, and the electromagnetic pulses generated by each layer of the wire components are in the same direction.

[0028] Optionally, the inner pot of the rice cooker is a multi-layer composite pot, and the outer layer or the inner layer of the multi-layer composite pot is a magnetic conductor.

[0029] Optionally, the inner pot of the electric rice cooker is a multi-layer composite pot, the outer layer of the multi-layer composite pot is a stainless steel layer, and the inner layer is an aluminum pot body.

[0030] Optionally, the driving circuit includes:

[0031] A first resistor, a first end of which is connected to the temperature detection circuit;

[0032] a second resistor, a second end of which is connected to the first end of the first resistor;

[0033] A first triode, a base of which is connected to the second end of the first resistor and an emitter of which is grounded;

[0034] a third resistor, a first end of which is connected to the base of the first transistor, and a second end of which is grounded;

[0035] A second triode, the base of which is connected to the collector of the first triode, and the collector is grounded;

[0036] A first capacitor, a first end of which is connected to the base of the second transistor, and a second end of which is grounded;

[0037] a fourth resistor, a first end of which is connected to the emitter of the second triode;

[0038] a third triode, the base of which is connected to the base of the second triode;

[0039] a first diode, a cathode connected to the collector of the third triode, and a cathode connected to the emitter of the third triode;

[0040] a fifth resistor, a first end of which is connected to the emitter of the third transistor, and a second end of which is connected to the second end of the fourth resistor;

[0041] a sixth resistor, a first end of which is connected to the first end of the second resistor, and a second end of which is connected to the base of the third transistor;

[0042] a seventh resistor, wherein a first end of the seventh resistor is connected to the collector of the third triode, a first end of the seventh resistor is also connected to the first end of the sixth resistor, and a second end of the seventh resistor is connected to a power supply;

[0043] a second capacitor, a first end of which is grounded, and a second end of which is connected to the first end of the sixth resistor;

[0044] a third capacitor, a positive electrode of which is connected to the first end of the sixth resistor and a negative electrode of which is grounded;

[0045] a voltage stabilizing diode, wherein the cathode is connected to the second end of the fourth resistor and the anode is grounded;

[0046] an eighth resistor, a first end of which is connected to the cathode of the voltage zener diode, and a second end of which is connected to the anode of the voltage zener diode;

[0047] An insulated gate bipolar transistor, wherein the base is connected to the cathode of the voltage zener diode, the emitter is connected to the anode of the voltage zener diode, and the collector is connected to the inductor;

[0048] Wherein, the third capacitor is an electrolytic capacitor.

[0049] In a second aspect, a device for preventing overflow of an electric rice cooker is provided, the device comprising:

[0050] A control unit, used to make the rice cooker work in stages, and work periodically in each stage, each cycle includes working time and stop time, and the cycles in different stages are different;

[0051] an anti-overflow unit, used to vibrate the inner pot of the rice cooker in the third stage to break bubbles in the inner pot of the rice cooker;

[0052] Wherein, the third stage is the stage after the top temperature of the inner pot of the rice cooker reaches the second preset temperature.

[0053] A third aspect provides an electric rice cooker, using the method as described above.

[0054] The present invention relates to an electric rice cooker overflow prevention method, device and electric rice cooker. In the method of the present invention, the electric rice cooker works in stages, and works periodically in each stage. Each cycle includes working time and stop time, and the cycles of different stages are different. In the third stage, the inner pot of the electric rice cooker vibrates to break the bubbles in the inner pot of the electric rice cooker. The third stage is the stage after the top temperature of the inner pot of the electric rice cooker reaches a second preset temperature. In the embodiment of the present invention, the electric rice cooker cooks rice in stages, and adopts a heating and stopping cycle process when working, which can improve the taste of the finished product, reduce the cooking time, make the temperature of the inner pot more uniform, and reduce the risk of overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0057] Figure 1 Shown is a schematic diagram of an electric rice cooker according to an embodiment of the present invention;

[0058] Figure 2 Shown is a flow chart of an electric rice cooker overflow prevention method according to an embodiment of the present invention;

[0059] Figure 3 Shown is a flow chart of an electric rice cooker overflow prevention method according to an embodiment of the present invention;

[0060] Figure 4 FIG. 1 is a schematic structural diagram of a resonant circuit and a driving circuit according to an embodiment of the present invention;

[0061] Figure 5 Shown is a cross-sectional schematic diagram of an electric rice cooker according to an embodiment of the present invention;

[0062] Figure 6 Shown is a schematic structural diagram of an overflow prevention unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] Figure 1 Shown is a schematic diagram of an electric rice cooker according to an embodiment of the present invention, Figure 1 As shown, the electric rice cooker comprises an outer pot 110, an inner pot 120, etc. Usually, the inner pot 120 of the electric rice cooker is separated from the outer pot 110 and can be taken out, that is, there is a certain gap between the inner pot 120 and the outer pot 110 of the electric rice cooker.

[0065] The circuit and the like in the embodiment of the present invention are arranged inside the outer pot 110 .

[0066] The electric rice cooker overflow prevention method of the present invention is applied to Figure 1 The method of the embodiment of the present invention is not limited to Figure 1 The rice cooker shown can also be applied to other household appliances for cooking rice and porridge.

[0067] Figure 2 FIG. 1 is a flow chart of a method for preventing an electric rice cooker from overflowing according to an embodiment of the present invention. Figure 2 As shown, the method includes:

[0068] Step 210, the rice cooker works in stages, and works periodically in each stage. Each cycle includes a working time and a stop time, and the cycles in different stages are different;

[0069] Step 220, in the third stage, the inner pot of the rice cooker vibrates to break bubbles in the inner pot of the rice cooker;

[0070] Wherein, the third stage is the stage after the top temperature of the inner pot of the rice cooker reaches the second preset temperature.

[0071] In the embodiment of the present invention, the second preset temperature may be 100 degrees, or the second preset temperature may be the boiling point of water. Since the boiling point of water is different at different pressures and altitudes, the specific value of the second preset temperature may vary slightly depending on the actual situation.

[0072] Figure 3 FIG. 1 is a flow chart of a method for preventing an electric rice cooker from overflowing according to an embodiment of the present invention. Figure 3 As shown, in step 210, the electric cooker works in stages, and works periodically in each stage. Each cycle includes a working time and a stop time. The cycles in different stages are different, including:

[0073] Step 211, the rice cooker enters the first stage after starting, in which the working time is the first time length and the stop time is the second time length;

[0074] Step 212, after the top temperature of the inner pot of the rice cooker reaches the first preset temperature, the rice cooker enters the second stage, in which the working time is the third time, and the stop time is the second time;

[0075] Step 213, when the top temperature of the inner pot of the rice cooker reaches the second preset temperature, the rice cooker enters the third stage, in which the working time is the fourth time length, and the stop time is the fourth time length;

[0076] Step 214, when the third stage lasts for a preset time, the rice cooker enters a fourth stage, in which the working time is the fifth time, and the stop time is the second time;

[0077] Among them, the first duration is shorter than the second duration, the third duration is shorter than the second duration, the third duration is longer than the first duration, the fourth duration is shorter than the first duration, and the fifth duration is shorter than the first duration.

[0078] In the embodiment of the present invention, the operation of the rice cooker is divided into four stages, and each stage is periodic heating.

[0079] The rice cooker enters the first stage after starting, and usually turns to the second stage when the temperature reaches 60 degrees. In the first stage, it can be heated for 4 seconds, stopped for 16 seconds, and then continued to heat for 4 seconds and stopped for 16 seconds.

[0080] The first stage is the beginning of the cooking process. The heating time is shorter and the stopping time is longer. This allows the ingredients in the rice cooker to be fully immersed in the liquid at a higher temperature, which can improve the taste of the finished product.

[0081] In the second stage, it can be heated for 14 seconds, stopped for 16 seconds, then continued to heat for 14 seconds, and stopped for 16 seconds. In the second stage, after the temperature reaches 80 degrees, it enters the third stage.

[0082] In the second stage, the temperature reaches 80 degrees. In this stage, the heating time is extended, and the liquid can be quickly heated to boiling, reducing the cooking time.

[0083] The third stage has a fixed duration, which can be set according to the power of the rice cooker, the cooking mode, etc., and can usually be set to 6 minutes. In the third stage, the rice cooker is heated from 80 degrees to 100 degrees, and continues to heat at around 100 degrees. During this stage, the liquid boils and a large number of bubbles are generated. In the third stage, it can be heated for 1 second, stopped for 1 second, continued to heat for 1 second, and stopped for one second.

[0084] The quick switching between heating and stopping can make the temperature of the inner pot more uniform, while the alternating heating and stopping can also help control the size of the bubbles in the pot and help reduce overflow.

[0085] The fourth stage may be heating for 3 seconds, stopping for 16 seconds, continuing heating for 3 seconds, and stopping for 16 seconds.

[0086] This stage is when the rice is cooked or nearly cooked. Reducing the heating time during this stage can reduce the risk of overflow from the rice cooker and save energy. Continuous heating during this stage is equivalent to stewing the rice, which can improve the taste of the finished product.

[0087] In fact, in the embodiment of the present invention, after the fourth stage, the rice cooker is no longer heated, but can still be in a keep-warm state, which can also be called a rice-cooking state or the fifth stage, which can improve the taste of the finished product.

[0088] When the rice cooker is working, that is, cooking rice or porridge, water needs to be added. When the temperature of the ingredients in the rice cooker reaches about 100 degrees, the water will produce bubbles due to boiling. These bubbles will drive the solid to form larger bubbles, and these large bubbles are the main reason for the overflow of liquid and solid-liquid mixture inside the rice cooker. Overflow of the rice cooker will lower the temperature inside the pot, waste energy, and increase the difficulty of cleaning the rice cooker.

[0089] In the embodiment of the present invention, the electric rice cooker cooks rice in stages, and adopts a heating and stopping cycle process during operation, which can improve the taste of the finished product, reduce the cooking time, make the temperature of the inner pot more uniform, and reduce the risk of overflow.

[0090] In the embodiment of the present invention, in the third stage, the inner pot of the electric rice cooker vibrates to break bubbles in the inner pot of the electric rice cooker, including:

[0091] The temperature detection circuit detects the top temperature of the inner pot of the rice cooker, and generates a periodic driving signal after the top temperature reaches a second preset temperature;

[0092] The driving circuit generates a periodic pot detection current under the action of the periodic driving signal;

[0093] The resonant circuit generates periodic instantaneous electromagnetic pulses under the periodic pot detection current;

[0094] Wherein, the periodic pot detection current and the periodic instantaneous electromagnetic pulse are used to vibrate the inner pot of the electric rice cooker to burst the bubbles in the inner pot of the electric rice cooker.

[0095] Figure 4 FIG. 1 is a schematic diagram showing the structure of a resonant circuit and a driving circuit according to an embodiment of the present invention. Figure 4 As shown, the resonant circuit comprises:

[0096] An inductor L, connected to the driving circuit, and used to receive the periodic pot detection current;

[0097] A resonant capacitor C5, a first end of which is connected to the first end of the inductor L, and a second end of which is connected to the second end of the inductor L;

[0098] The inductor L and the resonant capacitor C5 form a resonant circuit, and the resonant circuit is used to generate the periodic instantaneous electromagnetic pulse according to the periodic pot detection current.

[0099] The periodic pot detection current and the periodic instantaneous electromagnetic pulse are also used to heat the food in the inner pot of the electric rice cooker.

[0100] In the embodiment of the present invention, the periodic driving signal generated by the driving circuit is a high level and a low level that change alternately, and the periodic pot detection current is also a large current and a small current that change alternately, or a large current and no current that change alternately.

[0101] The inductor coil L and the resonant capacitor C5 form a resonant circuit. Under the periodic pot detection current, the resonant capacitor C5 is periodically charged and discharged. According to the principle of electromagnetic induction, the periodic pot detection current generates a periodically changing electric field, and the changing electric field generates a changing magnetic field. Since the periodic pot detection current also alternates between large current and small current, or large current and no current, the generated magnetic field also alternates between large magnetic field and small magnetic field, or large magnetic field and no magnetic field. That is, the generated magnetic field can be regarded as a periodic instantaneous electromagnetic pulse.

[0102] Under the combined effect of periodic pot detection current and periodic instantaneous electromagnetic pulses, when a container containing magnetic conductive material is placed in a magnetic field, the magnetic lines of force on the surface of the container will generate eddy currents in the metal part at the bottom of the container. These eddy currents cause the carriers in the metal to move irregularly at high speed, and collide and rub against atoms, thereby generating heat energy.

[0103] At the same time, the periodic pot detection current of the inductor coil L generates periodic instantaneous electromagnetic pulses, which cause the inner pot of the rice cooker to generate periodic eddy currents. The eddy currents of the inner pot of the rice cooker generate a magnetic field in the opposite direction. The periodic instantaneous electromagnetic pulses of the inductor coil L interact with the electromagnetic field of the inner pot of the rice cooker, causing the inner pot of the rice cooker to vibrate. The vibration of the inner pot of the rice cooker can burst the bubbles in the rice cooker through physical action, thereby reducing the overflow of the rice cooker.

[0104] like Figure 4 As shown, the driving circuit includes:

[0105] A first resistor R1, a first end of which is connected to the temperature detection circuit;

[0106] A second resistor R2, a second end of which is connected to the first end of the first resistor R1;

[0107] A first transistor Q1, a base of which is connected to the second end of the first resistor R1, and an emitter of which is grounded;

[0108] A third resistor R3, a first end of which is connected to the base of the first transistor Q1, and a second end of which is grounded;

[0109] A second transistor Q2, the base of which is connected to the collector of the first transistor Q1, and the collector is grounded;

[0110] A first capacitor C1, a first end of which is connected to the base of the second transistor Q2, and a second end of which is grounded;

[0111] A fourth resistor R4, a first end of which is connected to the emitter of the second transistor Q2;

[0112] A third transistor Q3, the base of which is connected to the base of the second transistor;

[0113] A first diode D1, a cathode connected to the collector of the third transistor Q3, and an anode connected to the emitter of the third transistor Q3;

[0114] a fifth resistor R5, a first end of which is connected to the emitter of the third transistor Q3, and a second end of which is connected to the second end of the fourth resistor R4;

[0115] a sixth resistor R6, a first end of which is connected to the first end of the second resistor R2, and a second end of which is connected to the base of the third transistor Q3;

[0116] A seventh resistor R7, a first end of which is connected to the collector of the third transistor Q3, a first end of which is also connected to the first end of the sixth resistor R6, and a second end of which is connected to the power supply VC;

[0117] A second capacitor C2, a first end of which is grounded, and a second end of which is connected to the first end of the sixth resistor R6;

[0118] A third capacitor C3, a positive electrode of which is connected to the first end of the sixth resistor R6, and a negative electrode of which is grounded;

[0119] A voltage zener diode ZD1, a cathode of which is connected to the second end of the fourth resistor, and a positive electrode of which is grounded;

[0120] an eighth resistor R8, a first end of which is connected to the cathode of the voltage zener diode ZD1, and a second end of which is connected to the anode of the voltage zener diode ZD1;

[0121] An insulated gate bipolar transistor Q4, a base connected to the cathode of the voltage zener diode ZD1, an emitter connected to the anode of the voltage zener diode ZD1, and a collector connected to the inductor L;

[0122] Wherein, the third capacitor C3 is an electrolytic capacitor.

[0123] The driving circuit is connected to the temperature detection circuit, and in the third stage, the temperature detection circuit outputs a periodic driving signal. The driving circuit is connected to the periodic driving signal through the first resistor R1.

[0124] In the driving circuit, when the periodic driving signal is at a low level, the first transistor Q1 and the second transistor Q2 are turned off, the third transistor Q3 is turned on, and the second end of the fourth resistor R4 outputs an 18V voltage; when the periodic driving signal is at a high level, the first transistor Q1 and the second transistor Q2 are turned on, the third transistor Q3 is turned off, and the second end of the fourth resistor R4 outputs a 0V voltage.

[0125] The voltage stabilizing diode ZD1 and the eighth resistor R8 may form a protection unit for limiting the input voltage of the insulated gate bipolar transistor Q4 to protect the insulated gate bipolar transistor Q4 and the entire circuit.

[0126] When the gate input voltage of the insulated gate bipolar transistor Q4 is 18V, the insulated gate bipolar transistor Q4 is turned on; when the gate input voltage of the insulated gate bipolar transistor Q4 is 18V, the insulated gate bipolar transistor Q4 is turned off. The periodic pot detection current is output through the insulated gate bipolar transistor Q4.

[0127] Figure 5 Shown is a schematic cross-sectional view of an electric rice cooker according to an embodiment of the present invention, Figure 5 As shown, the inductor coil includes a bottom coil 510 and a side coil 520, and the length of the bottom coil 510 is greater than the length of the side coil 520;

[0128] The bottom coil 510 is a multi-layer wire component, each layer of the wire component is composed of a plurality of turns of wire, the multi-layer wire components are connected in sequence, and the electromagnetic pulses generated by each layer of the wire component are in the same direction.

[0129] Figure 6 In the illustrated embodiment, the bottom coil 510 includes three layers of wire components.

[0130] The inductor coil is concentrated at the bottom, which can make the vibration of the inner pot of the rice cooker more obvious, and can physically burst the bubbles as soon as possible, reducing the risk of overflow from the rice cooker.

[0131] In the embodiment of the present invention, the inner pot of the electric rice cooker is a multi-layer composite pot, and the outer layer or the inner layer of the multi-layer composite pot is a magnetic conductor.

[0132] In the embodiment of the present invention, the inner pot of the electric rice cooker is a multi-layer composite pot, the outer layer of the multi-layer composite pot is a stainless steel layer, and the inner layer is an aluminum pot body.

[0133] The outer layer is a stainless steel layer, which can prevent the inner pot of the rice cooker from rusting, and the stainless steel as the body can achieve the effect of heating and magnetic conductivity. The inner layer is an aluminum pot body, which can reduce the overall mass of the inner pot of the rice cooker, making the rice cooker easier to vibrate.

[0134] The outside of the stainless steel layer may also have other coatings to prevent the pan from sticking, which will not be described in detail here.

[0135] In the embodiment of the present invention, the electric rice cooker cooks rice in stages, and adopts a heating and stopping cycle process during operation, which can improve the taste of the finished product, reduce the cooking time, make the temperature of the inner pot more uniform, and reduce the risk of overflow. In addition, in the embodiment of the present invention, during cooking, the inner pot vibrates, which can cause the bubbles in the inner pot to burst and reduce the risk of overflow.

[0136] The embodiment of the present invention further provides an electric rice cooker overflow prevention device, the device comprising:

[0137] A control unit, used to make the rice cooker work in stages, and work periodically in each stage, each cycle includes working time and stop time, and the cycles in different stages are different;

[0138] an anti-overflow unit, used to vibrate the inner pot of the rice cooker in the third stage to break bubbles in the inner pot of the rice cooker;

[0139] Wherein, the third stage is the stage after the top temperature of the inner pot of the rice cooker reaches the second preset temperature.

[0140] In the embodiment of the present invention, the second preset temperature may be 100 degrees, or the second preset temperature may be the boiling point of water. Since the boiling point of water is different at different pressures and altitudes, the second preset temperature may vary according to actual conditions.

[0141] In the embodiment of the present invention, the control unit is further used for:

[0142] After starting, the electric rice cooker enters a first stage, in which the working time is a first time length and the stopping time is a second time length;

[0143] After the top temperature of the inner pot of the electric rice cooker reaches a first preset temperature, the electric rice cooker enters a second stage, in which the working time is a third time length and the stop time is a second time length;

[0144] When the top temperature of the inner pot of the electric rice cooker reaches the second preset temperature, the electric rice cooker enters the third stage, in which the working time is the fourth time length and the stop time is the fourth time length;

[0145] When the third stage lasts for a preset time, the rice cooker enters a fourth stage, in which the working time is the fifth time and the stopping time is the second time;

[0146] Among them, the first duration is shorter than the second duration, the third duration is shorter than the second duration, the third duration is longer than the first duration, the fourth duration is shorter than the first duration, and the fifth duration is shorter than the first duration.

[0147] Figure 6 FIG. 1 is a schematic diagram of an anti-overflow unit according to an embodiment of the present invention. Figure 6 As shown, the overflow prevention unit includes:

[0148] The temperature detection circuit 610 is used to detect the top temperature of the inner pot of the rice cooker, and generate a periodic driving signal after the top temperature reaches a second preset temperature;

[0149] The driving circuit 620 is used to generate a periodic pot detection current under the action of the periodic driving signal;

[0150] The resonant circuit 630 is used to generate periodic instantaneous electromagnetic pulses under the periodic pot detection current;

[0151] Wherein, the periodic pot detection current and the periodic instantaneous electromagnetic pulse are used to vibrate the inner pot of the electric rice cooker to burst the bubbles in the inner pot of the electric rice cooker.

[0152] In an embodiment of the present invention, the resonant circuit includes:

[0153] An inductor L, connected to the driving circuit, and used to receive the periodic pot detection current;

[0154] A resonant capacitor, a first end of which is connected to the first end of the inductor L, and a second end of which is connected to the second end of the inductor L;

[0155] The inductor L and the resonant capacitor form a resonant circuit, and the resonant circuit is used to generate the periodic instantaneous electromagnetic pulse according to the periodic pot detection current.

[0156] The periodic pot detection current and the periodic instantaneous electromagnetic pulse are also used to heat the food in the inner pot of the electric rice cooker.

[0157] In the embodiment of the present invention, the inductor coil L includes a bottom coil and a side coil, and the length of the bottom coil is greater than the length of the side coil;

[0158] The bottom coil is a multi-layer wire component, each layer of the wire component is composed of a plurality of turns of wire, the multi-layer wire components are connected in sequence, and the electromagnetic pulses generated by each layer of the wire components are in the same direction.

[0159] In the embodiment of the present invention, the inner pot of the electric rice cooker is a multi-layer composite pot, and the outer layer or the inner layer of the multi-layer composite pot is a magnetic conductor.

[0160] In the embodiment of the present invention, the inner pot of the electric rice cooker is a multi-layer composite pot, the outer layer of the multi-layer composite pot is a stainless steel layer, and the inner layer is an aluminum pot body.

[0161] In an embodiment of the present invention, the driving circuit includes:

[0162] A first resistor R1, a first end of which is connected to the temperature detection circuit;

[0163] A second resistor R2, a second end of which is connected to the first end of the first resistor R1;

[0164] A first transistor Q1, a base of which is connected to the second end of the first resistor R1, and an emitter of which is grounded;

[0165] A third resistor R3, a first end of which is connected to the base of the first transistor Q1, and a second end of which is grounded;

[0166] A second transistor Q2, the base of which is connected to the collector of the first transistor Q1, and the collector is grounded;

[0167] A first capacitor C1, a first end of which is connected to the base of the second transistor Q2, and a second end of which is grounded;

[0168] A fourth resistor R4, a first end of which is connected to the emitter of the second transistor Q2;

[0169] A third transistor Q3, the base of which is connected to the base of the second transistor;

[0170] A first diode D1, a cathode connected to the collector of the third transistor Q3, and an anode connected to the emitter of the third transistor Q3;

[0171] a fifth resistor R5, a first end of which is connected to the emitter of the third transistor Q3, and a second end of which is connected to the second end of the fourth resistor R4;

[0172] a sixth resistor R6, a first end of which is connected to the first end of the second resistor R2, and a second end of which is connected to the base of the third transistor Q3;

[0173] a seventh resistor R7, a first end of which is connected to the collector of the third transistor Q3, a first end of which is also connected to the first end of the sixth resistor R6, and a second end of which is connected to a power supply;

[0174] A second capacitor C2, a first end of which is grounded, and a second end of which is connected to the first end of the sixth resistor R6;

[0175] A third capacitor C3, a positive electrode of which is connected to the first end of the sixth resistor R6, and a negative electrode of which is grounded;

[0176] A voltage zener diode ZD1, a cathode of which is connected to the second end of the fourth resistor, and a positive electrode of which is grounded;

[0177] an eighth resistor R8, a first end of which is connected to the cathode of the voltage zener diode ZD1, and a second end of which is connected to the anode of the voltage zener diode ZD1;

[0178] An insulated gate bipolar transistor Q4, a base connected to the cathode of the voltage zener diode ZD1, an emitter connected to the anode of the voltage zener diode ZD1, and a collector connected to the inductor L;

[0179] Wherein, the third capacitor C3 is an electrolytic capacitor.

[0180] The driving circuit is connected to the temperature detection circuit, and in the third stage, the temperature detection circuit outputs a periodic driving signal. The driving circuit is connected to the periodic driving signal through the first resistor R1.

[0181] In the driving circuit, when the periodic driving signal is at a low level, the first transistor Q1 and the second transistor Q2 are turned off, the third transistor Q3 is turned on, and the second end of the fourth resistor R4 outputs an 18V voltage; when the periodic driving signal is at a high level, the first transistor Q1 and the second transistor Q2 are turned on, the third transistor Q3 is turned off, and the second end of the fourth resistor R4 outputs a 0V voltage.

[0182] The voltage stabilizing diode ZD1 and the eighth resistor R8 may form a protection unit for limiting the input voltage of the insulated gate bipolar transistor Q4 to protect the insulated gate bipolar transistor Q4 and the entire circuit.

[0183] When the gate input voltage of the insulated gate bipolar transistor Q4 is 18V, the insulated gate bipolar transistor Q4 is turned on; when the gate input voltage of the insulated gate bipolar transistor Q4 is 18V, the insulated gate bipolar transistor Q4 is turned off. The periodic pot detection current is output through the insulated gate bipolar transistor Q4.

[0184] The embodiment of the present invention further provides an electric rice cooker, using the method as described above.

[0185] In the embodiment of the present invention, the electric rice cooker cooks rice in stages, and adopts a heating and stopping cycle process during operation, which can improve the taste of the finished product, reduce the cooking time, make the temperature of the inner pot more uniform, and reduce the risk of overflow. In addition, in the embodiment of the present invention, during cooking, the inner pot vibrates, which can cause the bubbles in the inner pot to burst and reduce the risk of overflow.

[0186] Figures 2 to 3 FIG. 1 is a schematic flow diagram of an electric rice cooker overflow prevention method in one embodiment. It should be understood that although Figures 2 to 3The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figures 2 to 3 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0187] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0188] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0189] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preventing an electric rice cooker from overflowing, characterized in that: The method comprises: The rice cooker works in stages, and works periodically in each stage. Each cycle includes working time and stop time, and the cycles in different stages are different; In the third stage, the inner pot of the rice cooker vibrates to break the bubbles in the inner pot of the rice cooker; Wherein, the third stage is the stage after the top temperature of the inner pot of the rice cooker reaches the second preset temperature.

2. The method according to claim 1, characterized in that: The rice cooker works in stages, and works periodically in each stage. Each cycle includes working time and stop time. The cycles in different stages are different, including: After the electric rice cooker is started, it enters a first stage. In the first stage, the working time is a first time, and the stop time is a second time; After the top temperature of the inner pot of the electric rice cooker reaches the first preset temperature, the electric rice cooker enters the second stage, in which the working time is the third time and the stop time is the second time; When the top temperature of the inner pot of the electric rice cooker reaches the second preset temperature, the electric rice cooker enters the third stage, in which the working time is the fourth time length and the stop time is the fourth time length; When the third stage lasts for a preset time, the rice cooker enters a fourth stage, in which the working time is the fifth time, and the stop time is the second time; Among them, the first duration is shorter than the second duration, the third duration is shorter than the second duration, the third duration is longer than the first duration, the fourth duration is shorter than the first duration, and the fifth duration is shorter than the first duration.

3. The method according to claim 1, characterized in that In the third stage, the inner pot of the electric rice cooker vibrates to break bubbles in the inner pot of the electric rice cooker, comprising: The temperature detection circuit detects the top temperature of the inner pot of the rice cooker, and generates a periodic driving signal after the top temperature reaches a second preset temperature; The driving circuit generates a periodic pot detection current under the action of the periodic driving signal; The resonant circuit generates periodic instantaneous electromagnetic pulses under the periodic pot detection current; Wherein, the periodic pot detection current and the periodic instantaneous electromagnetic pulse are used to vibrate the inner pot of the electric rice cooker to burst the bubbles in the inner pot of the electric rice cooker.

4. The method according to claim 3, characterized in that: The resonant circuit comprises: An inductor coil connected to the driving circuit and used for receiving the periodic pot detection current; a resonant capacitor, a first end of which is connected to the first end of the inductor coil, and a second end of which is connected to the second end of the inductor coil; The inductor coil and the resonant capacitor form a resonant circuit, and the resonant circuit is used to generate the periodic instantaneous electromagnetic pulse according to the periodic pot detection current. The periodic pot detection current and the periodic instantaneous electromagnetic pulse are also used to heat the food in the inner pot of the electric rice cooker.

5. The method according to claim 4, characterized in that The inductor coil comprises a bottom coil and a side coil, and the length of the bottom coil is greater than the length of the side coil; The bottom coil is a multi-layer wire component, each layer of the wire component is composed of a plurality of turns of wire, the multi-layer wire components are connected in sequence, and the electromagnetic pulses generated by each layer of the wire components are in the same direction.

6. The method according to claim 4, characterized in that The inner pot of the electric rice cooker is a multi-layer composite pot, and the outer layer or the inner layer of the multi-layer composite pot is a magnetic conductor.

7. The method according to claim 4, characterized in that The inner pot of the electric rice cooker is a multi-layer composite pot, the outer layer of the multi-layer composite pot is a stainless steel layer, and the inner layer is an aluminum pot body.

8. The method according to claim 4, characterized in that The driving circuit comprises: A first resistor, a first end of which is connected to the temperature detection circuit; a second resistor, a second end of which is connected to the first end of the first resistor; A first triode, a base of which is connected to the second end of the first resistor and an emitter of which is grounded; a third resistor, a first end of which is connected to the base of the first transistor, and a second end of which is grounded; A second triode, the base of which is connected to the collector of the first triode, and the collector is grounded; A first capacitor, a first end of which is connected to the base of the second transistor, and a second end of which is grounded; a fourth resistor, a first end of which is connected to the emitter of the second triode; a third triode, the base of which is connected to the base of the second triode; a first diode, a cathode connected to the collector of the third triode, and a cathode connected to the emitter of the third triode; a fifth resistor, a first end of which is connected to the emitter of the third transistor, and a second end of which is connected to the second end of the fourth resistor; a sixth resistor, a first end of which is connected to the first end of the second resistor, and a second end of which is connected to the base of the third transistor; a seventh resistor, wherein a first end of the seventh resistor is connected to the collector of the third triode, a first end of the seventh resistor is also connected to the first end of the sixth resistor, and a second end of the seventh resistor is connected to a power supply; a second capacitor, a first end of which is grounded, and a second end of which is connected to the first end of the sixth resistor; a third capacitor, a positive electrode of which is connected to the first end of the sixth resistor and a negative electrode of which is grounded; a voltage stabilizing diode, wherein the cathode is connected to the second end of the fourth resistor and the anode is grounded; an eighth resistor, a first end of which is connected to the cathode of the voltage zener diode, and a second end of which is connected to the anode of the voltage zener diode; An insulated gate bipolar transistor, wherein the base is connected to the cathode of the voltage zener diode, the emitter is connected to the anode of the voltage zener diode, and the collector is connected to the inductor; Wherein, the third capacitor is an electrolytic capacitor.

9. An anti-overflow device for an electric rice cooker, characterized in that: The device comprises: A control unit, used to make the rice cooker work in stages, and work periodically in each stage, each cycle includes working time and stop time, and the cycles in different stages are different; an anti-overflow unit, used to vibrate the inner pot of the rice cooker in the third stage to break bubbles in the inner pot of the rice cooker; Wherein, the third stage is the stage after the top temperature of the inner pot of the rice cooker reaches the second preset temperature.

10. An electric rice cooker, characterized in that: The method according to any one of claims 1 to 8 is applied.

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