Circuit structure, cooking appliance and control method thereof

Abstract

This application provides a circuit structure, a cooking appliance, and a control method thereof. The circuit structure includes a control unit, a mains power detection circuit, a battery storage device, and a motor drive circuit. One end of the mains power detection circuit is electrically connected to the control unit, and the other end is adapted to be connected to mains power. The battery storage device is electrically connected to the control unit. The battery storage device is used to store and release electrical energy. The battery storage device is adapted to be electrically connected to the drive motor. One end of the motor drive circuit is electrically connected to the control unit, and the other end is adapted to be electrically connected to the drive motor. This application determines whether the power is off by detecting and judging whether the voltage at the output terminal of the mains power detection circuit is zero. The battery storage device is charged when the mains power detection circuit is energized, and supplies power to the control unit and the motor drive circuit when the mains power detection circuit is de-energized. Thus, in the power-off state, the electrical energy of the battery storage device can be used to control the operation of the motor drive circuit, and in the state where the motor drive circuit is connected to the drive motor, the drive motor can be controlled to operate.

Description

Technical Field

[0001] This application relates generally to the technical field of cooking appliances, and more specifically to a circuit structure, a cooking appliance, and a control method thereof. Background Technology

[0002] In related technologies, the cooking appliance's lid and pot body remain locked during cooking. If a power outage occurs during cooking, the lid remains locked to the pot body and is difficult to unlock. If the time for power restoration is uncertain, the inability to unlock and open the lid promptly will significantly impact the user experience.

[0003] Therefore, there is a need to provide a circuit structure, cooking appliance, and control method thereof to at least partially solve the above problems. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, a first aspect of this application provides a circuit structure for a cooking appliance, the circuit structure comprising:

[0006] Control unit;

[0007] A mains power detection circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be connected to mains power;

[0008] An energy storage device, electrically connected to the control unit, the energy storage device being used to store and release electrical energy, and adapted to be electrically connected to a drive motor; and

[0009] A motor drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to the drive motor.

[0010] The control unit is configured to:

[0011] The system detects and determines whether the voltage at the output of the mains power detection circuit is zero.

[0012] If the voltage at the output terminal of the mains power detection circuit is not zero, then electrical energy is supplied to the energy storage device;

[0013] If the voltage at the output terminal of the mains power detection circuit is zero, then electrical energy is obtained from the energy storage device, and the motor drive circuit is turned on to make the drive motor work.

[0014] According to the circuit structure of the first aspect of this application, the power is cut off by detecting and judging whether the voltage at the output terminal of the mains power detection circuit is zero. The energy storage device is charged when the mains power detection circuit is powered on, and supplies power to the control unit and the motor drive circuit when the mains power detection circuit is de-energized. Thus, the energy storage device can be used to control the drive circuit to work when the power is cut off, and the drive motor can be controlled to work when the motor drive circuit is connected to the drive motor.

[0015] Optionally, if the voltage at the output terminal of the mains power detection circuit is zero, the control unit sequentially supplies a starting current and a running current to the motor drive circuit, wherein the starting current is greater than the running current.

[0016] According to this application, when the mains power detection circuit detects a power outage, the motor drive circuit first supplies a starting current to the drive motor to meet the larger current demand of the drive motor during startup. Then, the motor drive circuit supplies a running current to the drive motor to meet the smaller current demand of the drive motor when maintaining operation. Since the starting current and running current are supplied to the drive motor sequentially, the current required by the drive motor during startup and operation can be rationally allocated. Compared with always supplying the power with the starting current, this can effectively save energy, thereby improving the energy utilization rate of the energy storage device in the event of a power outage.

[0017] Optionally, the motor drive circuit includes:

[0018] A first drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to the drive motor, wherein the first drive circuit supplies the starting current; and

[0019] A second drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to the drive motor, supplies the operating current.

[0020] The control unit is configured to:

[0021] If the voltage at the output terminal of the mains power detection circuit is zero, then one of the first drive circuit and the second drive circuit is selectively turned on in sequence to make the drive motor work.

[0022] According to this application, when the first drive circuit is connected to the drive motor, the drive motor is powered by the first drive circuit using the starting current to meet the larger current requirement of the drive motor during startup. When the second drive circuit is connected to the drive motor, the drive motor is powered by the second drive circuit using the operating current to meet the smaller current requirement of the drive motor while it is running. Furthermore, the first and second drive circuits are connected sequentially and not simultaneously. This allows for a reasonable allocation of the current required by the drive motor during startup and operation, effectively saving energy compared to always using the starting current, thereby improving the energy utilization rate of the energy storage device during power outages.

[0023] Optionally, the first driving circuit and the second driving circuit each include a first base voltage divider resistor, a second base voltage divider resistor, and a transistor. One end of the first base voltage divider resistor is electrically connected to the control unit, and the other end of the first base voltage divider resistor is electrically connected to the base of the transistor. One end of the second base voltage divider resistor is electrically connected to the base of the transistor, and the other end of the second base voltage divider resistor and the emitter of the transistor are both grounded. The collector of the transistor is electrically connected to the driving motor.

[0024] According to this application, the base of the first transistor is powered by a voltage divider resistor (first base voltage divider resistor and second base voltage divider resistor), and the control unit can power the drive motor by controlling the transistor to conduct. When the transistor is conducting, a current greater than the base current can be supplied to the drive motor.

[0025] Optionally, the first base voltage divider resistor of the first driving circuit and the first base voltage divider resistor of the second driving circuit are the same, and the second base voltage divider resistor of the first driving circuit and the second base voltage divider resistor of the second driving circuit are the same.

[0026] The transistor in the first driving circuit is a first transistor, and the transistor in the second driving circuit is a second transistor. The amplification factor of the first transistor is greater than that of the second transistor.

[0027] According to this application, when the first base voltage divider resistor of the first driving circuit and the first base voltage divider resistor of the second driving circuit are the same, and the second base voltage divider resistor of the first driving circuit and the second driving circuit are the same, since the amplification factor of the first transistor in the first driving circuit is greater than that of the second transistor in the second driving circuit, the output current of the first driving circuit is greater than the output current of the second driving circuit. This allows the first driving circuit to supply the starting current, and the second driving circuit to supply the operating current.

[0028] Optionally, the amplification factor of the first transistor is greater than or equal to twice the amplification factor of the second transistor.

[0029] According to this application, the current output by the first driving circuit is greater than or equal to twice the current output by the second driving circuit.

[0030] Optionally, the amplification factor of the transistor in the first driving circuit is the same as that of the transistor in the second driving circuit.

[0031] The first base voltage divider resistor of the first driving circuit is the first start-up voltage divider resistor, and the second base voltage divider resistor of the first driving circuit is the second start-up voltage divider resistor;

[0032] The first base voltage divider resistor of the second driving circuit is the first operating voltage divider resistor, and the second base voltage divider resistor of the second driving circuit is the second operating voltage divider resistor;

[0033] The ratio of the resistance of the second starting voltage divider resistor to the sum of the resistances of the first starting voltage divider resistor and the second starting voltage divider resistor is greater than the ratio of the resistance of the second running voltage divider resistor to the sum of the resistances of the first running voltage divider resistor and the second running voltage divider resistor.

[0034] According to this application, when the amplification factor of the transistor in the first driving circuit is the same as that of the transistor in the second driving circuit, by reasonably allocating the proportion of the second base voltage divider resistor in the first driving circuit and the second driving circuit to the sum of the resistance values ​​of the first base voltage divider resistor and the second base voltage divider resistor, the resistance value of the second base voltage divider resistor in the first driving circuit is made to account for a larger proportion of the sum of the resistance values ​​of the first base voltage divider resistor and the second base voltage divider resistor, thereby achieving the purpose of the first driving circuit outputting the starting current and the second driving circuit outputting the operating current.

[0035] Optionally, the ratio of the resistance of the second starting voltage divider resistor to the sum of the resistance of the first starting voltage divider resistor and the resistance of the second starting voltage divider resistor is greater than or equal to 1.5 times the ratio of the resistance of the second operating voltage divider resistor to the sum of the resistance of the first operating voltage divider resistor and the resistance of the second operating voltage divider resistor.

[0036] According to this application, by setting it in this way, the base current of the first driving circuit can be greater than or equal to 1.5 times the base current of the second driving circuit, thereby achieving that the output current of the first driving circuit is greater than or equal to 1.5 times the output current of the second driving circuit.

[0037] Optionally, the control unit is configured to:

[0038] If the voltage at the output of the mains power detection circuit is zero, the motor drive circuit is controlled to work sequentially during the start-up period and the maintenance operation period. A start-up pulse width modulation signal is input to the motor drive circuit during the start-up period, and a maintenance operation pulse width modulation signal is input to the motor drive circuit during the maintenance operation period. The start-up period and the maintenance operation period are sequentially continuous, and the duty cycle of the start-up pulse width modulation signal is greater than the duty cycle of the maintenance operation pulse width modulation signal.

[0039] According to this application, by first inputting a pulse width modulation signal with a large duty cycle to the motor drive circuit, the motor drive circuit is controlled to output a starting current. Then, by inputting a pulse width modulation signal with a small duty cycle to the motor drive circuit, the motor drive circuit is controlled to output an operating current.

[0040] Optionally, the duty cycle of the start pulse width modulation signal is greater than or equal to 2.5 times the duty cycle of the maintain operation pulse width modulation signal.

[0041] According to this application, by first inputting a pulse width modulation signal to the motor drive circuit that is greater than or equal to 2.5 times the pulse width modulation signal input later, the motor drive circuit can be controlled to output starting current and running current sequentially.

[0042] Optionally, the mains power detection circuit includes:

[0043] AC power input terminal;

[0044] A first voltage divider resistor, one end of which is electrically connected to the mains input terminal;

[0045] A second voltage divider resistor, one end of which is electrically connected to the other end of the first voltage divider resistor, and the other end of which is grounded; the resistance of the second voltage divider resistor is less than the resistance of the first voltage divider resistor; and

[0046] A third diode, one end of which is connected to a direct current source.

[0047] The control unit is electrically connected between the first voltage divider resistor and the second voltage divider resistor.

[0048] The control unit is configured to:

[0049] The voltage at the output of the mains power detection circuit is determined by whether the voltage between the first and second voltage divider resistors is zero.

[0050] If the voltage between the first voltage divider resistor and the second voltage divider resistor is zero, then the voltage at the output terminal of the mains power detection circuit is determined to be zero.

[0051] If the voltage between the first voltage divider resistor and the second voltage divider resistor is not zero, then it is determined that the voltage at the output terminal of the mains power detection circuit is not zero.

[0052] According to this application, a voltage divider is used between the mains power and ground by a first voltage divider resistor and a second voltage divider resistor. By detecting and judging whether the voltage between the first voltage divider resistor and the second voltage divider resistor is zero, it is determined whether the voltage at the output terminal of the mains power detection circuit is zero, thereby determining whether a power outage has occurred.

[0053] Optionally, the energy storage device includes an energy storage element.

[0054] According to this application, the energy storage device specifically achieves energy storage and discharge through energy storage elements.

[0055] Optionally, the energy storage device includes at least two energy storage elements, each of which is connected in parallel.

[0056] According to this application, since the energy storage device includes energy storage elements connected in parallel, this helps to improve the energy storage capacity of the energy storage device.

[0057] Optionally, the energy storage element is a capacitor or a battery.

[0058] According to this application, the energy storage element can be either a capacitor or a battery, thus increasing the flexibility in selecting the energy storage element.

[0059] Optionally, the circuit structure includes a fourth diode and an external circuit, with a first terminal of the energy storage device connected to the external circuit via the fourth diode, the fourth diode being configured to cut off when current flows from the energy storage device to the external circuit.

[0060] According to this application, by placing a diode between the energy storage device and the external circuit, power can be cut off from the external circuit during power outages, thereby saving the energy of the energy storage device.

[0061] Optionally, the circuit structure includes:

[0062] A pressure relief drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to an electric pressure relief device.

[0063] The control unit is configured to:

[0064] If the voltage at the output terminal of the mains power detection circuit is zero, then electrical energy is obtained from the energy storage device, and the pressure relief drive circuit is turned on to make the electric pressure relief device work.

[0065] According to this application, the pressure relief drive circuit can be controlled to release pressure in the power-off state, thereby reducing the pressure in the cooking space and thus reducing safety risks.

[0066] Optionally, the circuit structure further includes:

[0067] A display component and / or a buzzer, the display component and / or the buzzer being electrically connected to the control unit and the battery storage device.

[0068] The control unit is configured to: if the voltage at the output terminal of the mains power detection circuit is zero, control the display component to display a reminder message, and / or the buzzer to sound.

[0069] According to this application, a display component is added, and a reminder message is displayed on the display component to alert the user in the event of a power outage. A buzzer is also added, and the buzzer sounds to alert the user in the event of a power outage.

[0070] A second aspect of this application provides a control method for a cooking appliance, the cooking appliance including the circuit structure described above, the control method comprising:

[0071] The system detects and determines whether the voltage at the output of the mains power detection circuit is zero.

[0072] If the voltage at the output terminal of the mains power detection circuit is not zero, then electrical energy is supplied to the energy storage device;

[0073] If the voltage at the output terminal of the mains power detection circuit is zero, then electrical energy is obtained from the energy storage device, and the motor drive circuit is turned on to make the drive motor work.

[0074] According to the control method of the second aspect of this application, the power outage is determined by detecting and judging whether the voltage at the output terminal of the mains power detection circuit is zero. When the mains power detection circuit is energized, the battery is charged. When the power is off, the battery can be used to control the motor drive circuit. Furthermore, when the motor drive circuit is connected to the drive motor, the drive motor can be controlled to work.

[0075] Optionally, if the voltage at the output terminal of the mains power detection circuit is zero, the control unit sequentially supplies a starting current and a running current to the motor drive circuit, wherein the starting current is greater than the running current.

[0076] According to this application, when the mains power detection circuit detects a power outage, the motor drive circuit first supplies a starting current to the drive motor to meet the larger current demand of the drive motor during startup. Then, the motor drive circuit supplies a running current to the drive motor to meet the smaller current demand of the drive motor when maintaining operation. Since the starting current and running current are supplied to the drive motor sequentially, the current required by the drive motor during startup and operation can be rationally allocated. Compared with always supplying the power with the starting current, this can effectively save energy, thereby improving the energy utilization rate of the energy storage device in the event of a power outage.

[0077] Optionally, the motor drive circuit includes:

[0078] A first drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to the drive motor, wherein the first drive circuit supplies the starting current; and

[0079] A second drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to the drive motor, supplies the operating current.

[0080] The control method includes:

[0081] If the voltage at the output terminal of the mains power detection circuit is zero, then first control the first driving circuit to turn on while keeping the second driving circuit off, and then control the first driving circuit to turn off while controlling the second driving circuit to turn on.

[0082] According to this application, when the first drive circuit is connected to the drive motor, it supplies power to the drive motor with a larger current to meet the energy demand of the drive motor during startup. When the second drive circuit is connected to the drive motor, it supplies power to the drive motor with a smaller current to meet the energy demand of the drive motor while it is running. Furthermore, the first and second drive circuits are not simultaneously activated. This allows for a more efficient allocation of the energy required by the drive motor during startup and operation, effectively saving energy compared to always supplying power at the startup current. This also improves the energy utilization rate of the energy storage device during power outages.

[0083] Optionally, the cooking appliance includes an electric pressure relief device, and the circuit structure includes:

[0084] A pressure relief drive circuit, one end of which is electrically connected to the control unit, and the other end of which is adapted to be electrically connected to the electric pressure relief device.

[0085] The control method includes:

[0086] If the voltage at the output terminal of the mains power detection circuit is zero, then electrical energy is obtained from the energy storage device, and the pressure relief drive circuit is turned on to make the electric pressure relief device work.

[0087] According to this application, the pressure relief drive circuit can be controlled to release pressure in the power-off state, thereby reducing the pressure in the cooking space and thus reducing safety risks.

[0088] Optionally, the circuit structure further includes:

[0089] A display component and / or a buzzer, the display component and / or buzzer being electrically connected to the control unit and the battery storage device.

[0090] The control method includes:

[0091] If the voltage at the output terminal of the mains power detection circuit is zero, the display component is controlled to display a reminder message, and / or the buzzer is controlled to sound, wherein the reminder message includes text reminder information.

[0092] According to this application, a reminder message is displayed via a control display component during a power outage to alert the user. A buzzer can also be sounded during a power outage to further remind the user.

[0093] Optionally, the mains power detection circuit includes:

[0094] AC power input terminal;

[0095] A first voltage divider resistor, one end of which is electrically connected to the mains input terminal;

[0096] A second voltage divider resistor, one end of which is electrically connected to the other end of the first voltage divider resistor, and the other end of which is grounded; the resistance of the second voltage divider resistor is less than the resistance of the first voltage divider resistor; and

[0097] A third diode, one end of which is connected to a direct current source.

[0098] The control unit is electrically connected between the first voltage divider resistor and the second voltage divider resistor.

[0099] The method for determining whether the voltage at the output terminal of the mains power detection circuit is zero is as follows:

[0100] The voltage at the output of the mains power detection circuit is determined by whether the voltage between the first and second voltage divider resistors is zero.

[0101] If the voltage between the first voltage divider resistor and the second voltage divider resistor is zero, then the voltage at the output terminal of the mains power detection circuit is determined to be zero.

[0102] If the voltage between the first voltage divider resistor and the second voltage divider resistor is not zero, then it is determined that the voltage at the output terminal of the mains power detection circuit is not zero.

[0103] According to this application, by detecting and judging whether the voltage between the first voltage divider resistor and the second voltage divider resistor is zero, it is determined whether the voltage at the output terminal of the mains power detection circuit is zero, thereby determining whether a power outage has occurred.

[0104] Optionally, the control method includes:

[0105] If the voltage at the output of the mains power detection circuit is zero, the clock is switched from the first clock to the second clock, where the frequency of the first clock is higher than that of the second clock.

[0106] According to this application, after a power outage is determined, the frequency of program operation is reduced by switching from the first clock to the second clock, which helps to reduce energy consumption.

[0107] Optionally, the control method further includes:

[0108] After determining that the voltage at the output terminal of the mains power detection circuit is zero, the system detects and determines whether the voltage at the output terminal of the mains power detection circuit is zero.

[0109] If the voltage at the output of the mains power detection circuit is not zero, the circuit switches from the second clock to the first clock, where the frequency of the first clock is higher than that of the second clock.

[0110] According to this application, if power is detected after a power outage, the normal operating frequency is restored by switching from the second clock to the first clock, thereby improving programmable efficiency.

[0111] Optionally, the control method includes:

[0112] After controlling the first driving circuit to turn on and keeping the second driving circuit off for a first preset time, the first driving circuit is controlled to turn off and the second driving circuit is controlled to turn on.

[0113] According to this application, after the first driving circuit is turned on for a first preset time, the first driving circuit is turned off and the second driving circuit is turned on.

[0114] Optionally, the control method further includes:

[0115] After a second preset time has elapsed between disabling the first drive circuit and turning on the second drive circuit, the system enters a sleep state.

[0116] According to this application, after the second drive circuit is turned on and continues for a second preset time, the second drive circuit is controlled to turn off and enter a sleep state to reduce energy consumption.

[0117] Optionally, starting from the start of the sleep state, the circuit is woken up every third preset time interval to detect and determine whether the voltage at the output terminal of the mains power detection circuit is zero.

[0118] If the voltage at the output of the mains power detection circuit is zero, it will enter sleep mode again.

[0119] According to this application, by waking the device periodically after it enters a hibernation state to determine whether it is powered on, and then re-entering the hibernation state after confirming that it is not powered on, energy consumption can be reduced.

[0120] A third aspect of this application provides a cooking appliance, which includes the circuit structure described above.

[0121] According to the cooking appliance of the third aspect of this application, the lid assembly can be locked and unlocked even when the power is off. Attached Figure Description

[0122] The following drawings, illustrating embodiments of this application, are incorporated herein by reference and are used to understand this application. The drawings illustrate embodiments of this application and their descriptions, serving to explain the principles of this application. In the drawings,

[0123] Figure 1 A cross-sectional view of a cooking appliance according to a preferred embodiment of this application;

[0124] Figure 2 for Figure 1 An exploded view of the cooking appliance shown;

[0125] Figure 3 A perspective view of a cooking appliance without a lid according to a preferred embodiment of this application;

[0126] Figure 4 for Figure 1 A cross-sectional view of the cover assembly;

[0127] Figure 5 for Figure 3 A cross-sectional view of the lid assembly of a cooking utensil excluding the top cover;

[0128] Figure 6 for Figure 3 The image shows a top view of a cooking appliance without a lid, with the fasteners in the locked position.

[0129] Figure 7 for Figure 3The image shows a top view of a cooking appliance without a lid, with the fasteners in the unlocked position.

[0130] Figure 8 This is a schematic diagram of a portion of the structure of a fastening assembly according to a preferred embodiment of this application.

[0131] Figure 9 for Figure 3 A top view of the rotating frame shown;

[0132] Figure 10 This is a connection diagram of a drive motor, transmission connector, rotating frame, fastening assembly, cover locking assembly and button assembly according to a preferred embodiment of this application.

[0133] Figure 11 This is a schematic diagram of the circuit structure of a cooking appliance according to a preferred embodiment of the present application;

[0134] Figure 12 for Figure 11 A schematic diagram of the mains power detection circuit in the circuit.

[0135] Figure 13 A schematic diagram of the circuit structure of a cooking appliance according to another preferred embodiment of this application; and

[0136] Figure 14 This is a flowchart of a control method for a cooking appliance according to another preferred embodiment of this application.

[0137] Explanation of reference numerals in the attached figures:

[0138] 10: Pot body components 101: Pot inner pot

[0139] 11: Cover assembly 110: Cover body

[0140] 1101: Steam passage; 111: Cover

[0141] 1111: Faceplate body 11111: First receiving cavity

[0142] 1112: Panel 112: Liner

[0143] 113: Inner cover; 1131: Inner cover sealing ring

[0144] 114: Steam valve; 116: Control circuit board

[0145] 120: Electric pressure relief device; 131: Fastening component

[0146] 1312: First fastening part; 1313: Second fastening part

[0147] 1314: Connecting part; 132: Transmission frame

[0148] 1321: Guide hole; 13211: Drive section

[0149] 1323: Trigger part; 13209: Limiting hole

[0150] 133: Transmission connector; 1331: Connecting shaft

[0151] 134: Drive motor

[0152] 136: Float component; 137: Guide connector

[0153] 140: Position detection device; 141: Locked position detection device

[0154] 142: Unlock position detection device; 151: Mains power detection circuit

[0155] 151a: First voltage divider resistor; 151b: Second voltage divider resistor

[0156] 152: Control Unit; 153: Motor Drive Circuit

[0157] 153a: First driving circuit; 153b: Second driving circuit

[0158] 154: Pressure relief drive circuit; BZ1: Buzzer

[0159] 156: Temperature measurement circuit; 156a: Top temperature measurement circuit

[0160] 156b: Bottom temperature sensing circuit; 157: Mains power supply circuit

[0161] 157a: Rectifier bridge; 157c: First voltage regulator

[0162] 157d: Second voltage regulator; 158: Energy storage device

[0163] 160: Cover safety component P1: First limit position

[0164] P2: Second extreme position; AX: Rotation axis

[0165] AX1: First axis line; AX2: Second axis line

[0166] RO1: First rotation direction; RO2: Second rotation direction

[0167] X: Forward / backward direction; Z: Height direction Detailed Implementation

[0168] In the following description, numerous specific details are set forth to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that embodiments of this application may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with embodiments of this application.

[0169] To fully understand the embodiments of this application, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this application is not limited to the specific details familiar to those skilled in the art.

[0170] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the scope of this application. The singular forms “a,” “an,” and “the” / “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0171] The ordinal numbers such as "first" and "second" used in this application are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of a "second component," and the term "second component" does not imply the existence of a "first component." It should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and similar expressions used in this application are for illustrative purposes only and are not intended to be limiting.

[0172] The terms “parallel” / “perpendicular” and similar expressions used in this application include absolute parallel / perpendicular relationships and approximately parallel / perpendicular relationships (e.g., relationships that differ from absolute parallel / perpendicular relationships by a range of -5° to +5°), and have equivalent effects.

[0173] The specific embodiments of this application will be described in more detail below with reference to the accompanying drawings, which illustrate representative embodiments of this application and are not intended to limit this application.

[0174] like Figures 1 to 14 As shown, this application provides a cooking appliance. The cooking appliance may include a pot body assembly 10, a lid assembly 11, a temperature detection device (not shown), an electric pressure relief device 120, a position detection device 140, and a circuit structure having a control unit 152.

[0175] The pot body assembly 10 is used for cooking food. The lid assembly 11 is used to close the pot body assembly 10. For example, the lid assembly 11 is connected to the pot body assembly 10 in an openable and closable manner to close the pot body assembly 10. When the lid assembly 11 closes the pot body assembly 10, a cooking space is formed between the lid assembly 11 and the pot body assembly 10.

[0176] The cooker assembly 10 includes a pot 101, a middle frame 102, a heating device (not shown), and a temperature detection device. The pot 101, used to hold food, is removably mounted within the cooker assembly 10. The cooking space can also be referred to as a cooking cavity. The middle frame 102 can be referred to as a heat insulation cover. The middle frame 102 is located between the outer circumferential side of the pot 101 and the base 107 and is fixed to the base 107. It is suitable for positioning the pot 101 and also serves to insulate and retain heat. The heating device is located at the bottom of the cooker assembly 10 and below the pot 101 to heat the food inside the pot 101.

[0177] The control unit 152 can be located on the control circuit board 116. The control circuit board 116 also includes a digital display device, circuitry, and other structures. The control unit 152 can be, for example, a microcontroller unit (MCU) used to control the cooking process of the cooking appliance. Figure 2 As shown, the control circuit board 116 can be disposed on the lid assembly 11. A temperature detection device is used to detect the temperature of the cooking space or related to the cooking space. The temperature detection device includes a bottom temperature detection device and a top temperature detection device. The bottom temperature detection device is disposed, for example, on the bottom or side of the pot body, for detecting the temperature of the bottom of the pot or indirectly the bottom of the cooking space. The top temperature detection device is disposed, for example, on the lid, for detecting the temperature of the top of the cooking space. Both the heating device and the temperature detection device are electrically connected to the control unit. The temperature detection device feeds back the sensed temperature information to the control unit, thereby enabling the control unit to perform more precise control of, for example, the heating device, based on the temperature information.

[0178] See Figures 2 to 7 In this application, one end of the lid assembly 11 in the front-rear direction X is rotatably connected to the pot body assembly 10 via a pivot shaft about the rotation axis AX. An opening torsion spring 104 is disposed on the pivot shaft, with its two ends abutting against the lid assembly 11 and the pot body assembly 10 respectively, allowing the opening torsion spring 104 to apply an elastic force to the lid assembly 11 away from the pot body assembly 10. When the lid assembly 11 is opened, it springs upward under the elastic force of the opening torsion spring 104 and rotates about the pivot shaft. The other end of the lid assembly 11 in the front-rear direction X is detachably connected to the pot body assembly 10 via a lid locking assembly 160 and a button assembly (not shown).

[0179] See Figure 2The lid assembly 11 includes a lid body 110, electrical components, valve components, etc. The lid body 110 includes a face cover 111, a liner 112, and an inner cover 113. The face cover 111 is located on the outermost (i.e., uppermost) side of the lid assembly 11, forming the outer shell of the lid assembly 11. The liner 112 is located below the face cover 111 and is connected to the face cover 111. For example, the liner 112 can be connected to the face cover 111 via fasteners, snap-fit ​​connectors, or other connectors. The liner 112 is mainly used to centrally mount various functional components of the lid assembly 11 that sense and control the working status of the cooking appliance, such as sensors. The inner cover 113 is located on the innermost (i.e., lowermost) side of the lid assembly 11 and is located below the liner 112. The inner cover 113 is detachably connected to the liner 112 via detachable connectors such as snap-fit ​​connectors for easy cleaning and replacement. The inner cover 113 faces the cooking space. When the lid assembly 11 is closed on the pot body assembly 10, the inner lid 113 is located directly above the cooking space. Furthermore, an inner lid sealing ring 1131 is provided on the outer periphery of the inner lid 113. The inner lid sealing ring 1131 is used to seal the gap between the inner lid 113 and the pot body 101 when the inner lid 113 is closed with the pot body 101. The inner lid 113 has a radial direction and an axial direction. The radial direction is the radial direction of the circle with respect to the geometric center of the inner lid 113. The axial direction is the direction passing through the geometric center of the inner lid 113 and parallel to the thickness direction of the inner lid. Here, the geometric center of the inner lid 113, in the example where the inner lid is circular, is the exact center of the inner lid or the center of the circle.

[0180] Furthermore, the aforementioned cover 111 may include a cover body 1111 and a panel 1112. The cover body 1111 is located on the side of the panel 1112 closer to the liner 112 in the thickness direction of the cover assembly 11. In one example, a first receiving cavity 11111 is formed between the cover body 1111 and the panel 1112. The first receiving cavity 11111 can accommodate electrical structures such as a control circuit board 116. The first receiving cavity 11111 may be formed by a partial recess on the upper surface of the cover body 1111, and correspondingly, a partial bulge is formed on the lower surface of the cover body 1111.

[0181] See Figures 2 to 7For example, the cover assembly 11 is provided with a steam valve 114 and an electric pressure relief device 120. The steam valve 114 has a steam vent (not shown) that communicates with the outside environment. The cover assembly 11 also has a steam passage 1101 that communicates with the steam valve 114. The cooking space is connected to the external environment through the steam passage 1101 and the steam valve 114. The external environment refers to the environment outside the cooking appliance. In this application, the steam valve 114 is used to connect the cooking space to the external environment to release steam generated during cooking. The electric pressure relief device 120 is electrically connected to a control unit and is controlled to switch between an open state (open steam passage 110a) and a closed state (closed steam passage 110a).

[0182] To reduce heat loss during cooking, the pot body 100 includes the aforementioned heat-insulating cover, such as... Figure 2 As shown. In this design, the fastening element 131 can engage with the edge of the inner pot 101 or the edge of the insulation cover. For example, in a rice cooker, the fastening element 131 can engage with the edge of the inner pot 101. For example, in an electric pressure cooker, the edge of the insulation cover is at least partially exposed, and the fastening element 131 can engage with the edge of the insulation cover. For ease of explanation, the following description will focus on the example of the fastening element 131 engaging with the edge of the inner pot 101.

[0183] See Figures 1 to 8 The cover assembly 11 may also include a fastening assembly, a rotating frame 132, a transmission connector 133, and a drive motor 134.

[0184] The fastening assembly is movably disposed on the cover body 110 between a locked position and an unlocked position along the radial direction of the inner cover 113. The fastening assembly includes a fastening element 131 and a guide connector 137. When the fastening assembly is in the locked position, the fastening element 131 is also in the locked position (e.g., ...). Figure 6 As shown), the fastening element 131 locks the inner cover 113 and the inner pot 101 to prevent the inner cover 113 from separating from the inner pot 101 when pressed. When the fastening assembly is in the unlocked position, the fastening element 131 is also in the unlocked position (as shown). Figure 7As shown, the fastener 131 disengages at least from the inner pot 101 to unlock the inner lid 113 from the inner pot 101, thereby allowing the lid assembly 11 to move from a closed position to an open position. The fastener 131 may include a clamping opening for receiving the edges of the inner pot 101 and the inner lid 113. When the fastener 131 is in the locked position, the edges of the inner pot 101 and the inner lid 113 are clamped in the clamping opening to limit the inner pot 101 and the inner lid 113 in the height direction Z of the pressure cooker, thereby preventing the inner pot 101 and the inner lid 113 from disengaging from each other and ensuring that the cooking space can be pressurized. When the fastener 131 is in the unlocked position, the clamping opening disengages from at least one of the edges of the inner pot 101 and the inner lid 113. Preferably, the fastener 131 in the unlocked position disengages from the inner pot 101.

[0185] The rotating bracket 132 is rotatably mounted on the lid body 110 about a first axis AX1. When the lid assembly 11 is closed onto the pot body assembly 10, the first axis AX1 is parallel to or nearly parallel to the height direction Z of the lid assembly 11. The rotating bracket 132 includes a guide hole 1321 for connecting a guide connector 137. The guide hole 1321 includes a drive segment 13211 extending along a drive trajectory. The extension direction of the drive segment 13211 is inclined radially to the circle centered on the first axis AX1. The drive segment 13211 has opposite first and second ends. The distance between the first end of the drive segment 13211 and the first axis AX1 is less than the distance between the second end of the drive segment 13211 and the first axis AX1. The radial dimension of the drive segment 13211 is equal to the distance the fastener 131 moves radially. The angle between the tangent of the circle centered on the first axis AX1 and the line connecting the two ends of the drive trajectory at any point on the drive trajectory is as follows: Figure 9 As shown, α ≠ 0° and α ≠ 90°. During the rotation of the rotating frame 132 about the first axis AX1 in the first rotation direction RO1, the guide connector 137 moves towards the second end of the drive section 13211, causing the fastening assembly to move towards the unlocked position. During the rotation of the rotating frame 132 about the first axis AX1 in the second rotation direction RO2, the guide connector 137 moves towards the first end of the drive section 13211, causing the fastening assembly to move towards the locked position. The first rotation direction RO1 is opposite to the second rotation direction RO2. Viewed from a top view of the cover assembly 11, the first rotation direction RO1 can be counterclockwise, and the second rotation direction RO2 can be clockwise. One end of the transmission connector 133 is movably connected to the rotating frame 132.

[0186] The drive motor 134 is located outside the rotating frame 132. The shortest distance between the drive motor 134 and the first axis AX1 is greater than the radius of the rotation trajectory of the rotating frame 132. That is, the drive motor 134 is located radially outside the rotating frame 132 in a circle centered on the first axis AX1, and is spaced apart from the rotating frame 132. The motor shaft of the drive motor 134 is fixedly connected to the other end of the transmission connector 133. The axis of the motor shaft is parallel to the first axis AX1. When the drive motor 134 operates, the motor shaft drives the transmission connector 133 to rotate around the axis of the motor shaft, causing the end of the transmission connector 133 furthest from the motor shaft to oscillate around the axis of the motor shaft, thereby driving the rotating frame 132 to rotate. The rotation direction of the motor shaft is opposite to the rotation direction of the rotating frame 132. The axis of the motor shaft can be the second axis AX2.

[0187] See Figures 1 to 10 The rotating frame 132 includes a trigger portion 1323. The trigger portion 1323 can be configured as a boss extending radially from the outer edge of the rotating frame 132 along a first axis AX1. A position detection device 140 is used to detect the position signal of the trigger portion 1323. The position detection device 140 includes a locked position detection device 141 and an unlocked position detection device 142. The locked position detection device 141 and the unlocked position detection device 142 are located circumferentially on both sides of the trigger portion 1323, centered on the first axis AX1. The locked position detection device 141 generates a locked position signal when the rotating frame 132 rotates to a position where the fastener 131 moves to the locked position. The unlocked position detection device 142 generates an unlocked position signal when the rotating frame 132 rotates to a position where the fastener 131 moves to the unlocked position. The locked position detection device 141 and the unlocked position detection device 142 can each be a limit switch or a position sensor. The locked position detection device 141 and the unlocked position detection device 142 are each electrically connected to a control unit 152. The control unit 152 is configured to control the operating state of the drive motor 134 based on the locked position signal detected by the locked position detection device 141 and the unlocked position signal detected by the unlocked position detection device 142. The operating state of the drive motor 134 includes rotation and stopping of the motor shaft. (See also...) Figure 3 and Figure 6 Optionally, the drive motor 134 can drive the transmission connector 133 to rotate along the second rotation direction RO2 to the first limit position P1, thereby causing the rotating frame 132 to rotate to the position shown in the image. Figure 7 and Figure 10 The third extreme position shown causes the fastener 131 to move to the unlocked position. When the rotating frame 132 rotates to the position shown... Figure 7 and Figure 10At the third extreme position shown, the trigger part 1323 on the rotating frame 132 is detected by the unlocking position detection device 142, thereby generating an unlocking position signal and sending it to the control unit 152. The control unit 152 determines that the fastening member 131 is in the unlocked position based on the unlocking position signal. The drive motor 134 can drive the transmission connecting member 133 to rotate along the first rotation direction RO1 to the second extreme position P2, thereby causing the rotating frame 132 to rotate to the third extreme position shown. Figure 6 The fourth extreme position shown causes the fastener 131 to move to the locked position. When the rotating frame 132 rotates to the position shown... Figure 6 At the fourth extreme position shown, the trigger part 1323 on the rotating frame 132 is detected by the locking position detection device 141, thereby generating a locking position signal and sending it to the control unit 152. The control unit 152 determines that the fastener 131 is in the locked position based on the locking position signal. The locking position detection device 141 and the unlocking position detection device 142 can each be composed of position sensors such as microswitches, reed switches, optocouplers, and capacitive sensors. The position sensors selected for the locking position detection device 141 and the unlocking position detection device 142 can be the same or different. The locking position detection device 141 and the unlocking position detection device 142 can be fixed to the cover 112 by means of snap-fit, heat fusion, or screws. The cooking appliance can be equipped with either the locking position detection device 141 or the unlocking position detection device 142. In the example where the cooking appliance is equipped with only one position detection device, the locking position detection device 141 is preferably provided.

[0188] See Figure 8 The fastening member 131 may include a first fastening portion 1312, a second fastening portion 1313, and a connecting portion 1314. The connecting portion 1314 connects between the first fastening portion 1312 and the second fastening portion 1313. Specifically, both ends of the connecting portion 1314 are connected to the ends of the first fastening portion 1312 and the second fastening portion 1313 that are away from the cooking space. The first fastening portion 1312, the second fastening portion 1313, and the connecting portion 1314 together form a clamping opening facing the first axis AX1. The clamping opening is used to accommodate the edge of the inner lid 113 and the edge of the pot liner 101. The first fastening portion 1312 is used to restrict the upward movement of the inner lid 113 when pressed in the cooking space. The second fastening portion 1313 is used to restrict the downward movement of the pot liner 101 when pressed in the cooking space.

[0189] See Figures 3 to 7 , Figure 9 as well as Figure 10Furthermore, the rotating frame 132 has a transmission hole 1324. The transmission connector 133 also has a connecting shaft 1331. The connecting shaft 1331 is inserted into the transmission hole 1324. The transmission hole 1324 provides a clearance that allows the connecting shaft 1331 to move radially relative to the rotating frame 132. For example, the transmission hole 1324 can be configured as an elongated hole extending radially in a circle centered on the first axis AX1, to allow the connecting shaft 1331 to move within the transmission hole 1324, thereby preventing jamming of the rotation of the rotating frame 132 and the rotation of the transmission connector 133. The transmission hole 1324 can be a through hole or a blind hole. The transmission hole 1324 is located at the edge of the rotating frame 132. While the connecting shaft 1331 rotates about the second axis AX2 and drives the rotating frame 132 to rotate, it can slide or move within the transmission hole 1324 along its length.

[0190] See Figure 3 , Figure 6 , Figure 7 as well as Figure 10 Furthermore, the rotating frame 132 also includes a drive boss 1325. The drive boss 1325 has an engaged state that engages with the lid locking assembly 160 and a disengaged state that disengages from the lid locking assembly 160. In the engaged state, the drive boss 1325 prevents external force from successfully pressing the button assembly 103, thereby preventing the lid assembly 11 from being opened. In the disengaged state, the drive boss 1325 allows external force to successfully press the button assembly 103, thereby allowing the lid assembly 11 to be opened under the elastic force of the lid opening torsion spring 104. Specifically, when the lid assembly 11 is closed on the pot body assembly 10, when the rotating frame 132 rotates along the second rotation direction RO2 (the motor shaft rotates in the first rotation direction RO1) to such a state... Figure 6 At the fourth extreme position shown, the fastener 131 moves to the locked position, and the transmission boss 1325 engages with the lid locking assembly 160. With the lid assembly 11 closed on the pot body assembly 10, when the rotating frame 132 rotates along the first rotation direction RO1 (the motor shaft rotates in the second rotation direction RO2) to the position shown... Figure 7 At the third extreme position shown, the fastener 131 moves to the unlocked position, and the transmission boss 1325 separates from the cover locking assembly 160. It should be noted that the rotating bracket 132 rotates freely. Figure 7 Rotate to the third extreme position as shown Figure 6 The angle of the fourth extreme position shown is less than or equal to the central angle of the circle centered on the first axis AX1 of the guide hole 1321. The central angle of the circle centered on the first axis AX1 of the transmission boss 1325 can be less than or equal to the central angle of the guide hole 1321.

[0191] See Figures 3 to 7 , Figure 9 as well as Figure 10 Optionally, the cover 112 has a float mounting hole (not shown). A float component 136 is installed in the float mounting hole. A rotating frame 132 is located between the cover 112 and the top cover 111. The rotating frame 132 has a limiting hole 13209. When the fastener 131 is in the locked position, the limiting hole 13209 and the float mounting hole are aligned. When the cooking space is pressed up, the float component 136 moves upward and inserts into the limiting hole 13209. At this time, the float component 136 is connected to the float mounting hole and the limiting hole 13209, which can prevent the rotating frame 132 from rotating. This can prevent the rotating frame 132 from rotating when the cooking space is pressed up. When the cooking space is under normal pressure, the float component 136 disengages from the limiting hole 13209. At this time, the rotating frame 132 can rotate relative to the cover 112.

[0192] See Figures 11 to 13 This application provides a circuit structure for a cooking appliance. This circuit structure can be implemented in any form. For example, the circuit structure can be integrated on a single circuit board, distributed across different circuit boards, or a portion of the circuit structure may be on a circuit board while another portion is not. The circuit structure may include a control unit 152, a mains power detection circuit 151, a battery storage device 158, and a motor drive circuit 153.

[0193] One end of the mains power detection circuit 151 is electrically connected to the control unit 152 to supply power to the control unit 152. The other end of the mains power detection circuit 151 is adapted to be connected to mains power.

[0194] The energy storage device 158 is electrically connected to the control unit 152 to supply power to the control unit 152. The energy storage device 158 is used to store and release electrical energy. The energy storage device 158 is adapted to be electrically connected to the drive motor 134 to supply power to the drive motor 134.

[0195] One end of the motor drive circuit 153 is electrically connected to the control unit 152. The other end of the motor drive circuit 153 is adapted to be electrically connected to the drive motor 134.

[0196] Control unit 152 is configured as follows:

[0197] The voltage at the output terminal of the mains power detection circuit 151 is detected, and it is determined whether the voltage at the output terminal of the mains power detection circuit 151 is zero.

[0198] If the voltage at the output terminal of the mains power detection circuit 151 is not zero, then electrical energy is supplied to the energy storage device 158 to charge the energy storage device 158. Here, the non-zero voltage at the output terminal of the mains power detection circuit 151 can be understood as the circuit structure being connected to the mains power, and the circuit structure being in a powered-on or energized state.

[0199] If the voltage at the output of the mains power detection circuit 151 is zero, then electrical energy is obtained from the energy storage device 158, and the motor drive circuit 153 is turned on to make the drive motor 134 work. Here, the zero voltage at the output of the mains power detection circuit 151 can be understood as the circuit structure being disconnected from the mains power, and the circuit structure is in a power-off state.

[0200] According to the circuit structure of the embodiment of this application, the power is turned off by detecting and judging whether the voltage at the output terminal of the mains power detection circuit 151 is zero. The energy storage device 158 is charged when the mains power detection circuit 151 is powered on, and supplies power to the control unit 152 and the drive circuit when the mains power detection circuit 151 is powered off. Thus, the power of the energy storage device 158 can be used to control the motor drive circuit 153 to work when the power is off, and the motor drive circuit 153 can be connected to the drive motor 134 to control the drive motor 134 to work.

[0201] Furthermore, if the voltage at the output of the mains power detection circuit 151 is zero, the control unit 152 sequentially supplies starting current and running current to the motor drive circuit 153. The starting current is greater than the running current. The starting current is used to start the drive motor 134. The running current is used for the operation of the drive motor 134 after it starts.

[0202] According to this application, when the mains power detection circuit 151 detects a power outage, the motor drive circuit 153 first supplies a starting current to the drive motor 134 to meet the larger current demand of the drive motor 134 during startup. Then, the motor drive circuit 153 supplies a running current to the drive motor 134 to meet the smaller current demand of the drive motor 134 when maintaining operation. Since the starting current and running current are supplied to the drive motor 134 sequentially, the current required by the drive motor 134 during startup and operation can be rationally allocated. Compared to always supplying power with the starting current, this effectively saves energy, thereby improving the energy utilization rate of the energy storage device 158 in the event of a power outage.

[0203] For example, the motor drive circuit 153 may include a first drive circuit 153a and a second drive circuit 153b. One end of the first drive circuit 153a is electrically connected to the control unit 152. The other end of the first drive circuit 153a is adapted to be electrically connected to the drive motor 134. The first drive circuit 153a supplies starting current. One end of the second drive circuit 153b is electrically connected to the control unit 152. The other end of the second drive circuit 153b is adapted to be electrically connected to the drive motor 134. The second drive circuit 153b supplies operating current.

[0204] Control unit 152 is configured as follows:

[0205] If the voltage at the output of the mains power detection circuit 151 is zero, then one of the first drive circuit 153a and the second drive circuit 153b is selectively turned on in sequence to make the drive motor 134 work.

[0206] According to this application, when the first drive circuit 153a is connected to the drive motor 134, the drive motor 134 is powered by the starting current through the first drive circuit 153a to meet the larger current requirement of the drive motor 134 during startup. When the second drive circuit 153b is connected to the drive motor 134, the drive motor 134 is powered by the running current through the second drive circuit 153b to meet the smaller current requirement of the drive motor 134 when it is running. Furthermore, the first drive circuit 153a and the second drive circuit 153b are connected sequentially and not simultaneously. This allows for a reasonable allocation of the current required by the drive motor 134 during startup and operation, effectively saving energy compared to always using the startup current, thereby improving the energy utilization rate of the energy storage device 158 in the event of a power outage.

[0207] Optionally, the first driving circuit 153a and the second driving circuit 153b each include a first base voltage divider resistor, a second base voltage divider resistor, and a transistor. One end of the first base voltage divider resistor is electrically connected to the control unit. The other end of the first base voltage divider resistor is electrically connected to the base of the transistor. One end of the second base voltage divider resistor is electrically connected to the base of the transistor. The other end of the second base voltage divider resistor and the emitter of the transistor are both grounded. The collector of the transistor is electrically connected to the drive motor.

[0208] According to this application, the base of the first transistor is powered by a voltage divider resistor (first base voltage divider resistor and second base voltage divider resistor), and the control unit supplies power to the drive motor by controlling the transistor to conduct. When the transistor is conducting, a current greater than the base current can be supplied to the drive motor. In some embodiments, the first drive circuit and the second drive circuit can be composed of identical circuits, but the control unit controls the output currents of the two drive circuits to be different.

[0209] Optionally, such as Figure 11 and Figure 13 As shown, in the first driving circuit 153a, the first base voltage divider resistor is the seventh resistor R7, the second base voltage divider resistor is the eighth resistor R8, and the transistor is the first transistor Q1. Figure 11 As shown, in the second driving circuit 153b, the first base voltage divider resistor is the fifth resistor R5, the second base voltage divider resistor is the sixth resistor R6, and the transistor is the second transistor Q2.

[0210] According to this application, the base of the first transistor Q1 is powered by a voltage divider formed by the seventh resistor R7 and the eighth resistor R8. When the first transistor Q1 is turned on, the current is amplified and supplied to the connected drive motor 134. Similarly, the base of the second transistor Q2 is powered by a voltage divider formed by the fifth resistor R5 and the sixth resistor R6. When the second transistor Q2 is turned on, the current is amplified and supplied to the connected drive motor 134.

[0211] Optionally, the resistance values ​​of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are below 10KΩ.

[0212] Optionally, the first driving circuit 153a may further include a third capacitor C3. The third capacitor C3 is connected in parallel with the eighth resistor R8. The second driving circuit 153b may further include a fourth capacitor C4. The fourth capacitor C4 is connected in parallel with the sixth resistor R6.

[0213] According to this application, the first transistor Q1 is protected by adding a third capacitor C3 to filter interference signals. The second transistor Q2 is protected by adding a fourth capacitor C4 to filter interference signals.

[0214] Optionally, the resistance of the seventh resistor R7 is the same as that of the fifth resistor R5. The resistance of the eighth resistor R8 is the same as that of the sixth resistor R6. The amplification factor of the second transistor Q2 is less than that of the first transistor Q1.

[0215] According to this application, the current output by the first drive circuit 153a is greater than the current output by the second drive circuit 153b. This allows the first drive circuit 153a to supply the starting current and the second drive circuit 153b to supply the operating current.

[0216] Optionally, the amplification factor of the first transistor Q1 is greater than or equal to twice the amplification factor of the second transistor Q2.

[0217] According to this application, the current output by the first driving circuit 153a is greater than or equal to twice the current output by the second driving circuit 153b.

[0218] Preferably, the first transistor Q1 is a 9013, with a gain of approximately 160. The second transistor Q2 is an 8050, with a gain of approximately 80.

[0219] Besides the two driving circuits mentioned above that change the output current by selecting different transistors, the resistance can also be changed. For example, the transistor in the first driving circuit 153a has the same amplification factor as the transistor in the second driving circuit 153b. Figure 11 and Figure 13As shown, the transistor in the first driving circuit 153a is the first transistor Q1, and the transistor in the second driving circuit 153b is the second transistor Q2.

[0220] The first base voltage divider resistor of the first driving circuit 153a is the first start-up voltage divider resistor. The second base voltage divider resistor of the first driving circuit 153a is the second start-up voltage divider resistor. For example... Figure 11 and Figure 13 As shown, the first starting voltage divider resistor is the seventh resistor R7, and the second starting voltage divider resistor is the eighth resistor R8.

[0221] The first base voltage divider resistor of the second drive circuit 153b is the first operating voltage divider resistor. The second base voltage divider resistor of the second drive circuit 153b is the second operating voltage divider resistor. For example... Figure 11 As shown, the first operating voltage divider resistor is the fifth resistor R5, and the second operating voltage divider resistor is the sixth resistor R6.

[0222] The ratio of the resistance of the second starting voltage divider resistor to the sum of the resistances of the first starting voltage divider resistor and the second starting voltage divider resistor is greater than the ratio of the resistance of the second running voltage divider resistor to the sum of the resistances of the first running voltage divider resistor and the second running voltage divider resistor.

[0223] According to this application, when the amplification factor of the transistor in the first driving circuit 153a is the same as that of the transistor in the second driving circuit 153b, by reasonably allocating the proportion of the second base voltage divider resistor in the first driving circuit 153a and the second driving circuit 153b to the sum of the resistance values ​​of the first base voltage divider resistor and the second base voltage divider resistor, the resistance value of the second base voltage divider resistor in the first driving circuit 153a is made to account for a larger proportion of the sum of the resistance values ​​of the first base voltage divider resistor and the second base voltage divider resistor, thereby achieving the purpose of the first driving circuit 153a outputting the starting current and the second driving circuit 153b outputting the operating current.

[0224] Furthermore, the ratio of the resistance of the second starting voltage divider resistor to the sum of the resistances of the first starting voltage divider resistor and the second starting voltage divider resistor is greater than or equal to 1.5 times the ratio of the resistance of the second operating voltage divider resistor to the sum of the resistances of the first operating voltage divider resistor and the second operating voltage divider resistor.

[0225] According to this application, by setting it up in this way, the base current of the first driving circuit 153a can be greater than or equal to 1.5 times the base current of the second driving circuit 153b, thereby achieving that the output current of the first driving circuit 153a is greater than or equal to 1.5 times the output current of the second driving circuit 153b.

[0226] For example, the control unit 152 is configured to:

[0227] If the output voltage of the mains power detection circuit is zero, the motor drive circuit 153 is controlled to operate sequentially during the start-up period and the maintenance operation period. A start-up pulse width modulation (PWM) signal is input to the motor drive circuit 153 during the start-up period, and a maintenance operation PWM signal is input to the motor drive circuit 153 during the maintenance operation period. The start-up period and the maintenance operation period are sequentially continuous, and the duty cycle of the start-up PWM signal is greater than the duty cycle of the maintenance operation PWM signal. The motor drive circuit 153 may consist of only one motor drive circuit. For example, the motor drive circuit 153 may be the first drive circuit 153a or the second drive circuit 153b described above.

[0228] According to this application, by first inputting a pulse width modulation signal with a large duty cycle into the motor drive circuit 153, the motor drive circuit 153 is controlled to output a starting current, and then a pulse width modulation signal with a small duty cycle is input into the motor drive circuit 153, the motor drive circuit 153 is controlled to output an operating current.

[0229] Optionally, the duty cycle of the start pulse width modulation signal is greater than or equal to 2.5 times the duty cycle of the maintain operation pulse width modulation signal.

[0230] According to this application, by ensuring that the pulse width modulation signal first input to the motor drive circuit 153 is greater than or equal to 2.5 times the pulse width modulation signal input later, the motor drive circuit 153 is controlled to output the starting current and the running current sequentially.

[0231] Optionally, the mains power detection circuit 151 may include a mains power input terminal, a first voltage divider resistor 151a, a second voltage divider resistor 151b, and a third diode D3. One end of the first voltage divider resistor 151a is electrically connected to the mains power input terminal. The other end of the first voltage divider resistor 151a is electrically connected to one end of the second voltage divider resistor 151b. The other end of the second voltage divider resistor 151b is grounded. The resistance value of the second voltage divider resistor 151b is less than the resistance value of the first voltage divider resistor 151a. One end of the third diode D3 is used to connect to direct current (DC). The DC power can be obtained by regulating, rectifying, and filtering the mains power through a power supply processing circuit; preferably, it is +5V DC power. The control unit 152 is electrically connected between the first voltage divider resistor 151a and the second voltage divider resistor 151b to obtain the ground potential or ground voltage of the second voltage divider resistor 151b between the first voltage divider resistor 151a and the second voltage divider resistor 151b. The third diode D3 is used to clamp the voltage to ground of the second voltage divider resistor 151b to a voltage not exceeding the rated input voltage of the control unit 152, so as to protect the control unit 152.

[0232] Control unit 152 is configured as follows:

[0233] The voltage at the output of the mains power detection circuit 151 is determined to be zero based on whether the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is zero. If the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is zero, then the voltage at the output of the mains power detection circuit 151 is determined to be zero. If the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is not zero, then the voltage at the output of the mains power detection circuit 151 is determined to be non-zero.

[0234] According to this application, a voltage divider is formed between the mains power and ground by the first voltage divider resistor 151a and the second voltage divider resistor 151b, and the voltage at the output terminal of the mains power detection circuit 151 is determined to be zero by detecting and judging whether the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is zero, thereby determining whether a power outage has occurred.

[0235] Optionally, the ratio of the resistance of the second voltage divider resistor 151b to the sum of the resistances of the first voltage divider resistor 151a and the second voltage divider resistor 151b is greater than or equal to 0.004. Furthermore, the ratio of the resistance of the second voltage divider resistor 151b to the sum of the resistances of the first voltage divider resistor 151a and the second voltage divider resistor 151b is less than or equal to 0.02. The first voltage divider resistor 151a is composed of... Figures 11 to 13 The first resistor R1, the second resistor R2, and the third resistor R3 are connected in series. The resistance of each of the first resistor R1, the second resistor R2, and the third resistor R3 is above 200KΩ. The resistance of the fourth resistor R4 is below 10KΩ. The second voltage divider resistor 151b is... Figures 11 to 13 The fourth resistor in the circuit is R4.

[0236] It is understandable that the first voltage divider resistor 151a can be a single resistor, or it can be two or more resistors connected in series.

[0237] like Figures 11 to 13 As shown, the circuit structure can also include a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected in parallel with the third resistor R3. The second capacitor C2 is connected in parallel with the fourth resistor. The capacitance of the first capacitor C1 and the second capacitor C2 is less than 200nF.

[0238] The first diode D1 and the second diode D2 are connected to the mains power for rectification. The voltage is then divided by the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, and filtered by the first capacitor C1 and the second capacitor C2. This voltage is then connected to the analog-to-digital converter port of the chip IC101, which serves as the control unit 152, to measure the mains voltage. The third diode D3 is connected to a 5V voltage source, obtained from the mains power via a transformer. When the mains voltage is very high, even if the voltage connected to the chip IC101 after the voltage division by the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 exceeds the rated voltage of the chip IC101 (approximately 7V), the third diode D3 can clamp the voltage connected to the chip IC101, controlling it to around 4.3V.

[0239] When the power is off, the voltage after the voltage is divided by the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 is 0. When the chip IC101 detects a voltage of 0, it can know that the mains power is off.

[0240] like Figure 11 As shown, in the mains power supply circuit 157, the first diode D1 and the second diode D2 form a rectifier bridge 157a connected to the mains power for rectification. The sixth diode D6 is used for unidirectional conduction to prevent current from flowing back into the mains detection circuit 151. The first voltage regulator 157c and the second voltage regulator 157d perform voltage regulation in sequence to finally obtain 5V DC power.

[0241] If the mains power fails, the 5V DC power disappears. Capacitors C5 and C6 are fully charged by the 5V from the mains power supply circuit 157 when mains power is available. Even if the mains power fails, capacitors C5 and C6 still have charge, with a voltage of 5V_C. 5V_C and the 5V from the mains power supply circuit are separated by the fourth diode D4, so 5V_C is not connected to 5V, while 5V powers other external circuits. This separation prevents 5V_C from powering unnecessary external circuits, reducing power consumption. The program also operates abnormally, only running the programs for detecting voltage and controlling the drive motor and electric pressure relief device. Other programs, such as display, cooking, and voice functions, which are unrelated to controlling the drive motor and electric pressure relief device, are not run. Furthermore, the program switches from a higher frequency to a lower frequency to further reduce power consumption.

[0242] For example, the energy storage device 158 may include an energy storage element. The energy storage device 158 may be a single energy storage element or may include two or more energy storage elements.

[0243] According to this application, the energy storage device 158 specifically achieves energy storage and discharge through energy storage elements.

[0244] For example, the energy storage device 158 may include at least two energy storage elements. The energy storage elements are connected in parallel.

[0245] According to this application, since the energy storage device 158 includes parallel energy storage elements, this helps to improve the energy storage capacity of the energy storage device 158, thereby enabling it to supply electrical energy for a longer period of time during power outages. When the energy storage elements are capacitors, at least two capacitors with smaller capacitances can be connected in parallel to obtain a larger capacitance. Compared to using a single, larger capacitor with the same capacitance, this reduces the size of a single capacitor.

[0246] In some cases, the energy storage element is a capacitor or a battery.

[0247] According to this application, the energy storage element can be either a capacitor or a battery, thus increasing the flexibility in selecting the energy storage element.

[0248] In the illustrated example, the energy storage element is a capacitor. Energy storage device 158 includes two capacitors: a fifth capacitor C5 and a sixth capacitor C6, which are connected in parallel. The capacitance of both capacitors C5 and C6 is greater than 500 pF.

[0249] In the case where the energy storage element is a battery, the total capacity of the energy storage element is above 500mAh.

[0250] Exemplarily, the circuit structure may include a fourth diode D4 and an external circuit. A first terminal of the energy storage device 158 is connected to the external circuit via the fourth diode D4. The fourth diode D4 is configured to cut off when current flows from the energy storage device 158 to the external circuit. The external circuit here may include… Figure 11 , Figure 13 The temperature measuring circuit 156, the mains power supply circuit 157, and the display component DISP1 are shown. The temperature measuring circuit 156 includes a top temperature measuring circuit 156a and a bottom temperature measuring circuit 156b.

[0251] According to this application, by setting a diode between the energy storage device 158 and the external circuit, it is possible to prevent power supply to the external circuit in the power-off state, that is, to cut off the electrical connection with the external circuit, so that the external circuit does not work, thereby reducing power consumption and achieving the purpose of saving the power of the energy storage device 158. This is conducive to making full use of the power in necessary devices or circuits such as the control unit 152 and the drive motor 134.

[0252] For example, the circuit structure may include a pressure relief drive circuit 154. One end of the pressure relief drive circuit 154 is electrically connected to the control unit 152. The other end of the pressure relief drive circuit 154 is adapted to be electrically connected to the electric pressure relief device 120.

[0253] Control unit 152 is configured as follows:

[0254] If the voltage at the output of the mains power detection circuit 151 is zero, then electrical energy is obtained from the energy storage device 158, and the pressure relief drive circuit 154 is turned on to make the electric pressure relief device 120 work.

[0255] According to this application, the pressure relief drive circuit 154 can be controlled to release pressure in the power-off state, thereby reducing the pressure in the cooking space and thus reducing safety risks.

[0256] Optionally, such as Figure 11 As shown, the pressure relief drive circuit 154 includes a ninth resistor R9, a tenth resistor R10, a third transistor Q3, and a seventh capacitor C7. The ninth resistor R9 is connected between the control unit 152 and the base of the third transistor Q3. One end of the tenth resistor R10 is connected to the base of the third transistor Q3. The other end of the tenth resistor R10 and the emitter of the third transistor Q3 are grounded. The collector of the third transistor Q3 is connected to the second connector CN2, which is used to connect the electric pressure relief device 120. The third transistor Q3 can be a 9013, 8050, or other transistors. The fifth capacitor C5 is connected between the base of the third transistor Q3 and ground.

[0257] The aforementioned drive motor 134 is connected to the lid locking and unlocking assembly to provide power to the lid locking and unlocking assembly, enabling the lid to lock and unlock the pot body. In the power-off state, if the pressure inside the cooking space exceeds the safe pressure, it is necessary to depressurize the cooking space to ensure safety. Typically, the operation of the electric pressure relief device 120 is first controlled according to the pressure state inside the cooking space. Once the pressure inside the cooking space is ensured to be equal to or lower than the safe pressure, the drive motor 134 is then controlled to operate, causing the lid locking and unlocking assembly to switch from the locked state to the unlocked state.

[0258] In addition, the circuit structure may also include a display component DISP1. The display component DISP1 is electrically connected to the control unit 152 and the battery storage unit 158. The display component DISP1 here may be, for example, a digital tube, a display screen, or a display module.

[0259] Control unit 152 is configured as follows:

[0260] If the voltage at the output of the mains power detection circuit 151 is zero, the control display component DISP1 will display a reminder message.

[0261] According to this application, a display component DISP1 is added, and a reminder message is displayed through the display component DISP1 in the power-off state to remind the user.

[0262] In addition, the circuit structure may also include a buzzer BZ1. The buzzer BZ1 is electrically connected to the control unit 152 and the energy storage device 158.

[0263] Control unit 152 is configured as follows:

[0264] If the voltage at the output of the mains power detection circuit 151 is zero, then the buzzer BZ1 will sound.

[0265] According to this application, a buzzer BZ1 is added, and the buzzer BZ1 sounds to remind the user when the power is off.

[0266] In addition, such as Figure 11 As shown, the first connector CN1 is used to connect to the drive motor 134. The third connector CN3 is used for the top temperature detection device to obtain the temperature at the top of the cooking space. The fourth connector CN4 is used for the bottom temperature detection device to obtain the temperature at the bottom of the cooking space.

[0267] The cooking appliance provided in the embodiments of this application may include a lid locking and unlocking assembly and the circuit structure described above. The lid locking and unlocking assembly is movably disposed on the lid assembly. The lid locking and unlocking assembly has a locked state that locks the inner pot 101 of the pot body assembly 10 to the lid, and an unlocked state that unlocks the inner pot 101 from the lid assembly 11. The lid locking and unlocking assembly includes a fastening assembly, a rotating bracket 132, and a transmission connector 133. When the fastening assembly is in the locked position, the lid locking and unlocking assembly is in the locked state. When the fastening assembly is in the unlocked position, the lid locking and unlocking assembly is in the unlocked state. A drive motor 134 is drivenly connected to the lid locking and unlocking assembly. A battery 158 is connected to the drive motor 134. The other end of the motor drive circuit 153 is electrically connected to the drive motor 134. A control unit 152 is electrically connected to the drive motor 134. The control unit 152 is configured to control the drive motor 134 to operate, thereby causing the lid locking and unlocking assembly to switch between the locked state and the unlocked state.

[0268] According to the cooking appliance of this application, in the power-off state, the power of the storage device 158 can be used to control the operation of the drive motor 134, thereby changing the state of the lid locking and unlocking assembly, so as to realize the locking and unlocking of the lid assembly 11 and the inner pot 101.

[0269] See Figure 14 This application provides a control method for a cooking appliance. The cooking appliance includes the circuit structure described above. The control method may include:

[0270] The voltage at the output terminal of the mains power detection circuit 151 is detected, and it is determined whether the voltage at the output terminal of the mains power detection circuit 151 is zero.

[0271] If the voltage at the output terminal of the mains power detection circuit 151 is not zero, then electrical energy is supplied to the energy storage device 158;

[0272] If the voltage at the output of the mains power detection circuit 151 is zero, then electrical energy is obtained from the energy storage device 158, and the motor drive circuit 153 is turned on to make the drive motor 134 work.

[0273] According to the control method of the embodiments of this application, the power outage is determined by detecting and judging whether the voltage at the output terminal of the mains power detection circuit 151 is zero. When the mains power detection circuit 151 is powered on, the energy storage device 158 is charged. When the power is off, the energy storage device 158 can be used to control the operation of the drive circuit. Furthermore, when the drive circuit is connected to the drive motor 134, the drive motor 134 can be controlled to operate.

[0274] Optionally, if the voltage at the output of the mains power detection circuit 151 is zero, the control unit 152 sequentially supplies the starting current and the running current to the motor drive circuit 153. The starting current is greater than the running current.

[0275] According to this application, when the mains power detection circuit 151 detects a power outage, the motor drive circuit 153 first supplies a starting current to the drive motor 134 to meet the larger current demand of the drive motor 134 during startup. Then, the motor drive circuit 153 supplies a running current to the drive motor 134 to meet the smaller current demand of the drive motor 134 when maintaining operation. Since the starting current and running current are supplied to the drive motor 134 sequentially, the current required by the drive motor 134 during startup and operation can be rationally allocated. Compared to always supplying power with the starting current, this effectively saves energy, thereby improving the energy utilization rate of the energy storage device 158 in the event of a power outage.

[0276] Optionally, the motor drive circuit 153 may include a first drive circuit 153a and a second drive circuit 153b. One end of the first drive circuit 153a is electrically connected to the control unit 152. The other end of the first drive circuit 153a is adapted to be electrically connected to the drive motor 134. The first drive circuit 153a supplies starting current. One end of the second drive circuit 153b is electrically connected to the control unit 152. The other end of the second drive circuit 153b is adapted to be electrically connected to the drive motor 134. The second drive circuit 153b supplies operating current.

[0277] Control methods include:

[0278] If the voltage at the output of the mains power detection circuit 151 is zero, then the first drive circuit 153a is first turned on while the second drive circuit 153b is kept off, and then the first drive circuit 153a is turned off while the second drive circuit 153b is turned on.

[0279] According to this application, when the first drive circuit 153a is connected to the drive motor 134, the drive motor 134 is powered by a larger current through the first drive circuit 153a to meet the energy demand of the drive motor 134 during startup. The drive motor 134 requires a larger current of energy during startup. When the second drive circuit 153b is connected to the drive motor 134, the drive motor 134 is powered by a smaller current through the second drive circuit 153b to meet the energy demand of the drive motor 134 during operation. The energy demand of the drive motor 134 during operation is smaller than that during startup. Moreover, the first drive circuit 153a and the second drive circuit 153b are not connected simultaneously. This allows for a reasonable allocation of the energy required by the drive motor 134 during startup and operation, effectively saving energy compared to the related art where the power is always supplied with the startup current, thereby improving the energy utilization rate of the energy storage device 158 during power outages.

[0280] For example, the circuit structure may include a pressure relief drive circuit 154. One end of the pressure relief drive circuit 154 is electrically connected to the control unit 152. The other end of the pressure relief drive circuit 154 is adapted to be electrically connected to the electric pressure relief device 120.

[0281] Control methods include:

[0282] If the voltage at the output of the mains power detection circuit 151 is zero, then electrical energy is obtained from the energy storage device 158, and the pressure relief drive circuit 154 is turned on to make the electric pressure relief device 120 work.

[0283] According to this application, the pressure relief drive circuit 154 can be controlled to release pressure in the power-off state, thereby reducing the pressure in the cooking space and thus reducing safety risks.

[0284] Furthermore, before controlling the drive motor 134 to work, the operating status of the electric pressure relief device 120 is controlled according to the pressure status in the cooking space.

[0285] For example, first obtain the temperature inside the cooking space, and then determine whether the temperature is greater than the preset temperature.

[0286] If so, first control the electric pressure relief device 120 to work to relieve pressure until the temperature in the cooking space is equal to or less than the preset temperature; then control the drive motor 134 to work to unlock the lid.

[0287] If not, the drive motor 134 is directly controlled to unlock the cover.

[0288] The control unit 152 can determine the pressure value corresponding to a given temperature by consulting a temperature-pressure table within the cooking space. The pressure value corresponding to a preset temperature can be considered a safe pressure. Safe pressure is typically higher than atmospheric pressure.

[0289] Exemplarily, the circuit structure may also include a display component DISP1. The display component DISP1 is electrically connected to the control unit 152 and the battery storage device 158. The control method may include:

[0290] If the voltage at the output of the mains power detection circuit 151 is zero, the control display component DISP1 will display a reminder message, which includes text reminder information.

[0291] According to this application, a reminder message is displayed by controlling the display component DISP1 in the event of a power outage, so as to remind the user.

[0292] Exemplarily, the circuit structure may also include a buzzer BZ1. The buzzer BZ1 is electrically connected to the control unit 152 and the battery storage device 158. The control method may include:

[0293] If the voltage at the output of the mains power detection circuit 151 is zero, then the buzzer BZ1 will sound.

[0294] According to this application, the buzzer BZ1 is controlled to sound in the event of a power outage to alert the user.

[0295] For example, after the buzzer BZ1 sounds for a certain period of time (e.g., 5 seconds), the control unit only runs the program that controls the display component DISP1 to display text and other reminder information, and controls the display component DISP1 to display once every 5 seconds, with each display lasting for, for example, 1 second. It then stops running all other programs and enters a sleep state to reduce power consumption. After entering the sleep state, it wakes up once every certain interval, for example, 1 second, to check if the mains voltage has been restored. If it has not been restored, it continues to sleep. If it has been restored, it controls the drive motor 134 to automatically reset to the unlocked position, and then the cooking program runs normally, switching the operating frequency from a lower frequency back to a higher frequency to improve program efficiency.

[0296] For example, the mains power detection circuit 151 may include a mains power input terminal, a first voltage divider resistor 151a, a second voltage divider resistor 151b, and a third diode D3. One end of the first voltage divider resistor 151a is electrically connected to the mains power input terminal. The other end of the first voltage divider resistor 151a is electrically connected to one end of the second voltage divider resistor 151b. The other end of the second voltage divider resistor 151b is grounded. The resistance value of the second voltage divider resistor 151b is less than the resistance value of the first voltage divider resistor 151a. One end of the third diode D3 is used to connect to a +5V DC power supply. The +5V DC power supply is a DC power supply with a voltage of +5V obtained after processing the mains power supply circuit 157. The control unit 152 is electrically connected between the first voltage divider resistor 151a and the second voltage divider resistor 151b.

[0297] The method for determining whether the voltage at the output terminal of the mains power detection circuit 151 is zero is as follows:

[0298] Based on whether the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is zero, determine whether the voltage at the output terminal of the mains power detection circuit 151 is zero.

[0299] If the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is zero, then the voltage at the output terminal of the mains power detection circuit 151 is determined to be zero.

[0300] If the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is not zero, then it is determined that the voltage at the output terminal of the mains power detection circuit 151 is not zero.

[0301] According to this application, by detecting and judging whether the voltage between the first voltage divider resistor 151a and the second voltage divider resistor 151b is zero, it is determined whether the voltage at the output terminal of the mains power detection circuit 151 is zero, thereby determining whether a power outage has occurred.

[0302] For example, the control method may include:

[0303] If the voltage at the output of the mains power detection circuit 151 is zero, the clock signal switches from the first clock to the second clock. Here, the frequency of the first clock is higher than the frequency of the second clock.

[0304] According to this application, after a power outage is determined, the frequency of program operation is reduced by switching from the first clock to the second clock, which helps to reduce energy consumption.

[0305] For example, the control method may further include:

[0306] After determining that the voltage at the output terminal of the mains power detection circuit 151 is zero, the system detects and judges whether the voltage at the output terminal of the mains power detection circuit 151 is zero.

[0307] If the voltage at the output of the mains power detection circuit 151 is not zero, the clock signal switches from the second clock to the first clock. The frequency of the first clock is higher than that of the second clock.

[0308] According to this application, if power is detected after a power outage, the normal operating frequency is restored by switching from the second clock to the first clock, thereby improving programmable efficiency.

[0309] For example, the control method may include:

[0310] After a first preset time has elapsed while the first drive circuit 153a is turned on and the second drive circuit 153b is turned off, the first drive circuit 153a is turned off and the second drive circuit 153b is turned on.

[0311] According to this application, the second drive circuit 153b is controlled to turn on after the first drive circuit 153a is turned on for a first preset time.

[0312] Optionally, the first preset time is 0.5s to 3s. Preferably, the first preset time is 1s.

[0313] For example, the control method may further include:

[0314] After a second preset time has elapsed between the control of the first drive circuit 153a being disconnected and the control of the second drive circuit 153b being turned on, the system enters a sleep state.

[0315] According to this application, the second drive circuit 153b is turned on and remains in a sleep state for a second preset time to reduce energy consumption.

[0316] Optionally, the second preset time is 3s to 15s. Preferably, the second preset time is 10s.

[0317] For example, starting from the start of the sleep state, the circuit wakes up once every third preset time interval to detect and determine whether the voltage at the output terminal of the mains power detection circuit 151 is zero. If the voltage at the output terminal of the mains power detection circuit 151 is zero, the circuit enters the sleep state again.

[0318] According to this application, by waking the device periodically after it enters a hibernation state to determine whether it is powered on, and then re-entering the hibernation state after confirming that it is not powered on, energy consumption can be reduced.

[0319] Optionally, the third preset time is 0.5s to 3s. Preferably, the third preset time is 1s.

[0320] For example, after depressurization and unlocking are complete, the control unit 152 ceases running all programs and enters a sleep state. It wakes up once every second to check if the mains power has been restored. If the mains voltage is not zero, it indicates that the mains voltage has been restored. If the mains power has not been restored, it continues to sleep. If the mains power is restored, the program runs normally, and the clock frequency is switched from a lower frequency back to a higher frequency to improve program control efficiency.

[0321] Embodiments of this application provide a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed, it implements the control method described above.

[0322] According to the embodiments of this application, a computer-readable storage medium can store a computer program so that, when executed, it can implement the control method described above. By applying the control method described above, it is possible to determine whether the power is off by detecting and judging whether the voltage at the output terminal of the mains power detection circuit 151 is zero. When the mains power detection circuit 151 is energized, it charges the energy storage device 158. When the power is off, it can use the electrical energy of the energy storage device 158 to control the operation of the motor drive circuit. Furthermore, when the motor drive circuit is connected to the drive motor 134, it can control the operation of the drive motor 134.

[0323] According to the control method of the cooking appliance in the embodiments of this application, when the control unit detects a power failure signal, it stores the cooking stage and the power failure time. The electric pressure relief device 120 is intermittently energized at least twice. This significantly reduces the pressure within the cooking space, lowers safety risks, and greatly improves the user experience.

[0324] Upon power restoration, the system first retrieves the cooking function, current cooking stage, and power outage duration before the power failure. It then controls the drive motor 134 to rotate forward for a period to automatically unlock the latch 131. Based on the power outage duration, it determines whether to continue cooking. If so, it checks the cooking stage before the power failure to determine if pressurization is required. If pressurization is needed, it controls the drive motor 134 to rotate in reverse for a period to automatically lock the lid on the latch 131. Simultaneously, it controls the electric pressure relief device 120 to switch to the closed state, blocking the steam passage 1101, to allow pressurization. Then, it continues executing all subsequent cooking stages of the function, starting from the current cooking stage.

[0325] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Terms such as “setup” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0326] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.

Claims

1. A circuit structure for a cooking utensil, characterized in that, The circuit structure includes: Control unit (152); A mains power detection circuit (151) is provided, one end of which is electrically connected to the control unit (152), and the other end is adapted to be connected to the mains power. An energy storage device (158) electrically connected to the control unit (152), the energy storage device (158) for storing and releasing electrical energy, the energy storage device (158) being adapted to be electrically connected to a drive motor (134); and A motor drive circuit (153) is provided, one end of which is electrically connected to the control unit (152), and the other end of which is adapted to be electrically connected to the drive motor (134). The control unit (152) is configured to: The voltage at the output terminal of the mains power detection circuit (151) is detected and determined to be zero. If the voltage at the output terminal of the mains power detection circuit (151) is not zero, then electrical energy is supplied to the energy storage device (158); If the voltage at the output terminal of the mains power detection circuit (151) is zero, then electrical energy is obtained from the energy storage device (158), and the motor drive circuit (153) is turned on to make the drive motor (134) work.

2. The circuit structure according to claim 1, characterized in that, If the voltage at the output terminal of the mains power detection circuit (151) is zero, the control unit (152) sequentially supplies the starting current and the running current to the motor drive circuit, wherein the starting current is greater than the running current.

3. The circuit structure according to claim 2, characterized in that, The motor drive circuit (153) includes: A first drive circuit (153a), one end of which is electrically connected to the control unit (152), and the other end of which is adapted to be electrically connected to the drive motor (134), wherein the first drive circuit (153a) supplies the starting current; and A second drive circuit (153b) is provided, one end of which is electrically connected to the control unit (152), and the other end of which is adapted to be electrically connected to the drive motor (134). The second drive circuit (153b) supplies the operating current. The control unit (152) is configured to: If the voltage at the output of the mains power detection circuit (151) is zero, then one of the first drive circuit (153a) and the second drive circuit (153b) is selectively turned on in sequence to make the drive motor (134) work.

4. The circuit structure according to claim 3, characterized in that, The first driving circuit (153a) and the second driving circuit (153b) each include a first base voltage divider resistor, a second base voltage divider resistor, and a transistor. One end of the first base voltage divider resistor is electrically connected to the control unit (152), and the other end of the first base voltage divider resistor is electrically connected to the base of the transistor. One end of the second base voltage divider resistor is electrically connected to the base of the transistor, and the other end of the second base voltage divider resistor and the emitter of the transistor are both grounded. The collector of the transistor is electrically connected to the driving motor (134).

5. The circuit structure according to claim 4, characterized in that, The first base voltage divider resistor of the first driving circuit (153a) and the first base voltage divider resistor of the second driving circuit (153b) are the same, and the second base voltage divider resistor of the first driving circuit (153a) and the second base voltage divider resistor of the second driving circuit (153b) are the same. The transistor in the first driving circuit (153a) is a first transistor (Q1), and the transistor in the second driving circuit (153b) is a second transistor (Q2). The amplification factor of the first transistor (Q1) is greater than that of the second transistor (Q2).

6. The circuit structure according to claim 5, characterized in that... The amplification factor of the first transistor (Q1) is greater than or equal to twice the amplification factor of the second transistor (Q2).

7. The circuit structure according to claim 4, characterized in that, The amplification factor of the transistor in the first driving circuit (153a) is the same as that of the transistor in the second driving circuit (153b). The first base voltage divider resistor of the first driving circuit (153a) is the first start-up voltage divider resistor, and the second base voltage divider resistor of the first driving circuit (153a) is the second start-up voltage divider resistor. The first base voltage divider resistor of the second driving circuit (153b) is the first operating voltage divider resistor, and the second base voltage divider resistor of the second driving circuit (153b) is the second operating voltage divider resistor; The ratio of the resistance of the second starting voltage divider resistor to the sum of the resistance of the first starting voltage divider resistor and the resistance of the second starting voltage divider resistor is greater than the ratio of the resistance of the second running voltage divider resistor to the sum of the resistance of the first running voltage divider resistor and the resistance of the second running voltage divider resistor.

8. The circuit structure according to claim 7, characterized in that, The ratio of the resistance of the second starting voltage divider resistor to the sum of the resistance of the first starting voltage divider resistor and the resistance of the second starting voltage divider resistor is greater than or equal to 1.5 times the ratio of the resistance of the second operating voltage divider resistor to the sum of the resistance of the first operating voltage divider resistor and the resistance of the second operating voltage divider resistor.

9. The circuit structure according to claim 1, characterized in that, The control unit (152) is configured to: If the voltage at the output terminal of the mains power detection circuit (151) is zero, the motor drive circuit is controlled to work sequentially during the start-up period and the maintenance operation period. A start-up pulse width modulation signal is input to the motor drive circuit during the start-up period, and a maintenance operation pulse width modulation signal is input to the motor drive circuit during the maintenance operation period. The start-up period and the maintenance operation period are sequentially continuous, and the duty cycle of the start-up pulse width modulation signal is greater than the duty cycle of the maintenance operation pulse width modulation signal.

10. The circuit structure according to claim 9, characterized in that, The duty cycle of the start pulse width modulation signal is greater than or equal to 2.5 times the duty cycle of the maintain operation pulse width modulation signal.

11. The circuit structure according to claim 1, characterized in that, The mains power detection circuit (151) includes: AC power input terminal; A first voltage divider resistor (151a) is provided, one end of which is electrically connected to the mains input terminal. A second voltage divider resistor (151b) is connected at one end to the other end of the first voltage divider resistor (151a), and the other end of the second voltage divider resistor (151b) is grounded. The resistance of the second voltage divider resistor (151b) is less than the resistance of the first voltage divider resistor (151a). The third diode (D3), one end of which is connected to a direct current source, The control unit (152) is electrically connected between the first voltage divider resistor (151a) and the second voltage divider resistor (151b). The control unit (152) is configured to: Based on whether the voltage between the first voltage divider resistor (151a) and the second voltage divider resistor (151b) is zero, determine whether the voltage at the output terminal of the mains power detection circuit (151) is zero. If the voltage between the first voltage divider resistor (151a) and the second voltage divider resistor (151b) is zero, then the voltage at the output terminal of the mains power detection circuit (151) is determined to be zero. If the voltage between the first voltage divider resistor (151a) and the second voltage divider resistor (151b) is not zero, then it is determined that the voltage at the output terminal of the mains power detection circuit (151) is not zero.

12. The circuit structure according to claim 1, characterized in that, The energy storage device (158) includes at least two energy storage elements, each of which is connected in parallel.

13. The circuit structure according to claim 1, characterized in that, The energy storage device (158) is a capacitor or a battery.

14. The circuit structure according to claim 1, characterized in that, The circuit structure includes a fourth diode (D4) and an external circuit. The first end of the energy storage device (158) is connected to the external circuit via the fourth diode (D4), which is configured to cut off when current flows from the energy storage device (158) to the external circuit.

15. The circuit structure according to claim 1, characterized in that, The circuit structure includes: A pressure relief drive circuit (154) is provided, one end of which is electrically connected to the control unit (152), and the other end is adapted to be electrically connected to the electric pressure relief device (120). The control unit (152) is configured to: If the voltage at the output terminal of the mains power detection circuit (151) is zero, then electrical energy is obtained from the energy storage device (158), and the pressure relief drive circuit (154) is turned on to make the electric pressure relief device (120) work.

16. The circuit structure according to claim 1, characterized in that, The circuit structure also includes: The display component (DISP1) and / or the buzzer (BZ1) are electrically connected to the control unit (152) and the energy storage device (158). The control unit (152) is configured to: if the voltage at the output of the mains power detection circuit (151) is zero, control the display component (DISP1) to display a reminder message, and / or the buzzer (BZ1) to sound.

17. A control method for a cooking appliance, the cooking appliance comprising the circuit structure according to any one of claims 1 to 16, characterized in that, The control method includes: The voltage at the output of the mains power detection circuit (151) is detected and determined to be zero. If the voltage at the output terminal of the mains power detection circuit (151) is not zero, then electrical energy is supplied to the energy storage device (158); If the voltage at the output terminal of the mains power detection circuit (151) is zero, then electrical energy is obtained from the energy storage device (158) and the motor drive circuit (153) is turned on so that the drive motor (134) can work.

18. The control method according to claim 17, characterized in that, If the voltage at the output terminal of the mains power detection circuit (151) is zero, the control unit (152) sequentially supplies the starting current and the running current to the motor drive circuit, wherein the starting current is greater than the running current.

19. The control method according to claim 18, characterized in that, The motor drive circuit includes: A first drive circuit (153a), one end of which is electrically connected to the control unit (152), and the other end of which is adapted to be electrically connected to the drive motor (134), wherein the first drive circuit (153a) supplies the starting current; and A second drive circuit (153b) is provided, one end of which is electrically connected to the control unit (152), and the other end of which is adapted to be electrically connected to the drive motor (134). The second drive circuit (153b) supplies the operating current. The control method includes: If the voltage at the output of the mains power detection circuit (151) is zero, the first drive circuit (153a) is first turned on while the second drive circuit (153b) is kept off. Then the first drive circuit (153a) is turned off while the second drive circuit (153b) is turned on.

20. The control method according to claim 17, characterized in that, The cooking appliance includes an electric pressure relief device (120). The circuit structure includes: A pressure relief drive circuit (154) is provided, one end of which is electrically connected to the control unit (152), and the other end of which is adapted to be electrically connected to the electric pressure relief device (120). The control method includes: If the voltage at the output terminal of the mains power detection circuit (151) is zero, then electrical energy is obtained from the energy storage device (158), and the pressure relief drive circuit (154) is turned on to make the electric pressure relief device (120) work.

21. The control method according to claim 17, characterized in that, The circuit structure also includes: The display component (DISP1) and / or buzzer (BZ1) are electrically connected to the control unit (152) and the energy storage device (158). The control method includes: If the voltage at the output terminal of the mains power detection circuit (151) is zero, the display component (DISP1) is controlled to display a reminder message, and / or the buzzer (BZ1) is controlled to sound, wherein the reminder message includes text reminder information.

22. The control method according to claim 17, characterized in that, The mains power detection circuit (151) includes: AC power input terminal; A first voltage divider resistor (151a) is provided, one end of which is electrically connected to the mains input terminal. A second voltage divider resistor (151b) is connected at one end to the other end of the first voltage divider resistor (151a), and the other end of the second voltage divider resistor (151b) is grounded. The resistance of the second voltage divider resistor (151b) is less than the resistance of the first voltage divider resistor (151a). The third diode (D3), one end of which is connected to a direct current source, The control unit (152) is electrically connected between the first voltage divider resistor (151a) and the second voltage divider resistor (151b). The method for determining whether the voltage at the output terminal of the mains power detection circuit (151) is zero is as follows: Based on whether the voltage between the first voltage divider resistor (151a) and the second voltage divider resistor (151b) is zero, determine whether the voltage at the output terminal of the mains power detection circuit (151) is zero. If the voltage between the first voltage divider resistor (151a) and the second voltage divider resistor (151b) is zero, then the voltage at the output terminal of the mains power detection circuit (151) is determined to be zero. If the voltage between the first voltage divider resistor (151a) and the second voltage divider resistor (151b) is not zero, then it is determined that the voltage at the output terminal of the mains power detection circuit (151) is not zero.

23. The control method according to claim 17, characterized in that, The control method includes: If the voltage at the output of the mains power detection circuit (151) is zero, the clock is switched from the first clock to the second clock, where the frequency of the first clock is higher than that of the second clock.

24. The control method according to claim 17, characterized in that, The control method further includes: After determining that the voltage at the output terminal of the mains power detection circuit (151) is zero, the system detects and determines whether the voltage at the output terminal of the mains power detection circuit (151) is zero. If the voltage at the output of the mains power detection circuit (151) is not zero, the clock is switched from the second clock to the first clock, where the frequency of the first clock is higher than that of the second clock.

25. The control method according to claim 19, characterized in that, The control method includes: After controlling the first drive circuit (153a) to turn on and keeping the second drive circuit (153b) off for a first preset time, the first drive circuit (153a) is turned off and the second drive circuit (153b) is turned on.

26. The control method according to claim 19, characterized in that, The control method further includes: After a second preset time has elapsed between controlling the first drive circuit (153a) to disconnect and controlling the second drive circuit (153b) to turn on, the system enters a sleep state.

27. The control method according to claim 26, characterized in that, Since entering sleep mode, it wakes up every third preset time interval to detect and determine whether the voltage at the output terminal of the mains power detection circuit (151) is zero. If the voltage at the output terminal of the mains power detection circuit (151) is zero, it will enter the sleep state again.

28. A cooking utensil, characterized in that, The cooking appliances include The circuit structure according to any one of claims 1 to 16.

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