Cooking utensil and control circuit thereof

Abstract

The utility model discloses a cooking utensil and a control circuit thereof. The cooking utensil control circuit comprises a temperature detection circuit, a heating drive circuit, a first control circuit and a second control circuit. The first control circuit is electrically connected with the temperature detection circuit, and the second control circuit is electrically connected with the temperature detection circuit and the first control circuit. The utility model aims to reduce the complexity of communication and program processing between two control circuits in the cooking utensil.

Description

Technical Field

[0001] The utility model relates to the technical field of internal circuit design of cooking appliances, in particular to a cooking appliance and a control circuit thereof. Background Art

[0002] In cooking appliances, such as IH electric pressure cookers and rice cookers, a first control circuit and a second control circuit are generally provided. However, in actual design, the first control circuit is generally the main control circuit, and the second control circuit needs to communicate back and forth with the first control circuit in the process of executing part of the work. For example, the second control circuit is currently electrically connected to the heating drive circuit and the temperature detection circuit. When the second control circuit needs to control the working state of the heating drive circuit, it is necessary to first upload the result output by the temperature detection circuit to the first control circuit, and then control the working state of the heating drive circuit according to the control instruction issued by the first control circuit. This results in more and more cumbersome communication content between the two control circuits, which increases the complexity and processing time of program processing. Utility Model Content

[0003] The main purpose of the utility model is to provide a cooking appliance control circuit, aiming to reduce the complexity of communication and program processing between two control circuits in the cooking appliance.

[0004] To achieve the above object, the utility model proposes a cooking appliance control circuit, comprising:

[0005] A temperature detection circuit, wherein the temperature detection circuit is used to detect the temperature of the cooking appliance and output a corresponding temperature detection signal;

[0006] A heating drive circuit, wherein the heating drive circuit is used to connect to an external heating device;

[0007] a first control circuit, the first control circuit being electrically connected to the temperature detection circuit; and

[0008] a second control circuit, the second control circuit being electrically connected to the heating drive circuit, and the first control circuit being in unidirectional communication connection with the second control circuit;

[0009] Wherein, the first control circuit is used to output a corresponding heating control signal according to the temperature detection signal so that the second control circuit controls the working state of the heating drive circuit.

[0010] Optionally, the temperature detection circuit includes a steam temperature detection circuit; the steam temperature detection circuit is electrically connected to the first control circuit and is used to detect the steam temperature of the cooking appliance and output a corresponding steam temperature detection signal; wherein the temperature detection signal includes the steam temperature detection signal;

[0011] and / or,

[0012] The cooking utensil includes an inner pot, and the temperature detection circuit includes an inner pot temperature detection circuit; the inner pot temperature detection circuit is electrically connected to the first control circuit, and is used to detect the inner pot temperature of the cooking utensil and output a corresponding inner pot temperature detection signal; wherein the temperature detection signal includes the inner pot temperature detection signal.

[0013] Optionally, the heating control signal includes a heating start control signal and a heating stop control signal;

[0014] The first control circuit is used to output the corresponding heating start control signal or the heating stop control signal to the second control circuit according to the temperature detection signal, so as to keep the temperature of the cooking appliance within a preset temperature range;

[0015] The second control circuit is used to control the heating drive circuit to be in an operating state when receiving the heating start control signal; and is used to control the heating drive circuit to be in a stop working state when receiving the heating stop control signal.

[0016] Optionally, the cooking appliance control circuit includes a plurality of circuit boards; the temperature detection circuit, the heating drive circuit, the first control circuit and the second control circuit are disposed on at least two of the circuit boards.

[0017] Optionally, the plurality of circuit boards include a system control board and a heating control board;

[0018] The first control circuit and the temperature detection circuit are arranged on the system control board; the second control circuit and the heating drive circuit are arranged on the heating control board.

[0019] Optionally, the cooking appliance control circuit further includes:

[0020] A signal processing circuit is electrically connected to the first control circuit and the second control circuit respectively, and is used to process the heating control signal and then output it to the second control circuit.

[0021] Optionally, the signal processing circuit includes:

[0022] a first communication module, the first communication module being electrically connected to the first control circuit;

[0023] a second communication module, the second communication module being electrically connected to the second control circuit;

[0024] The first control circuit is used to output the heating control signal to the second control circuit via the first communication module and the second communication module;

[0025] The first communication module is connected to the second communication module by wired communication, or the first communication module is connected to the second communication module by wireless communication.

[0026] Optionally, the signal processing circuit includes:

[0027] A signal amplifying circuit, wherein the signal amplifying circuit is electrically connected to the first control circuit and the second control circuit respectively, and is used to amplify the heating control signal according to a preset amplification factor and then output it to the second control circuit; wherein the preset amplification factor is greater than or equal to 1.

[0028] Optionally, the signal processing circuit further includes:

[0029] an isolation circuit, wherein an input end of the isolation circuit is electrically connected to the first control circuit, and an output end of the isolation circuit is electrically connected to the second control circuit;

[0030] The isolation circuit is used to isolate the heating control signal output by the first control circuit and output it to the second control circuit.

[0031] Optionally, the cooking appliance control circuit further includes:

[0032] A display driving circuit is electrically connected to the first control circuit; the display driving circuit is used to access a display panel.

[0033] Optionally, the cooking appliance control circuit further includes:

[0034] a power detection circuit, the power detection circuit being electrically connected to the second control circuit and being used to be electrically connected to the external heating device and detect the working power of the external heating device and output a corresponding power detection signal;

[0035] The second control circuit is used to control the operation of the heating drive circuit according to the power detection signal, so that the operating power of the external heating device is within a preset power range.

[0036] Optionally, the power detection circuit includes:

[0037] a voltage detection circuit, the voltage detection circuit being electrically connected to the output end of the heating drive circuit and the second control circuit respectively, and being used to detect the working voltage outputted by the heating drive circuit to the external heating device and output a corresponding voltage detection signal to the second control circuit;

[0038] A current detection circuit is electrically connected to the heating drive circuit and the second control circuit respectively, and is used to detect the working current flowing through the heating drive circuit and output a corresponding current detection signal to the second control circuit.

[0039] Optionally, the cooking appliance control circuit further includes:

[0040] A protection detection circuit, the protection detection circuit is electrically connected to the second control circuit, the protection detection circuit is used to detect the working state of the cooking appliance and output a corresponding protection detection signal, and the second control circuit is also used to control the operation of the heating drive circuit according to the protection detection signal.

[0041] Optionally, the cooking appliance control circuit further includes:

[0042] A trigger module, wherein the trigger module is electrically connected to the first control circuit and is used for outputting a corresponding trigger signal to the first control circuit when being triggered.

[0043] The utility model also provides a cooking appliance, comprising the cooking appliance control circuit as described in any one of the above items.

[0044] Optionally, the cooking utensil includes an IH electric pressure cooker and an IH rice cooker.

[0045] The utility model discloses a cooking utensil and a control circuit thereof, comprising a temperature detection circuit, a heating drive circuit, a first control circuit and a second control circuit. The first control circuit is electrically connected to the temperature detection circuit, and the second control circuit is electrically connected to the temperature detection circuit and the first control circuit respectively. The temperature detection circuit is used to detect the temperature of the cooking utensil and output a corresponding temperature detection signal. The first control circuit is used to output a corresponding heating control signal according to the temperature detection signal so that the second control circuit controls the heating drive circuit to control the working state of an external heating device. In this way, in practical applications, the first control can directly output a signal to the second control circuit according to the result of the temperature detection, so that the first control circuit and the second control circuit only need a one-way communication connection, and the second control circuit controls the heating drive circuit to control the working state of the external heating device accordingly. There is no need for the two control circuits in the prior art to communicate back and forth to realize the cooking utensil to control the working state of the heating drive circuit according to the temperature inside the cooking utensil, thereby effectively reducing the complexity of communication and program processing between the two control circuits in the cooking utensil and improving the speed of program execution. In addition, since the first control circuit sends a signal to the second control circuit in a one-way manner, it is not necessary for both control circuits to have a two-way communication function, which effectively reduces the setting cost of the control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0047] Figure 1 This is a circuit module diagram of an embodiment of a cooking utensil control circuit of the present utility model;

[0048] Figure 2 It is a circuit module schematic diagram of another embodiment of the cooking utensil control circuit of the utility model;

[0049] Figure 3 This is a circuit module diagram of another embodiment of the cooking utensil control circuit of the utility model;

[0050] Figure 4 This is a circuit module diagram of another embodiment of the cooking utensil control circuit of the utility model;

[0051] Figure 5 This is a circuit module diagram of another embodiment of the cooking utensil control circuit of the present invention.

[0052] Description of Figure Numbers:

[0053] Label name Label name 10 First control circuit 20 Second control circuit 30 Temperature detection circuit 40 Heating drive circuit 31 Steam temperature detection circuit 32 Inner pot temperature detection circuit 50 Signal processing circuit 60 Display driver circuit 71 Voltage detection circuit 72 Current detection circuit 80 Protection detection circuit 90 Trigger Module 100 System control board 200 Heating control panel

[0054] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0056] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In cooking appliances, such as IH electric pressure cookers and rice cookers, a first control circuit and a second control circuit are generally provided. However, in actual design, the first control circuit is generally the main control circuit, and the second control circuit needs to communicate back and forth with the first control circuit in the process of executing part of the work. For example, the second control circuit is currently electrically connected to the heating drive circuit and the temperature detection circuit. When the second control circuit needs to control the heating drive circuit to work, it is necessary to first upload the result output by the temperature detection circuit to the first control circuit, and then control the working state of the heating drive circuit according to the control instruction issued by the first control circuit. This results in more and more cumbersome communication content between the two control circuits, which increases the complexity and processing time of program processing.

[0058] To this end, the utility model proposes a cooking appliance control circuit, referring to Figure 1 , in one embodiment of the utility model, comprising:

[0059] The temperature detection circuit 30 is used to detect the temperature of the cooking appliance and output a corresponding temperature detection signal;

[0060] A heating drive circuit 40, the heating drive circuit 40 is used to connect to an external heating device;

[0061] A first control circuit 10, the first control circuit 10 is electrically connected to the temperature detection circuit 30; and

[0062] A second control circuit 20, the second control circuit 20 is electrically connected to the heating drive circuit 40, and the first control circuit 10 is unidirectionally communicated with the second control circuit 20;

[0063] The first control circuit 10 is used to output a corresponding heating control signal according to the temperature detection signal so that the second control circuit 20 controls the working state of the heating driving circuit 40 .

[0064] In this embodiment, the first control circuit 10 and the second control circuit 20 can be implemented by a main controller, such as an MCU, a DSP (Digital Signal Process), a FPGA (Field Programmable Gate Array), or the like.

[0065] The temperature detection circuit 30 can be implemented by a voltage-dividing temperature detection circuit 30 composed of an NTC resistor or a PTC resistor and a fixed resistance resistor. The voltage-dividing voltage signal output by the voltage-dividing temperature detection circuit 30 is the temperature detection signal output by the temperature detection circuit 30. Among them, the NTC resistor or the PTC resistor can be implemented by an NTC probe resistor or a PTC probe resistor, so that it can be fixed in the cooking utensil. Alternatively, the temperature detection circuit 30 can also be implemented by a temperature sensor, such as an infrared temperature sensor, which can detect the temperature of the target to be detected and output the result in the form of a digital signal or an analog signal, that is, output a corresponding temperature detection signal.

[0066] In this embodiment, the external heating device can be implemented by a heating device such as a resistive heating film, a heating coil, etc. Optionally, the heating drive circuit 40 can be implemented by a switching circuit, such as a MOS tube, an IGBT tube, a triode, etc., or by a contact switch, such as a contactor, a relay, etc. Specifically, the second control circuit 20 can control the heating drive circuit 40 to be in an open or closed state to turn on or off the path between the circuits electrically connected to the input and output ends of the heating drive circuit 40. For example, the input end of the heating drive circuit 40 is electrically connected to a power management circuit for outputting an operating voltage, and the output end is electrically connected to the external heating device. The second control circuit 20 can control the heating drive circuit 40 to be in an open (non-working state) or closed state (working state) to control the heating device to be in a stopped working state or in a working state. Optionally, the heating drive circuit 40 can also be implemented by a heating drive chip integrated with the above-mentioned multiple switch devices, and the second control circuit 20 can output a corresponding drive signal to the heating drive chip to make it in a working state or a non-working state. When the heating driving chip is in a working state, it will output an electrical signal of corresponding parameters (such as voltage, frequency, current, etc.) to the connected external heating device according to the received driving signal, so that the external heating device is in a working state; when the heating driving chip is in a non-working state, it will not output any signal to the external heating device, so that it is in a stopped working state.

[0067] Among them, optionally, the first control circuit 10 and the second control circuit 20 can establish a communication connection with each other through a serial communication interface, such as an SPI serial communication interface, a UART serial communication interface, etc. Alternatively, the second control circuit 20 and the first control circuit 10 can also establish an electrical connection path through each other's IO ports, or an IO port that only integrates an ADC function, so that the first control circuit 10 outputs high and low level signals to the ordinary IO interface of the second control circuit 20, or an analog signal of a certain voltage to achieve corresponding control. For example, when the current heating control signal includes a start signal that is a high level signal and a close signal that is a low level signal, then when the first control circuit 10 needs to control the heating drive circuit 40 to be in a stopped working state, it can output a low level signal to the second control circuit 20. In this way, there is no need for the second control circuit 20 and / or the first control circuit 10 to have an interface with serial communication capability, which effectively reduces the cost of the device, thereby reducing the cost of the cooking appliance.

[0068] Optionally, in this embodiment, the heating control signal includes a heating start control signal and a heating shut-off control signal. The first control circuit 10 is used to output a corresponding heating start control signal or a heating shut-off control signal to the second control circuit 20 according to the temperature detection signal, so that the temperature of the cooking appliance is maintained within a preset temperature range; the second control circuit 20 is used to control the heating drive circuit 40 to be in a working state when receiving the heating start control signal; and is used to control the heating drive circuit 40 to be in a stopped working state when receiving the heating shut-off control signal.

[0069] It is understandable that the first control circuit 10 also has a temperature setting signal access terminal for accessing the temperature setting signal, which terminal can be electrically connected to the trigger component in the cooking utensil, such as a touch screen, a button, etc. When the user triggers the trigger component, the trigger component can output the corresponding temperature setting signal. Alternatively, the terminal is electrically connected to a wireless communication module in the cooking utensil that is connected to the external terminal for communication, and the wireless communication module receives the temperature setting signal from the external terminal and outputs it to the first control circuit 10, so that the first control circuit 10 determines the current preset temperature interval, and the preset temperature interval can be a preset degree of floating up and down with the temperature corresponding to the temperature setting signal as the center, for example, if the temperature is set to 95°C, then the preset temperature interval is 95±2°C. When the first control circuit 10 determines that the temperature of the cooking utensil exceeds the upper limit of the preset temperature interval according to the temperature detection signal, it will output a heating shutdown control signal as an analog signal or a digital signal to stop the heating drive circuit 40 from working, so that the external heating device stops the heating operation. On the contrary, when the first control circuit 10 determines that the temperature of the cooking appliance is lower than the lower limit of the preset temperature range according to the temperature detection signal, it will output a heating start control signal as an analog signal or a digital signal to enable the heating drive circuit 40 to start working, so that the external heating device starts the heating operation.

[0070] Optionally, in another embodiment, the heating control signal may also include the above-mentioned temperature setting signal and the current temperature detection signal. The first control circuit 10 may also output the above-mentioned temperature setting signal and the current temperature detection signal directly to the second control circuit 20, so that the second control circuit 20 can automatically execute the same control process performed by the above-mentioned first control circuit 10, which will not be repeated here.

[0071] Thus, in practical applications, the first control circuit 10 can directly output a signal to the second control circuit 20 according to the result of temperature detection, so that the second control circuit 20 can control the heating drive circuit 40 to control the working state of the external heating device accordingly. There is no need for the two control circuits in the prior art to communicate back and forth to realize that the cooking appliance controls the working state of the heating drive circuit 40 according to the temperature inside the cooking appliance, thereby effectively reducing the complexity of communication and program processing between the two control circuits in the cooking appliance and improving the speed of program execution. In addition, since the first control circuit 10 sends a signal to the second control circuit 20 in a unidirectional manner, it is not necessary for both control circuits to have the function of two-way communication, which effectively reduces the setting cost of the control circuit.

[0072] In addition, in an embodiment of the present invention, the cooking appliance control circuit includes a plurality of circuit boards; the temperature detection circuit 30, the heating drive circuit 40, the first control circuit 10 and the second control circuit 20 are disposed on at least two circuit boards.

[0073] In this embodiment, the circuit board can be implemented by glass fiber board, copper substrate, aluminum substrate, ceramic substrate, etc., and the material of the multiple circuit boards can be at least one. Different circuit boards can be electrically connected through connecting parts such as electrical connecting wires, inter-board connectors, and flexible circuit boards to achieve electrical connection between circuits on different circuit boards.

[0074] In one embodiment, reference Figure 3 , a plurality of circuit boards include a system control board 100 and a heating control board 200;

[0075] The first control circuit 10 and the temperature detection circuit 30 are arranged on the system control board 100; the second control circuit 20 and the heating drive circuit 40 are arranged on the heating control board 200. Thus, compared with arranging the above circuits on the same circuit board, the above arrangement does not require a relatively large space to be planned in the cooking appliance for placing a whole circuit board, thereby effectively utilizing the space inside the cooking appliance, and facilitating the structural design and layout of the R&D personnel.

[0076] The utility model discloses a cooking utensil and a control circuit thereof, comprising a temperature detection circuit 30, a heating drive circuit 40, a first control circuit 10 and a second control circuit 20. The first control circuit 10 is electrically connected to the temperature detection circuit 30, and the second control circuit 20 is electrically connected to the temperature detection circuit 30 and the first control circuit 10, respectively. The temperature detection circuit 30 is used to detect the temperature of the cooking utensil and output a corresponding temperature detection signal. The first control circuit 10 is used to output a corresponding heating control signal according to the temperature detection signal so that the second control circuit 20 controls the heating drive circuit 40 to control the working state of the external heating device. In this way, in practical applications, the first control circuit 10 can directly output a signal to the second control circuit 20 according to the result of temperature detection, so that the first control circuit 10 and the second control circuit 20 only need a one-way communication connection, and the second control circuit 20 can control the heating drive circuit 40 to control the working state of the external heating device accordingly. There is no need for the two control circuits in the prior art to communicate back and forth to realize that the cooking utensil controls the working state of the heating drive circuit 40 according to the temperature inside the cooking utensil, thereby effectively reducing the complexity of communication and program processing between the two control circuits in the cooking utensil, and improving the speed of program execution. In addition, since the first control circuit 10 sends signals to the second control circuit 20 in a unidirectional manner, it is not necessary for both control circuits to have a bidirectional communication function, which effectively reduces the installation cost of the control circuit.

[0077] refer to Figure 2In one embodiment of the utility model, the temperature detection circuit 30 includes a steam temperature detection circuit 31; the steam temperature detection circuit 31 is electrically connected to the first control circuit 10, and is used to detect the steam temperature of the cooking appliance and output a corresponding steam temperature detection signal; wherein the temperature detection signal includes a steam temperature detection signal; and / or,

[0078] The cooking utensil includes an inner pot, and the temperature detection circuit 30 includes an inner pot temperature detection circuit 32; the inner pot temperature detection circuit 32 is electrically connected to the first control circuit 10, and is used to detect the inner pot temperature of the cooking utensil and output a corresponding inner pot temperature detection signal; wherein the temperature detection signal includes an inner pot temperature detection signal.

[0079] In this embodiment, the inner pot temperature detection circuit 32 may include the above-mentioned NTC probe resistor so as to be fixed on the inner pot, thereby improving the accuracy of the inner pot temperature detection. Similarly, the steam temperature detection circuit 31 may also include the above-mentioned NTC probe resistor so as to be fixed on the cooking utensil so as to improve the accuracy of the steam temperature detection.

[0080] Specifically, Figure 4 In the example, the temperature detection circuit 30 includes a steam temperature detection circuit 31 and an inner pot temperature detection circuit 32, and the steam temperature detection circuit 31 and the inner pot temperature detection circuit 32 are electrically connected to the first control circuit 1020. The first control circuit 10 will output a corresponding heating control signal to the second control circuit 20 according to the received inner pot temperature detection signal and / or steam temperature detection signal, so that the second control circuit 20 controls the working state of the heating drive circuit 40 accordingly. For example, the first control circuit 10 will determine the inner pot temperature according to the inner pot temperature detection signal and / or determine the steam temperature according to the steam temperature detection signal, and output a corresponding heating control signal to keep the inner pot temperature within a preset inner pot temperature range and keep the steam temperature within a preset steam temperature range.

[0081] refer to Figure 4 In one embodiment of the present utility model, the cooking appliance control circuit further includes:

[0082] The signal processing circuit 50 is electrically connected to the first control circuit 10 and the second control circuit 20 respectively, and is used to process the heating control signal and then output it to the second control circuit 20.

[0083] In this embodiment, in combination with the above embodiments, the signal processing circuit 50 can be arranged on the system control board 100 together with the first control circuit 10, or can be arranged on the heating control board 200 together with the second control circuit 20. Alternatively, the signal processing circuit 50 is arranged on a circuit board alone, and is electrically connected to the system control board 100 and the heating control board 200, respectively.

[0084] Optionally, in one embodiment, the signal processing circuit 50 includes a first communication module and a second communication module, the first communication module is electrically connected to the first control circuit 10, and the second communication module is electrically connected to the second control circuit 20, so that the first control circuit 10 and the second control circuit 20 are connected to each other via a communication network. In this embodiment, optionally, the first communication module and the second communication module can both be wired communication modules, such as a CAN communication module, a LIN communication module, an RS485 communication module, etc., and the first communication module and the second communication module are connected by a corresponding type of communication line. Specifically, taking CAN communication as an example, the heating drive signal output by the first control circuit 10 as a serial signal is converted by the first CAN communication module according to the CAN communication protocol and then output to the second CAN communication module via the CAN communication bus, and the second CAN communication module also converts the received signal into a heating drive signal of a serial signal according to the CAN communication protocol and outputs it to the second control circuit 20. Such a setting can effectively improve the transmission quality of the signal, ensure the accuracy of the signal, and thus improve the reliability and stability of the cooking appliance.

[0085] Optionally, in another embodiment, the first communication module and the second communication module can also be wireless communication modules, such as WIFI communication module, 4G / 5G communication module, Bluetooth communication module, etc. The first communication module and the second communication module establish a communication connection through a corresponding type of wireless communication network to achieve data transmission. Specifically, taking Bluetooth communication as an example, the heating drive signal output by the first control circuit 10 is a serial port signal, which is converted by the first Bluetooth communication module according to the Bluetooth communication protocol and then output through the internal antenna, so that the second Bluetooth communication module receives it through the internal antenna, and also converts the received signal into a serial port signal heating drive signal according to the Bluetooth communication protocol and outputs it to the second control circuit 20. In this way, it is possible to effectively save the space for the wiring harness for signal transmission between the first control circuit 10 and the second control circuit 20 in the cooking appliance, and simplify the structure of the cooking appliance.

[0086] Optionally, in one embodiment, the signal processing circuit includes: an isolation circuit, the input end of the isolation circuit is electrically connected to the first control circuit, and the output end of the isolation circuit is electrically connected to the second control circuit; the isolation circuit is used to isolate the heating control signal output by the first control circuit and output it to the second control circuit. In this embodiment, the isolation circuit can be implemented by a transformer, an optocoupler isolation circuit, etc. The heating control signal output by the first control circuit can be output to the second control circuit via the isolation circuit, thereby realizing electromagnetic isolation between the first control circuit and the second control circuit, and ensuring the reliability and stability of signal transmission.

[0087] Optionally, in another embodiment, the signal processing circuit 50 includes: a signal amplification circuit, which is electrically connected to the first control circuit 10 and the second control circuit 20, respectively, and is used to amplify the heating control signal according to a preset amplification factor and output it to the second control circuit 20; wherein the preset amplification factor is greater than or equal to 1.

[0088] In this embodiment, optionally, the signal amplification circuit can be formed by a plurality of switch devices, a plurality of resistors, and a plurality of capacitors. Alternatively, optionally, the signal amplification circuit can also be directly implemented by using a signal amplification chip, such as a differential amplifier. Among them, the amplification factor of the signal amplification circuit can be set in advance by the R&D personnel, or controlled by the first control circuit 10, so that the first control circuit 10 adjusts the preset amplification factor of the signal amplification circuit according to the current signal to be transmitted. For example, if the heating control signal is currently transmitted, then the current amplification factor will be determined to be 10 times according to the preset signal-amplification factor mapping table, and the preset amplification factor of the signal amplification circuit will be controlled to be 10 times. In this way, through the above-mentioned setting, in the cooking utensil, the heating control signal and other signals transmitted by the first control circuit 10 to the second control signal can be amplified by the signal amplification circuit and output to the second control circuit 20, thereby ensuring the accuracy and reliability of the signal during the transmission process.

[0089] In addition, it is understandable that the signal processing circuit 50 can also be a control circuit to directly output the signal output by the first control circuit 10 to the second control circuit 20 .

[0090] refer to Figure 5 In one embodiment of the present utility model, the cooking appliance control circuit further includes:

[0091] The display driving circuit 60 is electrically connected to the first control circuit 10 ; the display driving circuit 60 is used to access the display panel.

[0092] In this embodiment, the display panel can be implemented by a display panel such as an LED screen, an LCD screen, an OLED screen, a MINILED screen, a TFT screen, etc., and the display driving circuit 60 can be implemented by a display driving chip matching the display panel, or by a switch driving circuit composed of multiple switch tubes. The first control circuit 10 can control the display driving circuit 60 to drive the display panel to display different images according to the received external signal. For example, the external signal here is the temperature detection signal output by the current temperature detection circuit 30, and the first control circuit 10 can control the display driving circuit 60 to drive the display panel to display the current temperature in the cooking utensil according to the temperature detection signal. Such a setting effectively improves the convenience of users using cooking utensils.

[0093] In one embodiment of the present utility model, the cooking appliance control circuit further includes:

[0094] A power detection circuit, the power detection circuit is electrically connected to the second control circuit 20, and is used to be electrically connected to the external heating device and detect the working power of the external heating device and output a corresponding power detection signal;

[0095] The second control circuit 20 is used to control the operation of the heating drive circuit 40 according to the power detection signal, so that the operating power of the external heating device is within a preset power range.

[0096] In this embodiment, optionally, the power detection circuit can be directly implemented using a power detection module or a power detection chip. The power detection chip can be arranged in series in the path between the external heating device and the heating drive circuit 40, and detect the current flowing through the external heating device and the voltage on the external heating device, and then calculate the current working power of the external heating device and output the corresponding power detection signal to the second control circuit 20.

[0097] Optionally, refer to Figure 5 The power detection circuit includes: a voltage detection circuit 71, which is electrically connected to the output end of the heating drive circuit 40 and the second control circuit 20 respectively, and is used to detect the working voltage output by the heating drive circuit 40 to the external heating device and output a corresponding voltage detection signal to the second control circuit 20;

[0098] The current detection circuit 72 is electrically connected to the heating drive circuit 40 and the second control circuit 20 respectively, and is used to detect the working current flowing through the heating drive circuit 40 and output a corresponding current detection signal to the second control circuit 20.

[0099] In this embodiment, the voltage detection circuit 71 can be implemented by a resistor voltage divider circuit, or by a voltage detection chip or a voltage sampling chip. The second control circuit 20 can determine the operating voltage output by the heating drive circuit 40 to the external heating device according to the voltage detection signal output by the voltage detection circuit 71. The current detection circuit 72 can be implemented by a shunt composed of current sensing resistors, a Hall current sensor, etc. The second control circuit 20 can determine the operating current flowing through the external heating device in the cooking utensil according to the current detection signal output by the current detection circuit 72. In this way, the calculation unit in the second control circuit 20 can determine the operating power of the external heating device according to the currently determined operating voltage and operating current of the external heating device.

[0100] Optionally, in combination with the above embodiments, the user can set the required heating power or the heating gear of the cooking appliance by triggering the trigger component electrically connected to the first control circuit 10, or by an external terminal communicatively connected to the cooking appliance. After receiving the power setting signal via the trigger component or the external terminal, the first control circuit 10 will transmit the preset power range corresponding to the current power setting signal to the second control circuit 20 as the preset power range of the second control circuit 20. Optionally, the above trigger component can also be electrically connected to the second control circuit 20, and / or the external terminal can be communicatively connected to the second control circuit 20. The user can use the same method as above to make the second control circuit 20 confirm the current preset power range.

[0101] Specifically, when the second control circuit 20 receives and determines that it is necessary to start controlling the heating drive circuit 40 to start the heating operation of the external heating device according to the heating control signal sent by the first control circuit 10, the heating drive circuit 40 will be adjusted and controlled in real time according to the working power of the external heating device obtained in the above-mentioned embodiment process, so that the working power of the external heating device is within the preset power range. For example, the heating drive circuit 40 is a switching circuit, and the second control circuit 20 can adjust the duty cycle of the PWM signal output to the switching circuit to adjust the current working voltage and working current output to the external heating device, thereby adjusting the working power of the external heating device and keeping the working power of the external heating device within the preset power range.

[0102] In addition, reference Figure 5 In one embodiment of the present utility model, the cooking appliance control circuit further includes:

[0103] The protection detection circuit 80 is electrically connected to the second control circuit 20. The protection detection circuit 80 is used to detect the working state of the cooking appliance and output a corresponding protection detection signal. The second control circuit 20 is also used to control the working state of the heating drive circuit 40 according to the protection detection signal.

[0104] In this embodiment, the protection detection circuit 80 may include a voltage surge detection circuit, a current peak detection circuit and other circuits, and a temperature detection circuit 30. Specifically, the protection detection circuit 80 can detect the surge value of the power supply voltage currently input to the cooking appliance and / or the peak value of the total working current, and when it is confirmed that the surge of the power supply voltage reaches a preset surge voltage value or the peak current reaches a preset peak current value (both can be preset by the R&D personnel in the second control circuit 20), the heating drive circuit 40 is controlled to perform a protection action, such as controlling the heating drive circuit 40 to be in an open state, thereby protecting the cooking appliance. In this way, in actual application, the utility model can not only improve the speed of internal software execution through one-way communication and reduce the signal delay caused by interaction, but also be provided with a protection detection circuit that can simultaneously improve the stability and reliability of the operation of the first control circuit and the second control circuit, thereby improving the reliability and stability of the operation of the cooking appliance.

[0105] refer to Figure 5 In one embodiment of the present utility model, the cooking appliance control circuit further includes:

[0106] The trigger module 90 is electrically connected to the first control circuit 10 and is used to output a corresponding trigger signal to the first control circuit 10 when being triggered.

[0107] In this embodiment, optionally, the trigger module 90 can be implemented by a physical trigger device, such as a toggle switch, a button array, a knob, etc. Optionally, the trigger module 90 can also be implemented by a virtual trigger module 90, for example, a touch area is provided on the surface of the cooking utensil and a touch detection chip electrically connected to the touch area is provided therein, or a touch chip and a touch panel are implemented, and the touch panel and the display panel are overlapped to form a touch screen. In this way, the user can trigger the touch module so that the touch module outputs a corresponding trigger signal to the first control circuit 10, for example, the trigger signal may include a power gear setting signal, a temperature setting signal, a heating on / off signal, a heating mode setting signal, etc., so that the user can set the working state of the cooking utensil, effectively improving the convenience of the cooking utensil used by the user.

[0108] The utility model also provides a cooking appliance, comprising any one of the above cooking appliance control circuits.

[0109] In this embodiment, the cooking appliance includes an IH electric pressure cooker and an IH rice cooker.

[0110] It is worth noting that, since the cooking appliance of the present invention includes all technical solutions of all embodiments of the above-mentioned cooking appliance control circuit, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned cooking appliance control circuit, which will not be described one by one here.

[0111] The above contents are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cooking appliance control circuit, characterized in that: include: A temperature detection circuit, wherein the temperature detection circuit is used to detect the temperature of the cooking appliance and output a corresponding temperature detection signal; A heating drive circuit, wherein the heating drive circuit is used to connect to an external heating device; a first control circuit, the first control circuit being electrically connected to the temperature detection circuit; as well as, a second control circuit, the second control circuit being electrically connected to the heating drive circuit, and the first control circuit being in unidirectional communication connection with the second control circuit; Wherein, the first control circuit is used to output a corresponding heating control signal according to the temperature detection signal so that the second control circuit controls the working state of the heating drive circuit.

2. The cooking appliance control circuit according to claim 1, characterized in that: The temperature detection circuit includes a steam temperature detection circuit; the steam temperature detection circuit is electrically connected to the first control circuit and is used to detect the steam temperature of the cooking appliance and output a corresponding steam temperature detection signal; wherein the temperature detection signal includes the steam temperature detection signal; and / or, The cooking utensil includes an inner pot, and the temperature detection circuit includes an inner pot temperature detection circuit; the inner pot temperature detection circuit is electrically connected to the first control circuit, and is used to detect the inner pot temperature of the cooking utensil and output a corresponding inner pot temperature detection signal; wherein the temperature detection signal includes the inner pot temperature detection signal.

3. The cooking appliance control circuit according to claim 1, characterized in that: The heating control signal includes a heating start control signal and a heating stop control signal; The first control circuit is used to output the corresponding heating start control signal or the heating stop control signal to the second control circuit according to the temperature detection signal, so as to keep the temperature of the cooking appliance within a preset temperature range; The second control circuit is used to control the heating drive circuit to be in an operating state when receiving the heating start control signal; and is used to control the heating drive circuit to be in a stop working state when receiving the heating stop control signal.

4. The cooking appliance control circuit according to any one of claims 1 to 3, characterized in that: The cooking appliance control circuit includes a plurality of circuit boards; the temperature detection circuit, the heating drive circuit, the first control circuit and the second control circuit are disposed on at least two of the circuit boards.

5. The cooking appliance control circuit according to claim 4, characterized in that: The plurality of circuit boards include a system control board and a heating control board; The first control circuit and the temperature detection circuit are arranged on the system control board; the second control circuit and the heating drive circuit are arranged on the heating control board.

6. The cooking appliance control circuit according to any one of claims 1 to 3, characterized in that: The cooking appliance control circuit further comprises: A signal processing circuit is electrically connected to the first control circuit and the second control circuit respectively, and is used to process the heating control signal and then output it to the second control circuit.

7. The cooking appliance control circuit according to claim 6, characterized in that: The signal processing circuit comprises: a first communication module, the first communication module being electrically connected to the first control circuit; a second communication module, the second communication module being electrically connected to the second control circuit; The first control circuit is used to output the heating control signal to the second control circuit via the first communication module and the second communication module; The first communication module is connected to the second communication module by wired communication, or the first communication module is connected to the second communication module by wireless communication.

8. The cooking appliance control circuit according to claim 6, characterized in that: The signal processing circuit comprises: A signal amplifying circuit, wherein the signal amplifying circuit is electrically connected to the first control circuit and the second control circuit respectively, and is used to amplify the heating control signal according to a preset amplification factor and then output it to the second control circuit; wherein the preset amplification factor is greater than or equal to 1.

9. The cooking appliance control circuit according to claim 6, characterized in that: The signal processing circuit comprises: an isolation circuit, wherein an input end of the isolation circuit is electrically connected to the first control circuit, and an output end of the isolation circuit is electrically connected to the second control circuit; The isolation circuit is used to isolate the heating control signal output by the first control circuit and output it to the second control circuit.

10. The cooking appliance control circuit according to any one of claims 1 to 3, characterized in that: The cooking appliance control circuit further comprises: A display driving circuit is electrically connected to the first control circuit; the display driving circuit is used to access a display panel.

11. The cooking appliance control circuit according to any one of claims 1 to 3, characterized in that: The cooking appliance control circuit further comprises: a power detection circuit, the power detection circuit being electrically connected to the second control circuit and being used to be electrically connected to the external heating device and detect the working power of the external heating device and output a corresponding power detection signal; The second control circuit is used to control the operation of the heating drive circuit according to the power detection signal, so that the operating power of the external heating device is within a preset power range.

12. The cooking appliance control circuit according to claim 11, characterized in that: The power detection circuit comprises: a voltage detection circuit, the voltage detection circuit being electrically connected to the output end of the heating drive circuit and the second control circuit respectively, and being used to detect the working voltage outputted by the heating drive circuit to the external heating device and output a corresponding voltage detection signal to the second control circuit; A current detection circuit is electrically connected to the heating drive circuit and the second control circuit respectively, and is used to detect the working current flowing through the heating drive circuit and output a corresponding current detection signal to the second control circuit.

13. The cooking appliance control circuit according to any one of claims 1 to 3, characterized in that: The cooking appliance control circuit also includes: A protection detection circuit, the protection detection circuit is electrically connected to the second control circuit, the protection detection circuit is used to detect the working state of the cooking appliance and output a corresponding protection detection signal, and the second control circuit is also used to control the working state of the heating drive circuit according to the protection detection signal.

14. The cooking appliance control circuit according to any one of claims 1 to 3, characterized in that: The cooking appliance control circuit also includes: A trigger module, wherein the trigger module is electrically connected to the first control circuit and is used for outputting a corresponding trigger signal to the first control circuit when being triggered.

15. A cooking utensil, characterized in that: The cooking appliance control circuit comprises the cooking appliance control circuit as described in any one of claims 1 to 14.

16. The cooking appliance according to claim 15, characterized in that The cooking utensils include an IH electric pressure cooker and an IH rice cooker.

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