Stove control system and stove
By using a parallel connection of a first resistor and a second resistor in the stove temperature sensor, combined with an NTC sensor and capacitor filtering, the problems of low temperature detection accuracy and high standby power consumption in existing stoves are solved, achieving high-precision and low-cost temperature detection.
Patent Information
- Application Number
- CN202520551933.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-26
AI Technical Summary
The temperature sensors in existing cooktops have low resistance at high temperatures and high resistance at low temperatures, resulting in low accuracy and requiring high-precision conversion circuits, which increases costs.
By using a parallel connection of the first and second resistors, voltage is divided at low temperatures and connected in parallel at high temperatures. Combined with an NTC sensor, temperature information is detected by the controller, and interference is filtered out by a capacitor to reduce standby power consumption.
It improves the accuracy and cost-effectiveness of temperature detection, reduces the voltage sampling resolution requirements of the controller, and reduces standby power consumption.
Smart Images
Figure CN223796852U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of kitchen appliances technology, and more specifically, to a control system for a stove and a stove. Background Technology
[0002] Currently, various types of stoves are widely used for cooking. With technological advancements and improved living standards, ordinary stoves are no longer sufficient to meet the demands of high-quality cooking. Therefore, stoves with temperature detection functions have become widely popular among consumers.
[0003] In existing technologies, some cooktops directly detect the temperature of the cookware to prevent it from overheating and drying out. For example, some cooktops have a temperature sensor attached to the bottom of the cookware and compare the temperature with a preset value to determine if dry burning has occurred, stopping heating if dry burning occurs. Other cooktops use infrared sensors to detect the temperature of the cookware in a non-contact manner.
[0004] Some cooktops use negative temperature coefficient (NTC) temperature sensors to detect temperature. These sensors are highly accurate, small in size, and relatively inexpensive. However, these sensors exhibit low resistance at high temperatures and high resistance at low temperatures, necessitating more precise conversion circuitry for accurate temperature readings. Utility Model Content
[0005] To at least partially address the problems existing in the prior art, some embodiments of this application provide a control system for a stove, including: a temperature detection circuit and a controller. The temperature detection circuit includes a temperature sensor, a first resistor and a second resistor for voltage division with the temperature sensor. The first resistor and the temperature sensor are connected in series between a power supply and ground. The first end of the first resistor and the first end of the temperature sensor are both connected to the first end of the second resistor. The resistance value of the first resistor is greater than the resistance value of the second resistor. The controller is provided with a first signal acquisition pin and a first control pin. The first signal acquisition pin is connected to the first end of the temperature sensor to acquire the temperature detected by the temperature sensor. The first control pin is connected to the second end of the second resistor to control the second resistor. When the temperature detected by the temperature detection circuit is higher than a temperature threshold, the second resistor and the first resistor are connected in parallel. When the temperature is lower than or equal to the temperature threshold, the second resistor is in an open-circuit state. In summary, by detecting the temperature information obtained via an NTC through the controller, and using a resistor with a larger resistance value to divide the voltage with the NTC at low temperatures, a larger temperature range can be obtained. When the temperature reaches a high temperature, connecting a smaller resistor in parallel with a larger resistor via the controller pin can significantly improve the accuracy of temperature detection and reduce the resolution requirements for the controller voltage sampling. Cooktops using this circuit scheme offer better cost performance.
[0006] For example, the second terminal of the temperature sensor is connected to a power supply, the second terminal of the first resistor is grounded, and the second terminal of the second resistor is grounded via a capacitor. This allows the first and second resistors to be connected in parallel at high temperatures without introducing additional resistance. The second terminal of the second resistor is grounded via a capacitor, which filters out external electromagnetic interference. Furthermore, the capacitor only allows alternating current to pass through, thus not affecting the accuracy of the detected temperature.
[0007] For example, the control system also includes a first transistor, the second terminal of the first resistor is grounded via the first transistor, and the controller is further provided with a second control pin connected to the control terminal of the first transistor. In the standby state when the stove is off, since temperature detection is not required, the first transistor can be turned off by stopping the output of electrical signals to the control terminal of the first transistor, and the current will not pass through the NTC and the first resistor, thereby reducing the standby power consumption of the stove.
[0008] For example, the control system also includes a diode connected in parallel with the temperature sensor. By providing the diode in parallel with the NTC, these pulse voltages can be absorbed.
[0009] For example, the control system further includes a flame detection circuit, and the controller is also provided with a second signal acquisition pin. The flame detection circuit includes a thermocouple and an amplifier module. The input terminal of the amplifier module is connected to the thermocouple, and the output terminal of the amplifier module is connected to the second signal acquisition pin. Thus, the controller can use the thermocouple holding the solenoid valve to determine whether the flame has been extinguished, and can issue an alarm or enter a standby state when the flame is extinguished.
[0010] For example, the control system also includes a first transistor, the ground terminal of the amplifier module is grounded via the first transistor, and the controller is further provided with a second control pin connected to the control terminal of the first transistor. This prevents these components from generating current, thereby reducing the power consumption of the stove. The first transistor also serves to isolate the analog ground of the analog circuit from the digital ground of the digital circuit.
[0011] For example, a second transistor is included, with the power supply terminal of the amplifier module connected to the power source via the second transistor, and the control terminal of the second transistor grounded via the first transistor. When the stove is in standby mode, the first transistor is turned off, the control terminal of the second transistor is no longer grounded, and the second transistor can also be turned off, completely preventing the power supply from forming a loop through any component in the amplifier module, further reducing standby current. This design eliminates the need for an additional controller pin.
[0012] For example, the control system also includes a series circuit, which comprises a voltage divider resistor, multiple coded resistors, and a DIP switch connected in sequence. The DIP switch includes multiple switching elements. The second terminal of each voltage divider resistor is connected to the first terminal of all the coded resistors. The second terminal of each coded resistor is connected one-to-one with the first terminal of each switching element. The series circuit is connected between the power supply and ground. The controller also has a third signal acquisition pin connected to the second terminal of the voltage divider resistor. When the multiple switching elements of the DIP switch are in different combinations, the total resistance value of the voltage divider circuit formed by the voltage divider resistor and the coded resistors is different, and the voltage at the voltage divider point formed by the voltage divider resistor and the coded resistor is different. By detecting the voltage at the voltage divider point, the information the user wants to input into the control system, such as temperature control or cookware type, can be determined. Encoding via a series circuit simplifies operation, saves controller pin resources, and reduces costs.
[0013] For example, the control system further includes a third transistor, through which the first end of the voltage divider resistor is connected to the power supply. The controller also includes a third control pin connected to the control terminal of the third transistor. When the control system is programmed, the third control pin outputs a signal, turning on the third transistor and connecting the voltage divider resistor to the power supply. In this case, the control system can detect the voltage at the voltage divider point of the voltage divider resistor and the encoding resistor to determine the current on / off state of the DIP switch. When the control system is not programmed, the third control pin does not output a signal, the voltage divider resistor and the encoding resistor do not form a loop, and no power is consumed.
[0014] This application also provides a cooktop, including the aforementioned control system.
[0015] This utility model description introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0016] The advantages and features of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0017] The following drawings, which are incorporated herein by reference and are used to understand this application, illustrate embodiments of the invention and their descriptions to explain the principles of the invention. In the drawings,
[0018] Figure 1 This is a circuit diagram of a temperature detection circuit of a control system according to an exemplary embodiment of this application;
[0019] Figure 2 According to Figure 1A circuit diagram of another part of the control system in the illustrated embodiment;
[0020] Figure 3 According to Figure 1 A circuit diagram of the flame detection circuit of the control system in the embodiment shown.
[0021] Figure 4 According to Figure 1 A circuit diagram of the series circuit portion of the control system in the illustrated embodiment.
[0022] Figure 5 According to Figure 1 The circuit diagram of the maintenance / closing valve circuit of the control system in the embodiment shown.
[0023] Figure 6 According to Figure 1 The circuit diagram of the system power supply circuit of the control system in the embodiment shown. Detailed Implementation
[0024] In the following description, numerous details are provided to enable a thorough understanding of this application. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the application, and that the application can be implemented without one or more of these details. Furthermore, to avoid confusion with this application, some technical features well-known in the art have not been described in detail.
[0025] 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. Preferred embodiments of this application are described in detail below; however, other embodiments may be available in addition to these detailed descriptions.
[0026] This application provides a control system for a stove, such as... Figure 1As shown, the system includes a temperature detection circuit and a controller. The temperature detection circuit includes a temperature sensor, a first resistor R51 for voltage division with the temperature sensor, and a second resistor R43. The first resistor R51 and the temperature sensor are connected in series between the power supply and ground. The first terminals of both the first resistor R51 and the temperature sensor are connected to the first terminal of the second resistor R43. The resistance of the first resistor R51 is greater than the resistance of the second resistor R43. The controller has a first signal acquisition pin ZGSTT-AD and a first control pin ZGS-GND. The first signal acquisition pin ZGSTT-AD is connected to the first terminal of the temperature sensor to acquire the temperature detected by the sensor. The first control pin ZGS-GND is connected to the second terminal of the second resistor R43 to control the second resistor R43. The controller may include a microcontroller, embedded system, field-programmable gate array (FPGA), or other control modules or chips, as well as peripheral components. The first signal acquisition pin ZGSTT-AD can be an analog signal input pin for the controller. When the temperature detected by the temperature detection circuit is higher than the temperature threshold, the second resistor R43 and the first resistor R51 are connected in parallel. When the temperature is lower than or equal to the temperature threshold, the second resistor R43 is in an open circuit state.
[0027] For clarity and brevity, the negative temperature coefficient temperature sensor of this application will be referred to as NTC below. In one exemplary embodiment, when the stove starts working, the NTC is in a low-temperature state by default. At this time, the NTC and the first resistor R51 are connected in series to divide the voltage. Optionally, the NTC and the first resistor R51 can divide the voltage of the stove's main power supply. Figure 1In the illustrated embodiment, the main power supply is 3.6V, the voltage divided by the NTC is Vn, and the voltage divided by the first resistor R51 is 3.6 - Vn, where Vn is a positive number. In embodiments not shown, the power supply connected to the NTC and the first resistor R51 can be obtained by converting the main power supply, or it can be provided by a power supply other than the main power supply. Specifically, for example, the main power supply can output a regulated 3.3V power supply through a voltage regulator IC, and the 3.3V regulated power supply can be divided by the first resistor R51 and the NTC. Besides the above examples, the voltage output by the regulated power supply can be arbitrarily selected according to the actual circuit design. In this embodiment, the first resistor R51 has a large resistance value, for example, a 100K ohm resistor. The resistance value of the NTC at low temperatures is around 100K ohms, and after voltage division, the voltage value at the voltage divider point (the first terminal of the first resistor R51) is approximately half of the power supply voltage. The first control pin, ZGS-GND, can be an input / output pin (IO pin) of the controller. When the controller determines that the stove is in a low-temperature state based on the currently detected temperature, it controls this pin to be in a high-impedance state, which is equivalent to making the end of the second resistor R43 connected to this pin floating, neither connected to any power supply nor grounded. If the controller determines that the stove is in a high-temperature state based on the currently detected temperature value, it can ground the first control pin, ZGS-GND. Figure 1 In the illustrated embodiment, the first terminal of the first resistor R51 is connected to the first terminal of the second resistor R43, the second terminal of the first resistor R51 is grounded, and the second terminal of the second resistor R43 is grounded via the controller. Thus, the first resistor R51 and the second resistor R43 are connected in parallel. The resistance value of the first resistor R51 is relatively small, approximately 10K ohms, and the resistance value after parallel connection with the second resistor R43 is approximately 9.99K ohms, close to the resistance value of an NTC resistor at high temperatures. This ensures that the voltage at the voltage divider point remains approximately half of the power supply voltage.
[0028] For a typical NTC, the relationship between temperature and resistance is as follows:
[0029] RT = RN expB(1 / T – 1 / TN), where,
[0030] RT: The NTC resistance value at temperature T (Kelvin, K).
[0031] RN: NTC resistance value at the rated temperature TN(K).
[0032] T: Specified temperature (K).
[0033] B: The material constant of NTC thermistors, also known as the thermistor index.
[0034] exp: The exponent with base e (e = 2.71828...)
[0035] Therefore, it can be seen that the resistance of NTC changes exponentially with temperature. Figure 1 Taking the example of a power supply voltage of 3.6V and a temperature sensor resistance varying between 100K ohms and 10K ohms, the controller detects a voltage of approximately 1.8V at low temperatures. As the temperature rises or falls, the resistance changes by approximately 10K ohms (before reaching a high temperature). Therefore, the controller detects a voltage change on the order of 0.1V. At high temperatures, the temperature sensor's resistance changes by approximately 1K ohms as the temperature rises or falls. If the first resistor R51 is still used to divide the voltage with the temperature sensor, the controller detects a voltage change on the order of 0.01V. For example, at 25 degrees Celsius, the NTC's resistance is 100K ohms; at 30 degrees Celsius, the NTC's resistance is approximately 80K ohms, and the controller detects a voltage change from 1.8V to 2V. At 100 degrees Celsius, the resistance of the NTC is approximately 7K ohms, and at 105 degrees Celsius, it is approximately 6K ohms. Using the first resistor R51 and the temperature sensor as a voltage divider, the voltage detected by the controller changes from 3.364V to 3.396V. If, at high temperatures, the first resistor R51 and the second resistor R43 are connected in parallel, the voltage detected by the controller changes from approximately 2.117V to approximately 2.249V. This ensures accurate temperature detection even with a relatively low resolution analog-to-digital converter (ADC) in the controller, improving temperature detection accuracy without changing the controller cost.
[0036] exist Figure 1 In the illustrated embodiment, the second terminal of the NTC is connected to the positive terminal of the power supply. The first terminals of the first resistor R51 and the second resistor R43 are both connected to the first terminal of the NTC. The second terminal of the first resistor R51 is grounded, and the second terminal of the second resistor R43 is either left floating or grounded via the controller. In an embodiment not shown, the second terminal of the NTC can also be grounded, the second terminal of the first resistor R51 can be connected to the positive terminal of the power supply, and the second terminal of the second resistor R43 can be left floating or connected to the positive terminal of the power supply via the controller. In short, any circuit connection method can be used as long as the resistance value signal of the NTC can be converted into a voltage signal that is easily detected by the controller.
[0037] In summary, by detecting temperature information obtained via the NTC through the controller, a wider temperature range can be obtained by using a larger resistor to divide the voltage with the NTC when the temperature is low. When the temperature reaches a high temperature, connecting a smaller resistor in parallel with a larger resistor through the controller pins significantly improves the temperature detection accuracy and reduces the resolution requirements of the controller voltage sampling. This greatly reduces costs, making cooktops using this circuit design more cost-effective.
[0038] For example, the second terminal of the temperature sensor is connected to the power supply, and the second terminal of the first resistor R51 is grounded. Taking a controller using a microcontroller as an example, some microcontroller pins have stronger pull-down capabilities than pull-up capabilities, or they output in an open-drain configuration. In other words, these pins cannot output power supply voltage, or the power supply voltage output by these pins is generated by a pull-up resistor, but the pins can be grounded through internal circuitry. Therefore, it is convenient to connect the first resistor R51 and the second resistor R43 in parallel at high temperatures without introducing additional resistance. The second terminal of the second resistor R43 is grounded through a capacitor, which can filter out external electromagnetic interference. Furthermore, the capacitor only allows AC current to pass through, thus not affecting the accuracy of the detected temperature.
[0039] refer to Figure 2 For example, the control system may further include a first transistor Q16, with the second terminal of the first resistor R51 grounded to GND via the first transistor Q16. The controller also has a second control pin XLKZ, which is connected to the control terminal of the first transistor Q16. The first transistor Q16 can be a transistor, field-effect transistor, etc. When a suitable electrical signal is input to its control terminal, the first transistor Q16 conducts, grounding the second terminal of the first resistor R51. In the standby state when the stove is off, since temperature detection is not required, the first transistor Q16 can be turned off by stopping the output of electrical signals to its control terminal. This prevents current from flowing through the NTC and the first resistor R51, reducing the stove's standby power consumption.
[0040] For example, the control system also includes a diode Z1 connected in parallel with the temperature sensor. The control system's circuit board is typically located inside the cooktop, and the NTC needs to be positioned at the temperature detection point. The circuit board and NTC are usually directly connected by wires, and for gas cooktops, the NTC is inevitably close to the ignition needle. For induction cookers, the NTC is also close to the induction coil. In short, the wires connecting the NTC are susceptible to electromagnetic pulses during ignition or electromagnetic waves from the induction cooker coil. These electromagnetic waves can generate pulse voltages in the circuit, potentially causing the controller to malfunction, freeze, or even become damaged. By using diode Z1 connected in parallel with the NTC, these pulse voltages can be absorbed. Optionally, diode Z1 can be a Zener diode, a transient voltage suppressor (TVS) diode, or a common diode reverse-connected in the circuit.
[0041] like Figure 3As shown, exemplarily, the control system also includes a flame detection circuit, and the controller is further provided with a second signal acquisition pin ZRD01. The flame detection circuit includes a thermocouple and an amplifier module. The input terminal of the amplifier module is connected to the thermocouple, and the output terminal of the amplifier module is connected to the second signal acquisition pin ZRD01. For stoves, to prevent gas leakage due to accidental flameout, a thermocouple and a solenoid valve are typically installed. The flame of the stove heats the thermocouple, generating a current to maintain the opening of the solenoid valve. When the flame goes out, the solenoid valve closes, stopping the gas output. Thermocouples can typically generate tens of millivolts of voltage, which, after being amplified by the amplifier module, reaches a voltage that the controller can detect. The amplifier module may include operational amplifier integrated circuits and resistors, or may be constructed from discrete transistors. Therefore, the controller can use the thermocouple maintaining the solenoid valve to determine whether the flame is extinguished, and can issue an alarm or enter standby mode when the flame is extinguished.
[0042] Reference Figures 1-3 For example, the control system further includes a first transistor Q16, the ground terminal of the amplifier module is grounded through the first transistor Q16, and the controller is also provided with a second control pin XLKZ, which is connected to the control terminal of the first transistor Q16. In the embodiment shown, when the first transistor Q16 is turned off, it can simultaneously disconnect the grounding of the first resistor R51 and the grounding of the amplifier module. This prevents these components from generating current, thereby reducing the power consumption of the stove. The first transistor Q16 can also isolate the analog ground of the analog circuit from the digital ground of the digital circuit.
[0043] For example, the control system may further include a second transistor Q7, with the power supply terminal of the amplifier module connected to the power source via the second transistor Q7, and the control terminal of the second transistor Q7 grounded via the first transistor Q16. When the first transistor Q16 is grounded, the second transistor Q7 can conduct, thereby connecting the power supply terminal of the amplifier module to the power source. When the stove is in standby mode, the first transistor Q16 is turned off, the control terminal of the second transistor Q7 is no longer grounded, and the second transistor Q7 can also be turned off, completely preventing the power supply from forming a loop through any component in the amplifier module, further reducing the standby current. This design eliminates the need for additional controller pins.
[0044] For example, refer to Figure 4The control system may also include a series circuit, which comprises a voltage divider resistor R82, multiple encoding resistors R77-R80, and a DIP switch SW1 connected in sequence. The DIP switch SW1 includes multiple switching elements. The second terminal of the voltage divider resistor R82 is connected to the first terminal of all the encoding resistors R77-R80. The second terminal of each encoding resistor R77-R80 is connected one-to-one with the first terminal of each switching element. The series circuit is connected between the power supply and ground. The controller also has a third signal acquisition pin KEY-AD, which is connected to the second terminal of the voltage divider resistor R82. When the multiple switching elements of the DIP switch SW1 are in different combinations, the total resistance value of the voltage divider circuit formed by the voltage divider resistor R82 and the encoding resistors R77-R80 is different, and the voltage at the voltage divider point formed by the voltage divider resistor R82 and the encoding resistors R77-R80 is different. By detecting the voltage at the voltage divider point, the information the user wants to input into the control system, such as temperature control or cookware type, can be determined. Encoding via a series circuit simplifies operation, saves controller pin resources, and reduces costs.
[0045] For example, the control system may further include a third transistor Q1, with the first terminal of the voltage divider resistor R82 connected to the power supply via the third transistor Q1. The controller also includes a third control pin connected to the control terminal of the third transistor Q1. When the control system is programmed, the third control pin outputs a signal, turning on the third transistor Q1 and connecting the voltage divider resistor R82 to the power supply. In this case, the control system can detect the voltage at the voltage divider point of the voltage divider resistor R82 and the encoding resistors R77-R80 to determine the current on / off state of the DIP switch SW1. When the control system is not programmed, the third control pin does not output a signal, and the voltage divider resistor R82 and the encoding resistors R77-R80 do not form a circuit, thus consuming no power.
[0046] In some embodiments, the control system may further include a potentiometer detection circuit. The potentiometer in the potentiometer detection circuit can be disposed on the valve body knob to detect the user's operation of the valve body knob and the position of the valve body knob. The center pin (vernier) of the potentiometer is connected to one of the left and right pins, forming one connection terminal of the potentiometer; the other of the left and right pins forms the other connection terminal. One of the two connection terminals of the potentiometer is connected to a power supply, and the other is grounded through a resistor and connected to the controller as a voltage divider point. The voltage divider point is also grounded through a capacitor to reduce the influence of external interference.
[0047] In some embodiments, the control system may further include a normally closed switch detection circuit, with one end of the normally closed switch grounded and the other end connected to a power supply via a pull-up resistor. The controller can detect that the connected pin is grounded when the normally closed switch is closed. The end of the normally closed switch connected to the resistor is also grounded via a capacitor to reduce external interference when the normally closed switch is open. This end is also connected to the power supply and ground via two diodes, respectively, forming a clamping circuit to prevent excessive voltage from being generated in the circuit due to external interference.
[0048] like Figure 5 As shown, in some embodiments, the control system may further include a valve holding / closing circuit. By controlling the conduction of the fourth transistor Q4 and the fifth transistor Q13, the current to the solenoid valve can be controlled to keep it in the open state. By controlling the conduction of the sixth transistor Q5, the voltage of the solenoid valve can be pulled down, which is equivalent to short-circuiting the solenoid valve and turning it off.
[0049] In some embodiments, the control system may include a system power supply circuit. For example... Figure 6 As shown, the system power circuit may include a power conversion module that converts the 3V battery voltage to the 3.6V mains power voltage. The system power circuit may also include a switching circuit for controlling the connection and disconnection of the battery and the power conversion module. The system power circuit can be connected to the ignition switch. When the user presses the ignition switch, the switching circuit is activated, allowing power to be supplied to the controller via the power conversion module. After power-on, the controller outputs a control signal, which keeps the switching circuit active until the user turns off the stove, at which point the controller cuts off the control signal. In some embodiments not shown, the battery voltage is the same as the mains power voltage, and the system power circuit may not include a power conversion module, controlling whether the battery is connected to the mains power solely through the switching module. Therefore, the controller can be automatically activated when the user ignites the stove, and during standby, the battery consumes almost no power, significantly extending battery life.
[0050] The diagram shows only a portion of the control system circuitry. Some stove control systems include circuits corresponding to the two burners, such as two temperature detection circuits or two potentiometer detection circuits. The circuit structure and principle are the same as those shown above and will not be repeated here. The system power supply circuit and controller can typically provide power to the circuits corresponding to both burners simultaneously, generating corresponding control signals and acquiring the signals output by these circuits.
[0051] This application also provides a cooktop including a control system as described in any of the above embodiments. The cooktop employing this control system has accurate temperature detection and very low standby power consumption.
[0052] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front", "back", "up", "down", "left", "right", "horizontal", "vertical", "horizontal", "top", and "bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0053] For ease of description, relative terms such as "above," "over," "on the upper surface of," and "above" are used here to describe the regional positional relationship of one or more components or features shown in the figures to other components or features. It should be understood that relative terms include not only the orientation of the component as depicted in the figure but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.
[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.
[0055] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0056] 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 scope of the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application. The scope of protection of this application is defined by the appended claims and their equivalents.
Claims
1. A control system for a hob, characterized in that The control system comprises: a temperature detection circuit and a controller, the temperature detection circuit comprises a temperature sensor, a first resistor and a second resistor for voltage division with the temperature sensor, the first resistor and the temperature sensor are connected in series between a power supply and a ground, a first end of the first resistor and a first end of the temperature sensor are both connected to a first end of the second resistor, a resistance value of the first resistor is greater than a resistance value of the second resistor; and the controller is provided with a first signal acquisition pin and a first control pin, the first signal acquisition pin is connected to the first end of the temperature sensor to obtain a temperature detected by the temperature sensor, the first control pin is connected to a second end of the second resistor to control the second resistor, the second resistor and the first resistor are in parallel when the temperature detected by the temperature detection circuit is higher than a temperature threshold, and the second resistor is in an open circuit state when the temperature is lower than or equal to the temperature threshold.
2. The control system of claim 1, wherein, A second end of the temperature sensor is connected to the power supply, a second end of the first resistor is grounded, and the second end of the second resistor is grounded via a capacitor.
3. The control system of claim 2, wherein, The control system further comprises a first transistor, the second end of the first resistor is grounded via the first transistor, and the controller is further provided with a second control pin connected to a control end of the first transistor.
4. The control system of claim 1, wherein, The control system further comprises a diode connected in parallel with the temperature sensor.
5. The control system of claim 1, wherein, The control system further comprises a flame detection circuit, and the controller is further provided with a second signal acquisition pin, wherein: the flame detection circuit comprises a thermocouple and an amplifier module, an input end of the amplifier module is connected to the thermocouple, and an output end of the amplifier module is connected to the second signal acquisition pin.
6. The control system of claim 5, wherein, The control system further comprises a first transistor, a ground end of the amplifier module is grounded via the first transistor, and the controller is further provided with a second control pin connected to a control end of the first transistor.
7. The control system of claim 6, wherein, The control system further comprises a second transistor, a power supply end of the amplifier module is connected to a power supply via the second transistor, and a control end of the second transistor is grounded via the first transistor.
8. The control system of claim 1, wherein, The control system further comprises a series circuit, the series circuit comprises a voltage division resistor, a plurality of coding resistors and a dial switch connected in sequence, the dial switch comprises a plurality of switch elements, wherein a second end of the voltage division resistor is connected to first ends of all the coding resistors, second ends of the plurality of coding resistors are connected to first ends of the plurality of switch elements in one-to-one correspondence, and the series circuit is connected between the power supply and the ground, the controller is further provided with a third signal acquisition pin connected to the second end of the voltage division resistor.
9. The control system of claim 8, wherein, The control system further comprises a third transistor, a first end of the voltage division resistor is connected to the power supply via the third transistor, and the controller further comprises a third control pin connected to a control end of the third transistor.
10. A hob, characterized in that The control system comprises any one of claims 1 to 9.