A temperature control system for a smart pot

Abstract

This utility model relates to the field of smart cookware technology, specifically disclosing a temperature control system for smart cookware, comprising: a temperature acquisition module, including a temperature sensor and a signal conditioning circuit, the signal conditioning circuit including an instrumentation amplifier and a low-pass filter connected in sequence, the output terminal of the temperature sensor being electrically connected to the input terminal of the instrumentation amplifier; a core control unit, the signal input terminal of the core control unit being electrically connected to the output terminal of the low-pass filter; a power regulation module, including a PWM generation circuit and a power drive circuit, the control terminal of the PWM generation circuit being electrically connected to the PWM output terminal of the core control unit, the input terminal of the power drive circuit being electrically connected to the output terminal of the PWM generation circuit; and an adaptive power management unit, including a DC-DC conversion circuit, the DC-DC conversion circuit being electrically connected to the temperature acquisition module, the core control unit, and the power regulation module respectively; this invention solves the problems of unstable structure, inaccurate temperature measurement, and weak anti-interference capability in the temperature control system of smart cookware.

Description

Technical Field

[0001] This utility model relates to the field of smart cookware technology, specifically to a temperature control system for smart cookware. Background Technology

[0002] Currently, most smart cookware temperature control systems on the market use temperature sensors to detect the cookware temperature and microprocessors to control the heating power. However, these systems still have significant shortcomings in application. On the one hand, the temperature acquisition process is susceptible to environmental noise interference, especially when using infrared temperature sensors, where the signal conditioning accuracy and anti-interference capability are insufficient, affecting the accuracy of the final temperature measurement. On the other hand, the core control unit and power drive module within the system have high requirements for power supply stability and quality. Traditional power supply methods are prone to voltage fluctuations when multiple modules work together, and lack a rapid response mechanism for abnormal power conditions, affecting the overall reliability of the system and the stability of heating control.

[0003] Furthermore, existing power regulation modules are prone to electromagnetic interference during switching, which can affect the normal operation of the control unit, leading to unstable communication or control failure. At the same time, the overall electromagnetic compatibility design of the system is often inadequate, making its performance susceptible to impacts in complex electromagnetic environments. Therefore, there is an urgent need for an intelligent pot temperature control system solution that can simultaneously improve temperature acquisition accuracy, power management adaptability, power control stability, and overall electromagnetic compatibility. Utility Model Content

[0004] The purpose of this invention is to provide a temperature control system for smart pots, which solves the problems of unstable structure, inaccurate temperature measurement, and weak anti-interference ability of current smart pot temperature control systems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A temperature control system for a smart pot includes: a temperature acquisition module comprising a temperature sensor and a signal conditioning circuit, the signal conditioning circuit comprising an instrumentation amplifier and a low-pass filter connected in sequence, the output terminal of the temperature sensor being electrically connected to the input terminal of the instrumentation amplifier; a core control unit, the signal input terminal of the core control unit being electrically connected to the output terminal of the low-pass filter; a power regulation module comprising a PWM generation circuit and a power drive circuit, the control terminal of the PWM generation circuit being electrically connected to the PWM output terminal of the core control unit, the input terminal of the power drive circuit being electrically connected to the output terminal of the PWM generation circuit; and an adaptive power management unit comprising a DC-DC conversion circuit, the output terminal of the DC-DC conversion circuit being electrically connected to the power input terminals of the temperature acquisition module, the core control unit, and the power regulation module, respectively.

[0007] A further technical solution is that the power regulation module further includes a current sampling feedback circuit, which is electrically connected to the current feedback input terminal of the core control unit; the adaptive power management unit includes a power anomaly detection circuit, the output terminal of which is electrically connected to the anomaly detection input terminal of the core control unit.

[0008] A further technical solution is that the core control unit adopts a microprocessor with wireless communication function, and the radio frequency front-end of the core control unit is provided with a matching network. The matching network includes multiple parallel capacitor branches, and each capacitor branch is connected to the GPIO pin of the core control unit through a switching transistor.

[0009] A further technical solution is that the temperature sensor is an infrared temperature sensor, and the low-pass filter is a second-order RC active filter.

[0010] A further technical solution is that the power drive circuit includes a driver chip and a MOSFET, the input terminal of the driver chip is electrically connected to the output terminal of the PWM generation circuit, and the output terminal of the driver chip is electrically connected to the gate of the MOSFET.

[0011] A further technical solution includes an EMC enhancement circuit, which comprises a TVS diode and a signal isolation optocoupler, connected in series between the core control unit and the wireless communication module.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model provides a temperature control system for smart cookware. Through a temperature sensor and signal conditioning circuit, it achieves fast response speed for accurate temperature detection, resulting in precise temperature measurement. A low-pass filter and EMC enhancement circuit effectively suppress electromagnetic interference, improving the signal-to-noise ratio and significantly enhancing temperature control stability. Digital PWM control enables continuous power adjustment from 100W to 2000W, coupled with current feedback closed-loop control, resulting in even higher accuracy. Multi-level power management reduces standby power consumption, and a power anomaly detection function enhances electrical safety. It boasts good compatibility, supports wireless communication and external terminal linkage, and can be integrated into various smart cookware, making it easy to promote and apply. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a temperature control system for a smart pot provided by this utility model.

[0015] Icons: Adaptive power management unit 1000, DC-DC conversion circuit 1100, power anomaly detection circuit 1200, temperature acquisition module 2000, temperature sensor 2100, signal conditioning circuit 2200, instrumentation amplifier 2210, low-pass filter 2220, core control unit 3000, power regulation module 4000, PWM generation circuit 4100, power drive circuit 4200, current sampling feedback circuit 4300, EMC enhancement circuit 5000. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Example 1

[0018] This utility model embodiment provides a temperature control system for a smart pot, such as... Figure 1 As shown, the system includes a temperature acquisition module 2000, a core control unit 3000, a power regulation module 4000, and an adaptive power management unit 1000. These modules are interconnected via circuitry to work collaboratively. Specifically, the temperature acquisition module 2000 includes a temperature sensor 2100 and a signal conditioning circuit 2200. The temperature sensor 2100 is an infrared temperature sensor, model BM43THA-M16, used to acquire the real-time temperature of the pot body, with a measurement range of -20℃ to 300℃. The signal conditioning circuit 2200 is a high-precision signal conditioning circuit, comprising an instrumentation amplifier 2210 and an instrumentation amplifier 2210 connected in sequence. The low-pass filter 2220, wherein the instrumentation amplifier 2210 can be an AD8232 instrumentation amplifier, and the low-pass filter 2220 is a second-order RC active low-pass filter. The output terminal of the temperature sensor 2100 is electrically connected to the input terminal of the instrumentation amplifier 2210. The instrumentation amplifier 2210 is used to amplify the weak signal output by the temperature sensor 2100. The amplification factor can be adjusted through the I2C interface of the core control unit 3000. The low-pass filter 2220 switches the cutoff frequency (the cutoff frequency can be selected as 10Hz / 50Hz / 100Hz) through the GPIO pin of the core control unit 3000 to suppress high-frequency electromagnetic interference in the kitchen, thereby improving the signal-to-noise ratio.

[0019] Furthermore, the core control unit 3000 is an RTL8772GWF chip, employing a microprocessor with wireless communication capabilities. It has a built-in Real-M300V MCU core. The core control unit 3000 is electrically connected to the temperature acquisition module 2000, receiving and processing the conditioned temperature signal. The signal input terminal of the core control unit 3000 is electrically connected to the output terminal of the low-pass filter 2220. The RF front-end of the core control unit 3000 is equipped with a matching network, which includes multiple parallel capacitor branches. Each capacitor branch is connected to the GPIO pin of the core control unit 3000 through a switching transistor. The matching network also supports Mesh BLE wireless communication. The core control unit 3000 also supports outputting PWM control signals to the power regulation module 4000 to achieve closed-loop control.

[0020] Furthermore, the power regulation module 4000 includes a PWM generation circuit 4100 and a power drive circuit 4200. The control terminal of the PWM generation circuit 4100 is electrically connected to the PWM output terminal of the core control unit 3000 so that the PWM generation circuit 4100 can receive the PWM signal output by the core control unit 3000. The input terminal of the power drive circuit 4200 is electrically connected to the output terminal of the PWM generation circuit 4100. The adaptive power management unit 1000 includes a DC-DC conversion circuit 1100. The DC-DC conversion circuit 1100 uses an ETA1061V33S2G chip and switches the output voltage to 3.3V (core module), 5V (sensor and drive circuit), and 12V (display module) through the SPI interface of the core control unit 3000. It automatically shuts off the power supply to unnecessary modules during standby.

[0021] In one embodiment, the power regulation module 4000 further includes a current sampling feedback circuit 4300, which is electrically connected to the current feedback input terminal of the core control unit 3000. The current sampling feedback circuit 4300 monitors the heating current in real time through a series precision shunt resistor and a differential amplifier, and transmits the feedback signal to the core control unit 3000. The adaptive power management unit 1000 includes a power abnormality detection circuit 1200, whose output terminal is electrically connected to the abnormality detection input terminal of the core control unit 3000. The power abnormality detection circuit 1200 consists of an LM393 voltage comparator and a precision voltage divider resistor network. It monitors the input voltage (after rectification of AC 220V). When overvoltage (e.g., when the voltage is ≥264V), undervoltage (≤187V), or surge (≥300V / 10μs) is detected, it sends an abnormal signal to the core control unit 3000 to trigger the heating circuit cut-off protection.

[0022] In this embodiment of the utility model, the power drive circuit 4200 includes a drive chip and a MOSFET. The input terminal of the drive chip is electrically connected to the output terminal of the PWM generation circuit 4100, and the output terminal of the drive chip is electrically connected to the gate of the MOSFET. The PWM signal is converted into a drive signal for the heating element (such as a heating tube and an IH coil) to achieve continuously adjustable power from 100W to 2000W.

[0023] In this embodiment of the utility model, an EMC enhancement circuit 5000 is also included. The EMC enhancement circuit 5000 includes a TVS diode and a signal isolation optocoupler, which are connected in series between the core control unit 3000 and the wireless communication module to improve the system's anti-electromagnetic interference capability.

[0024] Working Principle: After the system is powered on, the adaptive power management unit outputs an appropriate voltage to power the temperature acquisition modules, the core control unit, and the power regulation module. The temperature acquisition module obtains the pot temperature through a sensor, and the filtered temperature data transmitted by the temperature sensor is amplified by the instrumentation amplifier of the signal conditioning circuit and then transmitted to the core control unit. The core control unit sends the measured temperature to the PWM generation circuit of the power regulation module. The PWM generation circuit compares the measured temperature with a preset curve and generates a PWM signal to drive the power drive circuit of the power regulation module to adjust the heating power. The current sampling feedback circuit and the power anomaly detection circuit monitor the system status in real time to ensure power stability and electrical safety. At the same time, the core control unit interacts with the external terminal through the Mesh Ble wireless communication module to synchronize temperature data and control commands.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] Precise Temperature Measurement: Utilizing a high-precision infrared sensor and signal conditioning circuitry, temperature detection accuracy is improved, with a fast response speed to meet the demands of delicate cooking. Strong Anti-interference: A low-pass filter and EMC enhancement circuit effectively suppress electromagnetic interference, improving the signal-to-noise ratio and significantly enhancing temperature control stability. Adjustable Power: Digital PWM control enables continuous power adjustment from 100W to 2000W, coupled with current feedback closed-loop control, adapting to diverse cooking scenarios. Intelligent Energy Saving: Multi-level power management significantly reduces standby power consumption, and power anomaly detection enhances electrical safety. Good Compatibility: Supports wireless communication and external terminal linkage, and can be integrated into various smart cookware, facilitating widespread application.

[0027] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the drawings and claims disclosed herein. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A temperature control system for a smart pot, characterized in that, include: The temperature acquisition module (2000) includes a temperature sensor (2100) and a signal conditioning circuit (2200). The signal conditioning circuit (2200) includes an instrumentation amplifier (2210) and a low-pass filter (2220) connected in sequence. The output terminal of the temperature sensor (2100) is electrically connected to the input terminal of the instrumentation amplifier (2210). The core control unit (3000) is electrically connected to the output of the low-pass filter (2220). The power regulation module (4000) includes a PWM generation circuit (4100) and a power drive circuit (4200). The control terminal of the PWM generation circuit (4100) is electrically connected to the PWM output terminal of the core control unit (3000), and the input terminal of the power drive circuit (4200) is electrically connected to the output terminal of the PWM generation circuit (4100). The adaptive power management unit (1000) includes a DC-DC conversion circuit (1100), the output of which is electrically connected to the power input of the temperature acquisition module (2000), the core control unit (3000), and the power regulation module (4000).

2. The temperature control system for a smart pot according to claim 1, characterized in that, The power regulation module (4000) also includes a current sampling feedback circuit (4300), which is electrically connected to the current feedback input terminal of the core control unit (3000). The adaptive power management unit (1000) includes a power anomaly detection circuit (1200), the output of which is electrically connected to the anomaly detection input of the core control unit (3000).

3. The temperature control system for a smart pot according to claim 2, characterized in that, The core control unit (3000) employs a microprocessor with wireless communication capabilities. The radio frequency front-end of the core control unit (3000) is equipped with a matching network, which includes multiple parallel capacitor branches. Each capacitor branch is connected to the GPIO pin of the core control unit (3000) through a switching transistor.

4. A temperature control system for a smart pot according to claim 2, characterized in that, The temperature sensor (2100) is an infrared temperature sensor (2100), and the low-pass filter (2220) is a second-order RC active filter.

5. A temperature control system for a smart pot according to claim 2, characterized in that, The power drive circuit (4200) includes a drive chip and a MOS transistor. The input terminal of the drive chip is electrically connected to the output terminal of the PWM generation circuit (4100), and the output terminal of the drive chip is electrically connected to the gate of the MOS transistor.

6. A temperature control system for a smart pot according to claim 1, characterized in that, It also includes an EMC enhancement circuit (5000), which includes a TVS diode and a signal isolation optocoupler, connected in series between the core control unit (3000) and the wireless communication module.

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