Temperature control circuit of battery-powered incense burner

Abstract

The utility model discloses a temperature control circuit of a battery-powered incense burner, which comprises a temperature probe used for monitoring the temperature of a heating sheet in real time; the voltage-stabilized power supply is composed of two-stage voltage-stabilized power supply; the ADC channel is used for detecting the battery voltage and converting the battery voltage into a digital signal; the single chip microcomputer is used for determining the corresponding power of the heating sheet according to the detected voltage and target temperature through a table look-up function; the heating sheet is used for receiving the control signal from the single chip microcomputer so as to adjust power output; the MOS tube is used for calculating a PWM duty ratio according to the resistance value of the heating sheet and controlling the working state of the heating sheet; the feedback control module is used for controlling the PWM value of the heating sheet when the deviation between the test temperature and the required temperature is large or small; according to the temperature control circuit of the battery-powered incense burner, the battery voltage is detected in real time, the heating piece is controlled to be at constant power, the temperature of the heating piece is made to be close to the actually-needed temperature, and then the power of the heating piece is slightly increased or reduced through optimized data.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature control circuits, in particular to a temperature control circuit of a battery-powered incense burner. Background Art

[0002] Due to the usage habits and current structure of electric incense burners, the layout of the heating and temperature probes is as follows Figure 1 :The probe is placed under the heating plate, but the heating object is placed on the surface of the heating plate. The actual temperature control point and the probe are separated by the heating plate. When a large current is discharged, the battery voltage changes greatly. As a result, when only the temperature probe feedback is used for temperature control, there will be a delay between the probe data and the actual data. In addition, the power fluctuation of the heating plate is large, and the temperature control is not accurate enough. Its structure is as follows Figure 1 shown. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a temperature control circuit for a battery-powered incense burner. By detecting the battery voltage in real time and controlling the heating plate at a constant power according to the required temperature, the temperature of the heating plate is kept close to the actual required temperature, thereby making the temperature more accurate.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A temperature control circuit for a battery-powered incense burner, comprising:

[0006] Temperature probe, used to monitor the temperature of the heating element in real time;

[0007] The voltage-stabilized power supply consists of a two-stage voltage-stabilized power supply;

[0008] ADC channel, used to detect battery voltage and convert it into a digital signal;

[0009] The single chip microcomputer determines the corresponding heating plate power according to the detected voltage and target temperature through the table lookup function;

[0010] The heating element is used to receive the control signal from the single chip microcomputer to adjust the power output;

[0011] MOS tube, used to calculate the PWM duty cycle according to the resistance of the heating element and control the working state of the heating element;

[0012] The feedback control module is based on the temperature measurement circuit of the high-precision probe. When the test temperature deviates greatly or less from the required temperature, it controls the PWM value of the heating plate.

[0013] Preferably, the voltage-stabilized power supply includes a reference chip with a 0.2% accuracy, a 0.1% matching resistor, an RC filter circuit and an LDO primary voltage regulator.

[0014] Preferably, the ADC channel is a 12-bit ADC.

[0015] Preferably, a power supply battery is also included for supplying power to the voltage-stabilized power supply, the ADC channel and the MOS tube.

[0016] Beneficial effects:

[0017] Compared with the prior art, the present invention provides a temperature control circuit for a battery-powered incense burner, which has the following beneficial effects: the present invention detects the battery voltage through the ADC detection channel, and the single-chip microcomputer determines the heating plate power corresponding to the required temperature by looking up the table. By detecting the battery voltage in real time, the heating plate is controlled to a constant power according to the required temperature, so that the temperature of the heating plate is close to the actual required temperature. Since the power of the heating plate will only change slightly, the delay effect of the temperature probe can be alleviated, thereby making the temperature more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the heating part of an existing electric incense burner;

[0019] Figure 2 This is a schematic diagram of the temperature control scheme of the electric incense burner of the utility model. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the temperature control circuit of the battery-powered incense burner of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] See also Figure 2 As shown, a temperature control circuit of a battery-powered incense burner includes:

[0022] Temperature probe, used to monitor the temperature of the heating element in real time;

[0023] The voltage-stabilized power supply consists of a two-stage voltage-stabilized power supply;

[0024] ADC channel, used to detect battery voltage and convert it into a digital signal;

[0025] The single chip microcomputer determines the corresponding heating plate power according to the detected voltage and target temperature through the table lookup function;

[0026] The heating element is used to receive the control signal from the single chip microcomputer to adjust the power output;

[0027] MOS tube, used to calculate the PWM duty cycle according to the resistance of the heating element and control the working state of the heating element;

[0028] The feedback control module is based on the temperature measurement circuit of the high-precision probe. When the test temperature deviates greatly or less from the required temperature, it controls the PWM value of the heating plate.

[0029] The temperature control circuit of the battery-powered incense burner adopts the mode of double-clicking the power button to turn on the burner and single-clicking the power button to turn off the burner for power on and off control.

[0030] The temperature control circuit of the battery-powered incense burner operates as follows:

[0031] 1. Prepare the utensils and spices, double-click the power button twice, the red light will turn on, and the aroma analyzer will start heating; it will automatically shut down after heating for 90 seconds. During the heating process, short press the power button once to stop heating;

[0032] 2. If the red light flashes during heating, it means the battery is in low power state and should be charged in time;

[0033] 3. The indicator light flashes yellow when charging and turns green when fully charged.

[0034] A high-precision temperature probe is used to monitor the temperature of the heating element in real time to ensure that the incense burner operates within the predetermined temperature range, thereby improving its performance and safety. A two-stage voltage-regulated power supply design ensures stable system power supply, thereby reducing the impact of voltage fluctuations on performance during temperature measurement and control, and improving overall reliability. The battery voltage is detected through the ADC channel, and the analog signal is converted into a digital signal. The microcontroller can monitor the battery status in real time, extending battery life and optimizing power consumption.

[0035] The single-chip microcomputer has a table lookup function, which can quickly adjust the power of the heating plate according to the real-time detected voltage and target temperature, realize intelligent control, improve the response speed and adaptability of the system; the MOS tube controls the PWM duty cycle, which can accurately adjust the power output of the heating plate, make the temperature change more stable, reduce temperature fluctuations, and thus improve the user experience; the feedback control module dynamically adjusts according to the deviation between the actual measured temperature and the target temperature. Regardless of the size of the deviation, it can respond in time to ensure that the incense burner operates in the best working condition.

[0036] This solution precisely controls the power output of the heating element, avoiding unnecessary energy waste and extending battery life, in line with modern energy-saving and environmental protection concepts. The system structure is relatively simple and easy to maintain. At the same time, the modular design allows for easy upgrades or expansions in the future, such as adding more sensors or improving control algorithms. The temperature control system can accurately set the desired incense temperature, enhancing the user experience and improving the incense effect. The combination of high-precision probes and feedback control mechanisms can effectively avoid overheating or temperature runaway, improve product safety, and protect users and equipment.

[0037] The voltage-stabilized power supply includes a 0.2% accuracy reference chip, a 0.1% matching resistor, an RC filter circuit, and an LDO primary voltage regulator. The ADC channel is a 12-bit ADC. It also includes a power supply battery for the voltage-stabilized power supply, the ADC channel, and the MOS tube.

[0038] The 0.2% precision reference chip ensures the stability and accuracy of the supply voltage, providing a reliable power supply foundation for the entire circuit and reducing measurement errors caused by unstable power supply. The 0.1% matching resistor further improves the accuracy of the circuit, ensuring that errors are controlled within a smaller range during the measurement and control process, thereby improving the overall performance of the system.

[0039] The RC filter circuit effectively reduces high-frequency noise in the power supply, providing a clean power signal, ensuring that subsequent circuits (such as ADC channels and MOS tubes) are not interfered with during operation, thereby improving the system's anti-interference ability; the LDO primary voltage regulator provides low-voltage difference voltage regulation capability, which can effectively reduce energy loss in the power management process and improve overall energy efficiency, making it suitable for battery-powered occasions.

[0040] The 12-bit ADC channel provides up to 4096 different voltage readings, making voltage detection more precise, thereby enhancing the accuracy of temperature measurement and control and supporting the implementation of refined control strategies. The power supply battery provides an independent power supply for the entire system, enhancing the system's mobility and flexibility, making it suitable for the design of portable devices and convenient for users to use in different occasions.

[0041] The entire design focuses on low power consumption, making it suitable for devices with long operating times, reducing the hassle of frequent battery replacement and improving the user experience. The solution's design allows for smooth coordination between different modules (voltage regulator, ADC channel, MOS tube), facilitating subsequent upgrades and maintenance, and enhancing the system's scalability. Combining high-precision voltage regulation with a 12-bit ADC channel allows the system to respond quickly to temperature changes, ensuring that the incense burner maintains stable performance under various usage conditions.

[0042] Reliable, regulated power supplies and sophisticated battery management can effectively prevent overvoltage or undervoltage conditions, thereby reducing the risk of damage to circuit components and improving the overall safety of the device. Efficient design reduces the need for additional protection circuits, saving manufacturing costs and improving the product's market competitiveness.

[0043] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A temperature control circuit for a battery-powered incense burner, characterized in that: Includes: Temperature probe, used to monitor the temperature of the heating element in real time; The voltage-stabilized power supply consists of a two-stage voltage-stabilized power supply; ADC channel, used to detect battery voltage and convert it into a digital signal; The single chip microcomputer determines the corresponding heating plate power according to the detected voltage and target temperature through the table lookup function; The heating element is used to receive the control signal from the single chip microcomputer to adjust the power output; MOS tube, used to calculate the PWM duty cycle according to the resistance of the heating element and control the working state of the heating element; The feedback control module is based on the temperature measurement circuit of the high-precision probe. When the test temperature deviates greatly or less from the required temperature, it controls the PWM value of the heating plate.

2. The temperature control circuit of a battery-powered incense burner according to claim 1, characterized in that: The voltage-stabilized power supply includes a reference chip with 0.2% accuracy, a 0.1% matching resistor, an RC filter circuit and an LDO primary voltage regulator.

3. The temperature control circuit of a battery-powered incense burner according to claim 2, characterized in that: This ADC channel is a 12-bit ADC.

4. The temperature control circuit of a battery-powered incense burner according to claim 3, characterized in that: It also includes a power supply battery for supplying power to the voltage regulator, ADC channel and MOS tube.

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