Metal Heating Sheet Temperature Control for Electronic Smoking
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Solution Overview
Problem
Current electronic smoking devices with ceramic heating sheets face challenges in accurate temperature control and ease of cleaning due to temperature detection errors and the hardness of the heating sheets, affecting the taste and cleanliness of the device.
Innovation Solution
A temperature controller using a metal heating sheet that detects actual temperature by measuring resistance, allowing for precise control and easy cleaning, with a controller comprising a power drive unit, analog-to-digital conversion unit, and real-time resistance detection unit to adjust output power and maintain constant temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a ceramic heating sheet is used with temperature sensors to detect ambient temperature, then the device structure is simple, but the temperature control accuracy is poor due to detection errors
Solution Approach 1:
The patent combines the heating function and temperature detection function into a single metal heating sheet. The metal heating sheet serves dual purposes: as a heating element and as a temperature sensor through its resistance changes. This eliminates the need for separate temperature sensors and resolves the contradiction by improving measurement precision while maintaining simple device structure.
Solution Approach 2:
The metal heating sheet performs multiple functions simultaneously: it heats the tobacco and detects temperature through resistance changes. This multi-functionality approach allows the same component to serve as both actuator and sensor, achieving accurate temperature control without adding complex detection systems.
2Ease of operation
If a ceramic heating sheet is used, then the heating sheet can maintain temperature, but the hardness is insufficient to clean redundant tobacco
Solution Approach 1:
The patent changes the material parameter of the heating sheet from ceramic to metal. Metal materials provide both the necessary thermal properties for temperature maintenance and the mechanical hardness required for easy cleaning of redundant tobacco, thus resolving the contradiction between ease of operation and strength.
3Measurement precision
If a metal heating sheet is used to detect real-time resistance for temperature control, then the temperature control accuracy is high, but the heating sheet requires precise power adjustment
Solution Approach 1:
The patent implements a feedback control system where the metal heating sheet's resistance is continuously monitored and used to adjust the power input. The controller receives resistance signals from the heating sheet, converts them to temperature information, and adjusts power accordingly to maintain the desired temperature. This feedback mechanism achieves high temperature detection accuracy while managing power control through automated control algorithms.
4Speed
If ceramic heating sheets are used, then the structure is stable, but the heating time to reach desired temperature is long
Solution Approach 1:
The patent changes the material composition parameter from ceramic to metal. Metal materials have superior thermal conductivity compared to ceramics, enabling faster heat distribution and quicker attainment of desired temperature. The metal heating sheet maintains structural stability through proper material selection and design, thus resolving the contradiction between heating speed and structural stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high accuracy and reliability in temperature control, faster heating times, and improved durability and cleanliness, enabling consumers to adjust temperature according to taste preferences while reducing waiting time and operational costs.
Implementation Method 1
the actual temperature of the heating sheet according to the present invention can be determined by detecting the resistance value of the metal heating sheet since the resistivity of the metal material has a good linear proportional relationship with the temperature
Implementation Method 2
since the thermal conductivity of the metal is much better than that of the ceramic, the electronic smoking device using the metal heating sheet of the present application has a short waiting time for reaching the desired temperature
Data Source
AI summary
A temperature controller for electronic smoking device includes a metal heating sheet for heating a cigarette and a controller for controlling temperature of the heating sheet by collecting a real-time resistance of the heating sheet. The power drive unit is electrically connected to a power source and the heating sheet respectively, the control unit is electrically connected to the power drive unit and the real-time resistance detection unit respectively, and the analog-to-digital conversion unit is configured to convert an analog signal output by the real-time resistance detection unit into a digital signal that is transmitted to the control unit. The real-time resistance detection unit is configured to detect a real-time resistance of the heating sheet, and the control unit is configured to adjust an output power of the power drive unit according to the real-time resistance of the heating sheet. The controller realizes precise temperature control and convenient operation.