E-Cigarette Temperature Control via Resistance Feedback
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Solution Overview
Problem
Conventional electronic cigarettes suffer from burning smell due to high heating wire temperatures and inconsistent flavor caused by unstable temperature fluctuations, which are not adequately addressed by existing voltage control modes.
Innovation Solution
An electronic cigarette with a temperature detecting module that adjusts the voltage output to maintain the heating wire temperature within a preset range, using a heating wire with positive temperature coefficient resistance, and additional modules for smoking detection and tobacco liquid management to ensure consistent flavor and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If constant voltage or battery-voltage-dependent control mode is used, then the heating wire temperature increases with smoking time, but the tobacco liquid will be cracked and release burning smell
Solution Approach 1:
The patent implements a feedback control mechanism where the microcontroller continuously monitors the voltage across the heating wire and adjusts the power output accordingly. The control module detects the actual voltage and compares it with reference values to determine the appropriate power output level, creating a closed-loop system that prevents temperature-related harmful effects.
Solution Approach 2:
The patent transitions from static voltage control (constant voltage or fixed battery-voltage dependency) to dynamic voltage control. The heating wire voltage is dynamically adjusted based on real-time detection of voltage values, allowing the system to adapt the heating power according to actual conditions and prevent excessive temperature rise.
2Ease of operation
If constant voltage or battery-voltage-dependent control mode is used, then the voltage output is simple to control, but the temperature of the heating wire varies relatively large causing inconsistent flavor
Solution Approach 1:
The patent implements a feedback control mechanism where the microcontroller continuously monitors the voltage across the heating wire and adjusts the power output accordingly. The control module detects the actual voltage and compares it with reference values to determine the appropriate power output level, creating a closed-loop system that maintains stable temperature for consistent flavor.
Solution Approach 2:
The patent changes the control parameter from simple on/off or fixed voltage modes to continuous voltage adjustment based on detected voltage values. By varying the heating wire voltage according to detected parameters (voltage thresholds), the system achieves stable temperature control while maintaining operational simplicity through automated parameter adjustment.
3Reliability
If the voltage of lithium battery drops below threshold, then the micro controller stops outputting voltage to protect the battery, but the smoking experience is interrupted
Solution Approach 1:
The patent applies preliminary action by detecting voltage trends before the battery voltage drops below the shutdown threshold. The control module monitors voltage variations and predicts when the battery will reach critical levels, allowing the system to prepare for battery replacement or warn the user in advance, thus avoiding abrupt interruption of the smoking experience.
Solution Approach 2:
The patent introduces an intermediary detection and control mechanism between the battery and the heating wire. The voltage detection module and control module act as intermediaries that monitor battery status and manage power delivery, providing a buffer that allows for graceful degradation or user notification before complete power failure occurs.
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 effectively prevents burning smell by maintaining the heating wire temperature within optimal vaporization ranges, ensuring consistent flavor and reducing power consumption by dynamically adjusting voltage based on real-time temperature and smoking habits.
Implementation Method 1
control a heating wire to vaporize tobacco liquid
Implementation Method 2
a heating wire having a resistance that varies with temperature; the heating wire has a positive temperature coefficient
Data Source
AI summary
An electronic cigarette and a control method thereof are provided. An electronic cigarette with a heating wire component used for producing heat, where the heating wire component comprises a heating wire having a resistance that varies with temperature; a power source used for providing the heating component with a voltage; and, a controller electrically coupled to the heating wire component and the power source and used for controlling the voltage outputted by the power source. The controller comprises a temperature detection module used for detecting the resistance of the heating wire and thus acquiring the actual temperature of the heating wire component. The temperature detection module presets an upper limit heating temperature and a lower limit heating temperature.