Electronic Cigarette Temperature Control Circuit Using Thermocouple Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electronic cigarette temperature adjustment control circuits have low accuracy due to reliance on resistance and current value estimation, leading to potential atomizer damage from excessive heating.
Innovation Solution
An intelligent temperature adjustment control circuit that includes resistance, current, and voltage sampling circuits, combined with a thermocouple sensor and analog-to-digital converter, to directly measure and accurately control the heating wire temperature, using a main control unit to adjust power and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature is estimated by collecting resistance and current values, then the control circuit can be simpler, but the measurement precision is lower leading to higher error rate
Solution Approach 1:
The patent introduces a thermocouple sensor as an intermediary device that directly contacts the heating wire to detect its real-time temperature. This mediator provides accurate temperature data without requiring complex calculation circuits, resolving the contradiction by using a simple sensor to achieve high measurement precision while maintaining circuit simplicity.
Solution Approach 2:
The patent replaces the indirect electrical estimation method (using resistance and current values to calculate temperature) with a direct thermal detection method (using thermocouple sensor to measure temperature). This substitution of measurement approach achieves high precision temperature measurement without increasing control circuit complexity.
2Reliability
If temperature control precision is improved by using estimation methods, then atomizer damage can be prevented, but the control accuracy remains insufficient
Solution Approach 1:
The patent implements a real-time temperature feedback system where the thermocouple sensor continuously monitors the heating wire temperature and sends signals to the control circuit. The control circuit adjusts power delivery based on this feedback to maintain temperature within safe ranges, providing both high reliability for atomizer protection and high control accuracy through continuous monitoring and adjustment.
Solution Approach 2:
The thermocouple sensor acts as a mediator that provides direct and accurate temperature information from the heating wire to the control circuit. This intermediary device enables reliable atomizer protection by ensuring the control system has precise real-time temperature data to prevent overheating damage.
3Measurement precision
If direct temperature detection is implemented using thermocouple sensor, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The thermocouple sensor is integrated directly with the heating wire structure, allowing temperature detection without adding separate complex detection circuits. This intermediary approach achieves high measurement precision while minimizing increases in overall device complexity through straightforward integration.
Solution Approach 2:
The control circuit is designed to handle multiple functions including power delivery, temperature monitoring, and safety control through a unified system architecture. By making the control circuit multi-functional, the patent avoids the need for separate dedicated circuits for each function, thereby reducing overall device complexity while achieving high temperature detection precision.
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
This solution provides precise real-time temperature control, reducing the risk of atomizer damage and extending its lifespan by accurately managing heating wire power.
Implementation Method 1
a thermocouple sensor connected to the heating wire of the atomizer and configured to collect real-time temperature data of the heating wire in the heated state and convert it to a corresponding voltage signal value
Implementation Method 2
a signal isolation driving circuit connected to the analog-to-digital converter and comprising at least one optocoupler for transmitting the voltage digital signal to a main control unit via a photoelectric coupling transmission way
Implementation Method 3
a heating wire of an atomizer used on the electronic cigarette
Data Source
AI summary
An intelligent temperature adjustment control circuit includes a first, resistance sampling circuit, a second resistance sampling circuit, a current sampling circuit, a voltage sampling circuit and a thermocouple sensor, respectively connected to a heating wire. The thermocouple sensor is connected in turn with an analog-to-digital converter and a signal isolation driving circuit to collect real-time temperature data of the heating wire and then transmit it to a main control unit after being processed. The main control unit is configured to determine the received initial resistance value, the real-time resistance value, the real-time current value, the real-time voltage value and the voltage digital signal, and then send a control signal to a main driving circuit according to a judgment result of the received initial resistance value, the real-time resistance value, the real-time current value, the real-time voltage value and the voltage digital signal, that have been determined.