Electronic Cigarette Output Mode Control via Coil Resistance Detection

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Solution Overview

Problem

Electronic cigarettes operating under constant voltage output modes fail to detect coil resistance, leading to issues such as dry-burn effects or reduced vapor flow, and do not provide users with varied experiences due to fixed airflow and temperature.

Innovation Solution

An electronic cigarette system with at least two output modes, including voltage and power modes, where a controller determines the output based on user inputs and coil resistance, allowing for adjustable voltage and power settings to optimize airflow and prevent overheating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If constant voltage output mode is used, then output voltage stability is improved, but coil resistance detection capability deteriorates

Engineering Contradiction:

Improveoutput voltage stabilityVSAvoidcoil resistance detection

Core Design Contradiction:

Stability of the object's compositionVSDifficulty of detecting and measuring

Solution Approach 1:

The system dynamically switches between constant voltage mode and constant power mode based on real-time coil resistance detection. When resistance is normal, constant voltage mode provides stable output; when resistance changes (indicating potential issues), the system transitions to constant power mode with active resistance monitoring, thus maintaining both voltage stability and detection capability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The controller changes the output parameter from fixed constant voltage to variable constant power mode, enabling the system to adjust output characteristics based on detected coil resistance values. This parameter change allows the system to maintain optimal performance while detecting resistance variations that indicate coil issues.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If output voltage is increased, then vapor flow temperature is improved, but risk of dry-burn effect increases

Engineering Contradiction:

Improvevapor flow temperatureVSAvoiddry-burn effect

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The system implements feedback control by continuously monitoring coil resistance and adjusting output power accordingly. When resistance increases (indicating coil heating or drying), the system reduces power output to prevent dry-burn effects, while still maintaining adequate vapor temperature through intelligent power management.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The output voltage and power are made dynamic rather than fixed, allowing the system to increase voltage for better vapor temperature when needed, then immediately adjust down when resistance monitoring indicates approaching dry-burn conditions, creating a responsive temperature control system.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If output voltage is decreased, then dry-burn effect is reduced, but vapor flow amount decreases

Engineering Contradiction:

Improvedry-burn effectVSAvoidvapor flow amount

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The system changes from fixed voltage output to variable power output, allowing it to maintain higher voltage for adequate vapor production while dynamically adjusting power based on resistance feedback to prevent dry-burn effects, thus achieving both goals simultaneously through intelligent parameter management.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If single constant voltage mode is used, then device simplicity is improved, but user experience variety deteriorates

Engineering Contradiction:

Improvedevice simplicityVSAvoiduser experience variety

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The controller is designed to perform multiple functions: it operates in constant voltage mode for simplicity, constant power mode for resistance monitoring, and can switch between modes based on conditions. This multi-functionality provides varied user experiences while maintaining relatively simple device architecture through unified control logic.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables users to select preferred output modes, ensuring optimal airflow and preventing coil damage, thereby enhancing user experience and device performance by adjusting voltage and power according to coil resistance.

Implementation Method 1

a coil in the electronic cigarette generates more heat as the output voltage increases

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS11160140B2Electronic cigarette with at least two output modes and method for controlling the electronic cigarette

Publication Date: 2021.10.26 JOYETECH CHANGZHOU ELECTRONICS

AI summary

A method for controlling an electronic cigarette with at least two output modes includes detecting whether a switch signal for the stored output modes is input when the electronic cigarette is in a locked state. The stored output mode is switched in response to the switch signal. The electronic cigarette is controlled to operate according to the stored output mode, and an output of the electronic cigarette is controlled in response to a smoking request signal when the electronic cigarette is unlocked. The user can select a desired output mode according to need, there increasing the user experience.