Atomizer Heating Control Using PWM to Prevent Dry Burning
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Solution Overview
Problem
Existing electronic atomization devices face issues with dry burning, leading to the production of harmful substances and burnt smells due to poor liquid flow and excessive heating, which can endanger human health.
Innovation Solution
An electronic atomization device with a control unit that uses PWM control signals to maintain a constant temperature, calculates effective output power, and adjusts heating based on liquid content, including real-time resistance and temperature measurements, to prevent dry burning by reducing power or stopping heating when abnormal liquid content is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the atomization unit continues heating after liquid is exhausted, then the heating temperature increases, but harmful substances are produced and burnt smell is generated
Solution Approach 1:
The control unit continuously monitors the heating resistance of the atomization unit and calculates effective output power in real-time. When liquid content becomes abnormal (causing resistance changes), the system detects this through feedback and automatically adjusts by reducing power or stopping heating, preventing harmful substance generation while maintaining safe operating temperatures
Solution Approach 2:
The system performs preliminary detection of liquid content status by monitoring heating resistance before harmful burning occurs. By calculating effective output power in advance and comparing it with normal ranges, the system takes preventive action to stop heating before the atomization unit reaches dangerous temperatures that would produce burnt smell and harmful substances
2Quantity of substance
If the liquid flow in the liquid guiding element is poor, then the liquid cannot be smoothly guided to the heating element, but the heating element overheats and produces harmful substances
Solution Approach 1:
The control unit uses feedback from heating resistance measurements to infer liquid flow status. When liquid flow becomes poor, the heating resistance changes, and the system detects this through continuous monitoring and automatic adjustment, preventing overheating and harmful substance production
Solution Approach 2:
The system replaces direct mechanical monitoring of liquid flow with an electrical measurement approach. By measuring heating resistance and calculating effective output power, the system indirectly detects liquid content status without requiring direct contact with the liquid, enabling non-invasive monitoring and control
3Temperature
If the temperature control is not precise, then the heating process is simple, but dry burning occurs and harmful substances are produced
Solution Approach 1:
The system implements precise temperature control through feedback by continuously monitoring heating resistance and calculating effective output power. This real-time feedback enables the control unit to maintain optimal heating temperature and prevent dry burning that would produce harmful substances
Solution Approach 2:
The system dynamically adjusts heating power based on real-time conditions. By continuously calculating effective output power and comparing it with normal ranges, the system adapts the heating intensity to match actual liquid content status, preventing both overheating and dry burning that would generate harmful substances
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
Prevents dry burning and harmful substance production by ensuring consistent liquid flow and temperature control, enhancing user safety and experience by providing prompts for low liquid content.
Implementation Method 1
an atomization unit configured to heat liquid in the electronic atomization device to atomize the liquid
Implementation Method 2
a sampling circuit configured to acquire a heating resistance of the atomization unit
Data Source
Figure 1
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Figure 4
AI summary
An electronic atomization device is disclosed, including: an atomization unit, configured to heat liquid in the electronic atomization device to atomize the liquid; and a control unit, configured to: send a PWM control signal to the atomization unit, and the PWM control signal is configured to control the atomization unit to heat at a constant temperature kept to the target temperature; calculate the effective output power of the atomization unit; determine whether the oil content of the atomization unit is abnormal according to the effective output power; and control the atomization unit to output the reduced power or stop heating, when it is determined that the oil content of the atomization unit is abnormal.