Aerosol Heater Control with High-Frequency Sampling
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Solution Overview
Problem
Aerosol generating devices experience noise generation due to the introduction of low-frequency switch signals during the detection of electrical parameters, which degrades user experience.
Innovation Solution
Implementing a high-frequency pulse signal to control the heating operation of the heating element, accompanied by an interrupt request to accurately sample electrical parameters, thereby preventing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low-frequency switch signal is used to control turning on or off of switches for detecting electrical parameters, then the detection circuit can be turned on and off, but low-frequency switch signals are easily introduced into the circuit, causing noise and reducing user experience
Solution Approach 1:
The patent applies periodic action by using a high-frequency pulse signal to drive the switch transistor, which periodically switches between on and off states. This high-frequency periodic switching prevents low-frequency noise introduction while enabling accurate electrical parameter sampling through the ADC, thereby resolving the contradiction between measurement precision and noise reduction
Solution Approach 2:
The patent changes the frequency parameter of the switch signal from low-frequency to high-frequency. By increasing the switching frequency, the system avoids introducing low-frequency noise into the circuit while maintaining the ability to accurately detect electrical parameters, thus resolving the contradiction between precise measurement and noise elimination
2Object-affected harmful factors
If a high-frequency pulse signal is used to control heating operation and sample electrical parameters via interrupt request, then accurate sampling is achieved without noise interference, but the system complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism - the interrupt request system - that mediates between the high-frequency pulse signal and the ADC sampling process. The interrupt request allows the system to accurately sample electrical parameters at appropriate moments without requiring complex continuous control logic, thereby reducing overall system complexity while eliminating noise interference
Solution Approach 2:
The system uses self-service by having the controller automatically generate interrupt requests based on the high-frequency pulse signal timing. This self-triggered sampling mechanism eliminates the need for external complex control circuits, achieving noise-free sampling while maintaining relatively simple system architecture
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
Accurate sampling of electrical parameters is achieved without noise interference, enhancing user experience by improving the operational reliability of the aerosol generating device.
Implementation Method 1
a heating element, electrically connected to the battery core to form a heating circuit, where the heating element is configured to heat an aerosol forming substrate to generate an aerosol
Data Source
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AI summary
An aerosol generating device and a control method therefor are provided, including: a battery core (20); a heating element (10), electrically connected to the battery core (20) to form a heating circuit; a sampling resistor (R1), electrically connected to the battery core (20) and the heating element (10) to form a sampling circuit; a switch transistor (Q1), configured to turn on or turn off the heating circuit and/or the sampling circuit; an analog-to-digital converter (ADC), configured to sample an electrical parameter of the sampling circuit; and a controller (31), configured to externally output a pulse signal for driving the switch transistor (Q1), to control a heating operation of the heating element (10), and further configured to generate an interrupt request and respond to the interrupt request to obtain the electrical parameter sampled by the ADC. The electrical parameter is accurately and effectively sampled through a high-frequency switch signal, to avoid a problem of the aerosol generating device generating noise as a result of a low-frequency switch signal being introduced into a circuit, thereby improving user experience.