Aerosol Article Detection With Grounded PCB Noise Shielding
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Solution Overview
Problem
Aerosol generating devices struggle to accurately detect the insertion of an aerosol generating article due to noise interference from internal and external sources, leading to power wastage and delayed smoking times.
Innovation Solution
The device incorporates a sensor with a printed circuit board surrounding the accommodation space, featuring an electrode and ground connection to shield noise, improving detection accuracy by grounding the electrode to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a sensor is used to detect whether an aerosol generating article is inserted, then the detection capability is improved, but the measurement accuracy deteriorates due to noise interference
Solution Approach 1:
A shielding structure is introduced as an intermediary element between the sensor and the noisy environment. This shielding structure acts as a mediator that blocks external noise from reaching the sensor, thereby protecting the sensor's measurement accuracy while preserving its detection capability. The shielding structure is electrically connected to ground to effectively dissipate interference signals.
2Speed
If the heater operates continuously to ensure readiness, then the response time is improved, but power consumption increases
Solution Approach 1:
The heater's operation mode is changed from static (continuous operation) to dynamic (adaptive operation). The heater operates at high power when an aerosol generating article is detected to ensure rapid heating and response. When no article is present, the heater remains off or operates at minimal power, thus adapting its operation to actual needs and reducing unnecessary power consumption.
Solution Approach 2:
A feedback mechanism is implemented where the sensor continuously monitors the presence of an aerosol generating article and provides information to the control unit. Based on this feedback, the control unit adjusts the heater's operation accordingly - activating the heater only when needed, thereby optimizing the balance between response time and power consumption.
3Loss of time
If the heater is activated immediately upon article insertion, then the smoking time is reduced, but unnecessary power is wasted when no article is present
Solution Approach 1:
The sensor performs preliminary detection to confirm the presence of an aerosol generating article before activating the heater. This preliminary action prevents unnecessary heater activation when no article is present, thereby avoiding energy waste while ensuring that the heater is ready to operate immediately once an article is confirmed, thus minimizing smoking time.
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 shields noise, enabling precise detection of aerosol generating article insertion and operation, thus optimizing power usage and smoking experience.
Implementation Method 1
an electrode disposed on one region of the printed circuit board and configured to generate the sensing signal corresponding to a change in capacitance of the accommodation space
Implementation Method 2
ground disposed in another region of the printed circuit board located in a direction opposite to the one region, the electrode being electrically connected to the ground to shield noise
Data Source
AI summary
An aerosol generating device includes a housing including an accommodation space for receiving an aerosol generating article, a heater configured to heat the aerosol generating article inserted into the accommodation space to generate an aerosol, a sensor configured to generate a sensing signal corresponding to a change in capacitance of the accommodation space, and a processor electrically connected to the heater and the sensor, wherein the sensor includes a printed circuit board disposed to surround at least a part of an outer circumferential surface of the accommodation space, an electrode disposed on one region of the printed circuit board and configured to generate the sensing signal corresponding to the change in capacitance of the accommodation space, and ground disposed in another region of the printed circuit board located in a direction opposite to the one region, and the electrode being electrically connected to the ground to shield noise.