Sensor FPC Layout Near a Heating Unit to Cut Heat Dissipation
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Solution Overview
Problem
Aerosol-generating devices face a drop in energy efficiency due to heat dissipation from printed wiring on flexible printed circuit boards near the heating unit, which are made of materials with high thermal conductivity like copper and gold.
Innovation Solution
A power supply unit and aerosol-generating device design with a flexible printed wiring board featuring a first region close to the heating unit and a second region further away, with lower wiring density in the first region compared to the second, to minimize heat dissipation and maintain energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If printed wiring is formed on a flexible printed circuit board near the heating unit, then the device can be compact and integrated, but heat dissipation increases and energy efficiency decreases
Solution Approach 1:
The flexible printed circuit board is designed with spatially varying wiring density: the first region near the heating unit has lower wiring density to reduce heat dissipation, while the second region farther away has higher wiring density to ensure adequate electrical connectivity. This local differentiation resolves the contradiction by allowing integration without uniform wiring density throughout the board.
2Reliability
If printed wiring with high thermal conductivity materials is used, then electrical conductivity is improved, but heat dissipation from the heating unit increases
Solution Approach 1:
The flexible printed circuit board implements different wiring densities in different regions: the first region close to the heating unit has lower wiring density to minimize heat dissipation, while the second region farther away has higher wiring density to ensure adequate electrical conductivity. This spatial differentiation allows the use of high thermal conductivity materials without uniform heat dissipation throughout the board.
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 configuration enhances energy efficiency by reducing heat loss from the heating unit, thereby maintaining high energy performance in aerosol-generating devices.
Implementation Method 1
the printed wiring may dissipate the heat generated by the heating unit, leading to a drop in energy efficiency
Data Source
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AI summary
A power supply unit (110) of an inhalation device (100) comprises: a power source unit (111C) capable of supplying power to a heating unit (121C) for heating at least one of a stick-type substrate (150) and a flavor source (131); and a sensor FPC (73) on which are mounted a stick detection sensor (12), an inhalation sensor (13), a case temperature sensor (14), signal wiring (733), and ground wiring (734). The sensor FPC (73) has a first region (A1) close to the heating unit (121C), and a second region (A2) which is further from the heating unit (121C) than the first region (A1). A wiring density in the first region (A1) of the sensor FPC (73) is lower than a wiring density in the second region (A2).