Induction Heating Circuit for Low-Frequency Aerosol Generation
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Solution Overview
Problem
Existing aerosol generation devices for heat-not-burn tobacco products lack efficiency and effectiveness in generating aerosols, particularly in terms of resonant frequency and power consumption, as they rely on conventional LC oscillators which are not optimized for low resonant frequency and high efficiency.
Innovation Solution
The aerosol generation device employs an LCC oscillator with a specific configuration of inductance coil, capacitors, and switch tubes to generate a variable magnetic field, using a zero current switch inverter topology and alternate switching of switch tubes to optimize alternating current flow through the coil, thereby heating the aerosol generation product efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an LC oscillator is used to generate alternating current for heating, then the device can heat the aerosol generation product, but the resonant frequency is high and efficiency is low
Solution Approach 1:
The patent changes the circuit configuration from a conventional LC oscillator to an LCC oscillator by adding a second capacitor in series with the inductance coil. This parameter change in the circuit topology transforms the resonant frequency characteristics, achieving lower resonant frequency and improved heating efficiency for aerosol generation.
2Productivity
If an LCC oscillator is used instead of LC oscillator, then resonant frequency is lower and efficiency is higher, but device complexity increases
Solution Approach 1:
The LCC oscillator circuit is segmented into distinct functional modules: the first capacitor connected to the positive electrode, the second capacitor connected to the negative electrode, and the inductance coil forming the resonant circuit. This segmentation allows for independent optimization of each component while maintaining the overall low-frequency high-efficiency performance.
3Use of energy by moving object
If switch tubes are switched at different times with zero current switch topology, then power consumption is reduced, but control complexity increases
Solution Approach 1:
The control system monitors the current state of the LCC oscillator and implements zero-current switching by detecting when the current through the inductance coil reaches zero before actuating the switch tubes. This feedback mechanism ensures optimal switching timing that minimizes power loss while maintaining reliable control through overcurrent monitoring and protection.
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 LCC oscillator configuration achieves a lower resonant frequency and higher efficiency compared to conventional LC oscillators, enabling effective aerosol generation with reduced power consumption and improved safety features like overcurrent monitoring.
Implementation Method 1
an alternating current is formed by connecting an induction coil and a capacitor in series or in parallel to form LC oscillation, so that the coil generates an alternating magnetic field to induce a susceptor to generate heat
Implementation Method 2
a susceptor, configured to be penetrated by the variable magnetic field to generate heat, to heat the aerosol generation product received in the chamber
Data Source
AI summary
An aerosol generation device includes: a chamber to receive an aerosol generation product; a cell, including a first electrode and a second electrode; a first switch tube and a second switch tube; an LCC oscillator, including an inductance coil, a first capacitor, and a second capacitor; a first end of the inductance coil is connected to the second end of the first capacitor, and a second end of the inductance coil is connected to the first electrode through the first switch tube and is connected to the second electrode through the second switch tube; and the first switch tube and the second switch tube are turned on and turned off alternately, to guide an alternating current to flow through the inductance coil to generate a variable magnetic field; and a susceptor, configured to be penetrated by the variable magnetic field to generate heat, to heat the aerosol generation product.