LC Oscillator PWM Control for Stable Aerosol Susceptor Heating
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Solution Overview
Problem
Conventional electronic atomization devices experience overheating and inconsistent aerosol taste due to a fixed resonance frequency and duty cycle in LC oscillation circuits, leading to unstable temperature control of the susceptor.
Innovation Solution
Implementing an intermittent pulse width modulation (PWM) signal to control the LC oscillator, adjusting pulse density and energy delivery to the susceptor, ensuring a consistent temperature profile during inhalation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed resonance frequency and duty cycle are used in the LC oscillation circuit, then the device structure is simple and easy to control, but the susceptor temperature continuously rises causing overheating and affecting aerosol taste
Solution Approach 1:
The patent applies dynamics by making the resonance frequency and duty cycle adjustable rather than fixed. The control module dynamically adjusts the resonance frequency of the LC oscillation circuit and the duty cycle of the PWM signal during the atomization process, allowing the system to adapt to changing thermal conditions and prevent susceptor overheating while maintaining aerosol quality.
2Temperature
If the resonance frequency and duty cycle are adjusted during inhalation, then the susceptor temperature stability is improved, but the control system complexity increases
Solution Approach 1:
The patent implements feedback control where the control module continuously monitors the atomization process and adjusts the resonance frequency and duty cycle accordingly. This feedback mechanism allows the system to maintain optimal susceptor temperature by responding to real-time conditions, preventing overheating while managing control complexity through intelligent algorithms.
3Use of energy by moving object
If a continuous PWM signal with fixed duty cycle is used, then the energy delivery is consistent, but the susceptor overheats and aerosol taste deteriorates
Solution Approach 1:
The patent applies periodic action by using pulsed PWM signals with variable duty cycles instead of continuous fixed-duty-cycle signals. The control module periodically adjusts the duty cycle and resonance frequency during the inhalation duration, delivering energy in controlled pulses that prevent susceptor overheating while maintaining consistent aerosol generation quality.
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
Maintains stable aerosol generation and improved taste by regulating energy delivery to the susceptor, preventing overheating and ensuring uniform aerosol production.
Implementation Method 1
an induction coil is controlled to generate a changing magnetic field, to induce a susceptor to generate heat
Implementation Method 2
the susceptor heats the aerosol generating substrate to generate an aerosol
Data Source
Figure 1
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AI summary
Provided are an electronic atomization apparatus and a control method. The electronic atomization apparatus comprises: a susceptor (30) for heating an aerosol generating substrate to generate an aerosol; an LC oscillator (222) comprising an induction coil (260) and a capacitor, the LC oscillator (222) being configured to guide a changed current to flow through the induction coil (260) and thereby to drive the induction coil (260) to provide energy to the susceptor (30) so that the susceptor (30) heats the aerosol generating substrate; and a controller (221) configured to drive the LC oscillator (222) with an intermittent PWM signal to form a current flowing through the induction coil (260) and control a pulse density of the PWM signal within a predetermined time so that an energy value provided to the susceptor (30) is maintained at a preset energy value. The electronic atomization apparatus controls the pulse density of the PWM signal within a smoking duration of a user, so that the energy value provided to the susceptor (30) is maintained at the preset energy value, thereby maintaining the aerosol generation or smoking taste within the smoking duration stable.