Induction Vapor Heating Circuit for Accurate Susceptor Temperature Sensing
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Solution Overview
Problem
Existing heat-not-burn cigarette devices face inaccuracies in real-time temperature sampling due to high-power output causing voltage ripple and signal noise, leading to interrupted heating and temperature overshoot.
Innovation Solution
A vapor generation device incorporating a DC-DC booster, voltage regulator module, and operational amplifier to stabilize and boost the power supply for the sampling module, allowing real-time accurate temperature sensing during oscillation, and using a thermocouple for precise temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the induction coil generates an alternating magnetic field to induce heating of the susceptor, then heating power is sufficient, but the power supply voltage drops and produces large ripple and signal noise that affects temperature sampling accuracy
Solution Approach 1:
The patent divides the power supply system into two independent channels: a first power supply channel for the temperature sensor and a second power supply channel for the induction coil and control circuit. This segmentation isolates the high-power heating circuit from the low-power sensing circuit, preventing the voltage ripple and current noise from the heating channel from interfering with the temperature sampling in the sensing channel, thereby resolving the contradiction between sufficient heating power and accurate temperature measurement.
2Loss of time
If the temperature sampling is performed during oscillation of the LC oscillator, then real-time temperature monitoring is achieved, but the large load state causes voltage drop and sampling inaccuracy
Solution Approach 1:
The patent implements temporal segmentation by controlling the sampling operation to execute only during the off-period of the switch tube, when the induction coil is not generating the alternating magnetic field. During this interval, the power supply voltage is stable without large ripple, enabling accurate temperature sampling. This approach achieves real-time monitoring while avoiding the voltage drop and noise issues present during high-power oscillation.
3Measurement precision
If the heating is interrupted to perform temperature sampling, then sampling accuracy is improved, but the heating progress is affected and temperature overshoot occurs
Solution Approach 1:
The patent employs preliminary action by performing temperature sampling during the off-period of the switch tube, which is a predetermined time window that occurs naturally in the switching cycle. This allows the system to prepare and execute sampling at optimal moments without interrupting the overall heating process. The heating continues uninterrupted through continuous on-off cycling, while sampling is preliminarily scheduled to occur during the off-intervals, thus maintaining both high sampling accuracy and heating productivity.
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 enables real-time, accurate temperature sensing and stable heating by reducing ripple interference, preventing temperature overshoot and ensuring consistent aerosol generation for inhalation.
Implementation Method 1
a susceptor, configured to generate heat upon penetration by a changing magnetic field, to heat the aerosol generation product
Implementation Method 2
a DC-DC booster, having an input terminal connected to the core and an output terminal connected to the sampling module, where the DC-DC booster is configured to boost an output voltage of the core and output the boosted voltage to the sampling module to supply power to the sampling module
Implementation Method 3
an LC oscillator, including an inductance coil and a first capacitor; a first switch tube, positioned between the core and the LC oscillator, where the first switch tube is configured to be intermittently turned on to drive the LC oscillator to oscillate, thereby directing a changing current to flow through the inductance coil to generate a changing magnetic field in the inductance coil
Implementation Method 4
a temperature sensor, configured to sense a temperature of the susceptor
Data Source
AI summary
A vapor generation device, includes a core to supply power; a susceptor to generate heat upon penetration by a changing magnetic field, to heat the aerosol generation product an LC oscillator, including an inductance coil and a first capacitor; a first switch tube, positioned between the core and the LC oscillator, where the first switch tube is configured to be intermittently turned on to drive the LC oscillator to oscillate; a temperature sensor to sense a temperature of the susceptor; a sampling module to sample a sensing result of the temperature sensor; and a DC-DC booster, having an input terminal connected to the core and an output terminal connected to the sampling module, where the DC-DC booster is to boost an output voltage of the core and output the boosted voltage to the sampling module to supply power to the sampling module when the first switch tube is turned on.