Resonant Temperature Sensing Circuit for Induction Vaporizers
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Solution Overview
Problem
Existing temperature sensing methods in induction heating systems, such as thermocouples and infrared thermometers, face challenges in accurately measuring the temperature of susceptor elements due to size constraints and inability to withstand high temperatures, making it difficult to control the chemical composition of vapors produced in vaporizer devices.
Innovation Solution
A temperature sensor circuit comprising a capacitor and inductor, where the resonant frequency changes based on the susceptor's temperature, is used in thermal contact with the susceptor, allowing for accurate temperature sensing and withstanding high temperatures, and is electromagnetically coupled with the induction element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional temperature sensing methods (thermocouples, infrared thermometers) are used, then the device structure is simple, but the temperature measurement precision deteriorates due to size constraints and inability to withstand high temperatures
Solution Approach 1:
The patent replaces traditional mechanical temperature sensing devices (thermocouples, infrared thermometers) with an electromagnetic-based sensing system. The temperature sensor circuit uses electromagnetic coupling with the induction element to sense temperature through changes in resonant frequency, eliminating the need for direct physical contact or line-of-sight measurement, thereby achieving accurate high-temperature measurement without mechanical contact limitations.
Solution Approach 2:
The patent utilizes changes in the resonant frequency parameter of the temperature sensor circuit as a function of temperature. The circuit is designed so that its resonant frequency shifts predictably with temperature changes, allowing temperature measurement through frequency detection rather than direct thermal measurement, thus enabling accurate sensing in high-temperature environments.
2Measurement precision
If a temperature sensor is placed in direct thermal contact with the susceptor, then the temperature measurement precision improves, but the sensor reliability deteriorates due to inability to withstand high temperatures
Solution Approach 1:
The patent introduces an intermediary electromagnetic field coupling mechanism between the temperature sensor circuit and the susceptor. Instead of direct thermal contact, the sensor circuit couples electromagnetically with the induction element, which in turn is coupled to the susceptor. This intermediary coupling allows temperature sensing without exposing the sensor to direct high-temperature contact, preserving sensor reliability while maintaining measurement accuracy through the coupled electromagnetic system.
3Measurement precision
If the temperature sensor circuit is electromagnetically coupled with the induction element, then the temperature measurement precision improves through resonant frequency detection, but the device complexity increases
Solution Approach 1:
The temperature sensor circuit is designed to perform multiple functions: it serves as both a temperature sensing element and an RFID communication interface. The same inductor-capacitor resonant circuit that detects temperature through frequency shifts also handles wireless communication, eliminating the need for separate communication hardware and reducing overall device complexity despite the advanced sensing mechanism.
Solution Approach 2:
The patent merges the temperature sensing function with the RFID communication function into a single integrated circuit. The inductor and capacitor that form the resonant temperature sensor also serve as the antenna and communication interface for RFID, combining two functional systems into one unified structure, thereby minimizing the increase in device complexity.
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
Enables precise temperature control of the susceptor element, ensuring the chemical composition of vapors produced by the induction heating system remains within a desired range, improving the performance and efficiency of vaporizer devices.
Implementation Method 1
induction heating may include heating the object based on heat generated in the object by eddy currents that flow in the object
Implementation Method 2
Electric currents may be generated inside the electrically conductive object based on the magnetic field. The electric currents may be referred to as eddy currents
Implementation Method 3
The eddy currents may flow through the electrically conductive object and cause heat to be generated in the electrically conductive object based on Joule heating
Implementation Method 4
a temperature sensor circuit in thermal contact with the susceptor element
Implementation Method 5
wherein a resonant frequency of the temperature sensor circuit changes based on a temperature of the susceptor element
Data Source
AI summary
A system for sensing temperature in a vaporizer device is provided, the system including: an induction element; a susceptor element; a cartridge; and a temperature sensor circuit in thermal contact with the susceptor element, the temperature sensor circuit including: a capacitor, and an inductor, in which a resonant frequency of the temperature sensor circuit changes based on a temperature of the susceptor element, in which the induction element is electromagnetically coupled to the temperature sensor circuit, and in which the susceptor element is located within the cartridge and the temperature sensor circuit is located within the cartridge.