Quadrature Modulation for Uniform Microwave Heating
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Solution Overview
Problem
Conventional high-frequency heating devices face limitations in forming multiple microwave distributions simultaneously without increasing the number of oscillators and antennas, leading to uneven heating, especially in objects with slow thermal diffusion rates like foodstuffs, and require larger device sizes to accommodate more distributions.
Innovation Solution
A high-frequency heating device configuration that includes a high-frequency power generating part, a quadrature modulation part, a power amplification part, a radiation part, a modulation signal generating part, and a control part, which uses quadrature modulation and subcarrier waves to generate multiple frequencies and phases from a single radiation part, allowing for simultaneous formation of multiple microwave distributions without increasing the number of oscillators or antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple oscillators and antennas are used to form multiple microwave distributions simultaneously, then heating uniformity is improved, but device size increases
Solution Approach 1:
The patent applies parameter changes by modulating the frequency and phase of microwave signals through quadrature modulation. Instead of using multiple independent oscillators and antennas, the invention varies the frequency and phase parameters of a single microwave source to create multiple microwave distributions simultaneously, thereby achieving uniform heating without increasing device size
Solution Approach 2:
The patent implements multi-functionality by enabling a single radiation part to generate multiple microwave distributions through frequency and phase modulation. The quadrature modulation part allows one oscillator and one antenna to perform the function of multiple oscillators and antennas by radiating microwaves at different frequencies and phases simultaneously
2Productivity
If the number of oscillators and antennas is increased to form more microwave distributions, then heating efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple microwave generation functions into a single system. By combining frequency modulation and phase modulation capabilities in one oscillator and using quadrature modulation to combine multiple signal paths, the invention achieves multiple microwave distributions from a single radiation part, reducing device complexity while maintaining heating efficiency
Solution Approach 2:
The quadrature modulation part enables a single microwave source to perform multiple functions by generating signals at different frequencies and phases. This multi-functional approach allows one oscillator and antenna system to replace what would traditionally require multiple independent systems
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 uniform heating and various types of heating control with a compact and cost-effective design by generating multiple microwave distributions from a single radiation part, improving heating efficiency and reducing device size.
Implementation Method 1
a quadrature modulation part modulating a high-frequency power generated by the high-frequency power generating part with an in-phase modulation signal and a quadrature modulation signal
Implementation Method 2
a high-frequency heating device dielectrically heating an object to be heated housed in a heating chamber
Data Source
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AI summary
A high-frequency heating device of the present invention includes at least one high-frequency power generating part 120, at least one high-frequency power unit 130 including a quadrature modulation part 131 and a high-frequency power amplification part 132, a radiation part 140, a modulation signal generating part 150, and a control part 110, and the control part 110 supplies the modulation signal generating part 150 with a plurality of pieces of subcarrier information respectively including pieces of information of offset frequencies and phases, generates an in-phase modulation signal and a quadrature modulation signal, performs quadrature modulation in the quadrature modulation part 131, and outputs a plurality of subcarrier waves.