Microwave Source Impedance Matching via Frequency and Power Feedback
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Solution Overview
Problem
Conventional solid-state microwave sources have a fixed frequency and power, which cannot be dynamically adjusted in real time to match changing load impedance, leading to impedance mismatch and potential damage due to increased reflected power.
Innovation Solution
An impedance matching apparatus and method that includes a detection module and a control module with a frequency control unit and a power determining unit to adjust the frequency and power of the solid-state microwave source based on load impedance, using feedback from the detection module to control the driver module and adjust the incident power and frequency accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid-state microwave source operates at fixed frequency and power, then the device structure is simple, but the load impedance matching is poor leading to increased reflected power
Solution Approach 1:
The patent implements dynamic frequency and power adjustment capabilities in the solid-state microwave source. The system transitions from fixed operating parameters to dynamically adjustable ones, allowing real-time adaptation to changing load impedance conditions through automated control mechanisms.
Solution Approach 2:
The patent employs a feedback control mechanism where the system continuously monitors reflected power and load impedance conditions, then automatically adjusts frequency and power settings accordingly. This closed-loop control enables the microwave source to maintain optimal matching by using detection results to guide subsequent operational adjustments.
2Adaptability or versatility
If the frequency and power are dynamically adjusted in real time, then the load impedance matching is improved, but the device complexity increases
Solution Approach 1:
The patent implements a self-service control mechanism where the solid-state microwave source automatically monitors its own operating conditions and performs self-adjustment of frequency and power parameters. The system uses built-in detection and control circuits to autonomously maintain optimal impedance matching without requiring external intervention or complex external control systems.
3Power
If the incident power is increased to improve output, then the reflected power increases causing potential damage, but reducing incident power limits output performance
Solution Approach 1:
The patent implements a gradual power increase strategy where the incident power is raised in incremental steps rather than directly to maximum levels. This partial action approach allows the system to monitor reflected power at each stage and stop increasing power when matching conditions deteriorate, thereby avoiding excessive power that would cause damage while still achieving adequate output performance.
Solution Approach 2:
The patent applies preliminary protective measures by continuously monitoring reflected power levels and establishing pre-set thresholds for safe operation. Before reflected power can reach damaging levels, the system detects the trend and takes corrective action by reducing incident power or adjusting frequency, thereby preventing the harmful effect from occurring in the first place.
Data Source
AI summary
Disclosed are an impedance matching apparatus and method for a solid-state microwave source. The impedance matching apparatus is connected to a solid-state microwave source and includes a detection module and a control module. The control module includes a frequency control unit and a power determining unit. The frequency control unit is configured to adjust a current frequency of a phase-locked source of the solid-state microwave source according to a received frequency modulation (FM) instruction. The power determining unit is configured to perform following steps: controlling a driver module of the solid-state microwave source to gradually increase a total incident power, and determining a change trend of a total reflected power of the solid-state microwave source; controlling the driver module to reduce the incident power; setting the FM instruction, and sending the set FM instruction to the frequency control unit.