Inverter Frequency Control for ICP Power Phase Compensation
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Solution Overview
Problem
Existing power supply systems for inductively coupled plasma (ICP) devices face challenges in efficiently supplying power without increasing complexity, causing high-frequency switching noise, or applying stress, which degrades reliability and reduces the lifespan of the power supply.
Innovation Solution
A power supply system that includes an inverter to convert DC power to AC power, an impedance matching circuit to supply the AC power to a load, and a controller that detects the delay time between output voltage and output current and adjusts the frequency of the output voltage accordingly to compensate for phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional power supply control methods are used to control power amount or current amount supplied to ICP device, then power control capability is improved, but device complexity increases
Solution Approach 1:
The patent changes the operating frequency parameter of the inverter to control the power amount supplied to the ICP device. By adjusting the frequency instead of using complex control circuits, the system achieves effective power control while maintaining simplicity in the power supply design.
2Measurement precision
If high-frequency switching is used to control power supply, then power control precision is improved, but high-frequency switching noise is generated
Solution Approach 1:
The patent uses frequency modulation within a specific range (20 kHz to 100 kHz) to achieve precise power control while avoiding the high-frequency switching noise problem. By operating in this optimized frequency range, the system maintains control precision without generating excessive electromagnetic interference.
3Power
If conventional power supply methods are used, then power supply capability is maintained, but stress is applied to power supply causing malfunction
Solution Approach 1:
The patent detects the delay time between output voltage and current beforehand and uses this information to adjust the operating frequency proactively. This prevents excessive stress from occurring in the first place, thereby protecting the power supply components from malfunction and improving overall reliability.
4Productivity
If phase difference compensation is not performed, then system simplicity is maintained, but power supply efficiency is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the delay time between output voltage and current is continuously detected and used to adjust the operating frequency. This feedback loop automatically compensates for phase differences, improving power supply efficiency without requiring complex external control 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
The system improves reliability by automatically compensating for phase differences between output voltage and current, reducing the risk of noise and stress, and maintaining efficiency without increasing complexity.
Implementation Method 1
an inverter configured to convert direct current (DC) power into alternating current (AC) power
Data Source
AI summary
A power supply includes an inverter configured to convert direct current (DC) power into alternating current (AC) power, an impedance matching circuit configured to supply the AC power to a load, and a controller configured to detect a delay time of an output voltage and an output current output to the impedance matching circuit and the load and to adjust a frequency of the output voltage according to the detected delay time.