Snubber-Coupled Buck Converter for Low-Frequency Ripple Reduction
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Solution Overview
Problem
Magnetron sputtering systems experience significant voltage and current ripple at lower frequencies due to the buck converter's coupling with the high-input line and input inductor, making it difficult to consistently regulate the output of the DC power supply.
Innovation Solution
The buck converter is coupled within the snubber circuit instead of being connected to a node preceding the input inductor, reducing ripple by isolating it from the high-input line and DC power supply, and utilizing a snubber circuit with rectifying and capacitive components to manage the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the buck converter is connected to a node on the high-input line between the DC power supply and input inductor, then the system can operate at lower frequencies, but significant voltage and current ripple occurs making output regulation difficult
Solution Approach 1:
The patent extracts the buck converter from its conventional connection point on the high-input line and relocates it within the snubber circuit. This separation removes the source of ripple generation from the main power path, allowing the system to operate at lower frequencies without compromising output regulation stability.
Solution Approach 2:
The snubber circuit serves as an intermediary structure that hosts the buck converter. By placing the buck converter within the snubber, the design uses the snubber's inherent capacitive and inductive elements to isolate ripple from the main power path while maintaining the required electrical functions.
2Adaptability or versatility
If the buck converter operates at lower frequencies to match plasma processing requirements, then the plasma load can be properly driven, but voltage ripple on the high-input line and current ripple in the input inductor increase significantly
Solution Approach 1:
The patent converts the harmful ripple effect into a beneficial isolation mechanism. By placing the buck converter within the snubber circuit, the ripple that would normally disturb the main power path is instead contained within the snubber's reactive elements, where it can be managed without affecting the plasma load compatibility.
3Reliability
If the buck converter is isolated within the snubber circuit, then voltage and current ripple are reduced improving output stability, but the circuit topology becomes more complex
Solution Approach 1:
The patent merges the buck converter with the snubber circuit functions. By integrating the voltage conversion function into the existing snubber structure, the design achieves ripple reduction and improved output stability without adding completely separate components, thereby limiting the increase in circuit topology 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
This configuration effectively reduces voltage and current ripple, enhancing the stability and consistency of the DC power supply output, particularly at lower frequencies, by isolating the buck converter within the snubber and utilizing capacitive components to manage energy storage and release.
Implementation Method 1
a capacitive component, and a node between the rectifying component and the capacitive component
Implementation Method 2
a switching circuit to convert the DC from the inverter to a pulsed DC output waveform provided to the plasma load
Data Source
AI summary
This disclosure describes systems, methods, and apparatus for reducing ripple in a pulsed waveform power generation system, often for use providing power to a plasma processing chamber. A snubber can be provided between a DC power supply and a switching circuit. A buck converter can also be provided between the snubber and the switching circuit, where the buck converter takes its input from within the snubber and in particular from between a rectifying and capacitive component of the snubber. In this way, the buck converter can be isolated from the DC power supply via an input inductor on a high-input line from the DC power supply.