Self-Biasing Active Load Circuit for High Voltage Power Supplies
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Solution Overview
Problem
Conventional high voltage power supplies for charged particle beam processing systems experience excessive power dissipation due to resistor loads, which becomes impractical at high voltages, especially when biasing optical elements in gas cluster ion beam systems.
Innovation Solution
A self-biasing active load circuit is integrated into the high voltage power supply to maintain a variable voltage drop while sustaining a substantially constant current, reducing power dissipation and improving efficiency across a range of operating voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a resistor load is used to shunt excess current in a high voltage power supply, then the voltage can be maintained across the optical element, but the power dissipation becomes excessive at high voltages
Solution Approach 1:
The patent changes the electrical parameters of the load circuit by replacing a fixed resistor with an active load circuit that can dynamically adjust its resistance. The operational amplifier-based circuit maintains a constant current through the optical element while absorbing excess voltage, thereby reducing power dissipation compared to a fixed resistor that would dissipate P=V²/R power at high voltages.
Solution Approach 2:
The patent substitutes a passive resistive load with an active electronic control system using operational amplifiers and transistors. This active load circuit intelligently regulates the current and voltage, replacing the simple passive resistor mechanism with a controlled electronic system that minimizes energy waste.
2Adaptability or versatility
If the desired voltage is varied across a range of operating voltages, then the system can adapt to different processing requirements, but the power dissipation in the resistor load becomes impractically high
Solution Approach 1:
The patent implements a dynamic load circuit using operational amplifiers and active components that can continuously adjust their operating parameters. The circuit responds in real-time to changes in desired voltage, maintaining optimal current flow while absorbing variable voltage drops, thereby enabling wide voltage range adaptability without the quadratic power dissipation penalty of a fixed resistor.
Solution Approach 2:
The active load circuit incorporates feedback mechanisms through operational amplifiers that monitor the voltage and current conditions. This feedback allows the circuit to self-regulate and maintain constant current through the optical element while adapting to different voltage requirements, preventing excessive power dissipation across the variable voltage range.
Data Source
AI summary
A load circuit device having a self-biasing active load circuit, and a related high voltage power supply configured to bias an optical element in a charged particle beam processing system, such as a gas cluster ion beam (GCIB) processing system. The high voltage power supply comprises a variable voltage supply having a load terminal at a load potential and a reference terminal at a reference potential, and a self-biasing active load circuit connected between the load terminal and the reference terminal, and configured to sustain a variable voltage drop between the load potential and the reference potential while maintaining a substantially constant current.