Voltage Multiplier Ladder Adaptive Control for Downhole Tools
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Solution Overview
Problem
The modified Cockcroft-Walton voltage multiplier ladder in downhole tools experiences suboptimal operation due to variations in temperature and pressure, leading to uneven voltage distribution and potential component overstress, as its electrical characteristics change during use in well-logging applications.
Innovation Solution
A system with a voltage multiplier ladder and a controller that adjusts the input voltage frequency and magnitude based on measured values from intermediate stages to maintain optimal voltage efficiency and reduce stress on components, using loading coils and adaptive control to compensate for capacitance and parasitic capacitance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage multiplier ladder is operated at a constant frequency, then the operation is simple and stable, but the voltage distribution becomes uneven and component stress increases when temperature and pressure vary
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors the voltage multiplier ladder operation and adjusts the input frequency based on detected conditions. When temperature or pressure variations cause component characteristic changes, the controller modifies the operating frequency to maintain optimal voltage distribution across stages, preventing component overstress and ensuring reliable operation.
Solution Approach 2:
The patent transitions from a static fixed-frequency operation to a dynamic adaptive frequency control system. The operating frequency is no longer constant but dynamically adjusted in response to changing environmental conditions (temperature and pressure), allowing the voltage multiplier ladder to maintain optimal performance across varying downhole conditions.
2Reliability
If the input frequency is adjusted to optimize voltage efficiency, then component stress is reduced, but the control complexity increases
Solution Approach 1:
The controller uses feedback from voltage and current measurements to determine the optimal operating frequency that minimizes component stress. By continuously monitoring the voltage multiplier ladder's electrical characteristics and adjusting the input frequency accordingly, the system maintains reliable operation while preventing component overstress, with the complexity managed through automated control algorithms.
3Adaptability or versatility
If the voltage multiplier ladder components are designed for high temperature and pressure, then the downhole tool can operate in harsh environments, but the component characteristics still vary leading to suboptimal operation
Solution Approach 1:
The patent implements dynamic frequency adjustment that adapts to environmental changes. Even though the voltage multiplier ladder components are designed to withstand high temperature and pressure, their electrical characteristics still vary. The controller dynamically modifies the operating frequency to compensate for these variations, maintaining optimal voltage multiplication efficiency across different downhole conditions.
Solution Approach 2:
The patent changes the operating frequency parameter in response to environmental conditions. By adjusting this key operational parameter, the system compensates for changes in component characteristics caused by temperature and pressure variations, maintaining optimal voltage multiplication efficiency without requiring physical changes to the hardware design.
Data Source
AI summary
A system comprises a voltage multiplier ladder, a driver that provides an input voltage to the voltage multiplier ladder, and a controller that regulates the driver such that a voltage stress in the ladder is evenly distributed and do not exceed a maximum allowable stress and meanwhile the ladder is operating at an optimal efficiency.