Variable-Polarity HV Power Conversion for Charge Balance
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Solution Overview
Problem
Current power processing systems for ion sources and ion thrusters face challenges in providing variable polarity power, managing charge imbalances, and efficiently operating in high-voltage environments, leading to component wear and increased system weight and complexity.
Innovation Solution
A variable polarity controllable power supply system that includes a drive assembly, output assembly, polarity selector, controller, and feedback isolator, capable of converting low voltage DC input to high voltage DC output with switchable polarity, mitigating charge imbalances, and optimizing power distribution for ion sources and thrusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable polarity power conversion is implemented using conventional systems, then power conversion capability is achieved, but system weight and complexity increase
Solution Approach 1:
The patent combines the polarity selection function with the existing power conversion circuitry by utilizing the switching elements (MOSFETs Q1-Q4) and diodes (D1-D4) already present in the full-bridge converter topology. The polarity selector circuit merges with the rectifier circuit to share common components, eliminating the need for separate polarity switching mechanisms and reducing overall system complexity and weight.
Solution Approach 2:
The switching elements and diodes in the power conversion circuit serve dual functions: both power conversion and polarity selection. The same MOSFETs and diodes that perform rectification also enable polarity switching when controlled by the controller, making the system multi-functional without adding dedicated components for each function.
2Productivity
If high-voltage power conversion is performed continuously in one polarity, then power output is maintained, but component wear increases
Solution Approach 1:
The controller periodically switches the output polarity between positive and negative cycles, creating an alternating polarity operation mode. This periodic polarity reversal prevents charge accumulation on capacitive components and distributes wear evenly across switching elements by alternating the stress directions, thereby extending component life while maintaining continuous power output.
Solution Approach 2:
The feedback isolator circuit monitors the output voltage and provides feedback to the controller, enabling the system to detect charge imbalances and automatically adjust polarity switching timing. This feedback mechanism ensures optimal polarity reversal intervals that prevent excessive component stress while maintaining stable power output.
3Duration of action of stationary object
If charge imbalances are not managed, then system operation continues, but performance degrades
Solution Approach 1:
The system implements periodic polarity reversal that naturally balances charge accumulation on output capacitors and other reactive components. By alternating the polarity at regular intervals, the system prevents sustained charge imbalances that would otherwise lead to voltage drift and performance degradation, enabling continuous operation without manual intervention.
Solution Approach 2:
The feedback circuit continuously monitors output voltage characteristics and provides signals to the controller to adjust polarity switching timing. When charge imbalance is detected through voltage deviations, the feedback mechanism triggers polarity reversal to restore balance, automatically correcting performance-degrading conditions before they affect system reliability.
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 reduces wear on high-voltage components, minimizes system weight, enables efficient high-voltage operation, and provides balanced power distribution, effectively managing charge imbalances and supporting thrust generation and ion processing tools.
Implementation Method 1
converting a low voltage direct current (DC) input to a low voltage alternating current (AC) output
Implementation Method 2
converting the low voltage AC output to a medium voltage AC output at a step-up transformer
Implementation Method 3
converting the medium voltage AC output to a high voltage direct current (DC) output at a power rectifier
Data Source
AI summary
A polarity-selectable high voltage direct current power supply including a first drive assembly that transforms a first low voltage DC input into a first medium voltage alternating current output; a first HV output assembly that transforms the first LV AC output into a first HV DC output, wherein the first HV output assembly defines a first input stage; a polarity selector coupled between the second output junction of the first drive assembly and the first and second input stages of the first HV output assembly, the polarity selector operable between a first configuration and a second configuration; wherein in the first configuration the first HV DC output has a positive polarity; and wherein in the second configuration the first HV DC output has a negative polarity.