Power Converter Switching Control Beyond Controller Cycle Limits
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Solution Overview
Problem
The challenge of accurately controlling switching elements in power conversion systems is exacerbated by the use of high-speed switching cycles, which outpace the operation time of the controller, leading to inefficiencies and inaccurate control.
Innovation Solution
A power conversion system and method that drives switching elements in one control cycle and adjusts their operation based on detected output currents, with longer initial switching cycles and subsequent cycles based on previous cycle results, allowing for accurate control in high-speed switching environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed switching cycles are used to increase power conversion efficiency, then switching speed is improved, but control accuracy deteriorates because the switching cycle becomes faster than the controller operation time
Solution Approach 1:
The patent segments the control cycle into multiple sub-cycles, where each sub-cycle controls a specific switching element. This allows the controller to process control signals for multiple switching elements sequentially within one overall control cycle, enabling accurate control even when individual switching cycles are faster than the controller operation time.
Solution Approach 2:
The patent performs preliminary computation of control signals during the control cycle, storing them in advance before the actual switching occurs. This preliminary action allows the controller to prepare control signals for high-speed switching elements without requiring real-time computation during the switching event, thereby maintaining both high switching speed and control accuracy.
2Measurement precision
If the controller operation time is extended to improve control accuracy, then control accuracy is improved, but the switching cycle must be slowed down, reducing power conversion efficiency
Solution Approach 1:
By dividing the control of multiple switching elements into separate sub-cycles, the system achieves accurate control within a shorter overall control cycle, maintaining high power conversion efficiency while ensuring control accuracy for each individual switching element.
Solution Approach 2:
The patent implements periodic sub-cycles within the overall control cycle, where each sub-cycle handles specific switching elements at optimized intervals. This periodic structure allows the system to maintain high switching frequencies for power conversion efficiency while ensuring each switching element receives accurate periodic control signals.
3Measurement precision
If multiple switching elements are controlled in separate cycles to improve control accuracy, then control accuracy is improved, but the overall control cycle time increases, reducing productivity
Solution Approach 1:
The control cycle is segmented into multiple sub-cycles, each handling specific switching elements. This segmentation allows parallel processing of control signals for different switching elements within the overall control cycle, achieving accurate control without extending the total control cycle time, thus maintaining high power conversion efficiency.
Solution Approach 2:
The patent ensures continuous useful action by overlapping sub-cycles and control operations, where the controller continuously generates and updates control signals for different switching elements throughout the control cycle. This continuous operation eliminates idle time and maintains high productivity while ensuring accurate control for each switching element.
Data Source
AI summary
A power conversion system may include: a power conversion module including a plurality of switching elements, the power conversion module configured to perform a power conversion operation through the plurality of switching elements; and a controller configured to: perform a first operation of the power conversion operation to drive the plurality of switching elements in a first control cycle, the first control cycle including a first plurality of switching cycles, and based on a result of the first operation, after the first control cycle, drive the plurality of switching elements in a second control cycle, the second control cycle including a second plurality of switching cycles.