Inductor Current Mapping Controller for Power Inverters
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Solution Overview
Problem
Existing power inverters face challenges in achieving efficient DC-to-AC conversion with high power quality due to the complexity and limitations of digital control methods, which require detailed analysis of topological stages and often compromise on cost, size, weight, and performance.
Innovation Solution
The introduction of an Inductor Current Mapping (ICM) controller, which bypasses detailed digital analysis by directly mapping voltage-current relations in filter inductors to control the inverter output, providing a simple analog solution that does not require current sensors or additional start-up means, and offers robust, high-quality AC outputs for a wide range of power factor loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital control methods are used for power inverters, then control precision can be improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces digital control systems with an analog control circuit that directly processes voltage signals. The controller uses operational amplifiers, resistors, and capacitors to implement control functions without digital processors, ADCs, or complex software, thereby reducing device complexity while maintaining control precision through continuous analog signal processing.
Solution Approach 2:
The patent extracts and eliminates unnecessary components from traditional digital control systems, specifically removing current sensors, microcontrollers, and digital signal processing units. The control function is achieved through a simplified analog circuit that directly maps voltage relationships, reducing both complexity and cost while preserving essential control capabilities.
2Power
If switching frequency is increased to improve power density, then power density is improved, but control difficulty and losses increase
Solution Approach 1:
The patent replaces complex digital control algorithms required for high-frequency switching with a simple analog control circuit. The analog circuit naturally responds to voltage changes without requiring complex computation, enabling effective control at high switching frequencies and thus achieving high power density without proportionally increasing control difficulty.
3Loss of energy
If detailed digital analysis of topological stages is performed, then conversion efficiency can be improved, but controller complexity and cost increase
Solution Approach 1:
The patent replaces complex digital analysis and computation with direct analog voltage mapping. The control circuit uses operational amplifiers and passive components to automatically adjust switching duty cycles based on real-time voltage relationships, achieving efficient power conversion without requiring complex digital processors or extensive computational resources.
Solution Approach 2:
The analog control circuit self-regulates the inverter operation by directly sensing voltage relationships and automatically adjusting switching signals. The circuit inherently compensates for voltage variations and load changes without requiring external intervention or complex control algorithms, achieving efficient conversion through self-service operation.
4Measurement precision
If current sensors and additional start-up means are added, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes current sensors from the system by developing a control method that relies solely on voltage measurements. The analog control circuit uses readily available voltage sensing nodes to infer system state and control switching, eliminating the need for additional current sensing hardware and simplifying the overall controller design.
Data Source
AI summary
Methods and corresponding apparatus for regulation, control, and management of DC-to-AC, AC-to-DC, and/or DC-to-DC switching power conversion.