Shared Coupled Inductor Buck-Boost Converter Mode Switching
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Solution Overview
Problem
Power converters face challenges in efficiently managing voltage conversion and current flow due to mutual inductance issues between windings of coupled inductors, leading to complexity in control and inefficiencies in power conversion modes.
Innovation Solution
A buck-and-boost power converter design that employs a shared coupled inductor and operates in both Continuous Current Mode (CCM) and Semi-CCM, with control modes transitioning based on measured electrical parameters, allowing for reduced complexity and improved efficiency by restricting reverse current flow and optimizing switch states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a shared coupled inductor is used in buck-and-boost power converter, then the size and cost are reduced, but mutual inductance issues cause complexity in control and inefficiencies in power conversion modes
Solution Approach 1:
The patent applies dynamics by transitioning between two operational modes (CCM and Semi-CCM) based on real-time electrical parameters. The control system dynamically adjusts the operating mode to optimize performance, allowing the converter to adapt to varying load conditions and maintain efficiency while managing the complexity introduced by the shared coupled inductor.
Solution Approach 2:
The patent changes operational parameters by switching between CCM and Semi-CCM modes based on measured electrical parameters such as current and voltage levels. This parameter change approach allows the system to optimize power conversion efficiency and simplify control under different operating conditions, directly addressing the mutual inductance challenges.
2Productivity
If operational modes transition based on measured electrical parameters, then control complexity is reduced and efficiency is improved, but requires additional measurement and control mechanisms
Solution Approach 1:
The patent implements feedback by continuously measuring electrical parameters (current, voltage) and using this information to determine when to transition between operational modes. This feedback mechanism enables the system to maintain optimal efficiency by adapting to real-time conditions while keeping the control logic relatively simple through well-defined transition thresholds.
Solution Approach 2:
The power converter performs self-service by automatically transitioning between operational modes based on its own measured electrical parameters without requiring external control intervention. The system monitors its own state and adjusts its operation accordingly, reducing the burden on external control systems while maintaining high efficiency.
3Ease of operation
If reverse current through coupled inductor is restricted, then control is simplified and performance is enhanced, but limits the operational flexibility of the converter
Solution Approach 1:
The patent applies segmentation by dividing the operational space into distinct modes (CCM and Semi-CCM) with clearly defined boundaries. By restricting reverse current in the Semi-CCM mode while maintaining full flexibility in CCM mode, the system simplifies control within each segment while preserving overall operational versatility through mode transitions.
Solution Approach 2:
The system maintains operational flexibility dynamically by allowing reverse current restriction only when operating in Semi-CCM mode under specific conditions. When full flexibility is needed, the system transitions to CCM mode where reverse current is permitted. This dynamic approach balances control simplicity with operational versatility based on real-time requirements.
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 solution enables efficient voltage conversion, reduces the size and cost of power converters, and simplifies control by restricting reverse current through the coupled inductor, enhancing overall power conversion performance and reliability.
Implementation Method 1
mutual inductance issues between windings of coupled inductors
Data Source
AI summary
A power converter comprising a shared coupled inductor having windings around a common core, a plurality of buck converters and a boost converter. The plurality of buck converters are coupled between a first terminal and a second terminal. The plurality of buck converters comprises a plurality of buck switching legs and the shared coupled inductor. The boost converter is coupled between a third terminal and a fourth terminal. The boost converter comprises a boost switching leg and the shared coupled inductor.