Coupled-Inductor Power Converter With SCCM Reverse Current Control
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Solution Overview
Problem
Power converters, particularly those using coupled inductors, face challenges in efficiently controlling current flow and reducing complexity in operational modes, leading to issues with mutual inductance and reverse current restriction.
Innovation Solution
The introduction of a Semi-Continuous Current Mode (SCCM) operational mode, where one switch is maintained in a non-conducting state, and the use of a coupled inductor with buck and boost converters sharing a common core, allows for reduced complexity in control and minimizes reverse current flow by restricting current to one direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a coupled inductor is used in a buck-and-boost power converter, then the power conversion efficiency is improved and the device size is reduced, but the control complexity increases due to mutual inductance and bidirectional current flow requirements
Solution Approach 1:
The patent divides the operation into distinct modes (CCM and SCCM) with clear boundary conditions. By segmenting the operational space and assigning different control strategies to each mode, the overall control complexity is managed while maintaining the efficiency benefits of the coupled inductor architecture.
Solution Approach 2:
The patent inverts the conventional approach by restricting current flow to one direction only during SCCM operation, rather than allowing bidirectional flow. This inversion simplifies the control logic by eliminating the need to manage reverse current, while still achieving efficient power conversion through the coupled inductor.
2Adaptability or versatility
If Continuous Current Mode (CCM) is used with bidirectional current flow, then the power converter achieves flexible voltage conversion, but the control algorithm complexity and reverse current management difficulty increase
Solution Approach 1:
The patent implements dynamic mode switching between CCM and SCCM based on real-time operating conditions. The controller dynamically adjusts the operational mode to optimize performance while managing complexity, transitioning to SCCM when simplicity is prioritized and to CCM when maximum versatility is needed.
Solution Approach 2:
The patent changes the operational parameters by introducing SCCM as an alternative to traditional CCM. This parameter change (from bidirectional to unidirectional current flow) fundamentally alters the control requirements, reducing algorithm complexity while maintaining adaptability through mode selection.
3Device complexity
If Semi-Continuous Current Mode (SCCM) is used with unidirectional current flow, then the control complexity is reduced and reverse current is restricted, but the operational flexibility compared to bidirectional modes is limited
Solution Approach 1:
The patent makes the power converter universal by implementing multiple operational modes (CCM and SCCM) within the same hardware architecture. The coupled inductor topology supports both bidirectional and unidirectional current flow modes, allowing the device to adapt to different application requirements without hardware changes.
Solution Approach 2:
The controller automatically selects the appropriate operational mode based on system conditions, eliminating the need for external intervention to determine the optimal mode. The system self-adjusts between CCM and SCCM to maintain optimal performance while managing control complexity.
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
This approach enhances the efficiency of power conversion by reducing the complexity of control algorithms and minimizing reverse current issues, leading to improved performance and cost-effectiveness in power converter designs.
Implementation Method 1
a coupled inductor with buck and boost converters sharing a common core
Data Source
Figure 1A
Figure 1B
Figure 1C
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.