Power Converter Controller with Mode-Adaptive Error Amplifier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power converters operating in both buck and boost modes face inefficiencies due to discontinuities in control processes during transitions between modes, lacking an effective controller to manage these changes smoothly.
Innovation Solution
A controller with an error amplifier and a switch that couples input terminals to either an operating characteristic or reference voltage based on the power conversion mode, along with an output filter incorporating an inductor and capacitor, stabilizes the output voltage by adjusting duty cycles and preventing cross-conduction losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power converter is configured to operate in both buck and boost modes, then the adaptability of the power converter is improved, but discontinuities in control process and inherent inefficiencies occur during transitions between modes
Solution Approach 1:
The patent implements dynamic reconfiguration of the control loop by selectively coupling the error amplifier inputs based on operating mode. The controller dynamically switches between buck and boost control configurations, ensuring continuous and efficient control process during mode transitions without energy loss or discontinuities.
2Stability of the object's composition
If the controller dynamically adjusts duty cycle to maintain output voltage, then the output voltage stability is improved, but control complexity increases during mode transitions
Solution Approach 1:
The patent employs a universal controller architecture that handles both buck and boost modes through a single integrated control loop. The error amplifier and associated circuitry are configured to perform dual functions by selective coupling, eliminating the need for separate control circuits for each mode and reducing overall controller complexity.
Solution Approach 2:
The patent introduces a mode-detection mechanism that acts as an intermediary between the power conversion stage and the error amplifier. This intermediary automatically detects the operating mode and reconfigures the control loop accordingly, simplifying the controller design by automating the mode-transition management without requiring complex manual intervention.
3Measurement precision
If separate control loops are used for buck and boost modes, then the control precision for each mode is improved, but the device complexity and transition discontinuities increase
Solution Approach 1:
The patent implements a universal error amplifier that serves both buck and boost control functions through selective input coupling. The same control loop infrastructure maintains precision for both modes by reconfiguring which inputs are active, eliminating the need for separate control loops while preserving control signal precision.
Solution Approach 2:
The patent merges the buck and boost control loops into a single integrated control structure. By combining the error amplifier, feedback network, and control logic into one unified system that can be reconfigured based on mode, the patent reduces complexity while maintaining the precision benefits of dedicated control loops for each operating mode.
Data Source
AI summary
A controller and an output filter for a power converter, and a power converter employing at least one of the same. In one embodiment, the controller includes an error amplifier with first and second input terminals coupled to one of an operating characteristic and a reference voltage of the power converter, and a switch configured to couple the first and second input terminals to one of the operating characteristic and the reference voltage as a function of a power conversion mode of the power converter. In one embodiment, the output filter includes an output filter capacitor with a first terminal coupled to a first output terminal of a power converter, and an output filter inductor coupled between a second terminal of the output filter capacitor and a second output terminal of the power converter.