Parallel Power Switches for DC-DC Converter Efficiency
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Solution Overview
Problem
Conventional switched DC-DC converters exhibit efficiency peaks only at specific load currents due to fixed gate widths, leading to significant efficiency drops when operating outside this narrow window, as increasing switch dimensions to reduce ON-resistance increases capacitive losses and vice versa.
Innovation Solution
The electronic device employs two power switches with different gate widths connected in parallel, allowing for selective operation modes based on load current, including synchronous operation and varying duty cycles to optimize efficiency across a broader range of load currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed gate width is used in power switches, then device complexity is reduced, but efficiency is optimized only for a narrow load current window
Solution Approach 1:
Multiple power switches with different gate widths are connected in parallel, creating a universal power conversion system that can efficiently handle a wide range of load currents. Each switch is designed for optimal performance at specific current levels, and the driving stage selects the appropriate switch combination for the current load condition.
Solution Approach 2:
The system changes the effective gate width parameter by selectively activating different switches based on load current. This allows the system to adapt the power switch characteristics to match the operating conditions, maintaining high efficiency across a broad load current range rather than being limited to a single optimal point.
Data Source
AI summary
An electronic device for switched DC-DC conversion of an input voltage level into an output voltage level, comprising a first power switch and a second power switch, being connected in parallel and having a different gate width, and a driving stage that is configured to selectively drive the first power switch and/or second power switch depending on a load current output.