Power Supply Synchronous Asynchronous Mode Switching
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Solution Overview
Problem
Existing power supplies face inefficiencies at varying output current levels, with asynchronous modes being more efficient at lower currents and synchronous modes at higher currents, leading to a non-linear efficiency response across the entire current range.
Innovation Solution
A power supply design that incorporates both asynchronous and synchronous modes of operation, using diodes and switches in conjunction with a controller to switch between modes based on output current thresholds, allowing current to flow through diodes at lower currents and switches at higher currents, optimizing efficiency across a broader range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single mode is used across all current ranges, then device complexity is reduced, but efficiency across the entire current range deteriorates
Solution Approach 1:
The power supply incorporates both asynchronous and synchronous operational capabilities within a single device. The controller is designed to handle both modes, and the circuit includes components (diodes and switches) that enable both operating configurations, making the system multi-functional and adaptable to different load conditions.
Solution Approach 2:
The system transitions dynamically between two operational states based on load conditions. This dynamic capability allows the power supply to maintain high efficiency across the entire current range without requiring separate power supply units for different operating conditions.
Data Source
AI summary
The present disclosure relates to power supplies and control methods for power supplies. Example power supplies include an output terminal, a transformer having a secondary winding including a first terminal and a second terminal, first and second diodes coupled between the output terminal and the first and second terminals, respectively, first and second switches coupled between the output terminal and the first and second terminals, respectively, and a controller coupled to the first switch and the second switch. The controller is configured to control the power supply in an asynchronous mode when output current is below a defined threshold so current flows to the output terminal through the first diode and the second diode, and to control the power supply in a synchronous mode when output current is above the defined threshold so current flows to the output terminal through the first switch and the second switch.