Voltage Converter Controller Light Load Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional voltage converters, such as LLC converters, face high switching losses during light load operations due to the need for magnetizing current to ensure zero voltage switching, leading to inefficiencies in power consumption, especially in standby modes where only minimal power is required.
Innovation Solution
A voltage converter controller system that operates in two modes: normal mode, where it regulates based on feedback signals for full power output, and low power mode, where it controls the system based on supply voltage to minimize power consumption, by potentially disabling the power factor correction stage and fixing the switching frequency or peak current, ensuring sufficient supply voltage for the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetizing current is used to ensure zero voltage switching in LLC converter, then switching reliability is improved, but switching losses increase at light load
Solution Approach 1:
The controller dynamically switches between two control modes: in normal mode it uses feedback-based control with magnetizing current for reliable zero voltage switching, while in low power mode it transitions to supply voltage-based control that reduces or eliminates magnetizing current, thereby adapting the switching behavior to load conditions and reducing switching losses at light load
2Loss of energy
If auxiliary supply stage is added for light load operation, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The main power stage is designed to perform multiple functions: it handles full load operation during normal mode and simultaneously provides light load operation during low power mode. The controller enables the main stage to adapt its operation mode based on load conditions, eliminating the need for a separate auxiliary supply stage while maintaining the ability to operate efficiently across the full power range
3Measurement precision
If feedback-based control is used in normal mode, then output voltage regulation is improved, but power consumption increases in low power mode
Solution Approach 1:
The controller dynamically switches between two control modes: in normal mode it uses feedback-based control for precise output voltage regulation, while in low power mode it transitions to supply voltage-based control that consumes less power. This dynamic adaptation allows the system to optimize between regulation precision and power consumption based on operational requirements
Data Source
AI summary
Voltage converter controllers, voltage converter systems and corresponding methods are provided. In normal operation, a voltage converter stage of the system is controlled based on a feedback voltage from an output. In a low power mode, the system is controlled based on a supply voltage provided to a controller of the system.