Switching Power Supply Mode Transition Synchronization
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Solution Overview
Problem
Switching between asynchronous and synchronous control modes in switched-mode power supplies can cause disruptions and output voltage deviations, potentially leading to unintended resets or damage to electronic components.
Innovation Solution
A control unit that synchronizes the phase and frequency of the asynchronous controller with the clock signal of the synchronous controller, presets state variables, and seamlessly transfers control from the asynchronous to the synchronous controller, maintaining output voltage stability during mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switching between asynchronous and synchronous control modes is implemented to improve efficiency across different load conditions, then light load efficiency is improved, but output voltage stability deteriorates during mode transitions
Solution Approach 1:
The patent applies preliminary action by synchronizing the asynchronous controller's phase and frequency with the synchronous controller's clock signal before the actual mode transition occurs. This preparatory synchronization ensures that when the transition happens, the output voltage remains stable without deviations, thus resolving the contradiction between improving light load efficiency through mode switching and maintaining output voltage stability during transitions.
2Loss of energy
If mode switching is performed to optimize performance across different operating conditions, then overall power efficiency is improved, but the risk of unintended resets increases
Solution Approach 1:
The patent performs preliminary synchronization of the asynchronous controller with the synchronous controller's clock signal before mode transition. This advance preparation ensures that the transition occurs under controlled conditions, preventing unintended resets and maintaining system reliability while still allowing efficiency optimizations through mode switching.
Solution Approach 2:
The patent employs feedback mechanisms to monitor the synchronization status and output voltage during mode transitions. By continuously monitoring and adjusting based on feedback signals, the system ensures that transitions occur only when synchronization criteria are met, thereby preventing unintended resets while maintaining the ability to switch modes for efficiency optimization.
Data Source
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AI summary
Embodiments of a switched-mode power supply and a method for operating a switched-mode power supply involve synchronizing a phase and frequency of an asynchronous controller of the switched-mode power supply with a clock signal of a synchronous controller of the switched-mode power supply while the asynchronous controller is in control of a power stage of the switched-mode power supply, concurrent with synchronizing the phase and frequency of the asynchronous controller with the clock signal of the synchronous controller, presetting a state variable of the synchronous controller while the asynchronous controller is in control of the power stage of the switched-mode power supply, and switching control of the power stage from the asynchronous controller to the synchronous controller after the phase and frequency of the asynchronous controller are synchronized with the clock signal of the synchronous controller and after the state variable of the synchronous controller is preset.