Switching Converter Sleep Control for Ultra-Low No-Load Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switching power supplies face significant power loss under no load or light load conditions, failing to meet the requirement for extremely low no load power consumption.
Innovation Solution
A control circuit for a switching converter that includes an output feedback circuit and a sleep mode determining circuit, which configures the output feedback circuit to a cut-off state when the load is disconnected, entering a sleep mode to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switching power supply operates under no load or light load condition using pulse skipping mode or burst mode, then switching loss is reduced, but certain power loss still remains that cannot satisfy extremely low no load power consumption requirement
Solution Approach 1:
The patent implements dynamic operation modes that adapt to load conditions. The control circuit dynamically switches between different operating states based on whether a load is detected, enabling the system to optimize performance for each condition. This dynamic adaptation allows the power supply to achieve extremely low no-load power consumption while maintaining full power supply capability when needed.
Solution Approach 2:
The patent changes key operating parameters based on load conditions. When no load is detected, the control circuit modifies parameters such as switching frequency, duty cycle, and feedback circuit state to minimize power consumption. These parameter changes enable the system to transition from normal operation to a low-power state that satisfies extremely low no-load requirements.
2Loss of energy
If output feedback circuit maintains normal connection state under no load condition, then output voltage regulation is maintained, but power consumption increases
Solution Approach 1:
The patent segments the feedback circuit operation into distinct states based on load conditions. The output feedback circuit is divided into a normal connection state for loaded operation and a cut-off state for no-load operation. This segmentation allows the system to maintain voltage regulation when needed while eliminating feedback circuit power consumption during no-load conditions.
Solution Approach 2:
The patent implements periodic detection of load conditions and corresponding periodic switching of the feedback circuit state. The control circuit periodically checks for load presence and transitions the feedback circuit between active and cut-off states accordingly. This periodic action ensures the system responds appropriately to load changes while minimizing power consumption during extended no-load periods.
Data Source
AI summary
A switching converter includes a voltage converting circuit, an output feedback circuit and a switch control circuit. The voltage converting circuit is configured to convert an input voltage into an output voltage. The output feedback circuit is coupled to receive the output voltage and configured to provide an output feedback signal. The switch control circuit is coupled to the output feedback circuit to receive the output feedback signal and configured to generate a switch control signal to control the voltage converting circuit. Where during a time period when a load is disconnected from the switching converter, in response to the output voltage decreasing to a first output threshold, the output feedback circuit is configured to be a cut off connection state.