Power Supply Control Device Minimum ON Width Setting
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Solution Overview
Problem
Conventional power supply control devices have a high power consumption at light load or no load conditions, as they lack efficient mechanisms to reduce energy usage during these states.
Innovation Solution
A power supply control device with a minimum ON width setting part that adjusts the switching duration of the output switch based on the load, implementing mode switching and burst control to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output switch maintains a fixed minimum ON width for reliable operation, then the switching power supply operates reliably under various loads, but power consumption increases during light load or no load conditions
Solution Approach 1:
The patent applies dynamics by making the minimum ON width of the output switch variable rather than fixed. The control device dynamically adjusts the minimum ON width based on load conditions - extending it during light load or no load to reduce switching frequency and power consumption, while maintaining it at standard levels during heavy load for reliable operation. This dynamic parameter adjustment resolves the contradiction between reliability and power consumption.
2Speed
If the switching frequency is kept high for responsive load regulation, then the power supply responds quickly to load changes, but power consumption increases during standby and light load conditions
Solution Approach 1:
The patent implements periodic action by introducing burst mode operation where the switching regulator operates in intermittent cycles. During light load or no load, instead of continuous high-frequency switching, the regulator performs periodic switching bursts separated by idle periods. This reduces average power consumption while maintaining the ability to respond quickly to load changes when needed.
Data Source
AI summary
There is provided a power supply control device as a control main entity of a switching power supply. The power supply control device includes a minimum ON width setting part configured to set a minimum ON width of an output switch according to a load.