Multi-output Power Supply Duty Control for Voltage Balance
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Solution Overview
Problem
General multi-output power supply devices face issues with power imbalance among output voltages due to changes in load states, such as excessively light loads or overloads, which affect power conversion efficiency and increase component count and fabrication costs.
Innovation Solution
A multi-output power supply apparatus that includes a controller to detect power states and limit the switching duty range of the power supply unit, using a current generation unit, signal generation unit, monostable unit, driving unit, and duty range limiting unit to maintain balanced output voltages by adjusting the switching duty based on load states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a step-down chopper circuit is added to each output terminal to maintain voltage balance, then voltage balance is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent extracts the voltage balance control function from individual output terminals and centralizes it in the primary switching control. By removing the need for step-down chopper circuits at each output and instead controlling the primary switching duty ratio, the invention eliminates redundant components while maintaining voltage balance across all outputs.
Solution Approach 2:
The primary switching control is designed to serve multiple output terminals simultaneously. A single switching control mechanism manages voltage balance for all outputs through unified duty ratio control, making the control system universal rather than requiring separate control circuits for each output terminal.
2Loss of energy
If the switching duty ratio is increased to handle light load conditions, then power conversion efficiency is improved, but power imbalance among outputs worsens
Solution Approach 1:
The patent implements feedback control by detecting the actual output voltages and using this information to adjust the switching duty ratio. The controller continuously monitors output voltages and modifies the duty ratio to maintain both high efficiency and proper power balance, preventing the imbalance that would result from fixed duty ratio increases.
Solution Approach 2:
The switching duty ratio is made dynamic rather than fixed. The controller adjusts the duty ratio in real-time based on load conditions and output voltage measurements, allowing the system to optimize efficiency during light loads while maintaining power balance during varying load conditions.
Data Source
AI summary
There is provided a multi-output power supply apparatus capable of maintaining multiple output voltages in a balanced state by limiting a variable range of a switching duty according to a load state. The multi-output power supply apparatus includes: a power supply unit switching input power to output a plurality of voltages whose power levels are determined according to the switching operation; and a controller detecting power states of at least some of the plurality of voltages from the power supply unit, and limiting a range of a switching duty of the power supply unit to a pre-set range when the detected power states correspond to a pre-set limited power state.