Dual DC-DC Converter Control for Stable Load Voltage
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Solution Overview
Problem
Existing power supply systems using multiple DC-DC converters struggle to maintain a consistent voltage supply to equipment as the load changes, leading to voltage fluctuations and inefficiencies.
Innovation Solution
A control device that manages a first and second DC-DC converter, where the first converter's output is fixed at maximum, and the second converter's output is adjusted through feedback control to ensure the demanded voltage is maintained irrespective of the equipment's load, by setting target voltage values for both converters based on load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one DC-DC converter is prioritized with high instructed voltage and another with low instructed voltage, then power supply priority is established, but voltage stability to equipment deteriorates under increased load
Solution Approach 1:
The control device dynamically switches between two control modes: normally prioritizing one DC-DC converter, but switching to feedback control of the second converter when the first reaches maximum output. This dynamic adaptation maintains voltage stability under varying load conditions.
Solution Approach 2:
When the prioritized DC-DC converter reaches maximum output, the control device applies feedback control to the second DC-DC converter, using voltage detection and comparison with reference voltage to adjust output and maintain stable voltage supply to equipment.
2Stability of the object's composition
If feedback control is applied to maintain voltage, then voltage stability improves, but control complexity increases
Solution Approach 1:
The control device segments the control strategy into two distinct modes: normal priority-based control and feedback control. This segmentation allows feedback control to be applied only when necessary (when first converter reaches maximum output), maintaining voltage stability without continuously increasing control complexity.
Solution Approach 2:
The control system dynamically selects between simple priority-based control and feedback control based on the operational state of the DC-DC converters, applying complexity only when required to maintain voltage stability.
Data Source
AI summary
A control device for controlling a first DC-DC converter and a second DC-DC converter that supply power to equipment, the control device comprising a processor configured to fix an output of the first DC-DC converter at a maximum and perform feedback control such that an output of the second DC-DC converter satisfies a predetermined condition in a case in which the output of the first DC-DC converter has reached the maximum.