DC-DC Converter Closed-Loop Control for Inrush Current Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current intermediate bus architecture (IBA) DC-DC conversion systems face inefficiencies due to uncontrollable output voltage and inrush currents, especially with increasing power demands and shrinking circuit board areas, which necessitate improved efficiency and voltage regulation.
Innovation Solution
A DC-DC conversion circuit employing a closed-loop control system with an output voltage detection module, input voltage detection module, reference voltage generating module, comparing module, control module, and driving module, which adjusts the duty cycle of switching transistors based on feedback signals to maintain efficient voltage regulation and reduce inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If open-loop control with fixed duty cycle is used, then conversion efficiency is improved, but output voltage controllability deteriorates
Solution Approach 1:
The patent implements a closed-loop control system that detects the output voltage and feeds it back to the control module. The control module compares the detected output voltage with a reference voltage and dynamically adjusts the duty cycle of switching transistors to maintain stable output voltage. This feedback mechanism resolves the contradiction by enabling voltage controllability while maintaining high efficiency through optimized duty cycle adjustment.
2Power
If power supply capacity is increased, then power output is improved, but inrush current increases
Solution Approach 1:
The patent employs a soft-start mechanism that gradually increases the duty cycle from zero to the target value during power-on or voltage transient conditions. This preliminary action prevents sudden inrush currents by controlling the switching transistors to ramp up power delivery progressively, thereby enabling high power output without generating excessive inrush current.
3Area of stationary object
If circuit board area is reduced, then device compactness is improved, but power density requirement increases
Solution Approach 1:
The patent optimizes the operating parameters of the DC-DC conversion circuit, including switching frequency and duty cycle, to maximize power conversion efficiency. By changing these parameters dynamically based on load conditions and implementing loss reduction techniques, the circuit achieves high power density within a compact form factor, enabling high power output from reduced circuit board area.
Data Source
AI summary
According to the DC-DC conversion circuit and conversion method, variation of an input voltage is reflected by detecting a voltage at a secondary winding of a transformer, a reference voltage is adjusted by using the detected input voltage signal, a feedback voltage signal is compared with the reference voltage, a duty cycle control signal is adjusted according to a comparison result, and conduction and shutting-down of switching transistors are controlled according to the duty cycle control signal to adjust an output voltage of the DC-DC conversion circuit, so as to enable the output voltage to vary with the input voltage.