Multi-Phase DC/DC Converter Phase Control for Load Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing step-down multi-phase DC/DC converters face challenges in enhancing power source characteristics, such as load response performance and power efficiency, particularly in achieving high load response performance while minimizing device size.
Innovation Solution
A semiconductor device configuration that includes multiple output-stage circuits with a phase difference in switch-driving, an error voltage generator, feedback pulsating voltage generator, on timing sequence generator, and switch control portion to adjust on-times of output transistors, ensuring a phase difference and current balance across the circuits, utilizing a phase-locked loop to match switching frequencies and balance currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-phase switching is implemented to improve load response performance, then power efficiency is improved, but device size and coil size increase
Solution Approach 1:
The DC/DC converter is divided into multiple independent output-stage circuits that operate in parallel with phase differences. Each circuit processes a portion of the total power, allowing smaller individual coils and components while achieving high overall productivity through coordinated multi-phase operation.
2Loss of energy
If multiple output-stage circuits are added to enhance power efficiency, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The switch control portion implements a universal control mechanism that manages multiple output-stage circuits using a standardized phase-difference timing sequence. This multi-functional controller handles synchronization, phase shifting, and current balancing across all circuits, reducing overall system complexity despite the increased number of power stages.
3Productivity
If phase difference is introduced in switch-driving to improve load response, then load response performance is improved, but current imbalance occurs
Solution Approach 1:
The switch control portion incorporates feedback mechanisms that monitor current levels in each output-stage circuit and dynamically adjust switching timings to maintain current balance. The controller detects current imbalance conditions and modifies phase differences in real-time, ensuring stable operation while preserving high load response performance.
Data Source
AI summary
The disclosure relates to a semiconductor device and a step-down multi-phase DC/DC converter. A DC/DC converter having higher load response performance and efficiency is provided. The step-down multi-phase DC/DC converter includes multiple output-stage circuits, which generate multiple switch voltages in rectangular waves by means of switching an input voltage, and an output voltage is obtained by means of rectifying and smoothing the multiple switch voltages. An error voltage is generated on the basis of a feedback voltage corresponding to the output voltage and a reference voltage, multiple feedback pulsating voltages variant with the multiple switch voltages are generated on the basis of the feedback voltage, and an on timing sequence including multiple on timings is generated according to the generated voltages. The multiple output circuits are switch-driven sequentially according to the on timing sequence, so as to set phase differences for the switch-driving.