Multiphase DC/DC Converter Control for Low Ripple Across Load States
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Solution Overview
Problem
Existing multiphase DC/DC converters face increased ripple noise in output voltage when multiple channels are activated, particularly in states with varying load currents, as the cancellation effect is diminished when only a single converter is active.
Innovation Solution
A DC/DC converter design with specific inductance values for channels, where the first and second channels have a larger inductance than the third, and control mechanisms to activate the first channel alone in light-load states and operate the first and second channels in-phase with the third out-of-phase in heavy-load states, reducing ripple noise across load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If all channels are activated to handle large load current, then the load current capacity is improved, but the ripple noise in output voltage increases
Solution Approach 1:
The patent applies different inductance values to different channels based on their operational role. Channels 1 and 2 use a first inductance value optimized for ripple cancellation, while Channel 3 uses a second inductance value optimized for light-load efficiency. This local differentiation allows the system to maintain low ripple noise during heavy-load operation while preserving efficiency during light-load operation.
Solution Approach 2:
The patent introduces asymmetry in the inductor design by using different inductance values for different channels rather than uniform inductors. Specifically, L1 and L2 have one inductance value while L3 has a different value, creating an asymmetric configuration that enables selective activation strategies to minimize ripple noise under various load conditions.
2Loss of energy
If only a single channel is activated to improve efficiency in light-load state, then the energy consumption is reduced, but the ripple noise in output voltage increases
Solution Approach 1:
The patent implements dynamic channel activation control based on real-time load conditions. The controller selectively activates Channel 3 when load current is below a threshold for efficiency, and activates Channels 1 and 2 when load current exceeds the threshold for ripple reduction. This dynamic switching strategy optimizes the balance between energy efficiency and ripple noise performance.
Solution Approach 2:
The patent changes the operational parameters (channel activation state) based on load conditions. By monitoring load current and adjusting which channels are active, the system transitions between different operational modes: single-channel mode for light loads and multi-channel mode for heavy loads, thereby adapting to varying requirements for efficiency and noise performance.
3Loss of energy
If inductors have different inductance values to optimize light-load efficiency, then the energy efficiency is improved, but the ripple noise cancellation effect deteriorates
Solution Approach 1:
The patent segments the inductor functions by creating specialized inductors for different purposes. Inductors L1 and L2 are designed with one inductance value specifically for ripple noise cancellation during multi-channel operation, while inductor L3 is designed with a different inductance value for optimizing light-load efficiency. This functional segmentation allows each inductor to be optimized for its specific operational context.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design effectively reduces ripple noise in both light and heavy-load states by leveraging inductive cancellation, maintaining low noise levels regardless of load current variations.
Implementation Method 1
a plurality of channels each including a switching circuit and an inductor
Data Source
AI summary
A DC/DC converter includes: multiple channels each including a switching circuit and an inductor; an output line having one end connected to the other end of the inductors of the multiple channels and the other end connected to a load; and a controller. The multiple channels include first to third channels, and the inductors of the first and second channels have a larger inductance value than the inductor of the third channel. When current flowing in the load is first current, the controller controls the switching circuits so that only the first channel is activated; and when the current flowing in the load is second current that is larger than the first current, the controller controls the switching circuits so that the first and second channels are operated in-phase and the third channel is operated in a phase different from the phase of the first and second channels.