SIMO DC-DC Converter Cross-Regulation Control via Dynamic Weighting
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Solution Overview
Problem
Single-Inductor Multi-Output (SIMO) DC-DC converters face interference issues due to cross-regulation among output terminals, particularly when there are abrupt changes in load, leading to instability and inaccuracies in output voltages.
Innovation Solution
A DC-DC converter driving device with an error detector, interference detector, reference voltage compensator, and switch controller that compares feedback voltages with compensation reference voltages to generate error voltages, determines priority, and adjusts output voltages using interference control signals and weight assignments to compensate for interference, thereby stabilizing output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a SIMO DC-DC converter is used to reduce cost and area, then manufacturing cost and device area are reduced, but output voltage stability and accuracy deteriorate due to cross-regulation interference
Solution Approach 1:
The patent implements a feedback mechanism where the controller detects output voltages from multiple terminals and adjusts switching duties dynamically to compensate for cross-regulation interference, thereby maintaining output voltage stability while using a cost-effective SIMO architecture
Solution Approach 2:
The controller changes switching parameters (duty cycles) of different switching elements based on detected output voltage levels and interference detection results, adjusting these parameters in real-time to counteract cross-regulation effects and maintain stable output voltages
2Area of stationary object
If a SIMO DC-DC converter is used to reduce device area, then area is reduced, but output voltage accuracy deteriorates due to interference between output terminals
Solution Approach 1:
The controller continuously monitors output voltages at multiple terminals and uses this feedback information to adjust switching duties, compensating for cross-regulation interference and maintaining accurate output voltage levels despite the compact SIMO structure
Solution Approach 2:
The interference detector proactively identifies potential cross-regulation interference before it significantly affects output voltage accuracy, allowing the controller to preemptively adjust switching parameters to prevent voltage deviations
3Adaptability or versatility
If load changes abruptly at output terminals, then adaptability to load changes is improved, but output voltage stability deteriorates due to cross-regulation interference
Solution Approach 1:
The controller dynamically adjusts switching duties in real-time based on detected load changes and their impact on output voltages, enabling the system to adapt to varying load conditions while maintaining stable output voltages despite cross-regulation interference
Solution Approach 2:
The feedback mechanism detects voltage deviations caused by abrupt load changes and triggers compensatory adjustments to switching parameters, allowing the system to rapidly respond to load variations while counteracting interference effects
Data Source
AI summary
Provided are a DC-DC converter driving device and a driving method thereof, the DC-DC converter driving device including an error detector configured to compare a first feedback voltage corresponding to a first output terminal with a first compensation reference voltage to generate a first error voltage, and configured to compare a second feedback voltage corresponding to a second output terminal with a second compensation reference voltage to generate a second error voltage, an interference detector configured to determine interference between the first and second output terminals on the basis of the first and second error voltages to generate an interference error voltage, and a reference voltage compensator configured to assign a weight to the interference error voltage to generate the first and second compensation reference voltages, and thus priorities are determined for outputs of the DC-DC converter and weights according thereto are assigned to reduce occurrence of cross-regulation.