Multiphase DC/DC Converter Phase Alignment for Transient Response
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Solution Overview
Problem
Conventional multiphase DC/DC converters face challenges in transient response, overvoltage protection, and drive frequency stability, particularly when dealing with sharp changes in load current or voltage, and have limitations in drive phase management and noise resistance.
Innovation Solution
A multiphase DC/DC converter system with a control circuit that includes a load state detection portion to adjust the output phases of DC/DC converters based on load conditions, an overvoltage protection mechanism that ensures rapid voltage regulation, and a frequency control mechanism to maintain constant drive frequency regardless of the number of drive phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the multiphase DC/DC converter drives multiple phases simultaneously with fixed on-time mode, then the drive frequency is stable, but the on-duty of each phase is limited to 100/m% and cannot respond to sharp current increases
Solution Approach 1:
The patent applies dynamics by making the drive mode switchable between fixed on-time mode and fixed frequency mode based on load conditions. The control circuit detects load state and dynamically adjusts the operating mode, allowing the system to transition from a static configuration to a dynamic one that adapts to changing current demands, thereby resolving the contradiction between voltage stability and current response capability
Solution Approach 2:
The patent changes the operational parameters of the DC/DC converter by switching between two distinct drive modes. In fixed on-time mode, the on-duty is constrained to 100/m%, but in fixed frequency mode, the on-duty can exceed this limit during transient periods. This parameter change allows the system to overcome the duty cycle limitation and provide sufficient current during sharp increases while maintaining stability during normal operation
2Productivity
If the multiphase DC/DC converter uses phase deviation drive mode, then the current output capability is improved, but the transient response characteristic deteriorates during sharp current changes
Solution Approach 1:
The patent uses dynamics by implementing a dual-mode drive system where the control circuit can switch between phase deviation mode and aligned phase mode based on load conditions. During transient periods requiring fast response, the system switches to aligned phase mode where all phases operate simultaneously, providing rapid current increase. During steady-state operation, it returns to phase deviation mode for efficient current output, thus dynamically optimizing both response speed and current capability
Solution Approach 2:
The patent applies periodic action through the cyclic switching between different drive modes based on load detection. The control circuit periodically evaluates the load state and adjusts the drive mode accordingly, creating a rhythmic adaptation pattern that optimizes transient response during current increases while maintaining efficient current output during steady-state, thereby resolving the contradiction between response speed and current capability
3Productivity
If the multiphase DC/DC converter increases the number of drive phases, then the current output capability is improved, but the drive frequency becomes unstable and noise resistance deteriorates
Solution Approach 1:
The patent changes the drive frequency parameter dynamically based on the number of active phases. When more phases are activated to increase current output capability, the control circuit adjusts the drive frequency to maintain stability. This parameter adjustment ensures that even with multiple phases operating, the system maintains consistent switching frequency, thereby preserving noise resistance while achieving high current output capability
4Reliability
If the multiphase DC/DC converter limits on-duty to 100/m%, then the drive frequency is stable, but the output voltage drops during sharp current increases
Solution Approach 1:
The patent applies dynamics by implementing a dual-mode drive system where the control circuit can switch between fixed on-time mode and fixed frequency mode based on load conditions. During transient periods requiring fast response, the system switches to aligned phase mode where all phases operate simultaneously, providing rapid current increase. During steady-state operation, it returns to phase deviation mode for efficient current output, thus dynamically optimizing both response speed and current capability
Data Source
AI summary
A multiphase DC/DC converter according to the present invention includes: a plurality of DC/DC converters whose outputs are connected in common to supply electric power to a load; a load state detection portion which detects a state of the load connected to the plurality of DC/DC converters and outputs a detection result; and a control circuit which drives each of the plurality of DC/DC converters based on outputs from the plurality of DC/DC converters, and based on an output from the load state detection portion, drives the plurality of DC/DC converters with output phases of the plurality of DC/DC converters deviated from each other or with the output phases of the plurality of DC/DC converters aligned with each other.