Multiphase Stacked Interleaved Buck Converter Switch Modulation
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Solution Overview
Problem
Conventional methods for modulating switches in interleaved converters require gradual analysis of inductor charge and discharge states, leading to low operation efficiency due to increased current stress and limited fault tolerance.
Innovation Solution
A method for modulating switches in a multiphase stacked interleaved buck converter that acquires and adjusts charge-discharge state information across multiple primary and secondary loops to control switch states, reducing the need for gradual analysis and enhancing efficiency by eliminating current ripples and distributing current stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gradual analysis method is used to control switch states, then the converter can operate with basic functionality, but the operation efficiency is low due to increased current stress and time-consuming analysis
Solution Approach 1:
The patent pre-establishes the correspondence relationship between bridge arms and loops, and pre-defines the control rules for switch states based on charge-discharge states. This preliminary preparation eliminates the need for gradual analysis during operation, allowing the controller to directly determine switch states based on real-time charge-discharge information, thereby improving operation efficiency and reducing analysis time.
2Reliability
If conventional interleaved control is used, then the converter can cancel output ripples at 50% duty cycle, but the current stress on switches increases and fault tolerance is reduced
Solution Approach 1:
The patent divides the converter into multiple independent bridge arms, each controlling a specific loop. Each bridge arm can operate independently with its own switch state control, allowing the system to segment the current paths and reduce current stress on individual switches. This segmentation also enables fault isolation, improving overall system reliability and fault tolerance.
Solution Approach 2:
The patent dynamically adjusts switch states based on real-time charge-discharge states of loops rather than using fixed interleaved control patterns. This dynamic control allows the system to optimize current distribution and reduce peak current stress on switches while maintaining ripple cancellation performance across varying duty cycles, and enhances fault tolerance by adapting to changing operational conditions.
Data Source
AI summary
The present disclosure discloses a method for modulating a switch of a converter. The method is applicable to a topological structure of a multiphase stacked interleaved buck converter, and includes: acquiring charge-discharge state information in the topological structure, wherein the charge-discharge state information comprises at least a first charge-discharge state of any one phase primary loop, a second charge-discharge state of a secondary loop corresponding to the any one phase primary loop, a third charge-discharge state of another primary loop, and a fourth charge-discharge state of another secondary loop; and adjusting, based on the first charge-discharge state, a closed state of a switch disposed on a bridge arm connected to the any one phase primary loop, and adjusting, based on the second charge-discharge state and the third charge-discharge state, a closed state of a switch disposed on another bridge arm.