Multi-Phase Switching Converter Current Injection for Ripple Control
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Solution Overview
Problem
Switching power converters face challenges in minimizing ripple current magnitude and achieving fast transient response due to inherent limitations in their design, particularly related to the interaction between transformer and inductor configurations.
Innovation Solution
The implementation of a multi-phase switching power converter that injects current into an output power node to cancel ripple current or enhance transient response by adjusting the coupling of secondary windings with respect to primary windings, utilizing a boosted coupled inductor configuration to minimize leakage inductance and optimize the turns ratio for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional switching power converter design is used, then high efficiency is achieved, but ripple current magnitude increases
Solution Approach 1:
The patent divides the power conversion process into multiple phases with separate switching cycles. Each phase processes power independently through its own switching devices, allowing ripple currents from different phases to cancel each other out while maintaining high efficiency in each individual phase.
Solution Approach 2:
The patent combines multiple phase outputs into a single integrated converter system. By merging the outputs of multiple phases that operate with staggered switching cycles, the system achieves both high efficiency (inherited from individual phases) and reduced ripple current (through constructive interference of opposing ripple components).
2Object-generated harmful factors
If energy storage devices are sized for stability, then ripple current is reduced, but transient response speed decreases
Solution Approach 1:
The patent implements dynamic control of multiple phases where each phase can independently adjust its switching characteristics. During transient conditions, the controller dynamically modulates the switching duty cycles and frequencies of individual phases to rapidly respond to load changes, while maintaining stable operation during steady-state conditions.
Solution Approach 2:
The patent uses periodic switching of multiple phases with different duty cycles and switching frequencies. This periodic action allows energy storage devices to be charged and discharged in a controlled manner, providing both ripple current reduction through averaging and fast transient response through coordinated phase switching during load changes.
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
This configuration effectively reduces ripple current magnitude and enhances transient response, offering improved performance compared to conventional switching power converters by strategically managing the injection of current through secondary windings relative to primary windings.
Implementation Method 1
A transformer exhibits magnetizing inductance and leakage inductance. Magnetizing inductance is inductance associated with magnetic flux linking the primary and secondary windings
Implementation Method 2
A coupled inductor exhibits magnetizing inductance, which is inductance associated with magnetic flux linking the windings of the coupled inductor
Implementation Method 3
leakage inductance is inductance associated with magnetic flux generated by current flowing through one of the primary and secondary windings that does not couple to any other winding of the transformer
Data Source
AI summary
A switching power converter includes a plurality of power stages and a blocking capacitor. Each power stage includes a respective power transformer. The blocking capacitor and a respective secondary winding of each power transformer are electrically coupled in series between an output power node of the switching power converter and a reference node of the switching power converter. Another switching power converter includes a plurality of power stages, a boost winding, and a blocking capacitor. Each power stage includes a respective power transfer winding, and the boost winding forms at least one turn around a respective leakage magnetic flux path of each power transfer winding. The blocking capacitor and the boost winding are electrically coupled in series between an output power node of switching power converter and a reference node of the switching power converter.