Three-Phase Resonant Converter Topology for Natural Current Sharing
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Solution Overview
Problem
Multi-phase interleaved resonant converters face issues with unbalanced load current distribution due to manufacturing deviations and environmental changes, leading to reduced efficiency, reliability, and life, along with a large number of components.
Innovation Solution
A three-phase interleaved resonant converter design with a circuit topology where the first, second, and third output nodes are connected in series with resonant inductors, and then connected to a triangular configuration formed by alternately connected resonant capacitors and primary windings of transformers, allowing for natural current sharing without additional control means, reducing the number of components and volume of capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-phase interleaved resonant converter is used to reduce output current ripple and improve power density, then the output current ripple is reduced and power density is improved, but current imbalance occurs due to manufacturing deviations and parameter differences
Solution Approach 1:
The patent employs a current sharing mechanism that automatically balances the current distribution among parallel phases without external control. The circuit topology includes current sharing inductors and control switches that detect and correct current imbalances autonomously, allowing the system to self-regulate and maintain reliable operation despite manufacturing variations
Solution Approach 2:
The patent implements a feedback-based current sharing control system where the current status of each phase is monitored and used to adjust the switching states. This feedback mechanism ensures that phases with higher current draw are automatically adjusted, maintaining balanced current distribution and system reliability
2Reliability
If traditional multi-phase interleaved resonant converter topology is used, then current sharing capability is achieved, but the number of components is large
Solution Approach 1:
The patent merges the current sharing function with the existing resonant converter components. The current sharing inductors are integrated into the resonant circuit structure, and the control switches are combined with the existing switching devices, eliminating the need for separate current sharing control circuits and reducing overall component count
Solution Approach 2:
The patent designs components to serve multiple functions: the resonant inductors and capacitors simultaneously perform resonance and current sharing, while the switching devices handle both power conversion and current balancing. This multi-functionality reduces the total number of components required
3Reliability
If additional current sharing control means are added to achieve current balance, then current balance is improved, but the device complexity and number of components increase
Solution Approach 1:
The patent implements a self-regulating current sharing mechanism where the circuit topology automatically detects and corrects current imbalances without external control. The current sharing inductors and integrated switches create inherent feedback that equalizes current distribution, eliminating complex external control systems
Solution Approach 2:
The patent introduces current sharing inductors as intermediary elements that mediate between the parallel phases. These inductors provide a natural coupling path that equalizes current distribution through magnetic coupling, avoiding the need for complex electronic control circuits
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 solution achieves balanced current sharing during operation, reduces the volume of resonant capacitors by two-thirds, improves power density, and enhances efficiency by eliminating the need for additional current sharing control, while maintaining soft switching capabilities.
Implementation Method 1
LLC resonant converter implements the primary-side zero voltage switching (ZVS) and the secondary-side zero voltage switching/zero current switching (ZCS)
Implementation Method 2
The three-phase transformer includes three transformers
Data Source
AI summary
Disclosed is a three-phase interleaved resonant converter, which includes a three-phase inversion circuit connected to an input voltage and including a first output node, a second output node, and a third output node, a three-phase transformer including three transformers, a three-phase resonant circuit including three resonant capacitors and three resonant inductors, and a three-phase rectifier filter circuit. One ends of the three resonant inductors are respectively connected to the first output node, the second output node and the third output node, and the other ends of the three resonant inductors are respectively connected to a triangular configuration formed by an alternate connection of the three resonant capacitors with primary windings of the three transformers. The three-phase rectifier filter circuit is connected with secondary windings of the three transformers to rectify and filter secondary currents output by the secondary windings of the three transformers respectively, and generate an output voltage accordingly.