Multi-Phase LLC Converter Control for Phase Power Balancing
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Solution Overview
Problem
Multi-phase LLC converters deliver significantly less power than their theoretical maximum due to power imbalances between phases, limiting their performance and efficiency.
Innovation Solution
A controller is introduced that includes a driver block for generating gate driver signals, an imbalance sensor block for detecting power imbalances, and an adjustment block for adjusting the control of power switches to balance the load between phases by modulating the duty cycle and phase delay of the converter bridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple converter bridges are arranged in parallel to increase power delivery, then the power output capacity is improved, but power imbalances between phases occur causing the actual delivered power to be much less than theoretical maximum
Solution Approach 1:
The controller incorporates an imbalance sensor block that continuously monitors power delivery from each converter bridge and feeds this information back to the adjustment block. This feedback mechanism enables real-time detection of power imbalances between phases, allowing the system to identify which bridge is delivering excessive power and which is under-delivering, thereby resolving the contradiction between increased power capacity and power balance reliability
Solution Approach 2:
The system dynamically adjusts the gate driver signals for each converter bridge based on real-time power imbalance conditions. The adjustment block modifies switching parameters such as duty cycle and timing for individual bridges, enabling the system to adapt its operation to maintain balanced power distribution across all phases while operating at high power output levels
2Productivity
If multi-phase converters operate without load balancing control, then device complexity is reduced, but productivity is limited due to underutilization of power delivery capacity
Solution Approach 1:
The controller is segmented into three distinct functional blocks: a driver block for generating gate signals, an imbalance sensor block for monitoring power delivery, and an adjustment block for correcting imbalances. This segmentation allows each block to perform its specific function efficiently, enabling sophisticated load balancing without requiring a completely complex redesign of the entire converter system
Solution Approach 2:
The controller acts as an intermediary between the multiple converter bridges and the power load, mediating power distribution by detecting imbalances and adjusting individual bridge outputs. This intermediary function enables the system to achieve high productivity through intelligent power management without requiring fundamental changes to the converter architecture
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 controller effectively balances the load between phases, allowing multi-phase converters to achieve higher power output and reliability by adjusting the gate driver signals and phase delay, thereby optimizing power delivery and reducing electromagnetic interference.
Implementation Method 1
LLC resonant converters are a type of high-frequency switching converter used in power electronics for converting electrical power. In an LLC resonant converter, there is typically an arrangement of two inductors (L) and one capacitor (C) and power switches arranged in a resonant circuit configuration. The resonant circuit allows for zero voltage and/or current switching of the switches in the converter, reducing switching losses and improving efficiency.
Data Source
AI summary
A controller (10) for controlling switching in a multiphase power converter (1) having a plurality of converter bridges (2a, 2b), each associated with a phase. The controller (10) includes a driver block (10a) for generating gate driver signals for controlling power switches (HS1-4, LS1-4) in each of the converter bridges (2a, 2b), an imbalance sensor block (10b) for identifying a power imbalance between the plurality of converter bridges (2a, 2b), and an adjustment block (10c) for adjusting the control of the power switches (HS1-4, LS1-4) in response to the detection of a power imbalance by modifying timing of the generated gate driver signals.