Resonant Conversion Circuit Trajectory Control for Dynamic Stability
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Solution Overview
Problem
Conventional LLC resonant conversion circuits face limitations in dynamic performance due to non-linear relationships between output voltage and frequency, which restricts the stability and range of output voltage, especially in applications with fluctuating power sources like batteries or data centers.
Innovation Solution
A control method for a resonant conversion circuit that determines an operating trajectory with multiple segments, predicts end points based on current modes, and adjusts switching times to achieve desired output voltage ranges, enhancing dynamic response and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If closed-loop feedback mechanism with frequency control is used to widen output voltage range, then output voltage range is improved, but dynamic performance deteriorates due to non-linear relationship between output voltage and frequency
Solution Approach 1:
The operating trajectory is divided into N trajectory segments, with each segment having a determined operating mode. This segmentation allows the system to handle different voltage ranges with optimized control parameters, improving dynamic performance while maintaining wide output voltage range capability.
Solution Approach 2:
The control method dynamically determines operating modes and predicts trajectory segments based on real-time starting points. The system adapts its control strategy by calculating execution times for each trajectory segment, enabling dynamic response to load changes while maintaining stability across the wide output voltage range.
2Stability of the object's composition
If proportional and integral parameters are designed to enhance stability under different operating conditions, then stability is improved, but dynamic performance is severely limited
Solution Approach 1:
The system pre-determines operating modes for each trajectory segment based on starting points. By predicting the operating trajectory in advance and dividing it into segments with predetermined modes, the system prepares control strategies beforehand, enabling both stability and fast dynamic response without relying solely on PI parameter tuning.
Solution Approach 2:
The patent replaces traditional PI controller mechanics with a trajectory-based control approach. Instead of using proportional and integral parameters to regulate stability, the system uses predictive trajectory segmentation and execution time calculation, substituting the mechanical control system with a more advanced predictive control mechanism that achieves both stability and dynamic performance.
3Adaptability or versatility
If frequency is directly controlled to achieve wider output voltage range, then output voltage adaptability is improved, but the non-linear relationship causes control complexity to increase
Solution Approach 1:
The system changes the control parameter from direct frequency control to trajectory segment execution time control. By determining operating modes and calculating execution times for predefined trajectory segments, the method transforms the control approach to handle the non-linear relationship more effectively, reducing control complexity while maintaining wide output voltage range capability.
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 method improves the dynamic response and stability of the resonant conversion circuit, allowing for a wider output voltage range and better handling of power frequency fluctuations, thereby enhancing the circuit's performance in diverse applications.
Implementation Method 1
The resonant network includes a resonant capacitor Cr and a resonant inductor Lr
Data Source
AI summary
A control circuit for a resonant conversion circuit is provided. The resonant conversion circuit includes a switching circuit, a resonant network and a rectifier circuit. Firstly, a starting point of an operating trajectory with a plurality of trajectory segments is determined according to a sampling data sampled at a first switching time point. Then, the starting point of each trajectory segment is determined. The operating mode is determined according to the starting point of the corresponding trajectory segment, and a curve and an end point of the trajectory segment are predicted according to the operating mode. Then, the duration time of each trajectory segment is calculated. The end point of the operating trajectory is determined according to a control instruction. According to the execution time between the starting point and the end point of the operating trajectory, a next switching time point is controlled.