Resonant Converter Voltage Equalization via Adaptive Frequency Control
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Solution Overview
Problem
Existing power conversion devices with multiple resonant converter circuits in series face voltage unbalance issues due to electrical component tolerance and load transients, leading to potential component damage and difficulties in designing electromagnetic interference suppression circuits.
Innovation Solution
A power conversion device comprising multiple resonant converter circuits, a controller, a frequency processing circuit, and a signal modulation circuit that generates switching frequencies based on voltage differences to balance output voltages and control switching elements, ensuring equal output voltages across all circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent control of each resonant converter circuit is implemented, then output voltage control flexibility is improved, but switching frequency difference increases making EMI suppression circuit design difficult
Solution Approach 1:
The patent applies local quality by allowing each resonant converter circuit to have its own switching frequency adjustment based on its specific voltage deviation, while maintaining overall system coordination. Each converter's switching frequency is independently tuned according to its local voltage error, enabling flexible voltage control without requiring complex centralized EMI suppression circuits.
2Ease of operation
If same control signals are generated to each resonant converter circuit, then control simplicity is improved, but voltage unbalance occurs due to component tolerance and load transient
Solution Approach 1:
The patent implements dynamics by transitioning from static identical control signals to dynamic adaptive control signals. Each resonant converter circuit's switching frequency is dynamically adjusted based on real-time voltage feedback and its specific deviation from the reference voltage, enabling the system to adapt to component tolerances and load transients while maintaining voltage balance.
Solution Approach 2:
The patent applies feedback by monitoring the output voltage of each resonant converter circuit and using the voltage deviation as feedback to adjust the switching frequency. The controller continuously compares each converter's output voltage with the reference voltage and modifies the switching frequency accordingly, creating a closed-loop control system that maintains voltage balance despite component variations and load changes.
3Reliability
If switching frequency is adjusted to balance voltages, then voltage balance is improved, but control complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the switching frequency parameter of each resonant converter circuit to achieve voltage balance. Instead of modifying complex control algorithms or adding numerous control circuits, the solution changes the switching frequency parameter based on voltage deviation, providing a simple yet effective method to improve voltage balance while minimizing control complexity.
Data Source
AI summary
A control method includes the following operations: combining multiple output voltages into a total output voltage; generating a first switching frequency based on a first voltage difference, and generating at least one offset frequency based on at least one second voltage difference; generating at least one second switching frequency according to the at least one offset frequency and the first switching frequency; and generating a first set of switching signals according to the first switching frequency, and generating at least one second set of switching signals according to the at least one second switching frequency to respectively control a switching element of the resonant converter circuits.