Transformer Converter Timing Control for Synchronized Switching
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Solution Overview
Problem
Converters experience delays and false detections in driving switching circuits, leading to unreliable performance when operating at switching frequencies lower than the resonant frequency, due to delayed generation of driving signals and false enablement of switching circuits on the secondary side.
Innovation Solution
A converter system with a transformer, first and second switching circuits, and a controller that generates synchronized driving signals for both sides, ensuring the second enabling period of the second driving signal aligns with the first driving signal's period, preventing short circuits and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the converter operates at a switching frequency lower than the resonant frequency, then the converter can achieve wider frequency adaptability, but the driving signal generation is delayed by at least one switching cycle and false detection occurs
Solution Approach 1:
The controller predicts the second driving signal based on the first driving signal of the same driving period in advance, before the actual switching cycle completes. This preliminary action allows the controller to prepare the next driving signal proactively, eliminating the delay that normally occurs after one complete switching cycle, and prevents false detection by using predictive timing rather than reactive detection.
2Speed
If the second driving signal is generated based on the first driving signal of the same driving period, then the driving response speed is improved, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions using the same first driving signal: it uses the first driving signal both for controlling the first switching circuit and as a basis for predicting the second driving signal. This multi-functional use of the first driving signal eliminates the need for separate sensing and timing circuits on the secondary side, achieving fast response without significantly increasing device complexity.
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 solution enables quick and accurate driving of the switching circuit, enhancing the converter's performance by synchronizing the second driving signal with the first, thus preventing faults and ensuring reliable operation across various frequency ranges.
Implementation Method 1
The transformer has a first side and a second side. The first switching circuit is coupled to the first side of the transformer, and is controlled by a first driving signal to transfer power to the transformer during a first enabling period.
Data Source
AI summary
A converter includes a transformer, a first switching circuit, a second switching circuit and a controller. The first switching circuit is coupled to a first side of the transformer, and is controlled by a first driving signal to transfer power to the transformer during a first enabling period. The second switching circuit is coupled to a secondary side of the transformer, and is controlled by a second driving signal to transfer power received from the transformer. The controller is configured to provide the first driving signal to the first switching circuit, to provide the second driving signal to the second switching circuit, generate the second driving signal according to the first driving signal of a same driving period, and enable a second enabling period of the second driving signal during the same driving period.