Resonant Converter Switching Control for Light Source Overshoot Reduction
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Solution Overview
Problem
Existing converters for supplying pulsed power to light sources, such as LASER and LED sources, face challenges in achieving improved performance due to overshoot and inefficient transient behavior, which affect the lifetime and efficiency of these devices.
Innovation Solution
A resonant converter with a switching part and controlling part that adapts switching parameters, including time intervals, to reduce overshoot and enhance transient behavior by employing first and second switches in alternating modes and a third switch for delayed activation and deactivation, along with a filter for improved output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switching control is used in converters, then the converter can operate, but it produces overshoot and inefficient transient behavior
Solution Approach 1:
The controlling part pre-adapts switching parameters before the actual power delivery phase. By adjusting the switching parameter during initial cycles (first time interval) before full power output, the system prepares the resonant circuit to avoid overshoot while maintaining efficient transient response. This preliminary adaptation of switching timing prevents the harmful overshoot effect before it occurs.
2Reliability
If switching parameters are fixed, then the converter structure is simple, but the performance cannot be improved
Solution Approach 1:
The converter transitions from fixed switching parameters to dynamic adaptation. The controlling part continuously adjusts switching parameters (such as switching timing and duration) based on real-time operational conditions. This dynamic approach improves performance by optimizing transient behavior and reducing overshoot, while the adaptation logic remains integrated within the existing control structure to limit complexity increases.
3Object-generated harmful factors
If the first time interval is shortened to reduce overshoot, then the pulse overshoot is reduced, but the cycle duration may become inconsistent
Solution Approach 1:
Different time intervals within the switching cycle are optimized independently for their specific functions. The first time interval is shortened locally to reduce overshoot during the initial power buildup phase, while the second time interval is adjusted to ensure the overall cycle duration remains consistent. This localized optimization allows each phase to be tuned for its specific requirement without compromising overall cycle stability.
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 results in reduced overshoot and improved transient behavior, leading to enhanced performance and efficiency of the converter, with the ability to maintain constant power output and protect against false conditions and load failures.
Implementation Method 1
a resonant converter for supplying pulsed power to a light source
Implementation Method 2
The switching part comprises first and second switches, the first switch being in a first mode and the second switch being in a second mode during a first time interval of a cycle
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Converters (1) for supplying pulsed power to light sources (8) comprise switching parts (2) and controlling parts (3) for adapting switching parameters of the switching parts (2) for improving a performance. The switching part (2) may comprise first / second switches (41, 42) that are in first / second modes during a first time interval of a cycle and vice versa during a second time intervals of a cycle. A group of cycles results in a pulse of the pulsed power. A switching parameter such as the first time interval of a first cycle may be shortened to reduce overshoot. A switching parameter such as the second time interval of the first cycle may be shortened or lengthened. A switching parameter such as the second time interval of a last cycle may be lengthened or shortened to reduce overshoot. A third switch (93) for switching the light source (8) is activated and de-activated delayedly to improve transient behavior.