Converter Device With Reverse-Coiled Transformer For Zero-Voltage Switching
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Solution Overview
Problem
Existing converter devices face challenges with high structural constraints and switching losses due to high switching speeds and currents, limiting the increase of switching frequency, and they often fail to achieve complete demagnetization of inductive means before main turn-off.
Innovation Solution
A unidirectional converter device with a transformer having reverse-coiled windings directly connected to the power supply input, featuring auxiliary switching means and power storage capacitors to establish current resonance and demagnetization, allowing for zero-voltage switching and reduced energy dissipation in transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high switching speeds are used to improve efficiency, then switching frequency can be increased, but switching losses and structural constraints increase
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor to the input voltage level before the main switching device turns on. This preliminary charging action ensures that when the main switch closes, there is no voltage difference across it, eliminating switching losses. The capacitor is charged through a separate charging circuit during the off-state of the main switch, preparing the system in advance to enable lossless switching.
Solution Approach 2:
The patent introduces a capacitor as an intermediary element between the power source and the main switching device. This capacitor acts as a buffer that absorbs and releases energy, isolating the main switch from voltage transients and switching stresses. By placing this intermediary capacitor in parallel with the main switch, the system achieves soft switching conditions without modifying the main switching device itself.
2Productivity
If high switching speeds are used, then efficiency improves, but structural constraints on switching components increase
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor to the input voltage level before the main switching device turns on. This preliminary charging action ensures that when the main switch closes, there is no voltage difference across it, eliminating switching losses. The capacitor is charged through a separate charging circuit during the off-state of the main switch, preparing the system in advance to enable lossless switching.
Solution Approach 2:
The patent introduces a capacitor as an intermediary element between the power source and the main switching device. This capacitor acts as a buffer that absorbs and releases energy, isolating the main switch from voltage transients and switching stresses. By placing this intermediary capacitor in parallel with the main switch, the system achieves soft switching conditions without modifying the main switching device itself.
3Reliability
If inductive means are used for current resonance, then zero-voltage switching is achieved, but complete demagnetization before turn-off is difficult
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor to the input voltage level before the main switching device turns on. This preliminary charging action ensures that when the main switch closes, there is no voltage difference across it, eliminating switching losses. The capacitor is charged through a separate charging circuit during the off-state of the main switch, preparing the system in advance to enable lossless switching.
Solution Approach 2:
The patent introduces a capacitor as an intermediary element between the power source and the main switching device. This capacitor acts as a buffer that absorbs and releases energy, isolating the main switch from voltage transients and switching stresses. By placing this intermediary capacitor in parallel with the main switch, the system achieves soft switching conditions without modifying the main switching device itself.
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 enables efficient zero-voltage switching, reduces switching losses, and ensures complete demagnetization of transformers, thereby improving the operational efficiency and reliability of converter devices.
Implementation Method 1
power storage means parallel-connected on the switching means to establish a resonance of current in the inductive means before main turn-on
Implementation Method 2
inductive means, input current branch-off means, and power storage means parallel-connected on the switching means to establish a resonance of current in the inductive means
Data Source
AI summary
A converter device comprising a power supply input, rectifier means, switching means, control means, and a switching aid circuit, said switching aid circuit comprising inductive means, branch-off means of an input current, and power storage means. The device of the invention is characterized in that the inductive means are essentially formed by a transformer directly connected to the power supply input and comprising reverse-coiled windings, and that the branch-off means comprise auxiliary switching means directly connected between said inductive means and a voltage reference or an output line to establish branch-off of the input current onto said inductive means before main turn-on.An uninterruptible power supply comprising the converter device described above.