Electrical circuit with auxiliary voltage source for zero-voltage switching in DC-DC converter under all load conditions
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United States of America
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Mar 31, 2020
Grant Date -
Jan 2, 2020
app pub date -
Jun 28, 2019
filing date -
Jun 28, 2019
priority date (Note) -
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Abstract
An electrical circuit comprising an n-port m-phase active bridge converter with n≥2 and m≥1, where each port can be operated as an input or an output port, wherein each of the n ports has m phase legs with multiple active switches with parallel connected snubber or resonant capacitors, whereby the n ports can convert a DC-voltage into an AC voltage, the n ports connected via an m-phase transformer or over m separate transformers each connected to each of the m phase legs of each of the n ports to transfer power between the ports, wherein an auxiliary circuit is connected to the transformers to convert a part of a transformer input voltage and energy via an auxiliary voltage source into a DC mid-point capacitor of a DC-link of at least one of the n-port m-phase active bridge converters to recharge the DC mid-point capacitor.
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