CAPACITOR VOLTAGE BALANCING TECHNIQUES FOR MULTI-LEVEL DUAL ACTIVE BRIDGE CONVERTER
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United States of America
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Mar 20, 2025
app pub date -
Sep 15, 2023
filing date -
Sep 15, 2023
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Abstract
Capacitor voltage balancing techniques are described for a 3-level 3-level dual-active-bridge converter that controls the duration of a zero voltage state of the low voltage (LV) and medium (MV) side transformer voltages based on a voltage difference between the upper and lower capacitors of both the LV and MV sides independently, the power delivered (P), and the LV and MV DC voltages. This control varies the angle to maintain the power requirement, which induces the additional voltage drop across the transformer inductance to produce the required current to flow through the capacitors and balance the capacitor voltages.
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