SWITCHING POWER CONVERSION APPARATUS AND MULTI-LEVEL SWITCHING POWER CONVERTER CIRCUIT THEREIN
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United States of America Patent
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Issued Date -
Sep 5, 2019
app pub date -
Dec 14, 2018
filing date -
Mar 2, 2018
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Abstract
A switching power conversion apparatus includes: a multi-level power stage, a PWM control circuit, a multi-level driver circuit, a bootstrap capacitor control circuit and a driving power control circuit. The bootstrap capacitor control circuit includes bootstrap capacitor control switches. During a charging period, a bootstrap control signal controls the bootstrap capacitor control switches, to electrically connect a second bootstrap node to the ground voltage level, whereby the supply voltage charges the bootstrap capacitor via the bootstrap diode. During a pumping period, the bootstrap control signal controls the bootstrap capacitor control switches to electrically connect the second bootstrap node to one of the upper-gate nodes or the switching node, whereby the voltage of the first bootstrap node is pumped to a corresponding pumping voltage level.
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