US 12,244,226 B2
Voltage-balancing non-isolated high-step-down-ratio power supply
Keyao Sun, Blacksburg, VA (US); Rolando Burgos, Blacksburg, VA (US); and Dushan Boroyevich, Blacksburg, VA (US)
Assigned to VIRGINIA TECH INTELLECTUAL PROPERTIES, INC., Blacksburg, VA (US)
Filed by VIRGINIA TECH INTELLECTUAL PROPERTIES, INC., Blacksburg, VA (US)
Filed on Sep. 19, 2022, as Appl. No. 17/933,312.
Claims priority of provisional application 63/264,307, filed on Nov. 19, 2021.
Prior Publication US 2023/0369969 A1, Nov. 16, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/015 (2021.05) [H02M 1/0025 (2021.05); H02M 3/158 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A step-down power supply, comprising:
an input and an output;
a string of series-connected capacitors; and
a plurality of unidirectional balancing cells coupled to capacitors in the string of series-connected capacitors, wherein:
each balancing cell among the plurality of unidirectional balancing cells comprises a pair of switching transistors, a pair of diodes, and a balancing branch coupled between the pair of switching transistors and the pair of diodes;
the pair of switching transistors of a first balancing cell among the plurality of unidirectional balancing cells is coupled in parallel with a first capacitor of the string of series-connected capacitors; and
the pair of diodes of a second balancing cell among the plurality of unidirectional balancing cells is also coupled in parallel with the first capacitor of the string of series-connected capacitors.