US 12,407,263 B2
Back-end energy storage isolation fly-back conversion apparatus
Wei-Chen Liang, Hsinchu (TW); and Pin Chang, Hsinchu (TW)
Assigned to WISETOP TECHNOLOGY CO., LTD., Hsinchu (TW)
Filed by WISETOP TECHNOLOGY CO., LTD., Hsinchu (TW)
Filed on Oct. 16, 2023, as Appl. No. 18/487,407.
Claims priority of application No. 111211441 (TW), filed on Oct. 20, 2022.
Prior Publication US 2024/0136933 A1, Apr. 25, 2024
Prior Publication US 2024/0235402 A9, Jul. 11, 2024
Int. Cl. H02M 3/335 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/33569 (2013.01) [H02M 3/01 (2021.05); H02M 3/33507 (2013.01); H02M 3/33571 (2021.05)] 9 Claims
OG exemplary drawing
 
1. Aback-end energy storage isolation fly-back conversion apparatus (10) comprising:
a return switch (Q1);
a driving switch (Q2) electrically connected to the return switch (Q1);
an energy storage capacitor (Cs) electrically connected to the return switch (Q1);
a transformer (T1) electrically connected to the return switch (Q1) and the driving switch (Q2), and the transformer (T1) comprising a primary-side winding (Lm) and a secondary-side first winding (102);
a resonant inductor (Lr) electrically connected to the primary-side winding (Lm);
a first rectifier (104) electrically connected to the secondary-side first winding (102);
an output capacitor (Cout) electrically connected to the first rectifier (104); and
a controller (116) electrically connected to the return switch (Q1) and the driving switch (Q2);
wherein the return switch (Q1) is turned on by the controller (116), so that the energy storage capacitor (Cs) is charged by a primary-side current (I1) flowing through the resonant inductor (Lr), the primary-side winding (Lm), and the return switch (Q1), and the secondary-side first winding (102) is powered by the primary-side current (I1); when the primary-side current (I1) becomes negative, the energy storage capacitor (Cs) discharges through the return switch (Q1) and the primary-side winding (Lm) and continuously supplies power to the secondary-side first winding (102).