Back-end energy storage isolation fly-back conversion apparatus

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).