Single-Ended Primary Inductor SEPIC buck boost multi schematic Flyback Converter Transformer PFC Critical Conduction MDM Inductor Multi-Level PWL I

 https://www.simplistechnologies.com/documentation/simplis/simplis_mdm/topics/3_0_brief_pfc_inductor.htm

https://circuitdigest.com/electronic-circuits/single-ended-primary-inductor-sepic-converter-design-with-xl6009 

Electronics | Free Full-Text | Cascaded-like High-Step-Down Converter with Single Switch and Leakage Energy Recycling in Single-Stage Structure

https://encyclopedia.pub/entry/22366

Multiple-Output DC–DC Converters | Encyclopedia MDPI

https://link.springer.com/article/10.1007/s42835-020-00573-9

Increasing Efficiency and Power Factor for Power Supplies Using Parallel Flyback Converter

buck boost converter | TL494 buck boost | 12v to 0-30v 20A | 20A buck boost converter Tricks Of Ali

MPPT BUCK BOOST for solar and wind generation - YouTube

https://www.researchgate.net/figure/Mazzilli-ZVS-flyback-converter-circuit_fig1_316266642