Figure 3. Equivalent circuits for each operating interval of the proposed converter: (a):t0-t1, (b):t1-t2, (c):t2-t3, (d):t3-t4, (e):t4-t0, (The gray colored elements do not conduct current)

From

A New ZCS High Step-up DC-DC Converter

Majid Delshad, Nima rakian

International Transaction of Electrical and Computer Engineers System. 2013, 1(1), 1-5 doi:10.12691/iteces-1-1-1