Lossy SPICE Models Produce Realistic Averaged Simulations

摘要

Standard averaged converter models do not include the losses. Instead, they usually in-sert ideal elements, and calculations omit some voltage drops. This simplifies the analysis, yet alters the dc operating point and ac response. Figs. 1a and 1b depict a buck converter that includes losses attributed to: a) inductor wire resistance, Rlf, b) power switch R_(DS(ON)), R_(ON), and c) the diode forward drop, Vf, and its dynamic resistance Rd=dVf/dId@Id.