Equation (10) defines the periodic nonlinear carrier waveform
in the NLC controller of Fig. 1. Operation of the
controller is illustrated by the waveforms of Fig. 2. Note that
the ideal waveform is not realizable because
, but can simply be clamped at the beginning of a
switching period. With the nonlinear-carrier waveform defined
by (10), the required current shaping (3) can also be expressed
as
(11)
A. Current Distortion in the DCM
The basic assumption in the derivation of the NLC controller
is that the converter operates in the CCM. In the DCM, the
relation (5) is not valid, and the resulting input current does not
exactly follow the input voltage. The purpose of this section
is to determine conditions for operation in the CCM and to