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1. CHARACTERIZING THE DYNAMICS OF THE PEAK-CURRENT-
MODE-CONTROLLED BUCK POWER-STAGE
CONVERTER IN PHOTOVOLTAIC
APPLICATIONS
ABSTRACT:
This project investigates the dynamical properties and operational
constraints of a PCM-controlled buck-power-stage converter in the photovoltaic
(PV) applications. It has been already earlier noticed that the application of PCM
control can make the converter unstable in the PV applications. The investigations
reveal that the inductor-current feedback forces the open-loop converter to adopt
the dynamic properties of a voltage-fed converter, and consequently, the stable
operation is limited to the constant-voltage region of the PV generator. The
developed small-signal models reveal that a right-half-plane pole appears in the
converter dynamics, when the operation point enters into the constant-current
region leading to instability. The stability can be restored by heavily compensating
the inductor-current loop, which seriously removes the desired properties
materialized in the conventional buck converter.

2. BLOCK DIAGRAM:
Solar energy Battery PCM buck
TOOLS:
1. Orcad/pspice.
2. Pic controller.
converter
Output
Driver circuit
Pulse generate
unit
12v dc supply
5 v dc supply