Mixed-signal adaptive primary side power control

Abstract

In the offline AC-DC power conversion there is a race to make the devices cheaper and more reliable. This trend makes researchers and engineers to look more and more for primary side regulation, as it makes the converter simpler, with less parts and, most importantly, it increases safety of operation through primary and secondary isolation. In this article an adaptable primary side power limiter is proposed and demonstrated. The flexibility of this design is employed to control a secondary side current control constant voltage load such as an LED. The system analysis is focused on the input voltage change rejection and digital linearity control.