S09 - Digital Power Control Introduction

Seminar Description: This presentation will introduce the audience to digital power control in switched mode power supplies (SMPS). The presentation will begin with showing the limitation of analog power control and then how to overcome those using micro-controller unit (MCU) based digital control along with its associated challenges. It will begin with explaining essential digital blocks for digital control including analog to digital converter (ADC), digital pulse width modulator (DPWM) and digital compensators. It will also present four different design examples to showcase those advantages and challenges in digital control. First, it will start with commonly known buck converter with voltage mode control (VMC). In the second example, it will showcase multimode operation of 4-switch buck-boost converter (FSBB) with peak current mode control (PCMC). In third example, we will showcase variable frequency control (VFC) using hybrid hysteretic control (HHC) of half bridge LLC (HB-LLC). In fourth and last example, it will showcase totem-pole bridgeless PFC (TPPFC) example to showcases average current mode control based dual loop implementation. While presenting these examples, we will show various challenges in specific topologies and MCU based methodologies to overcome those challenges.