User`s guide

SMPS AC/DC Reference Design User’s Guide

3.2 STRUCTURE OF THE CONTROL SOFTWARE

The control software for the SMPS AC/DC Reference Design essentially follows a

single basic structure as shown in Figure 3-2.

FIGURE 3-2: FLOWCHART OF CONTROL SOFTWARE

The control software uses a mixture of C programming and Assembly programming. All

time-critical functions are written in Assembly language. The main loop, peripheral

setup routines, initialization routines and non-critical functions are all written using the

C programming language.

The SMPS AC/DC Reference Design comprises of two separate projects, namely:

• Primary: This project contains the complete code for the primary side of the

SMPS AC/DC Reference Design. This includes the control software for the PFC

Boost Converter and the Phase-Shift ZVT Converter.

• Secondary: This project contains the complete code for the secondary side of the

SMPS AC/DC Reference Design. This includes the control software for the

Single-Phase Buck Converter and Multi-Phase Buck Converter, and also includes

code for the ZVT output voltage measurement and digital voltage feedback.

All of the functional blocks shown in Figure 3-2 are common to both projects. Brief

descriptions of each functional block are provided in subsequent sections.

Initialization

Start

Idle Loop

(Normal Operation)

Enable Peripherals

Fault Present?

Fault Loop

ADC Interrupt

Yes

Soft-Start