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SMPS AC/DC REFERENCE

DESIGN USER’S GUIDE

Chapter 3. Software Design

3.1 OVERVIEW

The SMPS AC/DC Reference Design is controlled using two dsPIC DSCs as shown in

the block diagram in Figure 3-1.

The dsPIC DSC on the primary side (on the left of the isolation barrier in Figure 3-1)

controls the PFC Boost Converter and the Phase-Shift ZVT Converter. The dsPIC DSC

on the secondary side (on the right of the isolation barrier in Figure 3-1) controls the

Multi-Phase Buck Converter and the Single-Phase Buck Converter.

The secondary side dsPIC DSC also performs the function of measuring the output

voltage of the Phase-Shift ZVT Converter, and feeding back to the primary side dsPIC

DSC as a digital feedback signal.

FIGURE 3-1: BLOCK DIAGRAM OF SMPS AC/DC REFERENCE DESIGN

Note: Any libraries and source files associated with SMPS AC/DC Reference

Design are available by request from your local Microchip sales office. See

the Microchip Web site, or the last page of this document for contact

information.

85-265 VAC

45-65 Hz

EMI Filter

and Bridge

Rectifier

PFC

Boost

Converter

ZVT

Full-Bridge

Converter

Synchronous

Rectifier

Opto-

Coupler

3.3 V

69A

5 V

23A

Isolation

Barrier

420 V

Rectified

Sinusoidal

Voltage

Multi-Phase

Buck Converter

Single-Phase

Buck Converter

Phase-Shift ZVT Converter

dsPIC33FJ16GS504

12 VDC

30A

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 117 118

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