User`s guide

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SMPS AC/DC REFERENCE

DESIGN USER’S GUIDE

Chapter 4. System Operation

This chapter describes the system setup and operation of the SMPS AC/DC Reference

Design.

4.1 SYSTEM SETUP

4.1.1 Recommended Test Equipment

The following list of test equipment is recommended for complete evaluation of the

SMPS AC/DC Reference Design and/or development of software.

• Oscilloscope

• High Voltage Probe (100:1 attenuation ratio) or Differential Probe

• 10A AC Current Probe

• Power Quality Meter

• DC Electronic Load (350W or higher, and should have capability to load at least

two outputs simultaneously)

• 0V-265V Variac or Programmable AC Source (500W or higher)

• Two Digital Multimeters

4.1.2 Functional Blocks of the System

Figure 4-1 shows a block diagram of the SMPS AC/DC Reference Design. Table 4-1

describes the inputs and outputs of the system and also displays the location of the

isolation barrier. To assist in identifying each functional block on the SMPS AC/DC

Reference Design, Figure 4-2 shows a top-view of the system with each block called

out with dotted lines.

FIGURE 4-1: SMPS AC/DC REFERENCE DESIGN BLOCK DIAGRAM

85-265 VAC

45-65 Hz

EMI Filter

and Bridge

Rectifier

PFC

Boost

Converter

ZVT

Full-Bridge

Converter

Synchronous

Rectifier

Optocoupler

3.3 VDC

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